ORION SATELLITE CORP
S-1/A, 1997-01-23
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 22, 1997
                                                      REGISTRATION NO. 333-19167
================================================================================
    
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                 AMENDMENT NO. 2
                                       TO
                                    FORM S-1

                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                          ORION NETWORK SYSTEMS, INC.*
             (Exact name of registrant as specified in its charter)

<TABLE>
<CAPTION>
<S>                           <C>                               <C>
        Delaware                          4899                               52-2008654
(State of organization)       (Primary S.I.C. Code Number)    (I.R.S. Employer & Identification Number)
</TABLE>

 2440 RESEARCH BOULEVARD, SUITE 400, ROCKVILLE, MARYLAND 20850, (301) 258-8101
    (Address, including zip code, and telephone number, including area code,
                  of Registrant's principal executive offices)

                              RICHARD H. SHAY, ESQ.
 2440 RESEARCH BOULEVARD, SUITE 400, ROCKVILLE, MARYLAND 20850, (301) 258-8101
    (Name, address, including zip code, and telephone number, including area
                           code, of agent for service)

   For Information regarding additional registrants, see "Table of Additional
                                  Registrants."

                                    Copies to:
<TABLE>
<CAPTION>
<S>                                                   <C>                        <C>
                 Anthony S. Harrington, Esq.                            Jerry V. Elliott, Esq.
                   Steven M. Kaufman, Esq.                            James S. Scott, Sr., Esq.
                   HOGAN & HARTSON L.L.P.                                 SHEARMAN & STERLING
  555 Thirteenth Street, N.W., Washington, D.C. 20004-1109    599 Lexington Avenue, New York, New York 10022
                       (202) 637-5600                                       (212) 848-4000
</TABLE>

   Approximate  date of commencement of proposed sale to the public:  As soon as
practicable after the Registration Statement becomes effective.

   If any of the securities being registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, as amended, check the following box: [   ]

   If this  Form is filed to  register  additional  securities  for an  offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  number  of the  earlier  effective
registration statement for the same offering. [    ]

   If this Form is a  post-effective  amendment  filed  pursuant  to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [   ]

   If delivery of this  prospectus  is expected to be made pursuant to Rule 434,
please check the following box. [ ]

   THE  REGISTRANT  HEREBY  AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE  SECURITIES  ACT OF 1933, AS AMENDED,  OR UNTIL THE  REGISTRATION  STATEMENT
SHALL BECOME  EFFECTIVE ON SUCH DATE AS THE COMMISSION,  ACTING PURSUANT TO SAID
SECTION 8(a), MAY DETERMINE.


<PAGE>
   
                                EXPLANATORY NOTE

   This  Amendment  is being  filed  for the  purposes  of filing  the  exhibits
indicated in Part II of the Registration  Statement.  The Amendment also refiles
page 70 of the Registration  Statement to correct certain  references to Exhibit
99.2 hereto.
    


<PAGE>



accurate way to value Orion 1 would be to identify  recent,  closely  comparable
sales of transponders or satellites serving similar markets.  Ascent did not use
this  method  since it was unable to  identify  any  closely  comparable  sales.
However, Ascent's did identify the most comparable satellite sales as a check on
approach in appraising Orion 1.
   
   Because events and circumstances  frequently do not occur as expected and for
the reasons  described  under "Risk  Factors" and elsewhere in this  Prospectus,
there will usually be differences between assumed and actual results,  and those
differences  may be  material.  Therefore,  no  assurance  may be given that the
appraised value of Orion 1 will be achieved and reliance should not be placed on
such appraised  value.  

   The Company has obtained an appraisal  from Ascent  because it believes  that
the value of Orion 1 may be of interest to  purchasers of the Notes as creditors
of the  Company,  and that  such  purchasers  might be  interested  in an expert
appraiser's assessment of the value of Orion 1.

 INSURANCE
    

   Orion has obtained satellite in-orbit life insurance for Orion 1 covering the
period  from May 1996 to May 1997 in an  initial  amount of  approximately  $245
million  providing  protection  against partial or total loss of the satellite's
communications capability,  including loss of transponders,  power or ability to
control the  positioning  of the satellite.  The aggregate  premium for in-orbit
insurance for Orion 1 is approximately $6 million per annum.

   Orion intends to procure launch  insurance for the  construction,  launch and
insurance costs of Orion 2 and Orion 3. In the past,  satellite launch insurance
was generally procured  approximately six months prior to launch.  Recently,  it
has become  possible to obtain a commitment  from  insurance  underwriters  well
before that time,  which fixes the rate and certain  terms of launch  insurance.
Orion intends shortly to seek such a commitment  from insurance  underwriters to
provide launch  insurance for Orion 2 and Orion 3. Such insurance is expected to
be quite  costly,  with present  insurance  rates ranging at or above 16% of the
insured  amount,  depending  upon such factors as the launch  history and recent
performance of the launch vehicle to be used and general  availability of launch
insurance in the insurance  marketplace (although such rates have reached 20% or
higher in the past several  years).  Such  insurance  can be expected to include
certain contract terms,  exclusions,  deductibles and material change conditions
that are  customary  in the  industry.  After launch of Orion 2 and Orion 3, the
Company will need to procure  satellite  in-orbit life insurance for Orion 2 and
Orion 3. There can be no assurance that such insurance will be available or that
the price of such insurance or the terms and exclusions in the actual  insurance
policies will be favorable to the Company. Launch and in-orbit insurance for its
satellites will not protect the Company against business  interruption,  loss or
delay of revenues and similar losses and may not fully reimburse the Company for
its expenditures.  Accordingly,  an unsuccessful launch of Orion 2 or Orion 3 or
any significant  loss of performance with respect to any of its satellites would
have a material  adverse  effect on Orion and would  impair  Orion's  ability to
service its  indebtedness,  including  the Notes.  See "Risk Factors -- Risks of
Satellite Loss or Reduced  Performance -- Limited Insurance for Satellite Launch
and Operation."

COMPETITION

   As a  provider  of  data  networking  and  Internet-related  services,  Orion
competes  with a  large  number  of  telecommunications  service  providers  and
value-added  resellers  of  transmission  capacity.  As a provider of  satellite
transmission  capacity,  Orion  competes  with other  providers of satellite and
terrestrial facilities.

   Many of these competitors have significant competitive advantages,  including
long-standing  customer  relationships,  close  ties with  regulatory  and local
authorities,  control  over  connections  to local  telephone  networks and have
financial resources, experience, marketing capabilities and name recogni


                                70

<PAGE>




                                   PART II
                    INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13. Other Expenses of Issuance and Distribution.

   The  following  table  sets  forth  the  various  expenses  to be paid by the
Registrant in connection with the sale and  distribution of the securities being
registered  hereby,  other than  underwriting  discounts  and  commissions.  All
amounts are estimated except the Securities and Exchange Commission registration
fee and the National Association of Securities Dealers, Inc.
filing and listing fees.

Securities and Exchange Commission registration fee ......  $105,152
National Association of Securities Dealers, Inc. filing
fee.......................................................  $ 30,500
Blue sky fees and expenses (including fees of counsel) ...         *
Printing and engraving expenses...........................         *
Fees and expenses of counsel for the Company..............         *
Accounting fees and expenses..............................         *
Appraisal fees and expenses...............................         *
Transfer agent and registrar fees.........................         *
Miscellaneous.............................................         *
 Total....................................................  $      *
                                                            ===========

- ----------
*    To be filed by amendment.

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

   Orion. Orion's Certificate of Incorporation  provides that its directors will
not be liable for monetary  damages for breach of the directors'  fiduciary duty
of care to the Company and its  stockholders.  This provision in the Certificate
of  Incorporation  does  not  eliminate  the duty of  care,  and in  appropriate
circumstances  equitable  remedies  such as an  injunction  or  other  forms  of
non-monetary  relief would remain  available  under  Delaware law. In accordance
with  the  requirements  of  Delaware  law,  as  amended,   the  Certificate  of
Incorporation  provide that the  Company=s  directors  would  remain  subject to
liability  for  monetary  damages (i) for any breach of their duty of loyalty to
the  corporation  or its  shareholders,  (ii) for acts or omissions  not in good
faith or involving  intentional  misconduct or knowing  violation of law,  (iii)
under Section 174 of the Delaware  Code for approval of an unlawful  dividend or
an unlawful stock purchase or redemption and (iv) for any transaction from which
the director derived an improper personal benefit.  This provision also does not
affect a director's  responsibilities  under any other laws, such as the federal
securities laws or state or federal environmental laws.

   Orion's  Certificate of Incorporation also provides that, except as expressly
prohibited  by law,  Orion shall  indemnify any person who was or is a party (or
threatened to be made a party) to any threatened,  pending or completed  action,
suit or  proceeding  by reason of the fact that such person is or was a director
or officer of Orion (or is or was  serving at the request of Orion as a director
or officer of another  enterprise),  against  expenses,  liabilities  and losses
(including attorney's fees), judgments,  fines and amounts paid or to be paid in
settlement  actually and reasonably  incurred by such person in connection  with
such action,  suit or proceeding if such person acted in good faith and a manner
such person reasonably believed to be in or not opposed to the best interests of
Orion, and, with respect to any criminal action or proceeding, had no reasonable
cause to believe his or her conduct was unlawful. Such indemnification shall not
be made in respect of any claim,  issue or matter as to which such person  shall
have been  adjudged to be liable to Orion  unless (and only to the extent  that)
the  Delaware  Court of  Chancery  or the court in which such action or suit was
brought  determines that, in view of all  circumstances of the case, such person
is fairly and reasonably entitled to indemnity.

   Old ONSI. Old ONSI's Certificate of Incorporation provides that its directors
will not be liable for monetary  damages for breach of the directors'  fiduciary
duty of care to Old ONSI and its stockholders. This provision in the Certificate
of Incorporation does not eliminate the duty of care, and in appropriate

                              II-1

<PAGE>
                                   PART II
              INFORMATION NOT REQUIRED IN PROSPECTUS (Continued)

circumstances  equitable  remedies  such as an  injunction  or  other  forms  of
non-monetary  relief would remain  available  under  Delaware law. In accordance
with  the  requirements  of  Delaware  law,  as  amended,   the  Certificate  of
Incorporation  provide  that  Old  ONSI's  directors  would  remain  subject  to
liability  for  monetary  damages (i) for any breach of their duty of loyalty to
the  corporation  or its  shareholders,  (ii) for acts or omissions  not in good
faith or involving  intentional  misconduct or knowing  violation of law,  (iii)
under Section 174 of the Delaware  Code for approval of an unlawful  dividend or
an unlawful stock purchase or redemption and (iv) for any transaction from which
the director derived an improper personal benefit.  This provision also does not
affect a director's  responsibilities  under any other laws, such as the federal
securities laws or state or federal environmental laws.

   Old  ONSI's  Certificate  of  Incorporation  also  provides  that,  except as
expressly prohibited by law, Old ONSI shall indemnify any person who was or is a
party (or threatened to be made a party) to any threatened, pending or completed
action,  suit or  proceeding  by reason of the fact that such person is or was a
director or officer of Old ONSI (or is or was serving at the request of Old ONSI
as a  director,  officer,  employee  or agent of  another  enterprise),  against
expenses,  liabilities and losses (including attorney's fees), judgments,  fines
and amounts paid or to be paid in settlement actually and reasonably incurred by
such person in connection with such action, suit or proceeding.

   OrionSat. OrionSat's Certificate of Incorporation provides that its directors
will not be liable for monetary  damages for breach of the directors'  fiduciary
duty of care to OrionSat and its stockholders. This provision in the Certificate
of  Incorporation  does  not  eliminate  the duty of  care,  and in  appropriate
circumstances  equitable  remedies  such as an  injunction  or  other  forms  of
non-monetary  relief would remain  available  under  Delaware law. In accordance
with  the  requirements  of  Delaware  law,  as  amended,   the  Certificate  of
Incorporation  provides  that  OrionSat's  directors  would  remain  subject  to
liability  for  monetary  damages (i) for any breach of their duty of loyalty to
the  corporation  or its  shareholders,  (ii) for acts or omissions  not in good
faith or involving  intentional  misconduct or knowing  violation of law,  (iii)
under Section 174 of the Delaware  Code for approval of an unlawful  dividend or
an unlawful stock purchase or redemption and (iv) for any transaction from which
the director derived an improper personal benefit.  This provision also does not
affect a director's  responsibilities  under any other laws, such as the federal
securities laws or state or federal environmental laws.

   OrionSat's  Bylaws  provide  that,  except as  expressly  prohibited  by law,
OrionSat  shall  indemnify any person who was or is a party (or threatened to be
made a party) to any threatened, pending or completed action, suit or proceeding
by reason of the fact that such person is or was a director,  officer,  employee
or agent of OrionSat (or is or was serving any other  enterprise  at the request
of OrionSat),  against expenses,  liabilities and losses  (including  attorney's
fees),  judgments,  fines and amounts paid or to be paid in settlement  actually
and reasonably  incurred by such person in connection with such action,  suit or
proceeding.

   OrionNet Finance Corporation.  OrionNet Finance Corporation's  Certificate of
Incorporation  provides  that its  directors  will not be  liable  for  monetary
damages for breach of the directors'  fiduciary duty of care to OrionNet Finance
Corporation  and  its  stockholders.   This  provision  in  the  Certificate  of
Incorporation   does  not  eliminate  the  duty  of  care,  and  in  appropriate
circumstances  equitable  remedies  such as an  injunction  or  other  forms  of
non-monetary  relief would remain  available  under  Delaware law. In accordance
with  the  requirements  of  Delaware  law,  as  amended,   the  Certificate  of
Incorporation  provides  that OrionNet  Finance  Corporation's  directors  would
remain  subject to liability  for  monetary  damages (i) for any breach of their
duty of  loyalty  to the  corporation  or its  shareholders,  (ii)  for  acts or
omissions  not in good  faith or  involving  intentional  misconduct  or knowing
violation of law,  (iii) under  Section 174 of the Delaware Code for approval of
an unlawful  dividend or an unlawful  stock  purchase or redemption and (iv) for
any transaction  from which the director derived an improper  personal  benefit.
This  provision  also does not affect a  director's  responsibilities  under any
other  laws,   such  as  the  federal   securities  laws  or  state  or  federal
environmental laws.

   OrionNet  Finance  Corporation's  Bylaws  provide  that,  except as expressly
prohibited by law,  OrionNet Finance  Corporation shall indemnify any person who
was or is a party (or threatened to be made a party) to any threatened,  pending
or completed action, suit or proceeding by reason of the fact

                              II-2

<PAGE>
                                   PART II
              INFORMATION NOT REQUIRED IN PROSPECTUS (Continued)

that such  person is or was a director,  officer,  employee or agent of OrionNet
Finance Corporation (or is or was serving any other enterprise at the request of
OrionNet  Finance  Corporation),   against  expenses,   liabilities  and  losses
(including attorney's fees), judgments,  fines and amounts paid or to be paid in
settlement  actually and reasonably  incurred by such person in connection  with
such action, suit or proceeding.

   Asia Pacific Space and Communications,  Ltd. ("APSC").  APSC's Certificate of
Incorporation  provides that the personal  liability of its  directors  shall be
eliminated  to the fullest  extent  provided by Section 7 of  Subsection  (b) of
Section 102 of the Delaware Code.  This paragraph  allows for the elimination of
all personal  liability,  provided  that  liability  shall not be  eliminated or
limited  (i) for any breach of their duty of loyalty to the  corporation  or its
shareholders,  (ii)  for  acts or  omissions  not in  good  faith  or  involving
intentional  misconduct or knowing  violation of law, (iii) under Section 174 of
the  Delaware  Code for  approval of an unlawful  dividend or an unlawful  stock
purchase or  redemption  and (iv) for any  transaction  from which the  director
derived an improper  personal  benefit.  This  provision in the  Certificate  of
Incorporation   does  not  eliminate  the  duty  of  care,  and  in  appropriate
circumstances  equitable  remedies  such as an  injunction  or  other  forms  of
non-monetary  relief would remain  available  under Delaware law. This provision
also does not affect a director's responsibilities under any other laws, such as
the federal securities laws or state or federal environmental laws.

   APSC's  Certificate of Incorporation  also provides that APSC shall indemnify
its directors, officers, employees and agents to the fullest extent permitted by
Section  145 of the  Delaware  Code,  as the same  exists  or may  hereafter  be
amended.   Section  145  currently  covers  expenses,   liabilities  and  losses
(including attorney's fees), judgments,  fines and amounts paid or to be paid in
settlement  actually and reasonably  incurred by such person in connection  with
such action,  suit or proceeding if such person acted in good faith and a manner
such person reasonably believed to be in or not opposed to the best interests of
APSC, and, with respect to any criminal action or proceeding,  had no reasonable
cause to believe his or her conduct was unlawful. Such indemnification shall not
be made in respect of any claim,  issue or matter as to which such person  shall
have been adjudged to be liable to APSC unless (and only to the extent that) the
Delaware Court of Chancery or the court in which such action or suit was brought
determines that, in view of all circumstances of the case, such person is fairly
and reasonably entitled to indemnity.

   Orion  Asia  Pacific.  Orion  Asia  Pacific's  Certificate  of  Incorporation
provides that its directors  will not be liable for monetary  damages for breach
of the  directors'  fiduciary  duty  of  care  to  Orion  Asia  Pacific  and its
stockholders.  This  provision  in the  Certificate  of  Incorporation  does not
eliminate the duty of care, and in appropriate  circumstances equitable remedies
such as an  injunction  or  other  forms of  non-monetary  relief  would  remain
available  under Delaware law. In accordance  with the  requirements of Delaware
law, as amended,  the  Certificate  of  Incorporation  provides  that Orion Asia
Pacific=s  directors would remain subject to liability for monetary  damages (i)
for any breach of their duty of loyalty to the corporation or its  shareholders,
(ii) for acts or omissions not in good faith or involving intentional misconduct
or knowing  violation of law,  (iii) under  Section 174 of the Delaware Code for
approval of an unlawful dividend or an unlawful stock purchase or redemption and
(iv) for any transaction  from which the director  derived an improper  personal
benefit. This provision also does not affect a director's responsibilities under
any  other  laws,  such as the  federal  securities  laws or  state  or  federal
environmental laws.

   Orion Asia Pacific's Bylaws provide that,  except as expressly  prohibited by
law,  Orion Asia Pacific  shall  indemnify  any person who was or is a party (or
threatened to be made a party) to any threatened,  pending or completed  action,
suit or  proceeding by reason of the fact that such person is or was a director,
officer, employee or agent of Orion Asia Pacific (or is or was serving any other
enterprise at the request of Orion Asia Pacific), against expenses,  liabilities
and losses (including attorney's fees), judgments,  fines and amounts paid or to
be paid in  settlement  actually  and  reasonably  incurred  by such  person  in
connection with such action, suit or proceeding.

   OrionNet. OrionNet's Certificate of Incorporation provides that its directors
will not be liable for monetary  damages for breach of the directors'  fiduciary
duty of care to OrionNet and its stockholders. This provision in the Certificate
of Incorporation does not eliminate the duty of care, and in appropriate

                              II-3

<PAGE>
                                   PART II
              INFORMATION NOT REQUIRED IN PROSPECTUS (Continued)

circumstances  equitable  remedies  such as an  injunction  or  other  forms  of
non-monetary  relief would remain  available  under  Delaware law. In accordance
with  the  requirements  of  Delaware  law,  as  amended,   the  Certificate  of
Incorporation  provides  that  OrionNet's  directors  would  remain  subject  to
liability  for  monetary  damages (i) for any breach of their duty of loyalty to
the  corporation  or its  shareholders,  (ii) for acts or omissions  not in good
faith or involving  intentional  misconduct or knowing  violation of law,  (iii)
under Section 174 of the Delaware  Code for approval of an unlawful  dividend or
an unlawful stock purchase or redemption and (iv) for any transaction from which
the director derived an improper personal benefit.  This provision also does not
affect a director's  responsibilities  under any other laws, such as the federal
securities laws or state or federal environmental laws.

   OrionNet's  Bylaws  provide  that,  except as  expressly  prohibited  by law,
OrionNet  shall  indemnify any person who was or is a party (or threatened to be
made a party) to any threatened, pending or completed action, suit or proceeding
by reason of the fact that such person is or was a director,  officer,  employee
or agent of OrionNet (or is or was serving any other  enterprise  at the request
of OrionNet),  against expenses,  liabilities and losses  (including  attorney's
fees),  judgments,  fines and amounts paid or to be paid in settlement  actually
and reasonably  incurred by such person in connection with such action,  suit or
proceeding.

   Orion Atlantic  Europe,  Inc. Orion Atlantic  Europe,  Inc.'s  Certificate of
Incorporation  provides  that its  directors  will not be  liable  for  monetary
damages for breach of the  directors'  fiduciary  duty of care to Orion Atlantic
Europe,  Inc.  and  its  stockholders.  This  provision  in the  Certificate  of
Incorporation   does  not  eliminate  the  duty  of  care,  and  in  appropriate
circumstances  equitable  remedies  such as an  injunction  or  other  forms  of
non-monetary  relief would remain  available  under  Delaware law. In accordance
with  the  requirements  of  Delaware  law,  as  amended,   the  Certificate  of
Incorporation provides that Orion Atlantic Europe, Inc.'s directors would remain
subject to liability  for  monetary  damages (i) for any breach of their duty of
loyalty to the corporation or its  shareholders,  (ii) for acts or omissions not
in good faith or involving  intentional  misconduct or knowing violation of law,
(iii)  under  Section  174 of the  Delaware  Code for  approval  of an  unlawful
dividend  or  an  unlawful  stock  purchase  or  redemption  and  (iv)  for  any
transaction from which the director derived an improper personal  benefit.  This
provision  also does not affect a  director's  responsibilities  under any other
laws,  such as the  federal  securities  laws or state or federal  environmental
laws.

   Orion Atlantic  Europe,  Inc.'s  Certificate of  Incorporation  also provides
that, except as expressly  prohibited by law, Orion Atlantic Europe,  Inc. shall
indemnify any person who was or is a party (or threatened to be made a party) to
any threatened, pending or completed action, suit or proceeding by reason of the
fact that such person is or was a director or officer of Orion Atlantic  Europe,
Inc. (or is or was serving at the request of Orion  Atlantic  Europe,  Inc. as a
director or officer of another  enterprise),  against expenses,  liabilities and
losses (including attorney's fees),  judgments,  fines and amounts paid or to be
paid in settlement actually and reasonably incurred by such person in connection
with such action, suit or proceeding.

   Section 145 of the Delaware Code empowers a  corporation  incorporated  under
that statute to indemnify its directors,  officers, employees and agents and its
former  directors,  officers,  employees  and agents and those who serve in such
capacities with another  enterprise at its request against expenses,  as well as
judgments,  fines  and  settlements  in  nonderivative  lawsuits,  actually  and
reasonably  incurred by them in connection with the defense of any action,  suit
or  proceeding  in which  they or any of them  were or are made  parties  or are
threatened  to be made  parties by reason of their  serving or having  served in
such  capacity.  The power to  indemnify  shall only exist  where such  officer,
director,  employee or agent has acted in good faith and in a manner such person
reasonably  believed  to be in or not  opposed  to  the  best  interests  of the
corporation  and,  in the case of a criminal  action,  where such  person had no
reasonable cause to believe his conduct was unlawful.  However,  in an action or
suit by or in the right of the  corporation,  unless a court shall  determine to
the contrary,  where such a person has been adjudged liable to the  corporation,
the corporation shall have no power of  indemnification.  Indemnity is mandatory
to the  extent  a  claim,  issue  or  matter  has  been  successfully  defended.
Indemnification  is not  deemed  exclusive  of any other  rights to which  those
indemnified may be entitled, under any by-law,  agreement,  vote of stockholders
or otherwise. A Delaware corporation also has the power to purchase and maintain

                              II-4

<PAGE>
                                   PART II
              INFORMATION NOT REQUIRED IN PROSPECTUS (Continued)

insurance on behalf of the persons it has the power to indemnify, whether or not
indemnity against such liability would be allowed under the statute.

   International  Private Satellite Partners,  L.P. ("IPSP").  The Third Amended
and Restated Agreement of Limited Partnership of International Private Satellite
Partners,  L.P.  (the "IPSP  Partnership  Agreement")  provides that neither the
general  partner  (OrionSat)  nor  any of its  affiliates  ,  nor  any of  their
respective partners, officers,  directors,  employees or agents, shall be liable
to IPSP or its limited partners for any losses sustained or liabilities incurred
as a result of any act or omission,  so long as such conduct does not constitute
bad  faith,  fraud,  gross  negligence,  willful  misconduct  or  breach  of any
fiduciary duty.

   The IPSP  Partnership  Agreement  also  provides  that,  except as  expressly
prohibited by law,  IPSP shall  indemnify  OrionSat,  its  affiliates  and their
respective partners, officers, directors,  employees and agents from any and all
expenses,  liabilities and losses (including attorney's fees), judgments,  fines
and amounts paid or to be paid in settlement  arising from any claims,  demands,
actions,  suits or proceedings,  arising out of or incidental to the business or
activities relating to IPSP.

   Insofar as indemnification  for liabilities  arising under the Securities Act
of 1933,  as amended (the  "Securities  Act"),  may be  permitted to  directors,
officers and controlling persons of Orion pursuant to the foregoing provision or
otherwise,  Orion has been advised  that, in the opinion of the  Securities  and
Exchange Commission,  such indemnification is against public policy as expressed
in the Securities Act and therefore unenforceable. In the event that a claim for
indemnification   against  such  liabilities  is  asserted  by  such  person  in
connection  with the offering of the  Securities  (other than for the payment by
the  corporation  of  expenses  incurred  or  paid  by a  director,  officer  or
controlling  person of the corporation in the successful  defense of any action,
suit or proceeding),  the either  corporation will, unless in the opinion of its
counsel the matter has been settled by controlling precedent,  submit to a court
of appropriate  jurisdiction the question of whether such  indemnification by it
is against public policy as expressed in the Securities Act and will be governed
by the final adjudication of the issue.

   Orion has insurance policies which will insure directors and officers against
damages from actions and claims  incurred in the course of their duties and will
insure the corporations  against expenses incurred in defending lawsuits arising
from certain alleged acts of the directors and officers.

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES.

   During  the past three  years,  Orion  (which  completed  an  initial  public
offering in August 1995) issued the following unregistered securities,  adjusted
to reflect a  1.00-for-1.36  reverse  stock  split  effected  in July  1995.  No
underwriting  discounts or commissions  were paid in connection with any of such
transactions,  although a fee of $250,000  was paid to Salomon  Brothers Inc for
serving as a financial  advisor to Orion in connection with Orion's 1994 private
placement.  There  was  no  public  offering  in  such  transactions,   and  the
transactions  were exempt from the  registration  requirements of the Securities
Act by reason of Sections  4(2) and 3(b) thereof,  and  Regulation D promulgated
thereunder.  In each instance,  the shares of Common Stock,  shares of Preferred
Stock or warrants of Orion were issued to a limited group of purchasers, each of
which had access to and/or  was  furnished  information  concerning  Orion.  The
purchasers  acquired the securities  for investment  only and not with a view to
the distribution  thereof, and each of the certificates  representing the shares
of Common  Stock and  Preferred  Stock of Orion  issued to such  purchasers  was
stamped with a legend restricting the transfer of the shares of Common Stock and
Preferred Stock representing thereby.

Common Stock

   In December 1993, Orion issued an aggregate of 178,097 shares of Common Stock
as part of a private  placement of its Common Stock to certain of its  Directors
and affiliates of those  Directors at a purchase price of $10.20 per share.  The
terms of such issuance  permitted  the  purchasers to receive the benefit of any
lower  price at which  Common  Stock  subsequently  was  issued  in the  private
placement or to receive any other  security  subsequently  issued in the private
placement. In June 1994, when Orion issued shares of Common Stock as part of the
private  placement of its Common Stock to a limited number of  institutions  and
other investors (including 64,705 shares to affiliates of Directors) at a pur

                              II-5

<PAGE>
                                   PART II
              INFORMATION NOT REQUIRED IN PROSPECTUS (Continued)

chase price of $8.50 per share,  Orion issued 100,326  additional  shares to the
Directors and  affiliates  of Directors  who purchased  Common Stock in December
1993.  In  addition,  after Orion  issued  Series A Preferred  Stock (along with
warrants  and  options  to make an  additional  investment)  to CIBC,  Fleet and
Chisholm in June 1994,  the Directors and  affiliates of Directors who purchased
Common Stock in December 1993 each  exercised his or its right to receive Series
A  Preferred  Stock  (along  with  warrants  and  options to make an  additional
investment)  in exchange for the Common  Stock  previously  acquired,  and Orion
issued an aggregate of  $3,000,000  of Series A Preferred  Stock to such persons
and entities.

   In May 1994, Orion entered into an agreement with SS/L whereby SS/L agreed to
purchase  588,235  shares of Common  Stock for an  aggregate  purchase  price of
$5,000,000.  The  agreement  with SS/L includes a possible  sale,  under certain
circumstances,  of an additional 588,235 shares of Common Stock for an aggregate
purchase  price of  $5,000,000.  SS/L has the right to  require  the  Company to
repurchase  the 588,235  shares from SS/L if Orion  selects a company other than
SS/L as the prime  contractor in a contract for  construction  of a satellite to
serve the Asia Pacific region.  SS/L has the right, during the three year period
after the sale of the initial shares of Common Stock,  to receive more shares of
Common  Stock;  under certain  circumstances,  if Orion issues Common Stock or a
security  convertible  into or exchangeable for Common Stock for a price of less
than $8.50 per share.

   In June 1994,  Orion issued an aggregate of 174,844 shares of Common Stock as
part  of a  private  placement  of its  Common  Stock  to a  limited  number  of
institutions  and other  investors at a purchase  price of $8.50 per share.  The
terms of such issuance  permitted  the  purchasers to receive the benefit of any
lower  price at which  Common  Stock  subsequently  was  issued  in the  private
placement or to receive any other  security  subsequently  issued in the private
placement.  When Orion issued Series A Preferred  Stock (along with warrants and
options to make an additional  investment)  to CIBC,  Fleet and Chisholm in June
1994, the  institutions  and other investors who purchased  Common Stock in June
1994 each exercised  his, her or its right to receive  Series A Preferred  Stock
(along with warrants and options to make an additional  investment)  in exchange
for the Common  Stock  previously  acquired,  and Orion  issued an  aggregate of
$3,000,000 of Series A Preferred Stock to such persons and entities.

   In March 1995 (but  pursuant  to a contract  signed in  January  1994)  Orion
issued an aggregate  of 2,941  shares of Common  Stock to a  recruiting  firm as
compensation for work performed for Orion.

   In January 1997, Orion issued an aggregate of approximately  86,500 shares of
Common Stock to British Aerospace,  one of the Company's principal  stockholders
which has a  representative  on the Company's Board of Directors.  Such issuance
was pursuant to the exercise of a warrant granted in December 1991 in connection
with the formation of Orion Atlantic.

   Orion has, from time to time, issued Common Stock upon conversion of Series A
and Series B Preferred Stock.

Preferred Stock

   In June 1994, CIBC, Fleet and Chisholm purchased $11.5 million in Series A 8%
Cumulative Redeemable  Convertible Preferred Stock, which shares are convertible
into  shares of  Common  Stock at an  exercise  price of $8.50  per  share.  See
"Description  of Capital Stock -- Preferred  Stock." CIBC,  Fleet,  and Chisholm
also were  granted  the right to invest an  additional  $3.8  million in similar
preferred stock,  except that such similar  preferred stock would be convertible
at any time into  Common  Stock at a price  within a range from $10.20 to $17.00
per share of Common  Stock based upon when the option is  exercised  and certain
other  factors.  CIBC,  Fleet,  and  Chisholm  also were  granted a  contractual
"preemptive"  right to purchase a pro rata portion of any equity securities sold
by Orion in the  future on the same  terms  and  conditions  as sold to  others,
subject to  certain  exceptions  for  securities  sold or granted to  employees,
certain small offerings, and existing rights to acquire equity securities. CIBC,
Fleet and Chisholm also were granted certain warrants (issued  concurrently with
the Series A Preferred  Stock) to purchase Common Stock at the conversion  price
of such  Series A Preferred  Stock.  These  warrants  do not become  exercisable
unless Orion  exercise its right to repurchase  the Series A Preferred  Stock at
the liquidation  value (plus accrued and unpaid  dividends).  In connection with
the transaction,  CIBC and Fleet each were granted the right to elect one member
of Orion's Board of Directors.

                              II-6

<PAGE>
                                   PART II
              INFORMATION NOT REQUIRED IN PROSPECTUS (Continued)

   After Orion issued Series A Preferred  Stock (along with warrants and options
to make an additional  investment) to CIBC, Fleet and Chisholm in June 1994, the
Directors and  affiliates  of Directors  who purchased  Common Stock in December
1993 and the institutions and other investors who purchased Common Stock in June
1994 each exercised  his, her or its right to receive  Series A Preferred  Stock
(along with warrants and options to make an additional  investment)  in exchange
for the Common Stock  previously  acquired and Orion issued an aggregate of $3.0
million of Series A Preferred Stock to such persons and entities.

   In June 1995,  CIBC and certain  Directors  and  affiliates  of Directors who
purchased  Series A Preferred  Stock in June 1994 purchased  approximately  $4.2
million in Series B Preferred  Stock of Orion.  This purchase was pursuant to an
option  granted in June 1994 to purchase $1 of  preferred  stock  similar to the
Series A Preferred  Stock for each $3 of Series A Preferred  Stock  purchased in
June 1994,  except that such similar preferred stock would be convertible at any
time into Common Stock at a price within a range from $10.20 to $17.00 per share
of Common Stock based upon when the option is exercised.  The Series B Preferred
Stock has rights, designations and preferences substantially similar to those of
the Series A Preferred Stock discussed above, except that the Series B Preferred
Stock is convertible  into Common Stock at an initial price of $10.20 per share,
subject to certain anti-dilution adjustments, and purchase of Series B Preferred
Stock  did not  result  in the  purchasers  receiving  any  rights  to  purchase
additional  preferred stock. The purchasers of the Series B Preferred Stock also
were granted certain warrants (issued  concurrently with the Preferred Stock) to
purchase Common Stock at the conversion  price of such Series B Preferred Stock.
These  warrants do not become  exercisable  unless Orion  exercises its right to
repurchase the Series B Preferred Stock at the  liquidation  value (plus accrued
and unpaid dividends).

Warrants

   In May 1994,  in connection  with the sale of Common Stock to SS/L  discussed
under "Common Stock" above,  Orion granted an option to SS/L to purchase 588,235
shares of Common  Stock at a price of $8.50 per share  prior to January 1, 1995,
which option has expired.

   In June  1994,  in  connection  with the sale of  Series  A  Preferred  Stock
discussed under "Preferred Stock" above,  Orion granted an option to the holders
of Series A  Preferred  Stock to invest an  additional  $4.8  million in similar
preferred  stock (except that such similar  preferred stock would be convertible
at any time into Common Stock at a price based upon when the option is exercised
within a range from $10.20 to $17.00 per share of Common Stock). The purchase of
Series B Preferred  Stock in June 1995  represented  an exercise of the right to
invest approximately $4.5 million of this amount. Orion also granted the holders
of Preferred  Stock certain  warrants to purchase Common Stock at the conversion
price of such Preferred Stock.  These warrants do not become  exercisable unless
Orion  exercises its right to repurchase the Preferred  Stock at the liquidation
value (plus accrued and unpaid dividends).

   In December 1996,  Orion issued an option to DACOM to purchase  50,000 shares
of Common Stock at a price of $14.00 per share. The warrant is exercisable for a
six (6) month period  beginning six (6) months after the  commencement  date, as
defined  in the Joint  Investment  Agreement,  and ending one (1) year after the
commencement  date  and will  terminate  at that  time or at any time the  Joint
Investment Agreement between DACOM and Orion is terminated. 

                              II-7

<PAGE>


ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

   (a) Exhibits.


   EXHIBIT
    NUMBER                                                      DESCRIPTION
    ------                                                      -----------
   
1.1            Form of Underwriting Agreement
2.1            Agreement and Plan of Merger, dated January 8, 1997, by and among
               Orion Network Systems, Inc., Orion Newco Services, Inc. and Orion
               Merger Company, Inc. (Incorporated by reference to exhibit number
               2.1 in Registration  Statement No. 333-19795 on Form S-4 of Orion
               Newco Services, Inc.)
3.1            Form of  Restated  Certificate  of  Incorporation  of Orion Newco
               Services,  Inc.  (Incorporated by reference to exhibit number 3.1
               in  Registration  Statement  No.  333-19795  on Form S-4 of Orion
               Newco Services,  Inc.) 
3.2            Bylaws of Orion Newco Services,  Inc.  (Incorporated by reference
               to exhibit number 3.2 in Registration  Statement No. 333-19795 on
               Form S-4 of Orion Newco Services, Inc.)
3.3            Certificate  of  Incorporation  of Orion  Network  Systems,  Inc.
               (Incorporated  by reference to exhibit number 3.1 in Registration
               Statement  No.  33-80518  on Form S-1 of Orion  Network  Systems,
               Inc.)
3.4            Bylaws of Orion Network Systems, Inc.  (Incorporated by reference
               to exhibit number 3.2 in  Registration  Statement No. 33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
3.5            Certificate of Incorporation of Orion Satellite Corporation
3.6            Bylaws of Orion Satellite Corporation
3.7            Certificate  of  Limited  Partnership  of  International  Private
               Satellite Partners, L.P.
3.8            Form  of  Third   Amended  and  Restated   Agreement  of  Limited
               Partnership of International Private Satellite Partners, L.P.
3.9            Certificate of Incorporation of OrionNet, Inc.
3.10           Bylaws of OrionNet, Inc.
3.11           Certificate of Incorporation of Orion Asia Pacific Corporation*
3.12           Bylaws of Orion Asia Pacific Corporation
3.13           Certificate of Incorporation OrionNet Finance Corporation
3.14           Bylaws of OrionNet Finance Corporation
3.15           Certificate   of   Incorporation   of  Asia  Pacific   Space  and
               Communications, Ltd.
3.16           Amended  and   Restated   Bylaws  of  Asia   Pacific   Space  and
               Communications, Ltd.
3.17           Certificate of Incorporation of Orion Atlantic Europe, Inc.
3.18           Bylaws of Orion Atlantic Europe, Inc.
4.1            Form of Senior Note Indenture and Form of Note included therein
4.2            Form of Senior  Discount Note Indenture and Form of Note included
               therein
4.3            Form of Collateral Pledge and Securitiy Agreement
4.4            INTENTIONALLY OMITTED
4.5            Form of Warrant Agreement, by and between Orion and Bankers Trust
               Company, and Form of Warrant included therein    
4.6            Forms of Warrant issued by Orion.  (Incorporated  by reference to
               exhibit number 4.1 in Registration Statement No. 33-80518 on Form
               S-1 of Orion Network Systems, Inc.)
4.7            Forms of Warrant  issued by Orion to holders of Preferred  Stock.
               (Incorporated  by reference to exhibit number 4.2 in Registration
               Statement  No.  33-80518  on Form S-1 of Orion  Network  Systems,
               Inc.)
4.8            Forms of  Certificates  of  Designation of Series A 8% Cumulative
               Redeemable  Convertible  Preferred Stock,  Series B 8% Cumulative
               Redeemable Convertible Preferred Stock and Series C 6% Cumulative
               Redeemable Convertible Preferred Stock of Orion. (Incorporated by
               reference to exhibit  number 4.3 in  Registration  Statement  No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)

                              II-9

<PAGE>
   EXHIBIT
    NUMBER                                                      DESCRIPTION
    ------                                                      -----------
4.9            Forms of Series A Preferred  Stock,  Series B Preferred Stock and
               Series C Preferred Stock certificates of Orion.  (Incorporated by
               reference to exhibit  number 4.4 in  Registration  Statement  No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
4.10           Form of  Common  Stock  Certificate  of Orion.  (Incorporated  by
               reference to exhibit  number 4.5 in  Registration  Statement  No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
4.11           Forms of  Certificates  of  Designation of Series A 8% Cumulative
               Redeemable Convertible Preferred Stock and Series B 8% Cumulative
               Redeemable  Convertible Preferred Stock of Orion Network Systems,
               Inc.   (Incorporated  by  reference  to  exhibit  number  4.4  in
               Registration Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.).
4.12            Form of Warrant issued to DACOM Corp. (Incorporated by reference
               to exhibit number 4.6 in Registration  Statement No. 333-19795 on
               Form S-4 of Orion Newco Services, Inc.)
4.13           Debenture  Purchase  Agreement,  dated  January  13,  1997,  with
               British  Aerospace  and  Matra  Marconi  Space  (Incorporated  by
               reference to exhibit  number 4.7 in  Registration  Statement  No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
5.1            Opinion of Hogan & Hartson L.L.P.*
   
8.1            Opinion of Hogan & Hartson  L.L.P.  with  respect to certain  tax
               matters*     
10.1           Second Amended and Restated Purchase  Agreement,  dated September
               26,  1991  ("Satellite  Contract")  by and between  OrionSat  and
               British  Aerospace  PLC  and the  First  Amendment,  dated  as of
               September  15, 1992,  Second  Amendment,  dated as of November 9,
               1992,  Third  Amendment,  dated  as of  March  12,  1993,  Fourth
               Amendment,  dated as of April 15, 1993, Fifth Amendment, dated as
               of September  22,  1993,  Sixth  Amendment,  dated as of April 6,
               1994,  Seventh  Amendment,  dated as of  August 9,  1994,  Eighth
               Amendment,  dated as of December  8, 1994,  and  Amendment  No. 9
               dated October 24, 1995, thereto. [CONFIDENTIAL TREATMENT HAS BEEN
               GRANTED  FOR  PORTIONS  OF  THESE  DOCUMENTS.]  (Incorporated  by
               reference  to  exhibits  number  10.13 and 10.14 in  Registration
               Statement  No.  33-80518  on Form S-1 of Orion  Network  Systems,
               Inc.)
10.2           Restated  Amendment No. 10 dated December 10, 1996, between Orion
               Atlantic  and  Matra  Marconi  Space to the  Second  Amended  and
               Restated  Purchase  Agreement,  dated  September  26, 1991 by and
               between  OrionSat and British  Aerospace PLC (which  contract and
               prior exhibits thereto were  incorporated by reference as exhibit
               number 10.1).  (Incorporated  by reference to exhibit number 10.2
               in  Registration  Statement  No.  333-19795  on Form S-4 of Orion
               Newco Services, Inc.)
10.3           Ground Support System  Agreement,  dated as of August 2, 1991, by
               and between Orion  Atlantic and Telespazio  S.p.A.  [CONFIDENTIAL
               TREATMENT  HAS  BEEN  GRANTED  FOR  PORTIONS  OF THIS  DOCUMENT.]
               (Incorporated   by   reference   to  exhibit   number   10.25  in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.)
10.4           Italian  Facility and Services  Agreement,  dated as of August 2,
               1991, by and between OrionSat and Telespazio S.p.A. as amended by
               the  amendment  thereto,  dated  March  19,  1994.  [CONFIDENTIAL
               TREATMENT  HAS BEEN  GRANTED FOR  PORTIONS  OF THESE  DOCUMENTS.]
               (Incorporated   by   reference   to  exhibit   number   10.26  in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.)
10.5           Contract for a Satellite Control System,  dated December 7, 1992,
               by and  between  Orion  Atlantic,  Telespazio  S.p.A.  and Martin
               Marietta  Corporation.  [CONFIDENTIAL  TREATMENT HAS BEEN GRANTED
               FOR  PORTIONS OF THIS  DOCUMENT.]  (Incorporated  by reference to
               exhibit number 10.31 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.6           Credit  Agreement,  dated as of November 23, 1993, by and between
               Orion Atlantic, OrionSat and General Electric Capital Corporation
               ("GECC").  [CONFIDENTIAL  TREATMENT HAS BEEN GRANTED FOR PORTIONS
               OF THIS DOCUMENT.]  (Incorporated  by reference to exhibit number
               10.32 in Registration Statement No. 33-80518 on Form S-1 of Orion
               Network Systems, Inc.)
10.7           Security Agreement, dated as of November 23, 1993, by and between
               Orion Atlantic,  OrionSat and GECC. (Incorporated by reference to
               exhibit number 10.33 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.8           Assignment and Security Agreement, dated as of November 23, 1993,
               by and between Orion Atlantic,  OrionSat and GECC.  (Incorporated
               by reference to exhibit  number 10.34 in  Registration  Statement
               No. 33-80518 on Form S-1 of Orion Network Systems, Inc.)

                                      II-10

<PAGE>



   EXHIBIT
    NUMBER                                                      DESCRIPTION
    ------                                                      -----------
   
10.9           Consent and  Agreement,  dated as of November  23,  1993,  by and
               between Orion  Atlantic,  Martin  Marietta  Corporation and GECC.
               (Incorporated   by   reference   to  exhibit   number   10.35  in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.)
10.10          Deed of Trust,  dated as of  November  23,  1993,  by and between
               Orion  Atlantic,  W. Allen Ames,  Jr. and Michael J.  Schwel,  as
               Trustees, and GECC.  (Incorporated by reference to exhibit number
               10.37 in Registration Statement No. 33-80518 on Form S-1 of Orion
               Network Systems, Inc.)
 10.11         Lease  Agreement,  dated as of November 23, 1993,  by and between
               OrionNet,  Inc. and Orion  Atlantic,  as amended by an Amendment,
               dated January 3, 1995.  [CONFIDENTIAL  TREATMENT HAS BEEN GRANTED
               FOR PORTIONS OF THESE  DOCUMENTS.]  (Incorporated by reference to
               exhibit number 10.38 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)    
10.12          Note for Interim  Loans,  dated as of November 23,  1993,  by and
               between Orion  Atlantic and GECC.  (Incorporated  by reference to
               exhibit number 10.42 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network
               Systems, Inc.)
10.13          Sales  Representation  Agreement  and Ground  Operations  Service
               Agreement, each dated as of May 1, 1994 and June 30, 1994, by and
               between  each of  OrionNet,  Inc.  and  Kingston  Communications,
               respectively,  and Orion Atlantic, as amended by side agreements,
               dated  May  1,  1994,   July  12,  1994  and  February  1,  1995.
               [CONFIDENTIAL  TREATMENT  HAS BEEN  GRANTED FOR PORTIONS OF THESE
               DOCUMENTS.] (Incorporated by reference to exhibit number 10.43 in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.)
10.14          Lease  Agreement,  dated as of October 2,  1992,  by and  between
               OrionNet and Research Grove  Associates,  as amended by Amendment
               No. 1, dated March 26,  1993,  Amendment  No. 2, dated August 23,
               1993, and Amendment No. 3, dated December 20, 1993. (Incorporated
               by reference to exhibit  number 10.39 in  Registration  Statement
               No.  33-80518  on  Form  S-1  of  Orion  Network  Systems,  Inc.)
                  
10.15          Sales  Representation  Agreement  and Ground  Operations  Service
               Agreement,  dated as of June 30,  1995,  by and  between  MCN Sat
               Service,  S.A. and Orion  Atlantic.  [CONFIDENTIAL  TREATMENT HAS
               BEEN GRANTED FOR  PORTIONS OF THIS  DOCUMENT.]  (Incorporated  by
               reference  to  exhibit  number  10.69  in  Orion's   Registration
               Statement No. 33-80518 on Form S-1.)
    
10.16          Volume Purchase Agreement, dated January 18, 1995, by and between
               the Company and Dornier  GmbH.  [CONFIDENTIAL  TREATMENT HAS BEEN
               GRANTED  FOR  PORTIONS  OF  THIS  DOCUMENT.]   (Incorporated   by
               reference to exhibit number 10.66 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)
10.17          Product  Development,  License  and  Marketing  Agreement,  dated
               January 18,  1995,  by and between the Company and Dornier  GmbH.
               [CONFIDENTIAL  TREATMENT  HAS BEEN  GRANTED FOR  PORTIONS OF THIS
               DOCUMENT.]  (Incorporated by reference to exhibit number 10.65 in
               Orion's Registration Statement No. 33-80518 on Form S-1.)
10.18          Sales Representation Agreement,  dated as of June 8, 1995, by and
               between  Nortel  Dasa  Network  Systems  GmbH & Co.  KG and Orion
               Atlantic.  [CONFIDENTIAL  TREATMENT HAS BEEN GRANTED FOR PORTIONS
               OF THIS DOCUMENT.]  (Incorporated  by reference to exhibit number
               10.70 in Registration Statement No. 33-80518 on Form S-1 of Orion
               Network Systems, Inc.)
10.19          Orion 2  Spacecraft  Purchase  Contract,  dated  July  31,  1996,
               between  Orion  Atlantic and Matra Marconi  Space.  [CONFIDENTIAL
               TREATMENT  HAS  BEEN  GRANTED  FOR  PORTIONS  OF THIS  DOCUMENT.]
               (Incorporated   by   reference   to  exhibit   number   10.19  in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)
10.20          Orion's  Amended and Restated  1987 Stock Option Plan as amended.
               (Incorporated   by   reference   to  exhibit   number   10.23  in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.)
10.21          Purchase  Contract,  dated  December  4,  1991,  by  and  between
               OrionNet,   Inc.,  Shenandoah  Valley  Leasing  Company  and  MCI
               Telecommunications Corporation.  [CONFIDENTIAL TREATMENT HAS BEEN
               GRANTED FOR PORTION OF THIS DOCUMENT.] (Incorporated by reference
               to exhibit number 10.30 in Registration Statement No. 33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.22          Amended and Restated  Partnership  Agreement  of Orion  Financial
               Partnership,  dated as of April 15, 1994, by and between OrionNet
               and Computer Leasing Inc. ("CLI").  (Incorporated by reference to
               exhibit number 10.44 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.23          Continuing  Guaranty,  dated as of April 15, 1994, of the Company
               of the obligations of OrionNet Finance Corporation. (Incorporated
               by reference to exhibit  number 10.45 in  Registration  Statement
               No. 33-80518 on Form S-1 of Orion Network Systems, Inc.)

                                      II-11

<PAGE>
   EXHIBIT
    NUMBER                                                      DESCRIPTION
    ------                                                      -----------
10.24          Release of Continuing Guaranty, dated as of December 29, 1994, by
               the Orion Financial  Partnership.  (Incorporated  by reference to
               exhibit number 10.46 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.25          Confirmation  of  Continuing  Guaranty,  dated as of December 29,
               1994, of the Company of the obligation of OFC.  (Incorporated  by
               reference to exhibit number 10.47 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)
10.26          Continuing  Guarantee,  dated as of December 29, 1994,  by Lessor
               Capital Funding  Limited  Partnership in favor of Orion Financial
               Partnership.  (Incorporated  by reference to exhibit number 10.48
               in  Registration  Statement  No.  33-80518  on Form  S-1 of Orion
               Network Systems,  Inc.) 10.27Master Lease Agreement,  dated as of
               April 15,  1994,  by and  between  OrionNet  and Orion  Financial
               Partnership.  (Incorporated  by reference to exhibit number 10.49
               in  Registration  Statement  No.  33-80518  on Form  S-1 of Orion
               Network Systems, Inc.)
10.28          Collateral  Assignment and Pledge and Security  Agreement,  dated
               April  22,  1994,   by  and  between  CLI  and  Orion   Financial
               Partnership.  (Incorporated  by reference to exhibit number 10.50
               in  Registration  Statement  No.  33-80518  on Form  S-1 of Orion
               Network Systems, Inc.)
10.29          Purchase  Agreement,  dated as of April 22, 1994,  by and between
               OrionNet  and  Orion  Financial  Partnership.   (Incorporated  by
               reference to exhibit number 10.51 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)
10.30          Stock  Purchase  Agreement,  dated as of April 29,  1994,  by and
               between the  Company  and SS/L.  (Incorporated  by  reference  to
               exhibit number 10.53 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.31          Registration Rights Agreement, dated as of April 29, 1994, by and
               between the  Company  and SS/L.  (Incorporated  by  reference  to
               exhibit number 10.54 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.32          Purchase Agreement, dated as of June 17, 1994, by and between the
               Company, CIBC, Fleet and Chisholm.  (Incorporated by reference to
               exhibit number 10.55 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.33          Stockholders Agreement, dated as of June 17, 1994, by and between
               the  Company,   CIBC,  Fleet,   Chisholm  and  certain  principal
               stockholders  of  the  Company.  (Incorporated  by  reference  to
               exhibit number 10.56 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.) 10.34Registration Rights
               Agreement, dated as of June 17, 1994, by and between the Company,
               CIBC,  Fleet and Chisholm.  (Incorporated by reference to exhibit
               number 10.57 in  Registration  Statement No. 33-80518 on Form S-1
               of Orion Network Systems, Inc.)
10.35          Purchase  Agreement,  dated as of June 19, 1995, by and among the
               Company, CIBC, Fleet and an affiliate of Fleet.  (Incorporated by
               reference to exhibit number 10.58 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)
10.36          Definitive Agreement,  dated April 26, 1990, by and between Orion
               Asia Pacific and the Republic of the Marshall Islands and a Stock
               Option  Agreement  related thereto.  [CONFIDENTIAL  TREATMENT HAS
               BEEN GRANTED FOR PORTIONS OF THESE  DOCUMENTS.]  (Incorporated by
               reference to exhibit number 10.60 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)
   
10.37          Option  Agreement,  dated December 10, 1996, by and between Orion
               Atlantic and Matra  Marconi  Space.  [CONFIDENTIAL  TREATMENT HAS
               BEEN GRANTED FOR  PORTIONS OF THIS  DOCUMENT.]  (Incorporated  by
               reference to exhibit number 10.37 in  Registration  Statement No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
10.38          Memorandum   of  Agreement  for  the   Procurement   of  Orion  2
               Spacecraft,  dated  December  19,  1996,  by  and  between  Orion
               Atlantic and Matra  Marconi  Space.  [CONFIDENTIAL  TREATMENT HAS
               BEEN GRANTED FOR  PORTIONS OF THIS  DOCUMENT.]  (Incorporated  by
               reference to exhibit number 10.38 in  Registration  Statement No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
10.39          TT&C Earth Station  Agreement,  dated as of November 11, 1996, by
               and between  Orion Asia  Pacific  and DACOM  Corp.  [CONFIDENTIAL
               TREATMENT  HAS  BEEN  GRANTED  FOR  PORTIONS  OF THIS  DOCUMENT.]
               (Incorporated   by   reference   to  exhibit   number   10.39  in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)    

                                      II-12

<PAGE>
   EXHIBIT
    NUMBER                                                      DESCRIPTION
    ------                                                      -----------
10.40          Joint Investment Agreement, dated as of November 11, 1996, by and
               between   Orion  Asia  Pacific  and  DACOM  Corp.   [CONFIDENTIAL
               TREATMENT   HAS BEEN  GRANTED   FOR  PORTIONS OF THIS  DOCUMENT.]
               (Incorporated   by   reference   to  exhibit   number   10.40  in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)
10.41          Orion  Network  Systems,   Inc.   Employee  Stock  Purchase  Plan
               (Incorporated  by reference to exhibit number 4.4 in Registration
               Statement  No.  333-19021 on Form S-8 of Orion  Network  Systems,
               Inc.)
10.42          Orion  Network   Systems,   Inc.   401(k)  Profit   Sharing  Plan
               (Incorporated  by reference to exhibit number 4.5 in Registration
               Statement  No.  333-19021 on Form S-8 of Orion  Network  Systems,
               Inc.)
10.43          Orion Network Systems,  Inc.  Non-Employee  Director Stock Option
               Plan  (Incorporated  by  reference  to  exhibit  number  10.43 in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)
10.44          Exchange  Agreement dated June 1996 among Orion Network  Systems,
               Orion Atlantic,  OrionSat and the Limited Partners  (Incorporated
               by  reference  to exhibit 10 in Current  Report on Form 8-K dated
               December 20, 1996, of
               Orion Network Systems, Inc.)
10.45          First  Amendment to Exchange  Agreement dated December 1996 among
               Orion Network Systems,  Orion Atlantic,  OrionSat and the Limited
               Partners.  (Incorporated  by reference to exhibit number 10.45 in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)
10.46          Redemption Agreement dated November 21, 1995, by and between STET
               and Orion Atlantic, the promissory notes delivered thereunder and
               Instrument  of  Redemption  relating  thereto.  (Incorporated  by
               reference  to exhibit  number 10.1 in Current  Report on Form 8-K
               dated November 21, 1995 of Orion Network Systems, Inc.)
10.47          IPSP-Telecom  Italia  Agreement  dated  November 21, 1995, by and
               between   Telecom  Italia  and  Orion   Atlantic.   [CONFIDENTIAL
               TREATMENT  HAS  BEEN  GRANTED  FOR  PORTIONS  OF THIS  DOCUMENT.]
               (Incorporated  by  reference  to exhibit  number  10.2 in Current
               Report  on Form 8-K  dated  November  21,  1995 of Orion  Network
               Systems, Inc.)
10.48          Indemnity Agreement dated November 21, 1995, by and among Telecom
               Italia,  Orion  Atlantic,   Orion  and  STET.   (Incorporated  by
               reference  to exhibit  number 10.3 in Current  Report on Form 8-K
               dated November 21, 1995 of Orion Network Systems, Inc.)
10.49          Subscription  Agreement  dated  November 21, 1995, by and between
               Orion and  Orion  Atlantic,  and the  promissory  note  delivered
               thereunder.  (Incorporated by reference to exhibit number 10.5 in
               Current  Report  on Form 8-K  dated  November  21,  1995 of Orion
               Network Systems, Inc.).
10.50          First  Amendment  to the Italian  Facility and Services Agreement
               dated  November 21, 1995, by and between Orion Atlantic and Nuova
               Telespazio.  (Incorporated by reference to exhibit number 10.7 in
               Current  Report  on Form 8-K  dated  November  21,  1995 of Orion
               Network Systems, Inc.).
10.51          Registration  Rights  Agreement,  dated  January 13, 1997, by and
               among Orion Newco Services,  Inc.,  British  Aerospace  Holdings,
               Inc.  and Matra  Marconi  Space.  (Incorporated  by  reference to
               exhibit number 10.51 in Registration  Statement No.  333-19795 on
               Form S-4 of Orion Newco Services, Inc.)
   
10.52          Orion 3 Spacecraft Purchase Contract,  dated January 15, 1997, by
               and among Hughes Space and  Communications  International,  Inc.,
               Orion  Asia  Pacific   Corporation  and  Orion  Network  Systems.
               {CONFIDENTIAL  TREATMENT HAS BEEN  REQUESTED FOR PORTIONS OF THIS
               DOCUMENT.  THE CONFIDENTIAL PORTIONS HAVE BEEN REDACTED AND FILED
               SEPARTELY WITH THE COMMISSION.]*
12.1           Statement  Regarding  Computation  of Ratio of  Earnings to Fixed
               Charges.
21.1           List of  subsidiaries  of Orion.  (Incorporated  by references to
               exhibit number 21.1 in  Registration  Statement No.  333-19795 on
               Form S-4 of Orion Newco Services, Inc.)
23.1           Consent of Ernst & Young LLP
23.2           Consent  of Hogan & Hartson  L.L.P.  (included  in their  opinion
               filed as Exhibit 5.1).*
23.3           Consent of Ascent Communications Advisors, L.P.
24.1           Powers  of  Attorney  (included  on the  signature  pages  of the
               Registration Statement).
26.1           Form T-1 Statement of  Eligibility  and  Qualification  under the
               Trust  Indenture Act of 1939, as amended of Bankers Trust Company
               as trustee (Separately Bound)*
99.1           Orders of FCC regarding  OrionSat.  (Incorporated by reference to
               exhibit  number 99.1 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.).
99.2           Valuation  for Orion  Atlantic as of December 1, 1996,  by Ascent
               Communications  Advisors, L.P.  (Included as Attachement A to the
               Prospectus which is a part of this Registration Statement.)    
- ----------
   * To be filed by amendment.

                                      II-12
<PAGE>



   

   (b) Financial Statements and Schedules:

   (1) Financial Statements

   The financial  statements  filed as part of this  Registration  Statement are
listed in the Index to Financial Statements on page F-1.

   (2) Schedules

   The financial  statement  schedules of the Company have been omitted  because
the  information  required to be set forth therein is not applicable or is shown
in the Financial Statements or Notes thereto.     

ITEM 17. UNDERTAKINGS.

   
   The undersigned Registrants hereby undertake:

   (a)(1) To file,  during any period in which offers or sales are being made, a
post-effective amendment to this registration statement;

   (i) To include any prospectus required by Section 10(a)(3) of the
Securities Act of 1933;

   (ii) To  reflect  in the  prospectus  any facts or events  arising  after the
effective date of the Registration  Statement (or the most recent post-effective
amendment  thereof)  which,  individually  or  in  the  aggregate,  represent  a
fundamental  change in the information set forth in the Registration  Statement.
Notwithstanding the foregoing,  any increase or decrease in volume of securities
offered (if the total dollar value of  securities  offered would not exceed that
which  was  registered)  and any  deviation  from  the  low or  high  and of the
estimated  maximum  offering  range may be reflected  in the form of  prospectus
filed with the  Commission  pursuant  to Rule 424(b) if, in the  aggregate,  the
changes in volume and price  represent  no more than a 20 percent  change in the
maximum  aggregate  offering price set forth in the "Calculation of Registration
Fee" table in the effective registration statement.

   (iii)  To  include  any  material  information  with  respect  to the plan of
distribution  not  previously  disclosed  in the  Registration  Statement or any
material change to such information in the Registration Statement;

   (2) That, for the purpose of determining  any liability  under the Securities
Act of 1933,  each  such  post-effective  amendment  shall be deemed to be a new
registration  statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

   (3) To remove from registration by means of a post-effective amendment any of
the securities  being  registered  which remain unsold at the termination of the
offering.

   (b) That, for purposes of determining any liability under the Securities Act,
the  information  omitted  from  the  form of  prospectus  filed as part of this
Registration  Statement in reliance  upon Rule 430A and contained in the form of
prospectus  filed by the Registrant  pursuant to Rule 424(b)(1) or (4) or 497(h)
under  the  Securities  Act  shall  be  deemed  to be part of this  Registration
Statement as of the time it was declared effective; and

   (c) That, for the purpose of determining  any liability  under the Securities
Act, each  post-effective  amendment that contains a form of prospectus shall be
deemed to be a new  registration  statement  relating to the securities  offered
therein,  and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
    

Insofar as indemnification  for liabilities arising under the Securities Act may
be permitted to directors,  officers and controlling  persons of the Registrants
pursuant to the foregoing  provisions,  or otherwise,  the Registrants have been
advised that in the opinion of the Securities and Exchange Commission such

                                      II-13

<PAGE>

indemnification  is against public policy as expressed in the Securities Act and
is,  therefore,  unenforceable.  In the event  that a claim for  indemnification
against such liabilities  (other than the payment by the Registrants of expenses
incurred or paid by a director,  officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director,  officer or controlling person in connection with the securities being
registered,  the  Registrants  will,  unless in the opinion of their counsel the
matter  has  been  settled  by  controlling  precedent,  submit  to a  court  of
appropriate  jurisdiction  the question  whether such  indemnification  by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.

                                      II-14

<PAGE>

                                  SIGNATURES


   Pursuant to the  requirements of the Securities Act of 1933, as amended,  the
Registrant has duly caused this Amendment No. 1 to Registration  Statement to be
signed on its behalf by the undersigned,  thereunto duly authorized, in the City
of Rockville, State of Maryland, on the 22nd day of January, 1997.

                                             ORION NEWCO SERVICES, INC. 


                                             By: /s/ W. Neil Bauer     
                                                 -------------------------
                                                 W. Neil Bauer              
                                                 President                  
                                             
   Pursuant to the requirements of the Securities Act of 1933, as amended,  this
Amendment No. 1 to Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.

<TABLE>
<CAPTION>

          Signature                                 Title                              Date
          ---------                                 -----                              ----

<S>                                     <C>                                         <C>
/s/ W. Neil Bauer
- -------------------------------               President and Director                January 22, 1997
       W. Neil Bauer                      (Principal Executive Officer)

/s/ David J. Frear
- -------------------------------          Vice President, Chief Financial            January 22, 1997
         David J. Frear                       Officer and Director
                                          (Principal Financial Officer
                                        and Principal Accounting Officer)

/s/  Richard H. Shay*
- --------------------------------              Secretary and Director                January 22, 1997
        Richard H. Shay


*By: /s/ David J. Frear
     -----------------------------
              David J. Frear
             Attorney-in-Fact
</TABLE>


                                      II-15

<PAGE>

                                  SIGNATURES


   Pursuant to the  requirements of the Securities Act of 1933, as amended,  the
Registrant has duly caused this Amendment No. 1 to Registration  Statement to be
signed on its behalf by the undersigned,  thereunto duly authorized, in the City
of Rockville, State of Maryland, on the 22nd day of January, 1997.

                                             ORION NETWORK SERVICES, INC. 
                                             By: /s/ W. Neil Bauer       
                                                 -------------------------
                                                 W. Neil Bauer                
                                                 President                    
                                             
   Pursuant to the requirements of the Securities Act of 1933, as amended,  this
Amendment No. 1 to Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
           SIGNATURE                             TITLE                         DATE
- ------------------------------  -------------------------------------- --------------------
<S>                             <C>                                    <C>
                                
/s/ W. Neil Bauer              President, Chief Executive                               
- ------------------------------   Officer and Director                                     
W. Neil Bauer                    (Principal Executive Officer)         January 22, 1997

/s/ David J. Frear             Vice President, Chief Financial                        
- ------------------------------   Officer and Treasurer                                  
David J. Frear                   (Principal Financial Officer                           
                                 and Principal Accounting Officer)     January 22, 1997
                                

/s/ Gustave M. Hauser*          Chairman and Director                  January 22, 1997
- -----------------------------   
Gustave M. Hauser               

/s/ John V. Saeman*             Director                               January 22, 1997
- ----------------------------
John V. Saeman 

/s/ John G. Puente*             Director                               January 22, 1997
- ----------------------------
John G. Puente 

/s/ Richard J. Brekka*          Director                               January 22, 1997
- ----------------------------
Richard J. Brekka 

/s/ Warren B. French, Jr.*      Director                               January 22, 1997
- ----------------------------  
Warren B. French, Jr. 

/s/ Sidney S. Kahn*             Director                               January 22, 1997
- ----------------------------
Sidney S. Kahn 

                                Director                               January __, 1997
- ----------------------------   
W. Anthony Rice 

                                      II-16

<PAGE>
                             SIGNATURES (Continued)

           SIGNATURE                             TITLE                         DATE
- ------------------------------  -------------------------------------- --------------------
/s/ Robert M. Van Degna*        Director                               January 22, 1997
- ----------------------------
Robert M. Van Degna 

/s/ Barry Horowitz*             Director                               January 22, 1997
- ----------------------------
Barry Horowitz 

</TABLE>


*By: /s/ David J. Frear
     ----------------------
        David J. Frear
       Attorney-in-Fact


                                      II-17

<PAGE>



                                  SIGNATURES


   Pursuant to the  requirements of the Securities Act of 1933, as amended,  the
Registrant has duly caused this Amendment No. 1 to Registration  Statement to be
signed on its behalf by the undersigned,  thereunto duly authorized, in the City
of Rockville, State of Maryland, on the 22nd day of January, 1997.

                               ORION SATELLITE CORPORATION           
                               By: /s/ W. Neil Bauer
                                   -------------------------------- 
                                       W. Neil Bauer                         
                                       Chairman and Chief Executive Officer  
                                          
   Pursuant to the requirements of the Securities Act of 1933, as amended,  this
Amendment No. 1 to Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.

<TABLE>
<CAPTION>


          Signature                                 Title                              Date
          ---------                                 -----                              ----

<S>                                     <C>                                         <C>
/s/ W. Neil Bauer                         Chairman, Chief Executive                January 22, 1997
- -------------------------------             Officer and Director                   
       W. Neil Bauer                        (Principal Executive Officer)

/s/ Douglas Newman*                        President and Director                  January 22, 1997
- ------------------------------- 
     Douglas Newman               

/s/  David J. Frear                        Vice President, Chief Financial         January 22, 1997
- --------------------------------             Officer and Director                 
      David J. Frear                         (Principal Financial Officer
                                             and Principal Accounting
                                             Officer)


*By: /s/ David J. Frear
     --------------------------
          David J. Frear
         Attorney-in-Fact

</TABLE>

                              II-18

<PAGE>

                                   SIGNATURES


   Pursuant to the  requirements of the Securities Act of 1933, as amended,  the
Registrant has duly caused this Amendment No. 1 to Registration  Statement to be
signed on its behalf by the undersigned,  thereunto duly authorized, in the City
of Rockville, State of Maryland, on the 22nd day of January, 1997.

                                  INTERNATIONAL PRIVATE SATELLITE  
                                  PARTNERS, L.P.                   

                                  BY: ORION SATELLITE CORPORATION  
                                                                   
                                  
                                  By: /s/ W. Neil Bauer
                                      -----------------------------------
                                       W. Neil Bauer                          
                                       Chairman and Chief Executive Officer   
                                  

   Pursuant to the requirements of the Securities Act of 1933, as amended,  this
Amendment No. 1 to Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
          Signature                                 Title                              Date
          ---------                                 -----                              ----

<S>                                     <C>                                         <C>
/s/ W. Neil Bauer                         Chairman, Chief Executive                January 22, 1997
- -------------------------------             Officer and Director                   
       W. Neil Bauer                        (Principal Executive Officer)

/s/ Douglas Newman*                        President and Director                  January 22, 1997
- ------------------------------- 
     Douglas Newman               

/s/  David J. Frear                        Vice President, Chief Financial         January 22, 1997
- --------------------------------             Officer and Director                 
      David J. Frear                         (Principal Financial Officer
                                             and Principal Accounting
                                             Officer)


*By: /s/ David J. Frear
     --------------------------
          David J. Frear
         Attorney-in-Fact

</TABLE>
                                      II-19

<PAGE>



                                      -
                            SIGNATURES (Continued)

                                  SIGNATURES


   Pursuant to the  requirements of the Securities Act of 1933, as amended,  the
Registrant has duly caused this Amendment No. 1 to Registration  Statement to be
signed on its behalf by the undersigned,  thereunto duly authorized, in the City
of Rockville, State of Maryland, on the 22nd day of January, 1997.

                                    ORIONNET, INC.                         
                                    By: /s/ W. Neil Bauer
                                        -----------------------------------
                                         W. Neil Bauer                          
                                         President and Chief Executive Officer  
                                        
   Pursuant to the requirements of the Securities Act of 1933, as amended,  this
Registration  Statement  has been signed below by the  following  persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
       SIGNATURE                         TITLE                        DATE
- -----------------------  ------------------------------------ -----------------
<S>                      <C>                                  <C>
                         
/s/ W. Neil Bauer       President, Chief Executive          January 22, 1997  
- -----------------------    Officer and Director                                 
W. Neil Bauer              (Principal Executive Officer)        
                         
                         
                         
/s/ David J. Frear      Vice President, Chief Financial      January 22, 1997 
- -----------------------    Officer and Director                                 
David J. Frear             (Principal Financial Officer                         
                           and Principal Accounting                             
                           Officer)                             

</TABLE>

                      
*By: /s/ David J. Frear
    ------------------------
          David J. Frear
         Attorney-in-Fact


                                      II-20

<PAGE>


                                  SIGNATURES


   Pursuant to the  requirements of the Securities Act of 1933, as amended,  the
Registrant has duly caused this Amendment No. 1 to Registration  Statement to be
signed on its behalf by the undersigned,  thereunto duly authorized, in the City
of Rockville, State of Maryland, on the 22nd day of January, 1997.

                                   ORION ASIA PACIFIC CORPORATION         
                                   By: /s/ W. Neil Bauer
                                      -----------------------------------
                                        W. Neil Bauer                          
                                        President and Chief Executive Officer  
                                   
   Pursuant to the requirements of the Securities Act of 1933, as amended,  this
Amendment No. 1 to Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
       SIGNATURE                         TITLE                        DATE
- -----------------------  ------------------------------------ -----------------
<S>                      <C>                                  <C>
                         
/s/ W. Neil Bauer       President, Chief Executive          January 22, 1997  
- -----------------------    Officer and Director                                 
W. Neil Bauer              (Principal Executive Officer)        
                         
                         
                         
/s/ David J. Frear      Vice President, Chief Financial      January 22, 1997 
- -----------------------    Officer and Treasurer and 
David J. Frear             Director (Principal Financial                          
                           Officer and Principal Accounting                             
                           Officer)                             

</TABLE>

                      
*By: /s/ David J. Frear
    ------------------------
          David J. Frear
         Attorney-in-Fact


                                      II-21

<PAGE>



                                  SIGNATURES


   Pursuant to the  requirements of the Securities Act of 1933, as amended,  the
Registrant has duly caused this Amendment No. 1 to Registration  Statement to be
signed on its behalf by the undersigned,  thereunto duly authorized, in the City
of Rockville, State of Maryland, on the 22nd day of January, 1997.

                                   ASIA PACIFIC SPACE AND                 
                                   COMMUNICATIONS, INC.                   
                                   By: /s/ W. Neil Bauer                 
                                       ---------------------------------
                                        W. Neil Bauer                          
                                        President and Chief Executive Officer  
                                   
   Pursuant to the requirements of the Securities Act of 1933, as amended,  this
Amendment No. 1 to Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
       SIGNATURE                         TITLE                        DATE
- -----------------------  ------------------------------------ -----------------
<S>                      <C>                                  <C>
                         
/s/ W. Neil Bauer       President, Chief Executive          January 22, 1997  
- -----------------------    Officer and Director                                 
W. Neil Bauer              (Principal Executive Officer)        
                         
                         
                         
/s/ David J. Frear      Vice President, Chief Financial      January 22, 1997 
- -----------------------    Officer and Director                                 
David J. Frear             (Principal Financial Officer                         
                           and Principal Accounting                             
                           Officer)                             

</TABLE>

                      
*By: /s/ David J. Frear
    ------------------------
          David J. Frear
         Attorney-in-Fact


                                      II-22

<PAGE>




                                  SIGNATURES


   Pursuant to the  requirements of the Securities Act of 1933, as amended,  the
Registrant has duly caused this Amendment No. 1 to Registration  Statement to be
signed on its behalf by the undersigned,  thereunto duly authorized, in the City
of Rockville, State of Maryland, on the 22nd day of January, 1997.

                                   ORIONNET FINANCE CORPORATION          
                                   By: /s/ W. Neil Bauer                
                                       ------------------------------------
                                        W. Neil Bauer                         
                                        President and Chief Executive Officer 
                                   
   Pursuant to the requirements of the Securities Act of 1933, as amended,  this
Amendment No. 1 to Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
       SIGNATURE                         TITLE                        DATE
- -----------------------  ------------------------------------ -----------------
<S>                      <C>                                  <C>
                         
/s/ W. Neil Bauer       President, Chief Executive          January 22, 1997  
- -----------------------    Officer and Director                                 
W. Neil Bauer              (Principal Executive Officer)        
                         
                         
                         
/s/ David J. Frear      Vice President, Chief Financial      January 22, 1997 
- -----------------------    Officer and Treasurer and 
David J. Frear             Director (Principal Financial                      
                           Officer and Principal Accounting                   
                           Officer)                             

</TABLE>

*By: /s/ David J. Frear
     ----------------------
           David J. Frear
          Attorney-in-Fact


                                      II-23

<PAGE>



                                  SIGNATURES


   Pursuant to the  requirements of the Securities Act of 1933, as amended,  the
Registrant has duly caused this Amendment No. 1 to Registration  Statement to be
signed on its behalf by the undersigned,  thereunto duly authorized, in the City
of Rockville, State of Maryland, on the 22nd day of January, 1997.

                                   ORION ATLANTIC EUROPE, INC.           
                                   By: /s/ W. Neil Bauer                
                                       --------------------------------
                                        W. Neil Bauer                         
                                        President and Chief Executive Officer 
                                   
   Pursuant to the requirements of the Securities Act of 1933, as amended,  this
Amendment No. 1 to Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.



<TABLE>
<CAPTION>
       SIGNATURE                         TITLE                        DATE
- -----------------------  ------------------------------------ -----------------
<S>                      <C>                                  <C>
                         
/s/ W. Neil Bauer       President, Chief Executive          January 22, 1997  
- -----------------------    Officer and Director                                 
W. Neil Bauer              (Principal Executive Officer)        
                         
                         
                         
/s/ David J. Frear      Vice President, Chief Financial      January 22, 1997 
- -----------------------    Officer and Treasurer and 
David J. Frear             Director (Principal Financial                      
                           Officer and Principal Accounting                   
                           Officer)                             

</TABLE>

*By: /s/ David J. Frear
     ----------------------
           David J. Frear
          Attorney-in-Fact


                                      II-24

<PAGE>

                                EXHIBIT INDEX

<TABLE>
<CAPTION>
  EXHIBIT                                                                                                              PAGE
   NUMBER                                                 DESCRIPTION                                                 NUMBER
- -----------  ----------------------------------------------------------------------------------------------------- -----------
<S>            <C>
   
1.1            Form of Underwriting Agreement
2.1            Agreement and Plan of Merger, dated January 8, 1997, by and among
               Orion Network Systems, Inc., Orion Newco Services, Inc. and Orion
               Merger Company, Inc. (Incorporated by reference to exhibit number
               2.1 in Registration  Statement No. 333-19795 on Form S-4 of Orion
               Newco Services, Inc.)
3.1            Form of  Restated  Certificate  of  Incorporation  of Orion Newco
               Services,  Inc.  (Incorporated by reference to exhibit number 3.1
               in  Registration  Statement  No.  333-19795  on Form S-4 of Orion
               Newco Services,  Inc.)

    
   
3.2            Bylaws of Orion Newco Services,  Inc.  (Incorporated by reference
               to exhibit number 3.2 in Registration  Statement No. 333-19795 on
               Form S-4 of Orion Newco Services, Inc.)
    
3.3            Certificate  of  Incorporation  of Orion  Network  Systems,  Inc.
               (Incorporated  by reference to exhibit number 3.1 in Registration
               Statement  No.  33-80518  on Form S-1 of Orion  Network  Systems,
               Inc.)
3.4            Bylaws of Orion Network Systems, Inc.  (Incorporated by reference
               to exhibit number 3.2 in  Registration  Statement No. 33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
3.5            Certificate of Incorporation of Orion Satellite Corporation
3.6            Bylaws of Orion Satellite Corporation
3.7            Certificate  of  Limited  Partnership  of  International  Private
               Satellite Partners, L.P.
3.8            Form  of  Third   Amended  and  Restated   Agreement  of  Limited
               Partnership of International Private Satellite Partners, L.P.
3.9            Certificate of Incorporation of OrionNet, Inc.
3.10           Bylaws of OrionNet, Inc.
3.11           Certificate of Incorporation of Orion Asia Pacific Corporation*
3.12           Bylaws of Orion Asia Pacific Corporation
3.13           Certificate of Incorporation OrionNet Finance Corporation
3.14           Bylaws of OrionNet Finance Corporation
3.15           Certificate   of   Incorporation   of  Asia  Pacific   Space  and
               Communications, Ltd.
   
3.16           Amended  and   Restated   Bylaws  of  Asia   Pacific   Space  and
               Communications, Ltd.
3.17           Certificate of Incorporation of Orion Atlantic Europe, Inc.
3.18           Bylaws of Orion Atlantic Europe, Inc.
4.1            Form of Senior Note Indenture and Form of Note included therein
4.2            Form of Senior  Discount Note Indenture and Form of Note included
               therein
4.3            Form of  Collateral Pledge and Security Agreement
4.4            INTENTIONALLY OMITTED
4.5            Form of Warrant Agreement, by and between Orion and Bankers Trust
               Company, and Form of Warrant included therein     
4.6            Forms of Warrant issued by Orion.  (Incorporated  by reference to
               exhibit number 4.1 in Registration Statement No. 33-80518 on Form
               S-1 of Orion Network Systems, Inc.)
4.7            Forms of Warrant  issued by Orion to holders of Preferred  Stock.
               (Incorporated  by reference to exhibit number 4.2 in Registration
               Statement  No.  33-80518  on Form S-1 of Orion  Network  Systems,
               Inc.)
4.8            Forms of  Certificates  of  Designation of Series A 8% Cumulative
               Redeemable  Convertible  Preferred Stock,  Series B 8% Cumulative
               Redeemable Convertible Preferred Stock and Series C 6% Cumulative
               Redeemable Convertible Preferred Stock of Orion. (Incorporated by
               reference to exhibit  number 4.3 in  Registration  Statement  No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)


<PAGE>

  EXHIBIT                                                                                                              PAGE
   NUMBER                                                 DESCRIPTION                                                 NUMBER
- -----------  ----------------------------------------------------------------------------------------------------- -----------
4.9            Forms of Series A Preferred  Stock,  Series B Preferred Stock and
               Series C Preferred Stock certificates of Orion.  (Incorporated by
               reference to exhibit  number 4.4 in  Registration  Statement  No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
4.10           Form of  Common  Stock  Certificate  of Orion.  (Incorporated  by
               reference to exhibit  number 4.5 in  Registration  Statement  No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
4.11           Forms of  Certificates  of  Designation of Series A 8% Cumulative
               Redeemable Convertible Preferred Stock and Series B 8% Cumulative
               Redeemable  Convertible Preferred Stock of Orion Network Systems,
               Inc.   (Incorporated  by  reference  to  exhibit  number  4.4  in
               Registration Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.).
4.12            Form of Warrant issued to DACOM Corp.  (Incorporated by reference
               to exhibit number 4.6 in Registration  Statement No. 333-19795 on
               Form S-4 of Orion Newco Services, Inc.)
4.13           Debenture  Purchase  Agreement,  dated  January  13,  1997,  with
               British  Aerospace  and  Matra  Marconi  Space  (Incorporated  by
               reference to exhibit  number 4.7 in  Registration  Statement  No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
5.1            Opinion of Hogan & Hartson L.L.P.*
   
8.1            Opinion of Hogan & Hartson  L.L.P.  with  respect to certain  tax
               matters*    
10.1           Second Amended and Restated Purchase  Agreement,  dated September
               26,  1991  ("Satellite  Contract")  by and between  OrionSat  and
               British  Aerospace  PLC  and the  First  Amendment,  dated  as of
               September  15, 1992,  Second  Amendment,  dated as of November 9,
               1992,  Third  Amendment,  dated  as of  March  12,  1993,  Fourth
               Amendment,  dated as of April 15, 1993, Fifth Amendment, dated as
               of September  22,  1993,  Sixth  Amendment,  dated as of April 6,
               1994,  Seventh  Amendment,  dated as of  August 9,  1994,  Eighth
               Amendment,  dated as of December  8, 1994,  and  Amendment  No. 9
               dated October 24, 1995, thereto. [CONFIDENTIAL TREATMENT HAS BEEN
               GRANTED  FOR  PORTIONS  OF  THESE  DOCUMENTS.]  (Incorporated  by
               reference  to  exhibits  number  10.13 and 10.14 in  Registration
               Statement  No.  33-80518  on Form S-1 of Orion  Network  Systems,
               Inc.)
10.2           Restated  Amendment No. 10 dated December 10, 1996, between Orion
               Atlantic  and  Matra  Marconi  Space to the  Second  Amended  and
               Restated  Purchase  Agreement,  dated  September  26, 1991 by and
               between  OrionSat and British  Aerospace PLC (which  contract and
               prior exhibits thereto were  incorporated by reference as exhibit
               number 10.1).  (Incorporated  by reference to exhibit number 10.2
               in  Registration  Statement  No.  333-19795  on Form S-4 of Orion
               Newco Services, Inc.)
10.3           Ground Support System  Agreement,  dated as of August 2, 1991, by
               and between Orion  Atlantic and Telespazio  S.p.A.  [CONFIDENTIAL
               TREATMENT  HAS  BEEN  GRANTED  FOR  PORTIONS  OF THIS  DOCUMENT.]
               (Incorporated   by   reference   to  exhibit   number   10.25  in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.)
10.4           Italian  Facility and Services  Agreement,  dated as of August 2,
               1991, by and between OrionSat and Telespazio S.p.A. as amended by
               the  amendment  thereto,  dated  March  19,  1994.  [CONFIDENTIAL
               TREATMENT  HAS BEEN  GRANTED FOR  PORTIONS  OF THESE  DOCUMENTS.]
               (Incorporated   by   reference   to  exhibit   number   10.26  in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.)
10.5           Contract for a Satellite Control System,  dated December 7, 1992,
               by and  between  Orion  Atlantic,  Telespazio  S.p.A.  and Martin
               Marietta  Corporation.  [CONFIDENTIAL  TREATMENT HAS BEEN GRANTED
               FOR  PORTIONS OF THIS  DOCUMENT.]  (Incorporated  by reference to
               exhibit number 10.31 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.6           Credit  Agreement,  dated as of November 23, 1993, by and between
               Orion Atlantic, OrionSat and General Electric Capital Corporation
               ("GECC").  [CONFIDENTIAL  TREATMENT HAS BEEN GRANTED FOR PORTIONS
               OF THIS DOCUMENT.]  (Incorporated  by reference to exhibit number
               10.32 in Registration Statement No. 33-80518 on Form S-1 of Orion
               Network Systems, Inc.)

<PAGE>

  EXHIBIT                                                                                                              PAGE
   NUMBER                                                 DESCRIPTION                                                 NUMBER
- -----------  ----------------------------------------------------------------------------------------------------- -----------
10.7           Security Agreement, dated as of November 23, 1993, by and between
               Orion Atlantic,  OrionSat and GECC. (Incorporated by reference to
               exhibit number 10.33 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.8           Assignment and Security Agreement, dated as of November 23, 1993,
               by and between Orion Atlantic,  OrionSat and GECC.  (Incorporated
               by reference to exhibit  number 10.34 in  Registration  Statement
               No. 33-80518 on Form S-1 of Orion Network Systems, Inc.)
10.9           Consent and  Agreement,  dated as of November  23,  1993,  by and
               between Orion  Atlantic,  Martin  Marietta  Corporation and GECC.
               (Incorporated   by   reference   to  exhibit   number   10.35  in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.) 
   
10.10          Deed of Trust,  dated as of  November  23,  1993,  by and between
               Orion  Atlantic,  W. Allen Ames,  Jr. and Michael J.  Schwel,  as
               Trustees, and GECC.  (Incorporated by reference to exhibit number
               10.37 in Registration Statement No. 33-80518 on Form S-1 of Orion
               Network Systems, Inc.)
10.11          Lease  Agreement,  dated as of November 23, 1993,  by and between
               OrionNet,  Inc. and Orion  Atlantic,  as amended by an Amendment,
               dated January 3, 1995.  [CONFIDENTIAL  TREATMENT HAS BEEN GRANTED
               FOR PORTIONS OF THESE  DOCUMENTS.]  (Incorporated by reference to
               exhibit number 10.38 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)    
10.12          Note for Interim  Loans,  dated as of November 23,  1993,  by and
               between Orion  Atlantic and GECC.  (Incorporated  by reference to
               exhibit number 10.42 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network
               Systems, Inc.)
10.13          Sales  Representation  Agreement  and Ground  Operations  Service
               Agreement, each dated as of May 1, 1994 and June 30, 1994, by and
               between  each of  OrionNet,  Inc.  and  Kingston  Communications,
               respectively,  and Orion Atlantic, as amended by side agreements,
               dated  May  1,  1994,   July  12,  1994  and  February  1,  1995.
               [CONFIDENTIAL  TREATMENT  HAS BEEN  GRANTED FOR PORTIONS OF THESE
               DOCUMENTS.] (Incorporated by reference to exhibit number 10.43 in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.)
   
10.14          Lease  Agreement,  dated as of October 2,  1992,  by and  between
               OrionNet and Research Grove  Associates,  as amended by Amendment
               No. 1, dated March 26,  1993,  Amendment  No. 2, dated August 23,
               1993, and Amendment No. 3, dated December 20, 1993. (Incorporated
               by reference to exhibit  number 10.39 in  Registration  Statement
               No.  33-80518  on  Form  S-1  of  Orion  Network  Systems,  Inc.)
10.15          Sales  Representation  Agreement  and Ground  Operations  Service
               Agreement,  dated as of June 30,  1995,  by and  between  MCN Sat
               Service,  S.A. and Orion  Atlantic.  [CONFIDENTIAL  TREATMENT HAS
               BEEN GRANTED FOR  PORTIONS OF THIS  DOCUMENT.]  (Incorporated  by
               reference  to  exhibit  number  10.69  in  Orion's   Registration
               Statement No. 33-80518 on Form S-1.)    
10.16          Volume Purchase Agreement, dated January 18, 1995, by and between
               the Company and Dornier  GmbH.  [CONFIDENTIAL  TREATMENT HAS BEEN
               GRANTED  FOR  PORTIONS  OF  THIS  DOCUMENT.]   (Incorporated   by
               reference to exhibit number 10.66 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)
10.17          Product  Development,  License  and  Marketing  Agreement,  dated
               January 18,  1995,  by and between the Company and Dornier  GmbH.
               [CONFIDENTIAL  TREATMENT  HAS BEEN  GRANTED FOR  PORTIONS OF THIS
               DOCUMENT.]  (Incorporated by reference to exhibit number 10.65 in
               Orion's Registration Statement No. 33-80518 on Form S-1.)
10.18          Sales Representation Agreement,  dated as of June 8, 1995, by and
               between  Nortel  Dasa  Network  Systems  GmbH & Co.  KG and Orion
               Atlantic.  [CONFIDENTIAL  TREATMENT HAS BEEN GRANTED FOR PORTIONS
               OF THIS DOCUMENT.]  (Incorporated  by reference to exhibit number
               10.70 in Registration Statement No. 33-80518 on Form S-1 of Orion
               Network Systems, Inc.)
10.19          Orion 2  Spacecraft  Purchase  Contract,  dated  July  31,  1996,
               between  Orion  Atlantic and Matra Marconi  Space.  [CONFIDENTIAL
               TREATMENT  HAS  BEEN  GRANTED  FOR  PORTIONS  OF THIS  DOCUMENT.]
               (Incorporated   by   reference   to  exhibit   number   10.19  in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)

<PAGE>

  EXHIBIT                                                                                                              PAGE
   NUMBER                                                 DESCRIPTION                                                 NUMBER
- -----------  ----------------------------------------------------------------------------------------------------- -----------

10.20          Orion's  Amended and Restated  1987 Stock Option Plan as amended.
               (Incorporated   by   reference   to  exhibit   number   10.23  in
               Registration  Statement No. 33-80518 on Form S-1 of Orion Network
               Systems, Inc.)
10.21          Purchase  Contract,  dated  December  4,  1991,  by  and  between
               OrionNet,   Inc.,  Shenandoah  Valley  Leasing  Company  and  MCI
               Telecommunications Corporation.  [CONFIDENTIAL TREATMENT HAS BEEN
               GRANTED FOR PORTION OF THIS DOCUMENT.] (Incorporated by reference
               to exhibit number 10.30 in Registration Statement No. 33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.22          Amended and Restated  Partnership  Agreement  of Orion  Financial
               Partnership,  dated as of April 15, 1994, by and between OrionNet
               and Computer Leasing Inc. ("CLI").  (Incorporated by reference to
               exhibit number 10.44 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.23          Continuing  Guaranty,  dated as of April 15, 1994, of the Company
               of the obligations of OrionNet Finance Corporation. (Incorporated
               by reference to exhibit  number 10.45 in  Registration  Statement
               No. 33-80518 on Form S-1 of Orion Network Systems, Inc.)
10.24          Release of Continuing Guaranty, dated as of December 29, 1994, by
               the Orion Financial  Partnership.  (Incorporated  by reference to
               exhibit number 10.46 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.25          Confirmation  of  Continuing  Guaranty,  dated as of December 29,
               1994, of the Company of the obligation of OFC.  (Incorporated  by
               reference to exhibit number 10.47 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)
10.26          Continuing  Guarantee,  dated as of December 29, 1994,  by Lessor
               Capital Funding  Limited  Partnership in favor of Orion Financial
               Partnership.  (Incorporated  by reference to exhibit number 10.48
               in  Registration  Statement  No.  33-80518  on Form  S-1 of Orion
               Network Systems,  Inc.) 10.27Master Lease Agreement,  dated as of
               April 15,  1994,  by and  between  OrionNet  and Orion  Financial
               Partnership.  (Incorporated  by reference to exhibit number 10.49
               in  Registration  Statement  No.  33-80518  on Form  S-1 of Orion
               Network Systems, Inc.)
10.28          Collateral  Assignment and Pledge and Security  Agreement,  dated
               April  22,  1994,   by  and  between  CLI  and  Orion   Financial
               Partnership.  (Incorporated  by reference to exhibit number 10.50
               in  Registration  Statement  No.  33-80518  on Form  S-1 of Orion
               Network Systems, Inc.)
10.29          Purchase  Agreement,  dated as of April 22, 1994,  by and between
               OrionNet  and  Orion  Financial  Partnership.   (Incorporated  by
               reference to exhibit number 10.51 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)
10.30          Stock  Purchase  Agreement,  dated as of April 29,  1994,  by and
               between the  Company  and SS/L.  (Incorporated  by  reference  to
               exhibit number 10.53 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.31          Registration Rights Agreement, dated as of April 29, 1994, by and
               between the  Company  and SS/L.  (Incorporated  by  reference  to
               exhibit number 10.54 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.32          Purchase Agreement, dated as of June 17, 1994, by and between the
               Company, CIBC, Fleet and Chisholm.  (Incorporated by reference to
               exhibit number 10.55 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.)
10.33          Stockholders Agreement, dated as of June 17, 1994, by and between
               the  Company,   CIBC,  Fleet,   Chisholm  and  certain  principal
               stockholders  of  the  Company.  (Incorporated  by  reference  to
               exhibit number 10.56 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.) 10.34Registration Rights
               Agreement, dated as of June 17, 1994, by and between the Company,
               CIBC,  Fleet and Chisholm.  (Incorporated by reference to exhibit
               number 10.57 in  Registration  Statement No. 33-80518 on Form S-1
               of Orion Network Systems, Inc.)
10.35          Purchase  Agreement,  dated as of June 19, 1995, by and among the
               Company, CIBC, Fleet and an affiliate of Fleet.  (Incorporated by
               reference to exhibit number 10.58 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)

<PAGE>


  EXHIBIT                                                                                                              PAGE
   NUMBER                                                 DESCRIPTION                                                 NUMBER
- -----------  ----------------------------------------------------------------------------------------------------- -----------
10.36          Definitive Agreement,  dated April 26, 1990, by and between Orion
               Asia Pacific and the Republic of the Marshall Islands and a Stock
               Option  Agreement  related thereto.  [CONFIDENTIAL  TREATMENT HAS
               BEEN GRANTED FOR PORTIONS OF THESE  DOCUMENTS.]  (Incorporated by
               reference to exhibit number 10.60 in  Registration  Statement No.
               33-80518 on Form S-1 of Orion Network Systems, Inc.)
   
10.37          Option  Agreement,  dated December 10, 1996, by and between Orion
               Atlantic and Matra  Marconi  Space.  [CONFIDENTIAL  TREATMENT HAS
               BEEN GRANTED FOR PORTIONS OF THIS DOCUMENT.]  (Incorporated  by
               reference to exhibit number 10.37 in  Registration  Statement No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
10.38          Memorandum   of  Agreement  for  the   Procurement   of  Orion  2
               Spacecraft,  dated  December  19,  1996,  by  and  between  Orion
               Atlantic and Matra  Marconi  Space.  [CONFIDENTIAL  TREATMENT HAS
               BEEN GRANTED FOR PORTIONS OF THIS DOCUMENT.]  (Incorporated  by
               reference to exhibit number 10.38 in  Registration  Statement No.
               333-19795 on Form S-4 of Orion Newco Services, Inc.)
10.39          TT&C Earth Station  Agreement,  dated as of November 11, 1996, by
               and between  Orion Asia  Pacific  and DACOM  Corp.  [CONFIDENTIAL
               TREATMENT  HAS BEEN  GRANTED  FOR  PORTIONS OF THIS  DOCUMENT.]
               (Incorporated   by   reference   to  exhibit   number   10.39  in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)
10.40          Joint Investment Agreement, dated as of November 11, 1996, by and
               between   Orion  Asia  Pacific  and  DACOM  Corp.   [CONFIDENTIAL
               TREATMENT  HAS BEEN  GRANTED  FOR  PORTIONS OF THIS  DOCUMENT.]
               (Incorporated   by   reference   to  exhibit   number   10.40  in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)    
10.41          Orion  Network  Systems,   Inc.   Employee  Stock  Purchase  Plan
               (Incorporated  by reference to exhibit number 4.4 in Registration
               Statement  No.  333-19021 on Form S-8 of Orion  Network  Systems,
               Inc.)
10.42          Orion  Network   Systems,   Inc.   401(k)  Profit   Sharing  Plan
               (Incorporated  by reference to exhibit number 4.5 in Registration
               Statement  No.  333-19021 on Form S-8 of Orion  Network  Systems,
               Inc.)
10.43          Orion Network Systems,  Inc.  Non-Employee  Director Stock Option
               Plan  (Incorporated  by  reference  to  exhibit  number  10.43 in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)
10.44          Exchange  Agreement dated June 1996 among Orion Network  Systems,
               Orion Atlantic,  OrionSat and the Limited Partners  (Incorporated
               by  reference  to exhibit 10 in Current  Report on Form 8-K dated
               December 20, 1996, of
               Orion Network Systems, Inc.)
   
10.45          First  Amendment to Exchange  Agreement dated December 1996 among
               Orion Network Systems,  Orion Atlantic,  OrionSat and the Limited
               Partners.  (Incorporated  by reference to exhibit number 10.45 in
               Registration  Statement No.  333-19795 on Form S-4 of Orion Newco
               Services, Inc.)    
10.46          Redemption Agreement dated November 21, 1995, by and between STET
               and Orion Atlantic, the promissory notes delivered thereunder and
               Instrument  of  Redemption  relating  thereto.  (Incorporated  by
               reference  to exhibit  number 10.1 in Current  Report on Form 8-K
               dated November 21, 1995 of Orion Network Systems, Inc.)
10.47          IPSP-Telecom  Italia  Agreement  dated  November 21, 1995, by and
               between   Telecom  Italia  and  Orion   Atlantic.   [CONFIDENTIAL
               TREATMENT  HAS  BEEN  GRANTED  FOR  PORTIONS  OF THIS  DOCUMENT.]
               (Incorporated  by  reference  to exhibit  number  10.2 in Current
               Report  on Form 8-K  dated  November  21,  1995 of Orion  Network
               Systems, Inc.)
10.48          Indemnity Agreement dated November 21, 1995, by and among Telecom
               Italia,  Orion  Atlantic,   Orion  and  STET.   (Incorporated  by
               reference  to exhibit  number 10.3 in Current  Report on Form 8-K
               dated November 21, 1995 of Orion Network Systems, Inc.)


<PAGE>

  EXHIBIT                                                                                                              PAGE
   NUMBER                                                 DESCRIPTION                                                 NUMBER
- -----------  ----------------------------------------------------------------------------------------------------- -----------
10.49          Subscription  Agreement  dated  November 21, 1995, by and between
               Orion and  Orion  Atlantic,  and the  promissory  note  delivered
               thereunder.  (Incorporated by reference to exhibit number 10.5 in
               Current  Report  on Form 8-K  dated  November  21,  1995 of Orion
               Network Systems, Inc.).
10.50           First  Amendment to the Italian Facility and Services  Agreement
               dated  November 21, 1995, by and between Orion Atlantic and Nuova
               Telespazio.  (Incorporated by reference to exhibit number 10.7 in
               Current  Report  on Form 8-K  dated  November  21,  1995 of Orion
               Network Systems, Inc.).
10.51          Registration  Rights  Agreement,  dated  January 13, 1997, by and
               among Orion Newco Services,  Inc.,  British  Aerospace  Holdings,
               Inc.  and Matra  Marconi  Space.  (Incorporated  by  reference to
               exhibit number 10.51 in Registration  Statement No.  333-19795 on
               Form S-4 of Orion Newco Services, Inc.)
   
10.52          Orion 3 Spacecraft Purchase Contract,  dated January 15, 1997, by
               and among Hughes Space and  Communications  International,  Inc.,
               Orion  Asia  Pacific   Corporation  and  Orion  Network  Systems.
               {CONFIDENTIAL  TREATMENT HAS BEEN  REQUESTED FOR PORTIONS OF THIS
               DOCUMENT.  THE CONFIDENTIAL PORTIONS HAVE BEEN REDACTED AND FILED
               SEPARTELY WITH THE COMMISSION.]*
12.1           Statement  Regarding  Computation  of Ratio of  Earnings to Fixed
               Charges.
21.1           List of  subsidiaries  of Orion.  (Incorporated  by references to
               exhibit number 21.1 in  Registration  Statement No.  333-19795 on
               Form S-4 of Orion Newco Services, Inc.)
23.1           Consent of Ernst & Young LLP
23.2           Consent  of Hogan & Hartson  L.L.P.  (included  in their  opinion
               filed as Exhibit 5.1).*
23.3           Consent of Ascent Communications Advisors, L.P.
24.1           Powers  of  Attorney  (included  on the  signature  pages  of the
               Registration Statement).
26.1           Form T-1 Statement of  Eligibility  and  Qualification  under the
               Trust  Indenture Act of 1939, as amended of Bankers Trust Company                      
               as trustee (Separately Bound)*
99.1           Orders of FCC regarding  OrionSat.  (Incorporated by reference to
               exhibit  number 99.1 in  Registration  Statement No.  33-80518 on
               Form S-1 of Orion Network Systems, Inc.).
99.2           Valuation  for Orion  Atlantic as of December 1, 1996,  by Ascent
               Communications  Advisors, L.P.  (Included as Attachement A to the
               Prospectus which is a part of this Registration Statement.)    


- ----------
   * To be filed by amendment.
</TABLE>

                                                                     S&S DRAFT
                                                                       1/20/97





                           ORION NETWORK SYSTEMS, INC.
                           ORION NEWCO SERVICES, INC.


                     [_____] Units, each Unit consisting of
                           One % Senior Note Due 2007
           and One Warrant to Purchase [______] Shares of Common Stock



                     [_____] Units, each Unit consisting of
                       One % Senior Discount Note Due 2007
           and One Warrant to Purchase [______] Shares of Common Stock







                           UNDERWRITING AGREEMENT






                           [__________], 1997


<PAGE>



                                                              [__________], 1997


Morgan Stanley  &  Co. Incorporated
Merrill Lynch, Pierce, Fenner & Smith, Incorporated

c/o Morgan Stanley & Co.
          Incorporated
     1585 Broadway
     New York, New York 10036

Dear Sirs:

                  Orion  Newco   Services,   Inc.,  a  newly   formed   Delaware
corporation  ("Newco")  that is a  wholly  owned  subsidiary  of  Orion  Network
Systems,  Inc., a Delaware  corporation  (collectively,  with its successors and
assigns,  "Orion"),  proposes  to issue  and sell to the  Underwriters  named in
Schedule I hereto (the "Underwriters")  [_____] Senior Note Units (collectively,
the "Senior Note Units") and [_____] Senior  Discount Note Units  (collectively,
the "Senior  Discount Note Units";  and together with the Senior Note Units, the
"Units").  Each Senior Note Unit will consist of (i) one [____]% Senior Note due
2007 with a principal amount of $1,000 (collectively,  the "Senior Notes") to be
issued  pursuant to the  provisions of a Senior Note Indenture (the "Senior Note
Indenture") to be dated as of the Closing Date (as defined below) between Newco,
certain  subsidiaries  of Orion, as guarantors  (the  "Guarantors")  and Bankers
Trust Company, as trustee (the "Trustee") and (ii) a Warrant (collectively,  the
"Warrants"),  each Warrant  entitling  the holder  thereof to purchase  [______]
shares of Common Stock, par value $.01 per share (the "Common Stock"), of Newco,
to be issued pursuant to the provisions of a Warrant Agreement to be dated as of
the Closing  Date (the  "Warrant  Agreement")  between  Newco and Bankers  Trust
Company, as warrant agent (the "Warrant Agent").  Each Senior Discount Note Unit
will consist of (i) one [___]%  Senior  Unsecured  Discount Note due 2007 with a
principal  amount at maturity  of $1,000  (collectively,  the  "Senior  Discount
Notes";  and together with the Senior Notes,  the "Notes") to be issued pursuant
to the  provisions  of a Senior  Discount  Note  Indenture to be dated as of the
Closing  Date  (the  "Senior  Discount  Note  Indenture")   between  Newco,  the
Guarantors,  as  guarantors,  and Bankers Trust  Company,  as trustee and (ii) a
Warrant.

                  Pursuant  to the Section 351  Exchange  Agreement  and Plan of
Conversion  dated as of June [__],  1996, and amended as of December [__], 1996,
(as amended,  the  "Exchange  Agreement"),  among Orion,  International  Private
Satellite  Partners,  L.P., a Delaware limited  partnership  ("Orion Atlantic"),
Orion  Satellite  Corporation,  a Delaware  corporation  ("OrionSat")  that is a
wholly owned subsidiary of Orion and the sole general partner of Orion Atlantic,
and each of the existing  limited  partners of Orion  Atlantic  other than Orion
(the  "Exchanging  Partners"),  the Exchanging  Partners have agreed to transfer
their limited partnership  interests in Orion Atlantic and other rights relating
thereto to Newco in exchange  (collectively,  the "Exchange") for 121,988 shares
of  a  newly  created  class  of  Newco's  Series  C 6%  Cumulative  Convertible
Redeemable  Preferred Stock. Upon  consummation of the Exchange,  Newco will own
all of the  limited  partnership  interests  in  Orion  Atlantic  (directly  and
indirectly  through Orion). In addition,  Newco will acquire certain rights held
by certain  of the  Exchanging  Partners,  including  certain of the  Exchanging
Partners' rights to receive repayment of various advances.  Simultaneously  with
the Exchange,  under an Agreement and Plan of Merger dated as of January 8, 1997
(the "Merger Agreement"),  among Orion, Newco and Orion Merger Company,  Inc., a
newly formed  Delaware  corporation  that is a wholly owned  subsidiary of Newco
("Merger  Sub"),  Orion  will  merge  with and  into  Merger  Sub in a  tax-free
reorganization  (the "Merger").  Orion will be the surviving  corporation in the
Merger and will thereby  become the wholly owned  subsidiary  of Newco,  and the
holders of  preferred  and  common  stock of Orion  will  receive  substantially
identical  preferred  and  common  stock of Newco in  exchange  for such  stock.
Effective upon  consummation of the Merger,  Newco will change its name to Orion
Network  System,  Inc. and Orion will change its name to __________.  The Merger
and the Exchange will close concurrently with the closing of the offering of the
Units (the "Offering").

                  Newco has filed with the  Securities  and Exchange  Commission
(the "Commission") a registration statement, including a prospectus, relating to
the Units,  Notes,  Warrants  and Common Stock  underlying  the  Warrants.*  The
registration  statement as amended at the time it becomes  effective,  including
the  exhibits  thereto  and the  information  (if any)  deemed to be part of the
registration  statement at the time of effectiveness pursuant to Rule 430A under
the Securities Act of 1933 (the "Securities Act"), is hereinafter referred to as
the "Original Registration Statement;" any registration statement filed pursuant
to Rule 462(b) under the Securities Act is hereinafter  referred to as the "Rule
462(b) Registration Statement;" the Original Registration Statement and any Rule
462(b)  Registration  Statement are hereinafter  referred to collectively as the
"Registration  Statement;"  and the prospectus in the form first used to confirm
sales of Units is hereinafter referred to as the "Prospectus."


                                       I.

                  Each of Orion and Newco  (collectively,  the "Orion Entities")
jointly and severally represents and warrants to each of the Underwriters that:

                  (a) The Original  Registration  Statement has become effective
         and, if Newco has elected to rely upon Rule 462(b) under the Securities
         Act, the Rule 462(b) Registration Statement shall have become effective
         not later than the earlier of (i) 10:00 p.m.  Eastern  time on the date
         hereof and (ii) the time  confirmations are sent or given, as specified
         by Rule 462(b)(2)  under the Securities  Act; no stop order  suspending
         the  effectiveness of the Registration  Statement is in effect,  and no
         proceedings  for such purpose are pending  before or  threatened by the
         Commission.

                  (b) (i) Each  part of the  Registration  Statement,  when such
         part became  effective,  did not contain and each such part, as amended
         or supplemented,  if applicable,  will not contain any untrue statement
         of a material  fact or omit to state a  material  fact  required  to be
         stated  therein  or  necessary  to  make  the  statements  therein  not
         misleading,  (ii) the Registration  Statement and the Prospectus comply
         and,  as amended or  supplemented,  if  applicable,  will comply in all
         material  respects with the Securities Act and the applicable rules and
         regulations of the Commission  thereunder and (iii) the Prospectus does
         not contain and, as amended or  supplemented,  if applicable,  will not
         contain  any untrue  statement  of a  material  fact or omit to state a
         material fact necessary to make the statements therein, in light of the
         circumstances  under which they were made, not misleading,  except that
         the  representations and warranties set forth in this paragraph I(b) do
         not apply (A) to statements or omissions in the Registration  Statement
         or the Prospectus  based upon  information  relating to any Underwriter
         furnished  to  either  of  the  Orion   Entities  in  writing  by  such
         Underwriter  expressly  for  use  therein  or (B) to  that  part of the
         Registration  Statement that  constitutes  the Statement of Eligibility
         and Qualification  (Form T-1) under the Trust Indenture Act of 1939, as
         amended (the "Trust Indenture Act"), of each of the Senior Note Trustee
         and the Senior Discount Note Trustee.

                  (c) Each of the Orion Entities has been duly incorporated,  is
         validly  existing as a corporation  in good standing  under the laws of
         the  jurisdiction  of its  incorporation,  has the corporate  power and
         authority  to own its property and to conduct its business as described
         in the Prospectus and is duly qualified to transact  business and is in
         good standing in each jurisdiction in which the conduct of its business
         or its ownership or leasing of property  requires  such  qualification,
         except to the extent that the failure to be so  qualified or be in good
         standing  would not have a material  adverse effect on either Orion and
         its subsidiaries or Newco and its subsidiaries, in each case taken as a
         whole.

                  (d) Each of the  subsidiaries  of the Orion  Entities has been
         duly incorporated,  or in the case of a partnership, duly organized, is
         validly  existing as a corporation or partnership,  as the case may be,
         in  good  standing   under  the  laws  of  the   jurisdiction   of  its
         organization, has the corporate power and authority to own its property
         and to conduct its business as described in the  Prospectus and is duly
         qualified  to  transact  business  and  is in  good  standing  in  each
         jurisdiction  in which the conduct of its business or its  ownership or
         leasing of property requires such  qualification,  except to the extent
         that the failure to be so  qualified or be in good  standing  would not
         have a material  adverse effect on either Orion and its subsidiaries or
         Newco and its  subsidiaries,  in each case taken as a whole; all of the
         issued shares of capital stock of each subsidiary of the Orion Entities
         have been duly and validly  authorized  and issued,  are fully paid and
         non-assessable  and are  owned  directly  by either  Orion,  Newco or a
         subsidiary   of  Orion  or  Newco,   free  and  clear  of  all   liens,
         encumbrances, equities or claims. Each of the Significant Subsidiaries,
         as defined in  Regulation  S-X under the  Securities  Act, of the Orion
         Entities is identified on Schedule II hereto.

                  (e) This  Agreement  has been duly  authorized,  executed  and
         delivered by each of the Orion Entities.

                  (f) Each of the Senior Note Indenture and the Senior  Discount
         Note  Indenture has been duly qualified  under the Trust  Indenture Act
         and has been duly authorized by Newco and each of the  Guarantors,  and
         when executed and delivered by Newco and each of the  Guarantors,  will
         be a valid and binding  agreement of Newco and each of the  Guarantors,
         enforceable   in   accordance   with  its  terms   except  as  (i)  the
         enforceability  thereof  may be limited by  bankruptcy,  insolvency  or
         similar laws affecting  creditors'  rights generally and (ii) rights of
         acceleration and the availability of equitable  remedies may be limited
         by equitable principles of general applicability.

                  (g) The Warrant  Agreement has been duly  authorized  and when
         executed and  delivered by Newco will be a valid and binding  agreement
         of Newco,  enforceable  in accordance  with its terms except as (i) the
         enforceability  thereof  may be  limited  by the  effect of  applicable
         bankruptcy, insolvency, reorganization,  moratorium or similar laws now
         or  hereafter  in effect  relating to or  affecting  creditors'  rights
         generally  and (ii)  the  availability  of  equitable  remedies  may be
         limited by equitable principles of general applicability.

                  (h) Each of the  Senior  Notes and the Senior  Discount  Notes
         have been duly authorized by Newco and each of the Guarantors and, when
         executed and  authenticated  in accordance with the terms of the Senior
         Note Indenture and the Senior  Discount Note  Indenture,  respectively,
         and delivered to and paid for by the  Underwriters  in accordance  with
         the terms of this  Agreement,  will be entitled to the  benefits of the
         Senior  Note  Indenture  and  the  Senior   Discount  Note   Indenture,
         respectively,  and will be valid and binding  obligations  of Newco and
         each of the  Guarantors,  enforceable  in  accordance  with their terms
         except as (i) the enforceability  thereof may be limited by bankruptcy,
         insolvency or similar laws affecting  creditors'  rights  generally and
         (ii) rights of acceleration and the availability of equitable  remedies
         may be limited by equitable principles of general applicability.

                  (i) The Warrants have been duly  authorized  and when executed
         and  countersigned  in  accordance  with the  provisions of the Warrant
         Agreement,  and  delivered  to and  paid  for by  the  Underwriters  in
         accordance  with the terms of this  Agreement,  will be entitled to the
         benefits  of the  Warrant  Agreement  and  will be  valid  and  binding
         obligations of Newco enforceable in accordance with their terms, except
         as (A) the  enforceability  thereof  may be  limited  by the  effect of
         applicable  bankruptcy,  insolvency,   reorganization,   moratorium  or
         similar  laws now or  hereafter  in  effect  relating  to or  affecting
         creditors'  rights  generally  and (B) the  availability  of  equitable
         remedies   may  be  limited   by   equitable   principles   of  general
         applicability.
                  (j) The shares of Common Stock  issuable  upon exercise of the
         Warrants (the "Warrant  Shares") have been duly authorized and reserved
         by Newco and, when issued and  delivered  upon exercise of the Warrants
         in accordance with the terms of the Warrant Agreement,  will be validly
         issued,  fully paid and  non-assessable  and will not be subject to any
         preemptive  or similar  rights or taxes,  liens,  charges and  security
         interests.

                  (k)  The  Exchange,  the  Merger,  the  issuance  and  sale of
         approximately   $50   million  of  Newco's   convertible   subordinated
         debentures (the "BA  Debentures") to British  Aerospace  Public Limited
         Company (the "British  Aerospace  Offering"),  the issuance and sale of
         approximately $10 million of Newco debentures (the "MMS Debentures") to
         Matra  Marconi  Space  (or an  affiliate)  ("the  MMS  Offering"),  the
         acquisition by Orion of the only outstanding minority interest (17%) in
         Orion Asia Pacific, a Delaware  corporation  ("Orion Asia Pacific") for
         86,000  shares  of Orion  common  stock  (the  "OAP  Minority  Interest
         Acquisition"), the repayment of the Orion 1 Credit Facility (as defined
         in the  Preliminary  Prospectus)  and the  satisfaction of the interest
         rate  hedging   obligations   with  respect  thereto  [LIST  ADDITIONAL
         TRANSACTIONS,  AS APPROPRIATE]  (collectively,  the "Transactions") and
         delivery  and  performance  of  the  Exchange  Agreement,   the  Merger
         Agreement, the Orion 2 Satellite Contract (as hereinafter defined), the
         Orion 3  Satellite  Contract  (as  hereinafter  defined)  and the other
         agreements necessary to consummate the Transactions (collectively,  the
         "Transaction  Agreements") have been duly and validly authorized by the
         Orion Entities and each of their direct and indirect  subsidiaries (and
         Orion  Atlantic) that is a party  thereto,  and to the knowledge of the
         Orion Entities (based on  representations  made therein),  by the other
         parties  thereto,  all action necessary to approve the Transactions has
         been accomplished and no consent, approval,  authorization or order of,
         or qualification  with, any governmental body or agency is required for
         the  consummation  of the  Transactions,  except  such as may have been
         obtained,   including  any  consents  or  approvals   required  by  the
         Communications Act of 1934, as amended, and the rules,  regulations and
         policies of the United States Federal  Communications  Commission  (the
         "FCC") thereunder and the Merger and the Exchange were duly approved by
         the stockholders of Orion owning not less than a majority of the shares
         of the capital  stock of Orion  entitled  to vote  thereon at a meeting
         held on January 30, 1997.

                  (l) The execution and delivery by Newco and the Guarantors (as
         applicable)  of, and the  performance  by Newco and the  Guarantors (as
         applicable) of their obligations under, this Agreement, the Senior Note
         Indenture,  the Senior Discount Note Indenture,  the Notes, the Warrant
         Agreement, the Warrants, the Transaction Agreements, the issuance, sale
         and delivery of the Notes,  the Warrants,  the BA  Debentures,  the MMS
         Debentures and the Warrant Shares upon exercise of the Warrants and the
         consummation of the  Transactions  will not contravene any provision of
         applicable law or the certificate of  incorporation or by-laws of Newco
         or any of the Guarantors or any agreement or other  instrument  binding
         upon Newco or any of the Guarantors or any of their  subsidiaries  that
         is material  to Newco and its  subsidiaries,  taken as a whole,  or any
         judgment,  order or decree of any  governmental  body,  agency or court
         having  jurisdiction  over Newco, any subsidiary of Newco or any of the
         Guarantors,  and no consent,  approval,  authorization  or order of, or
         qualification with, any governmental body or agency is required for the
         performance  by  Newco  and the  Guarantors  (as  applicable)  of their
         obligations under this Agreement, the Senior Note Indenture, the Senior
         Discount  Note  Indenture,   the  Notes,  the  Warrant  Agreement,  the
         Warrants, the Transaction  Agreements,  the issuance, sale and delivery
         of the Notes, the BA Debentures,  the MMS Debentures, the Warrants, the
         Warrant  Shares upon  exercise of the Warrants in  accordance  with the
         terms of the Warrant  Agreement or any of the  Transaction  Agreements,
         except  such as have been  obtained  or such as may be  required by the
         securities or Blue Sky laws of the various  states in  connection  with
         the offer and sale of the Units, Notes,  Warrants,  BA Debentures,  MMS
         Debentures or Warrant Shares.

                  (m)  The   execution   and  delivery  by  Orion  of,  and  the
         performance by Orion of its obligations  under,  this Agreement and the
         Transaction  Agreements and the consummation of the  Transactions  will
         not contravene  any provision of applicable  law or the  certificate of
         incorporation  or by-laws of Orion or any agreement or other instrument
         binding upon Orion or any of its subsidiaries that is material to Orion
         and its  subsidiaries,  taken as a  whole,  or any  judgment,  order or
         decree of any governmental  body,  agency or court having  jurisdiction
         over Orion or any subsidiary, and no consent,  approval,  authorization
         or order of, or qualification  with, any governmental body or agency is
         required for the  performance  by Orion of its  obligations  under this
         Agreement  or any of the  Transaction  Agreements,  except such as have
         been obtained or such as may be required by the  securities or Blue Sky
         laws of the various states in connection with the offer and sale of the
         Units,  Notes,  Warrants,  BA  Debentures,  MMS  Debentures  or Warrant
         Shares.

                  (n) There has not occurred any material adverse change, or any
         development  involving a prospective  material  adverse change,  in the
         condition,  financial or  otherwise,  or in the  earnings,  business or
         operations  of  either  Orion  and its  subsidiaries  or Newco  and its
         subsidiaries, in each case taken as a whole, from that set forth in the
         Prospectus.

                  (o) There are no legal or governmental  proceedings pending or
         threatened  to  which  either  of the  Orion  Entities  or any of their
         subsidiaries  is a party or to which  any of the  properties  of either
         Orion Entity or any of its subsidiaries is subject that are required to
         be described in the  Registration  Statement or the  Prospectus and are
         not so  described  or any  statutes,  regulations,  contracts  or other
         documents  that  are  required  to be  described  in  the  Registration
         Statement  or  the  Prospectus  or to  be  filed  as  exhibits  to  the
         Registration Statement that are not described or filed as required.

                  (p) Each of the Orion  Entities and its  subsidiaries  has all
         necessary consents, authorizations, approvals, orders, certificates and
         permits of and from,  and has made all  declarations  and filings with,
         all federal,  state,  local and other  governmental,  administrative or
         regulatory  authorities,  all  self-regulatory  organizations  and  all
         courts  and  other  tribunals,  to  own,  lease,  license  and  use its
         properties  and  assets  and to  conduct  its  business  in the  manner
         described in the  Prospectus,  except to the extent that the failure to
         obtain such consents,  authorizations,  approvals, orders, certificates
         and  permits or make such  declarations  and  filings  would not have a
         material  adverse effect on either Orion and its  subsidiaries or Newco
         and its subsidiaries, in each case taken as a whole.

                  (q)  Each   preliminary   prospectus  filed  as  part  of  the
         Registration  Statement as originally filed or as part of any amendment
         thereto, or filed pursuant to Rule 424 or Rule 462 under the Securities
         Act,  complied  when  so  filed  in  all  material  respects  with  the
         Securities  Act  and  the  rules  and  regulations  of  the  Commission
         thereunder.

                  (r) Neither Newco nor Orion is and, after the giving effect to
         the offering and sale of the Units and the  application of the proceeds
         thereof as described in the Prospectus, neither Newco nor Orion will be
         an  "investment  company"  as such term is  defined  in the  Investment
         Company Act of 1940, as amended.

                  (s) Each of the Orion Entities and its subsidiaries are (i) in
         compliance  with any and all  applicable  foreign,  federal,  state and
         local laws and  regulations  relating to the protection of human health
         and safety, the environment or hazardous or toxic substances or wastes,
         pollutants or contaminants  ("Environmental  Laws"), (ii) have received
         all  permits,  licenses  or  other  approvals  required  of them  under
         applicable  Environmental  Laws to conduct their respective  businesses
         and (iii) are in compliance  with all terms and  conditions of any such
         permit,  license or  approval,  except  where such  noncompliance  with
         Environmental  Laws,  failure to receive required permits,  licenses or
         other  approvals or failure to comply with the terms and  conditions of
         such  permits,  licenses  or  approvals  would  not,  singly  or in the
         aggregate,  have a material adverse effect on such Orion Entity and its
         subsidiaries, taken as a whole.

                  (t)  There  are  no  costs  or  liabilities   associated  with
         Environmental  Laws  (including,  without  limitation,  any  capital or
         operating  expenditures required for clean up, closure of properties or
         compliance with Environmental Laws or any permit,  license or approval,
         any related  constraints  on  operating  activities  and any  potential
         liabilities to third parties) which would,  singly or in the aggregate,
         have a material  adverse effect on either Orion and its subsidiaries or
         Newco and its subsidiaries, in each case taken as a whole.

                  (u) The Orion  Entities have  complied with all  provisions of
         Section 517.075, Florida Statutes (Chapter 92-198, Laws of Florida).

                  (v) Each of the  parties  to the  Transaction  Agreements  has
         waived the conditions to the performance of its obligations  under such
         Transaction  Agreements  (other than the  conditions  that the Notes be
         issued and that the Orion 1 Credit  Facility be repaid) and attached as
         Exhibits [___ through ___] are such waivers.
                  (w) The Escrow  Agreement  has been  amended  to  [remove  any
         discretion  of the  limited  partners  of  Orion  Atlantic  to stop the
         release of payment from the escrow account].

                  (x) Orion Asia Pacific will be a wholly  owned  subsidiary  of
         Newco immediately after consummation of the Transactions.

                  (y) Orion has entered into,  and  delivered to you,  satellite
         procurement  contracts with Matra Marconi Space for Orion 2 (the "Orion
         2   Satellite   Contract")   and   Hughes   Space  and   Communications
         International for Orion 3 (the "Orion 3 Satellite Contract").

                                       II.

                  Newco  hereby  agrees  to  sell to the  Underwriters,  and the
Underwriters,  upon  the  basis of the  representations  and  warranties  herein
contained,  but subject to the conditions  hereinafter stated, agree,  severally
and not jointly,  to purchase  from Newco the  respective  number of Senior Note
Units and Senior  Discount  Note Units set forth in  Schedule I hereto  opposite
their names at $[____] per Senior Note Unit and $[____] per Senior Discount Note
Unit -- the "Senior Note Unit purchase price" and the "Senior Discount Note Unit
purchase price,"  respectively -- plus (i) accrued interest on the Senior Notes,
if any, and (ii) accrued  amortization  of original issue discount on the Senior
Discount Notes,  if any, in each case from [_____],  1997 to the date of payment
and delivery.


                                      III.

                  Each  of  the  Orion  Entities  is  advised  by you  that  the
Underwriters  propose to make a public offering of their respective  portions of
the Units as soon after the Original  Registration  Statement and this Agreement
have  become  effective  as in your  judgment  is  advisable.  Each of the Orion
Entities  is  further  advised  by you that the Units are to be  offered  to the
public initially at $[____] per Senior Note Unit and $[____] per Senior Discount
Note Unit -- the  "Senior  Note Unit  public  offering  price"  and the  "Senior
Discount Note Unit offering price," respectively -- plus (i) accrued interest on
the Senior  Notes,  if any,  and (ii)  accrued  amortization  of original  issue
discount on the Senior Discount  Notes, if any, and to certain dealers  selected
by you at a price that  represents  a  concession  not in excess of $[____]  per
Unit,  and that any  Underwriter  may allow,  and such  dealers may  reallow,  a
concession,  not in excess of $[____] per Unit, to any Underwriter or to certain
other dealers.


                                       IV.

                  Payment  for the Units shall be made  against  delivery of the
Units as described in the  paragraph  below at a closing (the  "Closing")  to be
held at the office of Shearman & Sterling,  599 Lexington Avenue,  New York, New
York, 10022, at 10:00 A.M., local time, on [___________], 1997, or at such other
time on the same or such other date, not later than [______],  1997, as shall be
designated in writing by you (the "Closing  Date").  Payment for the Units shall
be made to the account or accounts  specified  by Newco in writing  delivered to
you.

                  At the  closing,  the Units shall be  delivered to you for the
respective  accounts of the  Underwriters of the Units  registered in such names
and in such  denominations  as you shall  request in writing  not later than two
full business day prior to the date of delivery, with any transfer taxes payable
in connection with the transfer of the Units to the Underwriters duly paid.


                                       V.

                  The   obligations  of  the  Orion  Entities  and  the  several
obligations of the Underwriters  hereunder are subject to the condition that the
Registration  Statement  shall  have  become  effective  not later than the date
hereof.

                  The several  obligations  of the  Underwriters  hereunder  are
subject to the following further conditions:

                  (a) Subsequent to the execution and delivery of this Agreement
         and prior to the Closing Date,

                           (i) there shall not have  occurred  any  downgrading,
                  nor  shall  any  notice  have been  given of any  intended  or
                  potential  downgrading or of any review for a possible  change
                  that does not indicate the  direction of the possible  change,
                  in the  rating  accorded  any  of  Orion's  securities  by any
                  "nationally  recognized  statistical rating organization",  as
                  such term is defined for purposes of Rule 436(g)(2)  under the
                  Securities Act; and

                           (ii) there shall not have occurred any change, or any
                  development  involving a prospective change, in the condition,
                  financial  or  otherwise,  or in  the  earnings,  business  or
                  operations,  of either Orion and its subsidiaries or Newco and
                  its subsidiaries, in each case taken as a whole, from that set
                  forth in the Registration  Statement,  that, in your judgment,
                  is material  and adverse and that makes it, in your  judgment,
                  impracticable  to  market  the  Units on the  terms and in the
                  manner contemplated in the Prospectus.

                  (b) The Underwriters shall have received on the Closing Date a
         certificate,  dated the Closing Date and signed by an executive officer
         of Orion,  on behalf of Orion, to the effect set forth in clause (a)(i)
         above and to the effect that the  representations and warranties of the
         Orion  Entities  contained in this Agreement are true and correct as of
         the Closing Date and that the Orion  Entities have complied with all of
         the agreements  and satisfied all of the  conditions  contained in this
         Agreement  on their part to be  performed or satisfied on or before the
         Closing Date.

                           The officer signing and delivering  such  certificate
         may rely upon the best of his knowledge as to proceedings threatened.

                  (c) The Underwriters shall have received on the Closing Date a
         certificate,  dated the Closing Date and signed by an executive officer
         of  Newco,   on  behalf  of  such  entity,   to  the  effect  that  the
         representations  and warranties of the Orion Entities contained in this
         Agreement  are true and  correct  in all  material  respects  as of the
         Closing Date and that the Orion  Entities have complied with all of the
         agreements  and  satisfied  all of the  conditions  contained  in  this
         Agreement  on their part to be  performed or satisfied on or before the
         Closing Date.

                           The officer signing and delivering  such  certificate
         may rely upon the best of his knowledge as to proceedings threatened.

                  (d)  No  stop  order  suspending  the   effectiveness  of  the
         Registration  Statement  shall be in effect and no proceedings for such
         purpose  shall be  pending  before  or, to the  knowledge  of the Orion
         Entities or the Underwriters, threatened by the Commission.

                  (e) You shall have  received on the Closing Date an opinion of
         Hogan &  Hartson  L.L.P.,  counsel  for the Orion  Entities,  dated the
         Closing Date, in the form attached hereto as Exhibit A.

                  The opinion of Hogan & Hartson L.L.P. shall be rendered to you
         at the request of the Orion Entities and shall so state therein.

                  (f) You shall have  received on the Closing Date an opinion of
         Shaw,  Pittman,  Potts & Trowbridge,  special FCC counsel for the Orion
         Entities,  dated  the  Closing  Date,  in the form  attached  hereto as
         Exhibit B.

                  (g) You shall have  received on the Closing Date an opinion of
         [___________], special Delaware counsel for the Orion Entity, dated the
         Closing Date, in the form attached hereto as Exhibit C.

                  (h) You shall have  received on the Closing Date an opinion of
         Shearman & Sterling,  counsel for the  Underwriters,  dated the Closing
         Date with respect to the Registration  Statement and the Prospectus and
         such other  related  matters as you may  reasonably  request,  and such
         counsel shall have received such documents and  information as they may
         reasonably request to enable them to pass upon such matters.

                  (i) You shall have  received,  on each of the date  hereof and
         the Closing  Date, a letter dated the date hereof or the Closing  Date,
         as the case may be, in form and  substance  satisfactory  to you,  from
         Ernst &  Young,  L.L.P.,  independent  public  accountants  for  Orion,
         containing  statements and information of the type ordinarily  included
         in accountants'  "comfort  letters" to underwriters with respect to the
         financial statements and certain financial information contained in the
         Registration Statement and the Prospectus.

                  (j) The Orion Entities shall have complied with the provisions
         of Section VI(a) hereof with respect to the furnishing of  Prospectuses
         on the business day next succeeding the date of this Agreement, in such
         quantities as you shall have reasonably requested.

                  (k)  The  Exchange,  the  Merger,  the BA  Offering,  the  MMS
         Offering,  the OAP Minority Interest Acquisition,  the repayment of the
         Orion 1 Credit  Facility and  satisfaction of the interest rate hedging
         obligations with respect thereto and [LIST ADDITIONAL TRANSACTIONS,  AS
         APPROPRIATE] shall have occurred,  or shall occur concurrently with the
         Closing, as provided in the Proxy  Statement/Prospectus,  dated January
         ___, 1997, of Orion.

                  (l) The Certificate of Merger shall have been, or concurrently
         with the Closing  shall be,  filed with the  Secretary  of State of the
         State of Delaware.

                  (m)  You  shall  have  received   such  other   documents  and
         certificates as are reasonably requested by you or your counsel.


                                       VI.

                  In further consideration of the agreements of the Underwriters
herein contained, each of the Orion Entities covenants as follows:

                  (a) To furnish to you, without charge,  three signed copies of
         the Registration Statement (including exhibits thereto) and, during the
         period  mentioned  in  paragraph  (c)  below,  as  many  copies  of the
         Prospectus  and  any  supplements  and  amendments  thereto  or to  the
         Registration  Statement as you may reasonably  request.  In the case of
         the Prospectus,  to furnish to you copies of the Prospectus in New York
         City,  prior to 3:00 p.m., on the business day next succeeding the date
         of this Agreement, in such quantities as you reasonably request.

                  (b)  Before  amending  or   supplementing   the   Registration
         Statement  or the  Prospectus,  to  furnish  to you a copy of each such
         proposed  amendment  or  supplement  and not to file any such  proposed
         amendment or supplement to which you reasonably object.

                  (c) If,  during such period after the first date of the public
         offering of the Units as in the opinion of your counsel the  Prospectus
         is  required  by law to be  delivered  in  connection  with sales by an
         Underwriter  or dealer,  any event shall occur or condition  exist as a
         result of which it is necessary to amend or supplement  the  Prospectus
         in  order  to  make  the  statements  therein,  in  the  light  of  the
         circumstances  when the  Prospectus  is delivered  to a purchaser,  not
         misleading,  or if, in the opinion of your counsel,  it is necessary to
         amend or supplement  the  Prospectus  to comply with law,  forthwith to
         prepare,  file with the Commission and furnish,  at its own expense, to
         the Underwriters and to the dealers (whose names and addresses you will
         furnish to Newco) to which Units may have been sold by you on behalf of
         the  Underwriters  and  to  any  other  dealers  upon  request,  either
         amendments or  supplements  to the Prospectus so that the statements in
         the Prospectus as so amended or supplemented  will not, in the light of
         the circumstances  when the Prospectus is delivered to a purchaser,  be
         misleading or so that the Prospectus, as amended or supplemented,  will
         comply with law.

                  (d) To endeavor to qualify the Units,  Notes and  Warrants for
         offer  and  sale  under  the  securities  or  Blue  Sky  laws  of  such
         jurisdictions as you shall  reasonably  request and to pay all expenses
         (including fees and  disbursements  of counsel) in connection with such
         qualification  and in  connection  with  (i) the  determination  of the
         eligibility of the Units,  Notes and Warrants for investment  under the
         laws of such  jurisdiction  as you may designate and (ii) any review of
         the Offering by the National Association of Securities Dealers, Inc.

                  (e) If the Orion  Entities  elect to rely on Rule 462(b) under
         the  Securities  Act,  the  Orion  Entities  shall  file a Rule  462(b)
         Registration  Statement  with the  Commission in  compliance  with Rule
         462(b) under the  Securities Act no later than the earlier of (i) 10:00
         p.m.  Eastern  time on the date hereof and (ii) the time  confirmations
         are sent or given,  as specified by Rule 462(b)(2) under the Securities
         Act,  and shall pay the  applicable  fees in  accordance  with Rule 111
         under the Securities Act.

                  (f) To make generally  available to Newco's  security  holders
         and to you, as soon as practicable but not later than 60 days after the
         end of the  twelve-month  period beginning at the end of Newco's fiscal
         quarter  during which the effective  date of the Original  Registration
         Statement  occurs,  an  earnings   statement  of  Newco  covering  such
         twelve-month  period that  satisfies the provisions of Section 11(a) of
         the  Securities  Act and the rules and  regulations  of the  Commission
         thereunder.

                  (g)  During  the  period  beginning  on the  date  hereof  and
         continuing  to and  including  the Closing  Date,  not to offer,  sell,
         contract to sell or otherwise  dispose of any debt  securities of Newco
         or warrants to purchase  securities of Newco  substantially  similar to
         the Units,  Notes,  Warrants or Common Stock (other than (i) the Units,
         Notes and Warrants, (ii) securities of Newco to be issued in connection
         with  the   Exchange   and  the  Merger  as   described  in  the  Proxy
         Statement/Prospectus,  (iii) the issuance and sale of the BA Debentures
         pursuant to the British  Aerospace  Offering  and (iv) the issuance and
         sale of the MMS Debentures  pursuant to the MMS Offering,  without your
         prior written consent.

                  (h) To use its best efforts to maintain the  effectiveness  of
         the Registration  Statement covering the issuance of the Warrant Shares
         until the earlier of (i) such time as all Warrants have been  exercised
         and (ii) [_____], 2007.

                  (i) To use  its  best  efforts  to  have  the  Warrant  Shares
         included  for trading on the Nasdaq  National  Market prior to the time
         the Warrants  first become  exercisable  and to use its best efforts to
         have the Warrant  Shares  included for trading on any other exchange or
         quotation system where the Common Stock is included for trading.

                  (j) To use the net proceeds received by Newco from the sale of
         (i) Units  hereunder,  (ii) the BA  Debentures  pursuant to the British
         Aerospace  Offering  and (iii) the MMS  Debentures  pursuant to the MMS
         Offering,  in the manner  specified in the Prospectus under the caption
         "Use of Proceeds."

                  (k) Whether or not the  transactions  contemplated  hereby are
         consummated or this  Agreement is terminated,  the Orion Entities agree
         to pay,  or  reimburse  if paid by or on behalf  of you,  all costs and
         expenses  incident  to  the  public  offering  of  the  Units  and  the
         performance  of  the  obligations  of the  Orion  Entities  under  this
         Agreement including those relating to: (i) the fees,  disbursements and
         expenses of the Orion  Entities'  counsel and accountants in connection
         with the issuance of the Units, the preparation,  printing,  filing and
         distribution  of  the  Registration   Statement   including   financial
         statements  and  all  exhibits,   each  preliminary   prospectus,   the
         Prospectus,   all  amendments  and  supplements  to  the   Registration
         Statement,   and  the   Prospectus,   and  the  printing,   filing  and
         distribution  of this  Agreement  (including  all  document  production
         charges and expenses of counsel for the Underwriters in connection with
         the preparation of this  Agreement);  (ii) the preparation and delivery
         of any  certificates  for the  Units  to the  Underwriters;  (iii)  all
         expenses in connection with the  registration or  qualification  of the
         Units, Notes,  Warrants and Warrant Shares for offer and sale under the
         securities or Blue Sky laws of such jurisdictions as you shall request,
         including  the  reasonable  fees and  disbursements  of counsel for the
         Underwriters in connection with such registration and qualification and
         the preparation, printing, distribution and shipment of preliminary and
         supplementary Blue Sky memoranda;  (iv) the furnishing (including costs
         of shipping  and mailing) to you and to the  Underwriters  of copies of
         each  preliminary  prospectus,  the  Prospectus  and all  amendments or
         supplements to the Prospectus, and of the several documents required by
         this paragraph to be so furnished,  as may be reasonably  requested for
         use in  connection  with  the  offering  and  sale of the  Units by the
         Underwriters  or by dealers  to whom Units may be sold;  (v) the filing
         fees and expenses  (including the reasonable fees and  disbursements of
         counsel to the  Underwriters),  if any,  incurred  with  respect to any
         filing with the National  Association  of Securities  Dealers,  Inc. in
         connection  with its review of the terms of the public  offering;  (vi)
         any expenses  incurred by the Orion Entities in connection with a "road
         show"  presentation  to  potential  investors;  and (vii) all  transfer
         taxes,  if any,  with  respect to the sale and delivery of the Units by
         the Orion Entities to the Underwriters.

                  (l) To use the net proceeds of the British Aerospace  Offering
         and the MMS Offering to make  payments to the  manufacturers  under the
         Orion 2 Satellite Contract and the Orion 3 Satellite Contract.


                                      VII.

                  Each of the Orion Entities agrees,  jointly and severally,  to
indemnify  and hold  harmless  each  Underwriter  and each  person,  if any, who
controls  such  Underwriter  within  the  meaning  of either  Section  15 of the
Securities Act or Section 20 of the Securities  Exchange Act of 1934, as amended
(the "Exchange Act"), from and against any and all losses,  claims,  damages and
liabilities  (including,   without  limitation,  any  legal  or  other  expenses
reasonably  incurred  by any  Underwriter  or any  such  controlling  person  in
connection with defending or  investigating  any such action or claim) caused by
any untrue statement or alleged untrue statement of a material fact contained in
the Registration  Statement or any amendment thereof, any preliminary prospectus
or the Prospectus (as amended or  supplemented if Newco shall have furnished any
amendments  or  supplements  thereto),  or caused  by any  omission  or  alleged
omission  to state  therein a material  fact  required  to be stated  therein or
necessary to make the statements therein not misleading,  except insofar as such
losses,  claims,  damages or liabilities are caused by any such untrue statement
or omission or alleged  untrue  statement  or  omission  based upon  information
relating to any Underwriter furnished to either of the Orion Entities in writing
by such Underwriter through you expressly for use therein.

                  Each  Underwriter  agrees,   severally  and  not  jointly,  to
indemnify  and  hold  harmless  each of the  Orion  Entities,  their  respective
directors,  their respective  officers who sign the  Registration  Statement and
each  person,  if any, who  controls  the Orion  Entities  within the meaning of
either Section 15 of the Securities Act or Section 20 of the Exchange Act to the
same  extent  as the  foregoing  indemnity  from  the  Orion  Entities  to  such
Underwriter, but only with reference to information relating to such Underwriter
furnished  to the Orion  Entities  in writing by such  Underwriter  through  you
expressly for use in the Registration Statement, any preliminary prospectus, the
Prospectus or any amendments or supplements thereto.

                  In   case   any   proceeding   (including   any   governmental
investigation)  shall be  instituted  involving  any  person in respect of which
indemnity may be sought pursuant to either of the two preceding paragraphs, such
person (the  "indemnified  party") shall promptly notify the person against whom
such  indemnity  may be sought  (the  "indemnifying  party") in writing  and the
indemnifying  party, upon request of the indemnified party, shall retain counsel
reasonably  satisfactory to the  indemnified  party to represent the indemnified
party and any others the indemnifying party may designate in such proceeding and
shall pay the fees and disbursements of such counsel related to such proceeding.
In any such proceeding, any indemnified party shall have the right to retain its
own counsel,  but the fees and expenses of such counsel  shall be at the expense
of such indemnified party unless (i) the indemnifying  party and the indemnified
party shall have  mutually  agreed to the  retention of such counsel or (ii) the
named parties to any such proceeding  (including any impleaded  parties) include
both the indemnifying party and the indemnified party and representation of both
parties by the same counsel  would be  inappropriate  due to actual or potential
differing  interests between them. It is understood that the indemnifying  party
shall  not,  in  respect  of the  legal  expenses  of any  indemnified  party in
connection with any proceeding or related  proceedings in the same jurisdiction,
be liable for the fees and expenses of more than one separate  firm (in addition
to any local  counsel) for all such  indemnified  parties and that all such fees
and  expenses  shall be  reimbursed  as they are  incurred.  Such firm  shall be
designated  in  writing  by Morgan  Stanley & Co.  Incorporated,  in the case of
parties indemnified pursuant to the second preceding paragraph, and by the Orion
Entities,  in the case of parties  indemnified  pursuant to the first  preceding
paragraph.  The indemnifying party shall not be liable for any settlement of any
proceeding  effected  without  its  written  consent,  but if settled  with such
consent or if there be a final  judgment  for the  plaintiff,  the  indemnifying
party agrees to  indemnify  the  indemnified  party from and against any loss or
liability  by  reason  of  such  settlement  or  judgment.  Notwithstanding  the
foregoing sentence,  if at any time an indemnified party shall have requested an
indemnifying  party to reimburse the indemnified  party for fees and expenses of
counsel as contemplated by the second and third sentences of this paragraph, the
indemnifying  party  agrees  that it shall be liable for any  settlement  of any
proceeding  effected  without  its  written  consent if (i) such  settlement  is
entered into more than 30 days after receipt by such  indemnifying  party of the
aforesaid request and (ii) such indemnifying party shall not have reimbursed the
indemnified  party in  accordance  with such  request  prior to the date of such
settlement.  No indemnifying  party shall,  without the prior written consent of
the  indemnified  party,  effect any  settlement  of any  pending or  threatened
proceeding  in  respect of which any  indemnified  party is or could have been a
party and indemnity could have been sought hereunder by such indemnified  party,
unless such settlement  includes an  unconditional  release of such  indemnified
party  from  all  liability  on  claims  that  are the  subject  matter  of such
proceeding.

                  If the  indemnification  provided  for in the  first or second
paragraph  of  this  Article  VII is  unavailable  to an  indemnified  party  or
insufficient in respect of any losses,  claims,  damages or liabilities referred
to  therein,  then each  indemnifying  party  under such  paragraph,  in lieu of
indemnifying such indemnified  party thereunder,  shall contribute to the amount
paid or payable by such  indemnified  party as a result of such losses,  claims,
damages or liabilities  (i) in such  proportion as is appropriate to reflect the
relative  benefits  received  by the  Orion  Entities  on the one  hand  and the
Underwriters  on the other  hand from the  offering  of the Units or (ii) if the
allocation  provided by clause (i) above is not permitted by applicable  law, in
such  proportion  as is  appropriate  to reflect not only the relative  benefits
referred  to in  clause  (i)  above  but also the  relative  fault of the  Orion
Entities on the one hand and of the Underwriters on the other hand in connection
with the statements or omissions that resulted in such losses,  claims,  damages
or  liabilities,  as well as any other relevant  equitable  considerations.  The
relative  benefits  received  by the  Orion  Entities  on the one  hand  and the
Underwriters  on the other hand in  connection  with the  offering  of the Units
shall be deemed to be in the same  respective  proportions  as the net  proceeds
from the offering of the Units (before deducting expenses) received by the Orion
Entities and the total  underwriting  discounts and commissions  received by the
Underwriters,  in each  case as set  forth  in the  table  on the  cover  of the
Prospectus,  bear to the  aggregate  public  offering  price of the  Units.  The
relative fault of the Orion Entities on the one hand and of the  Underwriters on
the other hand shall be determined by reference to, among other things,  whether
the untrue or alleged  untrue  statement  of a material  fact or the omission or
alleged omission to state a material fact relates to information supplied by the
Orion  Entities  or by  the  Underwriters  and  the  parties'  relative  intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
statement or omission.  The Underwriters'  respective  obligations to contribute
pursuant  to this  Article  VII are  several  in  proportion  to the  respective
principal amounts of Units they have purchased hereunder, and not joint.

                  The Orion  Entities and the  Underwriters  agree that it would
not be just or  equitable  if  contribution  pursuant  to this  Article VII were
determined by pro rata allocation (even if the Underwriters  were treated as one
entity for such purpose) or by any other method of allocation that does not take
account of the equitable considerations referred to in the immediately preceding
paragraph. The amount paid or payable by an indemnified party as a result of the
losses, claims, damages and liabilities referred to in the immediately preceding
paragraph  shall be deemed to  include,  subject  to the  limitations  set forth
above, any legal or other expenses reasonably incurred by such indemnified party
in  connection  with  investigating  or  defending  any such  action  or  claim.
Notwithstanding  the  provisions  of this Article VII, no  Underwriter  shall be
required  to  contribute  any  amount in excess of the amount by which the total
price at which the Units  underwritten  by it and distributed to the public were
offered to the public  exceeds the amount of any damages  that such  Underwriter
has otherwise  been  required to pay by reason of such untrue or alleged  untrue
statement  or  omission  or alleged  omission.  No person  guilty of  fraudulent
misrepresentation  (within the meaning of Section 11(f) of the  securities  Act)
shall be  entitled  to  contribution  from any person who was not guilty of such
fraudulent misrepresentation.  The remedies provided for in this Article VII are
not exclusive and shall not limit any rights or remedies  which may otherwise be
available to any indemnified party at law or in equity.

                  The indemnity and  contribution  provisions  contained in this
Article  VII  and the  representations  and  warranties  of the  Orion  Entities
contained in this Agreement shall remain  operative and in full force and effect
regardless of (i) any termination of this Agreement, (ii) any investigation made
by or on behalf of any Underwriter or any person  controlling any Underwriter or
by or on behalf of either Orion Entity,  its officers or directors or any person
controlling  either Orion Entity and (iii)  acceptance of and payment for any of
the Units.


                                      VIII.

                  This Agreement shall be subject to termination by notice given
by you to Newco,  if (a) after the execution and delivery of this  Agreement and
prior to the Closing  Date (i) trading  generally  shall have been  suspended or
materially  limited  on or by,  as the  case may be,  any of the New York  Stock
Exchange,  the American Stock Exchange,  the National  Association of Securities
Dealers,  Inc., the Chicago Board of Options  Exchange,  the Chicago  Mercantile
Exchange or the Chicago Board of Trade,  (ii) trading of any securities of Orion
or Newco shall have been  suspended on any  exchange or in any  over-the-counter
market,  (iii) a general moratorium on commercial banking activities in New York
shall have been declared by either Federal or New York State authorities or (iv)
there shall have  occurred  any outbreak or  escalation  of  hostilities  or any
change in financial markets or any calamity or crisis that, in your judgment, is
material  and  adverse  and (b) in the case of any of the  events  specified  in
clauses (a)(i)  through (iv),  such event singly or together with any other such
event makes it, in your judgment, impracticable to market the Units on the terms
and in the manner contemplated in the Prospectus.


                                       IX.

                  This  Agreement  shall become  effective upon the later of (x)
execution  and  delivery  hereof  by the  parties  hereto  and  (y)  release  of
notification of the effectiveness of the Original Registration  Statement by the
Commission.

                  If, on the Closing  Date,  any one of the  Underwriters  shall
fail or refuse to  purchase  Units that it has agreed to purchase  hereunder  on
such date, and the number of Units which such defaulting  Underwriter agreed but
failed or refused to purchase is not more than  one-tenth of the total number of
the Units to be purchased on such date, the other Underwriter shall be obligated
to purchase  the Units which such  defaulting  Underwriter  agreed but failed or
refused to purchase on such date;  provided that in no event shall the number of
Units that any  Underwriter  has agreed to  purchase  pursuant  to Article II be
increased  pursuant to this  Article IX by an amount in excess of  one-ninth  of
such number of Units without the written consent of such Underwriter. If, on the
Closing Date,  any  Underwriter  shall fail or refuse to purchase  Units and the
aggregate number of Units with respect to which such default occurs is more than
one-tenth of the number of Units to be purchased on such date, and  arrangements
satisfactory  to you and the Orion  Entities  for the purchase of such Units are
not made within 36 hours after such  default,  this  Agreement  shall  terminate
without  liability  on the part of any  nondefaulting  Underwriter  or the Orion
Entities. In any such case either you or the Orion Entities shall have the right
to  postpone  the Closing  Date but in no event for longer  than seven days,  in
order that the required  changes,  if any, in the Registration  Statement and in
the Prospectus or in any other  documents or arrangements  may be effected.  Any
action taken under this paragraph  shall not relieve any defaulting  Underwriter
from  liability  in  respect  of any  default  of such  Underwriter  under  this
Agreement.

                  If this Agreement shall be terminated by the Underwriters,  or
any one of them,  because of any failure or refusal on the part of either of the
Orion  Entities to comply with the terms or to fulfill any of the  conditions of
this  Agreement,  or if for any  reason  either of the Orion  Entities  shall be
unable to perform its obligations under this Agreement,  the Orion Entities will
reimburse  the  Underwriters,  or such  Underwriter  as has so  terminated  this
Agreement  with respect to itself,  severally,  for all  out-of-pocket  expenses
(including the fees and disbursements of their counsel)  reasonably  incurred by
such Underwriters in connection with this Agreement or the offering contemplated
hereunder.

                  This Agreement may be signed in two or more counterparts, each
of which shall be an original, with the same effect as if the signatures thereto
and hereto were upon the same instrument.


<PAGE>






                  This  Agreement  shall be governed by the laws of the State of
New York.


                                Very truly yours,

                                ORION NETWORK SYSTEMS, INC.


                                By


                                ORION NEWCO SERVICES, INC.


                                By





Accepted, [_________], 1997

Morgan Stanley & Co.
     Incorporated
Merrill Lynch & Co.

By Morgan Stanley & Co.
     Incorporated


By_______________________


<PAGE>
<TABLE>
<CAPTION>



                                   SCHEDULE I

     Underwriter                             Number of Senior Note        Number of Senior
                                             Units to Be Purchased     Discount Note Units to
                                                                            be Purchased
<S>                                                <C>                     <C>
Morgan Stanley & Co. Incorporated

Merrill Lynch & Co.                                __________                __________

Total . . . . . . . . . . . . .                    __________                __________
                                                   ----------                ----------

</TABLE>


<PAGE>



                                   SCHEDULE II

                        List of Significant Subsidiaries


                            [TO BE PROVIDED BY ORION]


<PAGE>




                                    EXHIBIT A


                    Form of Opinion of Hogan & Hartson L.L.P.


                 (i) Each of the Orion Entities has been duly  incorporated,  is
   validly  existing  as a  corporation  in  good  standing  under  the  laws of
   Delaware,  has the  corporate  power and authority to own its property and to
   conduct its business as described in the  Prospectus and is duly qualified to
   transact  business and is in good standing in each  jurisdiction in which the
   conduct of its business or its ownership or leasing of property requires such
   qualification, except to the extent that the failure to be so qualified or be
   in good standing would not have a material adverse effect on either Orion and
   its  subsidiaries  or Newco and its  subsidiaries,  in each  case  taken as a
   whole.

                 (ii) Each of the  subsidiaries  of the Orion  Entities has been
   duly  incorporated,  or in the  case of a  partnership,  duly  organized,  is
   validly existing as a corporation or partnership, as the case may be, in good
   standing  under the laws of the  jurisdiction  of its  organization,  has the
   power and  authority  to own its  property  and to conduct  its  business  as
   described in the Prospectus and is duly qualified to transact business and is
   in good standing in each jurisdiction in which the conduct of its business or
   its ownership or leasing of property requires such  qualification,  except to
   the extent that the failure to be so qualified or be in good  standing  would
   not have a material  adverse effect on either Orion and its  subsidiaries  or
   Newco and its subsidiaries,  in each case taken as a whole; all of the issued
   shares of capital stock of each  subsidiary  of the Orion  Entities have been
   validly  authorized  and issued,  are fully paid and  non-assessable  and are
   owned directly by either Orion, Newco or a subsidiary of Orion or Newco, free
   and clear of all liens, encumbrances, equities or claims.

                 (iii)  The  authorized  capital  stock  of the  Orion  Entities
   conforms in all material respects to the description thereof set forth in the
   Prospectus under the caption "Description of Capital Stock."

                 (iv)  The  Underwriting  Agreement  has been  duly  authorized,
   executed and delivered by each of the Orion Entities.

                 (v) Each of the Senior Note  Indenture and the Senior  Discount
   Note Indenture has been duly qualified  under the Trust Indenture Act and has
   been duly authorized by Newco and each of the  Guarantors,  and when executed
   and  delivered  by Newco  and  each of the  Guarantors,  will be a valid  and
   binding  agreement  of  Newco  and  each of the  Guarantors,  enforceable  in
   accordance  with its  terms  except  as (i) the  enforceability  thereof  may
   belimited by  bankruptcy,  insolvency  or similar laws  affecting  creditors'
   rights  generally and (ii) rights of  acceleration  and the  availability  of
   equitable  remedies  may  be  limited  by  equitable  principles  of  general
   applicability.  

                 (vi) The Warrant  Agreement has been duly  authorized  and when
   executed  and  delivered  by Newco will be a valid and binding  agreement  of
   Newco,   enforceable  in  accordance   with  its  terms  except  as  (i)  the
   enforceability thereof may be limited by the effect of applicable bankruptcy,
   insolvency,  reorganization,  moratorium  or similar laws now or hereafter in
   effect  relating to or affecting  creditors'  rights  generally  and (ii) the
   availability of equitable remedies may be limited by equitable  principles of
   general applicability.

                 (vii) Each of the Senior  Notes and the Senior  Discount  Notes
   have been duly authorized and, when executed and  authenticated in accordance
   with the terms of the Senior  Note  Indenture  and the Senior  Discount  Note
   Indenture, respectively, and delivered to and paid for by the Underwriters in
   accordance with the terms of the Underwriting Agreement,  will be entitled to
   the  benefits  of the Senior  Note  Indenture  and the Senior  Discount  Note
   Indenture,  respectively, and will be valid and binding obligations of Newco,
   enforceable in accordance  with their terms except as (i) the  enforceability
   thereof may be limited by  bankruptcy,  insolvency or similar laws  affecting
   creditors'   rights  generally  and  (ii)  rights  of  acceleration  and  the
   availability of equitable remedies may be limited by equitable  principles of
   general applicability.

                 (viii) The Warrants have been duly authorized and when executed
   and countersigned in accordance with the provisions of the Warrant Agreement,
   and  delivered to and paid for by the  Underwriters  in  accordance  with the
   terms of the Underwriting Agreement,  will be entitled to the benefits of the
   Warrant  Agreement  and  will be  valid  and  binding  obligations  of  Newco
   enforceable in accordance with their terms,  except as (A) the enforceability
   thereof may be limited by the effect of  applicable  bankruptcy,  insolvency,
   reorganization,  moratorium  or  similar  laws  now or  hereafter  in  effect
   relating to or affecting creditors' rights generally and (B) the availability
   of  equitable  remedies  may be limited by  equitable  principles  of general
   applicability.

                 (ix) The Warrant Shares have been duly  authorized and reserved
   by Newco and,  when issued and  delivered  upon  exercise of the  Warrants in
   accordance with the terms of the Warrant  Agreement,  will be validly issued,
   fully paid and  non-assessable  and will not be subject to any  preemptive or
   similar rights or taxes, liens, charges and security interests.

                 (x)  The  Transactions  and  delivery  and  performance  of the
   Transaction  Agreements  have been duly and validly  authorized  by the Orion
   Entities  and each of their  direct  and  indirect  subsidiaries  (and  Orion
   Atlantic) that is a party thereto, and to the knowledge of the Orion Entities
   (based on representations  made therein),  by the other parties thereto , all
   action  necessary to approve the  Transactions  has been  accomplished and no
   consent,  approval,  authorization  or order of, or  qualification  with, any
   governmental  body  or  agency  is  required  for  the  consummation  of  the
   Transactions,  except such as may have been obtained,  including any consents
   or approvals required by the Communications Act of 1934, as amended,  and the
   rules,  regulations and policies of the United States Federal  Communications
   Commission  thereunder  and the Exchange and the Merger were duly approved by
   the  stockholders  of Orion  owning not less than a majority of the shares of
   the  capital  stock of Orion  entitled to vote  thereon at a meeting  held on
   January __, 1997.

                 (xi) The execution and delivery by Newco and the Guarantors (as
   applicable)  of,  and  the  performance  by  Newco  and  the  Guarantors  (as
   applicable) of their  obligations  under,  the  Underwriting  Agreement,  the
   Senior Note Indenture,  the Senior Discount Note  Indenture,  the Notes,  the
   Warrant Agreement,  the Warrants, the Transaction  Agreements,  the issuance,
   sale and delivery of the Notes,  the  Warrants,  the BA  Debentures,  the MMS
   Debentures  and the Warrant  Shares upon  exercise  of the  Warrants  and the
   consummation  of the  Transactions  will  not  contravene  any  provision  of
   applicable law or the certificate of incorporation or by-laws of Newco or any
   of the Guarantors or any agreement or other instrument  binding upon Newco or
   any of the Guarantors or any of their  subsidiaries that is material to Newco
   and its subsidiaries,  taken as a whole, or any judgment,  order or decree of
   any governmental  body,  agency or court having  jurisdiction over Newco, any
   subsidiary  of  Newco or any of the  Guarantors,  and no  consent,  approval,
   authorization  or order of, or qualification  with, any governmental  body or
   agency  is  required  for the  performance  by Newco and the  Guarantors  (as
   applicable) of their obligations under the Underwriting Agreement, the Senior
   Note Indenture,  the Senior Discount Note Indenture,  the Notes,  the Warrant
   Agreement,  the Warrants, the Transaction Agreements,  the issuance, sale and
   delivery of the Notes, the BA Debentures,  the MMS Debentures,  the Warrants,
   the Warrant Shares upon exercise of the Warrants in accordance with the terms
   of the Warrant Agreement or any of the Transaction Agreements, except such as
   have been  obtained or such as may be required by the  securities or Blue Sky
   laws of the  various  states  in  connection  with the  offer and sale of the
   Units, Notes, Warrants, BA Debentures, the MMS Debentures or Warrant Shares.

                 (xii)  The   execution  and  delivery  by  Orion  of,  and  the
   performance by Orion of its obligations  under, the  Underwriting  Agreement,
   the Transaction  Agreements and the consummation of the Transactions will not
   contravene   any  provision  of  applicable   law  or  the   certificate   of
   incorporation  or  by-laws  of Orion  or any  agreement  or other  instrument
   binding upon Orion or any of its  subsidiaries  that is material to Orion and
   its subsidiaries,  taken as a whole, or any judgment,  order or decree of any
   governmental  body,  agency or court  having  jurisdiction  over Orion or any
   subsidiary,  and  no  consent,  approval,   authorization  or  order  of,  or
   qualification  with,  any  governmental  body or agency is  required  for the
   performance by Orion of its obligations  under the Underwriting  Agreement or
   any of the Transaction Agreements,  except such as have been obtained or such
   as may be required by the  securities or Blue Sky laws of the various  states
   in  connection  with the offer and sale of the  Units,  Notes,  Warrants,  BA
   Debentures, MMS Debentures or the Warrant Shares.

                 (xiii) The Original Registration Statement has become effective
   and, if Newco has elected to rely upon Rule 462(b) under the Securities  Act,
   the Rule 462(b) Registration  Statement shall have become effective not later
   than the earlier of (i) 10:00 p.m.  Eastern  time on the date hereof and (ii)
   the time  confirmations  are sent or given,  as specified  by Rule  462(b)(2)
   under the Securities Act; no stop order  suspending the  effectiveness of the
   Registration  Statement is in effect, and no proceedings for such purpose are
   pending before or threatened by the Commission.

                 (xiv) (i) Each part of the  Registration  Statement,  when such
   part became  effective,  did not  contain  and each such part,  as amended or
   supplemented,  if  applicable,  will not  contain any untrue  statement  of a
   material fact or omit to state a material fact required to be stated  therein
   or  necessary  to make  the  statements  therein  not  misleading,  (ii)  the
   Registration   Statement  and  the  Prospectus  comply  and,  as  amended  or
   supplemented,  if applicable,  will comply in all material  respects with the
   Securities  Act and the  applicable  rules and  regulations of the Commission
   thereunder  and (iii) the  Prospectus  does not  contain  and,  as amended or
   supplemented,  if  applicable,  will not  contain any untrue  statement  of a
   material  fact  or omit  to  state a  material  fact  necessary  to make  the
   statements therein, in light of the circumstances under which they were made,
   not misleading,  except that the  representations and warranties set forth in
   this  paragraph  (xiv) do not apply (A) to  statements  or  omissions  in the
   Registration  Statement or the Prospectus based upon information  relating to
   any Underwriter  furnished to either of the Orion Entities in writing by such
   Underwriter expressly for use therein or (B) to that part of the Registration
   Statement that  constitutes  the Statement of Eligibility  and  Qualification
   (Form T-1) under the Trust  Indenture  Act of 1939,  as amended  (the  "Trust
   Indenture  Act"),  of each of the Senior Note Trustee and the Senior Discount
   Note Trustee.

                 (xv) The information in the Prospectus  under the captions "The
   Merger and the Exchange,"  "Certain  Transactions,"  "Description  of Units,"
   "Description of Notes,"  "Description  of Warrants,"  "Description of Capital
   Stock,"  "Description  of Other  Indebtedness  of the  Company," and "Certain
   United  States  Federal  Income Tax  Consequences,"  to the extent  that such
   information  constitutes matters of law or legal conclusions,  or purports to
   describe certain provisions of specified  documents,  has been reviewed by us
   and is correct in all material  respects.  The  statements in the  Prospectus
   under  the  captions  "Risk  Factors  - -  Approvals  Needed;  Regulation  of
   Industry,"  and  "United  States  Regulatory  Restrictions,"  insofar as such
   statements  purport to describe certain  provisions of the Communications Act
   and  rules  and  regulations  of the FCC  promulgated  thereunder,  have been
   reviewed by us and are correct in all material  respects.  The information in
   Item  14 of the  Registration  Statement,  to  the  extent  such  information
   constitutes  matters of law or legal  conclusions  or  purports  to  describe
   certain  provisions  of specified  documents,  has been reviewed by us and is
   correct in all material respects.

                 (xvi) Neither Newco nor Orion is an "investment  company" or an
   entity  "controlled" by an "investment  company" as such terms are defined in
   the Investment Company Act of 1940, as amended.

                 (xvii) The  deposit of the  pledged  securities  in the pledged
   account in favor of the trustee on behalf of the holders of the Senior  Notes
   will constitute a perfected first priority interest in the pledged securities
   and the proceeds thereof.



<PAGE>



                                    EXHIBIT B
                           Form of FCC Counsel Opinion


               (i) (A) the execution and delivery of the Underwriting  Agreement
 by the Orion Entities and the  consummation  of the  transactions  contemplated
 thereby do not violate (1) the Federal  Communications  Act of 1934, as amended
 (the  "Communications  Act"),  (2) any  rules  or  regulations  of the  Federal
 Communications  Commission  ("FCC")  applicable to the Orion Entities,  (3) any
 state  telecommunications law, rules or regulations ("State Law") applicable to
 the Orion Entities, and (4) to the best of such counsel's knowledge, any decree
 from any court, and (B) no authorization of or filing with the FCC or any state
 authority  overseeing   telecommunications  matters  ("State  Authority"),   is
 necessary for the execution and delivery of the  Underwriting  Agreement by the
 Orion Entities and the consummation of the transactions contemplated thereby in
 accordance with the terms thereof;

               (ii) the Orion Entities and certain of their subsidiaries  (named
 on Schedule I hereto) are nondominant carriers authorized by the FCC to provide
 interstate  interexchange  telecommunications  services. The Orion Entities and
 certain of their  subsidiaries  (named on Schedule II hereto) have been granted
 Section   214   authority   by  the  FCC  to  provide   international   message
 telecommunications  services through the resale of international switched voice
 and private line services and each of the Orion Entities and such  subsidiaries
 has on file with the FCC tariffs  applicable  to its  domestic  interstate  and
 international  services.  No further  FCC  authority  is  required by the Orion
 Entities or any of such  subsidiaries  to conduct its  business as described in
 the Prospectus;

               (iii) the Orion Entities and certain of their subsidiaries (named
 on Schedule III hereto) are certified  and/or  registered to resell  intrastate
 interexchange  telecommunications  services  in,  and  are not  required  to be
 certified to resell intrastate  interexchange  telecommunications  services in,
 the respective states listed on Schedule IV hereto.  Each of the Orion Entities
 and such  subsidiaries  has a tariff on file in each of the states.  No further
 authority is required from any of the State  Authorities  by the Orion Entities
 to conduct their business as described in the Prospectus,

               (iv) (A) each of the Orion Entities and its  subsidiaries (1) has
 made all reports and  filings,  and paid all fees,  required by the FCC and the
 State Authorities;  and (2) has all certificates,  orders,  permits,  licenses,
 authorizations,  consents and  approvals of and from,  and has made all filings
 and  registrations,  with the FCC and the State  Authorities  necessary to own,
 lease, license and use its properties and assets and to conduct its business in
 the manner  described in the Prospectus;  and (B) neither of the Orion Entities
 nor any of their  subsidiaries has received any notice of proceedings  relating
 to the revocation or modification of any such  certificates,  orders,  permits,
 licenses,  authorizations,  consents  or  approvals,  or the  qualification  or
 rejection of any such filing or registration, the effect of which, singly or in
 the  aggregate,  would  have  a  material  adverse  effect  on  the  prospects,
 condition,  financial or otherwise, or in the earnings,  business or operations
 of either Orion and its  subsidiaries  or Newco and its  subsidiaries,  in each
 case taken as a whole;

               (v) neither of the Orion Entities nor any of its  subsidiaries is
 in   violation   of,  or  in  default   under  the   Communications   Act,  the
 telecommunications  rules or regulations of the FCC or State Law, the effect of
 which, singly or in the aggregate,  would have a material adverse effect on the
 prospects,  condition,  financial or otherwise, or in the earnings, business or
 operations of either Orion and its subsidiaries or Newco and its  subsidiaries,
 in each case taken as a whole;

               (vi) to the best of such  counsel's  knowledge  after due inquiry
 (A) no  decree  or  order of the FCC or any  State  Authority  has been  issued
 against  either of the Orion  Entities  or any of its  subsidiaries  and (B) no
 litigation,   proceeding,  inquiry  or  investigation  has  been  commenced  or
 threatened,  and no notice of violation or order to show cause has been issued,
 against  either of the Orion Entities or any of its  subsidiaries  before or by
 the FCC or any State Authority.  To the best of such counsel's  knowledge after
 due  inquiry,  there are no  rulemakings  or other  administrative  proceedings
 pending  before  the  FCC  or any  State  Authority  which  (A)  are  generally
 applicable to telecommunications  services or the resale thereof and (B) which,
 if decided  adversely to the Orion Entities'  interests,  would have a material
 adverse  effect  on  either  Orion  and  its  subsidiaries  or  Newco  and  its
 subsidiaries, in each case taken as a whole; and

               (vii) the statements in the  Prospectus  under the captions "Risk
 Factors --  Approvals  Needed;  Regulation  of  Industry,"  and "United  States
 Regulatory  Restrictions,"  insofar as such statements  constitute a summary of
 the legal matters,  documents or proceedings  referred to therein, are accurate
 in all material respects and fairly summarize all matters referred to therein.



<PAGE>







                                    EXHIBIT C

                        Form of Delaware Counsel Opinion

                      (i)  Upon the  filing  of the  Certificate  of  Merger  in
    accordance with the Merger Agreement and the General  Corporation Law of the
    State of Delaware,  the Merger will become effective,  Orion will become the
    surviving  corporation  of the Merger and each share of Orion  preferred and
    common stock  outstanding  immediately prior to the Merger will be converted
    into the right to receive substantially identical preferred and common stock
    of Newco.

- --------
*        Because  Newco  believed  that it  would be more  informative  and less
         confusing  for  potential  investors  and  existing  stockholders,  the
         Original  Registration  Statement and the prospectus  included  therein
         refer to the registrant as Orion Network Systems, Inc.


        
   


                    RESTATED CERTIFICATE OF INCORPORATION OF
                           ORION NEWCO SERVICES, INC.


         Orion Newco Services,  Inc., a corporation organized and existing under
the General Corporation Law of the State of Delaware (the  "Corporation"),  does
hereby certify that:

         1. The present name of the  Corporation is Orion Newco  Services,  Inc.
The  Corporation  was  originally  incorporated  under  the same  name,  and its
original  certificate of incorporation  was filed with the Secretary of State of
the State of Delaware on June 26, 1996.

         2. This Restated  Certificate of Incorporation  restates and integrates
and further amends the  certificate of  incorporation  of the  Corporation  (the
"Certificate  of  Incorporation"),  and has been duly adopted in accordance with
Sections  242 and 245 of the  General  Corporation  Law of the State of Delaware
(the "DGCL").

         3. The text of the Certificate of  Incorporation is hereby restated and
integrated and further amended to read in its entirety as set forth on Exhibit A
attached hereto and incorporated herein by this reference.

         IN WITNESS  WHEREOF,  the Corporation has caused this Certificate to be
duly executed and acknowledged in accordance with Section 103 of the DGCL.

                                                      ORION NEWCO SERVICES, INC.


                                                      By:
                                                         -----------------------

                                                      Name:
                                                           ---------------------

                                                      Title:
                                                            --------------------

<PAGE>

                      RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                           ORION NEWCO SERVICES, INC.


                FIRST: The name of the Corporation is Orion Newco Services, Inc.
(hereinafter called the "Corporation").

                SECOND: The registered office of the Corporation in the State of
Delaware  is 1209  Orange  Street,  Wilmington,  Delaware  19801,  County of New
Castle.  The name of the  Corporation's  registered agent at said address is The
Corporation Trust Company.

                THIRD: The purpose of the Corporation is to engage in any lawful
acts or activities  for which  corporations  may be organized  under the General
Corporation Law of Delaware.

                FOURTH:  The total number of shares of all classes of stock that
the Corporation shall have authority to issue is Forty-One Million  (41,000,000)
shares,  consisting of Forty Million  (40,000,000)  shares of common stock,  par
value $.01 per share, and One Million (1,000,000) shares of preferred stock, par
value $.01 per share.

                A. Common Stock.  Each holder of shares of common stock shall be
entitled  to one vote for each  share of  common  stock  held of  record  on all
matters on which the holders of common stock are  entitled to vote.  There shall
be no cumulative voting rights for the election of directors.

                B.  Preferred  Stock.  The  Board of  Directors  is  authorized,
subject to limitations  prescribed by the Delaware  General  Corporation Law and
the provisions of this Article  FOURTH to provide,  by resolution or resolutions
from time to time adopted without  further  stockholder  approval,  and filing a
Certificate  pursuant  to  the  applicable  provision  of the  Delaware  General
Corporation Law, for the issuance of the shares of Preferred Stock in series, to
establish  from time to time the  number of shares to be  included  in each such
series, and to fix the designation,  powers,  preferences and such rights of the
shares of each such series and the qualifications,  limitations and restrictions
thereof.  The  authority of the Board of  Directors  with respect to each series
shall include, but not be limited to, determination of the following:

                1.  The  number  of  shares  constituting  that  series  and the
distinctive designation of that series.

                                       1

<PAGE>

                2. The  dividend  rate on the  shares  of that  series,  whether
dividends  shall be  cumulative,  and, if so, from which date or dates,  and the
relative  rights of priority,  if any, of payment of dividends on shares of that
series;

                3. Whether that series shall have voting rights,  in addition to
the voting rights provided by law, and, if so, the terms of such voting rights;

                4. Whether that series shall have conversion privileges, and, if
so,  the  terms and  conditions  of such  conversion,  including  provision  for
adjustment of the conversion rate in such events as the Board of Directors shall
determine;

                5. Whether or not the shares of that series shall be redeemable,
and, if so, the terms and  conditions  of such  redemption,  including the dates
upon or after which they shall be  redeemable,  and the amount per share payable
in case of redemption,  which amount may vary under different  conditions and at
different redemption dates;

                6.  Whether  that  series  shall  have a  sinking  fund  for the
redemption  or  purchase  of shares of that  series,  and,  if so, the terms and
amount of such sinking fund;

                7. The  rights  of the  shares  of that  series  in the event of
voluntary  or  involuntary  liquidation,   dissolution  or  winding  up  of  the
Corporation,  and the relative rights of priority,  if any, of payment of shares
of that series; and

                8. Any other relative  rights,  preferences  and  limitations of
that series.

                FIFTH:  The name and mailing  address of the  incorporator  (the
"Incorporator") are Daniel M. Pattarini,  555 Thirteenth Street, NW, Washington,
D.C. 20004.  The powers of the  Incorporator  shall terminate upon the filing of
this Certificate of  Incorporation,  and the names and mailing  addresses of the
persons who are to serve as the  directors  of the  Corporation  until the first
annual meeting of the  stockholders of the Corporation or until their successors
are elected and qualified are as follows:



      NAME                                MAILING ADDRESS

W. Neil Bauer                             2440 Research Boulevard
                                          Rockville, MD 20850

                                       2

<PAGE>

David J. Frear                            2440 Research Boulevard
                                          Rockville, MD 20850

Richard H. Shay                           2440 Research Boulevard
                                          Rockville, MD 20850

                SIXTH:  The authorized  number of directors of this  corporation
shall be not less than 3 and not more than 15.  The number of  directors  within
this range shall be stated in the  Corporation's  Bylaws, as may be amended from
time to time.  When the number of  directors  is changed the Board of  Directors
shall determine the class or classes to which the increased or decreased  number
of directors  shall be  apportioned;  provided  that the directors in each class
shall be as nearly  equal in number as  possible.  No  decrease in the number of
directors  shall  have  the  effect  of  shortening  the  term of any  incumbent
director.

                Effective as of the annual meeting of  stockholders in 1997, the
Board of Directors  shall be divided into three classes,  designated as Class I,
Class II, and Class III, as nearly equal in number as possible,  and the term of
office  of  directors  of one  class  shall  expire at each  annual  meeting  of
stockholders, and in all cases until their successors shall be elected and shall
qualify,  or until their  earlier  resignation,  removal from  office,  death or
incapacity.  The  initial  term of office of Class I shall  expire at the annual
meeting of  stockholders  in 1998,  that of Class II shall  expire at the annual
meeting in 1999,  and that of Class III shall  expire at the  annual  meeting in
2000, and in all cases as to each director until his successor  shall be elected
and shall qualify, or until his earlier resignation,  removal from office, death
or incapacity.

                Subject to the foregoing, at each annual meeting of stockholders
the  successors to the class of directors  whose term shall then expire shall be
elected  to hold  office  for a term  expiring  at the third  succeeding  annual
meeting and until their successors shall be elected and qualified.

                The  directors  remaining in office  acting by a majority  vote,
although  less  than a  quorum,  or by a sole  remaining  director,  are  hereby
expressly  delegated  the power to fill any vacancies in the Board of Directors,
however  occurring,  whether by an increase in the number of  directors,  death,
resignation, retirement, disqualification, removal from office or otherwise, and
any director so chosen  shall hold office  until the next  election of the class
for which such  director  shall have been chosen and until his  successor  shall
have been elected and qualified, or until his earlier resignation,  removal from
office death or incapacity.

                                       3

<PAGE>

                SEVENTH:  In  furtherance  and not in  limitation  of the powers
conferred  by the laws of the State of  Delaware,  the Board of Directors of the
Corporation  is expressly  authorized  and empowered to adopt,  amend and repeal
bylaws of the Corporation.

                EIGHTH:  No director of the  Corporation  shall be liable to the
Corporation  or its  stockholders  for monetary  damages for breach or fiduciary
duty as a director, provided that nothing contained in this Article EIGHTH shall
eliminate  or limit  the  liability  of a  director  (i) for any  breach  of the
director's duty of loyalty to the Corporation or its stockholders, (ii) for acts
or omissions  not in good faith or which  involve  intentional  misconduct  or a
knowing  violation  of law,  (iii)  under  Section 174 of the  Delaware  General
Corporation  Law, or (iv) for any transaction from which the director derived an
improper personal benefit.

                NINTH:  The Corporation  reserves the right at any time and from
time to time, to amend,  alter, change or repeal any provision contained in this
Certificate of Incorporation and other provisions  authorized by the laws of the
State of Delaware at the time in force may be added or  inserted,  in the manner
now or hereafter  prescribed by law, except that Articles FOURTH,  FIFTH, TENTH,
ELEVENTH,  TWELFTH,  THIRTEENTH,  FOURTEENTH  and this Article  NINTH may not be
altered,  amended,  or  repealed  except  by the  affirmative  vote of at  least
two-thirds (2/3) of the shares entitled to vote thereon and the affirmative vote
of the  Board of  Directors;  and all  rights,  preferences  and  privileges  of
whatsoever  nature conferred upon  stockholders,  directors or any other persons
whomsoever by and pursuant to this  Certificate of  Incorporation in its present
form or as hereafter  amended are granted subject to the rights reserved in this
Article NINTH.

                TENTH:  Notwithstanding  any other provision of this Certificate
of Incorporation to the contrary, outstanding shares of stock of the Corporation
shall always be subject to redemption by the Corporation, by action of the Board
of Directors, if in the judgment of the Board of Directors such action should be
taken, pursuant to Section 151(b) of the Delaware General Corporation Law or any
other  applicable  provision of law, to the extent necessary to prevent the loss
or secure the  reinstatement  of any license or franchise from any  governmental
agency held by the Corporation or any of its subsidiaries to conduct any portion
of the business of the Corporation or any of its subsidiaries,  which license or
franchise is  conditioned  upon some or all of the holders of the  Corporation's
stock  possessing  prescribed  qualifications.  The terms and conditions of such
redemption shall be as follows:

                (a) the redemption  price of the shares to be redeemed  pursuant
                to this  Article  TENTH  shall  be  determined  by the  Board of
                Directors  and shall be at least  equal to the lesser of (i) the
                Redemption  Value or (ii) if such  stock was  purchased  by such
                Disqualified  Holders  within one year 

                                       4

<PAGE>


                of the Redemption  Date,  such  Disqualified  Holder's  purchase
                price for such shares;

                (b) the  redemption  price of such  shares  may be paid in cash,
                Redemption Securities or any combination thereof;

                (c) if less than all the shares held by Disqualified Holders are
                to be redeemed,  the shares to be redeemed  shall be selected in
                such manner as shall be  determined  by the Board of  Directors,
                which may include selection first of the most recently purchased
                shares  thereof,  selection  by lot or  selection  in any  other
                manner determined by the Board of Directors;

                (d) at least 30 days'  written  notice  of the  Redemption  Date
                shall be given to the record  holders of the shares  selected to
                be  redeemed  (unless  waived in  writing  by any such  holder),
                provided  that  the  Redemption  Date  may be the  date on which
                written  notice shall be given to record  holders if the cash or
                Redemption  Securities  necessary to effect the redemption shall
                have been  deposited  in trust for the  benefit  of such  record
                holders  and  subject  to  immediate  withdrawal  by  them  upon
                surrender  of the  stock  certificates  of  their  shares  to be
                redeemed;

                (e) from and after the  Redemption  Date,  any and all rights of
                whatever  nature  which  may be held  by the  owners  of  shares
                selected for redemption (including without limitation any rights
                to vote or  participate  in  dividends  declared on stock of the
                same class or series as such shares)  shall cease and  terminate
                and such owners shall  thenceforth  be entitled  only to receive
                the cash or Redemption Securities payable upon redemption; and

                (f) such other terms and  conditions  as the Board of  Directors
                shall determine.

                For purposes of this Article TENTH:

                                  (i)  "Disqualified   Holder"  shall  mean  any
                         holder  of  shares  of stock of the  Corporation  whose
                         holding  of such  stock,  either  individually  or when
                         taken  together  with the holding of shares of stock of
                         the  Corporation by any other holders,  may result,  in
                         the judgment of the Board of Directors, in the loss of,
                         or the  failure  to secure  the  reinstatement  of, any
                         license or franchise from any governmental  agency held
                         by  the  Corporation  on any  of  its  subsidiaries  to
                         conduct any portion of the business of the  Corporation
                         or any of its subsidiaries.

                                       5

<PAGE>

                                  (ii)  "Redemption  Value"  of a  share  of the
                         Corporation's  stock of any class or series  shall mean
                         the average  Closing Price for such a share for each of
                         the 45 most  recent  days on which  shares  of stock of
                         such class or series  shall have been traded  preceding
                         the day on which  notice of  redemption  shall be given
                         pursuant  to  paragraph  (d)  of  this  Article  TENTH;
                         provided,  however,  that if  shares  of  stock of such
                         class  or  series  are  not  traded  on any  securities
                         exchange or in the over-the-counter market, "Redemption
                         Value" shall be determined by the Board of Directors in
                         good  faith.  "Closing  Price"  on any  day  means  the
                         reported  closing  sales price or, in case no such sale
                         takes place,  the average of the  reported  closing bid
                         and  asked  prices  on  the  principal   United  States
                         securities  exchange  registered  under the  Securities
                         Exchange Act of 1934 on which such stock is listed, or,
                         if such stock is not listed on any such  exchange,  the
                         highest  closing  sales price or bid quotation for such
                         stock  on  the  National   Association   of  Securities
                         Dealers, Inc. Automated Quotations System or any system
                         then in use,  or if no such  prices or  quotations  are
                         available, the fair market value on the day in question
                         as determined by the Board of Directors in good faith.

                                  (iii)  "Redemption  Date"  shall mean the date
                         fixed by the Board of Directors  for the  redemption of
                         any shares of stock of the Corporation pursuant to this
                         Article TENTH.

                                  (iv)  "Redemption  Securities"  shall mean any
                         debt or equity  securities of the  Corporation,  any of
                         its  subsidiaries  or  any  other  corporation,  or any
                         combination  thereof,  having such terms and conditions
                         (including,  without  limitation,  in the  case of debt
                         securities,  repayment  over a period  of up to  thirty
                         years,  or a longer period) as shall be approved by the
                         Board of Directors and which, together with any cash to
                         be paid as part of the redemption price, in the opinion
                         of any nationally  recognized  investment  banking firm
                         selected by the Board of Directors (which may be a firm
                         which provides other investment  banking,  brokerage or
                         other services to the Corporation), has a value, at the
                         time  notice  of  redemption   is  given   pursuant  to
                         paragraph  (d) of this  Article,  at least equal to the
                         price  required to be paid pursuant to paragraph (a) of
                         this Article TENTH (assuming, in the case of Redemption
                         Securities  to  be  publicly  traded,  such  Redemption
                         Securities  were fully  distributed and subject only to
                         normal trading activity).

                                       6

<PAGE>

                ELEVENTH:  Control Share Acquisitions

                A. Control Shares.  As used in this Article  ELEVENTH,  "control
share"  means shares of the  Corporation  that would have voting power that when
added to all the other shares of the Corporation owned by a person or in respect
to which that person may exercise or direct the exercise of voting power,  would
entitle that person,  immediately  after  acquisition of the shares (directly or
indirectly,  alone or as part of a group), to exercise or direct the exercise of
the voting power of the  Corporation in the election of directors  within any of
the following ranges of voting power:

                (1) One-fifth or more but less that a third of all voting power.

                (2)  One-third  or more but less than a  majority  of all voting
         power.

                (3) A majority or more of all voting power.


                B.       Control Share Acquisition.

                1. As used in this Article ELEVENTH, "control share acquisition"
means the acquisition (directly or indirectly) by any person of ownership of, or
the power to direct the  exercise of voting  power with  respect to,  issued and
outstanding control shares.

                2. For purposes of this Article ELEVENTH, shares acquired within
ninety (90) days or shares  acquired  pursuant to a plan to make a control share
acquisition are considered to have been acquired in the same acquisition.

                3. For purposes of this Article ELEVENTH,  a person who acquires
shares in the  ordinary  course of  business  for the  benefit of others in good
faith and not for the purpose of circumventing  this Article ELEVENTH has voting
power only of shares in respect of which that  person  would be able to exercise
or direct the vote without further instruction from others.

                4. The  acquisition  of any shares of the  Corporation  does not
constitute a control share  acquisition if the acquisition is consummated in any
of the following circumstances:

                (1) Before April 1, 1992.

                (2)  Pursuant to a binding  contract  existing  before  April 1,
         1992.

                                       7

<PAGE>

                (3) Pursuant to the laws of descent and distribution.

                (4) Pursuant to the  satisfaction  of a pledge or other security
         interest created in good faith and not for the purpose of circumventing
         this Article ELEVENTH.

                (5)  Pursuant  to a  merger  or plan of  share  exchange  if the
         Corporation  is a party to the  agreement  of  merger  of plan of share
         exchange.

                (6) Pursuant to a tender or exchange offer that is made pursuant
         to an agreement to which the Corporation is a party.

                (7)  Directly  from the  Corporation,  or from any of its wholly
         owned subsidiaries.


                5. The  acquisition  of any  shares of the  Corporation  in good
faith and not for the purpose of circumventing  this Article ELEVENTH by or from
(1)  any  person  whose  voting  rights  had  previously   been   authorized  by
stockholders in compliance with this Article  ELEVENTH,  or (2) any person whose
previous  acquisition  of shares of the  Corporation  would have  constituted  a
control share acquisition but for the  circumstances  specified in the paragraph
above, does not constitute a control share  acquisition,  unless the acquisition
entitles the person  (directly or indirectly,  alone or as a part of a group) to
exercise  or direct  the  exercise  of voting  power of the  Corporation  in the
election of directors in excess of the voting power otherwise authorized.

                         C. Interested Shares. As used in this Article ELEVENTH,
"interested  shares" mean the shares of the  Corporation in respect of which any
of the following persons may exercise or direct the exercise of the voting power
of the Corporation in the election of directors:

                (1) An  acquiring  person or member of a group with respect to a
         control share acquisition.

                (2) Any officer of the Corporation.

                (3) Any  employee of the  Corporation  who is also a director of
         the Corporation.


                D. Acquiring Person  Statement.  Any person who proposes to make
or has made a control share  acquisition may at the person's election deliver an

                                       8

<PAGE>

acquiring  person  statement to the Corporation at the  Corporation's  principal
office. The acquiring person statement must set forth all of the following:

                (1) The identity of the  acquiring  person and each other member
         of any group of which the person is a part for purposes of  determining
         control shares.

                (2) A statement  that the  acquiring  person  statement is given
         pursuant to this Article ELEVENTH.

                (3) The number of shares of the  Corporation  owned (directly or
         indirectly) by the acquiring person and each other member of the group.

                (4) The range of voting  power  under  which the  control  share
         acquisition falls or would, if consummated, fall.

                (5) If the control share acquisition has not taken place:

                    (a) a description  in reasonable  detail of the terms of the
                    proposed control share acquisition; and

                    (b) representations of the acquiring person, together with a
                    statement in reasonable  detail of the facts upon which they
                    are based, that the proposed control share  acquisition,  if
                    consummated,  will  not be  contrary  to law  and  that  the
                    acquiring  person  has  the  financial  capacity  to make to
                    proposed control share acquisition.


                E.       Special Meeting of Stockholders.

                    1.  If the  acquiring  person  so  requests  at the  time of
delivery of an acquiring  person  statement and gives an  undertaking to pay the
Corporation's  expenses of a special  meeting,  within ten (10) days thereafter,
the  directors  of  the  Corporation   shall  call  a  special  meeting  of  the
stockholders of the Corporation for the purpose of considering the voting rights
to be  accorded to the shares  acquired  or to be acquired in the control  share
acquisition.

                    2. Unless the acquiring  person agrees in writing to another
date, the special  meeting of the  stockholders  shall be held within fifty (50)
days after the receipt by the Corporation of the request.

                    3. If no request is made,  the voting  rights to be accorded
the shares acquired in the control share

                                       9


<PAGE>

acquisition  shall be  presented  at the  next  special  or  annual  meeting  of
stockholders.

                    4. If the  acquiring  person so  requests  in writing at the
time of the delivery of the acquiring person statement, the special meeting must
not be held sooner than thirty (30) days after the receipt by the Corporation of
the acquiring person's statement.

                F.  Notice.
                    ------

                    1. If a special meeting is requested,  notice of the special
meeting of stockholders shall be given as promptly as reasonably  practicable by
the Corporation to all  stockholders of record as of the record date set for the
meeting, whether or not entitled to vote at the meeting.

                    2.  Notice of the special or annual  stockholder  meeting at
which the voting rights are to be considered  must include or be  accompanied by
both of the following:

                                  (1) a copy of the acquiring  person  statement
                        delivered  to the  Corporation  pursuant to this Article
                        ELEVENTH.

                                  (2) A statement by the Board of the  Directors
                        of the Corporation,  authorized by its directors, of its
                        position  or  recommendation,  or that it is  taking  no
                        position or making no  recommendation,  with  respect to
                        the proposed control share acquisition.


                G.  Voting Rights.
                    -------------

                    1. Control  shares  acquired in a control share  acquisition
have the same voting rights as were accorded the shares before the control share
acquisition  only  to  the  extent  granted  by  resolutions   approved  by  the
stockholders of the Corporation.

                    2. To be adopted under this section,  the resolutions  shall
be  approved by a majority of all the votes which could be cast in a vote on the
election  of  directors  by all the  outstanding  shares  other than  interested
shares.  Interested  shares shall not be entitled to vote on the matter,  and in
determining whether a quorum exists, all interested shares shall be disregarded.
For the purpose of this subsection,  the interested share shall be determined as
of the record  date for  determining  the  stockholders  entitled to vote at the
meeting.

                H.  Redemption.
                    ----------

                                       10

<PAGE>

                    1. Control  shares  acquired in a control share  acquisition
with  respect to which no  acquiring  person  statement  has been filed with the
Corporation  may, at any time during the period ending sixty (60) days after the
last  acquisition  of  control  shares by the  acquiring  person,  be subject to
redemption by the  Corporation at the redemption  price specified in paragraph 3
of this subsection.

                    2. Control  shares  acquired in a control share  acquisition
are not subject to redemption after an acquiring person statement has been filed
unless the shares are not accorded  full voting  rights by the  stockholders  as
provided above.

                    3. The redemption price for shares to be redeemed under this
section  shall be the number of such  shares  multiplied  by the  dollar  amount
(rounded to the nearest  cent) equal to the average per share  price,  including
any brokerage commissions,  transfer taxes and soliciting dealer's fees, paid by
the acquiring person for such shares.  The Corporation may rely  conclusively on
public  announcements by, or filings with the Securities and Exchange Commission
by, the acquiring person as to the prices so paid.

                I.  Dissenters Rights.
                    -----------------

                    1. In the event control  shares  acquired in a control share
acquisition  are  accorded  full  voting  rights  and the  acquiring  person has
acquired  control  shares  with a  majority  or more of all  voting  power,  all
shareholders of the Corporation, other than the acquiring person, have the right
to dissent from the granting of voting rights and to demand  payment of the fair
value of their shares under Section 262 of the Delaware General  Corporation Law
as though such  granting of voting rights were a corporate  action  described in
paragraph (b) of Section 262,  except that the  provisions of subsection  (1) of
paragraph (b) of Section 262 shall not be applicable.

                    2. For purposes of this section "fair value" of shares under
Section 262 of the Delaware  General  Corporation  Law shall in no event be less
than the  highest  price per share paid in the  control  share  acquisition,  as
adjusted for any subsequent  stock  dividends or reverse stock splits or similar
changes.

                TWELFTH:  Certain Business Combinations

                A.  Vote Required for Certain Business Combinations.
                    -----------------------------------------------

                    1.  Higher  Vote  for  Certain  Business  Combinations.   In
                        addition to any affirmative vote required by law or this
                        Certificate  of  Incorporation,  and except as otherwise

                                       11
  

<PAGE>

                        expressly  provided  in  subsection  B of  this  Article
                        TWELFTH:

                                  (a)      any  merger or  consolidation  of the
                                           Corporation  or  any  Subsidiary  (as
                                           hereinafter  defined)  with  (i)  any
                                           Interested       Stockholder      (as
                                           hereinafter   defined)  or  (ii)  any
                                           other  corporation  (whether  or  not
                                           itself  an  Interested   Stockholder)
                                           which  is,  or after  such  merger or
                                           consolidation  would be, an Affiliate
                                           (as   hereinafter   defined)   of  an
                                           Interested Stockholder; or

                                  (b)      any sale, lease, exchange,  mortgage,
                                           pledge, transfer or other disposition
                                           (in one  transaction  or a series  of
                                           transactions)    to   or   with   any
                                           Interested    Stockholder    or   any
                                           Affiliate    of    any     Interested
                                           Stockholder  of  any  assets  of  the
                                           Corporation or any Subsidiary  having
                                           an  aggregate  Fair Market  Value (as
                                           hereinafter defined) of $1,000,000 or
                                           more, or

                                  (c)      the   issuance  or  transfer  by  the
                                           Corporation or any Subsidiary (in one
                                           transaction    or   a    series    of
                                           transactions)  of any  securities  of
                                           the  Corporation or any Subsidiary to
                                           any  Interested  Stockholder  or  any
                                           Affiliate    of    any     Interested
                                           Stockholder  in  exchange  for  cash,
                                           securities  or other  property  (or a
                                           combination    thereof)   having   an
                                           aggregate   Fair   Market   Value  of
                                           $1,000,000 or more; or

                                  (d)      the  adoption of any plan or proposal
                                           for the liquidation or dissolution of
                                           the  Corporation  proposed  by  or on
                                           behalf of an  Interested  Stockholder
                                           or any  Affiliate  of any  Interested
                                           Stockholder; or

                                  (e)      any  reclassification  of  securities
                                           (including  any reverse stock split),
                                           or     recapitalization     of    the
                                           Corporation,   or   any   merger   or
                                           consolidation of the Corporation with
                                           any of its  Subsidiaries or any other
                                           transaction  (whether  or not with or
                                           into  or   otherwise   involving   an
                                           Interested Stockholder) which has the
                                           effect,  directly or  indirectly,  of
                                           increasing the proportionate share of
                                           the  outstanding  shares of any class
                                           of equity or  convertible  securities
                                           of the  Corporation or any Subsidiary
                                           which is directly or 


                                       12

<PAGE>

                                           indirectly  owned  by any  Interested
                                           Stockholder  or any  Affiliate of any
                                           Interested Stockholder;

                                  shall require the affirmative  vote of (A) the
                                  holders of at least a  majority  of the voting
                                  power  of  the  then  outstanding   shares  of
                                  capital stock of the  Corporation  entitled to
                                  vote  generally  in the  election of directors
                                  (the  "Voting  Stock"),  voting  together as a
                                  single class and (B) the holders of at least a
                                  majority of the Voting Stock,  voting together
                                  as a single  class,  excluding for purposes of
                                  calculating  both the affirmative vote and the
                                  number of  outstanding  shares of Voting Stock
                                  all  shares  of  Voting  Stock  of  which  the
                                  beneficial owner is an Interested  Stockholder
                                  or any Affiliate of an Interested  Stockholder
                                  referred to in clauses (a) through (e) in this
                                  paragraph  1. Such  affirmative  vote shall be
                                  required notwithstanding the fact that no vote
                                  may be required,  or that a lesser  percentage
                                  may be specified, by law.

                 2.   "Definition of "Business Combination."  The term "Business
                                  Combination"  as used in this Article  TWELFTH
                                  shall mean any  transaction  which is referred
                                  to in any one or more of clauses  (a)  through
                                  (e) of paragraph 1 of this subsection A.

                B.       When Higher Vote is Not  Required.  The  provisions  of
                         subsection  A of  this  Article  TWELFTH  shall  not be
                         applicable to any particular Business Combination,  and
                         such  Business  Combination  shall  require  only  such
                         affirmative  vote as is  required  by law and any other
                         provision of this Certificate of Incorporation,  if all
                         of the conditions  specified in either of the following
                         paragraphs 1 and 2 are met:

                 1.   Approval by Continuing Directors. The Business Combination
                         shall  have  been   approved   by  a  majority  of  the
                         Continuing Directors (as hereinafter defined).

                 2.   Price and Procedure Requirements.   All  of  the following
                         conditions shall have been met:

                                  (a)      The aggregate  amount of the cash and
                                           the Fair Market Value (as hereinafter
                                           defined)   as  of  the  date  of  the
                                           consummation    of    the    Business
                                           Combination  of  consideration  other
                                           than cash to be received per 

                                       13



<PAGE>

                                           share by holders  of common  stock in
                                           such Business Combination shall be at
                                           least  equal  to the  highest  of the
                                           following:

                                           (i) (if  applicable)  the highest per
                                           share price  (including any brokerage
                                           commissions,   transfer   taxes   and
                                           soliciting dealers' fees) paid by the
                                           Interested Stockholder for any shares
                                           of common  stock  acquired  by it (A)
                                           within    the     two-year     period
                                           immediately prior to the first public
                                           announcement  of the  proposal of the
                                           Business       Combination       (the
                                           "Announcement  Date")  or  (B) in the
                                           transaction  in  which it  became  an
                                           Interested Stockholder,  whichever is
                                           higher; or

                                           (ii) the Fair Market  Value per share
                                           of common  stock on the  Announcement
                                           Date  or on the  date  on  which  the
                                           Interested   Stockholder   became  an
                                           Interested  Stockholder  (such latter
                                           date is referred  to in this  Article
                                           TWELFTH as the "Determination Date"),
                                           whichever is higher.

                                  (b)      The aggregate  amount of the cash and
                                           the Fair Market  Value as of the date
                                           of the  consummation  of the Business
                                           Combination  of  consideration  other
                                           than cash to be received per share by
                                           holders of shares of any other  class
                                           of outstanding  Voting Stock shall be
                                           at least  equal to the highest of the
                                           following (it being intended that the
                                           requirements  of this  paragraph 2(b)
                                           shall  be  required  to be  met  with
                                           respect to every class of outstanding
                                           Voting  Stock,  whether  or  not  the
                                           Interested Stockholder has previously
                                           acquired  any shares of a  particular
                                           class of Voting Stock):

                                           (i) (if  applicable)  the highest per
                                           share price  (including any brokerage
                                           commissions,   transfer   taxes   and
                                           soliciting dealers' fees) paid by the
                                           Interested Stockholder for any shares
                                           of  such   class  of   Voting   Stock
                                           acquired   by  it  (A)   within   the
                                           two-year period  immediately prior to
                                           the  Announcement  Date or (B) in the
                                           transaction  in  which it  became  an
                                           Interested Stockholder,  whichever is
                                           higher;

                                       14

<PAGE>

                                           (ii)  (if   applicable)  the  highest
                                           preferential   amount  per  share  to
                                           which the  holders  of shares of such
                                           class of Voting Stock are entitled in
                                           the   event  of  any   voluntary   or
                                           involuntary liquidation,  dissolution
                                           or winding up of the Corporation; and

                                           (iii) The Fair Market Value per share
                                           of such class of Voting  Stock on the
                                           Announcement    Date    or   on   the
                                           Determination   Date,   whichever  is
                                           higher.

                                  (c)      The  consideration  to be received by
                                           holders  of  a  particular  class  of
                                           Voting Stock (including common stock)
                                           in the Business  Combination shall be
                                           in  cash or in the  same  form as the
                                           Interested Stockholder has previously
                                           paid for shares of such Voting Stock.
                                           If  the  Interested  Stockholder  has
                                           paid  for  shares  of  any  class  of
                                           Voting  Stock with  varying  forms of
                                           consideration,     the     form    of
                                           consideration  for such Voting  Stock
                                           shall be either cash or the form used
                                           to  acquire  the  largest  number  of
                                           shares   of   such    Voting    Stock
                                           previously acquired by it.

                                  (d)      After such Interested Stockholder has
                                           become an Interested  Stockholder and
                                           prior  to the  consummation  of  such
                                           Business Combination: (i) there shall
                                           have  been  (A) no  reduction  in the
                                           annual rate of dividends  paid on the
                                           capital stock (except as necessary to
                                           reflect   any   subdivision   of  the
                                           capital stock), except as approved by
                                           a   majority   of   the    Continuing
                                           Directors,  and  (B) an  increase  in
                                           such  annual  rate  of  dividends  as
                                           necessary      to     reflect     any
                                           reclassification    (including    any
                                           reverse         stock         split),
                                           recapitalization,  reorganization  or
                                           any similar transaction which has the
                                           effect  of  reducing  the  number  of
                                           outstanding  shares of common  stock,
                                           unless  the  failure  so to  increase
                                           such  annual  rate is  approved  by a
                                           majority of the Continuing Directors;
                                           and (ii) such Interested  Stockholder
                                           shall have not become the  beneficial
                                           owner  of any  additional  shares  of
                                           Voting  Stock  except  as part of the
                                           transaction  which  results  in  such
                                           Interested  Stockholder  becoming  an
                                           Interested Stockholder.

                                       15
<PAGE>


                                  (e)      After such Interested Stockholder has
                                           become  an  Interested   Stockholder,
                                           such Interested Stockholder shall not
                                           have  received the benefit,  directly
                                           or indirectly (except proportionately
                                           as  a  stockholder),  of  any  loans,
                                           advances,   guarantees,   pledges  or
                                           other financial assistance or any tax
                                           credits   or  other  tax   advantages
                                           provided by the Corporation,  whether
                                           in  anticipation  of or in connection
                                           with  such  Business  Combination  or
                                           otherwise.

                                  (f)      A  proxy  or  information   statement
                                           describing   the  proposed   Business
                                           Combination  and  complying  with the
                                           requirements    of   the   Securities
                                           Exchange  Act of 1934 (the  "Exchange
                                           Act") and the  rules and  regulations
                                           thereunder    (or   any    subsequent
                                           provisions  replacing such Act, rules
                                           or  regulations)  shall be  mailed to
                                           public     stockholders     of    the
                                           Corporation at least 20 days prior to
                                           the  consummation  of  such  Business
                                           Combination   (whether  or  not  such
                                           proxy  or  information  statement  is
                                           required  to be  mailed  pursuant  to
                                           such Act or subsequent provisions).

                C.       Certain Definitions.   For the purposes of this Article
                         TWELFTH:

                         1.       A "person"  shall mean any  individual,  firm,
                                  corporation or other entity.

                         2.       "Interested Stockholder" shall mean any person
                                  (other than the Corporation or any Subsidiary)
                                  who or which:

                                  (a)      is the beneficial owner,  directly or
                                           indirectly,  of more  than 20% of the
                                           voting   power  of  the   outstanding
                                           Voting Stock; or

                                  (b)      is an  Affiliate  of the  Corporation
                                           and at any time  within the  two-year
                                           period  immediately prior to the date
                                           in question was the beneficial owner,
                                           directly  or  indirectly,  of  20% or
                                           more of the voting  power of the then
                                           outstanding Voting Stock; or

                                  (c)      is an  assignee  of or has  otherwise
                                           succeeded  to any  shares  of  Voting
                                           Stock  which were at any time  within
                                           the two-year period immediately prior
                                           to the 

                                       16

<PAGE>

                                           date in question  beneficially  owned
                                           by  any  Interested  Stockholder,  if
                                           such  assignment or succession  shall
                                           have  occurred  in  the  course  of a
                                           transaction or series of transactions
                                           not   involving  a  public   offering
                                           within the meaning of the  Securities
                                           Act of 1933.

                         3.       A  person shall be a "beneficial owner" of any
                                  Voting Stock:

                                  (a)      which  such  person  or  any  of  its
                                           Affiliates    or    Associates    (as
                                           hereinafter   defined)   beneficially
                                           owns, directly or indirectly; or

                                  (b)      which  such  person  or  any  of  its
                                           Affiliates or Associates  has (i) the
                                           right to acquire  (whether such right
                                           is  exercisable  immediately  or only
                                           after the passage of time),  pursuant
                                           to  any  agreement,   arrangement  or
                                           understanding or upon the exercise of
                                           conversion  rights,  exchange rights,
                                           warrants or options, or otherwise, or
                                           (ii) the  right to vote  pursuant  to
                                           any    agreement,    arrangement   or
                                           understanding; or

                                  (c)      which   are    beneficially    owned,
                                           directly or indirectly,  by any other
                                           person  with which such person or any
                                           of its  Affiliates or Associates  has
                                           any    agreement,    arrangement   or
                                           understanding   for  the  purpose  of
                                           acquiring,    holding,    voting   or
                                           disposing  of any  shares  of  Voting
                                           Stock.

                         4.       For the  purposes  of  determining  whether  a
                                  person is an Interested  Stockholder  pursuant
                                  to  paragraph  2 of  this  subsection  C,  the
                                  number of shares of Voting  Stock deemed to be
                                  outstanding  shall include shares deemed owned
                                  through  application  of  paragraph  3 of this
                                  subsection  C but shall not  include any other
                                  shares of Voting  Stock  which may be issuable
                                  pursuant  to  any  agreement,  arrangement  or
                                  understanding,  or upon exercise of conversion
                                  rights, warrants or options, or otherwise.

                         5.       "Affiliate"  or  "Associate"  shall  have  the
                                  respective  meanings ascribed to such terms in
                                  Rule   l2b-2   of  the   General   Rules   and
                                  Regulations under the Exchange Act.

                                       17

<PAGE>

                         6.       "Subsidiary"  means any corporation of which a
                                  majority  of any class of equity  security  is
                                  owned,   directly   or   indirectly,   by  the
                                  Corporation;  provided,  however, that for the
                                  purposes  of  the   definition  of  Interested
                                  Stockholder  set forth in  paragraph 2 of this
                                  subsection C, the term "Subsidiary" shall mean
                                  only a corporation of which a majority of each
                                  class of equity security is owned, directly or
                                  indirectly, by the Corporation.

                         7.       "Continuing  Director" means any member of the
                                  Board of Directors of the  Corporation  who is
                                  unaffiliated  with the Interested  Stockholder
                                  and was a member of the Board of  Directors of
                                  the  Corporation  prior to the  time  that the
                                  Interested  Stockholder  became an  Interested
                                  Stockholder, and any successor of a Continuing
                                  Director   who  is   unaffiliated   with   the
                                  Interested  Stockholder  and is recommended to
                                  succeed a Continuing Director by a majority of
                                  Continuing  Directors  then  on the  Board  of
                                  Directors of the Corporation.

                         8.       "Fair Market Value" means:

                                  (a)      in the  case of  stock,  the  highest
                                           closing  sale price during the 30-day
                                           period immediately preceding the date
                                           in  question of a share of such stock
                                           on  the   principal   United   States
                                           securities  exchange registered under
                                           the  Exchange Act on which such stock
                                           is  listed,  or, if such stock is not
                                           listed  on  any  such  exchange,  the
                                           highest  closing bid  quotation  with
                                           respect  to a  share  of  such  stock
                                           during  the 30-day  period  preceding
                                           the date in question on the  National
                                           Association  of  Securities  Dealers,
                                           Inc.  Automated  Quotations System or
                                           any system then in use, or if no such
                                           quotations  are  available,  the fair
                                           market  value on the date in question
                                           of  a   share   of  such   stock   as
                                           determined  by the Board of Directors
                                           of the Corporation in good faith; and

                                  (b)      In the case of  property  other  than
                                           cash or stock,  the fair market value
                                           of  such  property  on  the  date  in
                                           question as  determined  by the Board
                                           of  Directors of the  Corporation  in
                                           good faith.

                                       18

<PAGE>

                D.       Powers of the Board of  Directors.  A  majority  of the
                         directors of the  Corporation  shall have the power and
                         duty to  determine  for the  purposes  of this  Article
                         TWELFTH,  on the  basis  of  information  known to them
                         after  reasonable  inquiry,  (1) whether a person is an
                         Interested  Stockholder,  (2) the  number  of shares of
                         Voting  Stock  beneficially  owned by any  person,  (3)
                         whether  a  person  is an  Affiliate  or  Associate  of
                         another,  and (4)  whether  the  assets  which  are the
                         subject  of  any  Business  Combination  have,  or  the
                         consideration  to  be  received  for  the  issuance  or
                         transfer  of  securities  by  the  Corporation  or  any
                         Subsidiary in any Business Combination has an aggregate
                         Fair Market Value of $1,000,000 or more.

                E.       No  Effect  on  Fiduciary   Obligations  of  Interested
                         Stockholders. Nothing contained in this Article TWELFTH
                         shall  be   construed   to   relieve   any   Interested
                         Stockholder  from any fiduciary  obligation  imposed by
                         law.

                THIRTEENTH:  Indemnification.

                A. Authorization of Indemnification. Each person who was or is a
party or is threatened  to be made a party to or is involved in any  threatened,
pending or  completed  action,  suit or  proceeding,  whether  civil,  criminal,
administrative  or  investigative  and  whether  by  or  in  the  right  of  the
corporation or otherwise (a "proceeding"), by reason of the fact that he or she,
or a person of whom he or she is the legal representative,  is or was a director
or  officer  of the  corporation  or is or was  serving  at the  request  of the
corporation as a director,  officer, employee or agent of another corporation or
of a partnership,  joint venture,  trust or other enterprise,  including service
with respect to an employee  benefit plan, shall be (and shall be deemed to have
a contractual right to be) indemnified and held harmless by the corporation (and
any successor to the  corporation  by merger or otherwise) to the fullest extent
authorized  by, and subject to the  conditions  and (except as provided  herein)
procedures set forth in the Delaware General Corporation Law, as the same exists
or may hereafter be amended (but any such amendment shall not be deemed to limit
or prohibit the rights of  indemnification  hereunder for past acts or omissions
of  any  such  person  insofar  as  such  amendment   limits  or  prohibits  the
indemnification  rights that said law permitted the corporation to provide prior
to such  amendment),  against all expenses,  liabilities  and losses  (including
attorney's fees, judgments,  fines, ERISA taxes or penalties and amounts paid or
to be paid in  settlement)  reasonably  incurred  or  suffered by such person in
connection  therewith;  provided,  however, that the corporation shall indemnify
any such person seeking indemnification in connection with a proceeding (or part
thereof)  initiated  by such  person  (except  for a suit or action  pursuant to
subsection B only if such  proceeding  (or part  thereof) was  authorized by the
board of directors of the corporation. 

                                       19

<PAGE>

Persons who are not  directors or officers of the  corporation  may be similarly
indemnified  in respect of such service to the extent  authorized at any time by
the board of directors of the corporation. The indemnification conferred in this
subsection  A also shall  include the right to be paid by the  corporation  (and
such successor) the expenses (including attorney's fees) incurred in the defense
of or  other  involvement  in any  such  proceeding  in  advance  of  its  final
disposition  (including in the case of a director or former director expenses of
separate legal counsel,  up to a maximum of $50,000,  but only in the event that
the director or former director as the indemnified party reasonably  determines,
assuming  an outcome  unfavorable  to such  indemnified  party,  that there is a
reasonable  probability that such proceeding may materially and adversely affect
such  indemnified  party, or that there may be legal defenses  available to such
indemnified  party that are different from or in addition to those  available to
the  corporation);  provided,  however,  that, if and to the extent the Delaware
General  Corporation  Law  requires,  the  payment of such  expenses  (including
attorney's  fees)  incurred  by a  director  or  officer in advance of the final
disposition of a proceeding  shall be made only upon delivery to the corporation
of an  undertaking  by or on behalf of such  director  or  officer  to repay all
amounts  so paid in  advance  if it shall  ultimately  be  determined  that such
director or officer is not entitled to be indemnified under this subsection A or
otherwise; and provided further, that, such expenses incurred by other employees
and agents may be so paid in advance upon such terms and conditions,  if any, as
the board of directors deems appropriate.

                B. Right of Claimant to Bring Action against the Corporation. If
a  claim  under  subsection  A of  this  section  is not  paid  in  full  by the
corporation  within  sixty days after a written  claim has been  received by the
corporation, the claimant may at any time thereafter bring an action against the
corporation  to recover  the unpaid  amount of the claim and, if  successful  in
whole or in part, the claimant shall be entitled to be paid also the expenses of
prosecuting such action. It shall be a defense to any such action (other than an
action brought to enforce a claim for expenses  incurred in connection  with any
proceeding in advance of its final disposition  where the required  undertaking,
if any is required,  has been tendered to the corporation) that the claimant has
not met the  standards of conduct which make it  permissible  under the Delaware
General  Corporation  Law for the  corporation to indemnify the claimant for the
amount claimed or is otherwise not entitled to indemnification  under subsection
A of this  section  but the  burden  of  proving  such  defense  shall be on the
corporation.  The failure of the  corporation  (in the manner provided under the
Delaware General Corporation Law) to have made a determination prior to or after
the commencement of such action that  indemnification  of the claimant is proper
in the  circumstances  because  he or she  has met the  applicable  standard  of
conduct set forth in the Delaware General Corporation Law shall not be a defense
to the  action  or  create  a  presumption  that  the  claimant  has not met the
applicable standard of conduct.  An actual  determination by the corporation (in
the  manner  provided  under the  Delaware  

                                       20

<PAGE>

General Corporation Law) after the commencement of such action that the claimant
has not met such  applicable  standard of conduct  shall not be a defense to the
action,  but  shall  create  a  presumption  that the  claimant  has not met the
applicable standard of conduct.

                C.  Non-exclusivity.  The rights to indemnification  and advance
payment of expenses provided by subsection A of this section shall not be deemed
exclusive of any other rights to which those seeking indemnification and advance
payment  of  expenses  may be  entitled  under  any  bylaw,  agreement,  vote of
stockholders or disinterested  directors or otherwise,  both as to action in his
or her official capacity and as to action in another capacity while holding such
office.

                D. Survival of Indemnification.  The indemnification and advance
payment of expenses  and rights  thereto  provided  by, or granted  pursuant to,
subsection A of this section shall, unless otherwise provided when authorized or
ratified,  continue  as to a person  who has ceased to be a  director,  officer,
employee   or  agent  and  shall   inure  to  the   benefit   of  the   personal
representatives, heirs, executors and administrators of such person.

                E. Insurance.  The corporation  shall have power to purchase and
maintain  insurance  on behalf of any person who is or was a director,  officer,
employee or agent of the corporation, or is or was serving at the request of the
corporation as a director,  officer, employee or agent of another corporation or
of a  partnership,  joint  venture,  trust  or  other  enterprise,  against  any
liability  asserted  against  such person or incurred by such person in any such
capacity,  or arising out of such person's status as such, and related expenses,
whether or not the  corporation  would have the power to  indemnify  such person
against such liability under the provisions of the Delaware General  Corporation
Law.

                                       21

<PAGE>



                FOURTEENTH: Any actions required or permitted to be taken by the
stockholders must be effected at a duly called annual or special meeting of such
stockholders  and  may  not be  effected  by any  consent  in  writing  by  such
stockholders.


                           IN  WITNESS  WHEREOF,  the  undersigned,   being  the
Incorporator  hereinabove  named,  for the  purpose  of  forming  a  corporation
pursuant to the Delaware  General  Corporation  Law,  hereby  certifies that the
facts  hereinabove  stated are truly set forth,  and  accordingly  executes this
Certificate of Incorporation this 26th day of June, 1996.




                                             Incorporator


                                             By:
                                                --------------------------------






    

                                       22




                          CERTIFICATE OF INCORPORATION

                                       OF

                           ORION SATELLITE CORPORATION



                  FIRST:   The  name  of  the  Corporation  is  Orion  Satellite
Corporation (hereinafter called the "Corporation").

                  SECOND:  The registered office of the Corporation in the State
of  Delaware is  Corporation  Trust  Center,  1209  Orange  Street,  Wilmington.
Delaware 19801,  County of New Castle. The name of the Corporation's  registered
agent at said address is The Corporation Trust Company.

                  THIRD:  The  purpose  of the  Corporation  is to engage in any
lawful acts or  activities  for which  corporations  may be organized  under the
General Corporation Law of Deleware.

                  FOURTH:  The  total  number  of  shares  of  stock  which  the
Corporation  shall have the authority to issue is One Thousand (1,000) shares of
Common Stock, all of one class, having a par value of $.01 per share.

                  FIFTH:  The name and mailing  address of the  incorporator  is
John G. Puente, 1350 Piccard Drive, Rockville, MD 20850 (the "Incorporator").

                  SIXTH: The powers of the Incorporator shall terminate upon the
filing of this Certificate of Incorporation,  and the following persons,  having
the indicated mailing addresses, shall serve as the directors of the

<PAGE>



Corporation   until  the  first  annual  meeting  of  the  stockholders  of  the
Corporation or until successor or successors are elected and qualify:

      Name                       Mailing Address

John G. Puente              1350 Piccard Drive
                            Rockville, Maryland 20850

Christopher J. Vizas, II    1835 K Street, N.W., Suite 201
                            Washington, DC 20006

C. Elliott Bardsley         1350 Piccard Drive
                            Rockville, Maryland 20850


                  SEVENTH:  The number of directors of the Corporation  shall be
such  number as from time to time shall be fixed by, or in the  manner  provided
in, the  by-laws of the  Corporation.  Unless and except to the extent  that the
by-laws of the Corporation shall otherwise require, the election of directors of
the Corporation need not be by written ballot.

                  EIGHTH:  In  furtherance  and not in  limitation of the powers
conferred  by the laws of the State of  Delaware,  the Board of Directors of the
Corporation  is expressly  authorized  and empowered to adopt,  amend and repeal
by-laws of the Corporation.

                  NINTH: No director of the  Corporation  shall be liable to the
Corporation  or its  stockholders  for monetary  damages for breach of fiduciary
duty as a director,  provided that nothing contained in this Article Ninth shall
eliminate  or limit  the  liability  of a  director  (i) for any  breach  of the
director's duty of loyalty to the Corporation or its stockholders, (ii) for acts
or omissions

<PAGE>



 not in  good  faith  or  which  involve  intentional  misconduct  or a  knowing
violation of law,  (iii) under Section 174 of the Delaware  General  Corporation
Law, or (iv) for any  transaction  from which the  director  derived an improper
personal benefit.
                  TENTH:  The  Corporation  reserves the right at any time,  and
from time to time, to amend,  alter, change or repeal any provision contained in
this Certificate of Incorporation,  and other provisions  authorized by the laws
of the State of Delaware at the time in force may be added or  inserted,  in the
manner now or  hereafter  prescribed  by law;  and all rights,  preferences  and
privileges of whatsoever  nature conferred upon  stockholders,  directors or any
other persons whomsoever by and pursuant to this Certificate of Incorporation in
its present  form or as  hereafter  amended  are  granted  subject to the rights
reserved in this Article Tenth.

                  IN WITNESS WHEREOF,  the  undersigned,  being the Incorporator
hereinabove  named,  for the  purpose of forming a  corporation  pursuant to the
General  Corporation  Law of the State of Delaware,  hereby  certifies  that the
facts  hereinabove  stated are truly set forth,  and accordingly I have hereunto
set my hand this 20th day of January, 1988.


                                            /s/ John G. Puente
                                            ----------------------------
                                                John G. Puente

                                     BY-LAWS

                                       OF

                           ORION SATELLITE CORPORATION


1.  Offices.
                  1.1  Registered   Office.   The   registered   office  of  the
corporation shall be in the City of Wilmington,  County of New Castle,  State of
Delaware,  and the registered  agent in charge thereof shall be The  Corporation
Trust  Company,  Corporation  Trust  Center,  1209  Orange  Street,  Wilmington,
Delaware 19801.
                  1.2 Other Offices.  The  corporation  may also have offices at
such other places,  both within and without the State of Delaware,  as the board
of directors may from time to time determine or the business of the  corporation
may require.

2.  Meetings of Stockholders.
    ------------------------
                  2.1 Place of Meetings.  All meetings of the  stockholders  for
the election of directors shall be held in Washington, D.C. at such place as may
be fixed from time to time by the board of  directors,  or at such other  place,
within or without the State of  Delaware,  as shall be  designated  from time to
time by the board of  directors  and stated in the notice of the meeting or in a
duly executed waiver of notice thereof.  Meetings of stockholders  for any other
purpose  may be held at such  time and  place,  within or  without  the State of
Delaware,  as shall be stated in the notice of the meeting or in a duly executed
waiver of notice thereof.
<PAGE>

                  2.2  Annual   Meetings.   Annual  meetings  of   stockholders,
commencing  with the year 1988,  shall be held on the first  Thursday of May, if
not a legal  holiday,  and if a legal  holiday,  then on the  next  secular  day
following,  at 10:00 a.m., or at such other date and time as shall be designated
from  time to time by the board of  directors  and  stated in the  notice of the
meeting or in a duly executed  waiver of notice thereof,  at which  stockholders
shall  elect a board of  directors  and  transact  such  other  business  as may
properly be brought before the meeting.

                  2.3 Special  Meetings.  Special meetings of the  stockholders,
for any purpose or purposes,  unless  otherwise  prescribed by statute or by the
certificate of incorporation,  may be called by the board of directors or by the
president,  and shall be called by the  president or secretary at the request in
writing of stockholders  owning a majority in amount of the entire capital stock
of the  corporation  issued and  outstanding  and entitled to vote. Such request
shall include a statement of the purpose or purposes of the proposed meeting.

                  2.4 Notice of Meetings.  Written notice of the annual meeting,
stating  the  place,  date  and  hour of the  meeting,  shall  be  given to each
stockholder  entitled  to vote at such  meeting  not less than ten nor more than
sixty days before the date of the meeting.  Written notice of a special  meeting
of stockholders, stating the place, date and hour of the meeting and the purpose
or purposes for which the meeting is called,  shall be given to 

                                     - 2 -
<PAGE>



each  stockholder  entitled  to vote at such  meeting not less than ten nor more
than sixty days before the date of the meeting.

                  2.5 Business at Special Meetings.  Business  transacted at any
special meeting of  stockholders  shall be limited to the purposes stated in the
notice.

                  2.6 List of  Stockholders.  The  officer who has charge of the
stock ledger of the corporation shall prepare and make, at least ten days before
every meeting of stockholders,  a complete list of the stockholders  entitled to
vote at the meeting,  arranged in alphabetical  order and showing the address of
each  stockholder  and the  number  of  shares  registered  in the  name of each
stockholder.  Such list shall be open to the examination of any stockholder, for
any purpose germane to the meeting, during ordinary business hours, for a period
of at least ten days  prior to the  meeting,  either at a place  within the city
where the meeting is to be held, which place shall be specified in the notice of
the meeting,  or, if not so  specified,  at the place where the meeting is to be
held.  The list  shall  also be  produced  and kept at the time and place of the
meeting during the whole time thereof,  and may be inspected by any  stockholder
who is present.  The stock ledger  shall be the only  evidence as to who are the
stockholders  entitled to examine the stock  ledger,  the list  required by this
section or the books of the corporation, or to vote in person or by proxy at any
meeting of stockholders.

                                     - 3 -
<PAGE>

                  2.7  Quorum at  Meetings.  Except  as  otherwise  provided  by
statute or by the certificate of incorporation, the holders of a majority of the
stock issued and outstanding and entitled to vote thereat,  present in person or
represented  by  proxy,  shall  constitute  a  quorum  at  all  meetings  of the
stockholders for the transaction of business. If, however, such quorum shall not
be  present  or  represented  at  any  such  meeting  of the  stockholders,  the
stockholders  entitled  to vote  thereat,  present in person or  represented  by
proxy, shall have power to adjourn the meeting from time to time to another time
and place,  without notice other than  announcement at the meeting of such other
time and place.  At the adjourned  meeting at which a quorum shall be present or
represented,  any business may be transacted which might have been transacted at
the original  meeting.  If the  adjournment  is for more than thirty days, or if
after the  adjournment a new record date is fixed for the adjourned  meeting,  a
notice of the  adjourned  meeting shall be given to each  stockholder  of record
entitled to vote at the meeting.

                  2.8 Voting  and  Proxies.  Unless  otherwise  provided  in the
certificate  of  incorporation,  and subject to the provisions of Section 6.4 of
these by-laws, each stockholder shall be entitled to one vote on each matter, in
person or by proxy,  for each share of the  corporation's  capital  stock having
voting power which is held by such stockholder. No proxy shall be voted or acted
upon after three  years from its date,  unless the proxy  

                                     - 4 -

<PAGE>

provides for a longer  period.  A duly executed proxy shall be irrevocable if it
states that it is irrevocable and if, and only as long as, it is coupled with an
interest  sufficient in law to support an irrevocable power. A proxy may be made
irrevocable  regardless  of whether the interest  with which it is coupled is an
interest in the stock itself or an interest in the corporation generally.

                  2.9 Required Vote.  When a quorum is present at any meeting of
stockholders,  all matters shall be determined, adopted and approved by the vote
(which  need not be by ballot) of a majority  of the votes cast with  respect to
the matter,  unless the proposed action is one upon which, by express  provision
of  statutes  or of the  certificate  of  incorporation,  a  different  vote  is
specified and required,  in which case such express  provision  shall govern and
control the decision of such question. Notwithstanding the foregoing, candidates
for election as members of the board of directors who receive the highest number
of votes, up to the number of directors to be chosen,  shall stand elected,  and
an  absolute  majority  of the votes  cast  shall not be a  prerequisite  to the
election of any candidate to the board of directors.

                  2.10 Action Without a Meeting.  Unless  otherwise  provided in
the certificate of incorporation,  any action required to be taken at any annual
or special meeting of stockholders of the  corporation,  or any action which may
be taken at any annual 

                                     - 5 -
<PAGE>


or special meeting of such stockholders, may be taken without a meeting, without
prior  notice and  without a vote,  if a consent in writing,  setting  forth the
action so taken,  is signed by the holders of outstanding  stock having not less
than the minimum  number of votes that would be  necessary  to authorize or take
such  action at a meeting  at which all shares  entitled  to vote  thereon  were
present and voted. Prompt notice of the taking of the corporate action without a
meeting  by less  than  unanimous  written  consent  shall  be  given  to  those
stockholders who shall not have consented in writing.

3.  Directors.
    ---------
                  3.1 Powers.  The business and affairs of the corporation shall
be  managed  by or under  the  direction  of the board of  directors,  which may
exercise  all such  powers of the  corporation  and do all such  lawful acts and
things as are not by statute or by the certificate of  incorporation or by these
by-laws directed or required to be exercised or done by the stockholders.

                  3.2 Number and Election.  The number of directors  which shall
constitute  the whole  board  shall not be less than one nor more than ten.  The
first  board shall  consist of three  directors.  Thereafter,  within the limits
above  specified,  the number of directors  shall be determined by resolution of
the board of directors.  The directors shall be elected at the annual 

                                     - 6 -
<PAGE>

meeting of the stockholders,  except as provided in Section 3.3 hereof, and each
director  elected shall hold office until his successor is elected and qualified
or until his earlier resignation or removal. Directors need not be stockholders.

                  3.3  Vacancies.  Vacancies  and  newly  created  directorships
resulting from any increase in the authorized  number of directors may be filled
by a majority of the directors then in office,  although less than a quorum,  or
by a sole  remaining  director,  and each  director so chosen  shall hold office
until the next annual election and until his successor is elected and qualified,
or until his  earlier  resignation  or  removal.  If there are no  directors  in
office,  then an election  of  directors  may be held in the manner  provided by
statute.  If,  at  the  time  of  filling  any  vacancy  or  any  newly  created
directorship,  the directors then in office  constitute  less than a majority of
the whole board (as constituted  immediately  prior to any such  increase),  the
Court of  Chancery  of the  State  of  Delaware  may,  upon  application  of any
stockholder or stockholders  holding at least ten percent of the total number of
the then  outstanding  shares  having  the  right  to vote  for such  directors,
summarily  order an  election  to be held to fill any  such  vacancies  or newly
created directorships,  or to replace the directors chosen by the directors then
in  office,  in  accordance  with the  General  Corporation  Law of the State of
Delaware.  In the  event  that one or more  directors  resigns  from the  board,
effective  at a  future  

                                     - 7 -
<PAGE>

date, a majority of the directors  then in office,  including  those who have so
resigned,  shall have power to fill such vacancy or vacancies,  the vote thereon
to take effect when such resignation or resignations shall become effective, and
each  director so chosen  shall hold office  until the next annual  election and
until his successor is elected and qualified,  or until his earlier  resignation
or removal.

                  3.4  Place  of  Meetings.   The  board  of  directors  of  the
corporation  may hold  meetings,  both  regular and  special,  either  within or
without the State of Delaware.

                  3.5 First  Meeting of Each  Board.  The first  meeting of each
newly elected  board of directors  shall be held at such time and place as shall
be specified in a notice given as hereinafter  provided for special  meetings of
the board of directors,  or as shall be specified in a written  waiver of notice
signed by all of the directors.

                  3.6  Regular  Meetings.  Regular  meetings  of  the  board  of
directors  may be held  without  notice at such time and at such  place as shall
from time to time be determined by the board of directors.

                  3.7  Special  Meetings.  Special  meetings of the board may be
called by the president on one day's notice to each director,  either personally
or by telephone, by mail or by telegram; special meetings shall be called by the
president or secretary in like manner and on like notice on the written  request
of one-third of the total number of directors.

                                     - 8 -
<PAGE>

                  3.8 Quorum and Vote at Meetings. At all meetings of the board,
one director if a board of one director is authorized, or such greater number of
directors as is not less than a majority of the total number of directors, shall
constitute a quorum for the  transaction of business.  The vote of a majority of
the directors present at any meeting at which there is a quorum shall be the act
of the board of directors,  except as may be otherwise  specifically provided by
statute or by the certificate of incorporation. If a quorum shall not be present
at any meeting of the board of  directors,  the  directors  present  thereat may
adjourn  the  meeting  to  another  time and place,  without  notice  other than
announcement at the meeting of such other time and place.

                  3.9 Telephone  Meetings.  Members of the board of directors or
any committee designated by the board may participate in a meeting of such board
or  committee  by  means  of  conference  telephone  or  similar  communications
equipment  by means of which all persons  participating  in the meeting can hear
each  other,  and  participation  in a meeting  pursuant to this  section  shall
constitute presence in person at such meeting.

                  3.10 Action Without Meeting.  Unless  otherwise  restricted by
the  certificate  of  incorporation  or these  by-laws,  any action  required or
permitted  to be taken  at any  meeting  of the  board  of  directors  or of any
committee thereof may be taken without a meeting, if all members of the board or
committee,  as 

                                     - 9 -
<PAGE>

the case may be,  consent  thereto in writing,  and the writing or writings  are
filed with the minutes of proceedings of the board of directors or committee.

                  3.11  Committees of  Directors.  The board of directors may by
resolution  passed by a  majority  of the  whole  board,  designate  one or more
committees,  each  committee  to consist of one or more of the  directors of the
corporation.  The board may designate one or more directors as alternate members
of any  committee,  who may  replace  any absent or  disqualified  member at any
meeting of the  committee.  If a member of a committee  shall be absent from any
meeting,  or disqualified  from voting thereat,  the remaining member or members
present and not disqualified from voting,  whether or not such member or members
constitute a quorum, may, by unanimous vote, appoint another member of the board
of directors  to act at the meeting in the place of such absent or  disqualified
member.  Any such  committee,  to the extent  provided in the  resolution of the
board of directors,  shall have and may exercise all the powers and authority of
the board of  directors  in the  management  of the  business and affairs of the
corporation,  and may authorize the seal of the corporation to be affixed to all
papers  which may  require  it;  but no such  committee  shall have the power or
authority in reference to amending the certificate of incorporation (except that
a committee  may, to the extent  authorized  in the  resolution  or  resolutions
providing  for the issuance of shares of stock adopted by the board of directors

                                     - 10 -
<PAGE>

pursuant  to  Section  151(a)  of the  General  Corporation  Law of the State of
Delaware  [hereinafter the "GCL"],  fix any of the preferences or rights of such
shares  relating to dividends,  redemption,  dissolution,  any  distribution  of
assets of the corporation or the conversion into, or the exchange of such shares
for, shares of any other class or classes or any other series of the same or any
other class or classes of stock of the  corporation),  adopting an  agreement of
merger or consolidation pursuant to Sections 251 or 252 of the GCL, recommending
to the stockholders  the sale, lease or exchange of all or substantially  all of
the  corporation's  property  and assets,  recommending  to the  stockholders  a
dissolution of the corporation or a revocation of a dissolution, or amending the
by-laws of the  corporation;  and, unless  otherwise  expressly  provided in the
resolution,  no such  committee  shall have the power or  authority to declare a
dividend,  to authorize  the  issuance of stock,  or to adopt a  certificate  of
ownership  and merger  pursuant to Section  253 of the GCL.  Such  committee  or
committees  shall have such name or names as may be determined from time to time
by resolution adopted by the board of directors.  Unless otherwise  specified in
the  resolution  of the board of directors  designating  the  committee,  at all
meetings of each such committee of directors,  a majority of the total number of
members  of the  committee  shall  constitute  a quorum for the  transaction  of
business,  and the vote of a majority of the members of the committee present at
any 

                                     - 11 -
<PAGE>

meeting  at  which  there is a quorum  shall be the act of the  committee.  Each
committee  shall keep regular minutes of its meetings and report the same to the
board of directors, when required.

                  3.12 Compensation of Directors. Unless otherwise restricted by
the  certificate  of  incorporation,  the  board  of  directors  shall  have the
authority to fix the compensation of directors.  The directors may be paid their
expenses,  if any, of  attendance  at each meeting of the board of directors and
may be paid a fixed sum for attendance at each meeting of the board of directors
or a stated salary as director. No such payment shall preclude any director from
serving  the  corporation  in any  other  capacity  and  receiving  compensation
therefor.   Members  of  special  or  standing   committees  may  be  paid  like
compensation for attending committee meetings.

4.  Notices of Meetings.
    -------------------
                  4.1 Notice Procedure.  Whenever,  whether under the provisions
of any  statute or of the  certificate  of  incorporation  or of these  by-laws,
notice is required to be given to any director or stockholder,  such requirement
shall not be construed to require the giving of personal notice. Such notice may
be given in writing, by mail, addressed to such director or stockholder,  at his
address as it appears on the records of the  corporation,  with postage  thereon
prepaid,  and such notice  shall 

                                     - 12 -
<PAGE>

be  deemed  to be given at the time  when the same is  deposited  in the  United
States  mail.  Notice  to  directors  may also be given by  telex,  telegram  or
telephone.

                  4.2  Waivers of Notice.  Whenever  the giving of any notice is
required by statute, the certificate of incorporation or these by-laws, a waiver
thereof,  in writing,  signed by the person or persons  entitled to said notice,
whether before or after the event as to which such notice is required,  shall be
deemed  equivalent  to  notice.  Attendance  of  a  person  at a  meeting  shall
constitute a waiver of notice of such meeting,  except when the person attends a
meeting for the express  purpose of objecting,  at the beginning of the meeting,
to the transaction of any business because the meeting is not lawfully called or
convened.  Neither  the  business to be  transacted  at, nor the purpose of, any
regular  or  special  meeting  of the  stockholders,  directors  or members of a
committee of directors need be specified in any written waiver of notice, unless
so required by the certificate of incorporation, by statute or by these by-laws.

5.  Officers.
    --------
                  5.1  Positions.  The  officers of the  corporation  shall be a
chairman,  a president and a secretary,  and such other officers as the board of
directors may appoint, including a vice chairman, one or more vice presidents, a
treasurer,  assistant secretaries and assistant  treasurers,  who shall exercise
such 

                                     - 13 -
<PAGE>

powers and perform such duties as shall be  determined  from time to time by the
board.  Any  number  of  offices  may be held by the  same  person,  unless  the
certificate  of  incorporation  or these by-laws  otherwise  provide;  provided,
however,  that in no event  shall the  chairman  and the  secretary  be the same
person.

                  5.2  Appointment.  The  officers of the  corporation  shall be
chosen by the board of directors at its first meeting after each annual  meeting
of stockholders.

                  5.3  Compensation.  The  compensation  of all  officers of the
corporation shall be fixed by the board of directors.

                  5.4 Term of Office. The officers of the corporation shall hold
office  until their  successors  are chosen and  qualify or until their  earlier
resignation  or removal.  Any officer may resign at any time upon written notice
to the  corporation.  Any officer elected or appointed by the board of directors
may be removed at any time, with or without cause, by the affirmative  vote of a
majority of the board of directors.  Any vacancy  occurring in any office of the
corporation shall be filled by the board of directors.

                  5.5 Fidelity Bonds. The corporation may secure the fidelity of
any or all of its officers or agents by bond or otherwise.

                  5.6 Chairman. The chairman shall (when present) preside at all
meetings of the Board of Directors and  stockholders,  and shall ensure that all
orders and  resolutions of the Board of Directors and  stockholders  are carried

                                     - 14 -
<PAGE>

into effect.  In addition,  the chairman  shall exercise such powers and perform
such  other  duties  as from  time to time  may be  specified  by the  Board  of
Directors. The chairman shall have the authority to execute bonds, mortgages and
other contracts under the seal of the corporation,  except where required by law
to be otherwise  signed and executed and except where the signing and  execution
thereof  shall be  expressly  delegated  by the board of directors to some other
officer or agent of the corporation.

                  5.7  President.  The  president  shall be the chief  executive
officer of the Corporation,  and shall have overall responsibility and authority
for management of the business of the  corporation,  subject to the authority of
the Board of  Directors.  In the absence of the  chairman or in the event of the
chairman's  inability or failure to act, the president  shall perform the duties
of the chairman  (except to the extent that any vice  chairman is  authorized to
perform  such  duties),  and when so acting shall have all the powers of, and be
subject to all the restrictions upon, the chairman. The president shall have the
authority to execute bonds,  mortgages and other contracts under the seal of the
corporation,  except where  required by law to be otherwise  signed and executed
and except where the signing and execution thereof shall be 

                                     - 15 -
<PAGE>

expressly  delegated by the board of directors to some other officer or agent of
the corporation.

                  5.8 Vice Chairman or Vice  Presidents.  If the directors shall
appoint a vice  chairman or one or more vice  presidents,  such vice chairman or
vice presidents  shall perform such duties and have such powers as may be vested
in such vice  chairman or vice  presidents  by the board of  directors or by the
president.  One of such vice  presidents may be designated  the chief  operating
officer  of the  corporation  and  have  general  management  of the  day-to-day
operations of the corporation, subject to the authority of the president.

                  5.9 Secretary.  The secretary shall attend all meetings of the
board of directors  and all meetings of the  stockholders,  and shall record all
the  proceedings  of the  meetings  of the  stockholders  and  of the  board  of
directors in a book to be kept for that  purpose,  and shall perform like duties
for the standing committees,  when required.  The secretary shall give, or cause
to be given,  notice of all meetings of the stockholders and special meetings of
the board of directors, and shall perform such other duties as may be prescribed
by the board of  directors  or by the  president,  under whose  supervision  the
secretary  shall be. The secretary  shall have custody of the corporate  seal of
the  corporation,  and the  secretary,  or an  assistant  secretary,  shall have
authority to affix the same to any instrument  requiring it, and when so affixed
it may be attested by the signature of the 

                                     - 16 -
<PAGE>

secretary  or by the  signature  of  such  assistant  secretary.  The  board  of
directors  may give general  authority to any other officer to affix the seal of
the  corporation  and to attest the affixing by such  officer's  signature.  The
secretary or an assistant  secretary may also attest all  instruments  signed by
the chairman, the president or any vice president.

                  5.10 Assistant Secretary. The assistant secretary, or if there
be more than one, the assistant secretaries in the order determined by the board
of  directors  (or if there shall have been no such  determination,  then in the
order of their election), shall, in the absence of the secretary or in the event
of the secretary's  inability or refusal to act, perform the duties and exercise
the powers of the  secretary,  and shall perform such other duties and have such
other powers as the board of directors may from time to time prescribe.

                  5.11     Treasurer.
                           ----------

                           5.11.1 Duties.  The treasurer  shall have the custody
of the corporate funds and securities and shall keep full and accurate  accounts
of receipts and  disbursements in books belonging to the corporation,  and shall
deposit all moneys and other  valuable  effects in the name and to the credit of
the  corporation  in such  depositories  as may be  designated  by the  board of
directors.  The treasurer shall disburse the funds of the corporation as ordered
by the board of directors,  taking 

                                     - 17 -
<PAGE>

proper vouchers for such disbursements,  and shall render to the president,  and
to the  board  of  directors  at its  regular  meetings,  or when  the  board of
directors so requires,  an account of all  transactions  as treasurer and of the
financial condition of the corporation.

                  5.11.2  Bond.  If  required  by the  board of  directors,  the
treasurer  shall give the corporation a bond in such sum and with such surety or
sureties as shall be  satisfactory  to the board of  directors  for the faithful
performance of the duties of the  treasurer's  office and for the restoration to
the corporation,  in case of the treasurer's death,  resignation,  retirement or
removal from office, of all books, papers, vouchers, money and other property of
whatever kind, in the treasurer's  possession or under the  treasurer's  control
and belonging to the corporation.

                  5.12 Assistant Treasurer. The assistant treasurer, or if there
shall be more than one, the assistant  treasurers in the order determined by the
board of directors (or if there shall have been no such  determination,  then in
the order of their  election),  shall, in the absence of the treasurer or in the
event of the  treasurer's  inability  or refusal to act,  perform the duties and
exercise the powers of the  treasurer,  and shall  perform such other duties and
have  such  other  powers  as the  board  of  directors  may  from  time to time
prescribe.

                                     - 18 -
<PAGE>

6.  Capital Stock.
    -------------
                  6.1 Certificates of Stock;  Uncertificated  Shares. The shares
of the corporation shall be represented by certificates, provided that the board
of directors may provide by resolution or resolutions that some or all of any or
all classes or series of the corporation's stock shall be uncertificated shares.
Any such resolution shall not apply to shares represented by a certificate until
such certificate is surrendered to the corporation. Notwithstanding the adoption
of  such a  resolution  by  the  board  of  directors,  every  holder  of  stock
represented  by  certificates  and upon request  every holder of  uncertificated
shares shall be entitled to have a certificate  signed by, or in the name of the
corporation  by the chairman or vice chairman of the board of directors,  or the
president or vice president, and by the treasurer and/or assistant treasurer, or
the secretary or an assistant  secretary of such  corporation  representing  the
number of shares  registered in  certificate  form. Any or all the signatures on
the  certificate  may be  facsimile.  In case  any  officer,  transfer  agent or
registrar whose signature or facsimile  signature appears on a certificate shall
have  ceased  to be such  officer,  transfer  agent  or  registrar  before  such
certificate is issued,  it may be issued by the corporation with the same effect
as if such person were such officer,  transfer agent or registrar at the date of
issue.

                                     - 19 -
<PAGE>

                  6.2 Lost Certificates. The board of directors may direct a new
certificate or  certificates of stock or  uncertificated  shares to be issued in
place of any certificate or certificates  theretofore  issued by the corporation
and  alleged  to have been  lost,  stolen or  destroyed,  upon the  making of an
affidavit of that fact by the person  claiming that the certificate of stock has
been  lost,  stolen  or  destroyed.  When  authorizing  such  issuance  of a new
certificate or  certificates,  the board of directors may, in its discretion and
as a condition  precedent  to the  issuance  thereof,  require the owner of such
lost,  stolen or destroyed  certificate or  certificates,  or such owner's legal
representative,  to advertise the same in such manner as the board shall require
and/or to give the  corporation a bond, in such sum as the board may direct,  as
indemnity  against any claim that may be made against the corporation on account
of the certificate  alleged to have been lost, stolen or destroyed or on account
of the issuance of such new certificate or uncertificated shares.

                  6.3  Transfers.  The transfer of stock and  certificates  that
represent the stock and the transfer of uncertificated  shares shall be effected
in accordance  with the laws of the State of Delaware.  Any  restriction  on the
transfer of a security imposed by the corporation  shall be noted  conspicuously
on the security.

                                     - 20 -
<PAGE>

                  6.4 Fixing  Record  Date.  In order that the  corporation  may
determine the stockholders  entitled to notice of, or to vote at, any meeting of
stockholders  or any  adjournment  thereof,  or to express  consent to corporate
action in  writing  without a meeting,  or  entitled  to receive  payment of any
dividend  or other  distribution  or  allotment  of any  rights,  or entitled to
exercise any rights in respect of any change, conversion or exchange of stock or
for the purpose of any other lawful  action,  the board of directors may fix, in
advance,  a record  date,  which  shall not be more than sixty nor less than ten
days  before  the date of such  meeting,  nor more than  sixty days prior to any
other action.  A determination  of stockholders of record entitled to notice of,
or to vote at, a meeting of  stockholders  shall apply to any adjournment of the
meeting;  provided,  however,  that the board of directors  may fix a new record
date for the adjourned meeting.

                  6.5 Registered Stockholders. The corporation shall be entitled
to recognize  the  exclusive  right of a person  registered  on its books as the
owner of shares to receive dividends, to receive notifications,  to vote as such
owner,  and to  exercise  all  the  rights  and  powers  of an  owner;  and  the
corporation  shall not be bound to recognize  any equitable or other claim to or
interest in such share or shares on the part of any other person, whether or not
it shall have express or other notice thereof,  except as otherwise  provided by
the laws of the State of Delaware.

                                     - 21 -
<PAGE>

7.  Indemnification.
    ---------------
                  Unless  expressly  prohibited  by law, the  corporation  shall
fully indemnify any person made, or threatened to be made, a party to an action,
suit or proceeding (whether civil, criminal, administrative or investigative) by
reason of the fact that such person, or such person's testator or intestate,  is
or was a director or officer,  employee or agent of the corporation or serves or
served any other  enterprise  at the  request of the  corporation,  against  all
expenses (including attorneys' fees), judgments, fines and amounts paid or to be
paid in settlement incurred in connection with such action, suit or proceeding.

8.  General Provisions.
    ------------------
                  8.1  Dividends.  Dividends  upon  the  capital  stock  of  the
corporation,  subject to the provisions of the certificate of incorporation  and
the laws of the State of Delaware,  may be declared by the board of directors at
any  regular  or  special  meeting.  Subject to the  provisions  of the  General
Corporation Law of the State of Delaware,  such dividends may be paid either out
of surplus,  as defined in the General Corporation Law of the State of Delaware,
or in the event that there shall be no such surplus,  out of the net profits for
the fiscal year in which the dividend is declared  and/or the  preceding  fiscal
year.  Dividends  may  be  paid  in  cash,  in  property,  or in  shares  of the
corporation's  capital  stock,  subject  to  the  provisions,  if  any,  of  the
certificate of incorporation.

                                     - 22 -
<PAGE>

                  8.2 Reserves.  The directors of the corporation may set apart,
out of the funds of the  corporation  available  for  dividends,  a  reserve  or
reserves for any proper purpose and may abolish any such reserve.

                  8.3 Execution of Instruments.  All checks or demands for money
and notes of the corporation shall be signed by such officer or officers or such
other  person  or  persons  as the  board of  directors  may  from  time to time
designate.

                  8.4 Fiscal Year. The fiscal year of the  corporation  shall be
fixed by resolution of the board of directors.

                  8.5 Seal. The corporate seal shall have inscribed  thereon the
name of the  corporation,  the year of its organization and the words "Corporate
Seal, Delaware". The seal may be used by causing it or a facsimile thereof to be
impressed or affixed or otherwise reproduced.

9.  Amendments.
    ----------
                  These  by-laws  may be altered,  amended or  repealed  and new
by-laws may be adopted by the board of directors.


                       *          *          *          *

                                     - 23 -
<PAGE>


                  The  foregoing  by-laws were adopted by the board of directors
on January 15, 1988.

                  The  foregoing  by-laws were amended by the board of directors
on December 20, 1991 to replace Article 5.




                 INTERNATIONAL PRIVATE SATELLITE PARTNERS, L.P.

                       CERTIFICATE OF LIMITED PARTNERSHIP

                  The  undersigned,  being  the  sole  general  partner  of  the
above-named limited partnership (the "Partnership"),  for the purpose of forming
a limited partnership pursuant to Section 17-201 of the Delaware Revised Uniform
Limited Partnership Act, as amended, hereby certifies that:

                  1. The name of the Partnership shall be International  Private
Satellite Partners, L.P.

                  2. The  address of the  registered  office of the  Partnership
shall be 1013 Centre Road, Wilmington,  Delaware 19805, and the name and address
of the registered  agent of the  Partnership for service of process shall be the
Corporation Service Company, 1013 Centre Road, Wilmington, Delaware 19805.

                  3. The name and business  address of the sole general  partner
of the Partnership are: Orion Satellite  Corporation,  1350 Piccard Drive, Suite
400, Rockville, Maryland 20850.

                                          GENERAL PARTNER:
                                          Orion Satellite Corporation


Dated: August 15, 1989                    By:  /s/


<PAGE>



                 INTERNATIONAL PRIVATE SATELLITE PARTNERS, L.P.

                            CERTIFICATE OF AMENDMENT
                                       OF
                       CERTIFICATE OF LIMITED PARTNERSHIP

                  The  undersigned,  being  the  sole  general  partner  of  the
above-named limited partnership (the "Partnership"), for the purpose of amending
its  Certificate  of  Limited  Partnership  pursuant  to  Section  17-202 of the
Delaware Revised Uniform Limited  Partnership Act, as amended,  hereby certifies
that:

                  1.  The  name  of the  Partnership  is  International  Private
Satellite Partners, L.P.

                  2. The  Certificate of Limited  Partnership of the Partnership
is hereby amended to change the business  address of the sole general partner of
the Partnership to: Orion Satellite Corporation,  2440 Research Boulevard, Suite
400, Rockville, Maryland 20850.


                                                GENERAL PARTNER:
                                                Orion Satellite Corporation

Dated:  March 1, 1993                           By: /s/ John. G. Puente
                                                    -------------------
                                                Name:  John G. Puente
                                                       --------------
                                                Title:  Chairman & CEO
                                                            

  









                           THIRD AMENDED AND RESTATED

                                    AGREEMENT

                                       OF

                               LIMITED PARTNERSHIP

                                       OF

                 INTERNATIONAL PRIVATE SATELLITE PARTNERS, L.P.



<PAGE>

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----
ARTICLE I  CERTAIN DEFINITIONS.................................................2
ARTICLE II  PARTNERSHIP CONTINUATION, NAME, PLACE OF
      BUSINESS........................................9
      2.01.  Continuation of Partnership; Certificate of Limited 
             Partnership; Determination of Partnership Rights and
             Duties............................................................9
      2.02.  Name of Partnership...............................................9
      2.03.  Place of Business................................................10
      2.04.  Registered Office and Registered Agent...........................10
ARTICLE III  PURPOSES AND POWERS OF PARTNERSHIP...............................10
      3.01.  Purposes.........................................................10
      3.02.  Powers...........................................................10
      3.03.  Limitation on Powers of the Partnership..........................12
ARTICLE IV   TERM OF PARTNERSHIP..............................................12
      4.01.  Term.............................................................12
ARTICLE V    CAPITAL..........................................................12
      5.01.  Capital Contribution of General Partner..........................12
      5.02.  [Intentionally omitted.].........................................12
      5.03.  Capital Contributions of Limited Partners........................12
      5.04.  Capital Accounts.................................................13
      5.05.  Negative Capital Accounts........................................15
      5.06.  No Interest on Amounts in Capital Account........................16
      5.07.  Advances to Partnership..........................................16
      5.08.  Liability of Limited Partners....................................16
      5.09.  Return of Capital................................................16
ARTICLE VI  ALLOCATION OF PROFITS AND LOSSES; 
      DISTRIBUTIONS  OF CASH FLOW AND CERTAIN PROCEEDS........................17
      6.01.  Certain Definitions..............................................17
      6.02.  Allocation of Net Income or Net Loss.............................18
      6.03.  Allocation of Income and Loss With Respect to Partnership 
             Interests Transferred............................................20
      6.04.  Distribution of Cash Flow........................................20
      6.05.  Distribution of Proceeds from Terminating Capital
             Transactions.....................................................21
      6.06.  Special Allocation Rules.........................................22
      6.07.  Contributed Property; Revaluations Pursuant to Section 
             704(b) Regulations...............................................26
      6.08.  Taxes............................................................26
ARTICLE VII  MANAGEMENT.......................................................28
      7.01.  Management and Control of Partnership Business...................28
      7.02.  Powers of General Partner........................................29
      7.03.  Power of Attorney................................................30

                                      -i-
<PAGE>

      7.04.  Limitation on Authority of General Partner.......................32
      7.05.  Working Capital Reserve..........................................33
      7.06.  Other Activities of Partners.....................................33
      7.07.  Transactions with General Partner or Affiliates..................34
      7.08.  Liability of General Partner and Affiliates to Partnership 
             and Limited Partners.............................................34
      7.09.  Indemnification of General Partner and Limited Partners..........35
      7.10.  No Management by Limited Partners................................36
      7.11.  Partners Planning and Policy Review Committee....................37
      7.12.  Meetings of Limited Partners.....................................40
      7.13.  Transfer of Limited Partnership Interest to the General
             Partner..........................................................41
      7.14.  Technical Committee..............................................41
ARTICLE VIII  COMPENSATION OF GENERAL PARTNER; 
      PAYMENT OF PARTNERSHIP EXPENSES.........................................43
      8.01.  Compensation of General Partner..................................43
      8.02.  Partnership Expenses.............................................43
      8.03.  Acquisition, Organizational, and Offering Expenses...............43
ARTICLE IX  BANK ACCOUNTS; BOOKS AND RECORDS; 
      STATEMENTS; TAXES; FISCAL YEAR; ANNUAL BUDGET...........................43
      9.01.  Bank Accounts and Investments....................................43
      9.02.  Books and Records................................................44
      9.03.  Financial Statements and Information.............................44
      9.04.  Accounting Decisions.............................................46
      9.05.  Where Maintained.................................................46
      9.06.  Tax Returns and Tax Matters......................................46
      9.07.  Federal Income Tax Elections.....................................47
      9.08.  Fiscal Year......................................................47
      9.09.  Annual Budget....................................................47
ARTICLE X  TRANSFER OF INTERESTS..............................................49
      10.01.  Transfer........................................................49
      10.02.  Transfer of Interest of General Partner.........................50
      10.03.  Transfer of Interest of Limited Partner.........................50
      10.04.  Partners' Rights of First Refusal...............................51
      10.05.  Restriction on Certain Transfers................................53
ARTICLE XI  OFFERING OF ADDITIONAL PARTNERSHIP  
      INTERESTS; ADMISSION OF ADDITIONAL PARTNERS;
      WITHDRAWAL OF PARTNERS; REMOVAL OF GENERAL
      PARTNER.................................................................53
      11.01.  Offering of Additional Partnership Interests....................53
      11.02.  Admission of Additional Limited Partners........................55
      11.03.  Admission of Successor General Partner..........................55
      11.04.  Withdrawal of General Partner...................................56
      11.05.  Withdrawal of Limited Partner...................................56
      11.06.  Removal of General Partner......................................56

                                      -ii-

<PAGE>

ARTICLE XII  DISSOLUTION AND LIQUIDATION......................................58
      12.01.  Events Causing Dissolution......................................58
      12.02.  Right to Continue Business of Partnership.......................60
      12.03.  Liquidation.....................................................60
      12.04.  Termination of Partnership......................................60
ARTICLE XIII  MISCELLANEOUS PROVISIONS........................................61
      13.01.  Additional Actions and Documents................................61
      13.02.  Notices.........................................................61
      13.03.  Severability....................................................62
      13.04.  Survival........................................................62
      13.05.  Waivers.........................................................62
      13.06.  Exercise of Rights..............................................63
      13.07.  Binding Effect..................................................63
      13.08.  Limitation on Benefits of this Agreement........................63
      13.09.  Amendment Procedure.............................................63
      13.10.  Waiver of Partition.............................................65
      13.11.  Consolidation...................................................65
      13.12.  Entire Agreement................................................65
      13.13.  Pronouns........................................................65
      13.14.  Headings........................................................65
      13.15.  Governing Law...................................................65
      13.16.  Execution in Counterparts.......................................66
      13.17.  Interest Rates..................................................66
ARTICLE XIV  STET REDEMPTION..................................................66
      14.01.  Ratification of STET Redemption, Issuance of New Interest 
              to ONS..........................................................66
      14.02.  STET's Unrecovered Contingent Contributions.....................67
      14.03.  Termination and Modification of STET Agreements.................67
      14.04.  BA Waiver.......................................................68
ARTICLE XV  PARTNERSHIP APPROVALS.............................................69
ARTICLE XVI EXECUTION.........................................................70

                                      iii

<PAGE>





                           THIRD AMENDED AND RESTATED

                        AGREEMENT OF LIMITED PARTNERSHIP

                                       OF

                 INTERNATIONAL PRIVATE SATELLITE PARTNERS, L.P.

                  THIS  THIRD   AMENDED  AND   RESTATED   AGREEMENT  OF  LIMITED
PARTNERSHIP  is  entered  into as of  _______________,  1996 by and among  Orion
Satellite  Corporation,  a Delaware  corporation,  as the General  Partner,  the
persons  named as  Limited  Partners  on  Schedule  A and any other  persons  or
entities  who  shall  in the  future  execute  and  deliver  this  Agreement  as
additional  or  substitute  Partners  pursuant  to the  provisions  hereof.  The
principal  place of business of the General Partner and each Limited Partner are
set forth on Schedule A.

                  WHEREAS,  the General  Partner and the Orion Network  Systems,
Inc.,  a  Delaware  corporation,  as the  organizational  limited  partner  (the
"Organizational  Limited  Partner"),  in  accordance  with the Delaware  Revised
Uniform Limited  Partnership  Act, formed a limited  partnership  under the name
"International Private Satellite Partners, L.P." (the "Partnership") pursuant to
an initial agreement of limited partnership (the "Initial Agreement"),  dated as
of August 15, 1989 and a Certificate of Limited  Partnership  dated as of August
15,  1989 and filed with the office of the  Secretary  of State of  Delaware  on
August 17, 1989; and

                  WHEREAS,  counterparts of an Amended and Restated Agreement of
Limited   Partnership   and   first,   second  and  third   amendments   thereto
(collectively,  the "First  Amended and Restated  Agreement")  were executed and
deposited  into escrow by the  General  Partner  and  certain  proposed  limited
partners of the Partnership; and

                  WHEREAS,  pursuant to a Second Amended and Restated  Agreement
of Limited Partnership entered into as of December 20, 1991 (the "Second Amended
and Restated  Agreement")  the parties  thereto amended and restated the Initial
Agreement and the First Amended and Restated Agreement as provided therein,  the
Organizational  Limited Partner withdrew from the  Partnership,  and the General
Partner and the limited  partners of the  Partnership  continued the Partnership
for the purposes set forth therein, subject to the terms and conditions thereof;

                  WHEREAS,  the General Partner and the limited  partners of the
Partnership  entered into the First Amendment to the Second Amended and Restated
Agreement of Limited  Partnership of International  

<PAGE>


Private Satellite Partners,  L.P., effective as of December 20, 1991, the Second
Amendment to the Second Amended and Restated Agreement of Limited Partnership of
International  Private Satellite  Partners,  L.P. dated April 2, 1992, the Third
Amendment to the Second Amended and Restated Agreement of Limited Partnership of
International  Private Satellite Partners,  L.P. dated April 2, 1992, the Fourth
Amendment to the Second Amended and Restated Agreement of Limited Partnership of
International  Private Satellite Partners,  L.P. dated March 22, 1994, the Fifth
Amendment to the Second Amended and Restated Agreement of Limited Partnership of
International Private Satellite Partners,  L.P., dated May 2, 1994 and the Sixth
Amendment to the Second Amended and Restated Agreement of Limited Partnership of
International Private Satellite Partners, L.P., dated November ____, 1995; and

                  WHEREAS,  the parties  hereto  desire to amend and restate the
Second Amended and Restated  Agreement,  as amended by the six amendments listed
in the prior paragraph,  and the General Partner and the Limited Partners desire
to continue the Partnership for the purposes  hereinafter set forth,  subject to
the terms and conditions hereof.

                  NOW, THEREFORE, in consideration of the foregoing,  and of the
covenants and agreements  hereinafter set forth, the parties hereto hereby agree
as follows:


                                    ARTICLE I

                               CERTAIN DEFINITIONS

                  Unless the context otherwise specifies or requires,  the terms
defined in this Article I shall,  for the purposes of this  Agreement,  have the
meanings herein specified.  Unless otherwise specified, all references herein to
Articles,  Sections,  or Schedules  are to Articles or Sections of, or Schedules
attached to, this Agreement.

                  Adjusted  Basis:  The basis for  determining  gain or loss for
federal income tax purposes from the sale or other  disposition of property,  as
defined in section 1011 of the Code.

                  Affiliate:  With respect to a specified Person,  (a) any other
Person directly or indirectly owning,  controlling, or holding power to vote ten
percent (10%) or more of the voting securities, on a fully diluted basis of such
specified  Person;  (b) any other Person ten percent (10%) or more of the voting
securities,  on a fully diluted basis of which are directly or indirectly owned,
controlled,  or held with power to vote by such specified Person;  (c) any other
Person  directly  or  indirectly  controlling,  controlled  by, or under  common
control  with  such  specified  Person;  (d)  if  such  specified  Person  is  a
corporation,  any executive  officer or director of such specified  Person or of
any corporation  directly or indirectly  controlling such specified Person;  and
(e) if such  specified  Person is a partnership,  any general  partner owning or
controlling  ten percent  (10%) or more,  on a fully diluted basis of either the
capital or profits interest in such  partnership.  As used in this definition of
"Affiliate," the term "control" means the possession, directly or indirectly, of
the 

                                      -2-


<PAGE>

power to direct or cause the  direction  of the  management  and  policies  of a
Person,  whether  through the ownership of voting  securities,  by contract,  or
otherwise.  As used herein, this definition of "Affiliate" excludes an Affiliate
of an Affiliate,  unless such Person would  otherwise be an Affiliate under this
definition.

                  Agreement:  This  Third  Amended  and  Restated  Agreement  of
Limited  Partnership,  as it may be further amended or supplemented from time to
time.

                  Book Tax Gain and Book Tax Loss: The amount of taxable gain or
loss for  federal  income tax  purposes  that would  result from a sale or other
disposition of a Partnership  Asset if, at the time of such sale or disposition,
the Adjusted Basis of the Partnership  Asset sold or otherwise  disposed of were
equal to the Carrying Value of such Partnership Asset at such time.

                  Business Day: Monday through Friday of each week,  except that
a legal holiday recognized as such by the Government of the United States or the
State of Maryland shall not be regarded as a Business Day.

                  Capacity  Option  Agreement:  Each of the  Option  Agreements,
including any amendments thereto, entered into effective as of December 20, 1991
between  the  Partnership  and  each  Limited  Partner  or  its  Affiliate,  any
substantially  similar  agreement  entered into by the Partnership and a Limited
Partner or its Affiliate after December 20, 1991 and any  substantially  similar
agreement  which may be entered into by the Partnership and a Limited Partner or
its Affiliate after the date of this Agreement.

                  Capital   Account:   The  capital   account   established  and
maintained for each Partner pursuant to Section 5.04.

                  Capital  Contribution:  Any property (including cash), whether
tangible or  intangible,  contributed  to the  Partnership  by or on behalf of a
Partner.

                  Carrying Value:  (a) With respect to any asset  contributed to
the  Partnership  or revalued  on the  Partnership's  books  pursuant to Section
5.04(d),  the fair market value of such asset (as determined by the Partners) at
the time of  contribution or  revaluation,  reduced,  but not below zero, by all
deductions for  Depreciation (as defined in the definition of Net Income and Net
Loss)  debited to the  Capital  Accounts  of the  Partners  pursuant  to Section
5.04(a) with respect to such asset from the later of the time of contribution or
the most recent  revaluation to the time the Carrying Value is to be determined;
and (b) with respect to any other asset of the  Partnership,  the Adjusted Basis
of such asset as of the time the Carrying Value is to be determined.

                  Cash Flow:  As defined in Section 6.01(a).

                                      -3-

<PAGE>

                  Certificate:  The Certificate of Limited Partnership,  and any
and all  amendments  thereto,  filed  on  behalf  of the  Partnership  with  the
Recording Office as required under the Delaware RULPA.

                  Code:  The  Internal  Revenue  Code of 1986,  as in effect and
hereafter  amended,  and,  unless the  context  otherwise  requires,  applicable
regulations  thereunder.  Any reference herein to a specific section or sections
of the Code  shall  be  deemed  to  include  a  reference  to any  corresponding
provision of future law.

                  Communications  Satellite  Capacity  Agreement:  Each  of  the
Communications Satellite Capacity Agreements,  including any amendments thereto,
effective  as of December  20, 1991  between the  Partnership  and each  Limited
Partner or its Affiliate,  any  substantially  similar agreement entered into by
the  Partnership  and a Limited Partner or its Affiliate after December 20, 1991
and  any  substantially  similar  agreement  which  may be  entered  into by the
Partnership  and a  Limited  Partner  or its  Affiliate  after  the date of this
Agreement.

                  Contingent  Communications Satellite Capacity Agreement:  Each
of the Contingent  Communications  Satellite Capacity Agreements,  including any
amendments  thereto,  effective as of December 20, 1991 between the  Partnership
and each Limited Partner or its Affiliate,  any substantially  similar agreement
entered into by the  Partnership  and a Limited  Partner or its Affiliate  after
December 20, 1991 and any  substantially  similar agreement which may be entered
into by the Partnership and a Limited Partner or its Affiliate after the date of
this Agreement.

                  Delaware   RULPA:   The  Delaware   Revised   Uniform  Limited
Partnership  Act (Del.  Code Ann. tit. 6 ss. 17-101 et seq.), as amended to date
and as it may be amended from time to time hereafter,  and any successor to such
Act.

                  Excess Negative Balance:  The negative  balance,  if any, in a
Partner's  Capital  Account as of the end of a Fiscal Year after  crediting  the
Partner's  Capital Account for the amount of any deficit balance in such Capital
Account  that the  Partner  is  obligated  to  restore  or is  treated  as being
obligated to restore pursuant to Regulations sections  1.704-1(b)(2)(ii)  (b)(3)
and  1.704-1(b)(2)(ii)(c),  including the amount of such Partner's  share of the
Partnership's   Minimum  Gain,   determined  pursuant  to  Regulations  sections
1.704-1T(b)(4)(iv)(f) and  1.704-1T(b)(4)(iv)(h)(5);  and debiting the Partner's
Capital Account for any  adjustment,  allocation,  or distribution  described in
paragraph (4), (5), or (6) of Regulations section 1.704-1(b)(2)(ii)(d).

                  FCC: The United States  Federal  Communications  Commission or
any successor thereto.

                  FCC License: The FCC license to construct,  launch and operate
two in-orbit  satellites at  37.5(degree)  West  Longitude and  47(degree)  West
Longitude and all rights granted under that license.

                                      -4-
<PAGE>

                  Fiscal Year: The fiscal year of the  Partnership for financial
accounting  purposes,  and for federal,  state,  and local income tax  purposes,
which  shall be the  calendar  year  unless  changed by the  General  Partner in
accordance with Section 9.08.

                  General  Partner:  Orion Satellite  Corporation,  or any other
Person  admitted to the Partnership as a general partner in accordance with this
Agreement.

                  Independent   Party:   A  panel  of  three   individuals,   as
constituted or reconstituted from time to time, each of which persons shall be a
fit and impartial person (where  "impartial" means that such person, at the time
of such person's appointment to the panel, is not and has never been an officer,
director,  partner, employee, or Affiliate of the General Partner or any Limited
Partner),  of which one of such persons shall be chosen by the General  Partner,
one of such  persons  shall be chosen by the  Limited  Partners  pursuant to the
approval of an LP Majority, and one of such persons shall be chosen by the other
two so chosen.

                  Limited  Partner:  Any  Person  named as a Limited  Partner on
Schedule  A, as it may be amended  from time to time,  and any other  persons or
entities  who  shall  in the  future  execute  and  deliver  this  Agreement  as
additional or substitute Partners pursuant to the provisions hereof.

                  LP Majority:  Limited Partners holding a majority of the total
Percentage Interests then held by all Limited Partners.

                  Minimum Gain: The amount determined by computing, with respect
to each  Nonrecourse  Debt of the  Partnership,  the amount of Book Tax Gain (of
whatever  character),  if any, that the Partnership would realize if it disposed
of (in a taxable transaction) the Partnership Assets subject to such Nonrecourse
Debt in full satisfaction  thereof and for no other  consideration,  and by then
aggregating  the amounts so computed.  For  purposes of computing  the amount of
Minimum Gain,  (i) the Carrying  Value of a Partnership  Asset subject to two or
more  Nonrecourse  Debts  of  equal  priority  shall  be  allocated  among  such
Nonrecourse  Debts in proportion to the outstanding  principal  balances of such
Nonrecourse Debts; (ii) the Carrying Value of a Partnership Asset subject to two
or more  Nonrecourse  Debts  of  unequal  priority  shall  be  allocated  to the
Nonrecourse  Debts of an inferior priority (in accordance with clause (i) above)
only  to the  extent  of the  excess,  if  any,  of the  Carrying  Value  of the
Partnership  Asset over the  aggregate  outstanding  balance of the  Nonrecourse
Debts of superior  priority;  and (iii) only the portion of Carrying  Value of a
Partnership  Asset allocated to Nonrecourse  Debts of the  Partnership  shall be
used in computing the Minimum Gain.

                  Net Income and Net Loss: For any taxable period, (i) the gross
income of the Partnership from all sources, as calculated for federal income tax
purposes by the Partnership (but excluding any item of income or gain taken into
account in  computing  Book Tax Gain or Book Tax  Loss),  plus (ii) any Book Tax
Gain 

                                      -5-
<PAGE>

recognized by the Partnership  during such period,  plus (iii) any income of the
Partnership  that is exempt from federal income tax and not otherwise taken into
account in computing  gross income for federal  income tax purposes,  reduced by
(iv) Depreciation (as defined below),  further reduced by (v) all other items of
expense or  deduction  (other than  Depreciation  (as defined  below))  that are
allowable as deductions to the  Partnership  under the Code for such period (but
excluding any item of expense or deduction  taken into account in computing Book
Tax Gain or Book Tax Loss), further reduced by (vi) any Book Tax Loss recognized
by the  Partnership  during  such  period,  and  further  reduced  by (vii)  any
expenditures of the Partnership described in section 705(a)(2)(B) of the Code or
treated as expenditures  described in section  705(a)(2)(B) of the Code pursuant
to  Regulations  section  1.704-1(b)(2)(iv)(i),  and not  otherwise  taken  into
account in computing  taxable  income  (including for the purposes  hereof,  any
foreign  income  taxes paid or deemed paid by the  Partnership  for  purposes of
section  901, et seq. of the Code).  In computing  Net Income and Net Loss,  all
items of income,  gain, loss, or deduction required to be specially allocated to
one or more Partners pursuant to Section 6.06 shall be excluded.  "Depreciation"
means,  for  each  taxable  period,   an  amount  equal  to  the   depreciation,
amortization,  or other cost  recovery  deductions  allowable  with respect to a
Partnership  Asset for such  period for  federal  income tax  purposes  computed
(using  the same  method  used by the  Partnership  in  computing  depreciation,
amortization,  or other cost recovery deductions in preparing its federal income
tax returns,  or if the Adjusted Basis of the  Partnership  Asset is zero,  such
method as is reasonably  determined  by the General  Partner) as if the Adjusted
Basis of such Partnership  Asset were equal to their Carrying Values.  Except as
otherwise  specifically  provided herein or in the Regulations under section 704
of the Code,  for purposes of computing the amount of any item of income,  gain,
deduction,  or loss in determining  Net Income or Net Loss,  the  determination,
recognition,  and  classification  of  such  item  shall  be  the  same  as  its
determination,  recognition, and classification for federal income tax purposes.
All items of  income,  gain,  loss,  deduction,  and  credit  recognized  by the
Partnership  for federal  income tax purposes  and  allocated to the Partners in
accordance with the provisions of Article VI shall be determined  without regard
to any election  that may be made by the  Partnership  under  section 754 of the
Code  except  as   expressly   contemplated   under  the   Regulations   section
1.704-1(b)(2)(iv)(m)(4);  provided,  however, that such allocations,  once made,
shall be adjusted as necessary to take into account those adjustments authorized
under sections 734 and 743 of the Code.

                  Net Proceeds of a Terminating Capital Transaction:  As defined
in Section 6.01(b).

                  Nonrecourse Debt: Any liability that is considered nonrecourse
for purposes of Regulations  section  1.1001-2  (without  regard to whether such
liability is a recourse liability under Regulations section  1.752-1T(d)(2)) and
any other  liability for which the  creditor's  right to repayment is limited to
one or more of the assets of the Partnership  (within the meaning of Regulations
section 1.752-1T(d)(3)(ii)(B)(4)(ii).

                                      -6-

<PAGE>

                  Nonrecourse  Liability:   Any  Nonrecourse  Debt  (or  portion
thereof) for which no Partner  bears (or is deemed to bear) the economic risk of
loss within the meaning of Regulations section 1.704-1T(b)(4)(iv)(k)(3).

                  Organizational Limited Partner:  Orion Network Systems, Inc.

                  Partner:  A General Partner or a Limited Partner.

                  Partner  Nonrecourse  Debt: Any  Nonrecourse  Debt (or portion
thereof) for which a Partner  bears (or is deemed to bear) the economic  risk of
loss within the meaning of Regulations section 1.704-1T(b)(4)(iv)(k)(1).

                  Partnership:  The limited  partnership created pursuant to the
Certificate and continued by this Agreement.

                  Partnership Assets: All assets and property,  whether tangible
or intangible and whether real, personal, or mixed, at any time owned by or held
for the benefit of the Partnership.

                  Partnership  Interest:  As to any Partner, all of the interest
of  such  Partner  in  the  Partnership,  including,  without  limitation,  such
Partner's  (i) right to a  distributive  share of the income,  gain,  losses and
deductions  of  the  Partnership  in  accordance  herewith,   (ii)  right  to  a
distributive  share of Partnership  Assets,  (iii) rights, if a General Partner,
with respect to the  management  of the business and affairs of the  Partnership
and (iv)  consensual and voting rights,  if a Limited  Partner,  with respect to
certain matters as provided herein.

                  Partnership  Liabilities:  All debts,  liabilities,  and other
obligations of the Partnership.

                  Percentage Interest:  As defined in Section 6.01(c).

                  Person: Any individual, corporation, association, partnership,
joint venture, trust, estate, or other entity or organization.

                  Recording Office:  The office of the Secretary of State of the
State of Delaware.

                  Regulations:  The  regulations  issued  by the  United  States
Department  of the Treasury  under the Code, as now in effect and as they may be
amended from time to time, and any successor regulations.

                  Review Committee:  As defined in Section 7.11(a).

                  Satellite Authorizations: The FCC License, any other satellite
licenses and  authorizations  or rights  thereunder  granted by the FCC or other
governmental  agencies  which  may  be  held  by  the  General  Partner  or  the
Partnership,  and  all  other  permits,  approvals,  consents,   authorizations,
registrations,   consultations,   

                                      -7-


<PAGE>

notifications,  coordinations,  and licenses  necessary or  appropriate  for the
construction, launch or operation of each satellite owned by the Partnership.

                  Satellite   Construction  Contract:  The  Second  Amended  and
Restated Purchase Contract,  dated as of September 24, 1991, between the General
Partner  and British  Aerospace  Public  Limited  Company,  as amended,  as such
agreement has been assigned by the General Partner to the  Partnership  pursuant
to an Assignment and Assumption of Satellite  Construction  Contract between the
General Partner and the Partnership effective as of December 20, 1991.

                  Section 754  Election:  An election  under  section 754 of the
Code relating to the adjustment of the Adjusted Basis of Partnership  Assets, as
provided in sections 734 and 743 of the Code.

                  Ten Year Projection:  As defined in Section 7.11(b)(ii).

                  Terminating  Capital  Transaction:   Any  sale,  condemnation,
exchange,   abandonment,  or  other  disposition,   whether  by  foreclosure  or
otherwise,  of all or substantially all of the then remaining Partnership Assets
and/or  any  other  transaction  which  will  result  in a  dissolution  of  the
Partnership,  or any sale or other disposition of the Partnership  Assets or any
portion thereof or any other transactions in connection with the dissolution and
liquidation of the Partnership pursuant to Article XII.

                  Termination Date:  December 31, 2039.

                  Unrealized  Gain: As to any  Partnership  Asset,  the Book Tax
Gain, if any, that would be realized if such Partnership Asset were sold for its
fair market value on the date of determination.

                  Unrealized  Loss: As to any  Partnership  Asset,  the Book Tax
Loss, if any, that would be realized if such Partnership Asset were sold for its
fair market value on the date of determination.

                  Unrecovered  Contingent  Contributions:  With  respect to each
Limited Partner,  the aggregate amount,  if any, of contingent  payments made by
the Limited Partner or its Affiliate to the  Partnership  pursuant to Article II
of the Contingent  Communications  Satellite  Capacity Agreement or to a payment
guarantee   agreement  in  accordance   with  Article  III  of  the   Contingent
Communications Satellite Capacity Agreement and treated as contributions by such
Partner  to the  capital of the  Partnership  pursuant  to  Section  5.01 of the
Contingent  Communications  Satellite Capacity  Agreement,  reduced, as and when
made,  by the amounts  distributed  to the Limited  Partner in reduction of such
amounts pursuant to Section 6.04(a)(i).

                  Unrecovered Initial Contributions:  In the case of the General
Partner,  $10,000,000,  and in the case of the Limited Partners, the amounts set
forth on 

                                      -8-

<PAGE>

Schedule  A. A  Partner's  Unrecovered  Initial  Contribution  shall be
reduced,  as and when made, by the amounts  distributed to such Partner pursuant
to Section 6.04(a)(ii).

                  Working  Capital  Reserve:  The reserve  for  working  capital
established by the General Partner pursuant to Section 7.05.


                                   ARTICLE II

                PARTNERSHIP CONTINUATION, NAME, PLACE OF BUSINESS


                  2.01.  CONTINUATION  OF  PARTNERSHIP;  CERTIFICATE  OF LIMITED
                         PARTNERSHIP;  DETERMINATION  OF PARTNERSHIP  RIGHTS AND
                         DUTIES.

                  The Partnership was formed on August 17, 1989, pursuant to the
provisions of the Delaware RULPA. The Partners hereby execute this Agreement for
the purpose of continuing  the existence of the  Partnership,  and setting forth
the  rights,  duties,  and  relationship  of the  Partners.  If the  laws of any
jurisdiction in which the Partnership transacts business so require, the General
Partner also shall file, with the  appropriate  office in that  jurisdiction,  a
copy of the  Certificate  as  filed  with  the  Recording  Office  or any  other
documents  necessary for the Partnership to qualify to transact  business and to
establish  and  maintain  the  Limited  Partners'  limited  liability  under the
Delaware RULPA. The Partners  further agree and obligate  themselves to execute,
acknowledge, and cause to be filed for record, in the place or places and manner
prescribed by law, any amendments to the Certificate as may be required,  either
by the Delaware  RULPA,  by the laws of a jurisdiction  in which the Partnership
transacts business, or by this Agreement,  to reflect changes in the information
contained  therein or otherwise to comply with the  requirements  of law for the
continuation,  preservation,  and  operation  of the  Partnership  as a  limited
partnership under the Delaware RULPA.


                  2.02.  NAME OF PARTNERSHIP.

                  The  name  under  which  the  Partnership  shall  conduct  its
business is "International Private Satellite Partners, L.P." The business of the
Partnership  may be  conducted  under any other name  permitted  by the Delaware
RULPA that is deemed necessary or desirable by the General Partner,  in its sole
and absolute discretion.  The General Partner promptly shall execute,  file, and
record any assumed or fictitious name  certificates  required by the laws of the
State of Delaware or any state in which the  Partnership  conducts  business and
shall take such other action as the General  Partner  determines are required by
the laws of the State of Delaware,  or any other state in which the  Partnership
conducts business, to use the name or names under which the Partnership conducts
business.

                                      -9-

<PAGE>


                  2.03.  PLACE OF BUSINESS.

                  The principal  place of business of the  Partnership  shall be
located at 2440 Research Blvd., Suite 400, Rockville,  Maryland 20858-3238.  The
General  Partner may  hereafter  change the  principal  place of business of the
Partnership  to such  other  place or places  within  the  United  States as the
General  Partner  may from  time to time  determine,  in its  sole and  absolute
discretion,  provided that the General Partner shall give written notice thereof
to the Limited  Partners within thirty (30) days after the effective date of any
such change and, if necessary,  shall amend the  Certificate in accordance  with
the applicable  requirements of the Delaware RULPA.  The General Partner may, in
its sole and absolute discretion,  establish and maintain such other offices and
additional  places of business of the Partnership,  either within or without the
State of Delaware, as it deems appropriate.


                  2.04.  REGISTERED OFFICE AND REGISTERED AGENT.

                  The street address of the registered office of the Partnership
shall be 1013 Centre Road,  Wilmington,  Delaware 19805,  and the  Partnership's
registered agent at such address shall be the Corporation Service Company.


                                   ARTICLE III

                       PURPOSES AND POWERS OF PARTNERSHIP


                  3.01.  PURPOSES.

                  The purposes of the Partnership shall be:

                         3.01(a)to    develop    international    communications
satellite  facilities and to engage in the business of providing  communications
and communications-related services;

                         3.01(b) to acquire, hold, own, operate,  lease, manage,
maintain, improve, repair, replace,  reconstruct,  sell, or otherwise dispose of
and otherwise use the Partnership Assets; and

                         3.01(c) to enter into any lawful transaction and engage
in  any  lawful  activity  incidental  to or in  furtherance  of  the  foregoing
purposes.


                  3.02.  POWERS.

The  Partnership  shall  have  the  power  to do any and  all  acts  and  things
necessary,  appropriate,  advisable,  or  convenient  for  the  furtherance  and
accomplishment   of  the  purposes  of  the  Partnership,   including,   without
limitation, the following:

                                      -10-
<PAGE>

                         3.02(a)  to borrow (on a secured  or  unsecured  basis)
money and issue evidences of indebtedness,  and to secure the same by mortgages,
deeds of trust,  security interests,  pledges, or other liens on all or any part
of the Partnership Assets;

                         3.02(b)  to  secure  and  maintain   insurance  against
liability  or other  loss  with  respect  to the  activities  and  assets of the
Partnership (including, without limitation,  insurance against liabilities under
Section 7.09(e));

                         3.02(c)  to  employ or retain  such  persons  as may be
necessary  or  appropriate  for  the  conduct  of  the  Partnership's  business,
including   permanent,   temporary,   or  part-time  employees  and  independent
attorneys, accountants, consultants, and contractors;

                         3.02(d) to acquire,  own, hold,  maintain,  use, lease,
sublease, manage, operate, sell, exchange, transfer, or otherwise deal in assets
and  property  as may  be  necessary  or  convenient  for  the  purposes  of the
Partnership;

                         3.02(e) to incur expenses and to enter into, guarantee,
perform, and carry out contracts, agreements, leases, subleases, and commitments
of any kind, to assume obligations,  and to execute, deliver,  acknowledge,  and
file documents in furtherance of the purposes of the Partnership;

                         3.02(f)  to  pay,   collect,   compromise,   arbitrate,
litigate, or otherwise adjust,  contest, or settle any and all claims or demands
of or against the Partnership;

                         3.02(g)  to  establish  and  maintain  one or more bank
accounts in the name of the  Partnership at such banks as may be selected by the
General  Partner,  to deposit in such account(s) the funds received from time to
time by or on behalf of the  Partnership,  and to pay the debts,  expenses,  and
obligations  of the  Partnership  by checks drawn on such accounts and signed by
the General  Partner or by such other  signatory  as the General  Partner  shall
designate;

                         3.02(h)  to invest  in  interest-bearing  accounts  and
short-term investments,  including, without limitation,  obligations of federal,
state, and local  governments and their agencies,  mutual funds (including money
market funds),  commercial paper, time deposits,  and certificates of deposit of
commercial banks, savings banks, or savings and loan associations; and

                         3.02(i) to engage in any kind of activity  and to enter
into and perform  obligations of any kind necessary to or in connection with, or
incidental to, the accomplishment of the purposes of the Partnership, so long as
said  activities and  obligations  may be lawfully  engaged in or performed by a
limited partnership under the Delaware RULPA.

                                      -11-

<PAGE>

                  3.03.  Limitation on Powers of the Partnership.

                  Notwithstanding  any  provision  in  this  Agreement,  the FCC
License  shall  not be  transferred,  assigned  or  disposed  of in any  manner,
voluntarily  or  involuntarily,  including  by any  transfer  of  control of any
corporation holding that license, to any person except upon a finding by the FCC
that the public convenience and necessity will be served thereby.


                                   ARTICLE IV

                               TERM OF PARTNERSHIP


                  4.01.  TERM.

                  The Partnership  commenced when the Certificate was duly filed
with the  Recording  Office on August 17,  1989,  and shall  continue  until the
Termination  Date unless extended beyond the Termination Date in accordance with
the provisions of Section 12.02, or unless  dissolved and liquidated  before the
Termination Date in accordance with the provisions of Article XII.


                                    ARTICLE V

                                     CAPITAL


                  5.01.  CAPITAL CONTRIBUTION OF GENERAL PARTNER.

                         5.01(a) Prior to the  effectiveness  of this Agreement,
the General  Partner has  contributed to the  Partnership  certain  tangible and
intangible assets as set forth on Schedule A. It is acknowledged and agreed that
such Capital  Contributions of the General Partner have Carrying Value of Thirty
Million Dollars ($30,000,000.00).

                         5.01(b)  The General  Partner  shall not be required to
make any contributions to the capital of the Partnership other than as set forth
in this Section 5.01.


                  5.02.  [INTENTIONALLY OMITTED.]


                  5.03.  CAPITAL CONTRIBUTIONS OF LIMITED PARTNERS.

                         5.03(a) Concurrently with or immediately  preceding the
effectiveness  of this  Agreement,  and pursuant to the terms of a  Subscription
Agreement  executed by each  Limited  Partner,  each Limited  Partner  listed on
Schedule A is making or has made a Capital  Contribution in the amount set forth

                                      -12-
<PAGE>

opposite  its name on  Schedule  A. The  Capital  Contribution  of each  Limited
Partner shall be made in cash, by wire transfer, by certified or cashier's check
payable to the order of the  Partnership  or its  designated  agent,  or in such
other form as is approved  by the General  Partner,  and shall be  reflected  on
Schedule A.

                         5.03(b)  Contemporaneously  with the  execution of this
Agreement,  each of certain  Limited  Partners or their  Affiliates are entering
into a Contingent  Communications Satellite Capacity Agreement pursuant to which
the Limited  Partner or its  Affiliate may be required from time to time to make
contingent  payments to the  Partnership.  Any such contingent  payments and any
contingent  payments pursuant to a Payment  Guarantee  Agreement entered into in
accordance with the Contingent  Communications Satellite Capacity Agreement made
by a Limited  Partner or its Affiliate will be treated as capital  contributions
to the Partnership by the Limited Partner to the extent provided in Section 5.01
of the Contingent Communications Satellite Capacity Agreement.

                         5.03(c) The Limited  Partners  shall not be required to
make any contributions to the capital of the Partnership other than as set forth
in this Section 5.03.


                  5.04.  CAPITAL ACCOUNTS.

                         5.04(a) A separate Capital Account shall be established
and  maintained  for each Partner in all events in accordance  with the rules of
Regulations section 1.704-1(b)(2)(iv), as amended from time to time. In general,
the Capital Account of each Partner shall be credited with:

                           (i) the amount of cash and the Carrying  Value of any
                  property (net of liabilities  assumed by the  Partnership  and
                  liabilities  to which the  contributed  property  is  subject)
                  contributed to the Partnership by such Partner, plus

                           (ii) all Net  Income  and items of income and gain of
                  the Partnership  specially  allocated pursuant to Section 6.06
                  (computed in  accordance  with Section  5.04(b))  allocated to
                  such Partner  pursuant to Sections 6.02(a) and 6.06 (including
                  for  purposes of this Section  5.04(a)  income and gain exempt
                  from tax);

and shall be debited with the sum of:

                           (iii) all Net Losses  and items of loss or  deduction
                  of the  Partnership  specially  allocated  pursuant to Section
                  6.06 (computed in accordance with Section  5.04(b))  allocated
                  to such Partner pursuant to Sections 6.02(b) and 6.06, and

                                      -13-

<PAGE>

                           (iv)  all  cash  and the  fair  market  value  of any
                  property  (net of  liabilities  assumed  by such  Partner  and
                  liabilities to which such property is subject)  distributed by
                  the Partnership to such Partner.

Any  reference in this  Agreement to the Capital  Account of a Partner  shall be
deemed to refer to such  Capital  Account as the same may be credited or debited
from time to time as set forth above.

                         5.04(b)  Except as otherwise  required  pursuant to the
Regulations  under section 704 of the Code, for purposes of computing the amount
of any item of  income,  gain,  deduction,  or loss to be  reflected  in Capital
Accounts, the determination,  recognition,  and classification of each such item
shall be the same as its determination,  recognition,  and classification of Net
Income and Net Loss, provided that:

                           (i)  immediately  prior  to  decreasing  a  Partner's
                  Capital  Account to reflect any  distribution of a Partnership
                  Asset to him (other than cash), all Partners' Capital Accounts
                  shall  be   adjusted  to  reflect  the  manner  in  which  the
                  Unrealized   Gain  or   Unrealized   Loss   inherent  in  such
                  Partnership  Asset (that has not been reflected in the Capital
                  Accounts  previously) would be allocated among the Partners if
                  there were a taxable disposition of such Partnership Asset for
                  its fair  market  value  (but not less than the  amount of any
                  Nonrecourse Debt secured by such Partnership Asset); and

                           (ii)  adjustment  to a Partner's  Capital  Account in
                  respect of Partnership income, gain, loss, deduction, and Code
                  section 705(a)(2)(B) expenditures (as described in Regulations
                  section 1.704-1(b)(2)(iv)(i)) (or items thereof) shall be made
                  with  reference  to the  federal tax  treatment  of such items
                  (and,  in the case of book tax items,  with  reference  to the
                  federal tax treatment of the  corresponding  tax items) at the
                  Partnership level,  without regard to any required or elective
                  tax treatment of such items at the Partner level.

                         5.04(c) A Partner  shall be considered to have only one
Capital Account.

                         5.04(d)  The  General  Partner,  with  the  review  and
concurrence of the Partnership's  certified public  accountants,  shall have the
discretion to increase or decrease the Capital Account  balances of the Partners
to reflect a revaluation of Partnership Assets on the Partnership's books to the
extent required or permitted by the  Regulations.  Any such  adjustments must be
based  on  the  fair  market  value  of the  Partnership  Assets  as  reasonably
determined by the General Partner  (provided that no Partnership  Asset shall be
valued at an amount  less than any  Nonrecourse  Debt to which such  Partnership
Asset is subject on the date of adjustment) and must reflect the manner in which
the Unrealized Gain or Unrealized Loss inherent in such Partnership Assets (that
has not been reflected in 

                                      -14-
<PAGE>

a Capital  Account  previously)  would be allocated  among the Partners if there
were a taxable disposition of such Partnership Assets for such fair market value
on that date.

                         5.04(e)  Subject  to  Section  5.04(g),  any  permitted
transferee  of a  Partnership  Interest  hereunder  shall succeed to the Capital
Account relating to the Partnership Interest transferred.

                         5.04(f) Any special basis adjustments resulting from an
election  by the  Partnership  pursuant  to section 754 of the Code shall not be
taken into  account  for any purpose in  establishing  and  maintaining  Capital
Accounts  for  the  Partners,   except  as  provided  in   Regulations   section
1.704-1(b)(2)(iv)(m).

                         5.04(g)  If any  transfer  of a  Partner's  Partnership
Interest causes a termination of the Partnership  under section  708(b)(1)(B) of
the Code, the Capital Account that carries over to the transferee  Partner shall
be adjusted in  accordance  with  Regulations  section  1.704-1(b)(2)(iv)(e)  in
connection  with  the   constructive   liquidation  of  the  Partnership   under
Regulations section 1.708-1(b)(1)(iv). Moreover, the constructive reformation of
the Partnership will be treated as the formation of a new  Partnership,  and the
Capital  Accounts of the Partners in such new Partnership will be determined and
maintained  accordingly taking into account, for example, the difference between
the fair market value of the  Partnership  Asset and its  Carrying  Value on the
date of such constructive reformation.

                         5.04(h) The  foregoing  provisions of this Section 5.04
and any other provisions of the Agreement relating to the maintenance of Capital
Accounts are intended to comply with Regulations  section  1.704-1(b)(2)(iv)  as
they currently exist and as they subsequently may be amended,  and they shall be
interpreted  and applied in a manner  consistent with such  Regulations.  In the
event the General Partner  determines in its reasonable  discretion,  subject to
the review and concurrence of the  Partnership's  certified public  accountants,
that it is prudent to modify the manner in which the  Capital  Accounts,  or any
debits  or  credits  thereto,   are  computed  in  order  to  comply  with  such
Regulations, the General Partner may make such modification, provided that it is
not likely to have a material effect on the amounts distributable to any Partner
upon dissolution of the Partnership.


                  5.05.  NEGATIVE CAPITAL ACCOUNTS.

                  Except to the extent the  Partners  are  required  or elect to
make  contributions  to the capital of the  Partnership  under Sections 5.01 and
5.03,  no Partner  shall be required to pay to the  Partnership  or to any other
Partner  any deficit or  negative  balance  which may exist from time to time in
such Partner's Capital Account.

                                      -15-
<PAGE>


                  5.06.  NO INTEREST ON AMOUNTS IN CAPITAL ACCOUNT.

                  No Partner  shall be entitled  to receive any  interest on its
outstanding Capital Account balance.


                  5.07.  ADVANCES TO PARTNERSHIP.

                  If any  Partner  shall  advance  funds to the  Partnership  in
excess of the amounts required  hereunder to be contributed by it to the capital
of  the  Partnership  and  which  do  not  constitute   Unrecovered   Contingent
Contributions,  the making of such advances  shall not result in any increase in
the amount of such  Partner's  Capital  Account or entitle it to any increase in
its  Percentage  Interest.  The amounts of such advances  shall be a debt of the
Partnership to the Partner and shall be payable or  collectible  only out of the
Partnership  Assets in accordance  with the terms and conditions upon which such
advances are made.  Any such advances  shall be repayable  upon demand and shall
bear interest at the rate equal to two (2) percentage  points above the "Federal
Short-Term Rate" as defined in Code section 1274(d)(1)(C)(i) or the maximum rate
permitted  under  applicable  law,  whichever  is  less,   calculated  upon  the
outstanding  principal  balance  of such  advances  as of the  first day of each
month.


                  5.08.  LIABILITY OF LIMITED PARTNERS.

                  Except as provided in the Delaware RULPA,  none of the Limited
Partners  shall be personally  liable for any debts,  liabilities,  contracts or
obligations of the  Partnership.  A Limited Partner shall be liable only to make
payments of such  Limited  Partner's  Capital  Contribution  pursuant to Section
5.03.  Except as provided in the Delaware  RULPA,  after such Limited  Partner's
Capital  Contribution  has been fully paid, no Limited Partner shall be required
to  make  any  further  capital  contributions  or to  lend  any  funds  to  the
Partnership.


                  5.09.  RETURN OF CAPITAL.

                  Except upon the  dissolution  of the  Partnership or as may be
specifically  provided  in this  Agreement,  no Partner  shall have the right to
demand or to receive the return of all or any part of its Capital Account or its
contributions to the capital of the Partnership.

                                      -16-

<PAGE>

                                   ARTICLE VI

                 ALLOCATION OF PROFITS AND LOSSES; DISTRIBUTIONS
                        OF CASH FLOW AND CERTAIN PROCEEDS


                  6.01.  CERTAIN DEFINITIONS.

                         6.01(a)  "Cash Flow" shall mean and refer to the sum of
the following:

                           (i) the Net Income  (or Net Loss) of the  Partnership
                  for the  period for which such  determination  is being  made,
                  excluding items of income,  gain,  loss, or deduction from any
                  Terminating  Capital  Transaction,  increased  to reflect  any
                  items of income or gain and  decreased to reflect any items of
                  loss or deduction required to be specially allocated to one or
                  more Partners  pursuant to Sections  6.06(a)  through  6.06(e)
                  (collectively,  "Specially  Allocated Items") increased by (A)
                  the amount of  Depreciation  and  similar  deductions  in lieu
                  thereof  deductible by the  Partnership  in computing such Net
                  Income or Net Loss or treated as  Specially  Allocated  Items,
                  and any other deductions taken into account in determining Net
                  Income or Net Loss or treated as Specially Allocated Items for

                  such period that are not matched by cash payments  during such
                  period,  and (B) any  receipts  of the  Partnership  for  such
                  period  that are not  either  includible  in  determining  Net
                  Income or Net Loss or treated as Specially Allocated Items for
                  such period and the  proceeds of any loans to the  Partnership
                  but   excluding   proceeds   from  any   Terminating   Capital
                  Transaction;  and reduced by (AA) payments from the sum of the
                  foregoing  during such period on the  principal of any loan to
                  the  Partnership or in  satisfaction  of other  obligations to
                  holders of  Partnership  debt  (other  than  distributions  to
                  Partners  pursuant  to this  Article  VI) to the  extent  such
                  payments  have  not  otherwise  reduced  the  Net  Income  (or
                  increased the Net Loss or been treated as Specially  Allocated
                  Items)  of the  Partnership  for such  period,  (BB) all other
                  expenditures  from  the  sum of  the  foregoing  not  financed
                  through any reserves  previously set aside by the  Partnership
                  for such purposes and not deducted in  determining  Net Income
                  or Net Loss or treated as Specially  Allocated  Items for such
                  period, (CC) any amounts included in determining Net Income or
                  Net Loss or  treated  as  Specially  Allocated  Items for such
                  period that were not received by the  Partnership  during such
                  period,  and (DD)  transfers  from the sum of the foregoing to
                  the Working Capital Reserve pursuant to Section 7.05; plus

                           (ii) any other funds  (including  amounts  previously
                  set  aside  in the  Working  Capital  Reserve  by the  General
                  Partner  if and to the extent  the  General  Partner no longer
                  regards such amounts as 

                                      -17-
<PAGE>

                         reasonably  needed in connection  with the operation of
                         the business of the  Partnership)  deemed available for
                         distribution and designated as Cash Flow by the General
                         Partner.

                         6.01(b)  "Net   Proceeds  of  a   Terminating   Capital
Transaction" means the proceeds received by the Partnership in connection with a
Terminating Capital Transaction,  after the payment of all costs and terminating
expenses of any kind or nature  incurred by the  Partnership in connection  with
such Terminating Capital Transaction.

                         6.01(c)  "Percentage  Interests" of the General Partner
and the  Limited  Partners  are as set forth on Schedule B, as it may be amended
from time to time.


                  6.02.  Allocation of Net Income or Net Loss.

                  Net Income or Net Loss of the Partnership for each Fiscal Year
(or portion thereof) during the term of this Agreement shall be allocated to the
Partners (after  allocating to the Partners any amounts required to be allocated
to them with  respect to such  Fiscal  Year (or  portion  thereof)  pursuant  to
Section 6.06 and after reducing their  respective  Capital Accounts for all Cash
Flow distributed  during or with respect to such Fiscal Year under Section 6.04,
but  before  taking  into  account  any  allocations  of Net  Income or Net Loss
pursuant  to this  Section  6.02 with  respect to such  Fiscal  Year (or portion
thereof)), as follows:

                         6.02(a)  Subject to  Section  6.06  (including  Section
6.06(f)),  any Net Income of the Partnership with respect to a Fiscal Year shall
be allocated to the Partners as follows and in the following order of priority:

                           (i) First: If a Terminating  Capital  Transaction has
                  occurred,  to the Partners,  if any, with negative balances in
                  their  Capital  Accounts,  pro  rata,  in  proportion  to  the
                  negative  balances in their respective  Capital Accounts until
                  their respective Capital Account balances equal zero;

                           (ii) Second: To the Limited  Partners,  to the extent
                  of, and in proportion  to, the amounts (if any) by which their
                  Unrecovered  Contingent  Contributions exceed their respective
                  Capital Account balances (after giving effect to the preceding
                  provisions of this Section 6.02(a));

                           (iii) Third:  To the Partners,  to the extent of, and
                  in  proportion  to, the  amounts  (if any) by which the sum of
                  their   Unrecovered   Contingent   Contributions   and   their
                  Unrecovered  Initial  Contributions  exceed  their  respective
                  Capital Account balances (after giving effect to the preceding
                  provisions of this Section 6.02(a));


                                      -18-
<PAGE>


                           (iv)  Fourth:   To  the  Partners,   in  the  amounts
                  necessary  to cause  their  Capital  Account  balances  (after
                  giving  effect to the  preceding  provisions  of this  Section
                  6.02(a)) in excess of the sum of their respective  Unrecovered
                  Contingent   Contributions   (if  any)  and  their  respective
                  Unrecovered  Initial  Contributions (if any) to be in the same
                  proportion as their respective Percentage Interests; and

                           (v) Fifth:  The balance of such Net  Income,  if any,
                  shall be allocated to the  Partners,  pro rata,  in accordance
                  with their Percentage Interests.

                         6.02(b)  Subject to  Section  6.06  (including  Section
6.06(f),  any Net Loss of the Partnership with respect to a Fiscal Year shall be
allocated to the Partners as follows and in the following order of priority:

                           (i) First: To the Partners, until the Capital Account
                  balances  of  the  Partners  in  excess  of the  sum of  their
                  respective Unrecovered  Contingent  Contributions (if any) and
                  their respective  Unrecovered  Initial  Contributions (if any)
                  are eliminated, with such Net Loss to be allocated first so as
                  to cause all Partners'  Capital  Accounts in excess of the sum
                  of their respective Unrecovered  Contingent  Contributions and
                  their respective Unrecovered Initial Contributions (if any) to
                  be in the same proportion as their Percentage  Interests,  and
                  thereafter  in  accordance   with  the  Partners'   Percentage
                  Interests;

                           (ii)  Second:  To the  Partners,  until  the  Capital
                  Account balances of the Partners in excess of their respective
                  Unrecovered Contingent  Contributions (if any) are eliminated,
                  with  such Net Loss to be  allocated  first so as to cause all
                  Partners'  Capital  Accounts  in  excess  of their  respective
                  Unrecovered  Contingent   Contributions  to  be  in  the  same
                  proportion   as   their   respective    Unrecovered    Initial
                  Contributions,  and  thereafter in the same  proportion as the
                  Partners' respective Unrecovered Initial Contributions:

                           (iii) Third: To the Limited  Partners,  to the extent
                  of,  and in  proportion  to, the  amounts of their  respective
                  Unrecovered Contingent Contributions; and

                           (iv)  Fourth:  The balance of such Net Loss,  if any,
                  shall be allocated to the  Partners in  accordance  with their
                  Percentage Interests.

                                      -19-

<PAGE>

                  6.03.  ALLOCATION   OF  INCOME   AND  LOSS  WITH   RESPECT  TO
                         PARTNERSHIP INTERESTS TRANSFERRED.

                  If any Partnership  Interest is transferred  during any Fiscal
Year, the Net Income or Net Loss  attributable to such Partnership  Interest for
such  Fiscal  Year shall be divided and  allocated  proportionately  between the
transferor and the transferee based upon the number of days during such calendar
year for which each party was the owner of the  interest  transferred,  provided
that such  method of  allocating  Net  Income  and Net Loss  with  respect  to a
transferred  Partnership  Interest  is not  prohibited  under  the  Code  or the
Regulations.  Notwithstanding any provision herein to the contrary, any Book Tax
Gain  or  Book  Tax  Loss  of the  Partnership  realized  in  connection  with a
Terminating  Capital  Transaction  shall be  allocated  only to Persons  who are
holders  of  Partnership  Interests  as of the  date  such  Terminating  Capital
Transaction occurs.


                  6.04.  DISTRIBUTION OF CASH FLOW.

                           6.04(a)  Cash  Flow  of  the  Partnership   shall  be
determined for each Fiscal Year. Cash Flow as so determined shall be distributed
to the Partners as follows:

                           (i) First: To the Limited Partners, to the extent of,
                  and  in  proportion  to,  the  amounts  of  their  Unrecovered
                  Contingent Contributions (if any);

                           (ii) Second:  To the Partners,  to the extent of, and
                  in  proportion  to, the amounts of their  Unrecovered  Initial
                  Contributions; and

                           (iii) Third: To the Partners, pro rata, in accordance
                  with their Percentage Interests.

                           6.04(b) Cash Flow, if any,  shall be  distributed  at
least annually within  seventy-five (75) days after the end of each Fiscal Year,
commencing with the Fiscal Year ending December 31, 1990.  Distributions of Cash
Flow made within the first  seventy-five  (75) days of a subsequent  Fiscal Year
and  designated by the General  Partner as made with respect to the  immediately
prior  Fiscal Year shall be  considered  made with  respect to such prior Fiscal
Year  for  purposes  of  Section  6.02  and  shall  be  distributed  based  upon
Unrecovered Contingent  Contributions,  Unrecovered Initial  Contributions,  and
Percentage  Interests as of the last day of such prior  Fiscal  Year.  Cash Flow
also may be  distributed,  in the sole and  absolute  discretion  of the General
Partner,  at such other time or times during any Fiscal Year in  anticipation of
the year-end  determination  thereof, and such distributions shall be subject to
year-end  adjustment.  The Partners  agree that,  within  thirty (30) days after
determination by the Partnership that an overpayment was made to any Partner for
any Fiscal Year pursuant to this Section 6.04,  such Partner shall repay,  allow
as a credit against future distributions,  or make such other adjustments as 

                                      -20-


<PAGE>

the General  Partner  determines to be appropriate  to remedy such  overpayment.
Likewise, appropriate adjustment shall be made to remedy any underpayment.


                  6.05.  DISTRIBUTION  OF  PROCEEDS  FROM  TERMINATING   CAPITAL
                         TRANSACTIONS.

                         6.05(a)  The  Net  Proceeds  of a  Terminating  Capital
Transaction and any other remaining  assets of the Partnership to be distributed
to  the  Partners  in  connection  with   dissolution  and  liquidation  of  the
Partnership pursuant to Article XII, after the payment of, or provision for, all
debts and  liabilities of the  Partnership  to all creditors of the  Partnership
(including,  without  limitation,  all  amounts  owing to a Partner  under  this
Agreement (other than this Article VI) or under any other agreement  between the
Partnership  and a  Partner),  the payment of  expenses  of  liquidation  of the
Partnership,  and the establishment of a reasonable reserve (including,  without
limitation,  an amount  estimated by the General Partner to be sufficient to pay
any amount  reasonably  anticipated  to be required  pursuant to Section  7.09),
shall  be  distributed  (i) if  such  dissolution  occurs  pursuant  to  Section
12.01(h),  by distributing to the General Partner the property contributed by it
to the Partnership as listed on Schedule A of this Agreement,  and  distributing
all remaining  Partnership Assets to the Limited Partners pro rata in proportion
to the  amounts  of  their  respective  Capital  Contributions  as set  forth on
Schedule A of this  Agreement,  and (ii) if such  dissolution  occurs  under any
other circumstances, to the Partners as follows:

                         (A) First: To the Limited  Partners,  to the extent of,
                  and  in  proportion  to,  the  amounts  of  their  Unrecovered
                  Contingent Contributions (if any);

                         (B) Second:  To the Partners,  to the extent of, and in
                  proportion  to,  the  amounts  of  their  Unrecovered  Initial
                  Contributions; and

                         (C) Third:  To the  Partners,  pro rata,  in accordance
                  with their Percentage Interests.

Distributions  pursuant to this Section  6.05(a) shall be made by the end of the
Fiscal Year in which such Terminating  Capital  Transaction occurs or, if later,
within ninety (90) days of such Terminating Capital Transaction.

                         6.05(b)  Notwithstanding  any provision in this Section
6.05 to the  contrary,  in the event that the Net  Proceeds  of the  Terminating
Capital  Transaction  are to be  paid  to  the  Partnership  in  more  than  one
installment,  each such  installment  (including any interest  thereon) shall be
allocated  among the Partners in accordance with their  respective  "Installment
Percentages".  The  "Installment  Percentage"  of each Partner  shall be (i) the
aggregate  amount of cash that would have been distributed to that Partner under
this Section 6.05 had the Net Proceeds of the  Terminating  Capital  Transaction
been paid in one lump sum 

                                      -21-
<PAGE>


divided by (ii) the total Net Proceeds that would have been  distributed  to all
of the Partners under this Section under such circumstances.


                  6.06.  SPECIAL ALLOCATION RULES.

                  The following allocation rules shall apply notwithstanding the
provisions of Section 6.02,  and the provisions of Section 6.02 shall be applied
only  after  giving  effect to the  following  rules.  In the  event  there is a
conflict  between any of the  following  rules,  the  earlier  listed rule shall
govern.

                         6.06(a) If in any Fiscal  Year there is a net  increase
during  such  year  in the  amount  of  Minimum  Gain  attributable  to  Partner
Nonrecourse  Debts,  the  Partner(s)  that bear the  economic  risk of loss with
respect    thereto    (within    the    meaning    of    Regulations     section
1.704-1T(b)(4)(iv)(k)(1)) shall be specially allocated items of Partnership loss
or  deduction  in an amount  equal to the  excess of (i) the  amount of such net
increase, over (ii) the aggregate amount of any distributions during such Fiscal
Year to such  Partner(s) of the proceeds of such debt that are allocable to such
increase  in Minimum  Gain.  Items to be so  allocated  shall be  determined  in
accordance with Regulations section 1.704-1T(b)(4)(iv)(h).

                         6.06(b) If in any Fiscal  Year there is a net  decrease
in the Partnership's Minimum Gain attributable to Nonrecourse Liabilities during
such Fiscal Year, each Partner shall be specially allocated items of Partnership
income and gain for such Fiscal Year (and, if necessary,  for subsequent  Fiscal
Years) in proportion to, and to the extent of, an amount equal to the greater of
the following:

                         (i) the  portion  of such  Partner's  share  of the net
                  decrease in such Minimum Gain during such Fiscal Year (as such
                  share  is   determined   pursuant   to   Regulations   section
                  1.704-1T(b)(4)(iv)(f)) that is allocable to the disposition of
                  Partnership  property  subject  to  one  or  more  Nonrecourse
                  Liabilities (as such allocable portion is determined  pursuant
                  to Regulations section 1.704-1T(b)(4)(iv)(e)(2)); or

                         (ii) such Partner's  Excess Negative Balance at the end
                  of such Fiscal Year.

It is the  intent  of the  Partners  that  items  to be so  allocated  shall  be
determined  and the  allocations  made in accordance  with  Regulations  section
1.704-1T(b)(4)(iv)(e).

                         6.06(c) If in any Fiscal  Year there is a net  decrease
in the  Partnership's  Minimum Gain  attributable to Partner  Nonrecourse  Debts
during such Fiscal Year, the Partner(s) that bear the economic risk of loss with
respect to such Partner  Nonrecourse  Debts  (within the meaning of  Regulations
section   1.704-1T(b)(4)(iv)(k)(1))   shall  be  specially  allocated  items  of
Partnership  income  and gain for such  Fiscal  Year  (and,  if  necessary,  for
subsequent Fiscal Years) in an amount equal to the greater of the following:

                                      -22-
<PAGE>

                           (i) the net decrease in such Minimum Gain during such
                  Fiscal  Year  that  is   allocable  to  the   disposition   of
                  Partnership   property   subject   to  one  or  more   Partner
                  Nonrecourse  Debts (as such  allocable  portion is  determined
                  pursuant to Regulations section 1.704-1T(b)(4)(iv)(h)(6)); or

                           (ii)  such  Partner's   (Partners')  Excess  Negative
                  Balance at the end of such Fiscal Year.

It is the  intent  of the  Partners  that  items  to be so  allocated  shall  be
determined  and the  allocation  made in  accordance  with  Regulations  section
1.704-1T(b)(4)(iv)(h)(6).

                         6.06(d)   For   purposes  of   allocating   Partnership
Nonrecourse  Liabilities  among the  Partners  pursuant to  Regulations  section
1.752-1T(a)(2)(i),  the  respective  interests  of the  Partners in  Partnership
profits shall be equal to their respective  Percentage  Interests as of the date
with respect to which the determination is made.

                         6.06(e) No Net Loss or  Partnership  deductions for any
Fiscal Year shall be  allocated  to any  Partner to the extent  such  allocation
would cause or increase an Excess  Negative  Balance in such  Partner's  Capital
Account.  In the event a  Partner  receives  with  respect  to a Fiscal  Year an
adjustment,  allocation,  or distribution (whether or not expected) described in
subparagraphs (4), (5), or (6) of Regulations section  1.704-1(b)(2)(ii)(d) that
causes or  increases  an  Excess  Negative  Balance  in such  Partner's  Capital
Account,  such Partner shall be specially allocated for such Fiscal Year (and if
necessary, in subsequent Fiscal Years) items of income and gain in an amount and
manner  sufficient  to  eliminate  such Excess  Negative  Balance as promptly as
possible as provided in Regulations section 1.704-1(b)(2)(ii)(d).

                         6.06(f) For purposes of determining the balances in the
Capital  Accounts of the  Partners  in order to allocate  Net Income or Net Loss
pursuant to Section 6.02, each Partner's Capital Account balance shall be deemed
to include any amount  that such  Partner is deemed to be  obligated  to restore
pursuant  to  the  penultimate  sentences  of  sections  1.704-1T(b)(iv)(f)  and
1.704-1T(b)(4)(iv)(h)(5)  of the Treasury  Regulations  (determined after taking
into account any changes during such year in Minimum Gain).

                         6.06(g) Notwithstanding the provisions of Section 6.02,
in the event that any fees, interest,  or other amounts paid to a Partner, or an
Affiliate of a Partner, pursuant to this Agreement, or any agreement between the
Partnership  and the  Partner or  Affiliate  providing  for the  payment of such
amounts,  and  deducted  by the  Partnership  for  federal  or other  income tax
purposes, whether in reliance on sections 162, 163, 707(a), and/or 707(c) of the
Code or  otherwise,  are  disallowed as  deductions  to the  Partnership  on its
applicable  income tax return  for the Fiscal  Year in or with  respect to which
such amounts are claimed, and are treated instead as Partnership  distributions,
then there shall be allocated  to the Partner who  received (or whose  Affiliate
received) such payments,  prior to the 

                                      -23-
<PAGE>

allocations  pursuant to Sections 6.02(a) and 6.02(b), an amount of gross income
of the  Partnership for the Fiscal Year in or with respect to which such claimed
deduction  was  disallowed  equal to the  amount of such  deduction  that was so
disallowed and treated as a Partnership distribution.

                         6.06(h) Notwithstanding the provisions of Section 6.02,
in the event that the  Partnership  is a party to an agreement with a Partner or
an Affiliate of a Partner and the  Partnership  is deemed to have taxable income
in respect of such agreement in excess of the amount payable to the  Partnership
by such Partner or Affiliate thereunder, then:

                           (i) there shall be  allocated to the Partner who is a
                  party (or whose Affiliate is a party) to such agreement, prior
                  to the allocations  pursuant to Sections  6.02(a) and 6.02(b),
                  an amount of gross  income of the  Partnership  for the Fiscal
                  Year in or with respect to which the  Partnership is deemed to
                  have  such  additional  income  equal  to the  amount  of such
                  additional income; and

                           (ii)  the   Partnership   shall  be  deemed  to  have
                  distributed to such Partner,  in addition to all other amounts
                  distributable hereunder, during such Fiscal Year an additional
                  amount of cash equal to the amount of such additional income.

                         6.06(i) Notwithstanding the provisions of Section 6.02,
in the event that the  Partnership  is a party to an agreement with a Partner or
an Affiliate of a Partner and the Partnership is deemed by any applicable taxing
authority to have a tax deduction in respect of either amounts deemed payable by
the  Partnership  under such agreement or amounts  distributable  to the Partner
under this Agreement, then:

                           (i) there  shall be  allocated  to the Partner who is
                  the party (or whose Affiliate is a party) to such agreement or
                  who  is  to  receive  the  amount   distributable  under  this
                  Agreement,  prior  to the  allocations  pursuant  to  Sections
                  6.02(a)  and  6.02(b),   an  amount  of   deductions   of  the
                  Partnership  for the Fiscal  Year in or with  respect to which
                  the  Partnership is deemed to have such  additional  deduction
                  equal to the amount of such additional deduction; and

                           (ii) the Partnership shall be deemed to have received
                  from  such   Partner,   in  addition  to  all  other   amounts
                  contributed  hereunder,  an  additional  contribution  of cash
                  equal to the amount of such additional deduction.

                         6.06(j)  Except as otherwise  specifically  provided in
this Agreement or applicable  Treasury  Regulations  and as provided in the next
sentence below, the distributive  share of a Partner of each specific  deduction
and item of income, gain, loss, and credit of the Partnership for federal income
tax  purposes  for 

                                      -24-
<PAGE>

any Fiscal Year and each other item taken into account in  computing  Net Income
or Net Loss for such Fiscal Year (including,  without limitation,  income exempt
from federal income tax and  expenditures  described in section  705(a)(2)(B) of
the Code or treated as such expenditures in the Regulations under section 704(b)
of the Code) shall be the same as such Partner's proportionate share (determined
as set forth in Section 6.02) of Net Income or Net Loss, as the case may be, for
such Fiscal Year,  provided that if there is not Net Income or Net Loss for such
Fiscal Year, all such items shall be allocated  among the Partners in accordance
with their respective Percentage Interests.  Notwithstanding the foregoing,  (i)
any  income  recognized  pursuant  to  sections  1245 and 1250 of the Code  with
respect to a Fiscal Year and allocated to the Partners  pursuant to Section 6.02
shall be allocated, to the extent possible, to the Partners to whom (or to whose
predecessors in interest) the prior depreciation  deductions giving rise to such
income or recapture were allocated, provided that the amount of income allocable
to a Partner  pursuant to this  clause  with  respect to a Fiscal Year shall not
exceed the total amount of income  otherwise  allocable  to such  Partner  under
Sections  6.02 and 6.06 with respect to such Fiscal  Year,  and (ii) any foreign
tax credits for any Fiscal Year shall be allocated to the Partners in accordance
with their  respective  Percentage  Interests at the time the foreign tax giving
rise to such credit was paid.

                         6.06(k)  It is the  intent  of the  Partners  that each
Partner's  distributive  share of  income,  gain,  loss,  and  credit  (or items
thereof)  shall be  determined  and  allocated in each Fiscal Year in accordance
with this Article VI to effect the  distributions  (including  distributions  of
proceeds  of  Terminating  Capital   Transactions)  in  the  order  of  priority
contemplated by Section  6.04(a) to the extent  permitted by Code section 704(b)
and  the  applicable   Regulations.   In  order  to  achieve  the   contemplated
distributions provided for in this Article VI, the General Partner is authorized
and directed to allocate income,  gain, loss, and credit (or items thereof) with
respect to any Fiscal Year in a manner  different from that  otherwise  provided
for in this Article VI if, and to the extent that,  (i) an allocation of income,
gain,  loss,  or credit (or items  thereof) in the manner  provided  for in this
Article  VI would not  achieve  the  intended  economic  result  desired  by the
Partners  or  (ii)  based  on  the  advice  of  the  Partnership's   counsel  or
accountants,  an  allocation  provided  for in this Article VI is unlikely to be
respected under Code section 704(b) and the alternative allocation to be made by
the General Partner is reasonably likely to be respected  (referred to as a "new
allocation").  The General Partner is authorized to make a new allocation  under
this  Section  6.06(k)  only  after  having  determined  both  (i)  that the new
allocation  either more  accurately  effects all  distributions  in the order of
priority  contemplated by the Partners as set forth in Section 6.04(a) or is not
inconsistent with those  distributions and (ii) that the new allocation will not
have a  material  adverse  effect  on the  economic  interests  of the  Partners
(including, without limitation, causing them to recognize income that they would
not otherwise be required to recognize or to lose the benefit of deductions that
they otherwise  would have been permitted to recognize).  New allocations by the
General  Partner in accordance  with this Section  6.06(k) shall not require the
consent of the other Partners.

                                      -25-

<PAGE>

                  6.07.  CONTRIBUTED PROPERTY;  REVALUATIONS PURSUANT TO SECTION
                         704(B) REGULATIONS.

                         6.07(a) In the event that any property  contributed  to
the  Partnership or revalued  pursuant to the provisions of Regulations  section
1.704-1(b)(2)(iv)(f)  has a Carrying  Value that differs from the Adjusted Basis
of such property at the time of its  contribution  or  revaluation,  any income,
depreciation,  gain, or loss with respect to such property shall, solely for tax
purposes, be allocated among the Partners in a manner that takes such difference
into  account  and is  consistent  with Code  section  704(c),  the  Regulations
thereunder,      and      Regulations      section      1.704-1(b)(2)(iv)(f)(4),
1.704-1(b)(2)(iv)(g),  and  1.704-1(b)(4)(i).  The allocations  made pursuant to
this  Section 6.07 shall be made solely for tax purposes and shall not affect or
in any way be taken into account in computing any Partner's  Capital  Account or
share  of Net  Income,  Net  Loss,  Book  Tax  Gain,  Book  Tax  Loss,  or other
allocations or distributions under this Agreement.

                         6.07(b)  The  Partners  acknowledge  that the  Carrying
Value of the  assets  contributed  to the  Partnership  by the  General  Partner
pursuant to Section  5.01(a)  (the  "Contributed  Assets")  exceeds the Adjusted
Basis of such assets at the time of their  contribution to the Partnership (such
excess being  referred to as the "Built-in  Gain").  The Adjusted  Basis of such
assets  shall be  determined  and agreed to between the General  Partner and the
Review  Committee (as defined in Section 7.11).  Without  limiting Section 6.07,
the  General  Partner  acknowledges  that it will be  required  to be  specially
allocated  income  of the  Partnership,  not  later  than the time at which  the
Contributed  Assets are  disposed  of by the  Partnership,  an amount of taxable
income  and gain equal to the lesser of (i) the  Built-in  Gain,  reduced by any
depreciation  and/or  amortization  deductions  with respect to the  Contributed
Assets  specially  allocated to Partners other than the General Partner pursuant
to  Section  704(c) of the Code,  the  Regulations  thereunder,  or  Regulations
sections 1.704-1(b)(2)(iv)(f),  1.704-1(b)(2)(iv)(g), or 1.704-1(b)(4)(i), which
special  allocation of  depreciation  and/or  amortization  shall be made to the
extent required by the Code and the Regulations  thereunder  notwithstanding any
provision  of this  Agreement,  or  (ii)  the  taxable  gain  recognized  by the
Partnership in connection with the disposition of the Contributed Assets.


                  6.08.  TAXES.

                         6.08(a) The General  Partner is authorized and directed
to cause the  Partnership  to withhold  from or pay on behalf of any Partner the
amount of federal, state, local or foreign taxes that the General Partner, after
consultation with such Partner,  reasonably believes the Partnership is required
to withhold or pay with respect to any amount distributable or allocable to such
Partner pursuant to this Agreement,  including,  without  limitation,  any taxes
required to be paid by the Partnership pursuant to sections 1441, 1442, 1445, or
1446 of the  Code  and any  taxes  imposed  by any  taxing  jurisdiction  on the
Partnership as an entity.  Without  limiting the foregoing,  the General Partner
shall  cause  the   Partnership  to  withhold  

                                      -26-
<PAGE>

(and remit to the appropriate  governmental  authority)  from amounts  otherwise
distributable  to a Partner  any taxes that such  Partner  notifies  the General
Partner in writing  should be  withheld,  which notice  shall  specifically  set
forth,  inter alia,  the rate at which tax should be  withheld  and the name and
address to which amounts withheld should be remitted.  Any amount paid on behalf
of a Partner  pursuant to this Section 6.08 (except to the extent  withheld from
an amount that otherwise would have been  distributed by the Partnership to such
Partner)  shall  constitute an advance by the  Partnership  to such Partner that
shall be secured by the Partner's  Partnership Interest. An advance to a Partner
pursuant to this Section 6.08(a) shall be repaid to the Partnership, in whole or
in part, as determined by the General Partner in its sole discretion, either (i)
out of any distributions from the Partnership which the Partner may be or become
entitled  to  receive,  or  (ii)  by the  Partner  in cash  upon  demand  by the
Partnership.  Any such advance  shall bear interest at the rate equal to two (2)
percentage points above the "Federal Short-Term Rate" as defined in Code section
1274(d)(1)(C)(i)  or the maximum rate permitted under applicable law,  whichever
is less, calculated upon the outstanding principal balance of such advance as of
the first day of each month.

                         6.08(b) The Partners agree to cooperate  fully with all
efforts of the  Partnership to comply with its tax  withholding  and information
reporting  obligations and to provide the Partnership  with such  information as
the General Partner may reasonably  request from time to time in connection with
such obligations.  Without limiting the foregoing, each Partner shall complete a
Certification of Non-foreign  Status (to the extent  applicable) in such form as
may be reasonably  requested by the General Partner (or shall provide such other
information  as the General  Partner  may  require) at the time that it executes
this Agreement, and each permitted transferee of a Partnership Interest pursuant
to Article X, whether or not such transferee is admitted to the Partnership as a
Partner,  shall complete such Certification at the time of its acquisition of an
interest  in  the  Partnership.   Any  Partner  or  permitted  transferee  of  a
Partnership  Interest  that  does not  provide  such a  Certification  with this
Section  6.08(b) shall be liable to the Partnership for the amount of any taxes,
penalties,  and interest for which the Partnership becomes liable as a result of
any such  failure,  provided  that the  foregoing  shall not relieve the General
Partner of  responsibility  for  withholding  (and remitting to the  appropriate
governmental  authority) from amounts  otherwise  distributable to a Partner any
amount that such Partner  specifically  notified the General Partner pursuant to
Section 6.08(a) should be so withheld and remitted.

                                      -27-

<PAGE>

                                   ARTICLE VII

                                   MANAGEMENT


                  7.01.  MANAGEMENT AND CONTROL OF PARTNERSHIP BUSINESS.

                         7.01(a)  Except  as  otherwise  expressly  provided  or
limited by the  provisions  of this  Agreement,  the General  Partner shall have
full,  exclusive,  and complete  discretion in the management and control of the
business and affairs of the  Partnership,  to make all  decisions  affecting the
business  and  affairs of the  Partnership,  and to take all such  actions as it
deems  necessary or appropriate to accomplish the purposes of the Partnership as
set forth herein. The General Partner shall use its best efforts to continue the
Partnership's  existence  for the term  specified  in Section  4.01  (unless the
Partnership is previously  dissolved or wound-up pursuant to this Agreement) and
to carry out the purposes of the  Partnership and shall devote to the management
of the  business and affairs of the  Partnership  such time as shall be required
for the  operation  thereof.  Except as  otherwise  expressly  set forth in this
Agreement, the Limited Partners shall not have any authority, right, or power to
bind  the  Partnership,  or to  manage  or  control,  or to  participate  in the
management or control of, the business and affairs of the Partnership.

                         7.01(b) The General  Partner shall be under a fiduciary
duty and  obligation  to  conduct  the  affairs of the  Partnership  in the best
interests  of the  Partnership  and  of  the  Limited  Partners,  including  the
safekeeping of all Partnership funds and assets (whether or not in the immediate
possession  or control  of the  General  Partner)  and the use  thereof  for the
exclusive benefit of the Partnership.

                         7.01(c) The General  Partner shall at all times conduct
its affairs and the affairs of the  Partnership in such a manner that no Limited
Partner or Affiliate of any Limited  Partner  shall have any personal  liability
with respect to any Partnership  indebtedness  (provided,  however, that nothing
herein  shall be  construed as  requiring  that the General  Partner  attempt to
control or  influence  the  conduct of any Limited  Partner  even if the General
Partner  believes  that actions of the Limited  Partner  would cause the Limited
Partner to have such personal liability). The General Partner shall use its best
efforts, in the conduct of the Partnership's  business, to put all suppliers and
other Persons with whom the Partnership does business on notice that the Limited
Partners and their  Affiliates are not liable for Partnership  obligations,  and
all agreements to which the  Partnership is a party shall include a statement to
the effect that the  Partnership is a limited  partnership  organized  under the
laws of Delaware.

                         7.01(d) The General  Partner shall use its best efforts
to assure that in  correspondence,  contracts,  agreements  and other  documents
relating to the Partnership (1) it shall plainly appear,  or be so stated,  that
the Partnership is a 

                                      -28-
<PAGE>

limited partnership  organized under the laws of Delaware,  (2) the full name of
the Partnership shall at all times be used and (3) wherever appropriate it shall
be expressly  stated  that,  for purposes of  determining  the  liability of the
Limited Partners, the laws of Delaware shall be controlling.

                         7.01(e) The General Partner shall cause the Partnership
to be  protected  by  adequate  public  liability,  property  damage  and  other
insurance, including insurance necessary to continue and conduct the business of
the Partnership in a reasonable and prudent manner.

                         7.01(f)  The  General  Partner  warrants  that  it will
maintain  in full force and effect the  Satellite  Authorizations.  The  General
Partner has assigned to the Partnership the FCC License,  and shall use its best
efforts to cause the  Partnership  to maintain the Satellite  Authorizations  in
full force and effect.

                         7.01(g) The General  Partner  shall take all  necessary
actions  to  (x)  successfully   assure  the  completion  of  the  International
Telecommunications  Union procedures with respect to other satellite systems for
all  Partnership  services  prior  to the  launch  of each of the  Partnership's
satellites as well as, at an appropriate time, for any other Partnership service
that may be proposed within the lifetime of such satellites,  and (y) obtain all
other Satellite Authorizations.

                         7.01(h) The General  Partner  shall take all  necessary
actions to enforce the provisions of the Satellite Construction Contract for the
benefit of the Partnership and all of the Partners  (subject to any requirements
set  forth  in  the  credit  documents  with  respect  to the  financing  of the
Partnership's proposed satellites).

                         7.01(i) The General  Partner  shall not,  either on its
own behalf or on behalf of the  Partnership,  enter into contracts or agreements
with any Person or Persons  which  conflict  with or  prejudice  in any material
respect  the  rights  of the  Limited  Partners  under  the  provisions  of this
Agreement,   the  Communications   Satellite  Capacity  Agreements,   Contingent
Communications  Satellite Capacity Agreements or Capacity Option Agreements,  or
any other  contract or  agreement  between the  Partnership  and a Partner,  and
warrants that it has not done so as of the date hereof.


                  7.02.  POWERS OF GENERAL PARTNER.

                  Subject  to the  limitations  of  Section  7.04 and any  other
express limitation on the authority of the General Partner set forth herein, the
General  Partner  (acting  on behalf of the  Partnership)  shall have the right,
power,  and  authority,  in the  management  of the  business and affairs of the
Partnership,  to do or cause to be done any and all acts,  at the expense of the
Partnership,  deemed by the General  Partner to be necessary or  appropriate  to
effectuate  the purposes of the  Partnership.  Subject to the provisions of this
Agreement,  all decisions made and 

                                      -29-
<PAGE>

actions  taken on behalf of the  Partnership  by the  General  Partner  shall be
binding upon the Partnership (provided,  however, that the powers of the General
Partner  shall not be construed as  permitting  the General  Partner to directly
bind any  Limited  Partner  in such  Limited  Partner's  capacity  as an  entity
separate from the  Partnership).  The power and authority of the General Partner
pursuant to this  Agreement  shall be liberally  construed to encompass all acts
and  activities  in which a limited  partnership  may engage  under the Delaware
RULPA.  The power and authority of the General  Partner shall  include,  without
limitation, the power and authority on behalf of the Partnership:

                         7.02(a) to do any acts or things  that the  Partnership
has power to do pursuant to Section 3.02;

                         7.02(b)  to  purchase  and  maintain,  in its  sole and
absolute discretion (subject to any obligation under Section 7.01(e) hereof) and
at  the  expense  of  the  Partnership,  liability,  indemnity,  and  any  other
insurance,  sufficient to protect the Partnership,  the General  Partner,  their
respective officers, directors,  employees, agents, and Affiliates, or any other
Person,  from those  liabilities and hazards which may be insured against in the
conduct of the  business and the  management  of the business and affairs of the
Partnership;

                         7.02(c) to make,  execute,  deliver,  perform,  assign,
acknowledge,  and file on behalf of the  Partnership  any and all  documents  or
instruments  of any  kind  which  the  General  Partner  may deem  necessary  or
appropriate in carrying out the purposes of the Partnership,  including, without
limitation, powers of attorney, agreements of indemnification,  sales contracts,
deeds, options, loan obligations,  mortgages,  deeds of trust, notes, documents,
or instruments of any kind or character,  and amendments thereto (and no person,
firm or  corporation  dealing  with the  General  Partner  shall be  required to
determine or inquire into the authority or power of the General  Partner to bind
the Partnership or to execute,  acknowledge, or deliver any and all documents in
connection therewith);

                         7.02(d) to possess and exercise any  additional  rights
and  powers  of a  general  partner  under  the  partnership  laws  of  Delaware
(including,  without  limitation,  the Delaware RULPA) and any other  applicable
laws, to the extent not inconsistent with this Agreement.


                  7.03.  POWER OF ATTORNEY.

                         7.03(a) In furtherance  of the  foregoing,  each of the
Limited Partners hereby irrevocably makes, constitutes and appoints and empowers
the General Partner, and the President,  any Vice President and the Treasurer of
the General Partner, and any successor of the General Partner as general partner
of the  Partnership  acting  singly or jointly,  in each case with full power of
substitution,  such Limited Partners true and lawful agent and  attorney-in-fact
to  negotiate,  

                                      -30-
<PAGE>

execute, acknowledge, deliver and file, on behalf of each such Limited Partners,
any and all of the following:

                           (i)  all  counterparts  of  this  Agreement,  and any
                  amendment or restatement  thereof,  including all certificates
                  and instruments,  which the General Partner deems  appropriate
                  to form,  qualify,  or continue the  Partnership  as a limited
                  partnership  (or a partnership  in which the Limited  Partners
                  will have limited liability comparable to that provided by the
                  Delaware RULPA) in the  jurisdictions in which the Partnership
                  may   conduct   business   or   in   which   such   formation,
                  qualification,  or  continuation  is,  in the  opinion  of the
                  General Partner, necessary or desirable to protect the limited
                  liability of the Limited Partners;

                           (ii) all  amendments  to this  Agreement  adopted  in
                  accordance  with Section 13.09 and all  instruments  which the
                  General  Partner  deems  appropriate  to  reflect  a change or
                  modification  of the  Agreement in  accordance  with the terms
                  hereof; or

                           (iii) all documents or instruments  which the General
                  Partner  deems  appropriate  to  reflect  the  admission  of a
                  Partner in accordance with this Agreement,  the dissolution of
                  the  Partnership  (including a certificate  of  cancellation),
                  sales or transfers of Partnership property, sales or transfers
                  of Partnership Interests, or the initial amount or increase or
                  reduction in amount of any Partner's  Capital  Contribution or
                  reduction in any Partner's  Capital Account in accordance with
                  the terms of this Agreement.

                         7.03(b) The appointment by all Limited  Partners of the
General Partner (and any successor General Partner), and the President, any Vice
President and the Treasurer of the General Partner as attorney-in-fact  shall be
deemed to be a power coupled with an interest,  in  recognition of the fact that
each of the Limited Partners under this Agreement will be relying upon the power
of the General  Partner to act as  contemplated  by this Agreement in any filing
and other action by it on behalf of the Partnership,  and shall survive, and not
be  affected  by  the  subsequent  bankruptcy,  death,  incapacity,  disability,
adjudication of  incompetence  or insanity,  or dissolution of any Person hereby
giving  such  power  and the  transfer  of all or any  part  of the  Partnership
Interest of such Person; provided, however, that in the event of the transfer by
a Limited Partner of all of such Limited  Partner's  Partnership  Interest,  the
foregoing power of attorney of a transferor  Partner shall survive such transfer
only  until  such  time  as the  transferee  shall  have  been  admitted  to the
Partnership  as a Limited  Partner and all required  documents  and  instruments
shall have been duly executed, filed, and recorded to effect such substitution.

                                      -31-
<PAGE>

                  7.04.  LIMITATION ON AUTHORITY OF GENERAL PARTNER.

                  Notwithstanding  anything in this  Agreement to the  contrary,
but subject to the provisions of Section  7.11(b)  herein,  the General  Partner
shall not,  without the prior written consent of the Limited  Partners holding a
majority of the total  Percentage  Interests then held by the Limited  Partners,
cause or permit the Partnership to:

                  (a)      dissolve and wind-up the affairs of the  Partnership,
                           except as provided in Article XII;

                  (b)      merge or  consolidate  with any other  partnership or
                           other entity;

                  (c)      sell,  assign,   lease  or  otherwise  dispose  of  a
                           material portion of the Partnership Assets other than
                           in the ordinary course of the Partnership's  business
                           (in   any    transaction   or   series   of   related
                           transactions);

                  (d)      cause the Partnership to incur (in any transaction or
                           series of related  transactions)  any indebtedness in
                           excess of $25 million;  provided,  however, that this
                           provision  shall not in any way  restrict the General
                           Partner's authority to cause the Partnership to incur
                           indebtedness in connection with the initial financing
                           (or refinancing in accordance  with Section  7.04(e))
                           of the Partnership's proposed satellite system;

                  (e)      cause   the   Partnership   to   refinance   (in  any
                           transaction  or series of related  transactions)  any
                           indebtedness  of the  Partnership  in  excess  of $50
                           million  other than on terms (taken as a whole) which
                           are no less  favorable  to the  Partnership  than the
                           terms  (taken as a whole) of the  indebtedness  being
                           refinanced;  in making the  determination  of whether
                           such terms are no less favorable to the  Partnership,
                           the General  Partner  may,  but shall not be required
                           to,      obtain      the      opinion      of      an
                           internationallyrecognized  investment  banker engaged
                           by the Partnership, which opinion shall be conclusive
                           for purposes of this subsection;

                  (f)      enter into a material agreement,  or use any material
                           portion of the Partnership Assets in a manner,  which
                           is  not   consistent   with  the   purposes   of  the
                           Partnership as set forth in Section 3.01; or

                  (g)      commingle  the funds or accounts  of the  Partnership
                           with any funds or accounts of the General  Partner or
                           any of its Affiliates.

                                      -32-
<PAGE>

                  7.05.  WORKING CAPITAL RESERVE.

                  The General  Partner  shall have the right to set up a Working
Capital Reserve and to set aside therein such  Partnership  funds as the General
Partner  determines to be  reasonable  in  connection  with the operation of the
business  of the  Partnership,  including,  without  limitation,  funds  for the
acquisition,  improvement,  development,  and  replacement of property,  for the
repayment  of loans and other  indebtedness,  for  security  deposits  and other
necessary  escrows and deposits,  and for meeting other  reasonably  anticipated
expenses.  The amount of funds set aside in the Working  Capital  Reserve during
any Fiscal Year shall not exceed the amount  provided in the Ten Year Projection
or most recent Approved  Budget,  as applicable,  as operating  expenses for the
immediately  following Fiscal Year. Any funds set aside for such Working Capital
Reserve may be invested by the General  Partner  with a view to the  appropriate
degree of safety of and return on such invested funds,  and such funds shall not
be available for current  distribution  under Section 6.04;  provided,  however,
some or all of such funds may  subsequently  be made available for  distribution
pursuant to Section  6.04 should the General  Partner,  in its sole and absolute
discretion, so elect.


                  7.06.  OTHER ACTIVITIES OF PARTNERS.

                  Except as otherwise provided is this Section 7.06, any Limited
Partner or Affiliate thereof may have other business  interests or may engage in
other  business  ventures  of any  nature  or  description  whatsoever,  whether
presently  existing  or  hereafter  created,   and  may  compete,   directly  or
indirectly, with the business of the Partnership.  The General Partner shall not
engage in any business other than  management of the business and affairs of the
Partnership without the prior written unanimous consent of the Limited Partners.
Neither  the General  Partner nor Orion  Network  Systems,  Inc.  may have other
business  interests  or may engage in other  business  ventures  which  compete,
directly or indirectly, with the business of the Partnership; provided, however,
that (i) this  provision  shall not prohibit  Orion Network  Systems,  Inc. from
having  business  interests  or  engaging  in  any  business  (x) in  which  the
Partnership is not then legally  permitted to engage or in which the Partnership
is not then able  technically  to engage,  or (y) which is  permitted by Section
7.07(x) to be engaged in by an Affiliate of the General Partner; and (ii) in the
event that a business  interest  of Orion  Network  Systems,  Inc. or a business
venture  in which it is  engaged  competes,  directly  or  indirectly,  with the
business of the Partnership as a result of the  Partnership  entering into a new
business or taking other  actions,  Orion Network  Systems,  Inc. shall offer to
sell such business  interest or its interest in such business  venture  within a
reasonable  period  of time to the  Partnership,  which,  at the  option  of the
Partnership,  pursuant to the  approval of an LP  Majority,  may  purchase  such
business  interest or interests in such business  venture,  at fair market value
(as determined by a mutually agreed appraiser). If the Partnership declines such
offer,  Orion  Network  Systems  shall  exercise  its best  efforts to sell such
business  interest or interests in such business venture to a third party,  and,
if it is unable to do so, may continue to hold such 

                                      -33-
<PAGE>


business  interest or engage in such  business  venture.  No Limited  Partner or
Affiliate  thereof shall incur any liability to the  Partnership  as a result of
such Limited Partner's or Affiliate's  pursuit of such other business  interest,
ventures  and  competitive  activity,  and  nothing in this  Agreement  shall be
construed  as  granting  the  Partnership  or the  other  Partners  any right to
participate in such other business ventures or to receive or share in any income
or profits derived therefrom.


                  7.07.  TRANSACTIONS WITH GENERAL PARTNER OR AFFILIATES.

                  The Partnership shall not be permitted in the normal course of
its  business to enter into  transactions  with the General  Partner or with any
Affiliate  of the General  Partner or with any  Affiliate of an Affiliate of the
General Partner  without the written consent of an LP Majority,  except that the
Partnership  shall be  permitted  to enter  into  (w)  Communications  Satellite
Capacity Agreements, Contingent Communications Satellite Capacity Agreements and
Capacity Option Agreements with any Affiliate of the General Partner,  (x) other
contracts,  agreements or transactions with any Affiliate of the General Partner
if each Limited Partner is or becomes, or has been or is offered the opportunity
to become,  a party to such contract,  agreement or transaction  (or a contract,
agreement or transaction  containing  substantially similar terms, including any
contract, agreement or transaction where the amounts of services, property, cash
or other  items to be  provided  to  Limited  Partners  are pro rata  based upon
Percentage  Interests),  (y)  contracts,  agreements  or  transactions  with any
Affiliate of the General  Partner  relating to the  provision of  management  or
similar  support by such  Affiliate to the General  Partner within the limits of
the then-applicable budget of the Partnership,  to the extent that the provision
of such services by the Affiliate does not conflict with the duty of the General
Partner to directly  manage the affairs of the  Partnership,  and (z) contracts,
agreements or transactions with any Affiliate of the General Partner relating to
the provision of marketing or sales representation or operations services within
the United States.


                  7.08.  LIABILITY  OF  GENERAL   PARTNER  AND   AFFILIATES   TO
                         PARTNERSHIP AND LIMITED PARTNERS.

                  Except  as  otherwise  expressly  agreed  in  writing  by  the
Partners,  neither the General  Partner  nor any of its  Affiliates,  nor any of
their respective partners, officers,  directors,  employees, or agents, shall be
liable to the Partnership or to the Limited Partners for any losses sustained or
liabilities  incurred as a result of any act or omission of any of such Persons,
so long as the conduct of such Person did not constitute bad faith, fraud, gross
negligence,   willful   misconduct  or  breach  of  fiduciary  duty  (either  as
interpreted under Delaware law, this Agreement or any other contract between the
Partnership and Limited Partners generally).


                                      -34-
<PAGE>


                  7.09.  INDEMNIFICATION   OF  GENERAL   PARTNER   AND   LIMITED
                         PARTNERS.

                         7.09(a)  The  Partnership   shall  indemnify  and  hold
harmless the General Partner and its Affiliates and their  respective  partners,
officers,  directors,  employees  and agents  (individually,  in each  case,  an
"Indemnitee")  to the fullest  extent  permitted by law from and against any and
all losses,  claims,  demands,  costs, damages,  liabilities (joint or several),
expenses of any nature (including attorneys' fees and disbursements), judgments,
fines, settlements,  and other amounts arising from any and all claims, demands,
actions,  suits,  or proceedings,  whether civil,  criminal,  administrative  or
investigative,  in which the  Indemnitee  may be  involved or  threatened  to be
involved as a party or  otherwise,  arising out of or incidental to the business
or  activities  of or relating  to the  Partnership,  regardless  of whether the
Indemnitee continues to be the General Partner or an Affiliate thereof or one of
their respective partners, officers, directors, employees and agents at the time
any  such   liability  or  expense  is  paid  or  incurred,   if  (x)  a  final,
non-appealable  judgment favorable to the Indemnitee(s) is entered in a court of
competent  jurisdiction,  or (y) pursuant to a request by any Limited Partner or
the General  Partner  for such a  determination  by an  Independent  Party,  the
Independent Party determines with regard to the Indemnitee's  conduct which gave
rise to or resulted in any actual or threatened action, case, complaint or other
proceeding  which  was  the  subject  of  a  final  settlement,   that  had  the
Indemnitee(s)  not  settled  the  dispute at issue,  they would have  received a
final, non-appealable judgment in their favor.

                         7.09(b) Expenses incurred by an Indemnitee in defending
any claim,  demand,  action,  suit, or proceeding  subject to this Section 7.09,
other than any such  proceeding in which any claim is made by a Limited  Partner
against  the  Indemnitee,  shall,  from  time to time  and upon  request  by the
Indemnitee,  be advanced by the  Partnership  prior to the final  disposition of
such claim, demand, action, suit, or proceeding, upon receipt by the Partnership
of an  undertaking  by or on  behalf  of the  Indemnitee  to repay  such  amount
promptly,  with  interest  calculated  at the rate  equal to two (2)  percentage
points   above  the   "Federal   Short-Term   Rate"  as   defined  in  Code  ss.
1274(d)(1)(C)(i)  or the maximum rate permitted under applicable law,  whichever
is less, calculated upon the outstanding principal balance of such amount, if it
shall be determined in a judicial  proceeding or a binding arbitration or by the
Independent  Party  pursuant  to Section  7.09(a)  that such  Indemnitee  is not
entitled to be indemnified as authorized in this Section 7.09. In the event that
an  Indemnitee  does not  receive  from the  Partnership  advances  on  expenses
pursuant to this  Section  7.09(b)  because a Limited  Partner  asserted a claim
against  the  Indemnitee  in the  proceeding  at issue,  and the  Indemnitee  is
entitled to indemnification  pursuant to Section 7.09(a),  the Partnership shall
reimburse the Indemnitee for all expenses  incurred in defending the proceeding,
plus interest at the rate equal to two (2) percentage  points above the "Federal
Short-Term  Rate" as defined in Code ss.  1274(d)(1)(C)(i),  or the maximum rate
permitted under applicable law, whichever is less.

                                      -35-

<PAGE>

                         7.09(c) The  indemnification  provided by this  Section
7.09 shall be in  addition  to any other  rights to which an  Indemnitee  may be
entitled  under  any  agreement,  vote of the  Partners,  as a matter  of law or
equity, or otherwise,  both as to an action in the Indemnitee's  capacity as the
General  Partner  or an  Affiliate  thereof,  and  as to an  action  in  another
capacity, and shall continue as to an Indemnitee who has ceased to serve in such
capacity and shall inure to the benefit of the heirs,  successors,  assigns, and
administrators of the Indemnitee.

                         7.09(d) An  Indemnitee  pursuant to this  Section  7.09
shall not be denied  indemnification in whole or in part under this Section 7.09
or  otherwise by reason of the fact that the  Indemnitee  had an interest in the
transaction with respect to which the indemnification applies if the transaction
was  otherwise  permitted  or not  expressly  prohibited  by the  terms  of this
Agreement.

                         7.09(e) The General  Partner  including its  Affiliates
(other than any  executive  officer or director  of the General  Partner)  shall
fully indemnify and hold harmless the Limited  Partners and their Affiliates and
their  respective  partners,  officers,  directors,  employees and agents to the
fullest  extent  permitted  by law from and against any and all losses,  claims,
demands, costs, damages,  liabilities (joint or several), expenses of any nature
(including attorneys' fees and disbursements),  judgments,  fines,  settlements,
and other  amounts  including,  but not limited to,  those  arising  directly or
indirectly  from  or  relating  to  any  civil,   criminal,   administrative  or
investigative proceeding, arising out of or incidental to conduct by the General
Partner or one of its  Affiliates  with respect to the business or activities of
or  relating  to the  Partnership  which  constituted  fraud,  bad faith,  gross
negligence,   willful   misconduct  or  breach  of  fiduciary  duty  (either  as
interpreted under Delaware law, this Agreement or any other contract between the
Partnership and Limited Partners generally).

                         7.09(f) The provisions of this Section 7.09 are for the
benefit of the indemnitees as set forth herein and shall not be deemed to create
any rights for the benefit of any other Persons.


                  7.10.  NO MANAGEMENT BY LIMITED PARTNERS.

                         7.10(a)  No  Limited  Partner  shall  take  part in the
day-to-day  management,  operation or control of the business and affairs of the
Partnership or have any right, power, or authority to act for or on behalf of or
to bind the Partnership or transact any business in the name of the Partnership.
In the event any laws, rules or regulations applicable to the Partnership, or to
its sale or issuance of interests in the Partnership, require a Limited Partner,
or any group or class thereof,  to have certain rights,  options,  privileges or
consents not granted by the terms of this Agreement,  then such Limited Partners
shall have and enjoy such rights,  options,  privileges  and consents so long as
(but only so long as) the  existence  thereof  does not  result in a loss of the
limitation on liability enjoyed by the Limited 

                                      -36-
<PAGE>

Partners  under  the  Delaware  RULPA  or  the  applicable  laws  of  any  other
jurisdiction.

                         7.10(b) No Limited  Partner  (if not a natural  person,
its  directors,  officers,  partners,  etc.)  shall  act as an  employee  of the
Partnership if such Limited Partner's functions,  directly or indirectly, relate
to the Partnership's international communications satellite facilities.

                         7.10(c) No Limited Partner shall serve, in any material
capacity,  as an independent  contractor or agent with respect to the management
or  operation  of  the  Partnership's  international   communications  satellite
facilities  (except with regard to tracking,  telemetry  and command and related
services).

                         7.10(d) No Limited Partner shall  communicate  with the
General  Partner on  matters  pertaining  to the  day-to-day  operations  of the
Partnership's international communications satellite facilities.

                         7.10(e) No Limited  Partner  shall perform any services
to the  Partnership  materially  relating to the  management or operation of the
Partnership's  international   communications  satellite  facilities,  with  the
exception of making loans to, or acting as a surety for, the Partnership.

                         7.10(f)  No  Limited   Partner  shall  become  actively
involved in the  management  or  operation  of the  Partnership's  international
communications satellite facilities.

                         7.10(g)  The  General  Partner  may  contract  with any
Limited  Partner or any  Affiliate  of any  Limited  Partner for any purpose not
otherwise restricted by this Agreement,  in particular for provision of customer
support,  marketing  and  related  services  with  respect  to the  sale  of the
Partnership's  international  communications  satellite  facilities;   provided,
however,  that  any such  activity  undertaken  by a  Limited  Partner  shall be
pursuant to  independently-executed  agreements  which shall be non-exclusive in
nature  and  under  which  any  sales to the  Partnership's  customers  shall be
governed by contractual terms and conditions set by the General Partner.


                  7.11.  PARTNERS PLANNING AND POLICY REVIEW COMMITTEE.

                         7.11(a) A  committee  of the  Partnership  known as the
Partners  Planning  and  Policy  Review  Committee  (the  "Review   Committee"),
consisting of one  representative of each Partner,  shall be established for the
purposes set forth in Section 7.11(b). Review Committee representatives shall be
entitled to bring to Review  Committee  meetings such staff and other  personnel
which they reasonably deem  necessary.  The Review  Committee shall meet at such
times, dates and places as the General Partner may deem appropriate. Meetings of
the Review  Committee may be called by the General Partner from time to time and
shall be called by the 

                                      -37-
<PAGE>

General  Partner upon its receipt of a request in writing signed by at least two
Limited Partners holding in the aggregate at least [twenty percent (20%)] of the
total  Percentage  Interests  then held by the Limited  Partners,  which request
shall  specify the purpose of such a meeting.  Notification  of a meeting of the
Review  Committee  shall be sent by the General  Partner,  not less than fifteen
(15)  days  prior to the date of such  meeting,  to the  representatives  of the
Limited  Partners at their record addresses (as may be changed by written notice
to the General  Partner) and shall specify the time,  date, place and purpose of
such meeting.  Notification  of a meeting called at the request of the requisite
number of Limited Partners shall be sent within ten (10) business days after the
General  Partner's  receipt of such a request and such meeting shall be held not
less than  fifteen  (15) nor more than  thirty  (30) days after  receipt of such
request.  The members of the Review  Committee may designate one of such members
as chairman of the Review  Committee and may establish such other procedures for
the functioning of the Review  Committee as the members of the Review  Committee
may approve, subject to the requirements and approval procedures of this Section
7.11. Voting of the  representatives of the Limited Partners may be in person or
by proxy,  duly signed by the  representatives  of the Limited Partners or their
respective  attorneys-in-fact.  All actions  that could be taken at a meeting of
the  Review  Committee  may  also  be  taken  by  the  written  consent  of  the
representatives  of Limited  Partners  holding such  Percentage  Interests as is
required to take such action pursuant to this Section 7.11.

                         7.11(b) The General  Partner shall submit the following
actions to the Review Committee which, by vote of the  representatives  of an LP
Majority (except as set forth below in Section  13.09(e)),  which shall have the
right to approve or disapprove of any such actions:

                           (i)  Establishment  of any standard  pricing policies
                  with respect to the  Partnership's  sale of services which are
                  intended to result in (x) the sale of  satellite  transmission
                  capacity to customers generally at prices which are lower than
                  those charged to Limited  Partners in agreements  entered into
                  on or  about  the  date of this  Agreement  or (y) the sale of
                  satellite  transmission capacity to certain Partners at prices
                  or on terms  materially  different  from the  prices and terms
                  offered or available to Partners generally.

                           (ii)  Establishment of any amended budget pursuant to
                  Section 9.09(c) or establishment of any budget relating to any
                  period  of one year or longer  (including  any  annual  budget
                  proposed  by  the  General  Partner  under  Section  9.09)  (a
                  "Proposed Budget") which calls for a percentage increase, from
                  the  applicable  amount  specified,  for the year to which the
                  Proposed Budget relates, in the Ten Year Projection dated July
                  12,  1991  (the  "Ten Year  Projection")  (attached  hereto as
                  Exhibit A) in (x) an aggregate  annual amount of 10 percent or
                  more,  or (y) any  individual  line item  annual  amount of 20
                  percent or more; provided, 

                                      -38-
<PAGE>

                  however,  that if under this Section  7.11(b)(ii)  and Section
                  13.09(e),  a budget is  approved  which  covers  the period to
                  which the Proposed Budget relates (an "Approved Budget"),  the
                  percentage  increase in aggregate annual operating expenses or
                  in  individual  line items shall be  measured  from the amount
                  specified in the most recent Approved Budget, rather than from
                  the applicable amount in the Ten Year Projection.

                           (iii) Causing the Partnership to make expenditures or
                  incur  obligations  in excess of those  permitted  by  Section
                  9.09(c).

                           (iv)  Settlement of any matters with federal,  state,
                  local or foreign tax authorities that requires the payment by,
                  or the increase in tax  liabilities of, either the Partnership
                  or the Partners in the  aggregate in excess of $3 million,  or
                  consent  to  an  extension  of  the  statute  of   limitations
                  applicable to the  assessment and collection of taxes from the
                  Partners in  connection  with any federal or state  income tax
                  audit of the  Partnership  involving a potential tax liability
                  for the Partners in the aggregate in excess of $3 million.

                           (v)  Characterization   (including  determination  of
                  source and whether  such item should be  separately  stated by
                  the Partners in their respective  returns) of major categories
                  of  income,  gain,  deduction,  and loss for  purposes  of the
                  Partnership's  federal  income tax returns,  provided that any
                  characterization  determined by the Review Committee  pursuant
                  to  this  Section  7.11(b)(v)  shall  be used  in  filing  the
                  Partnership's   returns   only   if  the   Partnership's   tax
                  accountants or tax counsel determine that there is a realistic
                  possibility  (within the meaning of section  6694 of the Code)
                  of such  characterization  being  sustained  on its merits and
                  that  either  there is  "substantial  authority"  (within  the
                  meaning of section 6662 of the Code) for such characterization
                  or  there  is  adequate   disclosure  of  the  relevant  facts
                  affecting such characterization in the Partnership's return so
                  that the penalties  applicable  under  section  6662(c) of the
                  Code would not apply to the  Partnership  or the  Partners  if
                  such  characterization  were not  sustained.  For the purposes
                  hereof,  a "major  category" shall mean an amount in excess of
                  $1,000,000 for the particular taxable year at issue.

                           (vi)  Offering  to sell  any  additional  Partnership
                  Interest pursuant to the terms of Section 11.01.

                           (vii)  Designation by the General Partner of a member
                  of its  executive  management  to be the  general  manager  to
                  direct the  management of IPSP Services (as defined in Section
                  7.14(c)).

                           7.11(c) Any action  required to be  submitted  by the
General Partner to the Review  Committee  pursuant to this Section 7.11 shall be
submitted  

                                      -39-
<PAGE>

by written notice to the Limited Partners (the "Review  Notice"),  together with
the notice concerning the meeting and a description of the action(s) proposed to
be taken at the meeting.

                           7.11(d) At each meeting of the Review Committee,  the
General  Partner  shall  report  to the  members  of  the  Review  Committee  on
significant developments of IPSP Services (as defined in Section 7.14(c)) during
the period  since the  preceding  meeting of the Review  Committee.  Such report
shall be in such form as the  General  Partner may deem  appropriate,  but shall
include information concerning the execution of the business plan, including the
strategy  for  market  entry,  the  development  of service  offerings,  and the
appointment or removal of representative agents and distributors,  the terms and
conditions  of any such  appointment,  the relation of any such  appointment  to
existing agreements and the grounds for any such removal. In addition,  when the
General  Partner  prepares and  presents the annual  budget (or any other Budget
Subject to Approval) to the members of the Review Committee, the General Partner
shall  present  to members of the Review  Committee  the work  program  for IPSP
Services as it is reflected in the budget.


                  7.12.  MEETINGS OF LIMITED PARTNERS.

                  Meetings of the Limited  Partners  regarding  any matters with
respect to which the Limited  Partners have the right to vote or consent  (other
than pursuant to Section 7.11) may be called by the General Partner from time to
time and shall be called by the General Partner upon its receipt of a request in
writing  signed by at least two Limited  Partners  holding in the  aggregate  at
least twenty  percent (20%) of the total  Percentage  Interests then held by the
Limited  Partners,  which  request  shall specify the purpose of such a meeting.
Notification  of a meeting of the Limited  Partners shall be sent by the General
Partner,  not less than fifteen (15) days prior to the date of such meeting,  to
the Limited  Partners at their  record  addresses  (as may be changed by written
notice to the  General  Partner)  and shall  specify the time,  date,  place and
purpose of such meeting.  Notification of a meeting called at the request of the
requisite number of Limited Partners shall be sent within ten (10) business days
after the General Partner's receipt of such a request and shall be held not less
than fifteen (15) nor more than sixty (60) days after  receipt of such  request.
Any  meeting  of Limited  Partners  may be held at the  principal  office of the
Partnership  or  at  such  other  location  as  the  General  Partner  may  deem
appropriate.  Voting of the Limited Partners may be in person or by proxy,  duly
signed by the Limited Partner or its attorney-in-fact. All actions that could be
taken at a meeting  of the  Limited  Partners  may also be taken by the  written
consent of Limited Partners holding such Percentage  Interests as is required to
take such action pursuant to this Agreement.

                                      -40-

<PAGE>

                 7.13.   TRANSFER OF LIMITED PARTNERSHIP INTEREST TO THE GENERAL
                         PARTNER.

                  In the  event  that the  Percentage  Interest  of the  General
Partner is ever less than twenty five percent (25%) or in the event that Limited
Partners of the  Partnership  ever own, in the aggregate,  more than twenty five
percent (25%) of the voting power with respect to the outstanding stock of Orion
Network  Systems,  Inc.  ("ONS"),  determined  based  upon  the  higher  of  the
percentage  of votes  that  can be cast for the  election  of  directors  or the
percentage of directors that can be selected,  ONS shall transfer to the General
Partner any interest as a Limited Partner that ONS then owns in the Partnership,
and the General Partner shall  thereafter have, in addition to all of its rights
under  this  Agreement  as a  General  Partner,  all of the  rights of a Limited
Partner under this Agreement attributable to such interest.


                  7.14.  TECHNICAL COMMITTEE.

                         7.14(a) A  committee  of the  Partnership  known as the
Technical   Committee   (the   "Technical   Committee"),   consisting   of   one
representative   (and,  if  requested  by  a  Limited   Partner,   an  alternate
representative) of each Partner, shall be established for the purposes set forth
in Section 7.14(b).  Technical  Committee  representatives  shall be entitled to
bring to Technical  Committee meetings such staff and other personnel which they
reasonably deem necessary.  Meetings of the Technical Committee may be called by
the  General  Partner  from time to time,  and  shall be  called by the  General
Partner upon its receipt of a request in writing  signed by at least two Limited
Partners,   which   request  shall  specify  the  purpose  of  such  a  meeting.
Notification  of a  meeting  of the  Technical  Committee  shall  be sent by the
General  Partner,  not less than  fifteen  (15)  days  prior to the date of such
meeting,  to the  representatives  of  the  Limited  Partners  at  their  record
addresses (as may be changed by written notice to the General Partner) and shall
specify the time,  date,  place and purpose of such meeting.  Notification  of a
meeting called at the request of the requisite  number of Limited Partners shall
be sent within ten (10)  business  days after the General  Partner's  receipt of
such a request and such  meeting  shall be held not less than  fifteen  (15) nor
more than thirty (30) days after  receipt of such request.  The General  Partner
shall serve as chairman of the Technical Committee. The members of the Technical
Committee may establish  such  procedures  for the  functioning of the Technical
Committee as the members of the Technical Committee may approve,  subject to the
requirements  and approval  procedures  of this Section  7.14.  If any matter is
submitted to the Technical Committee at a meeting of the Technical Committee for
that Committee's  advice  concerning such matter (whether by the General Partner
or upon  receipt by the  General  Partner  of a request in writing  signed by at
least two Limited Partners), such matter shall be submitted by written notice to
the Limited  Partners,  together  with the notice  concerning  the meeting and a
description of the matter on which advice is to be given at the meeting.

                                      -41-
<PAGE>

                         7.14(b) The Technical Committee will advise the General
Partner and the Review  Committee on all matters  relating to the technology and
operation of the Partnership's  satellite system and transmission  networks. The
Technical  Committee  also will review and recommend to the General  Partner and
the Limited  Partners the final and definitive  main  technical and  performance
specifications  for the  Partnership's  satellites,  as well as of any  material
amendment thereof during the construction  period. With regard to IPSP Services,
the Technical  Committee  will recommend  technical  standards for equipment and
operations and will seek to ensure that any such  standards are consistent  with
the operating  standards and procedures of the satellite  system.  The Technical
Committee  will  review  the  technical  aspects  of  any  general  policies  or
procedures  proposed by the General Partner  regarding IPSP Services;  provided,
however, that the Technical Committee shall not have the power to disapprove any
action taken by the General  Partner or the Review  Committee.  If the Technical
Committee does not reach a unanimous conclusion  concerning particular advice to
be given to the General Partner or the Review  Committee,  only matters approved
by the representatives of an LP Majority shall be deemed to be the advice of the
Technical  Committee;  provided,  however,  that  the  report  of the  Technical
Committee which contains such advice also shall set forth any advice provided by
the  representatives  of any Limited  Partner not  included in such LP Majority.
Unless all representatives on the Technical Committee otherwise agree, advice by
the Technical Committee shall be in writing.

                         7.14(c)  "IPSP  Services"   means:   transmission-based
telecommunication  services  (other  than  the  mere  sale or  lease of units of
transmission  capacity on the  Partnership's  satellite system) which consist of
international  private  transmission  links  and  networks,  either  as  turnkey
facilities management or as a service, and in particular include (i) any and all
transmission   services   provided  by  the   Partnership   primarily  over  the
Partnership's  satellite  system that involve the transport of information,  but
not  its  manipulation,  and  satellite  connectivity  services,  and  (ii)  the
provision of, installation,  maintenance,  repair,  operation,  customer network
support and monitoring for, and associated services related to ground facilities
used  to  communicate  to or  from  the  satellite  system,  including  (without
limitation),  turnkey facilities management,  VSAT and hub/control earth station
services and  terrestrial  links,  and (iii) Value Added  Services,  which means
those services which involve not simply the transmission of information, but its
manipulation as well.

                  Any   non-public   switched   telecommunications   network  or
international  transmission  service  (other  than  the  mere  sale or  lease of
transmission  capacity on the Partnership's  satellite system) is intended to be
included in IPSP Services.

                                      -42-

<PAGE>

                                  ARTICLE VIII

             COMPENSATION OF GENERAL PARTNER; PAYMENT OF PARTNERSHIP
                                    EXPENSES


                  8.01.  COMPENSATION OF GENERAL PARTNER.

                  Except as  expressly  provided in Section  8.03 or pursuant to
arrangements contemplated by Section 7.07, the General Partner shall not receive
any compensation from the Partnership for services rendered in its capacity as a
general partner of the Partnership.


                  8.02.  PARTNERSHIP EXPENSES.

                  Subject to  Section  7.11(b)(iii),  notwithstanding  any other
provision of this Agreement,  the Partnership shall bear all costs and expenses,
including,  without  limitation,  all costs  and  expenses  (including  overhead
expenses)  reasonably  incurred by the General  Partner in  connection  with the
management and operation of the business and affairs of the  Partnership,  or in
carrying  out the  purposes  of the  Partnership.  In the event that the General
Partner at any time or from time to time  advances its own funds to pay any such
costs or expenses,  it shall be entitled to reimbursement of such funds from the
Partnership promptly upon demand.


                  8.03.  Acquisition, Organizational, and Offering Expenses.
                  The  Partnership  shall  reimburse the General Partner for all
fees,  costs,  and  expenses  actually  incurred by the General  Partner and its
Affiliates in connection with the organization of the Partnership,  the offering
and sale of Partnership Interests to the Limited Partners,  and the arrangements
for the placement of Partnership debt, and including,  without limitation, legal
(including tax advice),  financial  advisor,  consulting  and  accounting  fees,
filing and recordation fees, printing costs, telephone and travel expenses.


                                   ARTICLE IX

              BANK ACCOUNTS; BOOKS AND RECORDS; STATEMENTS; TAXES;
                           FISCAL YEAR; ANNUAL BUDGET


                  9.01.  BANK ACCOUNTS AND INVESTMENTS.

                  All funds of the Partnership shall be deposited in its name in
such checking and savings accounts, time deposits or certificates of deposit, or
other accounts at such banks or in such other  investments  permitted by Section
3.02(h),  as shall be designated by the General  Partner from time to time,  and
the General Partner shall arrange for the appropriate management of such account
or accounts.

                                      -43-
<PAGE>

                  9.02.  BOOKS AND RECORDS.

                  The General Partner shall keep, or cause to be kept, books and
accounts showing assets, liabilities,  income, operations,  transactions and the
financial  condition  of the  Partnership.  Such  books  and  accounts  shall be
prepared  on the  accrual  basis for  accounting  and U.S.  federal  income  tax
purposes and in accordance with generally accepted accounting  principles unless
the General  Partner adopts an alternative  basis in accordance  with applicable
accounting  and  tax  standards.  The  Limited  Partners,  or  their  respective
designees,  shall have access to the books and records of the  Partnership  with
respect to all information which the Limited Partners are lawfully  permitted to
require,  including but not limited to budgets,  financial  projections  and any
amendment thereto, quarterly and annual income statements,  quarterly and annual
balance sheets,  quarterly and annual funds flow  statements and forecasts,  the
credit  documents  with respect to the financing of the  Partnership's  proposed
satellites,  and the Satellite  Construction  Contract (other than trade secrets
and other proprietary information,  or any information of any kind received from
third parties pursuant to a  confidentiality  agreement or understanding) at any
reasonable  time during regular  business hours and shall have the right to copy
said records at their expense.


                  9.03.  FINANCIAL STATEMENTS AND INFORMATION.

                         9.03(a) All financial  statements  prepared pursuant to
this Section 9.03 shall present fairly, in all material respects,  the financial
position and operating  results of the  Partnership in accordance with generally
accepted accounting  principles,  and shall be prepared on the accrual,  cash or
other  basis,  as  provided  in  Section  9.02,  for  each  Fiscal  Year  of the
Partnership during the term of this Agreement.

                         9.03(b)  Within  forty-five  (45) days after the end of
each  quarterly  period (the "Fiscal  Quarter") of each Fiscal Year,  commencing
with the first full Fiscal Quarter after December 20, 1991, the General  Partner
shall  prepare and submit or cause to be prepared  and  submitted to the Limited
Partners an unaudited  statement of profit and loss for the Partnership for such
Fiscal Quarter and an unaudited balance sheet of the Partnership dated as of the
end of such Fiscal  Quarter,  in each case prepared in accordance with generally
accepted accounting principles.

                         9.03(c)  Within  ninety (90) days after the end of each
Fiscal  Year,  the  General  Partner  shall  prepare  and  submit or cause to be
prepared and  submitted to the Limited  Partners (i) an audited  balance  sheet,
together  with  audited  statements  of profit  and loss,  Partners'  equity and
changes in financial  position for the  Partnership  during such Fiscal Year and
(ii) an  audited  statement  showing  any Cash  Flow and any Net  Proceeds  of a
Capital Transaction distributed to the Partners in respect of such Fiscal Year.

                                      -44-
<PAGE>

                         9.03(d) At least ten (10) days prior to each meeting of
the Review  Committee,  the General Partner shall prepare and submit or cause to
be  prepared  and  submitted  to the  members of the Review  Committee a general
report on significant  developments of or affecting the  Partnership  during the
period since the most recent prior meeting of the Review Committee.  Such report
shall be in such form as the General Partner may deem appropriate.

                         9.03(e)  The  General  Partner  shall  provide  to  the
Limited Partners such other reports and information  concerning the business and
affairs of the  Partnership  as may be required by the Delaware  RULPA or by any
other law or regulation of any regulatory  body  applicable to the  Partnership.
Nothing in this  Agreement  shall  restrict the right of any Limited  Partner to
communicate  with the General  Partner on matters  pertaining to general policy,
planning  and  direction to the extent  permitted by Section  17-303 of Delaware
RULPA.

                         9.03(f)  Within  forty-five  (45) days after the end of
each  Fiscal  Quarter,  commencing  with the first  full  Fiscal  Quarter  after
December 20, 1991,  until  commencement of commercial  operations of each of the
Partnership's satellites,  the General Partner shall prepare and submit or cause
to be prepared and submitted to the Limited Partners  progress reports regarding
the construction and launch of the Partnership's  proposed  satellites under the
Satellite  Construction  Contract  in such form as will  reasonably  inform  the
Limited  Partners about the matters set forth below.  Such reports shall include
reports  from  the  manufacturer  under  the  Satellite   Construction  Contract
regarding the status of the construction,  from the launch services company that
will perform launch services for such manufacturer  regarding the launch status,
and from the Partnership  regarding  regulatory  matters (including those of any
state,  governmental commission (including the FCC) or other authority affecting
the construction, launch or operation of the satellites). Within forty-five (45)
days after the end of each Fiscal Quarter, commencing with the first full Fiscal
Quarter  after the  commencement  of  commercial  operations of the first of the
Partnership's satellites,  the General Partner shall prepare and submit or cause
to be prepared and submitted to the Limited  Partners  status reports  regarding
the health of the  Partnership's  satellites  and all  transponders,  the use of
transponder  spares,  updated  predictions  regarding  satellite  life, and full
information about any effected transfer or lease of capacity  (including name of
user, bandwidth, price, duration and transponder occupancy). The General Partner
shall  inform each Limited  Partner in writing  about any event which has or may
have a material  adverse  effect on the health or the  performance of any of the
Partnership's satellite promptly after occurrence of such event.

                         9.03(g) The provision by the General  Partner to one or
more  Limited  Partners of reports or  information  described in Section 9.03 or
otherwise pursuant to this Agreement,  by itself,  shall not imply in any manner
whatsoever the acceptance by or involvement of any Limited  Partner with respect
to such  reports  or  information,  and such  reports  or  information  shall be
construed only as having been prepared and distributed by the General Partner.

                                      -45-
<PAGE>

                  9.04.  ACCOUNTING DECISIONS.

                  All decisions as to accounting matters, except as specifically
provided to the contrary herein, shall be made by the General Partner.


                  9.05.  WHERE MAINTAINED.

                  The books,  accounts  and  records of the  Partnership  at all
times shall be maintained at the Partnership's  principal office as set forth in
Section 2.03 above, or, at the option of the General  Partner,  at the principal
place of business of the General Partner.


                  9.06.  TAX RETURNS AND TAX MATTERS.

                         9.06(a) The General  Partner  shall,  at the expense of
the Partnership, cause to be prepared and delivered to the Partners, in a timely
fashion after the end of each Fiscal Year, copies of all Federal,  state, local,
and foreign  income tax returns for the  Partnership  for such Fiscal Year,  one
copy of which  shall be filed by the  General  Partner.  Such  returns  shall be
prepared on the accrual  basis (or as otherwise  determined  pursuant to Section
9.02) and shall accurately  reflect the results of operations of the Partnership
for such Fiscal  Year.  The General  Partner is  designated  as the "tax matters
partner"  (as  defined in the Code) of the  Partnership  and is  authorized  and
required to  represent  the  Partnership  (at the  expense of the  Partnership),
subject to Section  7.11(b)(iv),  in  connection  with all  examinations  of the
affairs of the  Partnership  by any Federal,  state,  or local tax  authorities,
including any resulting  administrative and judicial proceedings,  and to expend
funds  of  the  Partnership  for  professional  services  and  costs  associated
therewith.  Each Partner agrees to cooperate with the General  Partner and to do
or refrain  from  doing any or all things  reasonably  required  by the  General
Partner in connection with the conduct of such proceedings;  provided,  however,
that in no event  shall any Limited  Partner be  required to do or refrain  from
doing  anything  which would cause such  Limited  Partner to be deemed a general
partner of the Partnership.

                         9.06(b)  Upon  receipt  by the  General  Partner of any
notice,  request,  inquiry,  or statement  of a material  nature from the IRS in
connection with an examination of the Partnership  involving a potential federal
income  tax  liability  for the  Partners,  in the  aggregate,  in  excess of $3
million, the General Partner shall within 20 days send all other Partners a copy
of the  documents so  received.  In the event that  General  Partner  intends to
respond in writing to any documents  from the IRS required to be provided to the
other Partners under the preceding sentence, (i) if the potential federal income
tax liability  for the  Partners,  in the  aggregate,  exceeds $10 million,  the
General  Partner  shall  provide a copy of its  proposed  response  to all other
Partners  not less than 10 days before such  response is to be  submitted to the
IRS and shall  consider in good faith any comments  received from other Partners
with respect to such proposed response, and (ii) if the potential 

                                      -46-
<PAGE>

federal income tax liability for the Partners,  in the aggregate is greater than
$3 million,  the General  Partner shall provide a copy of its actual response to
all other Partners promptly after submission to the IRS.

                         9.06(c)  The  General  Partner,  at the  expense of the
Partnership  shall provide Limited Partners with such other  information as they
may reasonably request for use in the preparation of their respective income tax
returns.


                  9.07.  FEDERAL INCOME TAX ELECTIONS.

                  If there is a distribution of any Partnership  Assets or other
property as described  in Section 734 of the Code,  or if there is a transfer of
an interest in the  Partnership  as described in Section 743 of the Code,  then,
upon the request of any Partner, the General Partner shall cause the Partnership
to file a Section 754 Election,  provided the Partner  requesting  such election
shall have agreed in writing to reimburse the  Partnership  for all  incremental
accounting and other administrative costs incurred as a result of such election.


                  9.08.  FISCAL YEAR.

                  The Fiscal Year of the  Partnership for financial and Federal,
state and local income tax purposes  shall  initially be the calendar  year. The
General Partner shall have authority to change the beginning and ending dates of
the Fiscal Year if the General  Partner,  in its sole and  absolute  discretion,
deems  such  change  to be  necessary  or  appropriate  to the  business  of the
Partnership,  provided  such  change is  permitted  by the Code,  and shall give
written  notice of any such change to the Limited  Partners  within  thirty (30)
days after the occurrence thereof.


                  9.09.  ANNUAL BUDGET.

                         9.09(a)  Distribution of Annual  Budgets.  Prior to the
commencement  of each new Fiscal Year,  the General  Partner  shall  prepare and
distribute  to the members of the Review  Committee a budget  setting  forth the
anticipated  expenditures,  aggregate annual operating  expenses and revenues of
the  Partnership  with  respect to such  Fiscal  Year,  including  the  proposed
overhead expenses of the General Partner which budget shall contain at least the
same line items as the Ten Year  Projection or most recent Approved  Budget,  as
applicable.  This budget may, in the  discretion  of the General  Partner,  also
relate to years other than such Fiscal Year.

                         9.09(b)  Approval of Budgets  Subject to Approval.  All
budgets  required to be submitted to the Review Committee as provided in Section
7.11  and  Section  13.09(e)  (a  "Budget  Subject  to  Approval")  shall  be so
submitted,  subject  to such  provisions.  When a  proposed  Budget  Subject  to
Approval is approved  (or deemed  approved) by the Review  Committee,  then such
Budget Subject to Approval shall become the operative budget for the Fiscal Year
to which it relates.  In the 

                                      -47-
<PAGE>

event that any proposed  Budget Subject to Approval (or revised  proposed Budget
Subject to Approval) is  disapproved by the Review  Committee,  then the General
Partner shall submit a revised  proposed budget to the Review  Committee  within
thirty (30) days after such  disapproval.  If the revised  proposed  budget is a
Budget Subject to Approval,  the Review  Committee and the General Partner shall
attempt in good faith to reach  agreement  on such  revised  budget.  During any
Fiscal Quarter (or portion  thereof) of any Fiscal Year in which no budget is in
effect because a Budget  Subject to Approval has been  disapproved by the Review
Committee,  or has not yet been  approved  (or  deemed  approved)  by the Review
Committee,  then the operative budget for such Fiscal Quarter shall be deemed to
include  (a)  all  liabilities  or  obligations  of the  Partnership  that  were
previously  incurred or committed to by or on behalf of the  Partnership in good
faith and that  became due and  payable  during  such  Fiscal  Quarter,  (b) all
liabilities or obligations  that the General  Partner,  in good faith,  believes
should be incurred or  committed to by or on behalf of the  Partnership  for the
operation of its business or the carrying out of the purposes of the Partnership
during  such  Fiscal  Quarter  (including,  without  limitation,  the payment or
settlement of any claims or potential  claims against the  Partnership)  and (c)
all other  operating  expenses  in an amount  equal to one  hundred  ten percent
(110%) of the  operating  expenses  for such Fiscal  Quarter as set forth in the
most  recent  Approved  Budget  which  relates to the Fiscal  Year in which such
Fiscal Quarter occurs or, if there is no such Approved  Budget,  as set forth in
the Ten Year Projection, provided that, for purposes of this clause (c), if such
Approved Budget or the Ten Year Projection, as applicable,  sets forth operating
expenses  on a fiscal  year basis  rather than on a fiscal  quarter  basis,  the
operating  expenses  for such  Fiscal  Quarter  shall  equal  one-fourth  of the
operating  expenses for the Fiscal Year in which such Fiscal Quarter occurs,  as
set forth in such Approved Budget or the Ten Year Projection, as applicable. Any
operative budget for a Fiscal Quarter (or portion thereof) of any Fiscal Year in
which no budget  is in effect  because a Budget  Subject  to  Approval  has been
disapproved  by the Review  Committee,  or has not yet been  approved (or deemed
approved) by the Review  Committee,  shall be superseded by the budget,  if any,
ultimately  approved (or deemed approved) by the Review Committee or any revised
budget  prepared and  distributed  by the General  Partner to the members of the
Review Committee which is not a Budget Subject to Approval. 9.09(c) In the event
that the General  Partner shall  determine  that the total  expenditures  of the
Partnership  for a Fiscal  Year  will  exceed by ten  percent  (10%) or more all
expenditures of the Partnership,  or that  expenditures by the Partnership for a
Fiscal  Year with  respect  to any  individual  line item will  exceed by twenty
percent (20%) or more the corresponding amount, reflected in the Approved Budget
for such Fiscal Year or Ten Year Projection, as applicable,  the General Partner
shall promptly prepare and submit to the Review Committee for approval  pursuant
to Section  7.10(b)(iii)  an amended  budget for such  Fiscal  Year  pursuant to
Section  9.09(b).  Notwithstanding  the foregoing,  the General Partner shall be
permitted to cause the Partnership to make  expenditures  that (a) do not exceed
by ten percent (10%) or more in the aggregate the aggregate annual  

                                      -48-
<PAGE>

expenditures  and by twenty percent (20%) or more the annual  expenditures  with
respect to any individual  line item,  reflected in the Approved Budget for such
Fiscal Year or Ten Year  Projection,  as applicable,  or (b) that are beyond the
control of the General Partner,  or (c) that the General Partner determines must
reasonably be paid prior to the approval of an amended  budget  pursuant to this
Section 9.09(c) in order to protect the Partnership, the Partnership Assets, the
business of the Partnership or its customers.

                         9.09(d) No budget,  amended budget,  Approved Budget or
increase in any of the foregoing  shall require an increase in the amount of the
Capital  Contribution  of any  Partner  (unless  such  increase  in the  Capital
Contribution  is contained in an amendment to this Agreement  which has received
the written consent of all of the Partners under Section 13.09).


                                    ARTICLE X

                              TRANSFER OF INTERESTS


                  10.01.  TRANSFER.

                         10.01(a) The term "transfer", when used in this Article
X with respect to a Partnership  Interest,  shall include any sale,  assignment,
gift, pledge, hypothecation,  mortgage or other encumbrance,  exchange, or other
disposition, whether voluntary or involuntary, by operation of law or otherwise,
and whether effected directly or indirectly  (including  without  limitation any
change of control of any  Partner or of any Person who  controls  such  Partner,
other than a change of control of the  ultimate  parent  company or other entity
controlling such Partner or Person or in the event such Partner or Person has no
ultimate  controlling  parent company or other  controlling  entity, a change of
control of the  Partner or Person  itself),  except  that  "transfer"  shall not
include  any pledge,  mortgage,  or  hypothecation  of or granting of a security
interest in a Partnership  Interest in connection with any financing obtained on
behalf of the Partnership (so long as such financing,  to the extent required to
be submitted to the Limited Partners under Section 7.04(d) or 7.04(e),  has been
so  submitted  and has  been  approved).  As used in this  Article  X,  the term
"control" means the possession,  directly or indirectly,  of the power to direct
or cause the  direction  of the  management  and  policies of a Person,  whether
through the ownership of voting securities, by contract, or otherwise.

                         10.01(b) No Partnership  Interest shall be transferred,
in whole or in part,  except in  accordance  with the terms and  conditions  set
forth in this Article X. Any transfer or purported  transfer of any  Partnership
Interest not made in accordance with this Article X shall be null and void.

                                      -49-
<PAGE>



                  10.02.  TRANSFER OF INTEREST OF GENERAL PARTNER.

                  The General Partner may not transfer,  or otherwise permit any
Person to hold, its Partnership Interest as a General Partner unless:

                         10.02(a) such transfer in the written  opinion of legal
counsel acceptable to the Review Committee,  in its reasonable  discretion,  (i)
would not violate the then  applicable  federal and state  securities  and other
laws and rules and regulations of the Securities and Exchange Commission,  state
securities commissions and any other governmental  authorities with jurisdiction
over such disposition, (ii) would not result in the Partnership being classified
for Federal  income tax purposes as an  "association  taxable as a  corporation"
rather than as a partnership, (iii) would not prejudice or affect the continuity
of the  Partnership  for the purposes of Section 708 of the Code, and (iv) would
not  affect  the  Partnership's  existence  as a limited  partnership  under the
Delaware RULPA;

                         10.02(b) a successor General Partner is admitted to the
Partnership in accordance with Section 11.03; and

                         10.02(c)   with   respect  to  the   transfer   of  its
Partnership Interest, other than a transfer of the right to a distributive share
of the  income,  gain,  losses,  deductions,  and assets of the  Partnership  in
accordance  with the terms of this  Agreement  which does not reduce the General
Partner's  distributive  share of such  items  below  five  percent  (5%),  such
transfer and the  admission of the  transferee to the  Partnership  as a General
Partner is approved by written consent of an LP Majority.


                  10.03.  TRANSFER OF INTEREST OF LIMITED PARTNER.

                  A Limited  Partner  may  transfer  all or any  portion  of its
Partnership   Interest   except  as   prohibited   under  this  Section   10.03.
Notwithstanding the foregoing,  no transferee of a Limited Partner's Partnership
Interest  shall become a Limited  Partner or have any of the rights of a Limited
Partner,  other  than the right to a  distributive  share of the  income,  gain,
losses, deductions,  distributions,  and assets of the Partnership in accordance
with the terms of this  Agreement,  unless  such  transferee  is admitted to the
Partnership  as a Limited  Partner in accordance  with Section  11.02. A Limited
Partner may not  transfer,  or otherwise  permit any Person to hold,  all or any
portion of its Partnership Interest as a Limited Partner unless:

                         10.03(a)  if  the  transferee  is  not  a  Person  that
controls,  is controlled by, or is under common  control with, the  transferring
Limited  Partner,  the  transferring  Limited  Partner  first  offers  the other
Partners the right to purchase such Partnership  Interest on a pro rata basis in
accordance with their respective Percentage Interests pursuant to Section 10.04;
and

                                      -50-
<PAGE>


                         10.03(b) if the transferee is a Person who controls, is
controlled  by,  or is under  common  control  with,  the  transferring  Limited
Partner,  the  ability of the  transferee  to  perform  its  obligations  to the
Partnership  (including without limitation  obligations under this Agreement and
any  agreement  or contract  between such  transferee  and the  Partnership)  is
reasonably  satisfactory to the General Partner and the  creditworthiness of the
transferee is satisfactory to the Partnership's lenders.


                  10.04.  PARTNERS' RIGHTS OF FIRST REFUSAL.

                         10.04(a) If a Limited  Partner has received a bona fide
written  offer from a  prospective  third  party  purchaser  (including  another
Partner) (a "Third Party Offer") then,  before accepting such Third Party Offer,
such Limited  Partner (the  "Offeror")  shall first offer, to the other Partners
(the  "Offerees"),  on a pro rata  basis in  accordance  with  their  respective
Percentage  Interests,  the Partnership Interest that the Offeror proposes to be
transferred to such third party.  Such Partnership  Interest shall be offered to
the  Offerees at an  offering  price which shall be the same as, and on the same
terms and  conditions  as, those  contained in the Third Party Offer,  or if the
Third Party Offer provides for  consideration  or other terms and conditions not
practically  attainable by the Offerees,  then for  consideration and upon terms
and conditions  substantially  equivalent to those  contained in the Third Party
Offer.  The offer shall be made by a written  notice to the Offerees which offer
notice shall be  accompanied  by a copy of the Third Party  Offer.  The Offerees
shall have thirty (30) days after the date of such offer  notice (the  "Offerees
Election  Period") within which to elect to purchase all (but not less than all)
of the Partnership  Interest proposed to be transferred.  Such election shall be
made by a  written  notice  of  election  given  to the  Offeror  and the  other
Partners.  The  right  of the  Offerees  or any of them to  elect  to make  such
purchase  is  conditioned  upon  the  purchase  by  the  participating  Offerees
collectively  of all of the  Partnership  Interest which is subject to the Third
Party Offer;  provided,  however, that any portion of a Partnership Interest not
purchased by any particular  Offeree may be purchased by the other Offerees on a
pro rata basis in accordance with their respective Percentage  Interests,  or on
such other basis as they may agree,  by written notice to the Offeror within ten
(10) days after the end of the Offerees Election Period. The closing date of any
purchase  by the  Offerees  shall be twenty  (20) days after  expiration  of the
Offerees  Election  Period (or if not a business  day, then on the next business
day thereafter).

                         10.04(b) If the Offerees shall fail to elect,  pursuant
to the terms of Section  10.04(a),  to purchase all of the Partnership  Interest
that is the  subject of the Third  Party  Offer or at any time shall  notify the
Offeror of their elections not to purchase all of such Partnership  Interest, or
shall elect to purchase but fail to close the purchase on the closing date, then
the Offeror  shall be free for a period of ninety (90) days  thereafter  to sell
such  Partnership  Interest  to the Person  that made the Third  Party Offer and
under terms and conditions no less favorable to the Offeror than those contained
in the Third Party Offer,  subject to the limitations set forth in 

                                      -51-
<PAGE>

Section  11.02  regarding  admission of  additional  Limited  Partners.  If such
Partnership  Interest is not so sold by the Offeror  within such 90-day  period,
the Offeror's right to transfer such Partnership Interest shall again be subject
to the foregoing restrictions.

                         10.04(c) If a Limited  Partner  (the  "Offeror  Limited
Partner") wishes to transfer a Partnership  Interest (other than to a transferee
who is a Person that  controls,  is  controlled  by, or is under common  control
with, such Offeror Limited Partner), and if such Offeror Limited Partner has not
yet  received a bona fide  offer that such  Offeror  Limited  Partner  wishes to
accept,  then such Offeror Limited  Partner may elect to offer such  Partnership
Interest to the other  Partners (the "Offeree  Partners") on a pro rata basis in
accordance with their respective Percentage  Interests,  at a price and on terms
proposed by such Offeror Limited Partner.  Such offer shall be made by a written
notice (the  "Proposed Sale Notice") to the Offeree  Partners  setting forth the
price and the terms and conditions proposed by such Offeror Limited Partner. The
Offeree  Partners  shall have thirty  (30) days after the date of such  Proposed
Sale Notice (the "Offeree  Partners  Election  Period") within which to elect to
purchase all (but not less than all) of the Partnership  Interest proposed to be
transferred.  Such election  shall be made by a written notice of election given
to the Offeror Limited Partner and the other Partners.  The right of the Offeree
Partners or any of them to elect to make such purchase is  conditioned  upon the
purchase  by  the  participating  Offeree  Partners  collectively  of all of the
Partnership  Interest proposed to be transferred;  provided,  however,  that any
portion of such Partnership Interest not purchased by any particular Offeree may
be purchased  by the other  Offeree  Partners on a pro rata basis in  accordance
with their respective Percentage  Interests,  or on such other basis as they may
agree,  by written  notice to the Offeror  Limited  Partner within ten (10) days
after the end of the Offeree Partners  Election Period.  The closing date of any
purchase by the Offeree  Partners shall be twenty (20) days after  expiration of
the Offeree Partners Election Period (or if not a business day, then on the next
business day thereafter).

                         10.04(d) If the Offeree  Partners  shall fail to elect,
pursuant to the terms of Section  10.04(c),  to purchase all of such Partnership
Interest  or at any time  shall  notify  the  Offeror  Limited  Partner of their
elections  not to  purchase  all  of the  Partnership  Interest  proposed  to be
transferred,  or shall elect to purchase  but fail to close the  purchase on the
closing date, then the Offeror Limited Partner shall be free for a period of one
hundred  twenty (120) days  thereafter  to sell such  Partnership  Interest at a
price and on terms and  conditions  no less  favorable  to the  Offeror  Limited
Partner  than  those  contained  in the  Proposed  Sale  Notice,  subject to the
limitations  in Section  11.02(a)  regarding  admission  of  additional  Limited
Partners.  If such  Partnership  Interest is not so sold by the Offeror  Limited
Partner  within such 120-day  period,  the Offeror  Limited  Partner's  right to
transfer such  Partnership  Interest shall again be subject to the provisions of
Section 10.04(c).


                                      -52-

<PAGE>


                  10.05.  RESTRICTION ON CERTAIN TRANSFERS.

                  Notwithstanding  any  provision  in  this  Agreement,  the FCC
License  shall  not be  transferred,  assigned  or  disposed  of in any  manner,
voluntarily  or  involuntarily,  including  by any  transfer  of  control of any
corporation  holding that license,  to any person except upon application to the
FCC and upon a finding by the FCC that the public convenience and necessity will
be served thereby.


                                   ARTICLE XI

                       OFFERING OF ADDITIONAL PARTNERSHIP
                  INTERESTS; ADMISSION OF ADDITIONAL PARTNERS;
               WITHDRAWAL OF PARTNERS; REMOVAL OF GENERAL PARTNER


                  11.01.  OFFERING OF ADDITIONAL PARTNERSHIP INTERESTS.

                         11.01(a)  If,  following  the  admission of the Limited
Partners to the  Partnership on the date hereof,  the General  Partner wishes to
cause  the  Partnership  to offer  and sell to third  parties  (including  other
Partners)  additional  limited  partner  Partnership  Interests  (a "Third Party
Offering"), the General Partner shall give notice to each Limited Partner of the
identity  and  background  of the proposed  purchaser  (if not already a Limited
Partner)  and the terms and  conditions  of the  offer  and  shall  submit  such
proposed sale to a vote of the Limited Partners pursuant to Section 7.11(b).  In
exercising  their  right to vote  pursuant  to Section  7.11(b)  concerning  the
proposed offer and sale of additional limited partner Partnership  Interests and
admission of third party purchasers, the Limited Partners shall not unreasonably
withhold their approval. One basis, but not the exclusive basis, for the Limited
Partners to reasonably  withhold their  approval shall be the Limited  Partners'
belief that the  admission of such third party  purchasers  as Limited  Partners
will present a risk to the business,  operations,  goals, finances or regulatory
approvals  of the  Partnership.  In  addition,  it shall be  reasonable  for the
Limited  Partners to condition their approval on the Partnership  first offering
all the then-existing Partners the right to purchase such additional Partnership
Interests on the same terms as are proposed to be offered to such third  parties
and on a pro rata basis in accordance with their respective Percentage Interests
pursuant to  Sections  11.01(b)  and (c).  The  Limited  Partners  may, in their
discretion,  by a vote of  Limited  Partners  holding  a  majority  of the total
Percentage  Interests  then  held by the  Limited  Partners,  require  that as a
condition to any such sale and admission that the  Partnership  obtain a written
opinion of legal counsel  acceptable to the General  Partner,  in its reasonable
discretion,  that such sale and  admission  would not result in the  Partnership
being classified for Federal income tax purposes as an "association taxable as a
corporation"  rather than as a partnership.  In addition,  unless such offer and
sale of additional limited partner  Partnership  Interests and admission of such
third party  purchasers are approved,  pursuant to the vote of Limited  Partners
under Section 7.11(b),  by an LP Majority, 

                                      -53-
<PAGE>

the  Partnership  must first offer all the  then-existing  Partners the right to
purchase such additional Partnership Interests on the same terms as are proposed
to be offered to such third parties and on a pro rata basis in  accordance  with
their respective  Percentage Interests pursuant to Sections 11.01(b) and (c). It
is  acknowledged  and agreed that the sale of additional  Partnership  Interests
will reduce, or otherwise alter,  proportionally the Percentage Interests of the
Partners existing  immediately prior to such sale except to the extent that such
existing Partners  purchase any of such additional  Partnership  Interests.  Any
such reductions or other alterations in the Partners' Percentage Interests shall
be reflected on Schedule B.

                         11.01(b)  If the  General  Partner is required to offer
all  the  then-existing  Limited  Partners  the  right  to  purchase  additional
Partnership Interests pursuant to Section 11.01(a),  the Partnership shall offer
to all the  Partners,  on a pro rata basis in accordance  with their  respective
Percentage Interests,  the additional Partnership Interests that the Partnership
proposes to offer to such third party  purchasers.  Such additional  Partnership
Interests  shall be offered to the partners at an offering  price which shall be
the same as, and on the same terms and  conditions  as,  those  proposed for the
Third Party  Offering.  The offer shall be made by a written  notice to Partners
which shall also identify the designated third party  purchasers,  if then known
by the  Partnership.  The Partners shall have thirty (30) days after the date of
such offer notice (the "Partner  Subscription  Period") within which to elect to
purchase  any or all of such  additional  Partnership  Interests  proposed to be
offered to third  party  purchasers.  Such  election  shall be made by a written
notice of subscription  given to the Partnership and all the other Partners.  In
the event that any of the Partners do not  purchase  the maximum  amount of such
additional  Partnership  Interests to which they are  entitled  pursuant to this
Section 11.01(b),  any of such additional Partnership Interests not so purchased
may be purchased by the other  Partners on a pro rata basis in  accordance  with
their respective Percentage Interests, or on such other basis as they may agree,
by written notice to the  Partnership  within ten (10) days after the end of the
Partner Subscription Period. The closing date of any purchase by the Partners of
such  additional  Partnership  Interests  shall be on such  date as the  General
Partner  shall  reasonably  determine.  Notwithstanding  any  provision  of this
Section 11.01 to the contrary,  the Partnership shall not be required to make an
offer to sell  additional  Partnership  Interests  to the  Partners  if,  in the
reasonable  opinion of the General Partner,  after  consultation  with its legal
counsel,  no exemption  would be available for such offer from the  registration
requirements of the Securities Act of 1933 or applicable state securities laws.

                         11.01(c)  If  the  Partners  shall  fail  to  elect  to
purchase  or shall be  foreclosed  from  purchasing,  pursuant  to the  terms of
Section 11.01(b),  all of the additional  Partnership  Interests  proposed to be
offered  to third  parties,  or shall  elect to  purchase  but fail to close the
purchase on the closing date, then the Partnership shall be free for a period of
two  hundred   seventy  (270)  days  thereafter  to  sell  any  such  additional
Partnership  Interests  not  purchased by the Partners  

                                      -54-
<PAGE>

pursuant  to the terms of Section  11.01(b) to the offeror  whose  identity  was
disclosed to the Limited Partners pursuant to Section  11.01(a),  upon terms and
conditions  no less  favorable to the  Partnership  than those  proposed for the
Third Party Offering.  If such additional  Partnership Interests are not sold by
the Partnership within such 270-day period, the Partnership's  right to make any
offering of additional  Partnership  Interests to third parties (including other
Partners) shall again be subject to the foregoing restrictions.


                  11.02.  ADMISSION OF ADDITIONAL LIMITED PARTNERS.

                         11.02(a)   Following   the  admission  of  the  Limited
Partners to the  Partnership  on the date hereof,  additional  Limited  Partners
(including  substituted  Limited Partners) may be admitted to the Partnership at
such times as the conditions  set forth in Section  11.02(b) have been satisfied
and the admission of such Limited Partners is reflected on the books and records
of the Partnership.

                         11.02(b)  No  Person  shall  have the right to become a
Limited Partner unless:

                         (i) the  General  Partner  consents  in  writing to the
                  admission of such Person as a Limited  Partner,  which consent
                  shall be in the sole and  absolute  discretion  of the General
                  Partner;

                         (ii) such  Person  accepts  and agrees in writing to be
                  bound by all of the terms and provisions of the Agreement; and

                         (iii) such Person (and,  in the case of the transfer of
                  any  Partnership  Interest  of a Limited  Partner  pursuant to
                  Sections  10.03 and 16.05,  the  transferor  Limited  Partner)
                  executes and delivers such other  instruments as are necessary
                  to effect,  and as a  condition  to, such  action,  including,
                  without  limitation,  amendments to this  Agreement and to the
                  Certificate  or any other  instrument  filed with the State of
                  Delaware or any other state.


                  11.03.  ADMISSION OF SUCCESSOR GENERAL PARTNER.

                  A transferee of all of the Partnership Interest of the General
Partner pursuant to Section 10.02, or a Person elected to be a successor General
Partner  upon the  removal of the former  General  Partner  pursuant  to Section
11.06,  shall be admitted to the  Partnership as a General Partner (in the place
of the transferor or former General Partner,  as the case may be),  effective as
of the  date  that an  amendment  of the  Certificate,  adding  the name of such
successor General Partner and other required  information,  is recorded pursuant
to Section 2.01 (which date,  in the event the successor  General  Partner is in
the  place  in whole of the  transferor  or  former  General  Partner,  shall be
immediately  prior  to the  withdrawal  of such  

                                      -55-

<PAGE>

transferor or former General Partner), and upon prior receipt by the Partnership
of all of the following:

                         11.03(a) the successor General Partner's acceptance of,
and agreement to be bound by, all of the terms and provisions of this Agreement,
in form and substance  satisfactory to the Partnership and all other  agreements
then in effect  between the General  Partner  and any Limited  Partner  (and any
other parties);

                         11.03(b)  evidence of the  authority of such  successor
General  Partner to become a General Partner and to be bound by all of the terms
and conditions of the Agreement  including without  limitation the provisions of
Sections  3.03,  7.01(f)  and 10.05  with  regard to the  assignment  of the FCC
License;

                         11.03(c) the written agreement of the successor General
Partner to continue the business of the Partnership in accordance with the terms
and provisions of the Agreement; and

                         11.03(d) such other  documents or instruments as may be
required in order to effect the admission of the successor  General Partner as a
General Partner under this Agreement.


                  11.04.  WITHDRAWAL OF GENERAL PARTNER.

                  The  General  Partner  may   voluntarily   withdraw  from  the
Partnership  only upon a transfer of all of such General  Partner's  Partnership
Interest  as a General  Partner in  accordance  with  Article  X. The  voluntary
withdrawal  of the General  Partner  shall not affect the benefits to IPSP under
such license.  The General Partner shall have no liability to the Partnership or
the Partners on account of any  withdrawal in accordance  with the terms of this
Section 11.04,  but such withdrawal shall not relieve the General Partner of its
outstanding  obligations and liabilities  towards the  Partnership,  the Limited
Partners and third parties.


                  11.05.  Withdrawal of Limited Partner.

                  Any  Limited  Partner  may   voluntarily   withdraw  from  the
Partnership  at any  time  upon a  transfer  of all of  such  Limited  Partner's
Partnership  Interest  as a Limited  Partner  in  accordance  with  Article X or
transfer of such Limited Partner's Partnership Interest to the Partnership.


                  11.06.  REMOVAL OF GENERAL PARTNER.

                         11.06(a) Subject to the provisions of Sections 3.03 and
11.03 with  regard to the  transfer or control of the FCC  License,  the General
Partner  shall be removed as a general  partner if (i) it is found by a court of
competent  jurisdiction,  by a final  non-appealable  judgment,  that any of the
General Partner's  actions as 

                                      -56-
<PAGE>

general partner  constituted actual fraud, gross negligence,  willful misconduct
or breach of fiduciary  duty (under  Delaware law,  this  Agreement or any other
contract  between the Partnership and Limited  Partners  generally) and (ii) the
Limited Partners, by the affirmative vote of Limited Partners holding two-thirds
of the Percentage  Interests then held by Limited  Partners,  vote to remove the
General Partner.  The General Partner may be removed as a general partner of the
Partnership  for "cause" (as hereinafter  defined) upon the affirmative  vote of
Limited  Partners  holding  two-thirds of the Percentage  Interests then held by
Limited Partners.  Any such action by the Limited Partners must also provide for
the prompt election of a successor  General Partner by Limited  Partners holding
two-thirds of the Percentage Interests then held by Limited Partners,  and shall
become  effective  only upon the  admission  of the  successor  General  Partner
pursuant to Section 11.03. As used herein,  "cause" shall mean (i) actual fraud,
gross  negligence,  or willful  misconduct  or breach of  fiduciary  duty (under
Delaware law, this Agreement or any other contract  between the  Partnership and
Limited  Partners  generally) of the General  Partner,  (ii) the  Bankruptcy (as
defined in Section 12.01) of the General Partner, or (iii) the declaration of an
event of default under the credit documents with respect to the financing of the
Partnership's  proposed  satellites by the banks (or their agent, as applicable)
under the terms of such credit  documents  and an  indication  by such banks (or
such agent,  as applicable) in writing that the banks intended to foreclose upon
any  Partnership   Assets  or  other  collateral  (as  defined  in  such  credit
documents),  unless such event of default is due  principally  to  circumstances
that are reasonably  beyond the control of the General Partner,  in each case as
determined by the Independent Party. The removal of the General Partner pursuant
to this  Section  11.06(a)  shall not be deemed to be an election of remedies by
the Partnership or the Limited Partners,  and such removal shall not relieve the
General  Partner of its  outstanding  obligations  and  liabilities  towards the
Partnership, the Limited Partners and third parties.

                         11.06(b)  Written  notice  of  removal  of the  General
Partner  pursuant to this Section 11.06 shall be provided to the General Partner
in the manner provided in Section 13.02.

                         11.06(c)  In the event the  General  Partner is removed
pursuant to this  Section  11.06,  the  removed  General  Partner's  Partnership
Interest  as a  General  Partner  automatically  shall  be  converted  into  the
Partnership  Interest of a Limited Partner and the removed General Partner shall
retain all its Percentage  Interest and thereupon be admitted as and be deemed a
Limited Partner for all purposes.

                         11.06(d) Any successor General Partner elected pursuant
to  Section  11.06(a)  shall,  at the  effective  date of its  admission  to the
Partnership  as  the  General  Partner,  make  a  Capital  Contribution  to  the
Partnership  in  an  amount  such  that,   immediately  following  such  Capital
Contribution,  the balance of the successor  General  Partner's  Capital Account
shall  be no less  than  one  percent  (1%)  of the  aggregate  balances  of all
Partners' Capital Accounts.

                                      -57-

<PAGE>

                         11.06(e)  Prior to any removal of the  General  Partner
under this Agreement, notice shall be given to the FCC of such proposed removal,
and any successor  General  Partner  shall,  prior to the effective  date of its
admission to the Partnership as the General Partner,  comply with the provisions
of Section  3.03.  The General  Partner  agrees that, if the FCC License is then
held by the General Partner and not the Partnership, it will take any action and
execute any instruments necessary to obtain from the FCC such approval as may be
necessary for the  assignment to a Person  designated by the  Partnership as the
successor  General  Partner of such  license,  the rights under which shall have
been  contributed  by the General  Partner to the  Partnership  pursuant to this
Agreement.  The General  Partner  hereby  appoints  each Limited  Partner as its
attorney-in-fact, with full power of substitution, for the purpose of taking any
action and  executing  any  instruments,  in the event of the General  Partner's
removal under this Agreement,  necessary for obtaining such approval of the FCC.
The  General  Partner  hereby  agrees that the  subject  matter of this  Section
11.06(e) is unique, and that in addition to any other remedies which the Limited
Partners may have at law or in equity,  the General  Partner  hereby agrees that
the Limited Partners shall have the right to have all obligations, undertakings,
agreements, covenants and other provisions of this Section 11.06(e) specifically
performed by the General Partner,  that the General Partner waives any equitable
defenses it may have to such specific performance, and that the Limited Partners
shall have the right to obtain an order or decree of such  specific  performance
in any of the  courts of the  United  States or of any state or other  political
subdivision thereof.


                                   ARTICLE XII

                           DISSOLUTION AND LIQUIDATION


                  12.01.  EVENTS CAUSING DISSOLUTION.

                  The  Partnership  shall be dissolved  and its affairs wound up
upon the occurrence of any of the following events:

                         12.01(a)  expiration of the term of the  Partnership on
the Termination Date;

                         12.01(b) the election in writing of the General Partner
and the Limited Partners holding two-thirds of the total Percentage Interests of
the Limited Partners to dissolve and wind up the affairs of the Partnership;

                         12.01(c)   the  sale  or  other   disposition   by  the
Partnership  (other  than  in  the  ordinary  course  of  business)  of  all  or
substantially  all of the  Partnership  Assets and the collection of all amounts
derived from any such sale or disposition,  including all amounts payable to the
Partnership under any promissory notes or other evidences of indebtedness  taken
by the Partnership in connection with such 

                                      -58-

<PAGE>

sale or other disposition  (unless the General Partner shall elect to distribute
such indebtedness to the Partners in liquidation);

                         12.01(d) the Bankruptcy (as hereinafter defined) of the
General Partner;

                         12.01(e) the Bankruptcy (as hereinafter defined) of the
Partnership  and the  determination  of the General  Partner not to continue the
business of the Partnership; or

                         12.01(f) except as provided in Section  12.01(d) above,
the occurrence of any event that would cause the General  Partner to cease to be
a general partner of the Partnership under Section 17-402 of the Delaware RULPA;
or

                         12.01(g) the entry of a decree of judicial  dissolution
under Section 17-802 of the Delaware RULPA.

                  For the purposes of this Agreement,  the term  "Bankruptcy" of
the General  Partner or the  Partnership,  as  applicable,  shall mean,  and the
General Partner or the Partnership,  as applicable,  shall be deemed "Bankrupt,"
if it:

                  a.     makes an assignment for the benefit of creditors;

                  b.     files a voluntary petition in bankruptcy;

                  c.     is  adjudged a bankrupt  or  insolvent,  or has entered
                         against  it an order of  relief  in any  bankruptcy  or
                         insolvency proceeding and such adjudication or order is
                         final and not subject to appeal;

                  d.     files a  petition  or answer  seeking  for  itself  any
                         reorganization, arrangement, composition, readjustment,
                         liquidation,  dissolution  or similar  relief under any
                         statute, law or regulation;

                  e.     files an answer or other pleading  admitting or failing
                         to contest the material allegations of a petition filed
                         against it in any proceeding of this nature; or

                  f.     seeks,  consents to or acquiesces in the appointment of
                         a trustee, receiver or liquidator of the Partnership or
                         of all or any substantial part of its properties.

                  The term  "Bankruptcy,"  as defined  above and as used in this
Agreement, is intended and shall be deemed to supersede and replace the event of
withdrawal described in Sections 17-402(a)(4) and (5) of the Delaware RULPA.

                                      -59-
<PAGE>

                  12.02.  RIGHT TO CONTINUE BUSINESS OF PARTNERSHIP.

                  Upon an event described in Sections 12.01(d) or 12.01(f),  the
Partnership  shall not be  dissolved or be required to be wound up if (A) at the
time of such event there is at least one remaining  General  Partner who carries
on the business of the Partnership  (and each such remaining  General Partner is
hereby  authorized  to  carry  on  the  business  of  the  Partnership   without
dissolution),  or (B) within  ninety (90) days after such event,  all  remaining
Partners  agree in writing (a) to continue the business of the  Partnership  and
(b) to the  appointment,  effective as of the date of such event, of one or more
additional General Partners if necessary or desired.


                  12.03.  LIQUIDATION.

                         12.03(a) Upon the dissolution of the  Partnership,  the
General  Partner (or other person  responsible for winding up the affairs of the
Partnership)  shall promptly  notify the Partners of such  dissolution and shall
proceed  without  any  unnecessary  delay  to sell or  otherwise  liquidate  the
Partnership  Assets and pay or make due  provision for the payment of all debts,
liabilities and obligations of the Partnership.

                         12.03(b) After adequate provision has been made for the
payment of all debts, liabilities and obligations of the Partnership (other than
liabilities for distributions to Partners), the General Partner (or other person
responsible for winding up the affairs of the Partnership)  shall distribute the
net  liquidation  proceeds and any other liquid assets of the Partnership to the
Partners in accordance with Section 6.05. No distribution in kind of Partnership
Assets,  other than cash and other  liquid  assets,  shall be made  without  the
approval of the Review Committee.

                         12.03(c) A  reasonable  time  shall be allowed  for the
orderly  winding  up of the  business  and  affairs of the  Partnership  and the
liquidation  of its assets  pursuant to this Section  12.03 in order to minimize
any losses otherwise attendant upon such a winding up.


                  12.04.  TERMINATION OF PARTNERSHIP.

                  Except  as   otherwise   provided  in  this   Agreement,   the
Partnership shall terminate when all of the assets of the Partnership shall have
been  converted  into cash,  the net  proceeds  therefrom,  as well as any other
liquid  assets of the  Partnership,  after  payment of or due  provision for the
payment of all debts, liabilities and obligations of the Partnership, shall have
been  distributed  to the  Partners as provided  for in Section 6.05 and Section
12.03,  and the Certificate  shall have been cancelled in the manner required by
the Delaware RULPA.

                                      -60-

<PAGE>

                                  ARTICLE XIII

                            MISCELLANEOUS PROVISIONS


                  13.01.  ADDITIONAL ACTIONS AND DOCUMENTS.

                  Each of the  Partners  hereby  agrees  to take or  cause to be
taken such further actions, to execute,  acknowledge,  deliver and file or cause
to be executed,  acknowledged,  delivered  and filed such further  documents and
instruments,  and to  use  best  efforts  to  obtain  such  consents,  as may be
necessary or as may be  reasonably  requested in order to fully  effectuate  the
purposes,  terms and conditions of this Agreement,  whether before,  at or after
the closing of the transactions contemplated by this Agreement.


                  13.02.  NOTICES.

                  All notices,  demands,  requests or other communications which
may be or are  required  to be  given,  served,  or  sent  by a  Partner  or the
Partnership  pursuant  to this  Agreement  shall be in writing and shall be hand
delivered (including delivery by courier), mailed by first-class,  registered or
certified mail, return receipt  requested,  postage prepaid or by "overnight" or
express mail or courier service, or transmitted by telegram,  telex or facsimile
transmission  (if an additional  copy is sent by  "overnight" or express mail or
courier  service  in  addition  to the  facsimile  transmission),  addressed  as
follows:

                  (i)      If to the General Partner:

                           Orion Satellite Corporation
                           2440 Research Blvd.
                           Suite 400
                           Rockville, Maryland  20858-3238
                           Attention:
                           Telex/Fax Nos.:


                  (ii)     If to a Limited Partner:

                           At the address  specified for such Limited Partner in
                           Schedule A


                  (iii)    If to the Partnership:

                           International Private Satellite Partners, L.P.
                           2440 Research Drive
                           Suite 400
                           Rockville, Maryland  20858-3238
                           Attention:
                           Telex/Fax Nos.:

                                      -61-

<PAGE>

Each  Partner  and the  Partnership  may  designate  by notice in  writing a new
address to which any notice,  demand, request or communication may thereafter be
so given,  served or sent. Each notice,  demand,  request or communication which
shall be delivered,  mailed or transmitted in the manner described above,  shall
be deemed sufficiently given,  served, sent or received for all purposes at such
time as it is delivered to the addressee (with an affidavit of personal delivery
(and in the case of communications by facsimile  transmission,  the affidavit of
the  "overnight"  or express mail or courier  service  delivering the additional
copy), the return receipt,  the delivery  receipt,  or (with respect to a telex)
the answer back being deemed  conclusive,  but not  exclusive,  evidence of such
delivery)  or at  such  time  as  delivery  is  refused  by the  addressee  upon
presentation.


                  13.03.  SEVERABILITY.

                  Except as otherwise expressly provided in this Agreement,  the
invalidity  of any one or more  provisions  hereof or of any other  agreement or
instrument  given  pursuant to or in connection  with this  Agreement  shall not
affect the remaining  portions of this Agreement or any such other  agreement or
instrument or any part thereof, all of which are inserted conditionally on their
being  held valid in law;  and in the event  that one or more of the  provisions
contained herein or therein should be invalid,  or should operate to render this
Agreement or any such other agreement or instrument invalid,  this Agreement and
such other  agreements  and  instruments  shall be  construed as if such invalid
provisions had not been inserted;  provided,  however, that such severability of
the remaining  portions  shall be  conditional  upon the good faith and diligent
efforts of IPSP and the  Limited  Partner(s)  whose  rights  and/or  duties were
declared invalid to negotiate and agree upon new provision(s) which will closely
replicate the void provision(s) and which will be valid and enforceable.


                  13.04.  SURVIVAL.

                  It is the express intention and agreement of the Partners that
all  covenants,   agreements,   statements,   representations,   warranties  and
indemnities  made in this Agreement  shall survive the execution and delivery of
this Agreement.


                  13.05.  WAIVERS.

                  Neither  the  waiver by a Partner  of a breach of or a default
under any of the provisions of this Agreement,  nor the failure of a Partner, on
one or more occasions,  to enforce any of the provisions of this Agreement or to
exercise any right,  remedy or privilege hereunder shall thereafter be construed
as a waiver of any  subsequent  breach or default of a similar  nature,  or as a
waiver of any such provisions, rights, remedies or privileges hereunder.

                                      -62-

<PAGE>

                  13.06.  EXERCISE OF RIGHTS.

                  No  failure  or  delay  on  the  part  of  a  Partner  or  the
Partnership in exercising any right, power or privilege  hereunder and no course
of dealing between the Partners or between a Partner and the  Partnership  shall
operate as a waiver  thereof;  nor shall any single or partial  exercise  of any
right,  power or  privilege  hereunder  preclude  any other or further  exercise
thereof or the exercise of any other right,  power or privilege.  The rights and
remedies herein expressly provided are cumulative and not exclusive of any other
rights or remedies which a Partner or the  Partnership  would  otherwise have at
law or in equity or otherwise.


                  13.07.  BINDING EFFECT.

                  Subject to any provisions hereof restricting assignment,  this
Agreement  shall be binding  upon and shall inure to the benefit of the Partners
and  their  respective  heirs,   devises,   executors,   administrators,   legal
representatives, successors and assigns.


                  13.08.  LIMITATION ON BENEFITS OF THIS AGREEMENT.

                  It is the explicit  intention of the Partners that,  except as
otherwise expressly agreed in writing by the Partners, no person or entity other
than the  Partners  and the  Partnership  is or shall be  entitled  to bring any
action to enforce any  provision  of this  Agreement  against any Partner or the
Partnership,  and that the covenants,  undertakings  and agreements set forth in
this Agreement shall be solely for the benefit of, and shall be enforceable only
by, the  Partners  (or their  respective  successors  and  assigns as  permitted
hereunder) and the Partnership.


                  13.09.  AMENDMENT PROCEDURE.

                  This  Agreement  may not be  modified  or  amended  except  as
expressly set forth below.

                         13.09(a)  This  Agreement may be modified or amended by
the General  Partner,  without the consent or approval of the Limited  Partners,
except as set forth in Section 13.09(c),  (i) to cure any ambiguity,  to correct
or supplement any provision  herein which would be  inconsistent  with any other
provision  herein,  or to make any other  provision  with  respect to matters or
questions  arising under this Agreement which will not be inconsistent  with the
provisions  of this  Agreement;  (ii) to  delete  or add any  provision  of this
Agreement required to be so deleted or added by any federal agency or by a state
"Blue Sky"  commissioner  or similar  official,  which  addition  or deletion is
deemed by such agency or official  to be for the  benefit or  protection  of the
Limited  Partners;  (iii) to amend Schedules A and B to reflect the admission of
additional or substitute  Limited Partners pursuant to Section 11.02; or (iv) to
permit the  allocations  provided for in Article VI to be respected  for federal
income  tax  purposes  or  to  avoid  the   Partnership   being  treated  as  an
"association"  

                                      -63-
<PAGE>

for federal income tax purposes;  provided  however,  that no amendment shall be
adopted pursuant to this Section 13.09(a) unless the adoption thereof (A) is not
adverse to the interest of the Limited Partners;  (B) does not affect the method
of  distribution  of cash or allocation of net profits or net losses provided in
Article VI among the Limited  Partners or between the Limited  Partners  and the
General Partner;  and (C) does not adversely affect the limited liability of the
Limited Partners contemplated by this Agreement or the status of the Partnership
as a partnership for federal income tax purposes.  The power of attorney granted
pursuant to Section 7.03 may be used by the General Partner to execute on behalf
of a Limited Partner any document  evidencing or effecting an amendment  adopted
in accordance with this Section 13.09.

                         13.09(b) This Agreement also may be modified or amended
with the written consent of the General Partner and of an LP Majority;  provided
however,  that any modification or amendment which would (i) increase the amount
of Capital Contributions payable by the Limited Partners, (ii) affect the rights
of the  Partners  under  Article  VI, or (iii)  except as  provided  in  Section
13.09(a), amend Article V, Article VI, Article XII, or this Section 13.09, shall
require the written consent of all the Partners.

                         13.09(c) [Intentionally Omitted.]

                         13.09(d)  Notwithstanding  anything to the  contrary in
this  Agreement,  this  Agreement  may not be  modified or amended in any manner
which,  in the  view of the FCC or in the  reasonable  judgment  of the  General
Partner or its counsel,  would (i) result in any violation  (either  through the
possession  of such power or through the taking of any  specific  action) of any
law, rule or regulation applicable to the Partnership and its proposed business,
including without  limitation the United States'  Communications Act of 1934, as
amended,  or the rules and regulations of the FCC as now or hereafter in effect,
or (ii) result in a transfer of control (as defined in the rules and regulations
of the FCC as now or hereafter in effect) of the General  Partner,  the business
or operations of the General  Partner or the licenses issued by the FCC relating
to the construction, launch and operation of the satellite(s) owned by IPSP.

                         13.09(e)  The  Ten  Year   Projection   constitutes  an
integral and  substantial  part of this Agreement and cannot be amended  without
the unanimous  approval of the Limited  Partners.  In addition,  if any Proposed
Budget  relating  to a period of longer  than one Fiscal  Year or that  requires
multi-year  expenditures  calls for a  percentage  increase for any Fiscal Year,
other than the first  Fiscal Year of the Proposed  Budget,  of 2 percent or more
over the budget for such Fiscal Year as reflected in the Ten Year  Projection or
Approved Budget, whichever is applicable,  then the entire Proposed Budget shall
require the unanimous approval of the Limited Partners.

                                      -64-
<PAGE>

                  13.10.  WAIVER OF PARTITION.

                  Each Partner hereby irrevocably waives any and all rights that
it may have to  maintain  an  action  for  partition  of any of the  Partnership
Assets.


                  13.11.  CONSOLIDATION.

                  In  interpreting  this  Agreement,  it is understood  that the
operations of any  corporation or other entity in which the  Partnership  has an
ownership  interest and which is  controlled by the  Partnership  or the General
Partner  will be  consolidated  to the  extent  appropriate  with  those  of the
Partnership.


                  13.12.  ENTIRE AGREEMENT.

                  Except  as set forth in this  Section  13.12,  this  Agreement
(including the Schedules and annexes hereto) contains the entire agreement among
the  Partners  with  respect  to  the  transactions   contemplated  herein,  and
supersedes all prior (but not contemporaneous)  written and all oral agreements,
commitments or  understandings  with respect to the matters  provided for herein
and therein.  Notwithstanding  this  Section  13.12,  each of the Partners  have
entered into other agreements prior to the date hereof or contemporaneously with
the  execution  of this  Agreement,  all of  which  relate  to the  transactions
contemplated  herein,  and the  terms  of  which  are no less  binding  upon the
signatories  thereto  than are the  terms  of this  Agreement  binding  upon the
signatories hereto.


                  13.13.  PRONOUNS.

                  All pronouns  and any  variations  thereof  shall be deemed to
refer to the masculine, feminine, neuter, singular or plural, as the identity of
the person or entity may require.


                  13.14.  HEADINGS.

                  Article,  Section and  subsection  headings  contained in this
Agreement are inserted for convenience of reference only, shall not be deemed to
be a part of this Agreement for any purpose,  and shall not in any way define or
affect the meaning, construction or scope of any of the provisions hereof.


                  13.15.  GOVERNING LAW.

                  This  Agreement,  the rights and  obligations  of the  parties
hereto,  and any claims or disputes relating  thereto,  shall be governed by and
construed  in  accordance  with  the  laws of the  State  of  Delaware  (but not
including the choice of law rules thereof).

                                      -65-

<PAGE>

                  13.16.  EXECUTION IN COUNTERPARTS.

                  To facilitate execution,  this Agreement may be executed in as
many  counterparts  as may be required;  and it shall not be necessary  that the
signatures  of, or on behalf  of,  each  party,  or that the  signatures  of all
persons required to bind any party, appear on each counterpart;  but it shall be
sufficient  that the  signature  of, or on behalf of,  each  party,  or that the
signatures of the persons  required to bind any party,  appear on one or more of
the  counterparts.  All  counterparts  shall  collectively  constitute  a single
agreement.  It shall not be  necessary  in  making  proof of this  Agreement  to
produce  or  account  for more  than a number  of  counterparts  containing  the
respective signatures of, or on behalf of, all of the parties hereto.


                  13.17.  INTEREST RATES.

                  Any provision of this Agreement  containing,  or requiring the
use of, a stated  interest  rate  shall be  deemed to refer to the lower of such
stated rate and the highest rate permitted by applicable law.


                                   ARTICLE XIV

                                 STET REDEMPTION


         14.01.   RATIFICATION OF STET  REDEMPTION,  ISSUANCE OF NEW INTEREST TO
                  ONS.

                  Notwithstanding  anything in this  Agreement to the  contrary,
the following actions are hereby authorized, approved, ratified and confirmed in
all respects and do not violate or constitute a breach of or a default under any
provision of this  Agreement:  (i) the redemption by the  Partnership in 1995 of
the 8.33% limited  partnership  interest of Societa  Finanziaria  Telefonica-per
Azioni  ("STET"),  and the  withdrawal  of STET as a  limited  partner  from the
Partnership  pursuant to Section 11.05 of the Agreement;  (ii) the issuance of a
new 8.33% limited partnership interest to existing limited partner Orion Network
Systems,  Inc.  ("ONS");  (iii)  recognition  of  the  assumption  by ONS of the
obligations of an Affiliate of STET, Telecom Italia S.p.A.  ("Telecom  Italia"),
to make contingent payments pursuant to the Contingent  Communications Satellite
Capacity  Agreement to which Telecom Italia and the Partnership are parties (the
"STET/Telecom Italia Contingent Payment Obligations");  (iv) the modification or
termination  of  certain  bilateral  and  multilateral  agreements  between  the
Partnership  and  STET (or  Telecom  Italia,  as the  case may be) or among  the
Partnership, STET (or Telecom Italia, as the case may be) and some or all of the
Limited Partners;  (v) the amendment of certain provisions of the Second Amended
and Restated  Agreement,  including  the deletion of  provisions  of Article XVI
thereof  relating  to  certain  specific  rights  of STET  and  its  affiliates,
amendment of Schedules A and B to the Second  Amended and Restated  Agreement to
reflect  the  redemption  of STET's  8.33%  limited  partnership  interest,  

                                      -66-
<PAGE>

the  withdrawal of STET from the  Partnership,  the sale to ONS of an additional
limited  partnership  interest,  and the adjustment by the General  Partner,  in
consultation  with the  accounting  firm that  prepares  the Federal  income tax
returns of the Partnership, of the Partners' Capital Accounts in accordance with
Regulations sections 1.704-1(b)(2)(iv)(f) and 1.704-1(b)(2)(iv)(g)(1) to reflect
the redemption of STET's limited partnership interest and the acquisition by ONS
of an additional limited partner interest; and (vi) the execution,  delivery and
performance by the Partnership of a Redemption  Agreement,  dated as of November
___, 1995, between the Partnership and STET (the "STET Redemption Agreement"), a
Subscription Agreement,  dated as of November ___, 1995, between the Partnership
and ONS (the  "Subscription  Agreement"),  an  Indemnity  Agreement  dated as of
November  ___,  1995,  among  the  Partnership,  Telecom  Italia  and  ONS  (the
"Indemnity  Agreement"),  and an  IPSP-Telecom  Italia  Agreement,  dated  as of
November ___,  1995,  between the  Partnership  and Telecom  Italia S.p.A.  (the
"IPSP-Telecom Italia Agreement"), and the agreements,  documents and instruments
referred to therein.


         14.02.  STET's UNRECOVERED CONTINGENT CONTRIBUTIONS.

                  Notwithstanding  anything in this  Agreement to the  contrary,
(i) all Unrecovered Contingent Contributions of STET prior to November ___, 1995
shall  constitute  Unrecovered  Contingent  Contributions  of ONS from and after
November  __,  1995,  and  (ii)  all  STET/Telecom   Italia  Contingent  Payment
Obligations  paid by ONS (or on its  behalf)  from and after  November  __, 1995
(including  without  limitation  pursuant  to  the  Indemnity  Agreement)  shall
constitute  (including  for  purposes  of  determining   Unrecovered  Contingent
Contributions)  contingent  payments  made  by  ONS  or  its  Affiliate  to  the
Partnership  pursuant to Article II of the Contingent  Communications  Satellite
Capacity  Agreement  (or to a payment  guarantee  agreement in  accordance  with
Article III of the Contingent  Communications  Satellite Capacity Agreement) and
treated as  contributions  by ONS to the capital of the Partnership  pursuant to
Section 5.01 of the Contingent Communications Satellite Capacity Agreement.


         14.03.  TERMINATION AND MODIFICATION OF STET AGREEMENTS.

                  The parties hereby consent to and ratify the  termination,  as
of the effective date of the STET Redemption  Agreement and IPSP-Telecom  Italia
Agreement,  of each of the bilateral  and  multilateral  agreements,  as amended
through such effective date, set forth on Annex 1 hereto between the Partnership
and STET (or Telecom Italia, as the case may be) or among the Partnership,  STET
(or Telecom Italia, as the case may be) and some or all of the Limited Partners,
and agree that (and such  agreements are hereby amended to the extent  necessary
so that) such  agreements  are  terminated in their entirety as of the effective
date of the STET Redemption Agreement and IPSP-Telecom Italia Agreement.


                                      -67-

<PAGE>

                  The parties hereby consent to and ratify the modification,  as
of the effective date of the STET Redemption  Agreement and IPSP-Telecom  Italia
Agreement,  of each of the  multilateral  agreements,  as amended  through  such
effective  date,  set forth on Annex 2 hereto  among the  Partnership,  STET (or
Telecom Italia, as the case may be) and some or all of the Limited Partners,  to
remove  STET  (or  Telecom  Italia,  as the  case  may  be) as a  party  to such
agreements and to provide that such agreements, as so modified, continue in full
force and effect,  such modification to be effective as of the effective date of
the STET Redemption Agreement and IPSP-Telecom Italia Agreement.

                  The parties hereby consent to and ratify the modification,  as
of the effective date of the STET Redemption  Agreement and IPSP-Telecom  Italia
Agreement,  of each of the  agreements  set forth on Annex 3 hereto,  as amended
through  such  effective  date,  between  the  Partnership  and STET (or Telecom
Italia, as the case may be), which modifications are described on Annex 3 or the
attachments  thereto and to provide that such  agreements,  as so modified  (and
with such  additional  modifications  not  material  to the  Partnership  or any
Limited  Partner  and  agreed  to by  the  General  Partner  on  behalf  of  the
Partnership and set forth on the applicable modification documents), continue in
full force and effect,  such  modification  to be effective as of the  effective
date of the STET Redemption Agreement and IPSP-Telecom Italia Agreement.

                  In the event that the parties to the  agreements  set forth on
Annexes 1, 2 or 3 hereto include  affiliates of Limited Partners rather than the
Limited  Partners  themselves,  the consents  given under this Section 14.03 are
given both on behalf of such affiliates and their affiliated  Limited  Partners,
and the affiliated  Limited  Partners  agree to cause such  affiliates to supply
additional  consents to the effect of the applicable  provisions of this Section
14.03 upon the reasonable written request of any party hereto.


         14.04.  BA WAIVER.

                  British  Aerospace  Communications,  Inc.  ("BA"),  as of  the
effective  date  of  the  STET  Redemption  Agreement  and  IPSP-Telecom  Italia
Agreement,  waived  its rights  pursuant  to the  Consent  and  Agreement  dated
December 20, 1991 among the Partnership and the Limited Partners with respect to
the additional limited partnership  interest that was purchased by ONS (the "New
Interest"),  including  BA's  rights to (i) have the  Partnership  refrain  from
offering the New Interest  until certain of BA's limited  partnership  interests
have been  repurchased,  or require the purchaser of the New Interest to acquire
certain  of BA's  limited  partnership  interests  or (ii) have  certain of BA's
limited partnership  interests purchased by the Partnership with the proceeds of
the sale of the New Interest.

                                      -68-
<PAGE>

                                   ARTICLE XV

                              PARTNERSHIP APPROVALS

                  Notwithstanding  anything in this  Agreement to the  contrary,
except as set forth  below in this  Article  XV,  the  execution,  delivery  and
performance  by the  Partnership  of the  following  agreements,  documents  and
instruments (of which there may be one or more versions),  among the Partnership
and Partners or prospective  partners of the Partnership or their Affiliates and
other Persons which are dated on or prior to the date of this Agreement,  or any
amendments  or amendment  and  restatements  of such  agreements,  documents and
instruments,  are hereby  authorized,  approved,  ratified and  confirmed in all
respects  and do not violate or  constitute  a breach of or a default  under any
provision  of  this  Agreement:   subscription  agreements,  escrow  agreements,
communications  satellite capacity  agreements,  option  agreements,  contingent
communications satellite capacity agreements, Agreements of Principles regarding
service  offerings by the  Partnership,  agreements  relating to  marketing  and
related  services  with respect to the sale of the  Partnership's  international
communications  satellite  facilities,  agreements  relating to distribution and
sales  representation  with respect to the  Partnership's  services  (which such
agreements,  consistent  with the terms of Section  7.10,  may be  exclusive  in
nature and  pursuant to which sales are not  governed by  contractual  terms and
conditions set solely by the General Partner),  consent and agreement concerning
the rights of one limited  partner to transfer  certain  partnership  interests,
assignment  and  assumption  between  the General  Partner and the  Partnership,
agreement regarding certain possible conveyances,  agreement regarding preferred
bidding,  and such other  agreements,  documents  and  instruments  to which the
Partnership is a party dated on or prior to the date of this Agreement that have
been  entered into or executed by the  Partnership.  Nothing  contained  herein,
however,  shall  constitute  or reflect any  approval or waiver of rights by any
Limited  Partner with respect to the  execution,  delivery or performance by the
Partnership  or the General  Partner of any agreement  which was not provided by
the Partnership or the General Partner to such Limited Partner prior to the date
hereof.

                       [Signatures commence on next page]


                                      -69-

<PAGE>




                                   ARTICLE XVI

                                    EXECUTION

                  IN WITNESS  WHEREOF,  the undersigned  have duly executed this
Agreement, or have caused this Agreement to be duly executed on their behalf, as
of the day and year first hereinabove set forth.

                                             General Partner:

                                             ORION SATELLITE CORPORATION

                                             By:
                                                  ------------------------------

                                             Title:
                                                  ------------------------------



                                             LIMITED PARTNERS:

                                             -----------------------------------


                                             By:
                                                  ------------------------------

                                             Title:
                                                  ------------------------------


                                             -----------------------------------


                                             By:
                                                  ------------------------------

                                             Title:
                                                  ------------------------------


                                             -----------------------------------



                                             By:
                                                  ------------------------------

                                             Title:
                                                  ------------------------------


                                      -70-


<PAGE>

                                             -----------------------------------


                                             By:
                                                  ------------------------------

                                             Title:
                                                  ------------------------------


                                             -----------------------------------


                                             By:
                                                  ------------------------------

                                             Title:
                                                  ------------------------------


                                             -----------------------------------


                                             By:
                                                  ------------------------------

                                             Title:
                                                  ------------------------------


                                             -----------------------------------


                                             By:
                                                  ------------------------------

                                             Title:
                                                  ------------------------------

                                      -71-

<PAGE>

                                                                      SCHEDULE A
                                                                      ----------

                             NAMES AND ADDRESSES AND
                        CAPITAL CONTRIBUTIONS OF PARTNERS
                        ---------------------------------

GENERAL PARTNER
- ---------------

   Orion Satellite Corporation          $30,000,000     (consisting    of    the
   2440 Research Blvd, Suite 400        assignment  of the rights of the General
   Rockville, MD 20850-3238             Partner to use, sell, lease or otherwise
                                        convey the  communications  transmission
                                        capacity on the  satellite  system which
                                        is the  subject  of the FCC  license  to
                                        construct   and  operate  two   in-orbit
                                        satellites    at    37.5(degree)    West
                                        Longitude and 47(degree)  West Longitude
                                        held  by  the   General   Partner,   but
                                        excluding  the  assignment  of  any  FCC
                                        construction   permit  or  license  with
                                        respect to said satellite system,  under
                                        the authorizations by other governments,
                                        and  under  its  IFRB  registration  and
                                        under the INTELSAT consultation; certain
                                        contract rights; and certain other      
                                        tangible and intangible assets).        

LIMITED PARTNERS
- ----------------

   Martin Marietta Commercial           $10,000,000
    Launch Services, Inc.
   9444 Balboa Avenue, Suite 200
   San Diego, CA 92123

   British Aerospace                    $30,000,000
    Communications, Inc.
   Suite 500
   13873 Park Center Road
   Herndon, Virginia  22071

                                      A-1
<PAGE>



                                                             SCHEDULE A (Cont'd)
                                                             -------------------



                             NAMES AND ADDRESSES AND
                        CAPITAL CONTRIBUTIONS OF PARTNERS
                        ---------------------------------


LIMITED PARTNERS
- ----------------

   MCN Sat U.S., Inc.                   $10,000,000
   c/o Matra Aerospace
   1735 Jefferson Davis Highway
   Suite 807
   Arlington, VA  22202


   Trans-Atlantic Satellite, Inc.       $10,000,000
   1211 Avenue of the Americas
   41st Floor
   New York, NY  10036


   Kingston Communications              $ 5,000,000
      International Limited
   Telephone House
   Carr Lane
   Kingston-upon-Hull
   HU1 3RE
   England


   COM DEV Satellite
       Communications Limited           $ 5,000,000
   155 Sheldon Drive
   Cambridge, Ontario
   Canada N1R 7H6


   Orion Network Systems, Inc.          $18,000,000
   2440 Research Blvd, Suite 400
   Rockville, MD  20850-3238


                                      A-2


<PAGE>
                                                                      SCHEDULE B
                                                                      ----------




                        PERCENTAGE INTERESTS OF PARTNERS
                        --------------------------------


GENERAL PARTNER
- ---------------

        Orion Satellite Corporation                            25.00%


LIMITED PARTNERS
- ----------------

        Martin Marietta Commercial                              8.33%
          Launch Services, Inc.


        British Aerospace25.00%
          Com
        MCN Sat U.S., Inc.                                      8.33%


        Trans-Atlantic Satellite, Inc.                          8.33%


        Kingston Communications                                 4.17%
           International Limited


        COM DEV Satellite                                       4.17%
           Communications Limited


        Orion Network Systems, Inc.                            16.66%
                                                               ------ 

Total                                                         100.00%

                                      B-1

<PAGE>





                                                                       EXHIBIT A
                                                                       ---------


                               TEN YEAR PROJECTION
                               -------------------



<PAGE>




                                                                         Annex 1
                                                                         -------


                           Agreements Being Terminated
                           ---------------------------


1.                Service  Provision  and  Representative  Agent  Agreement  for
                  Eastern  Europe,  dated as of  August  7,  1991,  as  amended,
                  between  the  Partnership  and STET,  and  assigned by STET to
                  Telecom  Italia (or a predecessor  thereof) as of December 21,
                  1993.

2.                First Refusal Agreement for Italy, dated as of August 7, 1991,
                  by and between the  Partnership and STET, and assigned by STET
                  to Telecom  Italia (or a  predecessor  thereof) as of December
                  21, 1993.

3.                Service Provision and Distribution  Agreement for Italy, dated
                  as of August 7, 1991, by and between the Partnership and STET,
                  as  amended,  and  assigned  by STET to  Telecom  Italia (or a
                  predecessor thereof) as of December 21, 1993.

4.                Representative  Agent  Agreement  for the  Sale  of  Satellite
                  Capacity  in Eastern  Europe,  dated  August 7,  1991,  by and
                  between the Partnership and STET, as amended,  and assigned by
                  STET  to  Telecom  Italia  (or a  predecessor  thereof)  as of
                  December 21, 1993.

5.                Side  Agreement for Eastern  Europe,  dated as of December 20,
                  1991,  by and  among  the  Partnership,  STET and the  Limited
                  Partners,  and  assigned  by  STET  to  Telecom  Italia  (or a
                  predecessor thereof) as of December 21, 1993.

6.                Side  Agreement  for Italy,  dated  December 20, 1991,  by and
                  among the  Partnership,  STET and the  Limited  Partners,  and
                  assigned by STET to Telecom Italia (or a predecessor  thereof)
                  as of December 21, 1993.

7.                Option  Agreement,  dated  as of  December  22,  1991,  by and
                  between  the  Partnership  and  STET and  assigned  by STET to
                  Telecom Italia (or a predecessor  thereof), as of December 21,
                  1993.

8.                Subscription  Agreement,  dated as of August 7,  1991,  by and
                  between OrionSat and STET.

9.                Consulting  Agreement,  dated as of  August  2,  1991,  by and
                  between the Partnership and Telespazio S.p.A., and assigned by
                  STET  to  Telecom  Italia  (or a  predecessor  thereof)  as of
                  December 21, 1993.

10.               Agreement on Letter of Credit,  dated as of December 20, 1991,
                  by and among the Partnership, OrionSat, Orion and STET.



<PAGE>



                                                                         Annex 2
                                                                         -------

                            Agreements Being Modified
                  to Remove STET (or Telecom Italia) as a Party
                  ---------------------------------------------


1.                Amended and Restated Preferred Bidders Agreement,  dated as of
                  December 20,  1991,  by and among the  Partnership,  OrionSat,
                  STET and the Limited  Partners and assigned by STET to Telecom
                  Italia (or a predecessor thereof) as of December 21, 1993.

2.                Agreement  of  Principles,  dated as of April 2, 1992,  by and
                  among  the  Partnership,   OrionSat,   STET  and  the  Limited
                  Partners,  and  assigned  by  STET  to  Telecom  Italia  (or a
                  predecessor thereof) as of December 21, 1993, which superseded
                  the earlier "Amended and Restated Agreement in Principle."

3.                Consent and Agreement, dated as of December 20, 1991, relating
                  to certain sales of  partnership  interests,  by and among the
                  Partnership, STET and the Limited Partners.






<PAGE>



                                                                         Annex 3
                                                                         -------

                            Agreements Being Modified
                               As Specified Herein
                               -------------------


1.                Communications  Satellite  Capacity  Agreement,  dated  as  of
                  October 22, 1991, by and between the  Partnership and STET and
                  assigned by STET to Telecom Italia (or a predecessor  thereof)
                  as of December 21, 1993:  modifications  regarding a change in
                  Telecom   Italia's   selected   capacity  and  change  in  the
                  termination   date  to  December  31,  1997  (subject  to  the
                  completion of a bond financing,  bank loan  refinancing,  bank
                  approval  or   occurrence  of  other   conditions   permitting
                  termination under existing  agreements between the Partnership
                  and its senior  lenders),  with  certain  options  for Telecom
                  Italia to extend the term,  with respect to part or all of the
                  capacity covered thereby, through December 31, 1999.

2.                Contingent Communications Satellite Capacity Agreement,  dated
                  as of October 22,  1991,  by and between the  Partnership  and
                  STET and assigned by STET to Telecom  Italia (or a predecessor
                  thereof)  as of  December  21,  1993:  modifications  to cause
                  termination to occur upon the completion of a bond  financing,
                  bank loan  refinancing,  bank  approval or occurrence of other
                  conditions  permitting  termination under existing  agreements
                  between the Partnership and its senior lenders.

3.                Italian Facility and Services Agreement, dated as of August 2,
                  1991,  by and  between  OrionSat  and  Telespazio  S.p.A.,  as
                  amended by the  amendment  thereto,  dated  March 19, 1994 and
                  assigned to Telecom  Italia (or a  predecessor  thereof) as of
                  December 21, 1993:  modifications  regarding  revisions to the
                  statement of work, reduction of the payment obligations of the
                  Partnership by  approximately  $1.5 million and changes to the
                  ratio  for  payments  by  the  Partnership  between  cash  and
                  capacity credits.

4.                Telespazio  Communications  Capacity  Agreement  dated  as  of
                  August 2, 1991 by and between the  Partnership  and Telespazio
                  S.p.A.:  modification regarding use of capacity credits earned
                  pursuant  to  the  Italian  Facility  and  Services  Agreement
                  referred to in item 3 of this Annex 3.

5.                STET-IPSP  Agreement,  dated as of December 25,  1991,  by and
                  among  the  Partnership,   OrionSat,   STET  and  the  Limited
                  Partners:  modifications  to  provide  that  Section 2 thereof
                  (limitations on financial exposure),  will survive, Sections 3
                  through 7 will not survive and the remaining  provisions  will
                  survive only to the extent they relate to surviving provisions
                  or agreements.






                          CERTIFICATE OF INCORPORATION
                                       OF
                                 ORIONNET, INC.

                  FIRST:   The  name  of  the  Corporation  is  OrionNet,   Inc.
(hereinafter called the "Corporation").

                  SECOND:  The registered office of the Corporation in the State
of  Delaware is  Corporation  Trust  Center,  1209  Orange  Street,  Wilmington,
Delaware 19801,  County of New Castle. The name of the Corporation's  registered
agent at said address is The Corporation Trust Company.

                  THIRD:  The  purpose  of the  Corporation  is to engage in any
lawful acts or  activities  for which  corporations  may be organized  under the
General Corporation Law of Delaware.

                  FOURTH:  The  total  number  of  shares  of  stock  which  the
Corporation  shall have the authority to issue is One Thousand (1,000) shares of
Common Stock, all of one class, having a par value of $.01 per share.

                  FIFTH:  The name and mailing address of the incorporator is C.
Elliott Bardsley, 1350 Piccard Drive, Rockville, MD 20850 (the "Incorporator").

                  SIXTH: The powers of the Incorporator shall terminate upon the
filing of this Certificate of Incorporation,  and the following persons,  having
the  indicated  mailing  addresses,   shall  serve  as  the  directors,  of  the
Corporation   until  the  first  annual  meeting  of  the  stockholders  of  the
Corporation or until successor or successors are elected and qualify:

<PAGE>





               Name                              Mailing Address
               ----                              ---------------
John G. Puente                                1350 Piccard Drive
                                              Rockville, Maryland  20850

Christopher J. Vizas, II                      1835 K Street, N.W., Suite 201
                                              Washington, DC  20006

C. Elliott Bardsley                           1350 Piccard Drive
                                              Rockville, Maryland  20850

                  SEVENTH:  The number of directors of the Corporation  shall be
such  number as from time to time shall be fixed by, or in the  manner  provided
in, the  by-laws of the  Corporation.  Unless and except to the extent  that the
by-laws of the Corporation shall otherwise require, the election of directors of
the Corporation need not be by written ballot.

                  EIGHTH:  In  furtherance  and not in  limitation of the powers
conferred  by the laws of the State of  Delaware,  the Board of Directors of the
Corporation  is expressly  authorized  and empowered to adopt,  amend and repeal
by-laws of the Corporation.

                  NINTH: No director of the  Corporation  shall be liable to the
Corporation  or its  stockholders  for monetary  damages for breach of fiduciary
duty as a director,  provided that nothing contained in this Article Ninth shall
eliminate  or limit  the  liability  of a  director  (i) for any  breach  of the
director's duty of loyalty to the Corporation or its stockholders, (ii) for acts
or omissions  not in good faith or which  involve  intentional  misconduct  or a
knowing  violation  of law,  (iii)  under  Section 174 of the  Delaware  General
Corporation  Law, or (iv) for any transaction from which the director derived an
improper personal benefit.

<PAGE>




                  TENTH:  The  Corporation  reserves the right at any time,  and
from time to time, to amend, alter, change or repeal any provisions contained in
this Certificate or Incorporation,  and other provisions  authorized by the laws
of the State of  Delaware  at a time in force may be added or  inserted,  in the
manner now or  hereafter  prescribed  by law;  and all rights,  preferences  and
privileges of whatsoever  nature conferred upon  stockholders,  directors or any
other persons whomsoever by and pursuant to this Certificate of Incorporation in
its present  form or as  hereafter  amended  are  granted  subject to the rights
reserved in this  contained  in this  Certificate  or  Incorporation,  and other
provisions  authorized  by the laws of the State of  Delaware at a time in force
may be added or inserted,  in the manner now or hereafter prescribed by law; and
all rights,  preferences  and  privileges of whatsoever  nature  conferred  upon
stockholders,  directors or any other persons whomsoever by and pursuant to this
Certificate  of  Incorporation  in its present form or as hereafter  amended are
granted subject to the rights reserved in this Article Tenth.

                  IN WITNESS WHEREOF,  the  undersigned,  being the Incorporator
hereinabove  named,  for the  purpose of forming a  corporation  pursuant to the
General  Corporation  Law of the State of Delaware,  hereby  certifies  that the
facts hereinabove  stated are truly set forth, and accordingly,  I have hereunto
set my hand this 15 day of January, 1988.

                                    /S/ C.Elliot Bardsley
                                    ------------------------
                                    C. Elliott Bardsley

                                     BY-LAWS

                                       OF

                                 ORIONNET, INC.



1.       Offices.

                  1.1  Registered   Office.   The   registered   office  of  the
corporation shall be in the City of Wilmington,  County of New Castle,  State of
Delaware,  and the registered  agent in charge thereof shall be The  Corporation
Trust  Company,  Corporation  Trust  Center,  1209  Orange  Street,  Wilmington,
Delaware 19801.
                  1.2 Other Offices.  The  corporation  may also have offices at
such other places,  both within and without the State of Delaware,  as the board
of directors may from time to time determine or the business of the  corporation
may require.

2.       Meetings of Stockholders.

                  2.1 Place of Meetings.  All meetings of the  stockholders  for
the election of directors shall be held in Washington, D.C. at such place as may
be fixed from time to time by the board of  directors,  or at such other  place,
within or without the State of  Delaware,  as shall be  designated  from time to
time by the board of  directors  and stated in the notice of the meeting or in a
duly executed waiver of notice thereof.  Meetings of stockholders  for any other
purpose may be held at such time and place, within or without the

<PAGE>



State of Delaware,  as shall be stated in the notice of the meeting or in a duly
executed waiver of notice thereof.

                  2.2  Annual   Meetings.   Annual  meetings  of   stockholders,
commencing  with the year 1988,  shall be held on the first  Thursday of May, if
not a legal  holiday,  and if a legal  holiday,  then on the  next  secular  day
following,  at 10:00 a.m., or at such other date and time as shall be designated
from  time to time by the board of  directors  and  stated in the  notice of the
meeting or in a duly executed  waiver of notice thereof,  at which  stockholders
shall  elect a board of  directors  and  transact  such  other  business  as may
properly be brought before the meeting.

                  2.3 Special  Meetings.  Special meetings of the  stockholders,
for any purpose or purposes,  unless  otherwise  prescribed by statute or by the
certificate of incorporation,  may be called by the board of directors or by the
president,  and shall be called by the  president or secretary at the request in
writing of stockholders  owning a majority in amount of the entire capital stock
of the  corporation  issued and  outstanding  and entitled to vote. Such request
shall include a statement of the purpose or purposes of the proposed meeting.

                  2.4 Notice of Meetings.  Written notice of the annual meeting,
stating  the  place,  date  and  hour of the  meeting,  shall  be  given to each
stockholder  entitled  to vote at such  meeting  not less than ten nor more than
sixty days before the date of the meeting. Written notice of a special meeting

<PAGE>



of stockholders, stating the place, date and hour of the meeting and the purpose
or purposes for which the meeting is called,  shall be given to each stockholder
entitled  to vote at such  meeting  not less than ten nor more than  sixty  days
before the date of the meeting.


                  2.5 Business at Special Meetings.  Business  transacted at any
special meeting of  stockholders  shall be limited to the purposes stated in the
notice.

                  2.6 List of  Stockholders.  The  officer who has charge of the
stock ledger of the corporation shall prepare and make, at least ten days before
every meeting of stockholders,  a complete list of the stockholders  entitled to
vote at the meeting,  arranged in alphabetical  order and showing the address of
each  stockholder  and the  number  of  shares  registered  in the  name of each
stockholder.  Such list shall be open to the examination of any stockholder, for
any purpose germane to the meeting, during ordinary business hours, for a period
of at least ten days  prior to the  meeting,  either at a place  within the city
where the meeting is to be held, which place shall be specified in the notice of
the meeting,  or, if not so  specified,  at the place where the meeting is to be
held.  The list  shall  also be  produced  and kept at the time and place of the
meeting during the whole time thereof,  and may be inspected by any  stockholder
who is present.  The stock ledger  shall be the only  evidence as to who are the
stockholders  entitled to examine the stock  ledger,  the list  required by this
section or the books of the corporation, or to vote in person or by proxy at any
meeting of stockholders.

<PAGE>



                  2.7  Quorum at  Meetings.  Except  as  otherwise  provided  by
statute or by the certificate of incorporation, the holders of a majority of the
stock issued and outstanding and entitled to vote thereat,  present in person or
represented  by  proxy,  shall  constitute  a  quorum  at  all  meetings  of the
stockholders for the transaction of business. If, however, such quorum shall not
be  present  or  represented  at  any  such  meeting  of the  stockholders,  the
stockholders  entitled  to vote  thereat,  present in person or  represented  by
proxy, shall have power to adjourn the meeting from time to time to another time
and place,  without notice other than  announcement at the meeting of such other
time and place.  At the adjourned  meeting at which a quorum shall be present or
represented,  any business may be transacted which might have been transacted at
the original  meeting.  If the  adjournment  is for more than thirty days, or if
after the  adjournment a new record date is fixed for the adjourned  meeting,  a
notice of the  adjourned  meeting shall be given to each  stockholder  of record
entitled to vote at the meeting.

                  2.8 Voting  and  Proxies.  Unless  otherwise  provided  in the
certificate  of  incorporation,  and subject to the provisions of Section 6.4 of
these by-laws, each stockholder shall be entitled to one vote on each matter, in
person or by proxy,  for each share of the  corporation's  capital  stock having
voting power which is held by such stockholder. No proxy shall be voted or acted
upon after three  years from its date,  unless the proxy  provides  for a longer
period.  A duly  executed  proxy  shall be  irrevocable  if it states that it is
irrevocable and if, and only as long as, it is coupled with an interest

<PAGE>



sufficient  in  law to  support  an  irrevocable  power.  A  proxy  may be  made
irrevocable  regardless  of whether the interest  with which it is coupled is an
interest in the stock itself or an interest in the corporation generally.

                  2.9 Required Vote.  When a quorum is present at any meeting of
stockholders,  all matters shall be determined, adopted and approved by the vote
(which  need not be by ballot) of a majority  of the votes cast with  respect to
the matter,  unless the proposed action is one upon which, by express  provision
of  statutes  or of the  certificate  of  incorporation,  a  different  vote  is
specified and required,  in which case such express  provision  shall govern and
control the decision of such question. Notwithstanding the foregoing, candidates
for election as members of the board of directors who receive the highest number
of votes, up to the number of directors to be chosen,  shall stand elected,  and
an  absolute  majority  of the votes  cast  shall not be a  prerequisite  to the
election of any candidate to the board of directors.

                  2.10 Action Without a Meeting.  Unless  otherwise  provided in
the certificate of incorporation,  any action required to be taken at any annual
or special meeting of stockholders of the  corporation,  or any action which may
be taken at any annual or special  meeting  of such  stockholders,  may be taken
without a meeting,  without  prior  notice and  without a vote,  if a consent in
writing,  setting  forth  the  action so taken,  is  signed  by the  holders  of
outstanding stock having not less than the minimum number of votes that would be
necessary  to  authorize  or take such  action at a meeting  at which all shares
entitled to vote thereon were present and voted. Prompt notice of the

<PAGE>



taking of the corporate action without a meeting by less than unanimous  written
consent  shall be given to those  stockholders  who shall not have  consented in
writing.

3.       Directors.

                  3.1 Powers.  The business and affairs of the corporation shall
be  managed  by or under  the  direction  of the board of  directors,  which may
exercise  all such  powers of the  corporation  and do all such  lawful acts and
things as are not by statute or by the certificate of  incorporation or by these
by-laws directed or required to be exercised or done by the stockholders.

                  3.2 Number and Election.  The number of directors  which shall
constitute  the whole  board  shall not be less than one nor more than ten.  The
first  board shall  consist of three  directors.  Thereafter,  within the limits
above  specified,  the number of directors  shall be determined by resolution of
the board of directors.  The directors shall be elected at the annual meeting of
the  stockholders,  except as provided in Section 3.3 hereof,  and each director
elected  shall hold office until his successor is elected and qualified or until
his earlier resignation or removal. Directors need not be stockholders.

                  3.3  Vacancies.  Vacancies  and  newly  created  directorships
resulting from any increase in the authorized  number of directors may be filled
by a majority of the directors then in office,  although less than a quorum,  or
by a sole  remaining  director,  and each  director so chosen  shall hold office
until the next annual election and until his successor is elected

<PAGE>



and  qualified,  or until his earlier  resignation  or removal.  If there are no
directors  in office,  then an election of  directors  may be held in the manner
provided by statute. If, at the time of filling any vacancy or any newly created
directorship,  the directors then in office  constitute  less than a majority of
the whole board (as constituted  immediately  prior to any such  increase),  the
Court of  Chancery  of the  State  of  Delaware  may,  upon  application  of any
stockholder or stockholders  holding at least ten percent of the total number of
the then  outstanding  shares  having  the  right  to vote  for such  directors,
summarily  order an  election  to be held to fill any  such  vacancies  or newly
created directorships,  or to replace the directors chosen by the directors then
in  office,  in  accordance  with the  General  Corporation  Law of the State of
Delaware.  In the  event  that one or more  directors  resigns  from the  board,
effective  at a  future  date,  a  majority  of the  directors  then in  office,
including  those who have so resigned,  shall have power to fill such vacancy or
vacancies, the vote thereon to take effect when such resignation or resignations
shall become effective,  and each director so chosen shall hold office until the
next annual election and until his successor is elected and qualified,  or until
his earlier resignation or removal.

                  3.4  Place  of  Meetings.   The  board  of  directors  of  the
corporation  may hold  meetings,  both  regular and  special,  either  within or
without the State of Delaware.


                  3.5 First  Meeting of Each  Board.  The first  meeting of each
newly elected board of directors shall be held at such time and place as shall

<PAGE>



be specified in a notice given as hereinafter  provided for special  meetings of
the board of directors,  or as shall be specified in a written  waiver of notice
signed by all of the directors.

                  3.6  Regular  Meetings.  Regular  meetings  of  the  board  of
directors  may be held  without  notice at such time and at such  place as shall
from time to time be determined by the board of directors.

                  3.7  Special  Meetings.  Special-meetings  of the board may be
called by the president on one day's notice to each director,  either personally
or by telephone, by mail or by telegram; special meetings shall be called by the
president or secretary in like manner and on like notice on the written  request
of one-third of the total number of directors.

                  3.8 Quorum and Vote at Meetings. At all meetings of the board,
one director if a board of one director is authorized, or such greater number of
directors as is not less than a majority of the total number of directors, shall
constitute a quorum for the  transaction of business.  The vote of a majority of
the directors present at any meeting at which there is a quorum shall be the act
of the board of directors,  except as may be otherwise  specifically provided by
statute or by the certificate of incorporation. If a quorum shall not be present
at any meeting of the board of  directors,  the  directors  present  thereat may
adjourn  the  meeting  to  another  time and place,  without  notice  other than
announcement at the meeting of such other time and place.

<PAGE>



                  3.9 Telephone  Meetings.  Members of the board of directors or
any committee designated by the board may participate in a meeting of such board
or  committee  by  means  of  conference  telephone  or  similar  communications
equipment  by means of which all persons  participating  in the meeting can hear
each  other,  and  participation  in a meeting  pursuant to this  section  shall
constitute presence in person at such meeting.

                  3.10 Action Without Meeting.  Unless  otherwise  restricted by
the  certificate  of  incorporation  or these  by-laws,  any action  required or
permitted  to be taken  at any  meeting  of the  board  of  directors  or of any
committee thereof may be taken without a meeting, if all members of the board or
committee,  as the case may be, consent  thereto in writing,  and the writing or
writings are filed with the minutes of  proceedings of the board of directors or
committee.

                  3.11  Committees of  Directors.  The board of directors may by
resolution  passed by a  majority  of the  whole  board,  designate  one or more
committees,  each  committee  to consist of one or more of the  directors of the
corporation.  The board may designate one or more directors as alternate members
of any  committee,  who may  replace  any absent or  disqualified  member at any
meeting of the  committee.  If a member of a committee  shall be absent from any
meeting,  or disqualified  from voting thereat,  the remaining member or members
present and not disqualified from voting,  whether or not such member or members
constitute a quorum, may, by unanimous vote, appoint another member of the board
of directors to act at

<PAGE>



the  meeting  in the  place of such  absent  or  disqualified  member.  Any such
committee,  to the extent  provided in the resolution of the board of directors,
shall  have and may  exercise  all the  powers  and  authority  of the  board of
directors in the management of the business and affairs of the corporation,  and
may authorize the seal of the  corporation to be affixed to all papers which may
require it; but no such committee shall have the power or authority in reference
to amending the  certificate of  incorporation  (except that a committee may, to
the  extent  authorized  in the  resolution  or  resolutions  providing  for the
issuance  of  shares of stock  adopted  by the board of  directors  pursuant  to
Section  151(a)  of  the  General  Corporation  Law  of the  State  of  Delaware
[hereinafter  the "GCL"],  fix any of the  preferences  or rights of such shares
relating to dividends,  redemption,  dissolution,  any distribution of assets of
the  corporation  or the  conversion  into,  or the exchange of such shares for,
shares  of any other  class or  classes  or any other  series of the same or any
other class or classes of stock of the  corporation),  adopting an  agreement of
merger or consolidation pursuant to Sections 251 or 252 of the GCL, recommending
to the stockholders  the sale, lease or exchange of all or substantially  all of
the  corporation's  property  and assets,  recommending  to the  stockholders  a
dissolution of the corporation or a revocation of a dissolution, or amending the
by-laws of the  corporation;  and, unless  otherwise  expressly  provided in the
resolution,  no such  committee  shall have the power or  authority to declare a
dividend, to authorize the

<PAGE>



issuance of stock, or to adopt a certificate of ownership and merger pursuant to
Section 253 of the GCL.  Such  committee or  committees  shall have such name or
names as may be determined from time to time by resolution  adopted by the board
of  directors.  Unless  otherwise  specified in the  resolution  of the board of
directors  designating the committee,  at all meetings of each such committee of
directors,  a majority  of the total  number of members of the  committee  shall
constitute a quorum for the transaction of business,  and the vote of a majority
of the  members  of the  committee  present at any  meeting at which  there is a
quorum  shall be the act of the  committee.  Each  committee  shall keep regular
minutes of its  meetings  and report  the same to the board of  directors,  when
required.

                  3.12 Compensation of Directors. Unless otherwise restricted by
the  certificate  of  incorporation,  the  board  of  directors  shall  have the
authority to fix the compensation of directors.  The directors may be paid their
expenses,  if any, of  attendance  at each meeting of the board of directors and
may be paid a fixed sum for attendance at each meeting of the board of directors
or a stated salary as director. No such payment shall preclude any director from
serving  the  corporation  in any  other  capacity  and  receiving  compensation
therefor.   Members  of  special  or  standing   committees  may  be  paid  like
compensation for attending committee meetings.

<PAGE>



 4.       Notices of Meetings.

                  4.1 Notice Procedure.  Whenever,  whether under the provisions
of any  statute or of the  certificate  of  incorporation  or of these  by-laws,
notice is required to be given to any director or stockholder,  such requirement
shall not be construed to require the giving of personal notice. Such notice may
be given in writing, by mail, addressed to such director or stockholder,  at his
address as it appears on the records of the  corporation,  with postage  thereon
prepaid,  and such notice  shall be deemed to be given at the time when the same
is deposited in the United States mail. Notice to directors may also be given by
telex, telegram or telephone.

                  4.2  Waivers of Notice.  Whenever  the giving of any notice is
required by statute, the certificate of incorporation or these by-laws, a waiver
thereof,  in writing,  signed by the person or persons  entitled to said notice,
whether before or after the event as to which such notice is required,  shall be
deemed  equivalent  to  notice.  Attendance  of  a  person  at a  meeting  shall
constitute a waiver of notice of such meeting,  except when the person attends a
meeting for the express  purpose of objecting,  at the beginning of the meeting,
to the transaction of any business because the meeting is not lawfully called or
convened.  Neither  the  business to be  transacted  at, nor the purpose of, any
regular  or  special  meeting  of the  stockholders,  directors  or members of a
committee of directors need be specified in any written waiver of notice, unless
so required by the certificate of incorporation, by statute or by these by-laws.

<PAGE>



5.       Officers.

                  5.1  Positions.  The  officers of the  corporation  shall be a
president, a secretary and a treasurer,  and such other officers as the board of
directors may appoint,  including a chairman of the board,  and one or more vice
presidents,  assistant secretaries and assistant treasurers,  who shall exercise
such powers and perform such duties as shall be determined  from time to time by
the  board.  Any number of offices  may be held by the same  person,  unless the
certificate  of  incorporation  or these by-laws  otherwise  provide;  provided,
however,  that in no event shall the  president  and the  secretary  be the same
person.

                  5.2  Appointment.  The  officers of the  corporation  shall be
chosen by the board of directors at its first meeting after each annual  meeting
of stockholders.

                  5.3  Compensation.  The  compensation  of all  officers of the
corporation shall be fixed by the board of directors.

                  5.4 Term of Office. The officers of the corporation shall hold
office  until their  successors  are chosen and  qualify or until their  earlier
resignation  or removal.  Any officer may resign at any time upon written notice
to the  corporation.  Any officer elected or appointed by the board of directors
may be removed at any time, with or without cause, by the affirmative  vote of a
majority of the board of directors.  Any vacancy  occurring in any office of the
corporation shall be filled by the board of directors.

<PAGE>



                  5.5 Fidelity Bonds. The corporation may secure the fidelity of
any or all of its officers or agents by bond or otherwise.

                  5.6  President.  The  president  shall be the chief  executive
officer  of the  corporation,  shall  be ex  officio  a member  of all  standing
committees,  shall have  general and active  management  of the  business of the
corporation,  shall  ensure  that all  orders  and  resolutions  of the board of
directors are carried into effect,  and, unless otherwise  provided by the board
of directors, shall preside at all meetings of the stockholders and the board of
directors.  The president  shall execute  bonds,  mortgages and other  contracts
requiring a seal,  under the seal of the  corporation,  except where required or
permitted  by law to be  otherwise  signed and  executed  and  except  where the
signing and  execution  thereof  shall be  expressly  delegated  by the board of
directors to some other officer or agent of the corporation.

                  5.7 Vice President.  In the absence of the president or in the
event of the president's  inability or refusal to act, the vice president (or in
the event  there be more than one vice  president,  the vice  presidents  in the
order  designated,  or in the absence of any  designation,  then in the order of
their  election)  shall perform the duties of the president,  and when so acting
shall have all the powers of, and be subject to all the  restrictions  upon, the
president.  The vice  presidents  shall  perform such other duties and have such
other powers as the board of directors may from time to time prescribe.

                  5.8 Chairman of the Board.  If the  directors  shall appoint a
chairman of the board, the chairman shall, when present, preside at all

<PAGE>



meetings of the board of directors  and shall perform such other duties and have
such other powers as may be vested in the chairman by the board of directors.

                  5.9 Secretary.  The secretary shall attend all meetings of the
board of directors  and all meetings of the  stockholders,  and shall record all
the  proceedings  of the  meetings  of the  stockholders  and  of the  board  of
directors in a book to be kept for that  purpose,  and shall perform like duties
for the standing committees,  when required.  The secretary shall give, or cause
to be given,  notice of all meetings of the stockholders and special meetings of
the board of directors, and shall perform such other duties as may be prescribed
by the board of  directors  or by the  president,  under whose  supervision  the
secretary  shall be. The secretary  shall have custody of the corporate  seal of
the  corporation,  and the  secretary,  or an  assistant  secretary,  shall have
authority to affix the same to any instrument  requiring it, and when so affixed
it may be attested by the signature of the secretary or by the signature of such
assistant  secretary.  The board of directors may give general  authority to any
other officer to affix the seal of the corporation and to attest the affixing by
such  officer's  signature.  The  secretary or an assistant  secretary  may also
attest all instruments signed by the chairman of the board, the president or any
vice president.

                  5.10 Assistant Secretary. The assistant secretary, or if there
be more than one, the assistant secretaries in the order determined by the board
of directors (or if there shall have been no such determination, then in

<PAGE>



the order of their  election),  shall, in the absence of the secretary or in the
event of the  secretary's  inability  or refusal to act,  perform the duties and
exercise the powers of the  secretary,  and shall  perform such other duties and
have  such  other  powers  as the  board  of  directors  may  from  time to time
prescribe.

5.11     Treasurer.

                  5.11.1  Duties.  The  treasurer  shall have the custody of the
corporate  funds and  securities  and shall keep full and  accurate  accounts of
receipts and  disbursements  in books  belonging to the  corporation,  and shall
deposit all moneys and other  valuable  effects in the name and to the credit of
the  corporation  in such  depositories  as may be  designated  by the  board of
directors.  The treasurer shall disburse the funds of the corporation as ordered
by the board of directors,  taking proper vouchers for such  disbursements,  and
shall  render to the  president,  and to the board of  directors  at its regular
meetings,  or when  the  board of  directors  so  requires,  an  account  of all
transactions as treasurer and of the financial condition of the corporation.

                  5.11.2  Bond.  If  required  by the  board of  directors,  the
treasurer  shall give the corporation a bond in such sum and with such surety or
sureties as shall be  satisfactory  to the board of  directors  for the faithful
performance of the duties of the  treasurer's  office and for the restoration to
the corporation,  in case of the treasurer's death,  resignation,  retirement or
removal from office, of all books, papers, vouchers, money and other property

<PAGE>



of whatever kind, in the treasurer's possession or under the treasurer's control
and belonging to the corporation.

                  5.12 Assistant Treasurer. The assistant treasurer, or if there
shall be more than one, the assistant  treasurers in the order determined by the
board of directors (or if there shall have been no such  determination,  then in
the order of their  election),  shall, in the absence of the treasurer or in the
event of the  treasurer's  inability  or refusal to act,  perform the duties and
exercise the powers of the  treasurer,  and shall  perform such other duties and
have  such  other  powers  as the  board  of  directors  may  from  time to time
prescribe.

6.       Capital Stock.

                  6.1 Certificates of Stock;  Uncertificated  Shares. The shares
of the corporation shall be represented by certificates, provided that the board
of directors may provide by resolution or resolutions that some or all of any or
all classes or series of the corporation's stock shall be uncertificated shares.
Any such resolution shall not apply to shares represented by a certificate until
such certificate is surrendered to the corporation. Notwithstanding the adoption
of  such a  resolution  by  the  board  of  directors,  every  holder  of  stock
represented  by  certificates  and upon request  every holder of  uncertificated
shares shall be entitled to have a certificate  signed by, or in the name of the
corporation  by the chairman or vice chairman of the board of directors,  or the
president or vice president, and by the treasurer

<PAGE>



and/or assistant  treasurer,  or the secretary or an assistant secretary of such
corporation  representing the number of shares  registered in certificate  form.
Any or all the  signatures  on the  certificate  may be  facsimile.  In case any
officer,  transfer  agent or registrar  whose  signature or facsimile  signature
appears on a certificate shall have ceased to be such officer, transfer agent or
registrar before such certificate is issued, it may be issued by the corporation
with the same  effect as if such  person were such  officer,  transfer  agent or
registrar at the date of issue.

                  6.2 Lost Certificates. The board of directors may direct a new
certificate or  certificates of stock or  uncertificated  shares to be issued in
place of any certificate or certificates  theretofore  issued by the corporation
and  alleged  to have been  lost,  stolen or  destroyed,  upon the  making of an
affidavit of that fact by the person  claiming that the certificate of stock has
been  lost,  stolen  or  destroyed.  When  authorizing  such  issuance  of a new
certificate or  certificates,  the board of directors may, in its discretion and
as a condition  precedent  to the  issuance  thereof,  require the owner of such
lost,  stolen or destroyed  certificate or  certificates,  or such owner's legal
representative,  to advertise the same in such manner as the board shall require
and/or to give the  corporation a bond, in such sum as the board may direct,  as
indemnity  against any claim that may be made against the corporation on account
of the certificate  alleged to have been lost, stolen or destroyed or on account
of the issuance of such new certificate or uncertificated shares.

<PAGE>



                  6.3  Transfers.  The transfer of stock and  certificates  that
represent the stock and the transfer of uncertificated  shares shall be effected
in accordance  with the laws of the State of Delaware.  Any  restriction  on the
transfer of a security imposed by the corporation  shall be noted  conspicuously
on the security.

                  6.4 Fixing  Record  Date.  In order that the  corporation  may
determine the stockholders  entitled to notice of, or to vote at, any meeting of
stockholders  or any  adjournment  thereof,  or to express  consent to corporate
action in  writing  without a meeting,  or  entitled  to receive  payment of any
dividend  or other  distribution  or  allotment  of any  rights,  or entitled to
exercise any rights in respect of any change, conversion or exchange of stock or
for the purpose of any other lawful  action,  the board of directors may fix, in
advance,  a record  date,  which  shall not be more than sixty nor less than ten
days  before  the date of such  meeting,  nor more than  sixty days prior to any
other action.  A determination  of stockholders of record entitled to notice of,
or to vote at, a meeting of  stockholders  shall apply to any adjournment of the
meeting;  provided,  however,  that the board of directors  may fix a new record
date for the adjourned meeting.

                  6.5 Registered Stockholders. The corporation shall be entitled
to recognize  the  exclusive  right of a person  registered  on its books as the
owner of shares to receive dividends, to receive notifications,  to vote as such
owner,  and to  exercise  all  the  rights  and  powers  of an  owner;  and  the
corporation shall not be bound to recognize any equitable or other claim to or

<PAGE>



                  interest  in such  share or  shares  on the part of any  other
person, whether or not it shall have express or other notice thereof,  except as
otherwise provided by the laws of the State of Delaware.

7.       Indemnification.

                  Unless  expressly  prohibited  by law, the  corporation  shall
fully indemnify any person made, or threatened to be made, a party to an action,
suit or proceeding (whether civil, criminal, administrative or investigative) by
reason of the fact that such person, or such person's testator or intestate,  is
or was a director or officer,  employee or agent of the corporation or serves or
served any other  enterprise  at the  request of the  corporation,  against  all
expenses (including attorneys' fees), judgments, fines and amounts paid or to be
paid in settlement incurred in connection with such action, suit or proceeding.

8.       General Provisions.

                  8.1  Dividends.  Dividends  upon  the  capital  stock  of  the
corporation,  subject to the provisions of the certificate of incorporation  and
the laws of the State of Delaware,  may be declared by the board of directors at
any  regular  or  special  meeting.  Subject to the  provisions  of the  General
Corporation Law of the State of Delaware,  such dividends may be paid either out
of surplus,  as defined in the General Corporation Law of the State of Delaware,
or in the event that there shall be no such surplus,  out of the net profits for
the fiscal year in which the dividend is declared and/or the

<PAGE>



preceding fiscal year. Dividends may be paid in cash, in property,  or in shares
of the corporation's  capital stock,  subject to the provisions,  if any, of the
certificate of incorporation.

                  8.2 Reserves.  The directors of the corporation may set apart,
out of the funds of the  corporation  available  for  dividends,  a  reserve  or
reserves for any proper purpose and may abolish any such reserve.

                  8.3 Execution of Instruments.  All checks or demands for money
and notes of the corporation shall be signed by such officer or officers or such
other  person  or  persons  as the  board of  directors  may  from  time to time
designate.

                  8.4 Fiscal Year. The fiscal year of the  corporation  shall be
fixed by resolution of the board of directors.

                  8.5 Seal. The corporate seal shall have inscribed  thereon the
name of the  corporation,  the year of its organization and the words "Corporate
Seal, Delaware". The seal may be used by causing it or a facsimile thereof to be
impressed or affixed or otherwise reproduced.

9.       Amendments.

                  These  by-laws  may be altered,  amended or  repealed  and new
by-laws may be adopted by the board of directors.


                                      * * *

<PAGE>




                  The  foregoing  by-laws were adopted by the board of directors
on January 18, 1988.

                                                     /s/
                                                     Assistant Secretary


  

                                     BY-LAWS

                                       OF

                         ORION ASIA PACIFIC CORPORATION


1.  Offices.
    -------
                1.1 Registered  Office. The registered office of the corporation
shall be in the City of Wilmington, County of New Castle, State of Delaware, and
the registered  agent in charge thereof shall be The Corporation  Trust Company,
Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware 19801.

                1.2 Other Offices. The corporation may also have offices at such
other  places,  both within and without the State of  Delaware,  as the board of
directors may from time to time determine or the business of the corporation may
require.

2.  Meetings of Stockholders.
    ------------------------
                2.1 Place of Meetings.  All meetings of the stockholders for the
election of directors shall be held in Washington,  D.C. at such place as may be
fixed  from  time to time by the board of  directors,  or at such  other  place,
within or without the State of  Delaware,  as shall be  designated  from time to
time by the board of  directors  and stated in the notice of the meeting or in a
duly executed waiver of notice thereof.  Meetings of stockholders  for any other
purpose  may be held at such  time and  place,  within or  without  the State of
Delaware,  as shall be stated in the notice of the meeting or in a duly executed
waiver of notice thereof.

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<PAGE>



                2.2 Annual Meetings. Annual meetings of stockholders, commencing
with the year 1992,  shall be held on the first  Thursday of May, if not a legal
holiday,  and if a legal  holiday,  then on the next secular day  following,  at
10:00 a.m., or at such other date and time as shall be  designated  from time to
time by the board of  directors  and stated in the notice of the meeting or in a
duly executed  waiver of notice  thereof,  at which  stockholders  shall elect a
board of directors and transact  such other  business as may properly be brought
before the meeting.

                2.3 Special Meetings. Special meetings of the stockholders,  for
any  purpose  or  purposes,  unless  otherwise  prescribed  by statute or by the
certificate of incorporation,  may be called by the board of directors or by the
president,  and shall be called by the  president or secretary at the request in
writing of stockholders  owning a majority in amount of the entire capital stock
of the  corporation  issued and  outstanding  and entitled to vote. Such request
shall include a statement of the purpose or purposes of the proposed meeting.

                2.4 Notice of Meetings.  Written  notice of the annual  meeting,
stating  the  place,  date  and  hour of the  meeting,  shall  be  given to each
stockholder  entitled  to vote at such  meeting  not less than ten nor more than
sixty days before the date of the meeting.  Written notice of a special  meeting
of stockholders, stating the place, date and hour of the meeting and the purpose
or purposes for which the meeting is called, shall be given to

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<PAGE>



each  stockholder  entitled  to vote at such  meeting not less than ten nor more
than sixty days before the date of the meeting.

                2.5 Business at Special  Meetings.  Business  transacted  at any
special meeting of  stockholders  shall be limited to the purposes stated in the
notice.

                2.6 List of  Stockholders.  The  officer  who has  charge of the
stock ledger of the corporation shall prepare and make, at least ten days before
every meeting of stockholders,  a complete list of the stockholders  entitled to
vote at the meeting,  arranged in alphabetical  order and showing the address of
each  stockholder  and the  number  of  shares  registered  in the  name of each
stockholder.  Such list shall be open to the examination of any stockholder, for
any purpose germane to the meeting, during ordinary business hours, for a period
of at least ten days  prior to the  meeting,  either at a place  within the city
where the meeting is to be held, which place shall be specified in the notice of
the meeting,  or, if not so  specified,  at the place where the meeting is to be
held.  The list  shall  also be  produced  and kept at the time and place of the
meeting during the whole time thereof,  and may be inspected by any  stockholder
who is present.  The stock ledger  shall be the only  evidence as to who are the
stockholders  entitled to examine the stock  ledger,  the list  required by this
section or the books of the corporation, or to vote in person or by proxy at any
meeting of stockholders.

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<PAGE>



                2.7 Quorum at Meetings.  Except as otherwise provided by statute
or by the certificate of  incorporation,  the holders of a majority of the stock
issued  and  outstanding  and  entitled  to vote  thereat,  present in person or
represented  by  proxy,  shall  constitute  a  quorum  at  all  meetings  of the
stockholders for the transaction of business. If, however, such quorum shall not
be  present  or  represented  at  any  such  meeting  of the  stockholders,  the
stockholders  entitled  to vote  thereat,  present in person or  represented  by
proxy, shall have power to adjourn the meeting from time to time to another time
and place,  without notice other than  announcement at the meeting of such other
time and place.  At the adjourned  meeting at which a quorum shall be present or
represented,  any business may be transacted which might have been transacted at
the original  meeting.  If the  adjournment  is for more than thirty days, or if
after the  adjournment a new record date is fixed for the adjourned  meeting,  a
notice of the  adjourned  meeting shall be given to each  stockholder  of record
entitled to vote at the meeting.

                2.8  Voting  and  Proxies.  Unless  otherwise  provided  in  the
certificate  of  incorporation,  and subject to the provisions of Section 6.4 of
these by-laws, each stockholder shall be entitled to one vote on each matter, in
person or by proxy,  for each share of the  corporation's  capital  stock having
voting power which is held by such stockholder. No proxy shall be voted or acted
upon after three years from its date, unless the proxy

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<PAGE>



provides for a longer  period.  A duly executed proxy shall be irrevocable if it
states that it is irrevocable and if, and only as long as, it is coupled with an
interest  sufficient in law to support an irrevocable power. A proxy may be made
irrevocable  regardless  of whether the interest  with which it is coupled is an
interest in the stock itself or an interest in the corporation generally.

                2.9  Required  Vote.  When a quorum is present at any meeting of
stockholders,  all matters shall be determined, adopted and approved by the vote
(which  need not be by ballot) of a majority  of the votes cast with  respect to
the matter,  unless the proposed action is one upon which, by express  provision
of  statutes  or of the  certificate  of  incorporation,  a  different  vote  is
specified and required,  in which case such express  provision  shall govern and
control the decision of such question. Notwithstanding the foregoing, candidates
for election as members of the board of directors who receive the highest number
of votes, up to the number of directors to be chosen,  shall stand elected,  and
an  absolute  majority  of the votes  cast  shall not be a  prerequisite  to the
election of any candidate to the board of directors.

                2.10 Action Without a Meeting.  Unless otherwise provided in the
certificate of  incorporation,  any action required to be taken at any annual or
special meeting of stockholders of the  corporation,  or any action which may be
taken at any annual

                                      -#-
<PAGE>



or special meeting of such stockholders, may be taken without a meeting, without
prior  notice and  without a vote,  if a consent in writing,  setting  forth the
action so taken,  is signed by the holders of outstanding  stock having not less
than the minimum  number of votes that would be  necessary  to authorize or take
such  action at a meeting  at which all shares  entitled  to vote  thereon  were
present and voted. Prompt notice of the taking of the corporate action without a
meeting  by less  than  unanimous  written  consent  shall  be  given  to  those
stockholders who shall not have consented in writing.

3.      Directors.
        ---------
                3.1 Powers. The business and affairs of the corporation shall be
managed by or under the direction of the board of directors,  which may exercise
all such powers of the corporation and do all such lawful acts and things as are
not by  statute  or by the  certificate  of  incorporation  or by these  by-laws
directed or required to be exercised or done by the stockholders.

                3.2 Number and  Election.  The number of  directors  which shall
constitute  the whole  board  shall not be less than one nor more than ten.  The
first  board shall  consist of three  directors.  Thereafter,  within the limits
above  specified,  the number of directors  shall be determined by resolution of
the board of directors. The directors shall be elected at the annual

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<PAGE>



meeting of the stockholders,  except as provided in Section 3.3 hereof, and each
director  elected shall hold office until his successor is elected and qualified
or until his earlier resignation or removal. Directors need not be stockholders.

                3.3  Vacancies.   Vacancies  and  newly  created   directorships
resulting from any increase in the authorized  number of directors may be filled
by a majority of the directors then in office,  although less than a quorum,  or
by a sole  remaining  director,  and each  director so chosen  shall hold office
until the next annual election and until his successor is elected and qualified,
or until his  earlier  resignation  or  removal.  If there are no  directors  in
office,  then an election  of  directors  may be held in the manner  provided by
statute.  If,  at  the  time  of  filling  any  vacancy  or  any  newly  created
directorship,  the directors then in office  constitute  less than a majority of
the whole board (as constituted  immediately  prior to any such  increase),  the
Court of  Chancery  of the  State  of  Delaware  may,  upon  application  of any
stockholder or stockholders  holding at least ten percent of the total number of
the then  outstanding  shares  having  the  right  to vote  for such  directors,
summarily  order an  election  to be held to fill any  such  vacancies  or newly
created directorships,  or to replace the directors chosen by the directors then
in  office,  in  accordance  with the  General  Corporation  Law of the State of
Delaware.  In the  event  that one or more  directors  resigns  from the  board,
effective at a future

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<PAGE>



date, a majority of the directors  then in office,  including  those who have so
resigned,  shall have power to fill such vacancy or vacancies,  the vote thereon
to take effect when such resignation or resignations shall become effective, and
each  director so chosen  shall hold office  until the next annual  election and
until his successor is elected and qualified,  or until his earlier  resignation
or removal.

                3.4 Place of Meetings. The board of directors of the corporation
may hold meetings,  both regular and special, either within or without the State
of Delaware.

                3.5 First Meeting of Each Board. The first meeting of each newly
elected  board of  directors  shall be held at such  time and  place as shall be
specified in a notice given as hereinafter  provided for special meetings of the
board of  directors,  or as shall be  specified  in a  written  waiver of notice
signed by all of the directors.

                3.6 Regular Meetings. Regular meetings of the board of directors
may be held without  notice at such time and at such place as shall from time to
time be  determined  by the board of directors.  

                3.7  Special  Meetings.  Special  meetings  of the  board may be
called by the president on one day's notice to each director,  either personally
or by telephone, by mail or by telegram; special meetings shall be called by the
president or secretary in like manner and on like notice on the written  request
of one-third of the total number of directors.

                                      -#-
<PAGE>



                3.8 Quorum and Vote at  Meetings.  At all meetings of the board,
one director if a board of one director is authorized, or such greater number of
directors as is not less than a majority of the total number of directors, shall
constitute a quorum for the  transaction of business.  The vote of a majority of
the directors present at any meeting at which there is a quorum shall be the act
of the board of directors,  except as may be otherwise  specifically provided by
statute or by the certificate of incorporation. If a quorum shall not be present
at any meeting of the board of  directors,  the  directors  present  thereat may
adjourn  the  meeting  to  another  time and place,  without  notice  other than
announcement at the meeting of such other time and place.

                3.9 Telephone Meetings. Members of the board of directors or any
committee  designated by the board may participate in a meeting of such board or
committee by means of conference telephone or similar  communications  equipment
by means of which all persons  participating in the meeting can hear each other,
and  participation  in a  meeting  pursuant  to this  section  shall  constitute
presence in person at such meeting.

                3.10 Action Without Meeting.  Unless otherwise restricted by the
certificate of incorporation or these by-laws,  any action required or permitted
to be taken at any meeting of the board of directors or of any committee thereof
may be taken without a meeting, if all members of the board or committee, as

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<PAGE>



the case may be,  consent  thereto in writing,  and the writing or writings  are
filed with the minutes of proceedings of the board of directors or committee.

                3.11  Committees  of  Directors.  The board of directors  may by
resolution  passed by a  majority  of the  whole  board,  designate  one or more
committees,  each  committee  to consist of one or more of the  directors of the
corporation.  The board may designate one or more directors as alternate members
of any  committee,  who may  replace  any absent or  disqualified  member at any
meeting of the  committee.  If a member of a committee  shall be absent from any
meeting,  or disqualified  from voting thereat,  the remaining member or members
present and not disqualified from voting,  whether or not such member or members
constitute a quorum, may, by unanimous vote, appoint another member of the board
of directors  to act at the meeting in the place of such absent or  disqualified
member.  Any such  committee,  to the extent  provided in the  resolution of the
board of directors,  shall have and may exercise all the powers and authority of
the board of  directors  in the  management  of the  business and affairs of the
corporation,  and may authorize the seal of the corporation to be affixed to all
papers  which may  require  it;  but no such  committee  shall have the power or
authority in reference to amending the certificate of incorporation (except that
a committee  may, to the extent  authorized  in the  resolution  or  resolutions
providing for the issuance of shares of stock adopted by the board of directors

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<PAGE>



pursuant  to  Section  151(a)  of the  General  Corporation  Law of the State of
Delaware  [hereinafter the "GCL"],  fix any of the preferences or rights of such
shares  relating to dividends,  redemption,  dissolution,  any  distribution  of
assets of the corporation or the conversion into, or the exchange of such shares
for, shares of any other class or classes or any other series of the same or any
other class or classes of stock of the  corporation),  adopting an  agreement of
merger or consolidation pursuant to Sections 251 or 252 of the GCL, recommending
to the stockholders  the sale, lease or exchange of all or substantially  all of
the  corporation's  property  and assets,  recommending  to the  stockholders  a
dissolution of the corporation or a revocation of a dissolution, or amending the
by-laws of the  corporation;  and, unless  otherwise  expressly  provided in the
resolution,  no such  committee  shall have the power or  authority to declare a
dividend,  to authorize  the  issuance of stock,  or to adopt a  certificate  of
ownership  and merger  pursuant to Section  253 of the GCL.  Such  committee  or
committees  shall have such name or names as may be determined from time to time
by resolution adopted by the board of directors.  Unless otherwise  specified in
the  resolution  of the board of directors  designating  the  committee,  at all
meetings of each such committee of directors,  a majority of the total number of
members  of the  committee  shall  constitute  a quorum for the  transaction  of
business,  and the vote of a majority of the members of the committee present at
any

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<PAGE>



meeting  at  which  there is a quorum  shall be the act of the  committee.  Each
committee  shall keep regular minutes of its meetings and report the same to the
board of directors, when required.

                3.12 Compensation of Directors.  Unless otherwise  restricted by
the  certificate  of  incorporation,  the  board  of  directors  shall  have the
authority to fix the compensation of directors.  The directors may be paid their
expenses,  if any, of  attendance  at each meeting of the board of directors and
may be paid a fixed sum for attendance at each meeting of the board of directors
or a stated salary as director. No such payment shall preclude any director from
serving  the  corporation  in any  other  capacity  and  receiving  compensation
therefor.   Members  of  special  or  standing   committees  may  be  paid  like
compensation for attending committee meetings.

4.      Notices of Meetings.
        ------------------
                4.1 Notice Procedure.  Whenever, whether under the provisions of
any statute or of the certificate of incorporation  or of these by-laws,  notice
is required to be given to any director or stockholder,  such requirement  shall
not be  construed to require the giving of personal  notice.  Such notice may be
given in writing,  by mail,  addressed to such director or  stockholder,  at his
address as it appears on the records of the  corporation,  with postage  thereon
prepaid, and such notice shall

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<PAGE>



be  deemed  to be given at the time  when the same is  deposited  in the  United
States  mail.  Notice  to  directors  may also be given by  telex,  telegram  or
telephone.

                4.2  Waivers  of  Notice.  Whenever  the giving of any notice is
required by statute, the certificate of incorporation or these by-laws, a waiver
thereof,  in writing,  signed by the person or persons  entitled to said notice,
whether before or after the event as to which such notice is required,  shall be
deemed  equivalent  to  notice.  Attendance  of  a  person  at a  meeting  shall
constitute a waiver of notice of such meeting,  except when the person attends a
meeting for the express  purpose of objecting,  at the beginning of the meeting,
to the transaction of any business because the meeting is not lawfully called or
convened.  Neither  the  business to be  transacted  at, nor the purpose of, any
regular  or  special  meeting  of the  stockholders,  directors  or members of a
committee of directors need be specified in any written waiver of notice, unless
so required by the certificate of incorporation, by statute or by these by-laws.

5.      Officers.
        --------
                5.1  Positions.  The  officers  of the  corporation  shall  be a
chairman and a secretary,  and such other officers as the board of directors may
appoint,  including a president,  vice chairman, one or more vice presidents,  a
treasurer,  assistant secretaries and assistant  treasurers,  who shall exercise
such

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<PAGE>



powers and perform such duties as shall be  determined  from time to time by the
board.  Any  number  of  offices  may be held by the  same  person,  unless  the
certificate  of  incorporation  or these by-laws  otherwise  provide;  provided,
however,  that in no event  shall the  chairman  and the  secretary  be the same
person.

                5.2 Appointment. The officers of the corporation shall be chosen
by the board of  directors  at its first  meeting  after each annual  meeting of
stockholders.

                5.3  Compensation.  The  compensation  of  all  officers  of the
corporation shall be fixed by the board of directors.

                5.4 Term of Office.  The officers of the corporation  shall hold
office  until their  successors  are chosen and  qualify or until their  earlier
resignation  or removal.  Any officer may resign at any time upon written notice
to the  corporation.  Any officer elected or appointed by the board of directors
may be removed at any time, with or without cause, by the affirmative  vote of a
majority of the board of directors.  Any vacancy  occurring in any office of the
corporation shall be filled by the board of directors.

                5.5 Fidelity  Bonds.  The corporation may secure the fidelity of
any or all of its officers or agents by bond or otherwise.

                5.6 Chairman.  The chairman shall be the chief executive officer
of the  corporation,  shall be ex officio a member of all  standing  committees,
shall have general and active

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<PAGE>



management of the business of the corporation,  shall ensure that all orders and
resolutions  of the board of  directors  are carried into  effect,  and,  unless
otherwise  provided by the board of directors,  shall preside at all meetings of
the  stockholders  and the  board of  directors.  The  chairman  shall  have the
authority to execute  bonds,  mortgages  and other  contracts  requiring a seal,
under the seal of the corporation,  except where required or permitted by law to
be otherwise  signed and  executed  and except  where the signing and  execution
thereof  shall be  expressly  delegated  by the board of directors to some other
officer or agent of the corporation.

                5.7  President.  The  president  shall  be the  chief  operating
officer of the  corporation,  shall have general  management  of the  day-to-day
operations of the business of the  corporation,  subject to the authority of the
chairman.  In the  absence  of the  chairman  or in the event of the  chairman's
inability  or refusal to act,  the  president  shall  perform  the duties of the
chairman  (except to the extent that the vice  chairman is authorized to perform
such duties), and when so acting shall have all the powers of, and be subject to
all the restrictions upon, the chairman.  The president shall have the authority
to execute bonds, mortgages and other contracts requiring a seal, under the seal
of the  corporation,  except where  required or permitted by law to be otherwise
signed and executed and except where the signing and execution thereof shall be

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<PAGE>



expressly  delegated by the board of directors to some other officer or agent of
the corporation.

                5.8 Vice Chairman or Vice  Presidents.  If the  directors  shall
appoint a vice  chairman or one or more vice  presidents,  such vice chairman or
vice presidents  shall perform such duties and have such powers as may be vested
in such vice  chairman or vice  presidents  by the board of  directors or by the
chairman. In the absence of the chairman, the vice chairman shall preside at all
meetings of stockholders and the board of directors, and the vice chairman shall
report to the chairman and be subject to his authority and direction.

                5.9  Secretary.  The secretary  shall attend all meetings of the
board of directors  and all meetings of the  stockholders,  and shall record all
the  proceedings  of the  meetings  of the  stockholders  and  of the  board  of
directors in a book to be kept for that  purpose,  and shall perform like duties
for the standing committees,  when required.  The secretary shall give, or cause
to be given,  notice of all meetings of the stockholders and special meetings of
the board of directors, and shall perform such other duties as may be prescribed
by the board of  directors  or by the  president,  under whose  supervision  the
secretary  shall be. The secretary  shall have custody of the corporate  seal of
the  corporation,  and the  secretary,  or an  assistant  secretary,  shall have
authority to affix the same to any instrument  requiring it, and when so affixed
it may be attested by the signature of the

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<PAGE>



secretary  or by the  signature  of  such  assistant  secretary.  The  board  of
directors  may give general  authority to any other officer to affix the seal of
the  corporation  and to attest the affixing by such  officer's  signature.  The
secretary or an assistant  secretary may also attest all  instruments  signed by
the chairman, the president or any vice president.

                5.10 Assistant Secretary.  The assistant secretary,  or if there
be more than one, the assistant secretaries in the order determined by the board
of  directors  (or if there shall have been no such  determination,  then in the
order of their election), shall, in the absence of the secretary or in the event
of the secretary's  inability or refusal to act, perform the duties and exercise
the powers of the  secretary,  and shall perform such other duties and have such
other powers as the board of directors may from time to time prescribe.

                5.11       Treasurer.
                           ----------

                   5.11.1  Duties.  The treasurer  shall have the custody of the
corporate  funds and  securities  and shall keep full and  accurate  accounts of
receipts and  disbursements  in books  belonging to the  corporation,  and shall
deposit all moneys and other  valuable  effects in the name and to the credit of
the  corporation  in such  depositories  as may be  designated  by the  board of
directors.  The treasurer shall disburse the funds of the corporation as ordered
by the board of directors, taking

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<PAGE>



proper vouchers for such disbursements,  and shall render to the president,  and
to the  board  of  directors  at its  regular  meetings,  or when  the  board of
directors so requires,  an account of all  transactions  as treasurer and of the
financial condition of the corporation.

                   5.11.2  Bond.  If  required  by the board of  directors,  the
treasurer  shall give the corporation a bond in such sum and with such surety or
sureties as shall be  satisfactory  to the board of  directors  for the faithful
performance of the duties of the  treasurer's  office and for the restoration to
the corporation,  in case of the treasurer's death,  resignation,  retirement or
removal from office, of all books, papers, vouchers, money and other property of
whatever kind, in the treasurer's  possession or under the  treasurer's  control
and belonging to the corporation.

                   5.12  Assistant  Treasurer.  The assistant  treasurer,  or if
there shall be more than one, the assistant  treasurers in the order  determined
by the board of  directors  (or if there shall have been no such  determination,
then in the order of their election),  shall, in the absence of the treasurer or
in the event of the treasurer's  inability or refusal to act, perform the duties
and exercise the powers of the  treasurer,  and shall  perform such other duties
and have  such  other  powers as the  board of  directors  may from time to time
prescribe.

                                      -#-

<PAGE>




6.      Capital Stock.
        -------------

                6.1 Certificates of Stock;  Uncertificated Shares. The shares of
the corporation shall be represented by certificates, provided that the board of
directors may provide by resolution  or  resolutions  that some or all of any or
all classes or series of the corporation's stock shall be uncertificated shares.
Any such resolution shall not apply to shares represented by a certificate until
such certificate is surrendered to the corporation. Notwithstanding the adoption
of  such a  resolution  by  the  board  of  directors,  every  holder  of  stock
represented  by  certificates  and upon request  every holder of  uncertificated
shares shall be entitled to have a certificate  signed by, or in the name of the
corporation  by the chairman or vice chairman of the board of directors,  or the
president or vice president, and by the treasurer and/or assistant treasurer, or
the secretary or an assistant  secretary of such  corporation  representing  the
number of shares  registered in  certificate  form. Any or all the signatures on
the  certificate  may be  facsimile.  In case  any  officer,  transfer  agent or
registrar whose signature or facsimile  signature appears on a certificate shall
have  ceased  to be such  officer,  transfer  agent  or  registrar  before  such
certificate is issued,  it may be issued by the corporation with the same effect
as if such person were such officer,  transfer agent or registrar at the date of
issue.

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<PAGE>



                6.2 Lost  Certificates.  The board of directors may direct a new
certificate or  certificates of stock or  uncertificated  shares to be issued in
place of any certificate or certificates  theretofore  issued by the corporation
and  alleged  to have been  lost,  stolen or  destroyed,  upon the  making of an
affidavit of that fact by the person  claiming that the certificate of stock has
been  lost,  stolen  or  destroyed.  When  authorizing  such  issuance  of a new
certificate or  certificates,  the board of directors may, in its discretion and
as a condition  precedent  to the  issuance  thereof,  require the owner of such
lost,  stolen or destroyed  certificate or  certificates,  or such owner's legal
representative,  to advertise the same in such manner as the board shall require
and/or to give the  corporation a bond, in such sum as the board may direct,  as
indemnity  against any claim that may be made against the corporation on account
of the certificate  alleged to have been lost, stolen or destroyed or on account
of the issuance of such new certificate or uncertificated shares.

                6.3  Transfers.  The  transfer  of stock and  certificates  that
represent the stock and the transfer of uncertificated  shares shall be effected
in accordance  with the laws of the State of Delaware.  Any  restriction  on the
transfer of a security imposed by the corporation  shall be noted  conspicuously
on the security.

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<PAGE>



                6.4  Fixing  Record  Date.  In order  that the  corporation  may
determine the stockholders  entitled to notice of, or to vote at, any meeting of
stockholders  or any  adjournment  thereof,  or to express  consent to corporate
action in  writing  without a meeting,  or  entitled  to receive  payment of any
dividend  or other  distribution  or  allotment  of any  rights,  or entitled to
exercise any rights in respect of any change, conversion or exchange of stock or
for the purpose of any other lawful  action,  the board of directors may fix, in
advance,  a record  date,  which  shall not be more than sixty nor less than ten
days  before  the date of such  meeting,  nor more than  sixty days prior to any
other action.  A determination  of stockholders of record entitled to notice of,
or to vote at, a meeting of  stockholders  shall apply to any adjournment of the
meeting;  provided,  however,  that the board of directors  may fix a new record
date for the adjourned meeting.

                6.5 Registered  Stockholders.  The corporation shall be entitled
to recognize  the  exclusive  right of a person  registered  on its books as the
owner of shares to receive dividends, to receive notifications,  to vote as such
owner,  and to  exercise  all  the  rights  and  powers  of an  owner;  and  the
corporation  shall not be bound to recognize  any equitable or other claim to or
interest in such share or shares on the part of any other person, whether or not
it shall have express or other notice thereof,  except as otherwise  provided by
the laws of the State of Delaware.

                                      -#-

<PAGE>



7.      Indemnification.
        ---------------

                Unless expressly  prohibited by law, the corporation shall fully
indemnify any person made, or threatened to be made, a party to an action,  suit
or proceeding  (whether civil,  criminal,  administrative  or  investigative) by
reason of the fact that such person, or such person's testator or intestate,  is
or was a director or officer,  employee or agent of the corporation or serves or
served any other  enterprise  at the  request of the  corporation,  against  all
expenses (including attorneys' fees), judgments, fines and amounts paid or to be
paid in settlement incurred in connection with such action, suit or proceeding.

8.      General Provisions.
        ------------------

                8.1   Dividends.   Dividends  upon  the  capital  stock  of  the
corporation,  subject to the provisions of the certificate of incorporation  and
the laws of the State of Delaware,  may be declared by the board of directors at
any  regular  or  special  meeting.  Subject to the  provisions  of the  General
Corporation Law of the State of Delaware,  such dividends may be paid either out
of surplus,  as defined in the General Corporation Law of the State of Delaware,
or in the event that there shall be no such surplus,  out of the net profits for
the fiscal year in which the dividend is declared  and/or the  preceding  fiscal
year.  Dividends  may  be  paid  in  cash,  in  property,  or in  shares  of the
corporation's  capital  stock,  subject  to  the  provisions,  if  any,  of  the
certificate of incorporation.

                                      -#-
<PAGE>



                8.2 Reserves.  The directors of the  corporation  may set apart,
out of the funds of the  corporation  available  for  dividends,  a  reserve  or
reserves for any proper purpose and may abolish any such reserve.

                8.3  Execution of  Instruments.  All checks or demands for money
and notes of the corporation shall be signed by such officer or officers or such
other  person  or  persons  as the  board of  directors  may  from  time to time
designate.

                   8.4 Fiscal Year. The fiscal year of the corporation  shall be
fixed by resolution of the board of directors.

                8.5 Seal. The corporate  seal shall have  inscribed  thereon the
name of the  corporation,  the year of its organization and the words "Corporate
Seal, Delaware". The seal may be used by causing it or a facsimile thereof to be
impressed or affixed or otherwise reproduced.

9.      Amendments.
        ----------

                These  by-laws  may be  altered,  amended  or  repealed  and new
by-laws may be adopted by the board of directors.


                              *     *     *     *


                                      -#-

<PAGE>



                The foregoing  by-laws were adopted by the board of directors on
April   , 1992.
     ---







                                      -#-





                          CERTIFICATE OF INCORPORATION
                                       OF
                          ORIONNET FINANCE CORPORATION

                  FIRST:  The  name  of  the  Corporation  is  OrionNet  Finance
Corporation (hereinafter called the "Corporation").

                  SECOND:  The registered office of the Corporation in the State
of Delaware is 1013  Centre  Road,  Wilmington,  Delaware  19805,  County of New
Castle.  The name of the Corporation's  registered agent in Corporation  Service
Company.

                  THIRD:  The  purpose  of the  Corporation  is to engage in any
lawful acts or  activities  for which  corporations  may be organized  under the
General Corporation Law of Delaware.

                  FOURTH:  The  total  number  of  shares  of  stock  which  the
Corporation  shall have the authority to issue is One Thousand (1,000) shares of
Common Stock, all of one class, have a par value of $.01 per share.

                  FIFTH:  The name and mailing  address of the  incorporator  is
Richard  H.  Shay,  2440  Research  Boulevard,  Rockville,  Marlyand  20850 (the
"Incorporator").

                  SIXTH: The powers of the Incorporator shall terminate upon the
filing of this Certificate of Incorporation,  and the following persons,  having
the indicated mailing addresses, shall serve as the directors of the Corporation
until the first

<PAGE>



annual meeting of the  stockholders  of the  Corporation  or until  successor or
successors are elected and qualify:

                Name                                     Mailing Address
                -------------------------------------------------------------
John G. Puente                                    2440 Research Boulevard
                                                  Rockville, Maryland  20850

W. Neil Bauer                                     2440 Research Boulevard
                                                  Rockville, Maryland  20850

John Mattingly                                    2440 Research Boulevard
                                                  Rockville, Maryland  20850

                  SEVENTH:  The number of directors of the Corporation  shall be
such  number as from time to time shall be fixed by, or in the  manner  provided
in, the  by-laws of the  Corporation.  Unless and except to the extent  that the
by-laws of the Corporation shall otherwise require, the election of directors of
the Corporation need not be by written ballot.

                  EIGHTH:  In  furtherance  and not in  limitation of the powers
conferred  by the laws of the State of  Delaware,  the Board of Directors of the
Corporation  is expressly  authorized  and empowered to adopt,  amend and repeal
by-laws of the Corporation.

                  NINTH: No director of the  Corporation  shall be liable to the
Corporation  or its  stockholders  for monetary  damages for breach of fiduciary
duty as a director,  provided that nothing  contained in the Article Ninth shall
eliminate  or limit  the  liability  of a  director  (i) for any  breach  of the
director's duty of loyalty to the Corporation or its stockholders, (ii)

<PAGE>



for acts or omissions not if good faith or which involve intentional  misconduct
or a knowing  violation of law, (iii) under Section 174 of the Delaware  General
Corporation  Law, or (iv) for any transaction from which the director derived an
improper personal benefit.

                  TENTH:  The  Corporation  reserves the right at any time,  and
from time to time, to amend,  alter, change or repeal any provision contained in
this Certificate of Incorporation,  and other provisions  authorized by the laws
of the State of Delaware at the time in force may be added or  inserted,  in the
manner now or  hereafter  prescribed  by law;  and all rights,  preferences  and
privileges of whatsoever  nature conferred upon  stockholders,  directors or any
other persons whomsoever by and pursuant to this Certificate of Incorporation in
its present  form or as  hereafter  amended  are  granted  subject to the rights
reserved in this Article Tenth.

                  IN WITNESS WHEREOF,  the  undersigned,  being the Incorporator
hereinabove  named,  for the  purpose of forming a  corporation  pursuant to the
General  Corporation  Law of the State of Delaware,  hereby  certifies  that the
facts  hereinabove  stated are truly set forth,  and accordingly I have hereunto
set my hand this       day of      , 1993.
                ------        -----


                                              --------------------------
                                              Richard H. Shay




                                     BY-LAWS
                                       OF
                          ORIONNET FINANCE CORPORATION


1.       Offices.

                  1.1  Registered   Office.   The   registered   office  of  the
corporation shall be in the City of Wilmington,  County of New Castle,  State of
Delaware,  and the  registered  agent in  charge  thereof  shall be  Corporation
Service Company, 1013 Centre Road, Wilmington, Delaware 19805.

                  1.2 Other Offices.  The  corporation  may also have offices at
such other places,  both within and without the State of Delaware,  as the board
of directors may from time to time determine or the business of the  corporation
may require.

2.       Meetings of Stockholders.

                  2.1 Place of Meetings.  All meetings of the  stockholders  for
the election of directors shall be held in Washington, D.C. at such place as may
be fixed from time to time by the board of  directors,  or at such other  place,
within or without the State of  Delaware,  as shall be  designated  from time to
time by the board of directors and stated in the notice of the meeting

<PAGE>



or in a duly executed waiver of notice thereof. Meetings of stockholders for any
other purpose may be held at such time and place, within or without the State of
Delaware,  as shall be stated in the notice of the meeting or in a duly executed
waiver of notice thereof.

                  2.2  Annual   Meetings.   Annual  meetings  of   stockholders,
commencing  with the year 1993,  shall be held on the first  Thursday of May, if
not a legal  holiday,  and if a legal  holiday,  then on the  next  secular  day
following,  at 10:00 a.m., or at such other date and time as shall be designated
from  time to time by the board of  directors  and  stated in the  notice of the
meeting or in a duly executed  waiver of notice thereof,  at which  stockholders
shall  elect a board of  directors  and  transact  such  other  business  as may
properly be brought before the meeting.

                  2.3 Special  Meetings.  Special meetings of the  stockholders,
for any purpose or purposes,  unless  otherwise  prescribed by statute or by the
certificate of incorporation,  may be called by the board of directors or by the
president,  and shall be called by the  president or secretary at the request in
writing of stockholders  owning a majority in amount of the entire capital stock
of the  corporation  issued and  outstanding  and entitled to vote. Such request
shall include a statement of the purpose or purposes of the proposed meeting.

                  2.4 Notice of Meetings.  Written notice of the annual meeting,
stating the place, date and hour of the meeting, shall be given to each

<PAGE>



stockholder  entitled  to vote at such  meeting  not less than ten nor more than
sixty days before the date of the meeting.  Written notice of a special  meeting
of stockholders, stating the place, date and hour of the meeting and the purpose
or purposes for which the meeting is called,  shall be given to each stockholder
entitled  to vote at such  meeting  not less than ten nor more than  sixty  days
before the date of the meeting.

                  2.5 Business at Special Meetings.  Business  transacted at any
special meeting of  stockholders  shall be limited to the purposes stated in the
notice.

                  2.6 List of  Stockholders.  The  officer who has charge of the
stock ledger of the corporation shall prepare and make, at least ten days before
every meeting of stockholders,  a complete list of the stockholders  entitled to
vote at the meeting,  arranged in alphabetical  order and showing the address of
each  stockholder  and the  number  of  shares  registered  in the  name of each
stockholder.  Such list shall be open to the examination of any stockholder, for
any purpose germane to the meeting, during ordinary business hours, for a period
of at least ten days  prior to the  meeting,  either at a place  within the city
where the meeting is to be held, which place shall be specified in the notice of
the meeting,  or, if not so  specified,  at the place where the meeting is to be
held.  The list  shall  also be  produced  and kept at the time and place of the
meeting during the whole time thereof,  and may be inspected by any  stockholder
who is present. The stock ledger shall be the

<PAGE>



only  evidence  as to who are the  stockholders  entitled  to examine  the stock
ledger, the list required by this section or the books of the corporation, or to
vote in person or by proxy at any meeting of stockholders.

                  2.7  Quorum at  Meetings.  Except  as  otherwise  provided  by
statute or by the certificate of incorporation, the holders of a majority of the
stock issued and outstanding and entitled to vote thereat,  present in person or
represented  by  proxy,  shall  constitute  a  quorum  at  all  meetings  of the
stockholders for the transaction of business. If, however, such quorum shall not
be  present  or  represented  at  any  such  meeting  of the  stockholders,  the
stockholders  entitled  to vote  thereat,  present in person or  represented  by
proxy, shall have power to adjourn the meeting from time to time to another time
and place,  without notice other than  announcement at the meeting of such other
time and place.  At the adjourned  meeting at which a quorum shall be present or
represented,  any business may be transacted which might have been transacted at
the original  meeting.  If the  adjournment  is for more than thirty days, or if
after the  adjournment a new record date is fixed for the adjourned  meeting,  a
notice of the  adjourned  meeting shall be given to each  stockholder  of record
entitled to vote at the meeting.

                  2.8 Voting  and  Proxies.  Unless  otherwise  provided  in the
certificate  of  incorporation,  and subject to the provisions of Section 6.4 of
these by-laws, each stockholder shall be entitled to one vote on each matter, in
person or by proxy, for each share of the corporation's capital stock having

<PAGE>



                  voting power which is held by such stockholder. No proxy shall
be voted or acted  upon  after  three  years  from its  date,  unless  the proxy
provides for a longer  period.  A duly executed proxy shall be irrevocable if it
states that it is irrevocable and if, and only as long as, it is coupled with an
interest  sufficient in law to support an irrevocable power. A proxy may be made
irrevocable  regardless  of whether the interest  with which it is coupled is an
interest in the stock itself or an interest in the corporation generally.

                  2.9 Required Vote.  When a quorum is present at any meeting of
stockholders,  all matters shall be determined, adopted and approved by the vote
(which  need not be by ballot) of a majority  of the votes cast with  respect to
the matter,  unless the proposed action is one upon which, by express  provision
of  statutes  or of the  certificate  of  incorporation,  a  different  vote  is
specified and required,  in which case such express  provision  shall govern and
control the decision of such question. Notwithstanding the foregoing, candidates
for election as members of the board of directors who receive the highest number
of votes, up to the number of directors to be chosen,  shall stand elected,  and
an  absolute  majority  of the votes  cast  shall not be a  prerequisite  to the
election of any candidate to the board of directors.

                  2.10 Action Without a Meeting.  Unless  otherwise  provided in
the certificate of incorporation,  any action required to be taken at any annual
or special meeting of stockholders of the  corporation,  or any action which may
be taken at any annual or special  meeting  of such  stockholders,  may be taken
without a meeting, without prior notice and without a vote, if a consent in

<PAGE>



writing,  setting  forth  the  action so taken,  is  signed  by the  holders  of
outstanding stock having not less than the minimum number of votes that would be
necessary  to  authorize  or take such  action at a meeting  at which all shares
entitled to vote thereon were present and voted.  Prompt notice of the taking of
the corporate  action without a meeting by less than unanimous  written  consent
shall be given to those stockholders who shall not have consented in writing.

3.       Directors.

                  3.1 Powers.  The business and affairs of the corporation shall
be  managed  by or under  the  direction  of the board of  directors,  which may
exercise  all such  powers of the  corporation  and do all such  lawful acts and
things as are not by statute or by the certificate of  incorporation or by these
by-laws directed or required to be exercised or done by the stockholders.

                  3.2 Number and Election.  The number of directors  which shall
constitute  the whole  board  shall not be less than one nor more than ten.  The
first  board shall  consist of three  directors.  Thereafter,  within the limits
above  specified,  the number of directors  shall be determined by resolution of
the board of directors.  The directors shall be elected at the annual meeting of
the  stockholders,  except as provided in Section 3.3 hereof,  and each director
elected  shall hold office until his successor is elected and qualified or until
his earlier resignation or removal. Directors need not be stockholders.

<PAGE>



                  3.3  Vacancies.  Vacancies  and  newly  created  directorships
resulting from any increase in the authorized  number of directors may be filled
by a majority of the directors then in office,  although less than a quorum,  or
by a sole  remaining  director,  and each  director so chosen  shall hold office
until the next annual election and until his successor is elected and qualified,
or until his  earlier  resignation  or  removal.  If there are no  directors  in
office,  then an election  of  directors  may be held in the manner  provided by
statute.  If,  at  the  time  of  filling  any  vacancy  or  any  newly  created
directorship,  the directors then in office  constitute  less than a majority of
the whole board (as constituted  immediately  prior to any such  increase),  the
Court of  Chancery  of the  State  of  Delaware  may,  upon  application  of any
stockholder or stockholders  holding at least ten percent of the total number of
the then  outstanding  shares  having  the  right  to vote  for such  directors,
summarily  order an  election  to be held to fill any  such  vacancies  or newly
created directorships,  or to replace the directors chosen by the directors then
in  office,  in  accordance  with the  General  Corporation  Law of the State of
Delaware.  In the  event  that one or more  directors  resigns  from the  board,
effective  at a  future  date,  a  majority  of the  directors  then in  office,
including  those who have so resigned,  shall have power to fill such vacancy or
vacancies, the vote thereon to take effect when such resignation or resignations
shall become effective, and each director so chosen shall hold

<PAGE>



office  until the next annual  election  and until his  successor is elected and
qualified, or until his earlier resignation or removal.

                  3.4  Place  of  Meetings.   The  board  of  directors  of  the
corporation  may hold  meetings,  both  regular and  special,  either  within or
without the State of Delaware.

                  3.5 First  Meeting of Each  Board.  The first  meeting of each
newly elected  board of directors  shall be held at such time and place as shall
be specified in a notice given as hereinafter  provided for special  meetings of
the board of directors,  or as shall be specified in a written  waiver of notice
signed by all of the directors.

                  3.6  Regular  Meetings.  Regular  meetings  of  the  board  of
directors  may be held  without  notice at such time and at such  place as shall
from time to time be determined by the board of directors.

                  3.7  Special  Meetings.  Special  meetings of the board may be
called by the president on one day's notice to each director,  either personally
or by telephone, by mail or by telegram; special meetings shall be called by the
president or secretary in like manner and on like notice on the written  request
of one-third of the total number of directors.

                  3.8 Quorum and Vote at Meetings. At all meetings of the board,
one director if a board of one director is authorized, or such greater number of
directors as is not less than a majority of the total number of directors, shall
constitute a quorum for the transaction of business. The vote

<PAGE>



of a majority of the directors present at any meeting at which there is a quorum
shall  be  the  act  of the  board  of  directors,  except  as may be  otherwise
specifically  provided by statute or by the certificate of  incorporation.  If a
quorum  shall not be  present  at any  meeting  of the board of  directors,  the
directors  present  thereat may  adjourn the meeting to another  time and place,
without  notice  other than  announcement  at the meeting of such other time and
place.

                  3.9 Telephone  Meetings.  Members of the board of directors or
any committee designated by the board may participate in a meeting of such board
or  committee  by  means  of  conference  telephone  or  similar  communications
equipment  by means of which all persons  participating  in the meeting can hear
each  other,  and  participation  in a meeting  pursuant to this  section  shall
constitute presence in person at such meeting.

                  3.10 Action Without Meeting.  Unless  otherwise  restricted by
the  certificate  of  incorporation  or these  by-laws,  any action  required or
permitted  to be taken  at any  meeting  of the  board  of  directors  or of any
committee thereof may be taken without a meeting, if all members of the board or
committee,  as the case may be, consent  thereto in writing,  and the writing or
writings are filed with the minutes of  proceedings of the board of directors or
committee.

                  3.11  Committees of  Directors.  The board of directors may by
resolution passed by a majority of the whole board, designate one or more

<PAGE>



committees,  each  committee  to consist of one or more of the  directors of the
corporation.  The board may designate one or more directors as alternate members
of any  committee,  who may  replace  any absent or  disqualified  member at any
meeting of the  committee.  If a member of a committee  shall be absent from any
meeting,  or disqualified  from voting thereat,  the remaining member or members
present and not disqualified from voting,  whether or not such member or members
constitute a quorum, may, by unanimous vote, appoint another member of the board
of directors  to act at the meeting in the place of such absent or  disqualified
member.  Any such  committee,  to the extent  provided in the  resolution of the
board of directors,  shall have and may exercise all the powers and authority of
the board of  directors  in the  management  of the  business and affairs of the
corporation,  and may authorize the seal of the corporation to be affixed to all
papers  which may  require  it;  but no such  committee  shall have the power or
authority in reference to amending the certificate of incorporation (except that
a committee  may, to the extent  authorized  in the  resolution  or  resolutions
providing  for the issuance of shares of stock adopted by the board of directors
pursuant  to  Section  151(a)  of the  General  Corporation  Law of the State of
Delaware  [hereinafter the "GCL"],  fix any of the preferences or rights of such
shares  relating to dividends,  redemption,  dissolution,  any  distribution  of
assets of the corporation or the conversion into, or the exchange of such shares
for, shares of any other class or classes or any other

<PAGE>



series of' the same or any other class or classes of stock of the  corporation),
adopting an agreement of merger or consolidation pursuant to Sections 251 or 252
of the GCL,  recommending to the stockholders the sale, lease or exchange of all
or substantially all of the corporation's  property and assets,  recommending to
the  stockholders  a  dissolution  of  the  corporation  or  a  revocation  of a
dissolution,  or amending the by-laws of the corporation;  and, unless otherwise
expressly provided in the resolution,  no such committee shall have the power or
authority to declare a dividend, to authorize the issuance of stock, or to adopt
a certificate  of ownership and merger  pursuant to Section 253 of the GCL. Such
committee or committees  shall have such name or names as may be determined from
time to time by resolution  adopted by the board of directors.  Unless otherwise
specified in the resolution of the board of directors designating the committee,
at all  meetings of each such  committee of  directors,  a majority of the total
number of members of the committee shall constitute a quorum for the transaction
of business,  and the vote of a majority of the members of the committee present
at any  meeting at which  there is a quorum  shall be the act of the  committee.
Each committee shall keep regular minutes of its meetings and report the same to
the board of directors, when required.

                  3.12 Compensation of Directors. Unless otherwise restricted by
the  certificate  of  incorporation,  the  board  of  directors  shall  have the
authority to fix the compensation of directors.  The directors may be paid their
expenses, if any, of attendance at each meeting of the board of directors

<PAGE>



and may be paid a fixed  sum for  attendance  at each  meeting  of the  board of
directors or a stated  salary as director.  No such payment  shall  preclude any
director  from  serving the  corporation  in any other  capacity  and  receiving
compensation  therefor.  Members of special or standing  committees  may be paid
like compensation for attending committee meetings.

4.       Notices of Meetings.

                  4.1 Notice Procedure.  Whenever,  whether under the provisions
of any  statute or of the  certificate  of  incorporation  or of these  by-laws,
notice is required to be given to any director or stockholder,  such requirement
shall not be construed to require the giving of personal notice. Such notice may
be given in writing, by mail, addressed to such director or stockholder,  at his
address as it appears on the records of the  corporation,  with postage  thereon
prepaid,  and such notice  shall be deemed to be given at the time when the same
is deposited in the United States mail. Notice to directors may also be given by
telex, telegram or telephone.

                  4.2  Waivers of Notice.  Whenever  the giving of any notice is
required by statute, the certificate of incorporation or these by-laws, a waiver
thereof,  in writing,  signed by the person or persons  entitled to said notice,
whether before or after the event as to which such notice is required,  shall be
deemed  equivalent  to  notice.  Attendance  of  a  person  at a  meeting  shall
constitute a waiver of notice of such meeting,  except when the person attends a
meeting for the express purpose of objecting, at the beginning of the

<PAGE>



meeting,  to the transaction of any business because the meeting is not lawfully
called or convened.  Neither the business to be  transacted  at, nor the purpose
of, any regular or special meeting of the stockholders,  directors or members of
a committee  of directors  need be  specified  in any written  waiver of notice,
unless so required by the certificate of  incorporation,  by statute or by these
by-laws.

5.       Officers.

                  5.1  Positions.  The  officers of the  corporation  shall be a
president, a secretary and a treasurer,  and such other officers as the board of
directors may appoint,  including a chairman of the board,  and one or more vice
presidents,  assistant secretaries and assistant treasurers,  who shall exercise
such powers and perform such duties as shall be determined  from time to time by
the  board.  Any number of offices  may be held by the same  person,  unless the
certificate  of  incorporation  or these by-laws  otherwise  provide;  provided,
however,  that in no event shall the  president  and the  secretary  be the same
person.

                  5.2  Appointment.  The  officers of the  corporation  shall be
chosen by the board of directors at its first meeting after each annual  meeting
of stockholders.

                  5.3  Compensation.  The  compensation  of all  officers of the
corporation shall be fixed by the board of directors.

<PAGE>



                  5.4 Term of Office. The officers of the corporation shall hold
office  until their  successors  are chosen and  qualify or until their  earlier
resignation  or removal.  Any officer may resign at any time upon written notice
to the  corporation.  Any officer elected or appointed by the board of directors
may be removed at any time, with or without cause, by the affirmative  vote of a
majority of the board of directors.  Any vacancy  occurring in any office of the
corporation shall be filled by the board of directors.

                  5.5 Fidelity Bonds. The corporation may secure the fidelity of
any or all of its officers or agents by bond or otherwise.

                  5.6  President.  The  president  shall be the chief  executive
officer  of the  corporation,  shall  be ex  officio  a member  of all  standing
committees,  shall have  general and active  management  of the  business of the
corporation,  shall  ensure  that all  orders  and  resolutions  of the board of
directors are carried into effect,  and, unless otherwise  provided by the board
of directors, shall preside at all meetings of the stockholders and the board of
directors.  The president  shall execute  bonds,  mortgages and other  contracts
requiring a seal,  under the seal of the  corporation,  except where required or
permitted  by law to be  otherwise  signed and  executed  and  except  where the
signing and  execution  thereof  shall be  expressly  delegated  by the board of
directors to some other officer or agent of the corporation.

<PAGE>



                  5.7 Vice President.  In the absence of the president or in the
event of the president's  inability or refusal to act, the vice president (or in
the event  there be more than one vice  president,  the vice  presidents  in the
order  designated,  or in the absence of any  designation,  then in the order of
their  election)  shall perform the duties of the president,  and when so acting
shall have all the powers of, and be subject to all the  restrictions  upon, the
president.  The vice  presidents  shall  perform such other duties and have such
other powers as the board of directors may from time to time prescribe.

                  5.8 Chairman of the Board.  If the  directors  shall appoint a
chairman of the board, the chairman shall, when present, preside at all meetings
of the board of  directors  and shall  perform  such other  duties and have such
other powers as may be vested in the chairman by the board of directors.

                  5.9 Secretary.  The secretary shall attend all meetings of the
board of directors  and all meetings of the  stockholders,  and shall record all
the  proceedings  of the  meetings  of the  stockholders  and  of the  board  of
directors in a book to be kept for that  purpose,  and shall perform like duties
for the standing committees,  when required.  The secretary shall give, or cause
to be given,  notice of all meetings of the stockholders and special meetings of
the board of directors, and shall perform such other duties as may be prescribed
by the board of  directors  or by the  president,  under whose  supervision  the
secretary shall be. The secretary shall have custody of the

<PAGE>



corporate seal of the corporation, and the secretary, or an assistant secretary,
shall have authority to affix the same to any instrument  requiring it, and when
so  affixed it may be  attested  by the  signature  of the  secretary  or by the
signature of such assistant  secretary.  The board of directors may give general
authority  to any  other  officer  to affix the seal of the  corporation  and to
attest the affixing by such officer's  signature.  The secretary or an assistant
secretary may also attest all  instruments  signed by the chairman of the board,
the president or any vice president.

                  5.10 Assistant Secretary. The assistant secretary, or if there
be more than one, the assistant secretaries in the order determined by the board
of  directors  (or if there shall have been no such  determination,  then in the
order of their election), shall, in the absence of the secretary or in the event
of the secretary's  inability or refusal to act, perform the duties and exercise
the powers of the  secretary,  and shall perform such other duties and have such
other powers as the board of directors may from time to time prescribe.

5.11     Treasurer.

                  5.11.1  Duties.  The  treasurer  shall have the custody of the
corporate  funds and  securities  and shall keep full and  accurate  accounts of
receipts and  disbursements  in books  belonging to the  corporation,  and shall
deposit all moneys and other  valuable  effects in the name and to the credit of
the  corporation  in such  depositories  as may be  designated  by the  board of
directors. The treasurer shall disburse the funds of the corporation

<PAGE>



as  ordered  by  the  board  of  directors,  taking  proper  vouchers  for  such
disbursements,  and shall render to the president, and to the board of directors
at its regular meetings,  or when the board of directors so requires, an account
of  all  transactions  as  treasurer  and  of  the  financial  condition  of the
corporation.

                  5.11.2  Bond.  If  required  by the  board of  directors,  the
treasurer  shall give the corporation a bond in such sum and with such surety or
sureties as shall be  satisfactory  to the board of  directors  for the faithful
performance of the duties of the  treasurer's  office and for the restoration to
the corporation,  in case of the treasurer's death,  resignation,  retirement or
removal from office, of all books, papers, vouchers, money and other property of
whatever kind, in the treasurer's  possession or under the  treasurer's  control
and belonging to the corporation.

                  5.12 Assistant Treasurer. The assistant treasurer, or if there
shall be more than one, the assistant  treasurers in the order determined by the
board of directors (or if there shall have been no such  determination,  then in
the order of their  election),  shall, in the absence of the treasurer or in the
event of the  treasurer's  inability  or refusal to act,  perform the duties and
exercise the powers of the  treasurer,  and shall  perform such other duties and
have  such  other  powers  as the  board  of  directors  may  from  time to time
prescribe.

<PAGE>



6.       Capital Stock.

                  6.1 Certificates of Stock;  Uncertificated  Shares. The shares
of the corporation shall be represented by certificates, provided that the board
of directors may provide by resolution or resolutions that some or all of any or
all classes or series of the corporation's stock shall be uncertificated shares.
Any such resolution shall not apply to shares represented by a certificate until
such certificate is surrendered to the corporation. Notwithstanding the adoption
of  such a  resolution  by  the  board  of  directors,  every  holder  of  stock
represented  by  certificates  and upon request  every holder of  uncertificated
shares shall be entitled to have a certificate  signed by, or in the name of the
corporation  by the chairman or vice chairman of the board of directors,  or the
president or vice president, and by the treasurer and/or assistant treasurer, or
the secretary or an assistant  secretary of such  corporation  representing  the
number of shares  registered in  certificate  form. Any or all the signatures on
the  certificate  may be  facsimile.  In case  any  officer,  transfer  agent or
registrar whose signature or facsimile  signature appears on a certificate shall
have  ceased  to be such  officer,  transfer  agent  or  registrar  before  such
certificate is issued,  it may be issued by the corporation with the same effect
as if such person were such officer,  transfer agent or registrar at the date of
issue.

                  6.2 Lost Certificates. The board of directors may direct a new
certificate or  certificates of stock or  uncertificated  shares to be issued in
place

<PAGE>



of any  certificate or  certificates  theretofore  issued by the corporation and
alleged to have been lost, stolen or destroyed,  upon the making of an affidavit
of that fact by the person claiming that the certificate of stock has been lost,
stolen or destroyed.  When  authorizing  such issuance of a new  certificate  or
certificates,  the board of directors  may, in its discretion and as a condition
precedent to the  issuance  thereof,  require the owner of such lost,  stolen or
destroyed certificate or certificates, or such owner's legal representative,  to
advertise the same in such manner as the board shall require  and/or to give the
corporation  a bond, in such sum as the board may direct,  as indemnity  against
any claim that may be made against the corporation on account of the certificate
alleged to have been lost,  stolen or destroyed or on account of the issuance of
such new certificate or uncertificated shares.

                  6.3  Transfers.  The transfer of stock and  certificates  that
represent the stock and the transfer of uncertificated  shares shall be effected
in accordance  with the laws of the State of Delaware.  Any  restriction  on the
transfer of a security imposed by the corporation  shall be noted  conspicuously
on the security.

                  6.4 Fixing  Record  Date.  In order that the  corporation  may
determine the stockholders  entitled to notice of, or to vote at, any meeting of
stockholders  or any  adjournment  thereof,  or to express  consent to corporate
action in  writing  without a meeting,  or  entitled  to receive  payment of any
dividend or other distribution or allotment of any rights, or entitled to

<PAGE>



exercise any rights in respect of any change, conversion or exchange of stock or
for the purpose of any other lawful  action,  the board of directors may fix, in
advance,  a record  date,  which  shall not be more than sixty nor less than ten
days  before  the date of such  meeting,  nor more than  sixty days prior to any
other action.  A determination  of stockholders of record entitled to notice of,
or to vote at, a meeting of  stockholders  shall apply to any adjournment of the
meeting;  provided,  however,  that the board of directors  may fix a new record
date for the adjourned meeting.

                  6.5 Registered Stockholders. The corporation shall be entitled
to recognize  the  exclusive  right of a person  registered  on its books as the
owner of shares to receive dividends, to receive notifications,  to vote as such
owner,  and to  exercise  all  the  rights  and  powers  of an  owner;  and  the
corporation  shall not be bound to recognize  any equitable or other claim to or
interest in such share or shares on the part of any other person, whether or not
it shall have express or other notice thereof,  except as otherwise  provided by
the laws of the State of Delaware.

7.       Indemnification.

                  Unless  expressly  prohibited  by law, the  corporation  shall
fully indemnify any person made, or threatened to be made, a party to an action,
suit or proceeding (whether civil, criminal, administrative or investigative) by
reason of the fact that such person,  or such persons testator or intestate,  is
or was a director or officer, employee or agent of the corporation or serves or

<PAGE>



served any other  enterprise  at the  request of the  corporation,  against  all
expenses (including attorneys' fees), judgments, fines and amounts paid or to be
paid in settlement incurred in connection with such action, suit or proceeding.

8.       General Provisions.

                  8.1  Dividends.  Dividends  upon  the  capital  stock  of  the
corporation,  subject to the provisions of the certificate of incorporation  and
the laws of the State of Delaware,  may be declared by the board of directors at
any  regular  or  special  meeting.  Subject to the  provisions  of the  General
Corporation Law of the State of Delaware,  such dividends may be paid either out
of surplus,  as defined in the General Corporation Law of the State of Delaware,
or in the event that there shall be no such surplus,  out of the net profits for
the fiscal year in which the dividend is declared  and/or the  preceding  fiscal
year.  Dividends  may  be  paid  in  cash,  in  property,  or in  shares  of the
corporation's  capital  stock,  subject  to  the  provisions,  if  any,  of  the
certificate of incorporation.

                  8.2 Reserves.  The directors of the corporation may set apart,
out of the funds of the  corporation  available  for  dividends,  a  reserve  or
reserves for any proper purpose and may abolish any such reserve.

                  8.3 Execution of Instruments.  All checks or demands for money
and notes of the corporation shall be signed by such officer or officers

<PAGE>



or such other person or persons as the board of directors  may from time to time
designate.

                  8.4 Fiscal Year. The fiscal year of the  corporation  shall be
fixed by resolution of the board of directors.

                  8.5 Seal. The corporate seal shall have inscribed  thereon the
name of the  corporation,  the year of its organization and the words "Corporate
Seal, Delaware". The seal may be used by causing it or a facsimile thereof to be
impressed or affixed or otherwise reproduced.

9.       Amendments.

                  These  by-laws  may be altered,  amended or  repealed  and new
by-laws may be adopted by the board of directors.

                                     * * * *


                  The  foregoing  by-laws were adopted by the board of directors
on ______________, 1993.


                                              ----------------------------------
                                                         Secretary


                          CERTIFICATE OF INCORPORATION

                                       OF

                   Asia Pacific Space And Communications, Ltd.




     The  undersigned,  a  natural  person,  for the  purpose  of  organizing  a
corporation  for conducting the business and promoting the purposes  hereinafter
stated,  under the provisions and subject to the requirements of the laws of the
State of Delaware  (particularly Chapter 1, Title 8 of the Delaware Code and the
acts amendatory  thereof and  supplemental  thereto,  and known,  identified and
referred to as the "General  Corporation Law of the State of Delaware"),  hereby
certifies that:

     FIRST: The name of the corporation  (hereinafter  called the "corporation")
is

     Asia Pacific Space And Communications, Ltd.

     SECOND:  The address,  including street,  number,  city, and county, of the
registered office of the corporation in the State of Delaware is 229 South State
Street,  City of Dover,  County of Kent; and the name of the registered agent of
the  corporation  in the  State of  Delaware  is The  Prentice-Hall  Corporation
System, Inc.

     THIRD:  The  purpose of the  corporation  is to engage in any lawful act or
activity for which  corporations may be organized under the General  Corporation
Law of the State of Delaware.

     FOURTH:  The total  number of shares of stock which the  corporation  shall
have  authority to issue is Ten Million  (10,000,000).  The par value of each of
such shares is One Cent ($.01).  All such shares are of one class and are shares
of Common Stock.

     FIFTH: The name and the mailing address of the incorporator are as follows:

         NAME                               MAILING ADDRESS

         T. M. Bonovich             229 South State Street, Dover, Delaware



<PAGE>



     SIXTH: The corporation is to have perpetual existence.

     SEVENTH:  Whenever a compromise  or  arrangement  is proposed  between this
corporation  and  its  creditors  or any  class  of  them  and/or  between  this
corporation  and its  stockholders  or any class of them, any court of equitable
jurisdiction  within the State of Delaware may, on the  application in a summary
way of this  corporation  or of any  creditor or  stockholder  thereof or on the
application of any receiver or receivers  appointed for this  corporation  under
the provisions of section 291 of Title 8 of the Delaware Code order a meeting of
the  creditors or class of  creditors,  and/or of the  stockholders  or class of
stockholders  of this  corporation,  as the case may be, to be  summoned in such
manner  as  the  said  court  directs.  If a  majority  in  number  representing
three-fourths  in value of the  creditors or class of  creditors,  and/or of the
stockholders or class of stockholders of this  corporation,  as the case may be,
agree  to any  compromise  or  arrangement  and to any  reorganization  of  this
corporation  as  consequence  of  such  compromise  or  arrangement,   the  said
compromise or arrangement  and the said  reorganization  shall, if sanctioned by
the court to which the said  application  has been  made,  be binding on all the
creditors  or class of  creditors,  and/or on all the  stockholders  or class of
stockholders,  of  this  corporation,  as the  case  may  be,  and  also on this
corporation.

     EIGHTH:  For the  management  of the  business  and for the  conduct of the
affairs of the corporation, and in further definition, limitation and regulation
of the powers of the corporation and of its directors and of its stockholders or
any class thereof, as the case may be, it is further provided:

          1. The  management  of the  business and the conduct of the affairs of
     the  corporation  shall be vested in its Board of Directors.  The number of
     directors  which shall  constitute  the whole Board of  Directors  shall be
     fixed by, or in the manner  provided  in, the  By-Laws.  The phrase  "whole
     Board" and the phrase "total  number of directors"  shall be deemed to have
     the  same  meaning,  to wit,  the  total  number  of  directors  which  the
     corporation would have if there were no vacancies. No election of directors
     need be by written ballot.

          2. After the original or other  By-Laws of the  corporation  have been
     adopted,  amended, or repealed,  as the case may be, in accordance with the
     provisions  of Section 109 of the General  Corporation  Law of the State of
     Delaware,  and, after the  corporation  has received any payment for any of
     its  stock,  the  power to  adopt,  amend,  or repeal  the  By-Laws  of the
     corporation may be exercised by the Board of Directors of the  corporation;
     provided, however, that any provision for the classification of

<PAGE>



     directors of the corporation for staggered terms pursuant to the provisions
     of  subsection  (d) of Section  141 of the General  Corporation  Law of the
     State of  Delaware  shall be set forth in an initial  By-Law or in a By-Law
     adopted by the  stockholders  entitled  to vote of the  corporation  unless
     provisions for such  classification  shall be set forth in this certificate
     of incorporation.

          3.  Whenever the  corporation  shall be  authorized  to issue only one
     class of stock,  each outstanding share shall entitle the holder thereof to
     notice of, and the right to vote at, any meeting of stockholders.  Whenever
     the corporation  shall be authorized to issue more than one class of stock,
     no  outstanding  share of any class of stock which is denied  voting  power
     under the provisions of the certificate of incorporation  shall entitle the
     holder thereof to the right to vote at any meeting of  stockholders  except
     as the  provisions of paragraph (2) of subsection (b) of section 242 of the
     General  Corporation Law of the State of Delaware shall otherwise  require;
     provided,  that no share of any such class which is otherwise denied voting
     power  shall  entitle  the  holder  thereof  to vote upon the  increase  or
     decrease in the number of authorized shares of said class.

     NINTH: The personal liability of the directors of the corporation is hereby
eliminated to the fullest extent permitted by paragraph (7) of subsection (b) of
Section 102 of the General Corporation Law of the State of Delaware, as the same
may be amended and supplemented.

     TENTH:  The corporation  shall, to the fullest extent  permitted by Section
145 of the General Corporation Law of the State of Delaware,  as the same may be
amended and supplemented, indemnify any and all persons whom it shall have power
to indemnify  under said  section from and against any and all of the  expenses,
liabilities or other matters referred to in or covered by said section,  and the
indemnification  provided for herein shall not be deemed  exclusive of any other
rights to which those  indemnified may be entitled under any By-Law,  agreement,
vote of stockholders or disinterested directors or otherwise,  both as to action
in his official capacity and as to action in another capacity while holding such
office,  and shall  continue  as to a person  who has  ceased to be a  director,
officer,  employee  or agent  and  shall  inure  to the  benefit  of the  heirs,
executors and administrators of such a person.

     ELEVENTH:  From time to time any of the  provisions of this  certificate of
incorporation  may  be  amended,  altered  or  repealed,  and  other  provisions
authorized by the laws of the State of Delaware at the time in

<PAGE>



force may be added or inserted in the manner and at the time  prescribed by said
laws,  and all  rights  at any  time  conferred  upon  the  stockholders  of the
corporation by this  certificate  of  incorporation  are granted  subject to the
provisions of this Article ELEVENTH.


Signed on October 13, 1987.



                                                /s/ T. M. Bonavich
                                                --------------------------
                                                    T. M. Bonovich
                                                    Incorporator

                                          AMENDED AND RESTATED

                                     BYLAWS

                                       OF

                   Asia Pacific Space And Communications, Ltd.

                            (a Delaware corporation)



                                    ARTICLE I

                                  STOCKHOLDERS

                  1. CERTIFICATES  REPRESENTING STOCK. Certificates representing
stock in the corporation  shall be signed by, or in the name of, the corporation
by the Chairman or  Vice-Chairman  of the Board of Directors,  if any, or by the
President or a Vice-President and by the Treasurer or an Assistant  Treasurer or
the  Secretary or an  Assistant  Secretary  of the  corporation.  Any or all the
signatures  on any such  certificate  may be a  facsimile.  In case any officer,
transfer  agent,  or registrar who has signed or whose  facsimile  signature has
been placed upon a certificate  shall have ceased to be such  officer,  transfer
agent, or registrar before such  certificate is issued,  it may be issued by the
corporation with the same effect as if he were such officer,  transfer agent, or
registrar at the date of issue.

                  Whenever the  corporation  shall be  authorized  to issue more
than one  class of stock or more than one  series  of any  class of  stock,  and
whenever  the  corporation  shall  issue any shares of its stock as partly  paid
stock,  the certificates  representing  shares of any such class or series or of
any such partly paid stock shall set forth thereon the statements  prescribed by
the General Corporation Law. Any restrictions on the transfer or registration of
transfer  of any  shares  of  stock  of any  class  or  series  shall  be  noted
conspicuously on the certificate representing such shares.

                  The  corporation  may  issue a new  certificate  of  stock  or
uncertificated  shares  in place of any  certificate  theretofore  issued by it,
alleged to have been lost, stolen, or destroyed,  and the Board of Directors may
require the owner of the lost,  stolen, or destroyed  certificate,  or his legal
representative,  to give the  corporation  a bond  sufficient  to indemnify  the
corporation  against  any claim  that may be made  against  it on account of the
alleged loss,  theft, or destruction of any such  certificate or the issuance of
any such new certificate or uncertificated shares.

<PAGE>



                  2. UNCERTIFICATED SHARES. Subject to any conditions imposed by
the General  Corporation  Law,  the Board of Directors  of the  corporation  may
provide by resolution or  resolutions  that some or all of any or all classes or
series of the stock of the corporation shall be uncertificated  shares. Within a
reasonable time after the issuance or transfer of any uncertificated shares, the
corporation  shall send to the  registered  owner  thereof  any  written  notice
prescribed by the General Corporation Law.

                  3. FRACTIONAL SHARE INTERESTS.  The corporation may, but shall
not be required to,  issue  fractions of a share.  If the  corporation  does not
issue  fractions  of a share,  it  shall  (1)  arrange  for the  disposition  of
fractional  interests by those entitled thereto,  (2) pay in cash the fair value
of  fractions  of a share as of the time when those  entitled  to  receive  such
fractions  are  determined,  or (3) issue scrip or warrants in  registered  form
(either   represented  by  a  certificate  or  uncertificated)  or  bearer  form
(represented by a certificate)  which shall entitle the holder to receive a full
share upon the surrender of such scrip or warrants  aggregating a full share.  A
certificate for a fractional share or an uncertificated  fractional share shall,
but scrip or warrants shall not unless otherwise  provided therein,  entitle the
holder  to  exercise  voting  rights,  to  receive  dividends  thereon,  and  to
participate in any of the assets of the corporation in the event of liquidation.
The Board of Directors  may cause scrip or warrants to be issued  subject to the
conditions  that  they  shall  became  void if not  exchanged  for  certificates
representing  the full shares or  uncertificated  full shares before a specified
date, or subject to the  conditions  that the shares for which scrip or warrants
are  exchangeable  may be  sold by the  corporation  and  the  proceeds  thereof
distributed  to the  holders  of scrip or  warrants,  or  subject  to any  other
conditions which the Board of Directors may impose.

                  4.  STOCK   TRANSFERS.   Upon   compliance   with   provisions
restricting the transfer or registration of transfer of shares of stock, if any,
transfers or  registration  of  transfers of shares of stock of the  corporation
shall be made only on the  stock  ledger of the  corporation  by the  registered
holder  thereof,  or by his attorney  thereunto  authorized by power of attorney
duly executed and filed with the Secretary of the corporation or with a transfer
agent  or a  registrar,  if any,  and,  in the  case of  shares  represented  by
certificates, on surrender of the certificate or certificates for such shares of
stock properly endorsed and the payment of all taxes due thereon.

                  5. RECORD DATE FOR STOCKHOLDERS. In order that the corporation
may determine the  stockholders  entitled to notice of or to vote at any meeting
of  stockholders or any  adjournment  thereof,  the Board of Directors may fix a
record  date,  which  record  date  shall not  precede  the date upon  which the
resolution  fixing the record  date is  adopted by the Board of  Directors,  and
which record date shall not be more than sixty nor less than

<PAGE>



ten days  before  the date of such  meeting.  If no record  date is fixed by the
Board of Directors,  the record date for  determining  stockholders  entitled to
notice  of or to vote at a  meeting  of  stockholders  shall be at the  close of
business  on the day next  preceding  the day on which  notice is given,  or, if
notice is waived,  at the close of business on the day next preceding the day on
which the meeting is held. A determination of stockholders of record entitled to
notice of or to vote at a meeting of stockholders shall apply to any adjournment
of the meeting;  provided,  however,  that the Board of Directors  may fix a new
record  date for the  adjourned  meeting.  In order  that  the  corporation  may
determine the  stockholders  entitled to consent to corporate  action in writing
without a meeting,  the Board of Directors  may fix a record date,  which record
date shall not precede the date upon which the resolution fixing the record date
is adopted by the Board of Directors,  and which date shall not be more than ten
days after the date upon which the resolution  fixing the record date is adopted
by the  Board of  Directors.  If no record  date has been  fixed by the Board of
Directors,  the record date for determining the stockholders entitled to consent
to corporate  action in writing  without a meeting,  when no prior action by the
Board of  Directors  is required by the General  Corporation  Law,  shall be the
first date on which a signed written  consent  setting forth the action taken or
proposed  to be  taken  is  delivered  to the  corporation  by  delivery  to its
registered office in the State of Delaware,  its principal place of business, or
an  officer  or agent of the  corporation  having  custody  of the book in which
proceedings  of meetings of  stockholders  are  recorded.  Delivery  made to the
corporation's  registered  office shall be by hand or by certified or registered
mail, return receipt requested. If no record date has been fixed by the Board of
Directors  and prior action by the Board of Directors is required by the General
Corporation  Law,  the record  date for  determining  stockholders  entitled  to
consent to corporate  action in writing  without a meeting shall be at the close
of business  on the day on which the Board of  Directors  adopts the  resolution
taking  such prior  action.  In order that the  corporation  may  determine  the
stockholders  entitled to receive payment of any dividend or other  distribution
or allotment of any rights or the  stockholders  entitled to exercise any rights
in respect of any change,  conversion,  or exchange of stock, or for the purpose
of any other lawful action,  the Board of Directors may fix a record date, which
record  date shall not  precede  the date upon which the  resolution  fixing the
record date is adopted,  and which record date shall be not more than sixty days
prior  to such  action.  If no  record  date  is  fixed,  the  record  date  for
determining  stockholders for any such purpose shall be at the close of business
on the day on which  the  Board of  Directors  adopts  the  resolution  relating
thereto.

                  6. MEANING OF CERTAIN TERMS.  As used herein in respect of the
right  to  notice  of a  meeting  of  stockholders  or a  waiver  thereof  or to
participate  or vote  thereat  or to  consent or dissent in writing in lieu of a
meeting, as the case may be, the term "share" or "shares" or "share of stock"

<PAGE>



or "shares of stock" or "stockholder" or "stockholders" refers to an outstanding
share or shares of stock and to a holder  or  holders  of record of  outstanding
shares of stock when the  corporation  is  authorized to issue only one class of
shares of stock,  and said reference is also intended to include any outstanding
share or shares of stock and any  holder  or  holders  of record of  outstanding
shares  of stock  of any  class  upon  which or upon  whom  the  certificate  of
incorporation  confers such rights where there are two or more classes or series
of  shares  of stock or upon  which or upon  whom the  General  Corporation  Law
confers such rights  notwithstanding  that the certificate of incorporation  may
provide  for more than one  class or  series of shares of stock,  one or more of
which are limited or denied such rights thereunder;  provided,  however, that no
such  right  shall  vest  in the  event  of an  increase  or a  decrease  in the
authorized  number of shares of stock of any class or series  which is otherwise
denied voting rights under the provisions of the  certificate of  incorporation,
except as any provision of law may otherwise require.

                  7.     STOCKHOLDER MEETINGS.

                  - TIME.  The annual  meeting  shall be held on the date and at
the time fixed,  from time to time, by the directors,  provided,  that the first
annual  meeting  shall  be held  on a date  within  thirteen  months  after  the
organization of the  corporation,  and each  successive  annual meeting shall be
held on a date within  thirteen  months after the date of the  preceding  annual
meeting.  A special  meeting  shall be held on the date and at the time fixed by
the directors.

                  - PLACE. Annual meetings and special meetings shall be held at
such place, within or without the State of Delaware,  as the directors may, from
time to time,  fix.  Whenever the  directors  shall fail to fix such place,  the
meeting shall be held at the registered  office of the  corporation in the State
of Delaware.

                  - CALL.  Annual meetings and special meetings may be called by
the directors or by any officer instructed by the directors to call the meeting.

                  - NOTICE OR WAIVER OF NOTICE.  Written  notice of all meetings
shall be given, stating the place, date, and hour of the meeting and stating the
place  within the city or other  municipality  or community at which the list of
stockholders of the corporation may be examined. The notice of an annual meeting
shall state that the meeting is called for the election of directors and for the
transaction of other  business  which may properly come before the meeting,  and
shall (if any other  action  which could be taken at a special  meeting is to be
taken at such annual  meeting)  state the purpose or  purposes.  The notice of a
special meeting shall in all instances state the

<PAGE>



purpose or purposes  for which the meeting is called.  The notice of any meeting
shall  also  include,   or  be  accompanied   by,  any  additional   statements,
information,  or documents  prescribed by the General Corporation Law. Except as
otherwise  provided by the General  Corporation Law, a copy of the notice of any
meeting shall be given,  personally or by mail,  not less than ten days nor more
than  sixty  days  before  the  date of the  meeting,  unless  the  lapse of the
prescribed  period  of  time  shall  have  been  waived,  and  directed  to each
stockholder  at his record  address or at such other  address  which he may have
furnished by request in writing to the Secretary of the  corporation.  Notice by
mail shall be deemed to be given when deposited,  with postage thereon  prepaid,
in the United States Mail.  If a meeting is adjourned to another time,  not more
than thirty days hence,  and/or to another place,  and if an announcement of the
adjourned time and/or place is made at the meeting, it shall not be necessary to
give notice of the adjourned  meeting unless the directors,  after  adjournment,
fix a new record date for the adjourned meeting. Notice need not be given to any
stockholder who submits a written waiver of notice signed by him before or after
the  time  stated  therein.   Attendance  of  a  stockholder  at  a  meeting  of
stockholders  shall  constitute a waiver of notice of such meeting,  except when
the stockholder attends the meeting for the express purpose of objecting, at the
beginning of the meeting, to the transaction of any business because the meeting
is not lawfully  called or convened.  Neither the business to be transacted  at,
nor the purpose of, any regular or special meeting of the  stockholders  need be
specified in any written waiver of notice.

                  -  STOCKHOLDER  LIST.  The officer who has charge of the stock
ledger of the corporation shall prepare and make, at least ten days before every
meeting  of  stockholders,  a complete  list of the  stockholders,  arranged  in
alphabetical  order,  and showing the address of each stockholder and the number
of shares registered in the name of each stockholder. Such list shall be open to
the  examination  of any  stockholder,  for any purpose  germane to the meeting,
during ordinary  business hours,  for a period of at least ten days prior to the
meeting,  either at a place within the city or other  municipality  or community
where the meeting is to be held, which place shall be specified in the notice of
the  meeting,  or if not so  specified,  at the place where the meeting is to be
held.  The list  shall  also be  produced  and kept at the time and place of the
meeting during the whole time thereof,  and may be inspected by any  stockholder
who is present.  The stock ledger  shall be the only  evidence as to who are the
stockholders  entitled to examine the stock  ledger,  the list  required by this
section  or  the  books  of the  corporation,  or to  vote  at  any  meeting  of
stockholders.

                  - CONDUCT OF MEETING.  Meetings of the  stockholders  shall be
presided over by one of the following  officers in the order of seniority and if
present and acting - the Chairman of the Board, if any, the Vice-Chairman

<PAGE>



 of the Board,  if any,  the  President,  a  Vice-President,  or, if none of the
foregoing is in office and present and acting, by a chairman to be chosen by the
stockholders.  The Secretary of the corporation, or in his absence, an Assistant
Secretary, shall act as secretary of every meeting, but if neither the Secretary
nor an Assistant  Secretary is present the Chairman of the meeting shall appoint
a secretary of the meeting.

                  -  PROXY  REPRESENTATION.   Every  stockholder  may  authorize
another  person or  persons  to act for him by proxy in all  matters  in which a
stockholder  is  entitled  to  participate,  whether  by  waiving  notice of any
meeting,  voting or participating at a meeting, or expressing consent or dissent
without a  meeting.  Every  proxy  must be signed by the  stockholder  or by his
attorney-in-fact.  No proxy  shall be voted or acted upon after three years from
its date unless such proxy provides for a longer  period.  A duly executed proxy
shall be irrevocable  if it states that it is  irrevocable  and, if, and only as
long  as,  it is  coupled  with an  interest  sufficient  in law to  support  an
irrevocable  power.  A proxy may be made  irrevocable  regardless of whether the
interest  with  which it is  coupled is an  interest  in the stock  itself or an
interest in the corporation generally.

                  - INSPECTORS.  The directors,  in advance of any meeting, may,
but need not,  appoint one or more  inspectors of election to act at the meeting
or any adjournment thereof. If an inspector or inspectors are not appointed, the
person  presiding  at the  meeting  may,  but  need  not,  appoint  one or  more
inspectors.  In case any person who may be appointed  as an  inspector  fails to
appear or act, the vacancy may be filled by appointment made by the directors in
advance of the meeting or at the meeting by the person plurality of the votes of
the shares present in person or represented by proxy at the meeting and entitled
to vote on the election of directors.  Any other action shall be authorized by a
majority of the votes cast except where the General Corporation Law prescribes a
different  percentage of votes and/or a different  exercise of voting power, and
except as may be otherwise  prescribed by the  provisions of the  certificate of
incorporation and these Bylaws. In the election of directors,  and for any other
action, voting need not be by ballot.

                  8. STOCKHOLDER ACTION WITHOUT MEETINGS. Any action required by
the  General  Corporation  Law to be taken at any annual or  special  meeting of
stockholders,  or any action which may be taken at any annual or special meeting
of  stockholders,  may be taken  without a  meeting,  without  prior  notice and
without a vote,  if a consent  in  writing,  setting  forth the action so taken,
shall be signed by the  holders of  outstanding  stock  having not less than the
minimum number of votes that would be necessary to authorize or take such action
at a meeting at which all shares  entitled  to vote  thereon  were  present  and
voted.  Prompt notice of the taking of the corporate action without a meeting by
less than unanimous written consent

<PAGE>



shall be given to those  stockholders who have not consented in writing.  Action
taken pursuant to this  paragraph  shall be subject to the provisions of Section
228 of the General Corporation Law.

                                   ARTICLE II

                                    DIRECTORS

                  1. FUNCTIONS AND  DEFINITION.  The business and affairs of the
corporation shall be managed by or under the direction of the Board of Directors
of the  corporation.  The Board of Directors shall have the authority to fix the
compensation of the members thereof.  The use of the phrase "whole board" herein
refers to the total  number of  directors  which the  corporation  would have if
there were no vacancies.

                  2.  QUALIFICATIONS  AND  NUMBER.  A  director  need  not  be a
stockholder,  a citizen of the  United  States,  or a  resident  of the State of
Delaware. The initial Board of Directors shall consist of one person. Thereafter
the number of  directors  constituting  the whole  board  shall be at least one.
Subject to the foregoing limitation and except for the first Board of Directors,
such number may be fixed from time to time by action of the  stockholders  or of
the  directors,  or, if the number is not fixed,  the number  shall be one.  The
number of directors may be increased or decreased by action of the  stockholders
or of the directors.*

                  3. ELECTION AND TERM. The first Board of Directors, unless the
members thereof shall have been named in the certificate of incorporation, shall
be elected by the incorporator or incorporators  and shall hold office until the
first annual meeting of stockholders  and until their successors are elected and
qualified or until their earlier resignation or removal. Any director may resign
at any time upon written notice to the  corporation.  Thereafter,  directors who
are elected at an annual meeting of stockholders, and directors who are elected.
Except as the General  Corporation Law may otherwise require,  in the interim to
fill vacancies and newly created directorships, shall hold office until the next
annual  meeting of  stockholders  and until  their  successors  are  elected and
qualified or until their earlier  resignation or removal. In the interim between
annual meetings of stockholders  or of special  meetings of stockholders  called
for the  election of directors  and/or for the removal of one or more  directors
and  for  the  filling  of  any  vacancy  in  that  connection,   newly  created
directorships  and any vacancies in the Board of Directors,  including  unfilled
vacancies resulting

- --------
*    Maximum  number of  directors  fixed at three as of 14 Oct  1989;  fixed at
     seven as of 22 Jan 1989. 

<PAGE>



from the removal of directors for cause or without  cause,  may be filled by the
vote of a majority of the remaining directors then in office, although less than
a quorum, or by the sole remaining director.

                  4.     MEETINGS.

                  - TIME. Meetings shall be held at such time as the Board shall
fix,  except that the first  meeting of a newly  elected  Board shall be held as
soon after its election as the directors may conveniently assemble.

                  -  PLACE.  Meetings  shall  be held at such  place  within  or
without the State of Delaware as shall be fixed by the Board.

                  - CALL.  No call shall be required  for regular  meetings  for
which the time and place have been fixed.  Special  meetings may be called by or
at the direction of the Chairman of the Board, if any, the  Vice-Chairman of the
Board, if any, of the President, or of a majority of the directors in office.

                  - NOTICE OR ACTUAL OR CONSTRUCTIVE  WAIVER. No notice shall be
required  for  regular  meetings  for which the time and place have been  fixed.
Written,  oral, or any other mode of notice of the time and place shall be given
for  special  meetings in  sufficient  time for the  convenient  assembly of the
directors thereat.  Notice need not be given to any director or to any member of
a committee of directors  who submits a written  waiver of notice  signed by him
before or after the time  stated  therein.  Attendance  of any such  person at a
meeting  shall  constitute  a waiver of notice of such  meeting,  except when he
attends a meeting for the express purpose of objecting,  at the beginning of the
meeting,  to the transaction of any business because the meeting is not lawfully
called or convened.  Neither the business to be  transacted  at, nor the purpose
of, any regular or special  meeting of the  directors  need be  specified in any
written waiver of notice.

                  - QUORUM AND  ACTION.  A  majority  of the whole  Board  shall
constitute a quorum except when a vacancy or vacancies  prevents such  majority,
whereupon a majority  of the  directors  in office  shall  constitute  a quorum,
provided,  that such majority shall  constitute at least  one-third of the whole
Board. A majority of the directors present,  whether or not a quorum is present,
may  adjourn a meeting to another  time and  place.  Except as herein  otherwise
provided,  and except as otherwise provided by the General  Corporation Law, the
vote of the majority of the directors  present at a meeting at which a quorum is
present shall be the act of the Board. The quorum and voting  provisions  herein
stated shall not be construed as conflicting  with any provisions of the General
Corporation  Law and these Bylaws  which  govern a meeting of directors  held to
fill  vacancies  and  newly  created  directorships  in the  Board or  action of
disinterested directors.

<PAGE>




Any member or members of the Board of Directors or of any  committee  designated
by the Board,  may participate in a meeting of the Board, or any such committee,
as the case may be, by means of conference  telephone or similar  communications
equipment  by means of which all persons  participating  in the meeting can hear
each other.

                  - CHAIRMAN OF THE MEETING.  The Chairman of the Board,  if any
and if present  and  acting,  shall  preside  at all  meetings.  Otherwise,  the
Vice-Chairman of the Board, if any and if present and acting,  or the President,
if present and acting, or any other director chosen by the Board, shall preside.

                  5.     REMOVAL OF DIRECTORS.  Except as may otherwise
be provided by the General  Corporation Law, any director or the entire Board of
Directors may be removed, with or without cause, by the holders of a majority of
the shares then entitled to vote at an election of directors.

                  6.  COMMITTEES.  The Board of  Directors  may,  by  resolution
passed by a majority of the whole Board, designate one or more committees,  each
committee  to consist of one or more of the  directors of the  corporation.  The
Board may designate one or more directors as alternate members of any committee,
who may  replace  any  absent  or  disqualified  member  at any  meeting  of the
committee.  In the  absence  or  disqualification  of  any  member  of any  such
committee or committees,  the member or members  thereof  present at any meeting
and not disqualified from voting, whether or not he or they constitute a quorum,
may  unanimously  appoint another member of the Board of Directors to act at the
meeting  in the  place of any  such  absent  or  disqualified  member.  Any such
committee, to the extent provided in the resolution of the Board, shall have and
may  exercise  the  powers  and  authority  of the  Board  of  Directors  in the
management of the business and affairs of the corporation  with the exception of
any  authority  the  delegation  of which is  prohibited  by Section  141 of the
General  Corporation  Law, and may authorize the seal of the  corporation  to be
affixed to all papers which may require it.

                  7.  WRITTEN  ACTION.  Any action  required or  permitted to be
taken at any meeting of the Board of Directors or any  committee  thereof may be
taken  without a meeting if all members of the Board or  committee,  as the case
may be, consent  thereto in writing,  and the writing or writings are filed with
the minutes of proceedings of the Board or committee.



<PAGE>



                                   ARTICLE III

                                    OFFICERS

                  The officers of the corporation  shall consist of a President,
a Secretary, a Treasurer,  and, if deemed necessary,  expedient, or desirable by
the Board of Directors,  a Chairman of the Board, a Vice-Chairman  of the Board,
an  Executive  Vice-President,  one or more other  Vice-Presidents,  one or more
Assistant Secretaries, one or more Assistant Treasurers, and such other officers
with such titles as the resolution of the Board of Directors choosing them shall
designate. Except as may otherwise be provided in the resolution of the Board of
Directors  choosing him, no officer other than the Chairman or  Vice-Chairman of
the Board, if any, need be a director.  Any number of offices may be held by the
same person, as the directors may determine.

                  Unless otherwise provided in the resolution choosing him, each
officer shall be chosen for a term which shall continue until the meeting of the
Board of Directors  following the next annual meeting of stockholders  and until
his successor shall have been chosen and qualified.

                  All officers of the corporation  shall have such authority and
perform such duties in the management and operation of the  corporation as shall
be  prescribed  in the  resolutions  of the Board of Directors  designating  and
choosing such officers and  prescribing  their  authority and duties,  and shall
have such additional authority and duties as are incident to their office except
to the extent that such resolutions may be inconsistent therewith. The Secretary
or an Assistant Secretary of the corporation shall record all of the proceedings
of  all  meetings  and  actions  in  writing  of  stockholders,  directors,  and
committees  of  directors,  and shall  exercise  such  additional  authority and
perform such additional duties as the Board shall assign to him. Any officer may
be removed, with or without cause, by the Board of Directors. Any vacancy in any
office may be filled by the Board of Directors.

                                   ARTICLE IV

                                 CORPORATE SEAL

                  The  corporate  seal  shall  be in such  form as the  Board of
Directors shall prescribe.

<PAGE>









                                    ARTICLE V

                                   FISCAL YEAR

                  The fiscal year of the corporation  shall be fixed,  and shall
be subject to change, by the Board of Directors.

                                   ARTICLE VI

                               CONTROL OVER BYLAWS

                  Subject to the provisions of the certificate of  incorporation
and the provisions of the General Corporation Law, the power to amend, alter, or
repeal  these  Bylaws and to adopt new Bylaws may be  exercised  by the Board of
Directors or by the stockholders.






                          CERTIFICATE OF INCORPORATION

                                       OF

                           ORION ATLANTIC EUROPE, INC.




1.     NAME

                  The name of this  corporation is Orion Atlantic  Europe,  Inc.
(the "Corporation").

2.     REGISTERED OFFICE AND AGENT

                  The registered  office of the Corporation  shall be located at
Corporation Service Comany, 1013 Centre Road, Wilmington,  Delaware 19805 in the
County of New Castle.  The registered  agent of the  Corporation at such address
shall be The Corporation Trust Company.

3.     PURPOSE AND POWERS

                  The purpose of the  Corporation is to engage in any lawful act
or  activity  for  which   corporations  may  be  organized  under  the  General
Corporation  Law of the State of  Delaware,  as amended (the  "Delaware  General
Corporation  Law"). The Corporation shall have all power necessary or helpful to
engage in such acts and activities.

4.     CAPITAL STOCK


         4.1.  Authorized Shares

                  The total  number of shares of all  classes  of stock that the
Corporation  shall have the authority to issue is One Thousand  shares of Common
Stock, all of one class, having a par value of $.01 per share ("Common Stock").

5.     INCORPORATOR; INITIAL DIRECTORS


         5.1.  Incorporator

                  The  name  and  mailing  address  of  the  incorporator   (the
"Incorporator") are Sharon Branscome,  Corporation Service Company,  1013 Centre
Road,

<PAGE>

Wilmington,  DE 19805. The powers of the  Incorporator  shall terminate upon the
filing of this Certificate of Incorporation.

         5.2.  Initial Directors

                  The following persons, having the following mailing addresses,
shall serve as the directors of the  Corporation  until the first annual meeting
of the stockholders of the Corporation or until their successors are elected and
qualified:


         NAME                                      MAILING ADDRESS

John G. Puente                     2440 Research Boulevard, Suite 400, 
                                   Rockville, Maryland 20850

W. Neil Bauer                      2440 Research Boulevard, Suite 400, 
                                   Rockville, Maryland 20850

David J. Frear                     2440 Research Boulevard, Suite 400,
                                   Rockville, Maryland 20850

6.     BOARD OF DIRECTORS


         6.1.  Number; Election

                  The  number  of  directors  of the  Corporation  shall be such
number as from time to time shall be fixed by, or in the manner provided in, the
bylaws of the  Corporation.  Unless and except to the extent  that the bylaws of
the  Corporation  shall  otherwise  require,  the  election of  directors of the
Corporation need not be by written ballot.

         6.2.  Limitation of Liability

                  No  director  of  the  Corporation  shall  be  liable  to  the
Corporation  or its  stockholders  for monetary  damages for breach of fiduciary
duty as a director,  provided that this  provision  shall not eliminate or limit
the liability of a director (a) for any breach of the director's duty of loyalty
to the  Corporation or its  stockholders;  (b) for acts or omissions not in good
faith or which involve intentional misconduct or a knowing violation of law; (c)
for the types of  liability  set forth in Section  174 of the  Delaware  General
Corporation Law; or (d) for any transaction from which the director received any
improper personal benefit.

                                      -2-
<PAGE>

7.     INDEMNIFICATION

                  To the extent  permitted by law, the  Corporation  shall fully
indemnify  any person who was or is a party or is  threatened to be made a party
to any  threatened,  pending or completed  action,  suit or proceeding  (whether
civil,  criminal,  administrative  or  investigative) by reason of the fact that
such  person is or was a director  or officer of the  Corporation,  or is or was
serving at the  request of the  Corporation  as a director or officer of another
corporation,  partnership,  joint venture, trust, employee benefit plan or other
enterprise,  against expenses (including attorneys' fees), judgments,  fines and
amounts paid in settlement  actually and  reasonably  incurred by such person in
connection with such action, suit or proceeding.

                  The Corporation shall advance expenses  (including  attorneys'
fees)  incurred by a director or officer in advance of the final  disposition of
such action,  suit or  proceeding  upon the receipt of an  undertaking  by or on
behalf of the director or officer to repay such amount if it shall ultimately be
determined that such director or officer is not entitled to indemnification.

                  The Corporation  may advance  expenses  (including  attorneys'
fees)  incurred by an employee or agent in advance of the final  disposition  of
such action,  suit or proceeding upon such terms and conditions,  if any, as the
Board of Directors deems appropriate.

8.     AMENDMENT OF BYLAWS

                  In furtherance  and not in limitation of the powers  conferred
by  the  Delaware  General  Corporation  Law,  the  Board  of  Directors  of the
Corporation is expressly authorized and empowered to adopt, amend and repeal the
bylaws of the Corporation.

                                      -3-

<PAGE>



         IN WITNESS WHEREOF, the undersigned, being the Incorporator hereinabove
named, for the purpose of forming a corporation pursuant to the Delaware General
Corporation  Law, hereby certifies that the facts  hereinabove  stated are truly
set forth,  and  accordingly  executes this  Certificate of  Incorporation  this
21 day of August, 1995.
- --


                                                 Inrporator


                                                 By: /s/Sharon Branscome
                                                     ---------------------------

                                      -4-






                           ORION ATLANTIC EUROPE, INC.

                                     BYLAWS






                                     Adopted

                                      as of

                                    August 24, 1995


<PAGE>

                                TABLE OF CONTENTS


                                                                            Page
                                                                            ----

1.
      OFFICES..................................................................1
      1.1.     Registered Office...............................................1
      1.2.     Other Offices...................................................1
2.    MEETINGS OF STOCKHOLDERS.................................................1
      2.1.     Place of Meetings...............................................1
      2.2.     Annual Meetings.................................................1
      2.3.     Special Meetings................................................1
      2.4.     Notice of Meetings..............................................2
      2.5.     Waivers of Notice...............................................2
      2.6.     Business at Special Meetings....................................2
      2.7.     List of Stockholders............................................2
      2.8.     Quorum at Meetings..............................................3
      2.9.     Voting and Proxies..............................................3
      2.10.    Required Vote...................................................3
      2.11.    Action Without a Meeting........................................4
3.
      DIRECTORS................................................................4
      3.1.     Powers..........................................................4
      3.2.     Number and Election.............................................4
      3.3.     Nomination of Directors.........................................4
      3.4.     Vacancies.......................................................5
      3.5.     Meetings........................................................5
               3.5.1.  Regular Meetings........................................5
               3.5.2.  Special Meetings........................................5
               3.5.3.  Telephone Meetings......................................6
               3.5.4.  Action Without Meeting..................................6
               3.5.5.  Waiver of Notice of Meeting.............................6
      3.6.     Quorum and Vote at Meetings.....................................6
      3.7.     Committees of Directors.........................................6
      3.8.     Compensation of Directors.......................................7
4.
      OFFICERS.................................................................7
      4.1.     Positions.......................................................7
      4.2.     President.......................................................7
      4.3.     Vice President..................................................8
      4.4.     Secretary.......................................................8
      4.5.     Assistant Secretary.............................................8
      4.6.     Treasurer.......................................................8
      4.7.     Assistant Treasurer.............................................8
      4.8.     Term of Office..................................................8
      4.9.     Compensation....................................................9
      4.10.    Fidelity Bonds..................................................9

                                      -i-

<PAGE>



5.    CAPITAL STOCK............................................................9
      5.1.     Certificates of Stock; Uncertificated Shares....................9
      5.2.     Lost Certificates...............................................9
      5.3.     Record Date....................................................10
               5.3.1.  Actions by Stockholders................................10
               5.3.2.  Payments ..............................................10
      5.4.     Stockholders of Record.........................................11
6.    INSURANCE...............................................................11
7.    GENERAL PROVISIONS......................................................11
      7.1.     Inspection of Books and Records................................11
      7.2.     Dividends......................................................12
      7.3.     Reserves.......................................................12
      7.4.     Execution of Instruments.......................................12
      7.5.     Fiscal Year....................................................12
      7.6.     Seal...........................................................12
8.
      AMENDMENT...............................................................12

                                      -ii-
<PAGE>





'

                                     BYLAWS

                                       OF

                           ORION ATLANTIC EUROPE, INC.



1.   OFFICES


         1.1.     Registered Office

                  The initial  registered  office of the Corporation shall be in
Wilmington,  Delaware,  and the initial registered agent in charge thereof shall
be Corporation Service Company.

         1.2.     Other Offices

                  The  Corporation  may also have offices at such other  places,
both within and without the State of  Delaware,  as the Board of  Directors  may
from time to time determine or as may be necessary or useful in connection  with
the business of the Corporation.

2.   MEETINGS OF STOCKHOLDERS


         2.1.     Place of Meetings

                  All meetings of the  stockholders  shall be held at such place
as may be fixed from time to time by the Board of Directors.

         2.2.     Annual Meetings

                  The Corporation  shall hold annual  meetings of  stockholders,
commencing  with the year 1996,  on the first  Thursday  of May,  if not a legal
holiday, and if a legal holiday, then on the next secular day following, at 2:00
p.m., or at such other date and time as shall be designated from time to time by
the Board of  Directors,  and stated in the  notice of the  meeting or in a duly
executed waiver thereof,  at which stockholders shall elect a Board of Directors
and transact such other business as may properly be brought before the meeting.

         2.3.     Special Meetings

                  Special  meetings  of the  stockholders,  for any  purpose  or
purposes,  unless otherwise prescribed by statute, may be called by the Board of
Directors or the President, and shall be called by the President or Secretary at
the request in writing of stockholders owning a majority in amount of the entire
capital stock of 

<PAGE>

the Corporation  issued and outstanding and entitled to vote. Such request shall
include a statement of the purpose or purposes of the proposed meeting.

         2.4.     Notice of Meetings

                  Written  notice of any  meeting of  stockholders,  stating the
place,  date and  hour of the  meeting,  and (if it is a  special  meeting)  the
purpose or  purposes  for which the  meeting  is called,  shall be given to each
stockholder  entitled  to vote at such  meeting  not less than ten nor more than
sixty days before the date of the meeting (except to the extent that such notice
is waived or is not required as provided in the General  Corporation  Law of the
State of Delaware,  as amended (the "Delaware General Corporation Law") or these
Bylaws).  Such notice  shall be given in  accordance  with,  and shall be deemed
effective  as set  forth  in,  Section  222 (or any  successor  section)  of the
Delaware General Corporation Law.

         2.5.     Waivers of Notice

                  Whenever the giving of any notice is required by statute,  the
Certificate of Incorporation  or these Bylaws, a waiver thereof,  in writing and
delivered to the  Corporation,  signed by the person or persons entitled to said
notice,  whether  before or after the event as to which such notice is required,
shall be deemed  equivalent to notice.  Attendance of a stockholder at a meeting
shall  constitute  a waiver  of  notice  (1) of such  meeting,  except  when the
stockholder  at the  beginning of the meeting  objects to holding the meeting or
transacting  business at the  meeting,  and (2) (if it is a special  meeting) of
consideration  of a  particular  matter at the  meeting  that is not  within the
purpose or purposes  described  in the meeting  notice,  unless the  stockholder
objects to considering the matter at the beginning of the meeting.

         2.6.     Business at Special Meetings

                  Business  transacted  at any special  meeting of  stockholders
shall be limited to the purposes stated in the notice (except to the extent that
such notice is waived or is not  required as  provided in the  Delaware  General
Corporation Law or these Bylaws).

         2.7.     List of Stockholders

                  After the record date for a meeting of  stockholders  has been
fixed, at least ten days before such meeting,  the officer who has charge of the
stock ledger of the Corporation  shall make a list of all stockholders  entitled
to vote at the meeting,  arranged in alphabetical  order and showing the address
of each  stockholder  and the  number of shares  registered  in the name of each
stockholder.  Such list shall be open to the  examination of any stockholder for
any purpose germane to the meeting, during ordinary business hours, for a period
of at least ten days prior to the  meeting,  either at a place in the city where
the meeting is to be held,  which place is to be  specified in the notice of the
meeting,  or at the place where the meeting is to be held. Such list shall also,
for the duration of the meeting, be produced and kept 

                                      -2-
<PAGE>

open to the  examination of any stockholder who is present at the time and place
of the  meeting.  Such  list  shall  be the  only  evidence  as to who  are  the
stockholders  entitled to examine the list, the list required by this section or
the books of the Corporation, or to vote in person or by proxy at any meeting of
stockholders.

         2.8.     Quorum at Meetings

                  Stockholders  may take action on a matter at a meeting only if
a quorum  exists with  respect to that matter.  Except as otherwise  provided by
statute or by the Certificate of Incorporation, the holders of a majority of the
stock issued and  outstanding  and entitled to vote at the meeting,  and who are
present in person or  represented  by proxy,  shall  constitute  a quorum at all
meetings of the  stockholders  for the transaction of business.  Once a share is
represented  for any  purpose at a meeting  (other  than solely to object (1) to
holding the meeting or transacting  business at the meeting,  or (2) (if it is a
special meeting) to consideration of a particular  matter at the meeting that is
not within the  purpose or purposes  described  in the  meeting  notice),  it is
deemed present for quorum  purposes for the remainder of the meeting and for any
adjournment  of that meeting  unless a new record date is or must be set for the
adjourned meeting. The holders of a majority of the voting shares represented at
a meeting,  whether or not a quorum is present,  may adjourn  such  meeting from
time to time.  At the  adjourned  meeting at which a quorum  shall be present or
represented,  any business may be transacted which might have been transacted at
the original  meeting.  If the  adjournment  is for more than thirty days, or if
after the  adjournment a new record date is fixed for the adjourned  meeting,  a
notice of the  adjourned  meeting shall be given to each  stockholder  of record
entitled to vote at the meeting.

         2.9.     Voting and Proxies

                  Unless otherwise provided in the Delaware General  Corporation
Law or in the Certificate of Incorporation,  and subject to the other provisions
of these Bylaws,  each stockholder shall be entitled to one vote on each matter,
in person or by proxy,  for each share of the  Corporation's  capital stock that
has voting power and that is held by such  stockholder.  No proxy shall be voted
or acted upon after three years from its date,  unless the proxy  provides for a
longer period. A duly executed  appointment of proxy shall be irrevocable if the
appointment  form states that it is irrevocable  and if, and only as long as, it
is coupled with an interest sufficient in law to support an irrevocable power.

         2.10.    Required Vote

                  If a  quorum  exists,  action  on a  matter  (other  than  the
election of  directors) is approved if the votes cast favoring the action exceed
the votes cast opposing the action,  unless the Certificate of  Incorporation or
the Delaware  General  Corporation  Law requires a greater number of affirmative
votes (in which case such different requirement shall apply). Directors shall be
elected by a plurality  of the 

                                      -3-
<PAGE>

votes cast by the shares  entitled  to vote in the  election  (provided a quorum
exists), and the election of directors need not be by written ballot.

         2.11.    Action Without a Meeting

                  Any  action   required   or   permitted   to  be  taken  at  a
stockholders'  meeting may be taken  without a meeting if the action is taken by
persons who would be  entitled  to vote at a meeting and who hold shares  having
voting  power to cast not less than the  minimum  number of votes  that would be
necessary to authorize or take the action at a meeting at which all stockholders
entitled to vote were present and voted.  The action must be evidenced by one or
more written  consents  describing the action taken,  signed by the stockholders
entitled to take action without a meeting,  and delivered to the Corporation for
inclusion  in the  minute  book.  No  consent  shall  be  effective  to take the
corporate action  specified unless the number of consents  required to take such
action are delivered to the Corporation within sixty days of the delivery of the
earliest-dated  consent. All stockholders entitled to vote on the record date of
such written  consent who do not participate in taking the action shall be given
written notice thereof in accordance with the Delaware General Corporation Law.

3.   DIRECTORS


         3.1.     Powers

                  The business and affairs of the  Corporation  shall be managed
by or under the direction of the Board of Directors, which may exercise all such
powers of the Corporation and do all such lawful acts and things, subject to any
limitation  set forth in the  Certificate  of  Incorporation,  these Bylaws,  or
agreements among stockholders which are otherwise lawful.

         3.2.     Number and Election

                  The number of directors which shall constitute the whole board
shall not be fewer than one nor more than ten. The first board shall  consist of
three directors.  Thereafter,  within the limits above specified,  the number of
directors shall be determined by resolution of the Board of Directors.

         3.3.     Nomination of Directors

                  The Board of Directors shall nominate  candidates to stand for
election  as  directors;  and  other  candidates  also may be  nominated  by any
Corporation  stockholder,  provided  such other  nomination(s)  are submitted in
writing to the Secretary of the  Corporation  no later than 90 days prior to the
meeting of stockholders at which such directors are to be elected, together with
the identity of the nominor and the number of shares of the Corporation's  stock
owned, directly or indirectly, by the nominor. The directors shall be elected at
the annual  meeting of the  stockholders,  except as  provided  in Section  3.4.
hereof,  and each  director  elected  

                                      -4-
<PAGE>

shall hold office until such  director's  successor is elected and  qualified or
until the  director's  earlier  resignation  or removal.  Directors  need not be
stockholders.

         3.4.     Vacancies

                  Vacancies and newly created  directorships  resulting from any
increase in the authorized number of directors may be filled by the stockholders
or by a majority of the directors then in office,  although fewer than a quorum,
or by a sole remaining director. Each director so chosen shall hold office until
the next election of directors,  and until such director's  successor is elected
and qualified,  or until the director's earlier  resignation or removal.  In the
event that one or more directors  resigns from the board,  effective at a future
date, a majority of the directors  then in office,  including  those who have so
resigned,  shall have power to fill such vacancy or vacancies,  the vote thereon
to take effect when such resignation or resignations shall become effective, and
each  director so chosen shall hold office until the next election of directors,
and until such  director's  successor  is elected  and  qualified,  or until the
director's  earlier  resignation  or  removal.  In the  event  that  one or more
directors resigns from the board,  effective at a future date, a majority of the
directors then in office, including those who have so resigned, shall have power
to fill such  vacancy or  vacancies,  the vote  thereon to take effect when such
resignation or resignations shall become effective,  and each director so chosen
shall hold office  until the next annual  election  and until his  successor  is
elected and qualified, or until his earlier resignation or removal.

         3.5.     Meetings

                  3.5.1.   Regular Meetings

                  Regular meetings of the Board of Directors may be held without
notice at such time and at such place as shall  from time to time be  determined
by the Board of Directors.

                  3.5.2.   Special Meetings

                  Special  meetings of the Board may be called by the  President
on one day's notice to each director, either personally or by telephone, express
delivery service (so that the scheduled  delivery date of the notice is at least
one day in advance of the meeting),  telegram or facsimile transmission,  and on
five days' notice by mail  (effective  upon deposit of such notice in the mail).
The notice need not describe the purpose of a special meeting.

                  3.5.3.   Telephone Meetings

                  Members of the Board of Directors may participate in a meeting
of the board by any communication by means of which all participating  directors
can simultaneously hear each other during the meeting. A director  participating
in a meeting by this means is deemed to be present in person at the meeting.

                                      -5-
<PAGE>

                  3.5.4.   Action Without Meeting

                  Any action required or permitted to be taken at any meeting of
the Board of Directors  may be taken without a meeting if the action is taken by
all members of the Board.  The action must be  evidenced  by one or more written
consents describing the action taken, signed by each director,  and delivered to
the Corporation for inclusion in the minute book.

                  3.5.5.   Waiver of Notice of Meeting

                  A  director  may waive any notice  required  by  statute,  the
Certificate of  Incorporation  or these Bylaws before or after the date and time
stated in the notice.  Except as set forth below, the waiver must be in writing,
signed by the director entitled to the notice,  and delivered to the Corporation
for inclusion in the minute book.  Notwithstanding  the foregoing,  a director's
attendance at or  participation  in a meeting waives any required  notice to the
director of the meeting  unless the  director  at the  beginning  of the meeting
objects to holding the meeting or  transacting  business at the meeting and does
not thereafter vote for or assent to action taken at the meeting.

         3.6.     Quorum and Vote at Meetings

                  At all  meetings  of the  board,  a  quorum  of the  Board  of
Directors  consists of a majority of the total  number of  directors  prescribed
pursuant to Section  3.2. of these Bylaws (or, if no number is  prescribed,  the
number in office immediately before the meeting begins).  The vote of a majority
of the directors  present at any meeting at which there is a quorum shall be the
act of the Board of Directors,  except as may be otherwise specifically provided
by statute or by the Certificate of Incorporation or by these bylaws.

         3.7.     Committees of Directors

                  The Board of Directors  may by  resolution  create one or more
committees  and  appoint  members  of the  Board  of  Directors  to serve on the
committees at the pleasure of the Board of Directors. To the extent specified in
a resolution adopted by the Board of Directors,  each committee may exercise the
full  authority of the Board of Directors,  except as limited by Section 141 (or
any successor  section) of the Delaware General  Corporation Law. All provisions
of the Delaware  General  Corporation Law and these Bylaws relating to meetings,
action  without  meetings,  notice (and waiver  thereof),  and quorum and voting
requirements  of the Board of Directors  apply,  as well, to such committees and
their members.

         3.8.     Compensation of Directors

                  The Board of  Directors  shall have the  authority  to fix the
compensation of directors.  The directors may be paid their expenses, if any, of

                                      -6-
<PAGE>

attendance at each meeting of the board of directors and may be paid a fixed sum
for  attendance  at each meeting of the board of directors or a stated salary as
director.  No  such  payment  shall  preclude  any  director  from  serving  the
corporation in any other capacity and receiving compensation  therefor.  Members
of special or standing  committees may be paid like  compensation  for attending
committee meetings.

4.   OFFICERS


         4.1.     Positions

                  The  officers  of the  Corporation  shall be, a  President,  a
Secretary and a Treasurer, and such other officers as the Board of Directors (or
an officer  authorized by the Board of Directors) from time to time may appoint,
including one or more,  Executive Vice Presidents,  Vice  Presidents,  Assistant
Secretaries  and Assistant  Treasurers.  Each such officer  shall  exercise such
powers and perform such duties as shall be set forth below and such other powers
and duties as from time to time may be specified by the Board of Directors or by
any  officer(s)  authorized by the Board of Directors to prescribe the duties of
such  other  officers.  Any number of  offices  may be held by the same  person,
except  that in no event  shall  the  President  and the  Secretary  be the same
person.  Each of the,  President,  and/or any Vice  President may execute bonds,
mortgages and other  documents under the seal of the  Corporation,  except where
required or  permitted  by law to be  otherwise  executed  and except  where the
execution thereof shall be expressly delegated by the Board of Directors to some
other officer or agent of the Corporation.

         4.2.     President

                  The  President  shall be the chief  operating  officer  of the
Corporation and shall have full  responsibility  and authority for management of
the day-to-day  operations of the  Corporation,  subject to the authority of the
Board of  Directors.  The  President  may  execute  bonds,  mortgages  and other
contracts, under the seal of the Corporation, if required, except where required
or  permitted  by law to be  otherwise  signed and executed and except where the
signing and  execution  thereof  shall be  expressly  delegated  by the Board of
Directors to some other officer or agent of the Corporation.

         4.3.     Vice President

                  In  the  absence  of the  President  or in  the  event  of the
President's  inability  or refusal to act, the Vice  President  (or in the event
there  be more  than one  Vice  President,  the  Vice  Presidents  in the  order
designated,  or in the  absence of any  designation,  then in the order of their
election)  shall perform the duties of the  President,  and when so acting shall
have all the  powers  of,  and be  subject  to all the  restrictions  upon,  the
President.

                                      -7-
<PAGE>

         4.4.     Secretary

                  The Secretary  shall have  responsibility  for  preparation of
minutes of meetings of the Board of Directors  and of the  stockholders  and for
authenticating records of the Corporation. The Secretary shall give, or cause to
be given, notice of all meetings of the stockholders and special meetings of the
Board of Directors.  The Secretary or an Assistant Secretary may also attest all
instruments signed by any other officer of the Corporation.

         4.5.     Assistant Secretary

                  The  Assistant  Secretary,  or if there be more than one,  the
Assistant  Secretaries in the order  determined by the Board of Directors (or if
there  shall  have  been  no such  determination,  then in the  order  of  their
election),  shall,  in the  absence  of the  Secretary  or in the  event  of the
Secretary's  inability  or refusal to act,  perform the duties and  exercise the
powers of the Secretary.

         4.6.     Treasurer

                  The  Treasurer  shall be the chief  financial  officer  of the
Corporation and shall have responsibility for the custody of the corporate funds
and securities  and shall see to it that full and accurate  accounts of receipts
and disbursements are kept in books belonging to the Corporation.  The Treasurer
shall render to, the  President,  and the Board of Directors,  upon request,  an
account of all  financial  transactions  and of the  financial  condition of the
Corporation.

         4.7.     Assistant Treasurer

                  The Assistant  Treasurer,  or if there shall be more than one,
the Assistant  Treasurers in the order  determined by the Board of Directors (or
if there  shall  have  been no such  determination,  then in the  order of their
election),  shall,  in the  absence  of the  Treasurer  or in the  event  of the
Treasurer's  inability  or refusal to act,  perform the duties and  exercise the
powers of the Treasurer.

         4.8.     Term of Office

                  The officers of the Corporation  shall hold office until their
successors are chosen and qualify or until their earlier resignation or removal.
Any officer may resign at any time upon written notice to the  Corporation.  Any
officer  elected or appointed  by the Board of  Directors  may be removed at any
time, with or without cause, by the affirmative  vote of a majority of the Board
of Directors.

         4.9.     Compensation

                  The compensation of officers of the Corporation shall be fixed
by the  Board of  Directors  or by any  officer(s)  authorized  by the  Board of
Directors to prescribe the compensation of such other officers.

                                      -8-
<PAGE>


         4.10.    Fidelity Bonds

                  The  Corporation  may secure the fidelity of any or all of its
officers or agents by bond or otherwise.

5.   CAPITAL STOCK


         5.1.     Certificates of Stock; Uncertificated Shares

                  The  shares  of  the  Corporation   shall  be  represented  by
certificates,  provided  that the Board of Directors  may provide by  resolution
that some or all of any or all  classes  or series  of the  Corporation's  stock
shall be  uncertificated  shares.  Any such resolution shall not apply to shares
represented  by a  certificate  until such  certificate  is  surrendered  to the
Corporation.  Notwithstanding  the adoption of such a resolution by the Board of
Directors,  every holder of stock represented by certificates,  and upon request
every holder of uncertificated  shares,  shall be entitled to have a certificate
(representing the number of shares registered in certificate form) signed in the
name of the  Corporation  by the  President  or any Vice  President,  and by the
Treasurer,  Secretary or any Assistant  Treasurer or Assistant  Secretary of the
Corporation.  Any or all the signatures on the certificate may be facsimile.  In
case any  officer,  transfer  agent or  registrar  whose  signature or facsimile
signature  appears  on a  certificate  shall  have  ceased  to be such  officer,
transfer agent or registrar before such certificate is issued,  it may be issued
by the  Corporation  with the same effect as if such  person were such  officer,
transfer agent or registrar at the date of issue.

         5.2.     Lost Certificates

                  The Board of  Directors,  President or Secretary  may direct a
new  certificate of stock to be issued in place of any  certificate  theretofore
issued by the  Corporation  and alleged to have been lost,  stolen or destroyed,
upon the making of an  affidavit  of that fact by the person  claiming  that the
certificate of stock has been lost,  stolen or destroyed.  When authorizing such
issuance of a new certificate, the board or any such officer may, as a condition
precedent to the  issuance  thereof,  require the owner of such lost,  stolen or
destroyed certificate or certificates, or such owner's legal representative,  to
advertise  the same in such manner as the board or such  officer  shall  require
and/or to give the  Corporation a bond, in such sum as the board or such officer
may  direct,  as  indemnity  against  any  claim  that may be made  against  the
Corporation on account of the certificate  alleged to have been lost,  stolen or
destroyed   or  on  account  of  the  issuance  of  such  new   certificate   or
uncertificated shares.

                                      -9-
<PAGE>


         5.3.     Record Date

                  5.3.1.   Actions by Stockholders

                  In order that the Corporation  may determine the  stockholders
entitled to notice of or to vote at any meeting of stockholders  (or to take any
other action),  the Board of Directors may fix a record date,  which record date
shall not precede the date upon which the  resolution  fixing the record date is
adopted by the Board of  Directors  and shall not be less than ten nor more than
sixty  days  before  the  meeting  or  action   requiring  a  determination   of
stockholders.

                  In order that the Corporation  may determine the  stockholders
entitled  to  consent  to  corporate  action  without  a  meeting,  the Board of
Directors  may fix a record  date,  which record date shall not precede the date
upon which the  resolution  fixing  the  record  date is adopted by the Board of
Directors  and  shall not be more  than ten days  after the date upon  which the
resolution fixing the record date is adopted by the Board of Directors.

                  A  determination  of stockholders of record entitled to notice
of or to vote at a meeting of stockholders shall apply to any adjournment of the
meeting, unless the Board of Directors fixes a new record date.

                  If no  record  date is fixed by the  Board of  Directors,  the
record date shall be at the close of business on the day next  preceding the day
on which  notice is given,  or if notice is not  required  or is waived,  at the
close of business on the day next preceding the day on which the meeting is held
or such other action is taken,  except that (if no record date is established by
the Board of Directors) the record date for determining stockholders entitled to
consent  to  corporate  action  without a meeting  is the first  date on which a
stockholder  delivers a signed written  consent to the Corporation for inclusion
in the minute book.

                  5.3.2.   Payments

                  In order that the Corporation  may determine the  stockholders
entitled to receive  payment of any dividend or other  distribution or allotment
of any rights or the stockholders  entitled to exercise any rights in respect of
any change,  conversion  or  exchange of stock,  or for the purpose of any other
lawful action,  the Board of Directors may fix a record date,  which record date
shall not precede the date upon which the  resolution  fixing the record date is
adopted,  and which  record date shall be not more than sixty days prior to such
action. If no record date is fixed, the record date for determining stockholders
for any such  purpose  shall be at the close of business on the day on which the
Board of Directors adopts the resolution relating thereto.

                                      -10-

<PAGE>

         5.4.     Stockholders of Record

                  The  Corporation  shall be entitled to recognize the exclusive
right of a person  registered  on its books as the  owner of  shares to  receive
dividends, to receive notifications,  to vote as such owner, and to exercise all
the  rights  and  powers  of an  owner.  The  Corporation  shall not be bound to
recognize any equitable or other claim to or interest in such share or shares on
the part of any other  person,  whether  or not it shall  have  express or other
notice  thereof,  except as otherwise  may be provided by the  Delaware  General
Corporation Law.

6.   INSURANCE

                  The Corporation may purchase and maintain  insurance on behalf
of any  person  who is or was a  director,  officer,  employee  or  agent of the
Corporation  (or is or  was  serving  at the  request  of the  Corporation  as a
director,  officer,  partner, trustee, employee or agent of another corporation,
partnership,  joint venture,  trust,  employee benefit plan or other enterprise)
against  liability  asserted against or incurred by such person in such capacity
or arising from such  person's  status as such  (whether or not the  Corporation
would have the power to indemnify such person against the same liability).

7.   GENERAL PROVISIONS


         7.1.     Inspection of Books and Records

                  Any  stockholder,  in person or by  attorney  or other  agent,
shall,  upon written  demand under oath  stating the purpose  thereof,  have the
right during the usual hours for business to inspect for any proper  purpose the
Corporation's stock ledger, a list of its stockholders,  and its other books and
records, and to make copies or extracts therefrom. A proper purpose shall mean a
purpose reasonably related to such person's interest as a stockholder.  In every
instance  where an  attorney  or other  agent  shall be the person who seeks the
right to  inspection,  the demand under oath shall be  accompanied by a power of
attorney or such other writing which  authorizes  the attorney or other agent to
so act on behalf of the stockholder.  The demand under oath shall be directed to
the Corporation at its registered office or at its principal place of business.

         7.2.     Dividends

                  The Board of Directors may declare  dividends upon the capital
stock of the  Corporation,  subject  to the  provisions  of the  Certificate  of
Incorporation and the laws of the State of Delaware.

                                      -11-
<PAGE>

         7.3.     Reserves

                  The  directors of the  Corporation  may set apart,  out of the
funds of the Corporation available for dividends,  a reserve or reserves for any
proper purpose and may abolish any such reserve.

         7.4.     Execution of Instruments

                  All checks,  drafts or other  orders for the payment of money,
and  promissory  notes of the  Corporation  shall be signed by such  officer  or
officers or such other person or persons as the Board of Directors may from time
to time designate.

         7.5.     Fiscal Year

                  The  fiscal  year  of  the  Corporation   shall  be  fixed  by
resolution of the Board of Directors.

         7.6.     Seal

                  The  corporate  seal  shall  be in such  form as the  Board of
Directors  shall  approve.  The seal may be used by  causing  it or a  facsimile
thereof to be impressed or affixed or otherwise reproduced.

8.       AMENDMENT

                  These  bylaws  may be  altered,  amended or  repealed  and new
bylaws may be adopted by the Board of Directors.


                                      -12-

<PAGE>



                                   * * * * *


                  The foregoing Bylaws were adopted by the Board of Directors on
Aug. 24, 1995.
- -------
                                               /s/Richard H. Shay
                                               ---------------------------------
                                               Secretary










                           ORION NEWCO SERVICES, INC.,
                                   as Issuer,


                                       and


                             BANKERS TRUST COMPANY
                                   as Trustee




                            -------------------------

                             Senior Notes Indenture

                       Dated as of [_______________], 1997

                            -------------------------



                        [________]% Senior Notes due 2007






<PAGE>









                              CROSS-REFERENCE TABLE



TIA Sections      Indenture Sections

ss. 310(a)(1).............................................................7.10
       (a)(2).............................................................7.10
       (b)................................................................7.08
ss. 313(c)................................................................7.06
ss. 314(a)................................................................4.18
       (a)(4).............................................................4.19
ss. 315(b)................................................................7.05
ss. 316(a)(1)(A)..........................................................6.05
       (a)(1)(B)..........................................................6.04
       (b)................................................................6.07
ss. 317(a)(1).............................................................6.08
       (a)(2).............................................................6.09



















- ----------

Note:   The Cross-Reference Table  shall  not for any  purpose be deemed to be a
        part of the Indenture.


<PAGE>








                                TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                                                            Page

<S>                                                                               <C>
RECITALS OF THE COMPANY                                                           1 
                                                                                    
                               ARTICLE ONE                                          
               DEFINITIONS AND INCORPORATION BY REFERENCE                           
                                                                                    
SECTION 1.01.  Definitions                                                        2 
SECTION 1.02.  Incorporation by Reference of Trust Indenture Act                 21 
SECTION 1.03.  Rules of Construction                                             21 
                                                                                    
                               ARTICLE TWO                                          
                                THE NOTES                                           
SECTION 2.01   Form and Dating                                                   22 
SECTION 2.02.  Execution and Authentication                                      23 
SECTION 2.03.  Registrar and Paying Agent                                        24 
SECTION 2.04.  Holders to Be Treated as Owners; Payments of Interest             24 
SECTION 2.05.  Paying Agent to Hold Money in Trust                               25 
SECTION 2.06.  Holder Lists                                                      26 
SECTION 2.07.  Transfer and Exchange                                             26 
SECTION 2.08.  Replacement Notes                                                 29 
SECTION 2.09.  Outstanding Notes                                                 30 
SECTION 2.10.  Treasury Notes                                                    30 
SECTION 2.11.  Temporary Notes                                                   30 
SECTION 2.12.  Cancellation                                                      31 
SECTION 2.13.  Defaulted Interest                                                31 
SECTION 2.14.  CUSIP, CINS or ISIN Number                                        31 
SECTION 2.15.  Deposit of Moneys                                                 31 
                                                                                    
                              ARTICLE THREE                                         
                               REDEMPTION                                           
                                                                                    
SECTION 3.01.  Right of Redemption                                               32 
SECTION 3.02.  Notices to Trustee                                                32 
SECTION 3.03.  Selection of Notes to Be Redeemed                                 32 
SECTION 3.04.  Notice of Redemption                                              33 
SECTION 3.05.  Deposit of Redemption Price                                       34 
SECTION 3.06.  Payment of Notes Called for Redemption                            34 
SECTION 3.07.  Notes Redeemed in Part                                            34
<PAGE>
 
                                                                                 
                                  ARTICLE FOUR
                                    COVENANTS

SECTION 4.01.  Payment of Notes                                                  34
SECTION 4.02.  Issuances of Guarantees by New Restricted Subsidiaries            35
SECTION 4.03.  Limitation on Indebtedness                                        35
SECTION 4.04.  Limitation on Restricted Payments                                 37
SECTION 4.05.  Limitation on Dividend and Other Payment Restrictions Affect-
                ing Restricted Subsidiaries                                      40
SECTION 4.06.  Limitation on the Issuance of Capital Stock of Restricted
                Subsidiaries                                                     41
SECTION 4.07.  Limitation on Issuances of Guarantees by Restricted
                Subsidiaries                                                     42
SECTION 4.08.  Limitation on Transactions with Shareholders and Affiliates       42
SECTION 4.09.  Limitation on Liens                                               43
SECTION 4.10.  Limitation on Sale-Leaseback Transactions                         43
SECTION 4.11.  Limitation on Asset Sales                                         44
SECTION 4.12.  Maintenance of Office or Agency                                   45
SECTION 4.13.  Repurchase of Notes upon a Change of Control                      45
SECTION 4.14.  Existence                                                         45
SECTION 4.15.  Payment of Taxes and Other Claims                                 45
SECTION 4.16.  Maintenance of Properties and Insurance                           46
SECTION 4.17.  Notice of Defaults                                                47
SECTION 4.18.  Commission Reports and Reports to Holders                         47
SECTION 4.19.  Waiver of Stay, Extension or Usury Laws                           47

                                  ARTICLE FIVE
                              SUCCESSOR CORPORATION

SECTION 5.01.  Consolidation, Merger and Sale of Assets                          48
SECTION 5.02.  Successor Substituted                                             49

                                   ARTICLE SIX
                              DEFAULT AND REMEDIES

SECTION 6.01.  Events of Default                                                 49
SECTION 6.02.  Acceleration                                                      51
SECTION 6.03.  Other Remedies                                                    51
SECTION 6.04.  Waiver of Past Defaults                                           51
SECTION 6.05.  Control by Majority                                               51
SECTION 6.06.  Limitation on Suits                                               52
SECTION 6.07.  Rights of Holders to Receive Payment                              52
SECTION 6.08.  Collection of Indebtedness and Suits for Enforcement by Trustee   52
SECTION 6.09.  Trustee May File Proofs of Claim                                  53
SECTION 6.10.  Priorities                                                        54
SECTION 6.11.  Undertaking for Costs                                             54
SECTION 6.12.  Restoration of Rights and Remedies                                54
SECTION 6.13.  Rights and Remedies Cumulative                                    55
SECTION 6.14.  Delay or Omission Not Waiver                                      55
<PAGE>

                                  ARTICLE SEVEN
                                     TRUSTEE

SECTION 7.01.  General                                                           55
SECTION 7.02.  Certain Rights of Trustee 55
SECTION 7.03.  Individual Rights of Trustee                                      57
SECTION 7.04.  Trustee's Disclaimer                                              57
SECTION 7.05.  Notice of Default                                                 57
SECTION 7.06.  Reports by Trustee to Holders                                     57
SECTION 7.07.  Compensation and Indemnity                                        58
SECTION 7.08.  Replacement of Trustee                                            58
SECTION 7.09.  Successor Trustee by Merger, Etc                                  59
SECTION 7.10.  Eligibility                                                       59
SECTION 7.11.  Money Held in Trust                                               59
SECTION 7.12.  Withholding Taxes                                                 60

                                  ARTICLE EIGHT
                             DISCHARGE OF INDENTURE

SECTION 8.01.  Termination of Company's Obligations                               60
SECTION 8.02.  Defeasance and Discharge of Indenture                              61
SECTION 8.03.  Defeasance of Certain Obligations                                  63
SECTION 8.04.  Application of Trust Money                                         64
SECTION 8.05.  Repayment to Company                                               65
SECTION 8.06.  Reinstatement                                                      65
                                                                     
                              ARTICLE NINE                           
                   AMENDMENTS, SUPPLEMENTS AND WAIVERS               
                                                                     
SECTION 9.01.  Without Consent of Holders                                         65
SECTION 9.02.  With Consent of Holders                                            66
SECTION 9.03.  Revocation and Effect of Consent                                   67
SECTION 9.04.  Notation on or Exchange of Notes                                   67
SECTION 9.05.  Trustee to Sign Amendments, Etc                                    67
SECTION 9.06.  Conformity with Trust Indenture Act                                68
                                                                 
                                  ARTICLE TEN
                                    SECURITY
SECTION 10.01.  Security                                                          68
                            

<PAGE>

                                 ARTICLE ELEVEN
                               GUARANTEE OF NOTES
    SECTION 11.01.  Guarantee                                                     69
    SECTION 11.02.  Obligations Unconditional                                     70
    SECTION 11.03.  Notice to Trustee                                             71
    SECTION 11.04.  This Article Not to Prevent Events of Default                 71
    SECTION 11.05.  Net Worth Limitation                                          71



                                 ARTICLE TWELVE
                                  MISCELLANEOUS

    SECTION 12.01.  Trust Indenture Act of 1939                                   71
    SECTION 12.02.  Notices                                                       71
    SECTION 12.03.  Certificate and Opinion as to Conditions Precedent            73
    SECTION 12.04.  Statements Required in Certificate or Opinion                 73
    SECTION 12.05.  Acts of Holders                                               74
    SECTION 12.06.  Rules by Trustee, Paying Agent or Registrar                   74
    SECTION 12.07.  Agent for Service; Submission to Jurisdiction; Waiver of 
                    Immunities                                                    75
    SECTION 12.08.  Payment Date Other Than a Business Day                        75
    SECTION 12.09.  Governing Law                                                 75
    SECTION 12.10.  No Adverse Interpretation of Other Agreements                 75
    SECTION 12.11.  No Recourse Against Others                                    75
    SECTION 12.12.  Successors                                                    76
    SECTION 12.13.  Duplicate Originals                                           76
    SECTION 12.14.  Separability                                                  76
    SECTION 12.15.  Table of Contents, Headings, Etc.                             76



EXHIBIT A          Form A-1Global Note
EXHIBIT B          Form of Definitive Registered Note B-1
EXHIBIT C          Form of Pledge Agreement C-1
</TABLE>
- ----------
Note:    The Table of Contents shall not for any purposes be deemed to be a part
         of the Indenture.


<PAGE>




                  INDENTURE,  dated as of  [____________],  1997,  between ORION
NEWCO SERVICES,  INC., a Delaware  corporation,  as issuer  (together,  with its
successors and assigns,  the  "Company");  ORION NETWORK  SYSTEMS,  INC.,  ORION
SATELLITE CORPORATION, INTERNATIONAL PRIVATE SATELLITE PARTNERS, L.P., ORIONNET,
INC.,  ORION ASIA PACIFIC  CORPORATION,  ASIA PACIFIC SPACE AND  COMMUNICATIONS,
LTD., ORION ATLANTIC  EUROPE,  Ltd., ORION ATLANTIC EUROPE Inc; A. and ORION NET
FINANCE  CORPORATION  Net Finance  Corporation,  all Delaware  Corporations,  as
guarantors;  and BANKERS  TRUST  COMPANY,  a New York  Banking  Corporation,  as
trustee (the "Trustee").

                             RECITALS OF THE COMPANY

                  The Company has duly  authorized the execution and delivery of
this  Indenture  to provide for the  issuance of up to $[ ] aggregate  principal
amount of the  Company's [ ]% Senior  Notes Due 2007 (the  "Notes")  issuable as
provided in this  Indenture.  Pursuant to the terms of a Underwriting  Agreement
dated as of  [____________],  1997 (the  "Underwriting  Agreement")  between the
Company and Morgan Stanley & Co. Incorporated, as the manager for itself and the
several other placement agents therein (the  "Manager"),  the Company has agreed
to issue and sell [ ] units (the "Units"),  each Unit  consisting of $[________]
principal  amount of the Notes  and one  warrant  (the  "Warrant")  to  purchase
initially an equal number of shares of Common  Stock,  par value $.01 per share,
of the Company (the "Common Stock"), issuable pursuant to the terms of a Warrant
Agreement  dated as of [________],  1997 (the "Warrant  Agreement")  between the
Company  and [ ], as the warrant  agent (the  "Warrant  Agent"),  and [ ] Senior
Discount Note Units (the "Senior  Discount  Note Units"),  each Senior Note Unit
consisting  of  $[________]  principal  amount  at  maturity  of the [ ]% Senior
Discount  Notes  Due 2007 (the  "Senior  Discount  Notes")  and one  Warrant  to
purchase initially [ ] shares of Common Stock, issuable pursuant to the terms of
the  Warrant  Agreement.  The Notes will be secured  pursuant  to the terms of a
Pledge  Agreement (as defined  herein) by  Government  Securities as provided by
Article Ten of this  Indenture.  All things  necessary to make this  Indenture a
valid agreement of the Company,  in accordance  with its terms,  have been done,
and the Company has done all things  necessary to make the Notes,  when executed
by the Company and authenticated and delivered by the Trustee hereunder and duly
issued by the  Company,  the valid  obligations  of the  Company as  hereinafter
provided.

                  This  Indenture  is subject to, and shall be governed  by, the
provisions  of the United States Trust  Indenture Act of 1939, as amended,  that
are required to be a part of and to govern indentures qualified under the United
States Trust Indenture Act of 1939, as amended.

                  For and in  consideration  of the premises and the purchase of
the Notes by the Holders thereof,  it is mutually covenanted and agreed, for the
equal and proportionate benefit of all Holders, as follows.
<PAGE>



                                   ARTICLE ONE
                   DEFINITIONS AND INCORPORATION BY REFERENCE

                  SECTION 1.01.  Definitions .

                  "Acquired   Indebtedness"   means  Indebtedness  of  a  Person
existing at the time such Person  becomes a Restricted  Subsidiary or assumed in
connection with an Asset Acquisition by a Restricted Subsidiary and not Incurred
in connection  with, or in  anticipation  of, such Person  becoming a Restricted
Subsidiary or such Asset Acquisition;  provided that Indebtedness of such Person
which is  redeemed,  defeased,  retired  or  otherwise  repaid at the time of or
immediately upon consummation of the transactions by which such Person becomes a
Restricted Subsidiary or such Asset Acquisition shall not be Indebtedness.

                  "Adjusted  Consolidated Net Income" means, for any period, the
aggregate  net income (or loss) of the  Company  and its  Subsidiaries  for such
period  determined in conformity  with GAAP;  provided that the following  items
shall be  excluded  in  computing  Adjusted  Consolidated  Net  Income  (without
duplication):  (i)  the  net  income  of  any  Person  (other  than  net  income
attributable  to a Restricted  Subsidiary)  in which any Person  (other than the
Company or any of its Restricted  Subsidiaries) has a joint interest and the net
income  (or  loss)  of  any  Unrestricted   Subsidiary,   except  that  Adjusted
Consolidated  Net Income for any period shall include the amount of dividends or
other  distributions  actually  paid  to the  Company  or any of its  Restricted
Subsidiaries by such other Person or such  Unrestricted  Subsidiary  during such
period;  (ii) solely for the purposes of  calculating  the amount of  Restricted
Payments  that may be made  pursuant  to clause  (C) of the first  paragraph  of
Section  4.04  of this  Indenture  (and,  in such  case,  except  to the  extent
includable pursuant to clause (i) above), the net income (or loss) of any Person
accrued  prior to the date it becomes a Restricted  Subsidiary or is merged into
or consolidated with the Guarantor or any of its Restricted  Subsidiaries or all
or  substantially  all of the property and assets of such Person are acquired by
the Company or any of its Restricted Subsidiaries; (iii) any gains or losses (on
an after-tax  basis)  attributable  to Asset Sales;  (iv) except for purposes of
calculating  the amount of  Restricted  Payments  that may be made  pursuant  to
clause (C) of the first paragraph of Section 4.04 of this Indenture , any amount
paid or accrued as dividends on Preferred Stock of the Company or any Restricted
Subsidiary  owned by Persons  other than the Company  and any of its  Restricted
Subsidiaries; (v) all extraordinary gains and extraordinary losses; and (vi) any
net income (or loss) of any Guarantor  that ceases to be a Guarantor  because it
is designated an Unrestricted Subsidiary.

                  "Adjusted  Consolidated  Net Tangible  Assets" means the total
amount of assets of the Company and its Restricted Subsidiaries (less applicable
depreciation,  amortization and other valuation reserves),  except to the extent
resulting from write-ups of capital  assets  (excluding  write-ups in connection
with  accounting for  acquisitions  in conformity  with GAAP),  after  deducting
therefrom  (i)  all  current  liabilities  of the  Company  and  its  Restricted
Subsidiaries (excluding intercompany items) and (ii) all goodwill,  trade names,
trademarks,  patents,  unamortized  debt  discount  and  expense  and other like
intangibles,   all  as  set  forth  on  the  most  recent  quarterly  or  annual
consolidated  balance  sheet of the  Company  and its  Restricted  


<PAGE>

Subsidiaries,  prepared in  conformity  with GAAP and filed with the  Commission
pursuant to Section 4.19 of this Indenture.

                  "Affiliate"  means, as applied to any Person, any other Person
directly or indirectly  controlling,  controlled by, or under direct or indirect
common control with,  such Person.  For purposes of this  definition,  "control"
(including,  with correlative meanings, the terms "controlling," "controlled by"
and  "under  common  control  with"),  as  applied  to  any  Person,  means  the
possession,  directly  or  indirectly,  of the  power to  direct  or  cause  the
direction of the  management  and policies of such Person,  whether  through the
ownership of voting securities, by contract or otherwise.

                  "Agent"  means any  Registrar,  Paying  Agent,  authenticating
agent or co-Registrar.

                  "Applicable Procedures" means, with respect to any transfer or
exchange of beneficial  interests,  the rules and  procedures of the  Depositary
that apply to such transfer or exchange.

                  "Asset  Acquisition" means (i) an investment by the Company or
any of its Restricted  Subsidiaries  in any other Person  pursuant to which such
Person  shall  become  a  Restricted  Subsidiary  or  shall  be  merged  into or
consolidated  with the Company or any of its Restricted  Subsidiaries;  provided
that such Person's  primary  business is related,  ancillary or complementary to
the  businesses of the Company and its  Restricted  Subsidiaries  on the date of
such  investment or (ii) an  acquisition by the Company or any of its Restricted
Subsidiaries  of the property and assets of any Person other than the Company or
any  of its  Restricted  Subsidiaries  that  constitute  substantially  all of a
division or line of business of such  Person;  provided  that the  property  and
assets acquired are related, ancillary or complementary to the businesses of the
Company and its Restricted Subsidiaries on the date of such acquisition.

                  "Asset Disposition" means the sale or other disposition by the
Company or any of its  Restricted  Subsidiaries  (other  than to the  Company or
another  Restricted  Subsidiary) of (i) all or substantially  all of the Capital
Stock of any Restricted  Subsidiary of the Company or (ii) all or  substantially
all of the assets that  constitute a division or line of business of the Company
or any of its Restricted Subsidiaries.

                  "Asset  Sale" means any sale,  transfer  or other  disposition
(including by way of merger, consolidation or sale-leaseback transaction) in one
transaction  or a series of related  transactions  by the  Company or any of its
Restricted  Subsidiaries  to any  Person  other  than the  Company or any of its
Restricted Subsidiaries of (i) all or any of the Capital Stock of any Restricted
Subsidiary,  (ii) all or  substantially  all of the  property  and  assets of an
operating unit or business of the Company or any of its Restricted  Subsidiaries
or (iii) any other  property and assets of the Company or any of its  Restricted
Subsidiaries  outside  the  ordinary  course of  business of the Company or such
Restricted  Subsidiary  and, in each case, that is not governed by Section 5.01;
provided that "Asset Sale" shall not include (a) sales or other  dispositions of
inventory,   receivables  and  other  current  assets  or  (b)  sales  or  other
dispositions  of assets for  consideration  received would satisfy clause (B) of
Section 4.11 of this Indenture.
<PAGE>

                  "Average Life" means, at any date  determination  with respect
to any debt  security,  the  quotient  obtained by  dividing  (i) the sum of the
products of (a) the number of years from such date of determination to the dates
of each successive scheduled principal payment of such debt security and (b) the
amount of such principal payment by (ii) the sum of all such principal payments.

                  "Board  of  Directors"  means the  Board of  Directors  of the
Company or any committee of such Board of Directors duly  authorized to act with
respect to this Indenture from time to time.

                  "Board Resolution" means a copy of a resolution,  certified by
any  Director of the Company or the  Secretary  or  Assistant  Secretary  of the
Company to have been duly  adopted by the Board of  Directors  and to be in full
force  and  effect  on the  date of such  certification,  and  delivered  to the
Trustee.

                  "Business  Day" means a day except  Saturday,  Sunday or other
day on which  commercial  banks in the City of New  York,  or in the city of the
Corporate Trust Office of the Trustee, are authorize by law to close.

                  "Capital Stock" means, with respect to any Person, any and all
shares,  interests,  participations  or other equivalents  (however  designated,
whether voting or non-voting) in equity of such Person,  whether now outstanding
or issued after the Closing  Date,  including,  without  limitation,  all Common
Stock and Preferred Stock.

                  "Capitalized Lease" means, as applied to any Person, any lease
of any  property  (whether  real,  personal  or mixed)  of which the  discounted
present value of the rental  obligations of such Person as lessee, in conformity
with GAAP,  is required to be  capitalized  on the balance sheet of such Person;
and "Capitalized  Lease  Obligations"  means the discounted present value of the
rental obligations under such lease.

                  "Certificated  Note" means a certificated  Note  registered in
the name of the Holder  thereof and issued in  accordance  with Section  2.07(a)
hereof, substantially in the form of Exhibit B hereto.

                  "Change  of  Control"  means  such time as (i) a  "person"  or
"group"  (within the meaning of Sections 13(d) and 14(d)(2) of the Exchange Act)
becomes  the  ultimate  "beneficial  owner" (as  defined in Rule 13d-3 under the
Exchange  Act) of more than 35% of the total voting power of the Voting Stock of
the Company on a fully  diluted  basis and such  ownership  is greater  than the
amount of voting power of the Voting Stock of the  Company,  on a fully  diluted
basis, held by the Existing Stockholders and their Affiliates on such date; (ii)
individuals who on the Closing Date constitute the Board of Directors  (together
with  any new  directors  whose  election  by the  Board of  Directors  or whose
nomination for election by the Company's  stockholders was approved by a vote of
at least  two-thirds of the members of the Board of Directors then in office who
either  were  members of the Board of  Directors  on the  Closing  Date or whose
election or nomination  for election was  previously so approved)  cease for any
reason to constitute a majority 


<PAGE>

of the members of the Board of  Directors  then in office;  or (iii) the Company
does  not  beneficially  own 100% of the  equity  interests  in  Orion  Atlantic
Partners, L.P. or such other entity as then owns the Orion 1 satellite.

                  "Chief  Executive  Officer" of the Company means W. Neil Bauer
or, in the event of his death or termination  of his office,  such other Officer
of the Company as the Company may designate.

                  "Closing   Date"  means  the  date  on  which  the  Notes  are
originally issued under the Indenture.

                  "Commission"  means the United States  Securities and Exchange
Commission, as from time to time constituted, created under the Exchange Act or,
if at any time after the  execution of this  instrument  such  Commission is not
existing and  performing  the duties now assigned to it under the TIA,  then the
body performing such duties at such time.

                  "Common  Stock" means,  the shares of Common Stock,  par value
$.01 per share, of the Company.

                  "Company Order" means a written request or order signed in the
name of the  Company  (i) by the  Chairman  of the  Board,  the Chief  Executive
Officer  or an  Executive  Director  and  (ii) by its  Treasurer,  an  Assistant
Treasurer, its Secretary or an Assistant Secretary and delivered to the Trustee;
provided,  however,  that such written request or order may be signed by any two
of the officers or directors  listed in clause (i) above in lieu of being signed
by one of such  officers or  directors  listed in such clause (i) and one of the
officers listed in clause (ii) above.

                  "Consolidated  EBITDA" means,  for any period,  the sum of the
amounts  for  such  period  of  (i)  Adjusted   Consolidated  Net  Income,  (ii)
Consolidated  Interest  Expense,  to the  extent  such  amount was  deducted  in
calculating Adjusted  Consolidated Net Income, (iii) income taxes, to the extent
such amount was deducted in calculating Adjusted  Consolidated Net Income (other
than income taxes (either  positive or negative)  attributable to  extraordinary
and  non-recurring  gains  or  losses  or sales of  assets),  (iv)  depreciation
expense,  to the  extent  such  amount  was  deducted  in  calculating  Adjusted
Consolidated Net Income, (v) amortization expense, to the extent such amount was
deducted in calculating  Adjusted  Consolidated  Net Income,  and (vi) all other
non-cash items reducing Adjusted  Consolidated Net Income (other than items that
will  require  cash  payments  and for which an  accrual  or  reserve  is, or is
required by GAAP to be,  made),  less all  non-cash  items  increasing  Adjusted
Consolidated  Net Income,  all as  determined  on a  consolidated  basis for the
Company and its Restricted Subsidiaries in conformity with GAAP.

                  "Consolidated  Indebtedness"  means  the  aggregate  amount of
Indebtedness  of the Company and its Restricted  Subsidiaries  on a consolidated
basis.
<PAGE>

                  "Consolidated  Interest  Expense" means,  for any period,  the
aggregate  amount of interest  in respect of  Indebtedness  (including,  without
limitation,  amortization of original issue discount on any Indebtedness and the
interest  portion of any deferred payment  obligation,  calculated in accordance
with the effective interest method of accounting; all commissions, discounts and
other fees and  charges  owed with  respect  to  letters of credit and  bankers'
acceptance  financing;  the net costs  associated with Interest Rate Agreements;
and in respect of  Indebtedness  that is Guaranteed or secured by any Restricted
Subsidiaries)  and all but the  principal  component  of  rentals  in respect of
Capitalized  Lease  Obligations  paid,  accrued or scheduled to be paid or to be
accrued by the  Company and its  Restricted  Subsidiaries  during  such  period;
excluding,  however,  any  premiums,  fees and  expenses  (and any  amortization
thereof) payable in connection with the offering of the Notes, all as determined
on a consolidated basis (without taking into account Unrestricted  Subsidiaries)
in conformity with GAAP.

                  "Consolidated  Leverage Ratio" means, on any Transaction Date,
the ratio of (i) the  aggregate  amount of  Indebtedness  of the Company and its
Restricted  Subsidiaries on a consolidated basis outstanding on such Transaction
Date to (ii) the  aggregate  amount  of  Consolidated  EBITDA  for the then most
recent four fiscal quarters for which  financial  statements of the Company have
been filed with the Commission  pursuant to Section 4.19 of this Indenture (such
four fiscal quarter period being the "Four Quarter  Period");  provided that (A)
pro forma effect  shall be given to Asset  Dispositions  and Asset  Acquisitions
(including  giving pro forma effect to the  application of proceeds of any Asset
Disposition)  that occur from the beginning of the Four Quarter  Period  through
the Transaction Date (the "Reference Period"),  as if they had occurred and such
proceeds had been applied on the first day of such Reference Period; and (B) pro
forma  effect  shall  be  given to asset  dispositions  and  asset  acquisitions
(including  giving pro forma effect to the  application of proceeds of any asset
disposition)  that have been made by any  Person  that has  become a  Restricted
Subsidiary  or has  been  merged  with or into  the  Company  or any  Restricted
Subsidiary  during such Reference Period and that would have  constituted  Asset
Dispositions  or Asset  Acquisitions  had such  transactions  occurred when such
Person  was a  Restricted  Subsidiary  as if such  asset  dispositions  or asset
acquisitions were Asset  Dispositions or Asset Acquisitions that occurred on the
first day of such Reference Period;  provided that to the extent that clause (A)
or (B) of this  sentence  requires  that pro  forma  effect be given to an Asset
Acquisition or Asset Disposition, such pro forma calculation shall be based upon
the four full fiscal quarters immediately  preceding the Transaction Date of the
Person,  or division  or line of  business  of the  Person,  that is acquired or
disposed of for which financial information is available.

                  "Consolidated  Net Worth" means, at any date of determination,
stockholders'  equity as set forth on the most recently  available  quarterly or
annual consolidated balance sheet of the Company and its Restricted Subsidiaries
(which  shall be as of a date not  more  than 90 days  prior to the date of such
computation),  less any amounts attributable to Disqualified Stock or any equity
security convertible into or exchangeable for Indebtedness, the cost of treasury
stock and the principal  amount of any promissory notes receivable from the sale
of the Capital Stock of the Company or any of its Restricted Subsidiaries,  each
item to be determined in conformity  with GAAP (excluding the effects of foreign
currency  exchange   adjustments  under  Financial  Accounting  Standards  Board
Statement of Financial Accounting Standards No. 52).
<PAGE>

                  "Corporate  Trust  Office"  means the office of the Trustee at
which the corporate trust business of the Trustee shall, at any particular time,
be  principally  administered,  which office is, at the date of this  Indenture,
located at Bankers Trust Company, 4 Albany Street, New York, N.Y. 10006.

                  "Currency  Agreement"  means any  foreign  exchange  contract,
currency swap agreement or other similar  agreement or  arrangement  designed to
protect  the  Company  or any  Restricted  Subsidiary  against  fluctuations  in
currency values.

                  "Default"  means any event that is, or after notice or passage
of time or both would be, an Event of Default.

                  "Disqualified  Stock"  means any  class or  series of  Capital
Stock  of any  Person  that by its  terms or  otherwise  is (i)  required  to be
redeemed  prior to the Stated  Maturity  of the Notes,  (ii)  redeemable  at the
option of the holder of such class or series of Capital  Stock at any time prior
to the Stated  Maturity of the Notes or (iii)  convertible  into or exchangeable
for Capital Stock referred to in clause (i) or (ii) above or Indebtedness having
a scheduled  maturity prior to the Stated  Maturity of the Notes;  provided that
any  Capital  Stock  that  would  not  constitute  Disqualified  Stock  but  for
provisions  thereof giving  holders  thereof the right to require such Person to
repurchase or redeem such Capital  Stock upon the  occurrence of an "asset sale"
or "change of control" occurring prior to the Stated Maturity of the Notes shall
not  constitute  Disqualified  Stock if the "asset  sale" or "change of control"
provisions applicable to such Capital Stock are no more favorable to the holders
of such Capital Stock than the provisions contained in Sections 4.11 and 4.13 of
this  Indenture  and such Capital Stock  specifically  provides that such Person
will not repurchase or redeem any such stock pursuant to such provision prior to
the  Company's  repurchase  of such  Notes  as are  required  to be  repurchased
pursuant to Sections 4.11 and 4.13 of this Indenture.

                  "Depositary"  shall mean The  Depository  Trust  Company,  its
nominees and their  respective  successors,  until a successor  Depositary shall
have become such pursuant to the applicable  provisions of this  Indenture,  and
thereafter  "Depositary"  shall  been  or  include  each  Person  who is  then a
Despositary hereunder.

                  "Depositary  Interest"  means  a  certificateless   depositary
interest representing a 100% beneficial interest in a Global Note.

                  "Existing Stockholders" means British Aerospace Space Systems,
Inc.,  Lockheed Martin  Commercial  Launch Services,  Inc., MCN Sat. U.S., Inc.,
Trans-Atlantic Satellite,  Inc., Kingston Communications  International Limited,
COM DEV Satellite  Communications  Limited,  J.V.  Saeman & Co., CIBC Wood Gundy
Ventures,  Inc.,  Cumberland  Associates,  Fleet Venture Resources,  Inc., Space
Systems/Loral and any Subsidiary of any of the foregoing.

                  "Event of Default" has the meaning provided in Section 6.01.

                  "Excess Proceeds" has the meaning provided in Section 4.11.
<PAGE>

                  "Exchange Act" means the United States Securities Exchange Act
of 1934, as amended.

                  "fair  market  value" means the price that would be paid in an
arm's-length  transaction  between  an  informed  and  willing  seller  under no
compulsion to sell and an informed and willing buyer under no compulsion to buy,
as determined in good faith by the Board of Directors, whose determination shall
be conclusive if evidenced by a Board Resolution.

                  "GAAP" means generally accepted  accounting  principles in the
United States of America as in effect as of the Closing Date, including, without
limitation, those set forth in the opinions and pronouncements of the Accounting
Principles Board of the American  Institute of Certified Public  Accountants and
statements and pronouncements of the Financial  Accounting Standards Board or in
such other statements by such other entity as approved by a significant  segment
of the accounting profession.  All ratios and computations contained or referred
to in the  Indentures  shall be computed in  conformity  with GAAP  applied on a
consistent  basis,  except that  calculations  made for purposes of  determining
compliance  with the terms of the  covenants  and with other  provisions  of the
Indentures  shall be made without giving effect to (i) the  amortization  of any
expenses  incurred in connection  with the offering of the Notes and (ii) except
as otherwise provided,  the amortization of any amounts required or permitted by
Accounting Principles Board Opinion No. 16 and 17.

                  "Global  Note" means the Global  Notes,  substantially  in the
form of  Exhibit A hereto  issued in  accordance  with  Section  2.01 or 2.07(a)
hereof.

                  "Government   Securities"   means   direct   obligations   of,
obligations fully guaranteed by, or participations in pools consisting solely of
obligations  of or  obligations  guaranteed by, the United States of America for
the payment of which  guarantee or obligations  the full faith and credit of the
United  States of America is pledged and which are not callable or redeemable at
the option of the issuer thereof.

                  "Guarantee" means any obligation,  contingent or otherwise, of
any  Person  directly  or  indirectly  guaranteeing  any  Indebtedness  or other
obligation  of any other  Person and,  without  limiting the  generality  of the
foregoing, any obligation,  direct or indirect, contingent or otherwise, of such
Person (i) to purchase or pay (or  advance or supply  funds for the  purchase or
payment of) such  Indebtedness or other obligation of such other Person (whether
arising by virtue of partnership  arrangements or by agreements to keep-well, to
purchase assets,  goods,  securities or services,  to take-or-pay or to maintain
financial  statement  conditions or otherwise) or (ii) entered into for purposes
of  assuring  in any other  manner  the  obligee of such  Indebtedness  or other
obligation  of the payment  thereof or to protect such  obligee  against loss in
respect thereof (in whole or in part);  provided that the term "Guarantee" shall
not include  endorsements  for  collection or deposit in the ordinary  course of
business. The term Guarantee used as a verb has a corresponding meaning.

                  "Guarantors" means collectively,  Orion Network Systems, Inc.,
Orion Satellite  Corporation,  International  Private Satellite Partners,  L.P.,
OrionNet,  Inc.,  Orion  Asia  Pacific


<PAGE>

Corporation, Asia Pacific Space and Communications, Ltd., Orion Atlantic Europe,
Inc. and OrionNet Finance  Corporation,  and all other Restricted  Subsidiaries;
provided that any Person that becomes an  Unrestricted  Subsidiary in compliance
with  Section  4.04 shall not be  included  in  "Guarantors"  after  becoming an
Unrestricted Subsidiary.

                  "Holder"   means  the  Person  in  whose  name  such  Note  is
registered in the Register.

                  "Incur"  means,  with respect to any  Indebtedness,  to incur,
create, issue, assume,  Guarantee or otherwise become liable for or with respect
to, or become responsible for, the payment of,  contingently or otherwise,  such
Indebtedness,  including an  "Incurrence"  of Indebtedness by reason of a Person
becoming a  Restricted  Subsidiary  of the  Company;  provided  that neither the
accrual of interest  nor the  accretion  of  original  issue  discount  shall be
considered an Incurrence of Indebtedness.

                  "Indebtedness"  means,  with respect to any Person at any date
of determination (without duplication),  (i) all indebtedness of such Person for
borrowed  money,  (ii)  all  obligations  of such  Person  evidenced  by  bonds,
debentures,  notes or other similar  instruments,  (iii) all obligations of such
Person in respect of letters of credit or other similar  instruments  (including
reimbursement  obligations with respect thereto, but excluding  obligations with
respect to  letters  of credit  (including  trade  letters  of credit)  securing
obligations  (other than  obligations  described  in clause (i) or (ii) above or
clause (v), (vi) or (vii) below) entered into in the ordinary course of business
of such  Person to the extent  such  letters of credit are not drawn upon or, if
drawn upon,  to the extent such  drawing is  reimbursed  no later than the third
Business Day  following  receipt by such Person of a demand for  reimbursement),
(iv) all  obligations  of such Person to pay the  deferred  and unpaid  purchase
price of property or services,  which purchase price is due more than six months
after the date of placing such property in service or taking  delivery and title
thereto or the  completion  of such  services,  except Trade  Payables,  (v) all
obligations  of such  Person  as  lessee  under  Capitalized  Leases,  (vi)  all
Indebtedness  of other  Persons  secured by a Lien on any asset of such  Person,
whether or not such  Indebtedness  is assumed by such Person;  provided that the
amount of such Indebtedness  shall be the lesser of (A) the fair market value of
such  asset  at  such  date  of  determination   and  (B)  the  amount  of  such
Indebtedness,  (vii) all Indebtedness of other Persons Guaranteed by such Person
to the extent such  Indebtedness  is Guaranteed by such Person and (viii) to the
extent not otherwise  included in this  definition,  obligations  under Currency
Agreements  and Interest  Rate  Agreements.  The amount of  Indebtedness  of any
Person  at any  date  shall  be the  outstanding  balance  at  such  date of all
unconditional  obligations  as described  above and,  with respect to contingent
obligations, the maximum liability upon the occurrence of the contingency giving
rise to the obligation,  provided (A) that the amount outstanding at any time of
any Indebtedness issued with original issue discount is the original issue price
of such Indebtedness,  (B) Permitted Customer Advances,  Prepayment Supports and
any money borrowed, at the time of the Incurrence of any Indebtedness,  in order
to pre-fund the payment of interest on such Indebtedness, shall be deemed not to
be  "Indebtedness"  and (C)  Indebtedness  shall not include any  liability  for
federal, state, local or other taxes.
<PAGE>

                  "Indenture" means this Indenture as originally  executed or as
it may be amended or  supplemented  from time to time by one or more  indentures
supplemental  to  this  Indenture   entered  into  pursuant  to  the  applicable
provisions of this Indenture.

                  "Independent  Financial  Advisor" means an investment  banking
firm,  accounting firm or other financial  advisory firm of national standing in
the United States,  as the case may be, (i) which,  in the judgment of the Board
of Directors, does not, and whose directors, officers or Affiliates do not, have
a material direct or indirect  financial  interest in the Company (provided that
ownership  of  Capital  Stock of the  Company  constituting  less than 2% of all
outstanding  Capital Stock of the Company shall not constitute a material direct
or indirect financial interest), and (ii) which, in the judgment of the Board of
Directors,  is otherwise independent and qualified to perform the task for which
it is to be engaged.

                  "Indirect  Participant"  means a Person who holds an  interest
through a Participant.

                  "Interest Payment Date" means each semiannual interest payment
date  of  [______________]   and   [_____________]  of  each  year,   commencing
[___________], 1997.

                  "Interest Rate  Agreement"  means any interest rate protection
agreement,  interest  rate future  agreement,  interest  rate option  agreement,
interest rate swap agreement,  interest rate cap agreement, interest rate collar
agreement,   interest  rate  hedge  agreement  or  other  similar  agreement  or
arrangement   designed  to  protect  the  Company  or  any  of  its   Restricted
Subsidiaries  against  fluctuations in interest rates in respect of Indebtedness
to or under which the Company or any of its Restricted  Subsidiaries  is a party
or a  beneficiary  on the  date of  this  Indenture  or  becomes  a  party  or a
beneficiary hereafter;  provided that the notional principal amount thereof does
not exceed the  principal  amount of the  Indebtedness  of the  Company  and its
Restricted Subsidiaries that bears interest at floating rates.

                  "Investment"  in any  Person  means  any  direct  or  indirect
advance,  loan or other extension of credit (including,  without limitation,  by
way of Guarantee or similar arrangement;  but excluding advances to customers in
the ordinary course of business that are, in conformity  with GAAP,  recorded as
accounts  receivable  on the  balance  sheet of the  Company  or its  Restricted
Subsidiaries)  or capital  contribution  to (by means of any transfer of cash or
other property to others or any payment for property or services for the account
or use of others),  or any  purchase or  acquisition  of Capital  Stock,  bonds,
notes,  debentures or other similar instruments issued by, such Person and shall
include  (i) the  designation  of a  Restricted  Subsidiary  as an  Unrestricted
Subsidiary  and (ii) the fair market  value of the  Capital  Stock (or any other
Investment),  held by the Company or any of its Restricted Subsidiaries,  of (or
in) any Person that has ceased to be a Restricted Subsidiary, including, without
limitation,  by reason of any  transaction  permitted by clause (iii) of Section
4.06  of  this  Indenture.  For  purposes  of the  definition  of  "Unrestricted
Subsidiary" and Section 4.04 of this Indenture,  (i) "Investment"  shall include
the fair market value of the assets (net of liabilities  (other than liabilities
to the Company or any of its Subsidiaries)) of any Restricted  Subsidiary at the
time that such Restricted  Subsidiary is designated an Unrestricted  Subsidiary,
(ii) the fair  market  value  of the  assets  (net of  liabilities  (other  than
liabilities  to the  Company or any of its  Subsidiaries))  of any  Unrestricted
<PAGE>

Subsidiary  at the time  that  such  Unrestricted  Subsidiary  is  designated  a
Restricted Subsidiary shall be considered a reduction in outstanding Investments
and (iii) any property  transferred to or from an Unrestricted  Subsidiary shall
be valued at its fair market value at the time of such transfer.

                  "Issue Date" means the original date of issuance of the Notes.

                  "Junior Subordinated  Convertible  Debentures" means the 8.75%
Convertible Junior Subordinated Debentures Due 2012 of the Company.

                  "Kingston"   means   Kingston   Communications   International
Limited.

                  "Lien"  means  any  mortgage,   pledge,   security   interest,
encumbrance,  lien or charge of any kind  (including,  without  limitation,  any
conditional  sale or other  title  retention  agreement  or lease in the  nature
thereof or any agreement to give any security interest).

                  "Manager" means Morgan Stanley & Co. Incorporated,  as manager
for itself and the several other  underwriters  agents named in the Underwriting
Agreement.

                  "Matra"  means  Matra  Marconi  Space UK  Limited,  the parent
Company of MMS Space Systems and a subsidiary  of Matra Marconi Space N.V.,  and
the manufacturer under the Orion 2 Satellite Contract.

                  "Maturity Date" means the Stated Maturity of the Notes.

                  "Merger" means the merger pursuant to an Agreement and Plan of
Merger dated January 8, 1997, of Old ONSI with a Wholly Owned  subsidiary of the
Company.

                  "Moody's"  means  Moody's  Investors  Service,  Inc.  and  its
successors.

                  "Net Cash Proceeds" means, (a) with respect to any Asset Sale,
the  proceeds  of  such  Asset  Sale in the  form  of cash or cash  equivalents,
including  payments in respect of deferred  payment  obligations  (to the extent
corresponding  to the  principal,  but not  interest,  component  thereof)  when
received  in the form of cash or cash  equivalents  (except to the  extent  such
obligations  are financed or sold with recourse to the Company or any Restricted
Subsidiary)  and proceeds from the  conversion of other  property  received when
converted to cash or cash  equivalents  (including cash or cash equivalents that
are deposited in escrow  pending  satisfaction  of  conditions  specified in the
relevant sale documents or that secures Prepayment  Supports,  in each case when
such cash or cash  equivalents  are  released  to the  Company  or a  Restricted
Subsidiary),  net of (i)  brokerage  commissions  and  other  fees and  expenses
(including fees and expenses of counsel and investment  bankers) related to such
Asset  Sale,  (ii)  provisions  for all taxes  (whether  or not such  taxes will
actually be paid or are payable) as a result of such Asset Sale  without  regard
to the  consolidated  results of  operations  of the Company and its  Restricted
Subsidiaries, taken as a whole, (iii) payments made to repay Indebtedness or any
other  obligation  outstanding at the time of such Asset Sale that either (A) is
secured by a Lien on the  property  or assets sold or (B) is required to be paid
as a result of such sale and (iv)  appropriate  amounts 



<PAGE>

to be provided by the Company or any  Restricted  Subsidiary of the Company as a
reserve  against any  liabilities  associated  with such Asset Sale,  including,
without  limitation,  pension  and other  post-employment  benefit  liabilities,
liabilities   related  to  environmental   matters  and  liabilities  under  any
indemnification  obligations  associated with such Asset Sale, all as determined
in conformity  with GAAP and (b) with respect to any issuance or sale of Capital
Stock,  the  proceeds  of such  issuance  or  sale  in the  form of cash or cash
equivalents,  including payments in respect of deferred payment  obligations (to
the extent corresponding to the principal, but not interest,  component thereof)
when received in the form of cash or cash equivalents (except to the extent such
obligations  are financed or sold with recourse to the Company or any Restricted
Subsidiary  of the Company) and proceeds from the  conversion of other  property
received when  converted to cash or cash  equivalents,  net of attorney's  fees,
accountants'  fees,  underwriters'  or  placement  agents'  fees,  discounts  or
commissions and brokerage, consultant and other fees incurred in connection with
such issuance or sale and net of taxes paid or payable as a result thereof.

                  "Note  Guarantee" means the Guarantee by the Guarantors of the
Company's  obligations  under  the  Notes  and the  Indenture,  pursuant  to the
Indenture, and the Guarantee by any other Person that becomes a Guarantor of the
Company's obligations under the Notes and the Indenture.

                  "Notes" means the [___________]%  Senior Notes due 2007 of the
Company issued pursuant to this Indenture.

                  "Offer to  Purchase"  means an offer to purchase  Notes by the
Company  from the Holders  commenced by mailing a notice to the Trustee and each
Holder stating:  (i) the covenant  pursuant to which the offer is being made and
that all Notes  validly  tendered  will be  accepted  for  payment on a pro rata
basis;  (ii) the  purchase  price  and the date of  purchase  (which  shall be a
Business  Day no earlier  than 30 days nor later than 60 days from the date such
notice is mailed) (the  "Payment  Date");  (iii) that any Note not tendered will
continue to accrue interest pursuant to its terms; (iv) that, unless the Company
defaults in the payment of the  purchase  price,  any Note  accepted for payment
pursuant  to the Offer to Purchase  shall cease to accrue  interest on and after
the Payment Date; (v) that Holders electing to have a Note purchased pursuant to
the Offer to Purchase will be required to surrender the Note,  together with the
form  entitled  "Option of the Holder to Elect  Purchase" on the reverse side of
the Note completed,  to the Paying Agent at the address  specified in the notice
prior to the close of business on the Business  Day  immediately  preceding  the
Payment Date;  (vi) that Holders will be entitled to withdraw  their election if
the Paying  Agent  receives,  not later than the close of  business on the third
Business Day  immediately  preceding  the Payment  Date,  a telegram,  facsimile
transmission  or letter  setting  forth the name of such Holder,  the  principal
amount at maturity of Notes  delivered  for purchase  and a statement  that such
Holder is withdrawing his election to have such Notes purchased;  and (vii) that
Holders  whose Notes are being  purchased  only in part will be issued new Notes
equal in principal  amount at maturity to the  unpurchased  portion of the Notes
surrendered; provided that each Note purchased and each new Note issued shall be
in a principal amount at maturity of $1,000 or integral  multiples  thereof.  On
the Payment  Date,  the Company shall (i) accept for payment on a pro rata basis
Notes or  portions  thereof  tendered  pursuant  to 


<PAGE>

an Offer to Purchase; (ii) deposit with the Paying Agent money sufficient to pay
the  purchase  price of all Notes or  portions  thereof so  accepted;  and (iii)
deliver, or cause to be delivered,  to the Trustee all Notes or portions thereof
so accepted  together  with an  Officers'  Certificate  specifying  the Notes or
portions  thereof  accepted for payment by the  Company.  The Paying Agent shall
promptly mail to the Holders of Notes so accepted  payment in an amount equal to
the purchase price, and the Trustee shall promptly authenticate and mail to such
Holders a new Note equal in  principal  amount at  maturity  to any  unpurchased
portion of the Note surrendered;  provided that each Note purchased and each new
Note  issued  shall be in a  principal  amount at maturity of $1,000 or integral
multiples thereof. The Company will publicly announce the results of an Offer to
Purchase as soon as practicable after the Payment Date. The Trustee shall act as
the Paying  Agent for an Offer to  Purchase.  The Company  will comply with Rule
14e-1  under the  Exchange  Act and any other  securities  laws and  regulations
thereunder to the extent such laws and regulations are applicable,  in the event
that the  Company  is  required  to  repurchase  Notes  pursuant  to an Offer to
Purchase.

                  "Old  ONSI"  means the  Delaware  corporation  known as "Orion
Network Systems, Inc." prior to the consummation of the Merger.

                  "Orion  Atlantic"  means   International   Private   Satellite
Partners, L.P., a Delaware Limited Partnership.

                  "Orion  1"  means  the   high-power   Ku-band   communications
satellite operated over the Atlantic Ocean by Orion.

                  "Orion 2" and "Orion 3" mean, respectively,  each of the first
two satellites  with respect to which the Company has a Successful  Launch after
the Closing Date, and any replacement for either of such satellites.

                  "Orion 1 Satellite  Contract"  means the fixed  price  turnkey
contract  originally  entered into between British  Aerospace and Orion Atlantic
for the design, construction, launch and delivery in orbit of Orion 1.

                  "Orion 2 Satellite  Contract"  means the  spacecraft  purchase
agreement  between Orion and Matra Marconi Space for  construction and launch of
Orion 2.

                  "Officer" means, with respect to the Company, (i) the Chairman
of the Board,  the Chief Executive  Officer or any other Director of the Company
or (ii) the Treasurer or any Assistant  Treasurer,  the Company Secretary or any
Company Assistant Secretary.

                  "Officers'  Certificate"  means a  certificate  signed  by one
Officer listed in clause (i) of the definition thereof and one Officer listed in
clause  (ii)  of the  definition  thereof;  provided,  however,  that  any  such
certificate may be signed by any two of the Officers listed in clause (i) of the
definition  thereof in lieu of being signed by one Officer  listed in clause (i)
of the  definition  thereof  and  one  Officer  listed  in  clause  (ii)  of the
definition thereof. Each


<PAGE>

Officers'  Certificate (other than certificates provided pursuant to TIA Section
314(a)(4)) shall include the statements  provided for in TIA Section 314(e),  if
applicable.

                  "Opinion of Counsel"  means a written  opinion signed by legal
counsel who may be an employee of or counsel to the  Company.  Each such Opinion
of Counsel shall include the statements  provided for in TIA Section 314(e),  if
applicable.

                  "Participant"  means,  with  respect  to a the  Depositary,  a
Person who has an account therewith.

                  "Paying  Agent" has the  meaning  provided  in  Section  2.03,
except that,  for the purposes of Article  Eight,  the Paying Agent shall not be
the Company or a Subsidiary  of the Company or an Affiliate of any of them.  The
term "Paying Agent" includes any additional Paying Agent.

                  "Payment  Date" means with  respect to any Offer to  Purchase,
the date of purchase of the Notes  pursuant  thereto,  which shall be a Business
Day no  earlier  than 30 days nor  later  than 60 days from the date a notice is
mailed pursuant to such Offer to Purchase.

                  "Permitted Customer Advances" means obligations of the Company
or any  Restricted  Subsidiary  to repay  money  received by the Company or such
Restricted  Subsidiary from customers as bona fide prepayment for services to be
provided  by, or  purchases  to be made from,  the  Company  or such  Restricted
Subsidiary.

                  "Permitted  Investment" means (i) an Investment in the Company
or a  Restricted  Subsidiary  or a Person  which  will,  upon the making of such
Investment,  become a Restricted Subsidiary or be merged or consolidated with or
into or transfer or convey all or  substantially  all its assets to, the Company
or a Restricted  Subsidiary;  provided  that such person's  primary  business is
related,  ancillary or  complementary  to the  businesses of the Company and its
Restricted  Subsidiaries  on the date of such  Investment;  (ii)  Temporary Cash
Investments;  (iii) payroll,  travel and similar  advances to cover matters that
are expected at the time of such  advances  ultimately to be treated as expenses
in accordance with GAAP; and (iv) stock,  obligations or securities  received in
satisfaction of judgments.

                  "Permitted  Liens"  means (i) Liens  for  taxes,  assessments,
governmental  charges  or  claims  that are  being  contested  in good  faith by
appropriate legal proceedings  promptly instituted and diligently  conducted and
for which a reserve or other appropriate provision, if any, as shall be required
in  conformity  with GAAP shall have been made;  (ii)  statutory  and common law
Liens  of  landlords   and   carriers,   warehousemen,   mechanics,   suppliers,
materialmen,  repairmen or other similar Liens arising in the ordinary course of
business and with respect to amounts not yet  delinquent  or being  contested in
good faith by appropriate legal proceedings  promptly  instituted and diligently
conducted  and for which a reserve or other  appropriate  provision,  if any, as
shall be  required  in  conformity  with GAAP shall have been made;  (iii) Liens
incurred or deposits made in the ordinary  course of business in connection with
workers'  compensation,   unemployment  insurance  and  other  types  of  social
security;  (iv) Liens  incurred 


<PAGE>

or deposits made to secure the performance of tenders,  bids, leases,  statutory
or  regulatory  obligations,  bankers'  acceptances,  surety and  appeal  bonds,
government   contracts,   performance  and   return-of-money   bonds  and  other
obligations  of a similar  nature  incurred in the  ordinary  course of business
(exclusive of  obligations  for the payment of borrowed  money);  (v) easements,
rights-of-way,   municipal   and  zoning   ordinances   and   similar   charges,
encumbrances,  title  defects  or other  irregularities  that do not  materially
interfere  with the  ordinary  course of  business  of the Company or any of its
Restricted Subsidiaries;  (vi) Liens (including extensions and renewals thereof)
upon real or personal  property  acquired after the Closing Date;  provided that
(a) such  Lien is  created  solely  for the  purpose  of  securing  Indebtedness
Incurred, in accordance with Section 4.03 of this Indenture,  (1) to finance the
cost (including the cost of improvement, transportation, development and design,
installation,  integration  or  construction)  of the item of property or assets
subject  thereto and such Lien is created prior to, at the time of or within six
months after the later of the acquisition, the completion of construction or the
commencement  of  full  operation  of  such  property  or (2) to  refinance  any
Indebtedness previously so secured, (b) the principal amount of the Indebtedness
secured by such Lien does not exceed 100% of such cost (plus, in the case of any
refinancing  Indebtedness  referred  to in clause  (vi)(a)(2)  above,  premiums,
accrued  interest,  fees and  expenses),  (c) any Lien  permitted by this clause
shall not  extend to or cover any  property  or assets  other  than such item of
property or assets and any  improvements on such item and (d) such Liens may not
relate to Orion 2 or Orion 3; (vii) leases or  subleases  granted to others that
do not materially  interfere with the ordinary course of business of the Company
and its  Restricted  Subsidiaries,  taken as a whole;  (viii) Liens  encumbering
property or assets under construction  arising from progress or partial payments
by a customer of the  Company or its  Restricted  Subsidiaries  relating to such
property  or  assets;  (ix) any  interest  or title of a lessor in the  property
subject to any  Capitalized  Lease or operating  lease;  (x) Liens  arising from
filing Uniform Commercial Code financing statements regarding leases; (xi) Liens
on property  of, or on shares of Capital  Stock or  Indebtedness  of, any Person
existing at the time such Person  becomes,  or becomes a part of, any Restricted
Subsidiary;  provided  that such Liens do not extend to or cover any property or
assets of the Company or any  Restricted  Subsidiary  other than the property or
assets  acquired;  (xii)  Liens  in  favor  of the  Company  or  any  Restricted
Subsidiary; (xiii) Liens arising from the rendering of a final judgment or order
against the Company or any  Restricted  Subsidiary  of the Company that does not
give rise to an Event of Default; (xiv) Liens securing reimbursement obligations
with respect to letters of credit that  encumber  documents  and other  property
relating to such letters of credit and the products and proceeds  thereof;  (xv)
Liens in favor of customs and revenue  authorities arising as a matter of law to
secure  payment of customs duties in connection  with the  importation of goods;
(xvi) Liens  encumbering  customary  initial deposits and margin  deposits,  and
other Liens that are within the general parameters customary in the industry and
incurred in the ordinary course of business, in each case, securing Indebtedness
under Interest Rate  Agreements and Currency  Agreements and forward  contracts,
options, future contracts, futures options or similar agreements or arrangements
designed  solely to protect  the Company or any of its  Restricted  Subsidiaries
from  fluctuations  in interest  rates,  currencies or the price of commodities;
(xvii) Liens arising out of conditional  sale, title  retention,  consignment or
similar arrangements for the sale of goods entered into by the Company or any of
its  Restricted  Subsidiaries  in the ordinary  course of business in accordance
with the past practices of the Company and its Restricted  Subsidiaries prior to
the  Closing  Date;  (xviii)  Liens  on or  sales of  receivables;  (xix)  


<PAGE>

Liens  (including  Liens  securing  Prepayment  Supports) on amounts of money or
Temporary Cash Investments that each represent bona fide prepayments of at least
$5 million on  agreements  for the  long-term  sale or lease of  capacity on any
satellite  owned by the  Company  or a  Restricted  Subsidiary,  but only to the
extent that the amount of money or  Temporary  Cash  Investments  subject to any
such Lien does not exceed the amount of such prepayment and reasonable  interest
thereon;  (xx) Liens encumbering contracts between the Company or any Restricted
Subsidiary and any third party  customer  relating to the use of a VSAT owned by
the  Company  or any  Restricted  Subsidiary  but only if,  and so long as,  the
Indebtedness  secured by any such Lien is also secured by a Lien permitted under
clause (vi) of this  definition  encumbering  such VSAT;  and (xxi) Liens upon a
satellite and  components  thereof  during the period in which such satellite is
being constructed,  provided that (a) such Liens (1) are for the benefit of only
the  manufacturer  of such  satellite  or  components  and (2)  secure  only the
obligation of the Company or any Restricted Subsidiary to pay the purchase price
for such satellite or components and (b) such Liens are actually  released upon,
or prior to, the completion of  construction  of such satellite and prior to the
launch or commencement of full operations of such satellite.

                  "Person" means any individual, corporation, partnership, joint
venture,  trust,  unincorporated  organization  or  government  or any agency or
political subdivision thereof.

                  "Pledge Account" means an account established with the Trustee
pursuant  to the terms of the Pledge  Agreement  for the  deposit of the Pledged
Securities purchased by the Company with a portion of the proceeds from the sale
of the Senior Notes.

                  "Pledge  Agreement"  means the Collateral  Pledge and Security
Agreement,  dated as of the date of this Indenture, made by the Company in favor
of the Trustee,  governing the disbursement of funds from the Pledge Account, as
such Agreement may be amended, restated, supplemented or otherwise modified from
time to time.

                  "Pledged Securities" means the securities originally purchased
by the Company with a portion of the proceeds from the sale of the Senior Notes,
which shall  consist of  Government  Securities,  to be  deposited in the Pledge
Account, all in accordance with the terms of the Pledge Agreement.

                  "Prepayment  Support" means the  reimbursement  obligations of
the Company or any  Restricted  Subsidiary in connection  with any fully secured
letter  of credit  or  similar  credit  support  issued  by any  third  party in
connection with the obligations of the Company or such Restricted  Subsidiary to
repay  amounts  received  as bona fide  prepayments  of at least $5  million  on
agreements for the long-term  sale or lease of capacity on a satellite  owned by
the Company or a Restricted Subsidiary.

                  "Redemption  Date,"  when used with  respect to any Note to be
redeemed,  means  the date  fixed for such  redemption  by or  pursuant  to this
Indenture.

                  "Redemption  Indebtedness"  means  Indebtedness of the Company
which  is  (i)   subordinated  in  right  of  payment  of  the  Notes  on  terms
substantially similar to the terms

<PAGE>

contained,  on  the  Closing  Date,  in  Article  14 of the  Debenture  Purchase
Agreement  (but excluding the terms  contained,  on the Closing Date, in Section
14.7 of the Debenture Purchase Agreement) and (ii) Incurred for the sole purpose
of financing the  redemption,  repurchase or  acquisition  of shares of Series A
Preferred Stock or Series B Preferred Stock.

                  "Redemption  Price,"  when used with respect to any Note to be
redeemed,  means the price at which such Note is to be redeemed pursuant to this
Indenture.

                  "Register" has the meaning provided in Section 2.03.

                  "Registrar" has the meaning provided in Section 2.03.

                  "Regular Record Date" for the interest payable on any Interest
Payment Date means the [_______] or [_______]  (whether or not a Business  Day),
as the case may be, next preceding such Interest Payment Date.

                  "Related  Person"  means any holder (or any  Affiliate of such
holder)  of 5% or more of any  class of  Capital  Stock of the  Company  and any
Affiliate of the Company or any Restricted Subsidiary.

                  "Released Indebtedness" means, with respect to any Asset Sale,
Indebtedness (i) which is owed by the Company or any Restricted  Subsidiary (the
"Obligors")  prior to such Asset Sale, (ii) which is assumed by the purchaser or
any affiliate  thereof in connection with such Asset Sale and (iii) with respect
to the Obligors receive written,  unconditional  releases from each creditor, no
later than the closing date of such Asset Sale.

                  "Responsible  Officer," when used with respect to the Trustee,
means the chairman or any vice chairman of the board of directors,  the chairman
or any vice chairman of the executive  committee of the board of directors,  the
chairman  of the  trust  committee,  the  president,  any  vice  president,  any
assistant vice president, the secretary, any assistant secretary, the treasurer,
any assistant  treasurer,  the cashier, any assistant cashier, any trust officer
or assistant  trust officer,  the controller or any assistant  controller or any
other officer of the Trustee customarily  performing  functions similar to those
performed by any of the above designated  officers and also means,  with respect
to a particular corporate trust matter, any other officer to whom such matter is
referred  because of his or her knowledge of and familiarity with the particular
subject.

                  "Restricted  Payments"  has the  meaning  provided  in Section
4.04.

                  "Restricted  Subsidiary"  means any  Subsidiary of the Company
other than an Unrestricted Subsidiary.

                  "S&P"  means   Standard  &  Poor's   Ratings   Group  and  its
successors.

                  "Securities  Act" means the United  States  Securities  Act of
1933, as amended.
<PAGE>

                  "Separation  Date" means the  earliest of (i) six months after
the  date  of  issuance,  (ii)  such  date as the  Underwriters  may,  in  their
discretion,  deem appropriate and (ii) in the event of an Offer to Purchase, the
date the Company mails notice thereof to holders of the Notes.

                  "Series A Preferred  Stock"  means the  Company's  Series A 8%
Cumulative Redeemable Convertible Preferred Stock, par value $0.01 per share.

                  "Series B Preferred  Stock"  means the  Company's  Series B 8%
Cumulative Redeemable Convertible Preferred Stock, par value $0.01 per share.

                  "Significant  Subsidiary" means, at any date of determination,
any Restricted Subsidiary that, together with its Subsidiaries, (i) for the most
recent  fiscal  year  of  the  Company,  accounted  for  more  than  10%  of the
consolidated revenues of the Company and its Restricted  Subsidiaries or (ii) as
of the  end of  such  fiscal  year,  was  the  owner  of  more  than  10% of the
consolidated assets of the Company and its Restricted  Subsidiaries,  all as set
forth on the most recently available  consolidated  financial  statements of the
Company for such fiscal year.

                  "Specified  Date" means any Redemption  Date, any Payment Date
for an Offer to Purchase pursuant to Section 4.11 or Section 4.13 or any date on
which the Securities are due and payable after an Event of Default.

                  "Stated   Maturity"  means,  (i)  with  respect  to  any  debt
security,  the date  specified in such debt  security as the fixed date on which
the final  installment of principal of such debt security is due and payable and
(ii) with respect to any  scheduled  installment  of principal of or interest on
any debt security, the date specified in such debt security as the fixed date on
which such installment is due and payable.

                  "Subsidiary"   means,   with   respect  to  any  Person,   any
corporation,  association or other business entity of which more than 50% of the
voting power of the outstanding  Voting Stock is owned,  directly or indirectly,
by such Person and one or more other Subsidiaries of such Person.

                  "Subsidiary Guarantee" means the Guarantee of the Notes by any
Subsidiary of the Company substantially in the form of Exhibit F hereto.

                  "Successful Launch" means, with respect to any satellite,  the
placing into orbit of such  satellite in its assigned  orbital  position with at
least 40% of the transponder capacity fully operational.

                  "Tax" means any tax, duty, levy,  impost,  assessment or other
governmental  charge  (including  penalties,  interest and any other liabilities
related thereto).

                  "Taxing   Authority"   means  any   government   or  political
subdivision  or territory or  possession  of any  government or any authority or
agency therein or thereof having power to tax.
<PAGE>

                  "Temporary Cash  Investment"  means any of the following:  (i)
direct  obligations  of the United  States of  America or any agency  thereof or
obligations fully and unconditionally guaranteed by the United States of America
or any agency thereof,  (ii) time deposit accounts,  certificates of deposit and
money  market  deposits  maturing  within  180 days of the  date of  acquisition
thereof  issued by a bank or trust company which is organized  under the laws of
the  United  States  of  America,  any  state  thereof  or any  foreign  country
recognized  by the United  States,  and which bank or trust company has capital,
surplus  and  undivided  profits  aggregating  in excess of $50  million (or the
foreign currency equivalent thereof) and has outstanding debt which is rated "A"
(or such  similar  equivalent  rating)  or  higher  by at least  one  nationally
recognized  statistical  rating  organization  (as defined in Rule 436 under the
Securities Act) or any money-market fund sponsored by a registered broker dealer
or mutual fund distributor, (iii) repurchase obligations with a term of not more
than 30 days for  underlying  securities  of the types  described  in clause (i)
above  entered into with a bank meeting the  qualifications  described in clause
(ii) above, (iv) commercial paper, maturing not more than 90 days after the date
of acquisition, issued by a corporation (other than an Affiliate of the Company)
organized and in existence  under the laws of the United States of America,  any
state thereof or any foreign country  recognized by the United States of America
with a rating at the time as of which any  investment  therein  is made of "P-1"
(or higher)  according to Moody's or "A-1" (or higher) according to S&P, and (v)
securities  with  maturities of six months or less from the date of  acquisition
issued or fully and  unconditionally  guaranteed by any state,  commonwealth  or
territory of the United States of America,  or by any political  subdivision  or
taxing authority thereof, and rated at least "A" by S&P or Moody's.

                  "TIA" or "Trust  Indenture  Act" means the United States Trust
Indenture  Act of 1939,  as amended  (15 U.S.  Code ss.ss.  77aaa-77bbb),  as in
effect on the date this  Indenture was  executed,  except as provided in Section
9.06.

                  "Trade  Payables"  means,  with  respect  to any  Person,  any
accounts  payable or any other  indebtedness  or  monetary  obligation  to trade
creditors  created,  assumed  or  Guaranteed  by  such  Person  or  any  of  its
Subsidiaries  arising in the ordinary  course of business in connection with the
acquisition of goods or services.

                  "Transaction  Date" means,  with respect to the  Incurrence of
any Indebtedness by the Company or any of its Restricted Subsidiaries,  the date
such Indebtedness is to be Incurred and, with respect to any Restricted Payment,
the date such Restricted Payment is to be made.

                  "TT&C Financing" means the agreement, dated November 23, 1993,
between  General  Electric  Capital  Corporation  and  International   Satellite
Partners, L.P. ("Orion Atlantic"), relating to borrowings by Orion Atlantic.

                  "Trustee" means the party named as such in the first paragraph
of  this  Indenture  until  a  successor  replaces  it in  accordance  with  the
provisions  of  Article  Seven  of this  Indenture  and  thereafter  means  such
successor.

                  "Underwriters"   has  the   meaning   as  set   forth  in  the
Underwriting Agreement.
<PAGE>

                  "Underwriting Agreement" means the Underwriting Agreement date
[ ] 1997  between  the  Company  and the  Manager,  for  itself  and  the  other
Underwriters named therein.

                  "Units"  has the  meaning  provided  in the  recitals  to this
Indenture.

                  "Unrestricted  Subsidiary"  means  (i) any  Subsidiary  of the
Company that at the time of  determination  shall be designated an  Unrestricted
Subsidiary by the Board of Directors in the manner  provided  below and (ii) any
Subsidiary of an Unrestricted  Subsidiary.  The Board of Directors may designate
any  Restricted  Subsidiary  (including  any  newly  acquired  or  newly  formed
Subsidiary  of  the  Company)  to  be an  Unrestricted  Subsidiary  unless  such
Subsidiary  owns any Capital Stock of, or owns or holds any Lien on any property
of, the Company or any Restricted Subsidiary; provided that (A) any Guarantee by
the Company or any Restricted  Subsidiary of any  Indebtedness of the Subsidiary
being so designated shall be deemed an "Incurrence" of such  Indebtedness and an
"Investment"  by  the  Company  or  such  Restricted  Subsidiary  (or  both,  if
applicable) at the time of such designation; (B) either (I) the Subsidiary to be
so designated has total assets of $1,000 or less or (II) if such  Subsidiary has
assets  greater  than $1,000,  such  designation  would be  permitted  under the
Section  4.04 of  this  Indenture,  and (C) if  applicable,  the  Incurrence  of
Indebtedness and the Investment  referred to in clause (A) of this proviso would
be  permitted  under the Section 4.03 and Section  4.04 of this  Indenture.  The
Board of Directors may designate any Unrestricted  Subsidiary to be a Restricted
Subsidiary;  provided that  immediately  after giving effect to such designation
(x) the Company  could Incur $1.00 of  additional  Indebtedness  under the first
paragraph  of  Section  4.03 of this  Indenture  and (y) no  Default or Event of
Default shall have occurred and be continuing. Any such designation by the Board
of  Directors  shall be  evidenced  to the Trustee by  promptly  filing with the
Trustee a copy of the Board Resolution  giving effect to such designation and an
Officers'  Certificate  certifying  that  such  designation  complied  with  the
foregoing provisions.

                  "Voting  Stock"  means,  with  respect to any Person,  Capital
Stock of any class or kind ordinarily  having the power to vote for the election
of directors,  managers or other voting  members of the  governing  body of such
Person.

                  "Warrants"  means the warrants to purchase Common Stock of the
Company issued as part of a unit with each of the Notes and the Senior  Discount
Notes.

                  "Wholly  Owned" means,  with respect to any  Subsidiary of any
Person, the ownership of all of the outstanding Capital Stock of such Subsidiary
(other than any director's qualifying shares or Investments by foreign nationals
mandated  by  applicable  law)  by  such  Person  or one or  more  Wholly  Owned
Subsidiaries of such Person.

                  SECTION 1.02.  Incorporation  by Reference of Trust  Indenture
Act . Whenever this  Indenture  refers to a provision of the TIA, such provision
is incorporated by reference in and made a part of this Indenture. The following
TIA terms used in this Indenture have the following meanings:

                  "indenture securities" means the Notes;
<PAGE>

                  "indenture security holder" means a Holder;

                  "indenture to be qualified" means this Indenture;

                  "indenture  trustee"  or  "institutional  trustee"  means  the
Trustee; and

                  "obligor" on the indenture securities means the Company or any
other obligor on the Notes.

                  All other TIA terms used in this Indenture that are defined by
the TIA, defined by TIA reference to another statute or defined by a rule of the
Commission and not otherwise  defined herein have the meanings  assigned to them
therein.

                  SECTION  1.03.  Rules of  Construction  . Unless  the  context
otherwise requires:

                  (i)      a term has the meaning assigned to it;

                  (ii) an accounting term not otherwise  defined has the meaning
         assigned to it in accordance with GAAP;

                  (iii)    "or" is not exclusive;

                  (iv) words in the  singular  include the plural,  and words in
         the plural include the singular;

                  (v) provisions apply to successive events and transactions;

                  (vi)  "herein,"  "hereof"  and other  words of similar  import
         refer to this Indenture as a whole and not to any  particular  Article,
         Section or other subdivision;

                  (vii) all  references to Sections,  Articles or Exhibits refer
         to Sections,  Articles or Exhibits of this Indenture  unless  otherwise
         indicated; and

                  (viii) references to sections of or rules under the Securities
         Act shall be deemed to include  substitute,  replacement  or  successor
         sections of the Securities Act or rules adopted by the Commission  from
         time to time.


                                   ARTICLE TWO
                                    THE NOTES

                  SECTION 2.01.  Form and Dating . (a) Global  Notes.  The Notes
offered  and sold  shall be issued in the form of one or more  fully  registered
Notes in global form ("Global Notes"), which shall be deposited on behalf of the
purchasers of the Notes  represented  thereby with the at its New York corporate
trust office,  duly executed by the Company and  authenticated


<PAGE>

by  the  Trustee  as  hereinafter   provided.   The  Notes  in  definitive  form
("Certificated  Notes")  shall  not be  issued  except as  provided  in  Section
2.07(a).  The  aggregate  principal  amount of each of the Global Notes may from
time to time be increased or decreased by adjustments made on the records of the
Trustee as hereinafter provided.

                  Each Global Note shall represent such of the outstanding Notes
as shall be specified therein and each shall provide that it shall represent the
aggregate  principal  amount of  outstanding  Notes  from time to time  endorsed
thereon and that the aggregate principal amount of outstanding Notes represented
thereby  may from time to time be  reduced  or  increased,  as  appropriate,  to
reflect exchanges,  redemptions and transfers of interests therein in accordance
with the terms of this  Indenture.  Any  endorsement of a Global Note to reflect
the amount of any increase or decrease in the  principal  amount of  outstanding
Notes  represented  thereby  shall be made by the  Trustee  in  accordance  with
instructions given by the Holder thereof as required by Section 2.07 hereof.

                  Except as set forth in  Section  2.07(a)  hereof,  the  Global
Notes may not be transferred except as a whole by the Depositary to a nominee of
the  Depositary or by the nominee of the Depositary to the Depositary or another
nominee  of  the  Depositary  or by the  nominee  of  the  Depositary  or by the
Depositary of any such nominee to a successor of the  Depositary or a nominee of
each successor.

                  (b) Book-Entry  Provisions.  The Company shall execute and the
Trustee shall,  in accordance with this Section 2.01(b) and Section 2.02 hereof,
authenticate and deliver the Global Notes to the Depositary.

                  Upon receipt of each Global Note  authenticated  and delivered
by  the  Trustee,  the  Depositary  shall  credit,  on its  internal  book-entry
registration and transfer system, its Participant's accounts with the respective
interests owned by such Participants.  Beneficial  ownership in the Global Notes
shall be limited to Participants and Indirect Participants.

                  So long as the  Depositary  is the  registered  holder  of any
Global Note, the  Participants  and Indirect  Participants  shall have no rights
under this  Indenture  or under any Global Note with respect to such Global Note
held on their behalf by the Depositary, and the Depositary may be treated by the
Company, the Trustee and any agent of the Company or the Trustee as the absolute
owner of such Global Note for the purpose of receiving  payment of or on account
of the principal of and,  subject to the provisions of this Indenture,  interest
on the Global Notes and for all other purposes.  Notwithstanding  the foregoing,
nothing  herein  shall  impair  the  operation  of  customary  practices  of the
Depositary  governing  the  exercise  of the rights of an owner of a  beneficial
interest in any Global Note.  No  beneficial  owner of an interest in any Global
Note shall be able to  transfer  such  interest  except in  accordance  with the
Applicable Procedures.

                  (c) Note  Forms.  The  provisions  of the form of Global  Note
contained in Exhibits A hereto are incorporated herein by reference.
<PAGE>

                  (d)  Dating.  Each  Note  shall  be  dated  the  date  of  its
authentication.

                  SECTION 2.02.  Execution and  Authentication.  Any director of
the  Company  shall  execute  the Notes on behalf  of the  Company  by manual or
facsimile  signature.  The Company's  common seal may be reproduced on the Notes
and may be in facsimile form.

                  If the director  whose  manual or facsimile  signature is on a
Note no longer holds that office at the time the Trustee  authenticates the Note
or at any time thereafter, the Note nevertheless shall be valid.

                  A Note shall not be valid until an  authorized  officer of the
Trustee  manually signs the  certificate  of  authentication  on the Note.  Such
signature  shall be  conclusive  evidence  that the Note has been  authenticated
under this Indenture.

                  The Trustee shall  authenticate Notes for original issue in an
aggregate  principal  amount at  maturity  not to exceed $[ ] upon  receipt of a
certificate  signed by any Officer or  attorney-in-fact  therefor  directing the
Trustee to  authenticate  the Notes.  The Global Notes shall be issuable only in
fully  registered  form and the  Certificated  Notes shall be  issuable  only in
registered  form.  The  Notes  shall  be  issued  without  coupons  and  only in
denominations  of U.S.  $1,000  principal  amount at  maturity  or any  integral
multiple thereof.

                  The Trustee may appoint an authenticating  agent acceptable to
the  Company  to  authenticate  Notes.  Unless  limited  by the  terms  of  such
appointment, an authenticating agent may authenticate Notes whenever the Trustee
may do so. Each  reference in this  Indenture to  authentication  by the Trustee
includes  authentication by such agent. Such authenticating agent shall have the
same rights as the Trustee in any  dealings  hereunder  with the Company or with
any of the Company's Affiliates.

                  SECTION 2.03.  Registrar  and Paying Agent.  The Company shall
maintain  an office or agency  where  Certificated  Notes may be  presented  for
registration of transfer or for exchange (the "Registrar"),  an office or agency
where Notes may be presented for payment (the "Paying Agent"),  and an office or
agency where  notices and demands to or upon the Company in respect of the Notes
and this  Indenture  may be  served,  in each case,  located  in the  Borough of
Manhattan,  The City of New York,  State of New York. The Registrar shall keep a
register  containing the names and addresses of all Holders (the "Register") and
of the transfer and exchange of Certificated Notes. Any notice to be given under
this Indenture or under the Notes by the Trustee or the Company to Holders shall
be mailed by first class mail to each Holder at its address as it appears at the
time  of  such  mailing  in the  Register.  The  Company  may  have  one or more
co-Registrars and one or more additional paying agents.  The term "Paying Agent"
includes any additional paying agent.  Except as otherwise  provided herein, the
Company or any Subsidiary  thereof may act as Paying Agent. The Company may also
from time to time  designate  one or more other  offices or  agencies  where the
Notes may be presented or surrendered  for any or all such purposes and may from
time to time rescind  such  designations.  The Company will give prompt  written
notice to the Trustee of any such designation or rescission and of any change in
the location of any such other office or agency.
<PAGE>

                  The Company shall enter into an appropriate  agency  agreement
with any  Agent  not a party to this  Indenture,  which  shall  incorporate  the
provisions of the TIA. The  agreement  shall  implement  the  provisions of this
Indenture that relate to such Agent. The Company shall notify the Trustee of the
name and address of any such Agent. If the Company fails to maintain a Registrar
or Paying Agent, or fails to give the foregoing notice, the Trustee shall act as
such and shall be  entitled  to  appropriate  compensation  in  accordance  with
Section 7.07.

                  The Company  initially  appoints the Corporate Trust Office of
the  Trustee in the  Borough of  Manhattan  located at the  address set forth in
Section  11.02 as  Registrar,  Paying Agent and agent for service of notices and
demands in connection with the Notes and this Indenture.

                  SECTION  2.04.  Holders to Be Treated as Owners;  Payments  of
Interest . (a) The Company, the Paying Agent, the Registrar, the Trustee and any
agent of the Company,  the Paying  Agent,  the Registrar or the Trustee may deem
and  treat  each  Holder  of a Note as the  absolute  owner of such Note for the
purpose of receiving  payment of or on account of the principal of and,  subject
to the provisions of this Indenture, and interest on such Note and for all other
purposes.  Neither the Company, the Paying Agent, the Registrar, the Trustee nor
any agent of the Company,  the Paying Agent,  the Registrar or the Trustee shall
be affected by any notice to the contrary. All such payments so made to any such
Person, or upon his order, shall be valid, and, to the extent of the sum or sums
so paid,  effectual to satisfy and discharge  the  liability for moneys  payable
upon any Note.

                  (b) The Holder of Certificated a Note at the close of business
on the Regular  Record Date with respect to any  Interest  Payment Date shall be
entitled  to  receive  the  interest  payable  on  such  Interest  Payment  Date
notwithstanding any transfer or exchange of such Certificated Note subsequent to
the Regular Record Date and prior to such Interest  Payment Date,  except if and
to the extent the Company  shall  default in the payment of the  interest due on
such Interest Payment Date, in which case such defaulted  interest shall be paid
in accordance with Section 2.13; provided that, in the event of an exchange of a
Certificated  Note for a beneficial  interest in any Global Note subsequent to a
Regular  Record Date or any  special  record date and prior to or on the related
Interest Payment Date, any payment of interest payable on such payment date with
respect to any such  Certificated Note shall be made to the Person in whose name
such Certificated Note was registered on such record date.  Payments of interest
on the  Global  Notes  will be made to the  Holder  of the  Global  Note on each
Interest  Payment Date;  provided  that, in the event of an exchange of all or a
portion of the Global  Note for  Certificated  Notes  subsequent  to the Regular
Record Date or any special  record date and prior to or on the related  Interest
Payment Date or other payment date under  Section 2.13,  any payment of interest
payable on such payment date with respect to the Certificated Note shall be made
to the Holder of the Global Note.

                  (c) The Trustee  shall pay  interest to the  Depositary,  with
respect  to  any  Global  Note  held  by  the  Depositary,  in  accordance  with
instructions received from the at least five business days before the applicable
Interest Payment Date.
<PAGE>

                  SECTION 2.05. Paying Agent to Hold Money in Trust. The Company
shall  require each Paying Agent other than the Trustee to agree in writing that
such  Paying  Agent  will hold in trust for the  benefit  of the  Holders or the
Trustee all money held by the Paying  Agent for the payment of  principal  of or
interest on the Notes  (whether such money has been paid to it by the Company or
any other  obligor on the Notes),  and the  Company  and the Paying  Agent shall
notify the Trustee of any  default by the  Company (or any other  obligor on the
Notes) in making any such payment.  Unless the Company or any  Subsidiary is the
Paying  Agent,  money held in trust by the Paying  Agent need not be  segregated
except as required  by law and in no event shall the Paying  Agent be liable for
any interest on any money received by it hereunder.  The Company at any time may
require the Paying  Agent to pay all money held by it to the Trustee and account
for any funds  disbursed and the Trustee may at any time during the  continuance
of any Event of Default  specified  in  Section  6.01(a)  or (b),  upon  written
request to the Paying  Agent,  require  such Paying Agent to pay  forthwith  all
money so held by it to the Trustee and to account for any funds disbursed.  Upon
making such  payment,  the Paying Agent shall have no further  liability for the
money delivered to the Trustee.  If the Company or any Subsidiary of the Company
acts as Paying Agent it shall, on or before each due date of the principal of or
interest  on the  Notes,  segregate  and hold in trust  for the  benefit  of the
Persons  entitled  thereto a sum  sufficient to pay the principal or interest so
becoming due until such sums shall be paid to such Persons or otherwise disposed
of as herein  provided  and will  promptly  notify the  Trustee of its action or
failure so to act.

                  SECTION 2.06.  Holder Lists.  The Trustee shall preserve in as
current a form as is reasonably practicable the most recent list available to it
from the  Registrar of the names and  addresses of the Holders of Notes.  If the
Trustee is not the Registrar,  the Company shall furnish to the Trustee at least
five Business Days before each Interest Payment Date, and at such other times as
the Trustee  may request in writing,  a list in such form and as of such date as
the Trustee may reasonably  require of the names and addresses of the Holders of
Notes, if any.

                  SECTION 2.07. Transfer and Exchange. (a) Transfer and Exchange
of Global Notes.  Except as provided  below,  transfers of Global Notes shall be
limited to  transfers  of such Global  Notes in whole,  but not in part,  to the
Depositary.  Certificated Notes shall be transferred to all beneficial owners in
exchange  for  their  beneficial  interests  in the  Global  Notes  if  (i)  the
Depositary or Company delivers to the Trustee notice from the Depositary that it
is unwilling or unable to continue to act as Depositary  for the Global Notes or
at any time ceases to be a clearing  agency  registered  under the  Exchange Act
and, in either  case,  a successor  Depositary  is not  appointed by the Company
within 120 days after the date of such notice from the  Depositary;  or (ii) the
Company in its sole  discretion  determines  that the Global Notes (in whole but
not in part) should be exchanged for  Certificated  Notes and delivers a written
notice to such effect to the Trustee.

                  (i) In  connection  with  any  transfer  of a  portion  of the
         beneficial  interests in the Global Notes to beneficial owners pursuant
         to paragraph (a) above,  the  Registrar  shall reflect on its books and
         records the date and a decrease in the principal  amount of such Global
         Notes in an amount  equal to the  principal  amount  of the  beneficial
         interest in such 


<PAGE>

         Global Notes to be transferred,  and the Company shall execute, and the
         Trustee shall  authenticate and deliver, one or more Certificated Notes
         of like tenor and amount.

                  (ii) In connection  with the transfer of an entire Global Note
         to beneficial  owners pursuant to paragraph (a) above,  the Global Note
         shall be deemed to be surrendered to the Trustee for cancellation,  and
         the Company  shall  execute,  and the Trustee  shall  authenticate  and
         deliver,  to each  beneficial  owner  identified  by the  Depositary in
         exchange  for its  beneficial  interest  in the  Global  Note an  equal
         aggregate   principal  amount  of  Certificated   Notes  of  authorized
         denominations.

                  (b)  Transfer  and  Exchange of  Beneficial  Interests  in the
         Global Note.  The transfer and exchange of beneficial  interests in the
         Global Notes shall be effected  through the  Depositary,  in accordance
         with  this  Indenture  and  Applicable  Procedures  of  the  Depositary
         therefor.

                  (c)  Transfer  and  Exchange  of  Certificated   Notes.   When
         Certificated  Notes are presented by a Holder to the  Registrar  with a
         request  to  register  the  transfer  of the  Certificated  Notes or to
         exchange  such  Certificated  Notes  for an equal  principal  amount of
         Certificated  Notes of other  authorized  denominations,  the Registrar
         shall  register the transfer or make the exchange as requested  only if
         the Certificated Notes are presented or surrendered for registration of
         transfer  or exchange  and are  endorsed  or  accompanied  by a written
         instrument  of  transfer in form  satisfactory  to the  Registrar  duly
         executed by such Holder or by his attorney,  duly authorized in writing
         and upon receipt of such certificates.

                  (d)      Legends.

                  (i) Global Note  Legend.  Each Global Note shall bear a legend
         in substantially the following form:

         "THIS  NOTE IS HELD BY THE  DEPOSITARY  (AS  DEFINED  IN THE  INDENTURE
         GOVERNING  THIS NOTE) IN  CUSTODY  FOR THE  BENEFIT  OF THE  BENEFICIAL
         OWNERS  HEREOF,  AND  IS  NOT  TRANSFERABLE  TO ANY  PERSON  UNDER  ANY
         CIRCUMSTANCES  EXCEPT  THAT (I) THIS GLOBAL  NOTE MAY BE  EXCHANGED  IN
         WHOLE BUT NOT IN PART  PURSUANT  TO SECTION  2.07(a) OF THE  INDENTURE,
         (II) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR  CANCELLATION
         PURSUANT TO SECTION  2.12 OF THE  INDENTURE  AND (III) THIS GLOBAL NOTE
         MAY BE  TRANSFERRED  TO A SUCCESSOR  DEPOSITARY  WITH THE PRIOR WRITTEN
         CONSENT OF ORION NEWCO SERVICES, INC."

                  (ii) Unit  Legend.  Each Note issued  prior to the  Separation
         Date shall bear the  following  legend (the "Unit  Legend") on the face
         thereof:
<PAGE>

         "THE NOTES EVIDENCED BY THIS  CERTIFICATE ARE INITIALLY  ISSUED AS PART
         OF AN  ISSUANCE  OF UNITS,  EACH OF WHICH  CONSISTS  OF $[ ]  PRINCIPAL
         AMOUNT  OF  THE  NOTES  AND  ONE  WARRANT   (EACH,   A  "WARRANT"   AND
         COLLECTIVELY, THE "WARRANTS") INITIALLY ENTITLING THE HOLDER THEREOF TO
         PURCHASE [ ] SHARES OF COMMON  STOCK,  PAR VALUE  $.01 PER SHARE,  (THE
         "COMMON STOCK")."

                  (e)  General   Provisions   Relating  to  All   Transfers  and
Exchanges.  (i) To permit registrations of transfers and exchanges,  the Company
shall execute and the Trustee shall  authenticate  Global Notes and Certificated
Notes upon the Company's order or at the Registrar's request.

                  (i) No  service  charge  shall  be  made to a  Holder  for any
registration  of transfer or exchange,  but the Company may require payment of a
sum sufficient to cover any stamp or transfer tax or similar governmental charge
payable in connection  therewith (other than any such stamp or transfer taxes or
similar  governmental  charge  payable  upon  exchange or  transfer  pursuant to
Sections 2.11, 3.07, 4.11, 4.13 and 9.04 hereof).

                  (ii) All Global Notes and  Certificated  Notes issued upon any
registration of transfer or exchange of Global Notes or Certificated Notes shall
be the valid obligations of the Company,  evidencing the same debt, and entitled
to the same benefits under this  Indenture,  as the Global Notes or Certificated
Notes surrendered upon such registration of transfer or exchange.

                  (iii) The  Company  shall  not be  required  (A) to issue,  to
register the transfer of or to exchange  Notes during a period  beginning at the
opening  of  business  15 days  before  the day of any  selection  of Notes  for
redemption  under Section 3.03 hereof and ending at the close of business on the
day of  selection,  (B) to register  the  transfer of or to exchange any Note so
selected for redemption in whole or in part,  except the  unredeemed  portion of
any  Note  being  redeemed  in part or (C) to  register  the  transfer  of or to
exchange a Note between a record date and the next succeeding  Interest  Payment
Date.

                  (iv)  Prior  to due  presentment  for  the  registration  of a
transfer of any Note, the Trustee,  any Agent and the Company may deem and treat
the Person in whose name any Note is  registered  as the absolute  owner of such
Note for the purpose of  receiving  payment of principal of and interest on such
Notes and for all other  purposes,  and neither the  Trustee,  any Agent nor the
Company shall be affected by notice to the contrary.

                  (v)  The  Trustee   shall   authenticate   Global   Notes  and
Certificated Notes in accordance with the provisions of Section 2.02 hereof.

                  SECTION 2.08.  Replacement Notes . If a mutilated Certificated
Note is surrendered to the Registrar or the Trustee,  if a mutilated Global Note
is  surrendered  to the Company or the Trustee or if the Company and the Trustee
receive evidence to their satisfaction that any Note has been lost, destroyed or
stolen, the Company shall issue and the Trustee shall 


<PAGE>

authenticate  a  replacement  Note in such  form as the Notes  mutilated,  lost,
destroyed or wrongfully taken if (i) in the case of a lost,  destroyed or stolen
Note, the Holder of such Note furnishes to the Company,  the Trustee and, in the
case of a Certificated Note, the Registrar,  evidence  reasonably  acceptable to
them of the ownership and the  destruction,  loss or theft of such Note and (ii)
an  indemnity  bond  shall  be  posted  by the  Holder  requesting  replacement,
sufficient in the judgment of each to protect the Company, the Registrar (in the
case of a  Certificated  Note ), the Trustee or any Agent from any loss that any
of them may suffer if such Note is  replaced.  Prior to the issuance of any such
replacement  Note, the Trustee shall notify the Company of any request therefor.
The Company may charge such Holder for the Company's  out-of-pocket  expenses in
replacing  such Note and the  Trustee  may charge  the Holder for the  Trustee's
expenses in replacing  such Note.  Every  replacement  Note shall  constitute an
additional  obligation  of the  Company  and  shall  be  entitled  to all of the
benefits  of this  Indenture  equally  and  proportionally  with all other Notes
issued  hereunder.  The  provisions of this Section 2.08 are exclusive and shall
preclude  (to the  extent  permitted  by  applicable  law) all other  rights and
remedies with respect to the replacement of mutilated, lost, destroyed or stolen
Notes.

                  SECTION 2.09. Outstanding Notes . The Notes outstanding at any
time are all Notes that have been  authenticated  by the Trustee  except for (a)
those  cancelled by it, (b) those delivered to it for  cancellation,  (c) to the
extent set forth in  Sections  8.01 and 8.02,  on or after the date on which the
conditions  set forth in Section 8.01 or 8.02 have been  satisfied,  those Notes
theretofore  authenticated  and delivered by the Trustee hereunder and (d) those
described in this Section 2.09 as not  outstanding.  Subject to Section  2.10, a
Note  does  not  cease  to be  outstanding  because  the  Company  or one of its
Affiliates holds the Note.

                  If a Note is replaced  pursuant to Section  2.08, it ceases to
be outstanding  unless the Trustee  receives proof  satisfactory  to it that the
replaced  Note is held by a bona fide  purchaser  in whose  hands such Note is a
legal, valid and binding obligation of the Company.

                  If the  principal  amount of any Note is considered to be paid
under Section 4.01, it ceases to be outstanding and interest thereon shall cease
to accrue.

                  If the Paying  Agent holds,  in its  capacity as such,  on the
Stated Maturity of a Note, on any Redemption Date or on any Payment Date,  money
sufficient to pay all accrued interest and Liquidated Damages and principal with
respect to such Notes  payable on that date and is not  prohibited  from  paying
such money to the Holders thereof pursuant to the terms of this Indenture,  then
on and after that date such Notes cease to be  outstanding  and interest on them
ceases to accrue.

                  SECTION  2.10.  Treasury  Notes . In  determining  whether the
Holders  of the  required  principal  amount  of  Notes  have  concurred  in any
direction,  waiver or consent or any amendment,  modification or other change to
this Indenture,  Notes owned by the Company or an Affiliate of the Company shall
be disregarded as though they were not outstanding, except that for the purposes
of  determining  whether the Trustee  shall be  protected in relying on any


<PAGE>

such direction, waiver or consent or any amendment, modification or other change
to this Indenture, only Notes that the Trustee actually knows are so owned shall
be so disregarded.

                  SECTION 2.11.  Temporary  Notes . Until  definitive  Notes are
prepared and ready for delivery,  the Company may prepare and the Trustee shall,
upon receipt of a Company Order,  authenticate  temporary Notes. Temporary Notes
shall be  substantially  in the form of definitive Notes but may have variations
that the Company considers appropriate for temporary Notes. Without unreasonable
delay, the Company shall prepare and the Trustee shall  authenticate  definitive
Notes in exchange for temporary  Notes.  Until such  exchange,  temporary  Notes
shall be entitled to the same rights,  benefits  and  privileges  as  definitive
Notes.

                  SECTION  2.12.   Cancellation  .  All  Notes  surrendered  for
payment, redemption,  registration of transfer or exchange shall, if surrendered
to any Person other than the  Trustee,  be delivered to the Trustee and shall be
promptly cancelled by it. The Company may at any time deliver to the Trustee for
cancellation any Notes previously  authenticated  and delivered  hereunder which
the Company may have acquired in any manner  whatsoever,  and may deliver to the
Trustee (or to any other Person for  delivery to the  Trustee) for  cancellation
any Notes  previously  authenticated  hereunder which the Company has not issued
and sold, and all Notes so delivered shall be promptly cancelled by the Trustee.
If the Company  shall so acquire  any of the Notes,  however,  such  acquisition
shall  not  operate  as  a  redemption  or  satisfaction  of  the   indebtedness
represented  by such  Notes  unless  and until the same are  surrendered  to the
Trustee  for  cancellation.  No Notes  shall be  authenticated  in lieu of or in
exchange for any Notes  cancelled as provided in this  Section  2.12,  except as
expressly  permitted by this Indenture.  All cancelled Notes held by the Trustee
shall be disposed of by the Trustee in accordance with its customary  procedures
and  certification of their disposal  delivered to the Company unless by Company
Order the Company shall direct that cancelled Notes be returned to it.

                  SECTION 2.13.  Defaulted Interest . If the Company defaults on
a payment of interest on the Notes, it shall pay the defaulted interest plus (to
the extent permitted by law) any interest  payable on the defaulted  interest in
accordance  with  the  terms  hereof,  to (a) the  Persons  who are  Holders  of
Certificated  Notes,  if any, on a subsequent  special  record date,  which date
shall  be at  least  five  Business  Days  prior  to the  payment  date for such
defaulted interest,  and (b) if any Global Notes are outstanding on such payment
date, to the Holder of the Global Notes on such payment date.  The Company shall
fix  such  special  record  date  and  payment  date  in  a  manner   reasonably
satisfactory  to the Trustee.  At least 15 days before such special record date,
the Company shall mail to each Holder of Certificated  Notes, if any, and if the
Global Notes are still outstanding,  to the Holder thereof and the Depositary, a
notice that states the special  record date,  the payment date and the amount of
defaulted interest and interest payable on such defaulted interest to be paid.

                  SECTION  2.14.  CUSIP,  CINS or ISIN  Number . The  Company in
issuing the Notes may use a "CUSIP,"  "CINS" or "ISIN"  number,  and if so, such
CUSIP,  CINS  or ISIN  number  shall  be  included  in  notices  of  redemption,
repurchase or exchange as a convenience to Holders, provided,  however, that any
such notice may state that no  representation  is made as to the  correctness or
accuracy  of the  CUSIP,  CINS or ISIN  number  printed  in the notice or on the
<PAGE>

Notes, and that reliance may be placed only on the other identification  numbers
printed on the Notes; and provided,  further that failure to use CUSIP,  CINS or
ISIN  numbers in any notice of  redemption,  repurchase  or  exchange  shall not
affect the validity or  sufficiency  of such notice.  The Company will  promptly
notify the Trustee of any change in the CUSIP, CINS or ISIN number.

                  SECTION  2.15.  Deposit of Moneys . Prior to 12:00  noon,  New
York City time,  on each Interest  Payment  Date, at the Stated  Maturity of the
Notes,  on each  Redemption  Date,  on each Payment Date and on the Business Day
immediately  following any  acceleration  of the Notes pursuant to Section 6.02,
the Company shall deposit with the Paying Agent in immediately  available  funds
money (in United States dollars)  sufficient to make cash payments,  if any, due
on such Interest Payment Date, Stated Maturity, Redemption Date, Payment Date or
Business  Day, as the case may be, in a timely  manner which permits the Trustee
to remit payment to the Holders on such Interest Payment Date,  Stated Maturity,
Redemption Date, Payment Date or Business Day, as the case may be.


                                  ARTICLE THREE
                                   REDEMPTION

                  SECTION  3.01.  Right  of  Redemption  .  The  Notes  will  be
redeemable,  at the Company's  option,  in whole or in part, at any time or from
time to time, on or after [ ], 2002 and prior to maturity, upon not less than 30
nor more than 60 days' prior notice  mailed by first class mail to each Holders'
last address as it appears in the Note  Register,  at the  following  Redemption
Prices (expressed in percentages of principal amount at maturity),  plus accrued
and unpaid  interest,  if any, to the  Redemption  Date (subject to the right of
Holders of record on the relevant Regular Record Date that is on or prior to the
Redemption  Date to  receive  interest  due on an  Interest  Payment  Date),  if
redeemed  during  the  12-month  period  commencing  [ ], of the years set forth
below:


          Year                                       Redemption Price 
          ----                                       ---------------- 
          2002                                          [_____]%
          2003                                          [_____]%
          2004 and thereafter                           100.000%
          



<PAGE>




                  SECTION  3.02.  Notices to Trustee . If the Company  elects to
redeem Notes pursuant to Section 3.01, it shall notify the Trustee in writing of
(i) the clause of the Indenture  pursuant to which the  redemption  shall occur,
(ii) the Redemption Date, (iii) the principal amount at stated maturity of Notes
to be redeemed plus interest accrued thereon, if any, to the Redemption Date and
(iv) the Redemption Price.


                  The  Company  shall  give  each  notice  provided  for in this
Section 3.02 in an  Officers'  Certificate  at least 15 days before  mailing the
notice to Holders referred to in Section 3.01.

                  SECTION 3.03.  Selection of Notes to Be Redeemed . In the case
of any partial redemption, selection of the Notes for redemption will be made by
the  Trustee in  compliance  with the  requirements  of the  principal  national
securities exchange,  if any, on which the Notes are listed or, if the Notes are
not listed on a national securities exchange,  on a pro rata basis, by lot or by
such other  method as the Trustee in its sole  discretion  shall deem to be fair
and appropriate; provided that no Note of $1,000 in principal amount at maturity
or less shall be redeemed  in part.  If any Note is to be redeemed in part only,
the notice of  redemption  relating  to such Note shall state the portion of the
principal  amount at maturity  thereof to be  redeemed.  A new Note in principal
amount at maturity equal to the unredeemed portion thereof will be issued in the
name of the Holder thereof upon cancellation of the original Note.

                  SECTION  3.04.  Notice of  Redemption  . With  respect  to any
redemption of Notes pursuant to Section 3.01, at least 30 days but not more than
60 days before a Redemption  Date, the Company shall mail a notice of redemption
by first  class  mail to each  Holder  whose  Notes are to be  redeemed  at such
Holder's registered address.

                  The notice  shall  identify the Notes to be redeemed and shall
state:

                  (a)      the Redemption Date;

                  (b)      the Redemption Price;

                  (c)      the name and address of the Paying Agent;

                  (d) that Notes called for  redemption  must be  surrendered to
         the Paying Agent in order to collect the Redemption Price;

                  (e) the  paragraph  of the Notes  and/or  the  Section of this
         Indenture  pursuant to which the Notes called for  redemption are being
         redeemed;

                  (f) that, unless the Company defaults in making the redemption
         payment,  interest on Notes called for  redemption  ceases to accrue on
         and  after  the  Redemption  Date and the only  remaining  right of the
         Holders is to  receive  payment of the  


<PAGE>

         Redemption  Price plus  accrued interest  to the  Redemption  Date upon
         surrender  of the Notes to the Paying Agent;

                  (g) that, if any Note is being  redeemed in part,  the portion
         of the  principal  amount  (equal to $1,000 in principal  amount or any
         integral multiple thereof) of such Note to be redeemed and that, on and
         after the Redemption  Date,  upon surrender of such Note, a new Note or
         Notes in principal amount equal to the unredeemed  portion thereof will
         be reissued; and

                  (h) that,  if any Note contains a CUSIP,  CINS,  ISIN or other
         identification number as provided in Section 2.14, no representation is
         being  made as to the  correctness  of the CUSIP,  CINS,  ISIN or other
         identification number either as printed on the Notes or as contained in
         the notice of  redemption  and that  reliance may be placed only on the
         other identification numbers printed on the Notes.

                  At the Company's  request  contained in a Company Order (which
request may be revoked by the Company at any time prior to the time at which the
Trustee  shall have given such  notice to the  Holders),  made to the Trustee at
least 15 days before mailing the notice to Holders  referred to in Section 3.01,
the Trustee  shall give such notice of redemption in the name and at the expense
of the Company.  If, however,  the Company gives such notice to the Holders, the
Company  shall  concurrently  deliver to the  Trustee an  Officers'  Certificate
stating that such notice has been given. Notice of redemption shall be deemed to
be given when  mailed,  whether or not the Holder  receives  the notice.  In any
event, failure to give such notice, or any defect therein,  shall not affect the
validity of the  proceedings for the redemption of Notes held by Holders to whom
such notice was properly given.

                  SECTION 3.05. Deposit of Redemption Price . On or prior to any
Redemption  Date,  the Company  shall  deposit with the Paying Agent (or, if the
Company is acting as its own Paying Agent,  shall segregate and hold in trust as
provided in section 2.05 )money  sufficient to pay the Redemption  Price of, and
accrued and unpaid  interest on all Notes to be redeemed on that date other than
Notes or  portions  thereof  called for  redemption  on that date that have been
delivered by the Company to the Trustee for cancellation.

                  SECTION  3.06.  Payment of Notes  Called for  Redemption  . If
notice of redemption has been given to Holders in the manner provided above, the
Notes or portion of Notes  specified in such notice to be redeemed  shall become
irrevocably  due and  payable on the  Redemption  Date at the  Redemption  Price
stated therein,  together with accrued  interest to such Redemption Date, and on
and after any such  Redemption  Date  (unless the Company  shall  default in the
payment  of Notes to be  redeemed  on such date at the  Redemption  Price,  plus
accrued  interest to the  Redemption  Date, in which case the  principal,  until
paid, shall bear interest from the Redemption Date at the rate prescribed in the
Notes),  such Notes shall cease to accrue  interest.  Upon surrender of any Note
for  redemption in accordance  with a notice of  redemption,  such Note shall be
paid and redeemed by the Company at the Redemption  Price, plus accrued interest
to the  Redemption  Date,  provided that  installments  of interest whose Stated
Maturity is 


<PAGE>

on or prior to the Redemption Date shall be payable to the Holders registered as
such at the close of business on the relevant Regular Record Date.

                  SECTION 3.07.  Notes Redeemed in Part . Upon  cancellation  of
any Note that is redeemed in part, the Company shall issue and the Trustee shall
authenticate  and deliver to the Holder a new Note equal in principal  amount to
the unredeemed portion of such surrendered Note.


                                  ARTICLE FOUR
                                    COVENANTS

                  SECTION  4.01.  Payment of Notes . The  Company  shall pay the
principal of, premium, if any, and interest on the Notes on the dates and in the
manner  provided in the Notes and this  Indenture.  An installment of principal,
premium,  interest  shall be  considered  paid on the date due if the Trustee or
Paying  Agent  (other than the Company,  a  Subsidiary  of the  Company,  or any
Affiliate of any of them) holds as of 10:00AM New York City time on the due date
money deposited by the Company in immediately available funds and designated for
and sufficient to pay the installment.
                  SECTION  4.02.  Issuances  of  Guarantees  by  New  Restricted
Subsidiaries.  The Company  will  provide to the  Trustee,  on the date that any
Person  becomes  a  Restricted  Subsidiary,  a  supplemental  indenture  to this
Indenture, executed by such new Restricted Subsidiary,  providing for a full and
unconditional  guarantee on a senior basis by such new Restricted  Subsidiary of
the Company's obligations under the Notes and this Indenture;  provided that, in
the case of any new Restricted  Subsidiary that becomes a Restricted  Subsidiary
through the acquisition of a majority of its voting Capital Stock by the Company
or any other  Restricted  Subsidiary,  such guarantee may be subordinated to the
extent required by the obligations of such new Restricted Subsidiary existing on
the date of such  acquisition  that were not incurred in  contemplation  of such
acquisition.

                  SECTION  4.03.  Limitation on  Indebtedness  . (a) The Company
will not, and will not permit any of its Restricted  Subsidiaries  to, Incur any
Indebtedness  (other  than the Notes and  Indebtedness  existing  on the Closing
Date);  provided that the Company may Incur Indebtedness if, after giving effect
to the Incurrence of such  Indebtedness  and the receipt and  application of the
proceeds therefrom,  the Consolidated  Leverage Ratio would be greater than zero
and less than 6 to 1.

                  Notwithstanding the foregoing,  the Company and any Restricted
Subsidiary (except as specified below) may Incur each and all of the following:

                  (i) Indebtedness  outstanding at any time that is (A) Incurred
         to finance the purchase, construction,  launch, insurance for and other
         costs  with  respect  to  Orion 2 and  Orion  3 or (B) in an  aggregate
         principal  amount not to exceed  (1) until  Orion 2 or Orion 3 has been
         successfully  delivered in orbit,  $50 million,  (2) after the first of
         Orion 2 or Orion 3 has  been  successfully  delivered  in  orbit,  $100
         million  and (3)  after  the  second 


<PAGE>

         of  Orion 2 or  Orion 3 has  been successfully delivered in orbit, $150
         million, in each case under this clause (i)(B);

                  (ii) Indebtedness owed (A) to the Company or (B) to any of its
         Restricted  Subsidiaries;  provided that any event which results in any
         such Restricted Subsidiary ceasing to be a Restricted Subsidiary or any
         subsequent  transfer of such Indebtedness (other than to the Company or
         another  Restricted  Subsidiary)  shall be  deemed,  in each  case,  to
         constitute  an Incurrence  of such  Indebtedness  not permitted by this
         clause (ii);

                  (iii) Indebtedness issued in exchange for, or the net proceeds
         of  which  are  used  to   refinance   or  refund,   then   outstanding
         Indebtedness,  other than  Indebtedness  Incurred  under clause (i)(B),
         (ii),  (iv),  (vi) or (viii) of this  paragraph,  and any  refinancings
         thereof in an amount not to exceed the amount so refinanced or refunded
         (plus premiums,  accrued  interest,  fees and expenses);  provided that
         Indebtedness  the proceeds of which are used to refinance or refund the
         Notes,  the Note Guarantee or Indebtedness  that is pari passu with, or
         subordinated  in right of payment to, the Notes shall only be permitted
         under this clause (iii) if (A) in case the Notes or the Note  Guarantee
         are  refinanced  in part or the  Indebtedness  to be refinanced is pari
         passu with the Notes or the Note Guarantee,  such new Indebtedness,  by
         its terms or by the terms of any  agreement or  instrument  pursuant to
         which such new  Indebtedness  is  outstanding,  is expressly  made pari
         passu with, or subordinate in right of payment to, the remaining  Notes
         or the Note Guarantee, as the case may be, (B) in case the Indebtedness
         to be  refinanced is  subordinated  in right of payment to the Notes or
         the Note Guarantee, such new Indebtedness, by its terms or by the terms
         of any agreement or instrument  pursuant to which such new Indebtedness
         is issued or remains  outstanding,  is expressly  made  subordinate  in
         right of  payment  to the Notes or the Note  Guarantee  at least to the
         extent that the  Indebtedness  to be refinanced is  subordinated to the
         Notes or the  Note  Guarantee,  as the  case  may be,  and (C) such new
         Indebtedness,  determined  as of the  date of  Incurrence  of such  new
         Indebtedness,  does not  mature  prior to the  Stated  Maturity  of the
         Indebtedness to be refinanced or refunded, and the Average Life of such
         new Indebtedness is at least equal to the remaining Average Life of the
         Indebtedness to be refinanced or refunded;

                  (iv)  Indebtedness  (A) in respect of  performance,  surety or
         appeal  bonds  provided in the ordinary  course of business,  (B) under
         Currency  Agreements and Interest Rate  Agreements;  provided that such
         agreements  (a) are  designed  solely to  protect  the  Company  or its
         Subsidiaries against fluctuations in foreign currency exchange rates or
         interest rates and (b) do not increase the  Indebtedness of the obligor
         outstanding  at any time  other  than as a result  of  fluctuations  in
         foreign currency exchange rates or interest rates or by reason of fees,
         indemnities and  compensation  payable  thereunder and (C) arising from
         agreements providing for indemnification,  adjustment of purchase price
         or similar obligations, or from Guarantees or letters of credit, surety
         bonds or performance  bonds securing any  obligations of the Company or
         any of its Restricted Subsidiaries pursuant to such agreements,  in any
         case  Incurred in  connection  with the  disposition  of any  business,
         assets or Restricted  Subsidiary of the Company (other than  Guarantees
         of 


<PAGE>

         Indebtedness  Incurred  by any  Person acquiring  all or any portion of
         such business,  assets or Restricted  Subsidiary of the Company for the
         purpose of financing such  acquisition),  in a principal  amount not to
         exceed  the gross  proceeds  actually  received  by the  Company or any
         Restricted Subsidiary in connection with such disposition;

                  (v)  Indebtedness  of the  Company,  to  the  extent  the  net
         proceeds thereof are promptly (A) used to purchase Notes tendered in an
         Offer to  Purchase  made as a  result  of a Change  in  Control  or (B)
         deposited  to defease the Notes as  described  in Section  8.02 of this
         Indenture;  (vi) Guarantees of the Notes and Guarantees of Indebtedness
         of the Company by any Restricted  Subsidiary  provided the Guarantee of
         such  Indebtedness  is  permitted  by and made in  accordance  with the
         Section 4.07 of this Indenture;

                  (vii) Indebtedness Incurred to finance the cost (including the
         cost of design, development, construction,  installation,  improvement,
         transportation  or  integration)  of equipment  (other than Orion 2 and
         Orion  3)  or  inventory  acquired  by  the  Company  or  a  Restricted
         Subsidiary after the Closing Date;

                  (viii)  Indebtedness of the Company not to exceed,  at any one
         time  outstanding,  two times  the Net Cash  Proceeds  received  by the
         Company  after  the  Closing  Date  from the  issuance  and sale of its
         Capital Stock (other than Disqualified Stock) to a Person that is not a
         Subsidiary of the Company (less the amount of such proceeds  applied as
         provided in clause  (C)(2) of the first  paragraph  or clause  (iii) or
         (iv) of the second  paragraph of the Section  4.04 of this  Indenture);
         provided  that such  Indebtedness  does not mature  prior to the Stated
         Maturity  of the Notes and has an Average  Life  longer than the Notes;
         and

                  (ix)     Redemption Indebtedness.

         (b) Notwithstanding  any other provision of this Section covenant,  the
maximum amount of Indebtedness  that the Company or a Restricted  Subsidiary may
incur  pursuant to this Section  4.03 shall not be deemed to be  exceeded,  with
respect  to  any  outstanding   Indebtedness,   due  solely  to  the  result  of
fluctuations in the exchange rates of currencies.

         (c) For purposes of determining  any particular  amount of Indebtedness
under this Section, (1) Guarantees, Liens or obligations with respect to letters
of credit  supporting  Indebtedness  otherwise  included in the determination of
such particular  amount shall not be included and (2) any Liens granted pursuant
to the equal and ratable  provisions  referred  to in the  Section  4.09 of this
Indenture  shall not be treated as  Indebtedness.  For  purposes of  determining
compliance  with this Section  4.03,  in the event that an item of  Indebtedness
meets the  criteria of more than one of the types of  Indebtedness  described in
the above clauses, the Company, in its sole discretion, shall classify such item
of  Indebtedness  and only be  required  to include  the amount and type of such
Indebtedness in one of such clauses.

         (d) In the event that the Company or any  Restricted  Subsidiary  shall
repay any  Indebtedness  (other  than the Notes)  pursuant  to clause  (i)(A) of
Section  4.11,  the  aggregate  amount of  Indebtedness  which may  otherwise be
Incurred  under clauses  (i)(B) and (viii) of the


<PAGE>

second  paragraph of paragraph  (a) of this Section 4.03 shall be reduced by the
amount of such repayment. The Company shall designate how much of such reduction
shall be applied to each such clause.

                  SECTION 4.04.  Limitation on Restricted Payments . The Company
will not, and will not permit any Restricted Subsidiary, directly or indirectly,
to (i) declare or pay any dividend or make any  distribution  on or with respect
to its Capital Stock (other than (x) dividends or  distributions  payable solely
in shares of its Capital  Stock (other than  Disqualified  Stock) or in options,
warrants or other  rights to acquire  shares of such  Capital  Stock and (y) pro
rata dividends or distributions on Common Stock of Restricted  Subsidiaries held
by minority  stockholders,  provided that such dividends do not in the aggregate
exceed  the   minority   stockholders'   pro  rata  share  of  such   Restricted
Subsidiaries'  net  income  from the first day of the fiscal  quarter  beginning
immediately  following  the Closing Date) held by Persons other than the Company
or any  of  its  Restricted  Subsidiaries,  (ii)  purchase,  redeem,  retire  or
otherwise  acquire  for value any shares of Capital  Stock of the  Company,  any
Guarantor or an Unrestricted  Subsidiary  (including options,  warrants or other
rights to acquire such shares of Capital  Stock) held by Persons  other than the
Company and its Wholly Owned Subsidiaries,  (iii) make any voluntary or optional
principal payment, or voluntary or optional redemption,  repurchase, defeasance,
or other  acquisition or retirement for value,  of  Indebtedness  of the Company
that is  subordinated  in right of payment to the Notes or of any Guarantor that
is subordinated  to the Note Guarantee  (other than, in each case, the purchase,
repurchase or the  acquisition of  Indebtedness  in anticipation of satisfying a
sinking fund obligation,  principal  installment or final maturity,  in any case
due within  one year of the date of  acquisition)  or (iv) make any  Investment,
other than a Permitted  Investment,  in any Person  (such  payments or any other
actions  described  in clauses (i) through (iv) being  collectively  "Restricted
Payments")  if,  at the time of,  and  after  giving  effect  to,  the  proposed
Restricted Payment: (A) a Default or Event of Default shall have occurred and be
continuing,  (B) except with respect to Investments  and dividends on the Common
Stock  of any  Guarantor,  the  Company  could  not  Incur  at  least  $1.00  of
Indebtedness  under the first  paragraph  of Section  4.03 or (C) the  aggregate
amount of all  Restricted  Payments  (the amount,  if other than in cash,  to be
determined in good faith by the Board of Directors, whose determination shall be
conclusive  and  evidenced  by a Board  Resolution)  made after the Closing Date
shall  exceed  the  sum of  (1)  50% of the  aggregate  amount  of the  Adjusted
Consolidated Net Income (or, if the Adjusted  Consolidated Net Income is a loss,
minus 100% of the amount of such loss) (determined by excluding income resulting
from  transfers  of assets  by the  Company  or a  Restricted  Subsidiary  to an
Unrestricted  Subsidiary) accrued on a cumulative basis during the period (taken
as one  accounting  period)  beginning  on the first day of the  fiscal  quarter
immediately  following  the Closing  Date and ending on the last day of the last
fiscal quarter  preceding the Transaction Date for which reports have been filed
pursuant to plus (2) the aggregate Net Cash Proceeds  received by the Company or
any Guarantor after the Closing Date from the issuance and sale permitted by the
Indentures of its Capital Stock (other than Disqualified  Stock) to a Person who
is not a  Subsidiary  of the Company or any  Guarantor or from the issuance to a
Person who is not a Subsidiary  of the Company or any  Guarantor of any options,
warrants or other rights to acquire  Capital Stock of the Company (in each case,
exclusive of any  Disqualified  Stock or any  options,  warrants or other rights
that are redeemable at the option of the holder, or are required to be redeemed,


<PAGE>

prior to the Stated  Maturity of the  Notes),  in each case except to the extent
such Net Cash Proceeds are used to Incur Indebtedness  pursuant to clause (viii)
of the second  paragraph under Section 4.03, plus (3) an amount equal to the net
reduction in Investments (other than reductions in Permitted Investments) in any
Person  resulting  from  payments  of  interest  on   Indebtedness,   dividends,
repayments of loans or advances,  or other transfers of assets,  in each case to
the Company or any Restricted  Subsidiary or from the Net Cash Proceeds from the
sale of any such  Investment  (except,  in each  case,  to the  extent  any such
payment or proceeds are included in the calculation of Adjusted Consolidated Net
Income),  or from  redesignations  of  Unrestricted  Subsidiaries  as Restricted
Subsidiaries   (valued  in  each  case  as   provided  in  the   definition   of
"Investments"),  not  to  exceed,  in  each  case,  the  amount  of  Investments
previously  made by the Company or any  Restricted  Subsidiary in such Person or
Unrestricted Subsidiary.

                  The foregoing provision shall not be violated by reason of:

                  (i) the payment of any dividend  within 60 days after the date
         of declaration  thereof if, at said date of  declaration,  such payment
         would comply with the foregoing paragraph;

                  (ii)  the   redemption,   repurchase,   defeasance   or  other
         acquisition   or  retirement   for  value  of   Indebtedness   that  is
         subordinated  in right of payment to the Notes  including  premium,  if
         any,  and  accrued and unpaid  interest,  with the  proceeds  of, or in
         exchange for,  Indebtedness  Incurred  under clause (iii) of the second
         paragraph of part (a) of Section 4.03;

                  (iii)  the  repurchase,  redemption  or other  acquisition  of
         Capital  Stock of the Company (or options,  warrants or other rights to
         acquire such Capital  Stock) in exchange for, or out of the proceeds of
         a substantially  concurrent offering of, shares of Capital Stock (other
         than Disqualified Stock) of the Company;

                  (iv) the making of any  principal  payment or the  repurchase,
         redemption,  retirement,  defeasance or other  acquisition for value of
         Indebtedness  of the Company which is  subordinated in right of payment
         to  the  Notes  in  exchange   for,  or  out  of  the  proceeds  of,  a
         substantially  concurrent  offering of,  shares of the Capital Stock of
         the Company (other than Disqualified Stock);

                  (v)  payments or  distributions,  to  dissenting  stockholders
         pursuant  to  applicable  law,  pursuant  to or in  connection  with  a
         consolidation,  merger or  transfer of assets  that  complies  with the
         provisions of the Indentures applicable to mergers,  consolidations and
         transfers of all or substantially all of the property and assets of the
         Company;

                  (vi)  the  repurchase,  redemption  or  other  acquisition  of
         outstanding  shares of Series A  Preferred  Stock or Series B Preferred
         Stock,  which shares either (A) were outstanding on the Closing Date or
         (B) are shares of Series A Preferred  Stock which were issued  pursuant
         to the exercise of options that were  outstanding  on the Closing 


<PAGE>

         Date,  in  exchange  for,  or out of the  proceeds  of, an  issuance of
         Indebtedness Incurred under clause (ix) of the second paragraph of part
         (a) of Section 4.03; or

                  (vii)  Investments to the extent the amount invested  consists
         solely of Net Cash Proceeds  received by the Company or any  Guarantor,
         within six months of the making of such  Investment,  from the issuance
         and sale  permitted by the  Indentures of its Capital Stock (other than
         Disqualified  Stock) to a Person who is not a Subsidiary of the Company
         or any Guarantor;

                  (viii)  Investments,  the sum of  which  does  not  exceed  $5
         million at any one time outstanding;

                  (ix) cash payments,  not to exceed $3 million,  in lieu of the
         issuance of fractional  shares of Capital Stock of the Company upon the
         exercise  of the  Warrants  or any other  warrants  to buy, or upon the
         conversion of any  securities  convertible  into,  Capital Stock of the
         Company; and

                  (x) a  one-time  cash  payment  of up to $3.0  million  to the
         holders of the Junior Subordinated Convertible Debentures in connection
         with the disposition of the Junior Subordinated  Convertible Debentures
         in an  underwritten  public  offering  pursuant to Section  11.4 of the
         Debenture Purchase Agreement;

provided that,  except in the case of clauses (i) and (iii), no Default or Event
of Default shall have  occurred and be  continuing or occur as a consequence  of
the actions or payments set forth therein.

                  Each Restricted  Payment  permitted  pursuant to the preceding
paragraph (other than the Restricted  Payment referred to in clause (ii) thereof
and an exchange of Capital Stock for Capital Stock or  Indebtedness  referred to
in clause (iii) or (iv)  thereof) and the Net Cash Proceeds from any issuance of
Capital  Stock  referred  to in  clauses  (iii) and (iv)  shall be  included  in
calculating  whether the conditions of clause (C) of the first paragraph of this
Section 4.04 have been met with respect to any subsequent  Restricted  Payments.
In the event the  proceeds of an  issuance  of Capital  Stock of the Company are
used for the  redemption,  repurchase  or other  acquisition  of the  Notes,  or
Indebtedness  that is pari passu with the Notes,  then the Net Cash  Proceeds of
such  issuance  shall be included in clause (C) of the first  paragraph  of this
Section 4.04 only to the extent such proceeds are not,  within six months,  used
for such  redemption,  repurchase  or other  acquisition  of  Indebtedness.  Any
Restricted  Payments  made  other  than in cash  shall be valued at fair  market
value. The amount of any Investment "outstanding" at any time shall be deemed to
be equal to the amount of such  Investment on the date made,  less the return of
capital to the  Company and its  Restricted  Subsidiaries  with  respect to such
Investment (up to the amount of such Investment on the date made).

                  SECTION  4.05.   Limitation  on  Dividend  and  Other  Payment
Restrictions Affecting Restricted  Subsidiaries . The Company will not, and will
not permit any Restricted  Subsidiary to, create or otherwise cause or suffer to
exist or become effective any consensual  


<PAGE>

encumbrance  or  restriction  of any  kind  on  the  ability  of any  Restricted
Subsidiary  to (i) pay  dividends or make any other  distributions  permitted by
applicable law on any Capital Stock of such Restricted  Subsidiary  owned by the
Company or any other Restricted  Subsidiary,  (ii) pay any Indebtedness  owed to
the Company or any other Restricted Subsidiary,  (iii) make loans or advances to
the  Company or any other  Restricted  Subsidiary  or (iv)  transfer  any of its
property or assets to the Company or any other Restricted Subsidiary.

                  The foregoing  provisions  shall not restrict any encumbrances
or restrictions:

                  (i)  existing on the  Closing  Date in this  Indenture  or any
         other  agreements  in effect on the Closing Date,  and any  extensions,
         refinancings,  renewals or  replacements of such  agreements;  provided
         that  the   encumbrances  and  restrictions  in  any  such  extensions,
         refinancings,  renewals or  replacements  are no less  favorable in any
         material respect to the Holders than those encumbrances or restrictions
         that  are then in  effect  and that  are  being  extended,  refinanced,
         renewed or replaced;

                  (ii)     existing under or by reason of applicable law;

                  (iii)  existing  with respect to any Person or the property or
         assets  of  such  Person  acquired  by the  Company  or any  Restricted
         Subsidiary  and  existing  at  the  time  of  such  acquisition,  which
         encumbrances  or  restrictions  are not applicable to any Person or the
         property or assets of any Person other than such Person or the property
         or assets of such Person so acquired;

                  (iv) in the case of clause (iv) of the first paragraph of this
         Section 4.05, (A) that restrict in a customary  manner the  subletting,
         assignment  or  transfer  of any  property  or  asset  that is a lease,
         license,  conveyance  or  contract or similar  property  or asset,  (B)
         existing by virtue of any transfer of, agreement to transfer, option or
         right  with  respect  to,  or Lien on,  any  property  or assets of the
         Company or any Restricted  Subsidiary not otherwise  prohibited by this
         Indenture  or (C)  arising  or  agreed  to in the  ordinary  course  of
         business,   not  relating  to  any  Indebtedness,   and  that  do  not,
         individually or in the aggregate, detract from the value of property or
         assets  of the  Company  or any  Restricted  Subsidiary  in any  manner
         material to the Company or any Restricted Subsidiary; or

                  (v)  with  respect  to a  Restricted  Subsidiary  and  imposed
         pursuant to an  agreement  that has been  entered  into for the sale or
         disposition  of all or  substantially  all of the Capital  Stock of, or
         property and assets of, such Restricted  Subsidiary.  Nothing contained
         in this  Section  4.05 shall  prevent  the  Company  or any  Restricted
         Subsidiary from (1) creating, incurring, assuming or suffering to exist
         any Liens  otherwise  permitted in Section 4.09 or (2)  restricting the
         sale or other  disposition  of property or assets of the Company or any
         of its Restricted  Subsidiaries that secure Indebtedness of the Company
         or any of its Restricted Subsidiaries.
<PAGE>

                  SECTION  4.06.  Limitation on the Issuance of Capital Stock of
Restricted  Subsidiaries  . The Company  will not sell,  and will not permit any
Restricted Subsidiary,  directly or indirectly,  to issue or sell, any shares of
Capital Stock of a Restricted Subsidiary  (including options,  warrants or other
rights to purchase shares of such Capital Stock) except:

                  (i) to the Company or a Wholly Owned Restricted Subsidiary;

                  (ii)  issuances of  director's  qualifying  shares or sales to
         foreign  nationals  of shares of Capital  Stock of  foreign  Restricted
         Subsidiaries, to the extent required by applicable law;

                  (iii) if,  immediately after giving effect to such issuance or
         sale,  such  Restricted   Subsidiary  would  no  longer   constitute  a
         Restricted Subsidiary, provided any Investment in such Person remaining
         after giving effect to such issuance or sale would have been  permitted
         to be made under  Section 4.04, if made on the date of such issuance or
         sale; and

                  (iv)  issuances  or sales of  Common  Stock of any  Restricted
         Subsidiary,  the Net  Cash  Proceeds  of  which  are  promptly  applied
         pursuant  to  clause  (A) or (B) of  Section  4.11 of  this  Indenture;
         provided that at no time may a Restricted Subsidiary,  the Common Stock
         of which has been issued or sold  pursuant to this clause (iv),  be the
         owner of a satellite.

                  SECTION  4.07.   Limitation  on  Issuances  of  Guarantees  by
Restricted Subsidiaries . The Company will not permit any Restricted Subsidiary,
directly or indirectly,  to Guarantee any  Indebtedness  of the Company which is
pari passu  with or  subordinate  in right of payment to the Notes  ("Guaranteed
Indebtedness"),  unless such  Restricted  Subsidiary  waives and will not in any
manner  whatsoever  claim or take the  benefit  or  advantage  of, any rights of
reimbursement,  indemnity or subrogation or any other rights against the Company
or any other Restricted Subsidiary as a result of any payment by such Restricted
Subsidiary  under its Subsidiary  Guarantee;  provided that this paragraph shall
not be applicable to any Guarantee of any Restricted  Subsidiary that existed at
the time such Person  became a  Restricted  Subsidiary  and was not  Incurred in
connection  with,  or in  contemplation  of, such Person  becoming a  Restricted
Subsidiary.  If the Guaranteed  Indebtedness is (A) pari passu with the Notes or
the Note Guarantee,  then the Guarantee of such Guaranteed Indebtedness shall be
pari  passu  with,  or  subordinated   to,  the  Subsidiary   Guarantee  or  (B)
subordinated  to the Notes or the Note  Guarantee,  then the  Guarantee  of such
Guaranteed  Indebtedness  shall be subordinated  to the Subsidiary  Guarantee at
least to the extent that the  Guaranteed  Indebtedness  is  subordinated  to the
Notes or the Note Guarantee, as the case may be.

                  SECTION 4.08. Limitation on Transactions with Shareholders and
Affiliates . The Company will not, and will not permit any Restricted Subsidiary
to,  directly  or  indirectly,  enter  into,  renew or  extend  any  transaction
(including,  without  limitation,  the  purchase,  sale,  lease or  exchange  of
property or assets,  or the  rendering of any  service)  with any holder (or any
Affiliate  of such  holder) of 5% or more of any class of  Capital  Stock of the
Company  or with 


<PAGE>

any Affiliate of the Company or any Restricted Subsidiary,  except upon fair and
reasonable terms no less favorable to the Company or such Restricted  Subsidiary
than could be obtained,  at the time of such transaction or, if such transaction
is  pursuant  to a  written  agreement,  at the  time  of the  execution  of the
agreement providing therefor,  in a comparable  arm's-length  transaction with a
Person that is not such a holder or an Affiliate.

   The  foregoing  limitation  does  not  limit,  and  shall  not  apply  to (i)
transactions  (A)  approved  by a majority of the  disinterested  members of the
Board of  Directors  or (B) for which the  Company  or a  Restricted  Subsidiary
delivers to the Trustees a written opinion of a nationally recognized investment
banking  firm  stating  that  the  transaction  is fair to the  Company  or such
Restricted  Subsidiary  from a  financial  point of view,  (ii) any  transaction
solely between the Company and any of its Wholly Owned  Restricted  Subsidiaries
or solely between  Wholly Owned  Restricted  Subsidiaries,  (iii) the payment of
reasonable  and  customary  regular fees to directors of the Company who are not
employees of the Company,  (iv) any payments or other  transactions  pursuant to
any  tax-sharing  agreement  between the Company and any other Person with which
the Company files a consolidated tax return or with which the Company is part of
a  consolidated  group  for  tax  purposes,  (v)  any  Restricted  Payments  not
prohibited by Section 4.04 or (vii) Kingston's and Matra's rights to commissions
and other  payments  under sales  representation  agreements;  Matra's rights to
payments,  including without limitation  incentive  payments,  under the Orion 1
Satellite  Contract and Orion 2 Satellite  Contract;  and  Kingston's  rights to
payments for services  under network  monitoring  contracts,  in each case as in
effect on the Closing  Date and with such  extensions,  amendments  and renewals
that may be entered  into on terms at least as  favorable  to the Company as the
terms  of  agreements  in  effect  on  the  Closing  Date.  Notwithstanding  the
foregoing,  any transaction  covered by the first paragraph of this Section 4.08
and not covered by clauses (ii)  through (v) of this  paragraph,  the  aggregate
amount of which  exceeds $5 million in value,  must be approved or determined to
be fair in the manner provided for in clause (i)(A) or (B) above.

                  SECTION 4.09.  Limitation on Liens . The Company will not, and
will not permit any Restricted Subsidiary to, create, incur, assume or suffer to
exist  any Lien on any of its  assets or  properties  of any  character,  or any
shares of Capital Stock or  Indebtedness of any Restricted  Subsidiary,  without
making effective  provision for all of the Notes and all other amounts due under
the  Indentures  to be directly  secured  equally  and ratably  with (or, if the
obligation or liability to be secured by such Lien is  subordinated  in right of
payment to the Notes,  prior to) the  obligation  or  liability  secured by such
Lien.

                  The foregoing limitation does not apply to:

                  (i)      Liens existing on the Closing Date;

                  (ii) Liens  granted  after the  Closing  Date on any assets or
         Capital Stock of the Company or its Restricted  Subsidiaries created in
         favor of the Holders;
<PAGE>

                  (iii)  Liens  with  respect  to  the  assets  of a  Restricted
         Subsidiary  granted by such  Restricted  Subsidiary to the Company or a
         Wholly Owned Restricted  Subsidiary to secure Indebtedness owing to the
         Company or such other Restricted Subsidiary;

                  (iv)  Liens  securing   Indebtedness   which  is  Incurred  to
         refinance secured  Indebtedness which is permitted to be Incurred under
         clause (iii) of the second  paragraph of Section  4.03;  provided  that
         such  Liens do not  extend  to or cover any  property  or assets of the
         Company or any Restricted  Subsidiary other than the property or assets
         securing the Indebtedness being refinanced; or

                   (v) Permitted Liens.

The Company will not, and will not permit any Restricted  Subsidiary to, create,
incur,  assume or  suffer to exist any Lien on Orion 1,  Orion 2 or Orion 3 that
secures  Indebtedness,  other than pursuant to clause (xxi) of the definition of
Permitted Liens.

                  SECTION 4.10. Limitation on Sale-Leaseback  Transactions . The
Company will not, and will not permit any Restricted  Subsidiary to, directly or
indirectly,  enter  into any  sale-leaseback  transaction  involving  any of its
assets or  properties  whether  now owned or  hereafter  acquired,  whereby  the
Company or a Restricted  Subsidiary sells or transfers such assets or properties
and then or  thereafter  leases such assets or properties or any part thereof or
any other assets or properties which the Company or such Restricted  Subsidiary,
as the  case may be,  intends  to use for  substantially  the  same  purpose  or
purposes as the assets or properties sold or transferred.

                  The foregoing restriction does not apply to any sale-leaseback
transaction if (i) the lease is for a period,  including  renewal rights, of not
in excess of three  years;  (ii) the lease  secures  or  relates  to  industrial
revenue or pollution control bonds;  (iii) the transaction is solely between the
Company and any Wholly Owned  Restricted  Subsidiary  or solely  between  Wholly
Owned  Restricted   Subsidiaries;   or  (iv)  the  Company  or  such  Restricted
Subsidiary,  within  twelve  months  after the sale or transfer of any assets or
properties  is  completed,  applies  an amount  not less  than the net  proceeds
received  from  such  sale in  accordance  with  clause  (A) or (B) of the first
paragraph of Section 4.11 of this Indenture.

                  SECTION 4.11. Limitation on Asset Sales. The Company will not,
and will not permit any  Restricted  Subsidiary  to,  consummate  any Asset Sale
unless  (i)  the  consideration  received  by the  Company  or  such  Restricted
Subsidiary (including the amount of any Released Indebtedness) is at least equal
to the fair market value of the assets sold or disposed of and (ii) at least 85%
of  the   consideration   received   (excluding   the  amount  of  any  Released
Indebtedness)  consists of cash or Temporary Cash Investments.  In the event and
to the extent that the Net Cash  Proceeds  received by the Company or any of its
Restricted  Subsidiaries  from one or more Asset Sales occurring on or after the
Closing  Date in any period of 12  consecutive  months  exceed  10% of  Adjusted
Consolidated  Net  Tangible  Assets  (determined  as of the date  closest to the
commencement of such 12-month  period for which a consolidated  balance sheet of
the Company and its  subsidiaries  has been filed pursuant to Section 4.18, then
the  Company  shall or shall


<PAGE>

cause the relevant  Restricted  Subsidiary to (i) within twelve months after the
date Net Cash  Proceeds so  received  exceed 10% of  Adjusted  Consolidated  Net
Tangible  Assets (A) apply an amount  equal to such excess Net Cash  Proceeds to
permanently repay  unsubordinated  Indebtedness of the Company or any Restricted
Subsidiary  owing to a Person  other than the  Company or any of its  Restricted
Subsidiaries  or (B)  invest  an equal  amount,  or the  amount  not so  applied
pursuant to clause (A) (or enter into a definitive  agreement  committing  to so
invest within twelve  months after the date of such  agreement),  in property or
assets  (other  than  current  assets) of a nature or type or that are used in a
business (or in a company  having  property  and assets of a nature or type,  or
engaged in a business)  similar or related to the nature or type of the property
and assets of, or the business of, the Company and its  Restricted  Subsidiaries
existing on the date of such investment and (ii) apply (no later than the end of
the twelve-month period referred to in clause (i)) such excess Net Cash Proceeds
(to the extent not applied  pursuant to clause (i)) as provided in the following
paragraph  of this  Section  4.11.  The amount of such excess Net Cash  Proceeds
required  to  be  applied  (or  to  be  committed  to be  applied)  during  such
twelve-month period as set forth in clause (i) of the preceding sentence and not
applied  as so  required  by the end of such  period  shall  constitute  "Excess
Proceeds."

                  If, as of the first day of any calendar  month,  the aggregate
amount  of Excess  Proceeds  not  theretofore  subject  to an Offer to  Purchase
pursuant to this  Section  4.11 totals at least $10  million,  the Company  must
commence,  not  later  than  the  fifteenth  Business  Day of  such  month,  and
consummate  an  Offer  to  Purchase  from the  Holders  on a pro  rata  basis an
aggregate principal amount Notes equal to the Excess Proceeds on such date, at a
purchase price equal to 101% of the principal amount of the Notes plus,  accrued
interest (if any) to the Payment Date.

                  SECTION  4.12.  Maintenance  of Office or Agency . The Company
will  maintain  an  office or agency  where  the  Notes may be  surrendered  for
registration of transfer or exchange or for  presentation  for payment and where
notices and demands to or upon the Company in respect of the Securities and this
Indenture  may be served.  The Company  will give prompt  written  notice to the
Trustee of the  location,  and any  change in the  location,  of such  office or
agency.  If at any time the  Company  shall fail to maintain  any such  required
office or agency or shall fail to furnish the Trustee with the address  thereof,
such presentations, surrenders, notices and demands may be made or served at the
address of the Trustee set forth in Section 12.02.

                  The Company may also from time to time  designate  one or more
other offices or agencies  where the Notes may be presented or  surrendered  for
any or all such  purposes and may from time to time  rescind such  designations.
The  Company  shall  give  prompt  written  notice  to the  Trustee  of any such
designation  or  rescission  and of any change in the location of any such other
office or agency.

                  The Company hereby  initially  designates the Corporate  Trust
Office of the Trustee as such office of the Company in  accordance  with Section
2.03.
<PAGE>

                  SECTION  4.13.  Repurchase of Notes upon a Change of Control .
The Company  shall  commence,  within 30 days of the  occurrence  of a Change of
Control, and consummate an Offer to Purchase for all Notes then outstanding,  at
a purchase price equal to 101% of the principal amount of the Notes plus accrued
interest (if any) to the Payment Date.

                  SECTION 4.14. Existence . Subject to Articles Four and Five of
this Indenture,  the Company will do or cause to be done all things necessary to
preserve and keep in full force and effect its  existence  and the  existence of
each  Restricted  Subsidiary in accordance  with the  respective  organizational
documents  of the Company  and each such  Restricted  Subsidiary  and the rights
(whether pursuant to charter,  partnership  certificate,  agreement,  statute or
otherwise),  material  licenses  and  franchises  of the  Company  and each such
Restricted  Subsidiary,  provided  that the  Company  shall not be  required  to
preserve  any  such  right,  license  or  franchise,  or  the  existence  of any
Restricted  Subsidiary  (other  than  of the  Company),  if the  maintenance  or
preservation  thereof is no longer  desirable  in the conduct of the business of
the Company and its Restricted Subsidiaries taken as a whole.

                  SECTION 4.15.  Payment of Taxes and Other Claims . The Company
will pay or  discharge  and shall  cause each  Restricted  Subsidiary  to pay or
discharge,  or cause to be paid or  discharged,  before  the same  shall  become
delinquent (i) all material taxes,  assessments and governmental  charges levied
or imposed  upon (a) the  Company  or any such  Restricted  Subsidiary,  (b) the
income or profits of any such  Restricted  Subsidiary  which is a corporation or
(c) the property of the Company or any such  Restricted  Subsidiary and (ii) all
material lawful claims for labor,  materials and supplies that, if unpaid, might
by law become a Lien upon the  property  of the  Company or any such  Restricted
Subsidiary, provided that the Company shall not be required to pay or discharge,
or cause to be paid or discharged, any such tax, assessment, charge or claim the
amount,  applicability  or validity of which is being contested in good faith by
appropriate  proceedings or by the Company and its Restricted Subsidiaries where
the failure to effect such payment is not adverse in any material respect to the
Holders.

                  SECTION 4.16.  Maintenance  of Properties  and Insurance . The
Company  will  maintain  (a)  in-orbit  insurance  with respect to Orion 1 in an
amount at least equal to the cost to replace such  satellite with a satellite of
comparable or superior  technological  capability  (as estimated by the Board of
Directors) and having at least as much transmission  capacity as such satellite,
and (b) with respect to Orion 2, Orion 3, each other satellite to be launched by
the  Company  or  any  Restricted  Subsidiary  and  each  replacement  satellite
therefor,  (i) launch insurance with respect to each such satellite covering the
period from the launch of such satellite to 180 days following such launch in an
amount  equal  to or  greater  than  the sum of (A) the  cost  to  replace  such
satellite  pursuant to the contract  pursuant to which a  replacement  satellite
will be constructed,  (B) the cost to launch a replacement satellite pursuant to
the contract pursuant to which a replacement  satellite will be launched and (C)
the cost of launch  insurance  for such  satellite  or,  in the  event  that the
Company has reason to believe  that the cost of obtaining  comparable  insurance
for a replacement  satellite  would be  materially  higher,  the Company's  best
estimate  of the  cost of  such  comparable  insurance  and  (ii)  at all  times
subsequent  to 180 days after the launch (if it is a Successful  Launch) of each
such  satellite,  in-orbit  insurance in an amount at least equal to the cost to
replace such satellite with a satellite of comparable or 


<PAGE>

superior  technological  capability (as estimated by the Board of Directors) and
having at least as much transmission  capacity as such satellite was designed to
have. The in-orbit insurance required by this Section 4.16 shall provide that if
50% or more of a  satellite's  initial  capacity  is lost,  the full  amount  of
insurance  will  become  due and  payable,  and that if a  satellite  is able to
maintain  more than 50% but less than 90% of its  initial  capacity,  a pro-rata
portion of such insurance will become due and payable. The insurance required by
this  paragraph  shall name the Company  and/or any  Guarantor  as the sole loss
payee or payees, as the case may be, thereof.

                  In the  event  that  the  Company  (or a  Guarantor)  receives
proceeds from insurance relating to any satellite,  the Company (or a Guarantor)
may use a portion of such proceeds to repay any vendor or  third-party  purchase
money  financing  pertaining  to such  satellite  (other  than  Orion 1) that is
required  to be  repaid  by reason  of the loss  giving  rise to such  insurance
proceeds. The Company (or a Guarantor) may use the remainder of such proceeds to
develop,  construct,  launch  and  insure  a  replacement  satellite  (including
components for a related ground spare) if (i) such  replacement  satellite is of
comparable or superior  technological  capability as compared with the satellite
being replaced and has at least as much  transmission  capacity as the satellite
being  replaced and (ii) the Company will have  sufficient  funds to service the
Company's projected debt service requirements until the scheduled launch of such
replacement  satellite and for one year  thereafter  and to develop,  construct,
launch and insure (in the amounts  required  by the  preceding  paragraph)  such
replacement satellite,  provided that such replacement satellite is scheduled to
be launched within 15 months of the receipt of such proceeds.  Any such proceeds
not used as permitted by this Section 4.16 shall be applied,  within 90 days, to
reduce  Indebtedness of the Company or shall  constitute  "Excess  Proceeds" for
purposes of Section 4.11.

                  The Company will further provide or cause to be provided,  for
itself  and  its  Restricted  Subsidiaries,   insurance  (including  appropriate
self-insurance) against loss or damage of the kinds considered reasonable by the
Company in the conduct of its business.

                  The Company will cause all properties  owned by the Company or
any  Subsidiary  or used or held for use in the  conduct of its  business or the
business of any Subsidiary to be maintained and kept in good  condition,  repair
and working order and supplied with all necessary equipment and will cause to be
made all necessary repairs, renewals, replacements, betterments and improvements
thereof,  all as in the  judgment of the Company  may be  necessary  so that the
business carried on in connection  therewith may be properly and  advantageously
conducted  at all times;  provided,  however,  that nothing in this Section 4.16
shall  prevent the Company from  discontinuing  the  maintenance  of any of such
properties if such discontinuance is, in the judgment of the Company,  desirable
in the  conduct  of its  business  or the  business  of any  Subsidiary  and not
disadvantageous in any material respect to the Holders.

                  SECTION  4.17.  Notice of  Defaults  . In the  event  that the
Company becomes aware of any Default or Event of Default, the Company,  promptly
after it becomes aware thereof, will give written notice thereof to the Trustee.
<PAGE>

                  SECTION  4.18.  Commission  Reports  and  Reports to Holders .
Whether or not the Company is required to file reports with the Commission,  the
Company shall file with the Commission all such reports and other information as
it would be required  to file with the  Commission  by  Sections  13(a) or 15(d)
under the Notes  Exchange  Act of 1934 if it were subject  thereto.  The Company
shall  supply the  Trustees  and each Holder or shall supply to the Trustees for
forwarding  to each such Holder,  without  cost to such  Holder,  copies of such
reports and other information.

                  SECTION  4.19.  Waiver of Stay,  Extension or Usury Laws . The
Company  covenants  (to the extent that it may lawfully do so) that it shall not
at any time insist upon, or plead, or in any manner whatsoever claim or take the
benefit or advantage of, any stay or extension law or any usury law or other law
that would prohibit or forgive the Company from paying all or any portion of the
principal of, premium, if any, or interest on the Notes as contemplated  herein,
wherever enacted,  now or at any time hereafter in force, or that may affect the
covenants or the performance of this  Indenture,  and (to the extent that it may
lawfully do so) the Company hereby  expressly waives all benefit or advantage of
any such  law and  covenants  that it will  not  hinder,  delay  or  impede  the
execution  of any power  herein  granted to the  Trustee,  but shall  suffer and
permit the execution of every such power as though no such law had been enacted.


                                  ARTICLE FIVE
                              SUCCESSOR CORPORATION

                  SECTION 5.01. Consolidation,  Merger and Sale of Assets . Each
of the Company and each Guarantor will not consolidate with, merge with or into,
or sell,  convey,  transfer,  lease or otherwise dispose of all or substantially
all of its property and assets (as an entirety or  substantially  an entirety in
one  transaction or a series of related  transactions)  to, any Person or permit
any Person to merge with or into the Company or any Guarantor unless:

                  (i) the Company or any Guarantor, as the case may be, shall be
         the  continuing  Person,  or the Person  (if other than the  Company or
         Guarantor)  formed by such  consolidation  or into which the Company or
         any Guarantor, as the case may be, is merged or that acquired or leased
         such property and assets of the Company or any  Guarantor,  as the case
         may be, shall be a corporation organized and validly existing under the
         laws of the United  States of America or any  jurisdiction  thereof and
         shall  expressly  assume,  by a  supplemental  indenture,  executed and
         delivered to the Trustees, all of the obligations of the Company or any
         Guarantor,  as the case  may be,  on all of the  Notes  and  under  the
         Indenture;

                  (ii) immediately after giving effect to such  transaction,  no
         Default or Event of Default shall have occurred and be continuing;

                  (iii)  if  such  transaction   involves  the  Company  or  any
         Significant Subsidiary thereof, immediately after giving effect to such
         transaction on a pro forma basis,  the 


<PAGE>

         Company, or any Person becoming the successor to the Company as obligor
         on the Notes  shall have a  Consolidated  Net Worth equal to or greater
         than the  Consolidated  Net Worth of the Company  immediately  prior to
         such transaction;

                  (iv)  if  such   transaction   involves  the  Company  or  any
         Significant Subsidiary thereof, immediately after giving effect to such
         transaction on a pro forma basis,  the Company,  or any Person becoming
         the successor  obligor of the Notes, as the case may be, could Incur at
         least $1.00 of Indebtedness  under the first paragraph of Section 4.03;
         provided  that this clause (iv) shall not apply to a  consolidation  or
         merger  with  or  into a  Wholly  Owned  Restricted  Subsidiary  with a
         positive net worth;  provided that, in connection  with any such merger
         or  consolidation,  no  consideration  (other than Common  Stock in the
         surviving  Person or the Company) shall be issued or distributed to the
         stockholders of the Company; and

                  (v) the Company or Guarantor,  as the case may be, delivers to
         the  Trustees  an  Officers'  Certificate   (attaching  the  arithmetic
         computations to demonstrate compliance with clauses (iii) and (iv)) and
         Opinion  of  Counsel,  in each case  stating  that such  consolidation,
         merger or transfer and such supplemental  indenture  complies with this
         provision  and  that  all  conditions  precedent  provided  for  herein
         relating  to  such  transaction  have  been  complied  with;  provided,
         however, that clauses (iii) and (iv) above do not apply if, in the good
         faith  determination  of the Board of Directors  of the Company,  whose
         determination  shall be evidenced by a Board Resolution,  the principal
         purpose of such  transaction is to change the state of incorporation of
         the Company;  and provided further that any such transaction  shall not
         have as one of its purposes the evasion of the foregoing limitations.

                  Notwithstanding the foregoing,  the provisions of this Section
         5.01 shall not apply to the Merger.

                  SECTION 5.02.  Successor  Substituted . Upon any consolidation
or merger,  or any sale,  conveyance,  transfer or other  disposition  of all or
substantially  all of the property and assets of the Company in accordance  with
Section  5.01  of  this   Indenture,   the  successor   Person  formed  by  such
consolidation  or into  which  the  Company  is merged  or to which  such  sale,
conveyance,  transfer  or other  disposition  is made shall  succeed  to, and be
substituted  for, and may exercise  every right and power of, the Company  under
this Indenture  with the same effect as if such successor  Person had been named
as the  Company  herein  and  thereafter,  except  in the case of a  lease,  the
predecessor Person shall be relieved of all obligations and covenants under this
Indenture and the Notes.
<PAGE>


                                   ARTICLE SIX
                              DEFAULT AND REMEDIES

                  SECTION 6.01.  Events of Default . An "Event of Default" shall
occur with respect to the Notes if:

                  (a) default in the payment of  principal  of (or  premium,  if
         any,  on) any Note when the same  becomes due and payable at  maturity,
         upon acceleration, redemption or otherwise;

                  (b)  default in the  payment of  interest on any Note when the
         same becomes due and payable,  and such default  continues for a period
         of 30  days;  provided  that a  failure  to make any of the  first  six
         scheduled  interest  payments  on the  Notes  in a timely  manner  will
         constitute an Event of Default with no grace or cure period;

                  (c) default in the  performance  or breach of Section  5.01 or
         the failure to make or  consummate  an Offer to Purchase in  accordance
         with Section 4.11 or Section 4.13;

                  (d) the Company defaults in the performance of or breaches any
         other  covenant or agreement of the Company in this  Indenture or under
         the Notes  (other than a default  specified  in clause (a),  (b) or (c)
         above)  and  such  default  or  breach  continues  for a  period  of 30
         consecutive  days after written notice by the Trustee or the Holders of
         25% or more in aggregate principal amount at maturity of the Notes;

                  (e) there  occurs  with  respect to (A) any issue or issues of
         Indebtedness   of  the  Company,   any  Guarantor  or  any  Significant
         Subsidiary  having an  outstanding  principal  amount of $10 million or
         more in the aggregate for all such issues of all such Persons,  whether
         such  Indebtedness  now exists or shall hereafter be created or (B) the
         TT&C  Financing  or  any  refinancing   thereof  which  is  secured  by
         substantially  the same  collateral,  (I) an event of default  that has
         caused the holder  thereof to declare such  Indebtedness  to be due and
         payable prior to its Stated Maturity and such Indebtedness has not been
         discharged  in full or such  acceleration  has not  been  rescinded  or
         annulled within 30 days of such acceleration and/or (II) the failure to
         make a  principal  payment  at the final  (but not any  interim)  fixed
         maturity and such defaulted payment shall not have been made, waived or
         extended within 30 days of such payment default;

                  (f) any final judgment or order (not covered by insurance) for
         the payment of money in excess of $10 million in the  aggregate for all
         such final  judgments or orders against all such Persons  (treating any
         deductibles,  self-insurance  or retention as not so covered)  shall be
         rendered  against  the  Company,   any  Guarantor  or  any  Significant
         Subsidiary and shall not be paid or discharged,  and there shall be any
         period of 30 consecutive  days following entry of the final judgment or
         order that causes the aggregate  amount for all such final judgments or
         orders  outstanding and not paid or discharged against all such Persons
         to exceed $10 million  during which a stay of enforcement of 


<PAGE>

         such  final  judgment  or  order,  by  reason  of a  pending  appeal or
         otherwise, shall not be in effect;

                  (g) a court  having  jurisdiction  in the  premises  enters  a
         decree or order for (A) relief in respect of the Company, any Guarantor
         or  any  Significant  Subsidiary  in  an  involuntary  case  under  any
         applicable bankruptcy, insolvency or other similar law now or hereafter
         in  effect,  (B)  appointment  of  a  receiver,  liquidator,  assignee,
         custodian,  trustee,  sequestrator or similar  official of the Company,
         any Guarantor or any Significant Subsidiary or for all or substantially
         all of the  property and assets of the  Company,  any  Guarantor or any
         Significant  Subsidiary  or (C) the  winding up or  liquidation  of the
         affairs of the Company or any Significant Subsidiary and, in each case,
         such decree or order shall  remain  unstayed and in effect for a period
         of 30 consecutive days;

                  (h) the Company,  any Guarantor or any Significant  Subsidiary
         (A)  commences  a  voluntary  case  under  any  applicable  bankruptcy,
         insolvency or other similar law now or hereafter in effect, or consents
         to the entry of an order for  relief in an  involuntary  case under any
         such law, (B) consents to the appointment of or taking  possession by a
         receiver,  liquidator,  assignee,  custodian,  trustee, sequestrator or
         similar  official of the  Company,  any  Guarantor  or any  Significant
         Subsidiary or for all or  substantially  all of the property and assets
         of the Company,  any  Guarantor or any  Significant  Subsidiary  or (C)
         effects any general assignment for the benefit of creditors;

                  (i) the Note Guarantee shall cease to be, or shall be asserted
in writing by the Company or any  Guarantor  not to be, in full force and effect
or enforceable in accordance with their respective  terms; or (j) the occurrence
of an "Event of Default"  described in paragraph  (i), (j), (k), (l), (m) or (n)
of Section 18.1 of the Debenture Purchase Agreement.

                  SECTION  6.02.  Acceleration  . If an Event of Default  (other
than an Event of Default  specified  in clause (g) or (h) above that occurs with
respect  to the  Company)  occurs and is  continuing  under the  Indenture,  the
Trustee or the Holders of at least 25% in aggregate principal amount at maturity
of the Notes,  then  outstanding,  by written  notice to the Company (and to the
Trustee if such  notice is given by the  Holders),  may,  and the Trustee at the
request of such Holders shall, declare the principal amount of, premium, if any,
and accrued  interest on the Notes to be  immediately  due and  payable.  Upon a
declaration of  acceleration,  such principal  amount of,  premium,  if any, and
accrued  interest  shall  be  immediately  due and  payable.  In the  event of a
declaration of acceleration  because an Event of Default set forth in clause (e)
above has occurred and is continuing,  such declaration of acceleration shall be
automatically  rescinded  and annulled if the event of default  triggering  such
Event of  Default  pursuant  to  clause  (e) shall be  remedied  or cured by the
Guarantor,  the Company or the relevant Significant  Subsidiary or waived by the
holders of the relevant  Indebtedness  within 60 days after the  declaration  of
acceleration  with respect thereto.  If an Event of Default  specified in clause
(g) or (h) above  occurs  with  respect to the  Guarantor  or the  Company,  the
principal  amount of,  premium,  if any, and accrued  interest on the Notes then
outstanding  shall ipso facto become and be immediately  due and payable without
any declaration or other act on the part of the Trustee or any Holder.
<PAGE>

                  SECTION 6.03.  Other  Remedies . If an Event of Default occurs
and is continuing,  the Trustee may pursue any available remedy by proceeding at
law or in equity to  collect  the  payment of  principal  of,  premium,  if any,
interest  on the Notes or to enforce the  performance  of any  provision  of the
Notes, the Pledge Agreement or this Indenture.

                  The  Trustee  may  maintain a  proceeding  even if it does not
possess any of the Notes or does not produce any of them in the proceeding.

                  SECTION  6.04.  Waiver of Past  Defaults  . Subject to Section
9.02, at any time after a declaration of acceleration,  but before a judgment or
decree for the payment of the money due has been  obtained by the  Trustee,  the
Holders of at least a majority in principal  amount of the outstanding  Notes at
Maturity,  by notice to the Trustee,  may waive all past  Defaults and Events of
Default and rescind and annul a declaration of acceleration (except a Default in
the payment of principal of, premium,  if any, interest on any Note as specified
in clause (a) or (b) of Section 6.01 (but not as a result of such  acceleration)
or in respect of a covenant  or  provision  of this  Indenture  which  cannot be
modified or amended without the consent of the holder of each  outstanding  Note
affected)  if all  existing  Events of  Default,  other than the  nonpayment  of
principal of, premium, if any, interest on the Notes that have become due solely
by  such  declaration  of  acceleration,  have  been  cured  or  waived  and the
rescission  would  not  conflict  with  any  judgment  or  decree  of a court of
competent jurisdiction. Upon any such waiver, such Default shall cease to exist,
and any Event of Default  arising  therefrom shall be deemed to have been cured,
for every  purpose of this  Indenture;  but no such waiver  shall  extend to any
subsequent or other  Default or Event of Default or impair any right  consequent
thereto.

                  SECTION 6.05.  Control by Majority . The Holders of at least a
majority in aggregate  principal amount at maturity of the outstanding Notes may
direct the time,  method and place of conducting  any  proceeding for any remedy
available  to the  Trustee or  exercising  any trust or power  conferred  on the
Trustee.  However, the Trustee may refuse to follow any direction that conflicts
with law or this Indenture,  that may involve the Trustee in personal liability,
or that the Trustee  determines in good faith may be unduly  prejudicial  to the
rights of Holders of Notes not joining in the giving of such  direction  and may
take any other  action it deems  proper that is not  inconsistent  with any such
direction received from Holders of Notes.

                  SECTION  6.06.  Limitation  on Suits . A Holder may not pursue
any remedy with respect to the Indenture or the Notes unless:

                  (i)  the  Holder  gives  the  Trustee   written  notice  of  a
         continuing Event of Default;

                  (ii) the Holders of at least 25% in aggregate principal amount
         at maturity of outstanding  Notes make a written request to the Trustee
         to pursue the remedy;

                  (iii)  such  Holder or  Holders  offer the  Trustee  indemnity
         satisfactory to the Trustee against any costs, liability or expense;
<PAGE>

                  (iv) the Trustee  does not comply  with the request  within 60
         days after receipt of the request and the offer of indemnity; and

                  (v) during  such 60-day  period,  the Holders of a majority in
         aggregate  principal amount at maturity of the outstanding Notes do not
         give the Trustee a direction that is inconsistent with the request.

                  SECTION 6.07.  Rights of Holders to Receive  Payment . Subject
to  Sections  6.04  and  9.02,  notwithstanding  any  other  provision  of  this
Indenture, the right of any Holder of a Note to receive payment of principal of,
premium,  if any, or interest on, such Note or to bring suit for the enforcement
of any such  payment or after the due date  expressed  in the Notes shall not be
impaired or affected without the consent of such Holder provided,  however, that
no recourse for the payment of the principal of, premium, if any, or interest on
any of the Notes or for any claim based thereon or otherwise in respect thereof,
and no  recourse  under or upon any  obligation,  covenant or  agreement  of the
Company  in the  Indentures,  the  Pledge  Agreement  or in any of the  Notes or
because of the creation of any Indebtedness  represented  thereby,  shall be had
against  any  incorporator,   stockholder,   officer,   director,   employee  or
controlling  person of the  Company or of any  successor  Person  thereof.  Each
Holder, by accepting the Notes, waives and releases all such liability.

                  SECTION  6.08.   Collection  of  Indebtedness  and  Suits  for
Enforcement by Trustee .

                  The Company covenants that if

                  (a)  default  is made in the  payment  of any  installment  of
         interest  on any Note when such  interest  becomes  due and payable and
         such default continues for a period of 30 days, or

                  (b)  default is made in the  payment of the  principal  of (or
         premium, if any, on) any Note at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to the Trustee for the benefit
of the  Holders of such  Notes,  the whole  amount  then due and payable on such
Notes for  principal  (and premium,  if any) and  interest,  and interest on any
overdue principal (and premium,  if any) and, to the extent that payment of such
interest shall be legally enforceable, upon any overdue installment of interest,
at the rate borne by the Notes, and, in addition thereto, such further amount as
shall be sufficient to cover the costs and expenses of collection, including the
reasonable  compensation,  expenses,  disbursements and advances of the Trustee,
its agents and counsel.

                  If the Company fails to pay such amounts  forthwith  upon such
demand,  the  Trustee,  in its own name as  trustee  of an  express  trust,  may
institute  a  judicial  proceeding  for the  collection  of the  sums so due and
unpaid,  may  prosecute  such  proceeding  to judgment  or final  decree and may
enforce the same  against the  Company or any other  obligor  upon the Notes 


<PAGE>

and collect the moneys  adjudged or decreed to be payable in the manner provided
by law out of the  property of the Company or any other  obligor upon the Notes,
wherever situated.

                  If an Event of Default occurs and is  continuing,  the Trustee
may in its  discretion  proceed to protect and enforce its rights and the rights
of the Holders by such  appropriate  judicial  proceedings  as the Trustee shall
deem most  effectual  to protect and enforce  any such  rights,  whether for the
specific enforcement of any covenant or agreement in this Indenture or in aid of
the exercise of any power granted herein, or to enforce any other proper remedy.

                  SECTION  6.09.  Trustee  May File Proofs of Claim . In case of
the  pendency  of  any  receivership,   insolvency,   liquidation,   bankruptcy,
reorganization,   arrangement,   adjustment,   composition   or  other  judicial
proceeding  relative to the Company or any other  obligor  upon the Notes or the
property of the Company or of such other obligor or their creditors, the Trustee
(irrespective  of  whether  the  principal  of the Notes  shall  then be due and
payable as therein  expressed or by declaration or otherwise and irrespective of
whether the Trustee shall have made any demand on the Company for the payment of
overdue  principal,  premium,  if  any,  or  interest)  shall  be  entitled  and
empowered, by intervention in such proceeding or otherwise,

                  (i) to file  and  prove  a  claim  for  the  whole  amount  of
         principal  (and  premium,  if any) and  interest  owing  and  unpaid in
         respect of the Notes and to file such other  papers or documents as may
         be  necessary  or  advisable in order to have the claims of the Trustee
         (including  any  claim  for  the  reasonable  compensation,   expenses,
         disbursements and advances of the Trustee,  its agents and counsel) and
         of the Holders allowed in such judicial proceeding, and

                  (ii) to  collect  and  receive  any  moneys or other  property
         payable or deliverable on any such claims and to distribute the same;

and any custodian,  receiver,  assignee,  trustee,  liquidator,  sequestrator or
similar  official in any such judicial  proceeding is hereby  authorized by each
Holder to make such  payments to the Trustee  and, in the event that the Trustee
shall consent to the making of such payments directly to the Holders, to pay the
Trustee  any  amount  due  it  for  the   reasonable   compensation,   expenses,
disbursements and advances of the Trustee, its agents and counsel, and any other
amounts due the Trustee under Section 7.07.

                  Nothing  herein  contained  shall be deemed to  authorize  the
Trustee  to  authorize  or consent to or accept or adopt on behalf of any Holder
any plan of reorganization, arrangement, adjustment or composition affecting the
Notes or the rights of any Holder  thereof,  or to authorize the Trustee to vote
in respect of the claim of any Holder in any such proceeding.

                  SECTION 6.10.  Priorities . If the Trustee  collects any money
pursuant to this Article Six, it shall pay out the money in the following order:

                  First:  to the Trustee for all amounts due under Section 7.07;
<PAGE>

                  Second:  to  Holders  for  amounts  then  due and  unpaid  for
         principal of,  premium,  if any, and interest,  if any, on the Notes in
         respect  of  which or for the  benefit  of which  such  money  has been
         collected,  ratably,  without  preference  or  priority  of  any  kind,
         according  to the amounts due and payable on such Notes for  principal,
         premium, if any, and interest, if any, respectively; and

                  Third: the balance,  if any, to the Person or Persons entitled
         thereto.

                  The Trustee, upon prior written notice to the Company, may fix
a record  date and  payment  date for any  payment to Holders  pursuant  to this
Section 6.10.

                  [SECTION  6.11.  Undertaking  for  Costs . In any suit for the
enforcement  of any right or remedy under this  Indenture or in any suit against
the  Trustee  for any  action  taken or omitted  by it as  Trustee,  a court may
require any party  litigant in such suit to file an undertaking to pay the costs
of the suit, and the court may assess  reasonable  costs,  including  reasonable
attorneys' fees, against any party litigant in the suit having due regard to the
merits and good faith of the claims or defenses made by the party litigant. This
Section  6.11  does  not  apply  to a suit by the  Trustee,  a suit by a  Holder
pursuant to Section  6.07 of this  Indenture,  or a suit by Holders of more than
10% in principal amount of the outstanding Notes.]

                  [SECTION  6.12.  Restoration  of Rights and  Remedies . If the
Trustee or any Holder has  instituted  any  proceeding  to enforce  any right or
remedy  under  this  Indenture  and such  proceeding  has been  discontinued  or
abandoned for any reason, or has been determined  adversely to the Trustee or to
such Holder,  then, and in every such case, subject to any determination in such
proceeding, the Company, the Trustee and the Holders shall be restored severally
and respectively to their former  positions  hereunder and thereafter all rights
and  remedies of the  Company,  the Trustee  and the Holders  shall  continue as
though no such proceeding had been instituted.]

                  SECTION  6.13.  Rights  and  Remedies  Cumulative  . Except as
otherwise  provided  with respect to the  replacement  or payment of  mutilated,
destroyed,  lost or stolen  Notes in  Section  2.08,  no right or remedy  herein
conferred  upon or  reserved  to the Trustee or to the Holders is intended to be
exclusive of any other right or remedy, and every right and remedy shall, to the
extent  permitted by law, be cumulative and in addition to every other right and
remedy  given  hereunder  or now or  hereafter  existing  at law or in equity or
otherwise.  The  assertion or employment  of any right or remedy  hereunder,  or
otherwise, shall not prevent the concurrent assertion or employment of any other
appropriate right or remedy.

                  SECTION  6.14.  Delay  or  Omission  Not  Waiver . No delay or
omission  of the  Trustee  or of any  Holder  to  exercise  any  right or remedy
accruing  upon any Event of  Default  shall  impair  any such right or remedy or
constitute  a waiver of any such Event of Default  or an  acquiescence  therein.
Every right and remedy  given by this Article Six or by law to the Trustee or to
the Holders may be  exercised  from time to time,  and as often as may be deemed
expedient, by the Trustee or by the Holders, as the case may be.
<PAGE>

                                  ARTICLE SEVEN
                                     TRUSTEE

                  SECTION 7.01. General . The duties and responsibilities of the
Trustee shall be as provided by the TIA and as set forth herein.  Whether or not
herein expressly so provided,  every provision of this Indenture relating to the
conduct or affecting  the  liability of or affording  protection  to the Trustee
shall be subject to the provisions of this Article Seven.

                  SECTION  7.02.  Certain  Rights of  Trustee .  Subject  to TIA
Sections 315(a) through (d):

                  (a) except during the continuance of an Event of Default,  the
         Trustee  undertakes  to perform such duties and only such duties as are
         specifically set forth in this Indenture,  and no implied  covenants or
         obligations  shall be read into this Indenture  against the Trustee and
         in the absence of bad faith on its part,  the Trustee may  conclusively
         rely,  as  to  the  truth  and   correctness   of  the  statements  and
         certificates  or  opinions  furnished  to  it  and  conforming  to  the
         requirements  of  this   Indenture;   but  in  the  case  of  any  such
         certificates or opinions which by any provision hereof are specifically
         required to be furnished to the Trustee,  the Trustee  shall be under a
         duty to examine the same to  determine  whether or not they  conform to
         the requirements of this Indenture;

                  (b)  in  case  an  Event  of  Default  has   occurred  and  is
         continuing,  the Trustee  shall  exercise such of the rights and powers
         vested  in it by this  Indenture,  and use the same  degree of care and
         skill in its exercise,  as a prudent person would exercise or use under
         the circumstances in the conduct of such person's own affairs;

                  (c) any request or direction of the Company  mentioned  herein
         shall be  sufficiently  evidenced by a Company Request or Company Order
         and any  resolution  of the  Board  of  Directors  may be  sufficiently
         evidenced by a Board Resolution;

                  (d)  whenever  in the  administration  of this  Indenture  the
         Trustee shall deem it desirable  that a matter be proved or established
         prior to  taking,  suffering  or  omitting  any action  hereunder,  the
         Trustee (unless other evidence be herein specifically  prescribed) may,
         in the  absence  of bad  faith  on its  part,  rely  upon  an  Officers
         Certificate;

                  (e) the  Trustee  may  consult  with  counsel  and the written
         advice of such  counsel or any  Opinion  of  Counsel  shall be full and
         complete  authorization  and protection in respect of any action taken,
         suffered  or omitted  by it  hereunder  in good  faith and in  reliance
         thereon;

                  (f) the Trustee  shall be under no  obligation to exercise any
         of the rights or powers  vested in it by this  Indenture at the request
         or direction of any of the Holders  pursuant to this Indenture,  unless
         such Holders shall have offered to the Trustee  reasonable  security or
         indemnity  against the costs,  expenses and liabilities  which might be
         incurred by it in compliance with such request or direction;
<PAGE>

                  (g) the Trustee  shall not be bound to make any  investigation
         into the  facts  or  matters  stated  in any  resolution,  certificate,
         statement,  instrument,  opinion,  report, notice, request,  direction,
         consent,  order, bond, debenture,  note, other evidence of indebtedness
         or other paper or document,  but the Trustee,  in its  discretion,  may
         make such further inquiry or  investigation  into such facts or matters
         as it may see fit,  and, if the Trustee  shall  determine  to make such
         further inquiry or  investigation,  it shall be entitled to examine the
         books,  records and premises of the Company,  personally or by agent or
         attorney;

                  (8) the  Trustee  may  execute  any of the  trusts  or  powers
         hereunder  or perform  any duties  hereunder  either  directly or by or
         through  agents or attorneys and the Trustee  shall not be  responsible
         for any  misconduct  or negligence on the part of any agent or attorney
         appointed with due care by it hereunder; and

                  (9) the  Trustee  shall not be liable  for any  action  taken,
         suffered  or  omitted  by it in good  faith  and  believed  by it to be
         authorized or within the discretion or rights or powers  conferred upon
         it by this Indenture.

                  The  Trustee  shall not be  required to expend or risk its own
funds or otherwise  incur any financial  liability in the  performance of any of
its duties  hereunder,  or in the  exercise of any of its rights or powers if it
shall have  reasonable  grounds for  believing  that  repayment of such funds or
adequate  indemnity against such risk or liability is not reasonably  assured to
it.

                  SECTION 7.03.  Individual Rights of Trustee . The Trustee,  in
its individual or any other  capacity,  may become the owner or pledgee of Notes
and may otherwise deal with the Company or its  Affiliates  with the same rights
it would  have if it were not the  Trustee.  Any Agent may do the same with like
rights. However, the Trustee is subject to TIA Sections 310(b) and 311.

                  SECTION 7.04.  Trustee's Disclaimer . The Trustee (i) makes no
representation  as to the  validity or adequacy  of this  Indenture,  the Pledge
Agreement or the Notes,  (ii) shall not be accountable  for the Company's use or
application  of the proceeds  from the Notes and (iii) shall not be  responsible
for any  statement  contained  herein,  in the Pledge  Agreement or in the Notes
other than its certificate of  authentication.  The Trustee shall not be charged
with  knowledge  of any  Default  or Event of Default  unless (i) a  Responsible
Officer  of  the  Trustee  assigned  to  its  Corporate  Trustee  Administration
Department  (or  successor  department  or group)  shall have  actual  knowledge
thereof or (ii) the Trustee shall have received  written  notice  thereof at its
Corporate  Trust  office from the Company or any Holder.  No  provision  of this
Indenture shall require the Trustee to expend or risk its own funds or otherwise
incur any financial liability in the performance of any of its duties hereunder,
or in the exercise of any of its rights or powers,  if it shall have  reasonable
grounds for believing that repayment of such funds or adequate indemnity against
such risk or liability is not reasonably assured to it.
<PAGE>

                  SECTION 7.05.  Notice of Default . If any Default or any Event
of Default  occurs and is continuing  and if such Default or Event of Default is
known to a trust  officer of the Trustee,  the Trustee shall mail to each Holder
in the manner and to the extent  provided in TIA Section  313(c)  notice of such
Default or Event of Default within 90 days after it occurs,  unless such Default
or Event of Default has been cured; provided,  however, that, except in the case
of a default in the payment of the principal of, premium, if any, or interest on
any Note,  the Trustee shall be protected in  withholding  such notice if and so
long as the board of directors,  the executive committee or a trust committee of
directors  and/or  Responsible  Officers of the Trustee in good faith determines
that the withholding of such notice is in the interest of the Holders.

                  SECTION  7.06.  Reports  by Trustee to Holders . To the extent
required  by TIA  Section  313(a),  within  60 days  after  May 15 of each  year
commencing with 1997 and for as long as there are Notes  outstanding  hereunder,
the Trustee  shall mail to each Holder the  Trustee's  brief  report dated as of
such date that complies with TIA Section  313(a).  The Trustee also shall comply
with TIA Section 313(b) and TIA Section 313(c) and (d). A copy of such report at
the time of its  mailing  to  Holders  shall be filed  with the  Commission,  if
required, and each stock exchange, if any, on which the Notes are listed.

                  The  Company  shall  promptly  notify the Trustee if the Notes
become  listed on any stock  exchange,  and the  Trustee  shall  comply with TIA
Section 313(d).

                  SECTION 7.07.  Compensation  and Indemnity . The Company shall
pay to the Trustee from time to time such  reasonable  compensation  as shall be
agreed upon in writing for its  services.  The  reasonable  compensation  of the
Trustee  shall not be  limited  by any law on  compensation  of a trustee  of an
express  trust.  The Company  shall  reimburse  the Trustee upon request for all
reasonable  out-of-pocket expenses and advances incurred or made by the Trustee.
Such expenses  shall  include the  reasonable  compensation  and expenses of the
Trustee's agents and counsel.

                  The  Company  shall  indemnify  the Trustee  for,  and hold it
harmless  against,  any loss or  liability  or  expense  incurred  by it without
negligence  or bad  faith  on its part in  connection  with  the  acceptance  or
administration  of this Indenture and the Pledge  Agreement and its duties under
this  Indenture,  the  Pledge  Agreement  and  the  Notes,  including,   without
limitation,  the costs and  expenses of  defending  itself  against any claim or
liability  and of  complying  with  any  process  served  upon  it or any of its
officers in connection  with the exercise or performance of any of its powers or
duties under this Indenture, the Pledge Agreement and the Notes.

                  To secure the Company's  payment  obligations  in this Section
7.07,  the Trustee shall have a lien prior to the Notes on all money or property
held or collected by the  Trustee,  in its capacity as Trustee,  except money or
property  held in trust to pay principal  of,  premium,  if any, and interest on
particular Notes.
<PAGE>

                  Without prejudice to any other rights available to the Trustee
under  applicable law, if the Trustee incurs expenses or renders  services after
the occurrence of an Event of Default  specified in clause (g) or (h) of Section
6.01,  the expenses and the  compensation  for the services  will be intended to
constitute  expenses  of  administration  under  Title 11 of the  United  States
Bankruptcy  Code or any  applicable  federal  or  state  law for the  relief  of
debtors.

                  SECTION  7.08.  Replacement  of  Trustee  . A  resignation  or
removal of the  Trustee and  appointment  of a successor  Trustee  shall  become
effective  only  upon the  successor  Trustee's  acceptance  of  appointment  as
provided in this Section 7.08.

                  The Trustee may resign at any time by so notifying the Company
in writing at least 30 days prior to the date of the proposed  resignation.  The
Holders of a majority in principal  amount of the  outstanding  Notes may remove
the Trustee by so  notifying  the Trustee in writing and may appoint a successor
Trustee with the consent of the Company.

                  The  Company may at any time  remove the  Trustee,  by Company
Order given at least 30 days prior to the date of the proposed removal; provided
that at such date no Event of Default shall have occurred and be continuing.

                  Except as  provided in the second  sentence  of the  preceding
paragraph,  if the Trustee resigns or is removed,  or if a vacancy exists in the
office of Trustee for any reason, the Company shall promptly appoint a successor
Trustee.  Within one year after the successor Trustee takes office,  the Holders
of a  majority  in  principal  amount of the  outstanding  Notes  may  appoint a
successor Trustee to replace the successor Trustee appointed by the Company.  If
the successor  Trustee does not deliver its written  acceptance  required by the
next succeeding paragraph of this Section 7.08 within 30 days after the retiring
Trustee resigns or is removed,  the retiring Trustee, the Company or the Holders
of a majority in  principal  amount of the  outstanding  Notes may  petition any
court of competent jurisdiction for the appointment of a successor Trustee.

                  A successor Trustee shall deliver a written  acceptance of its
appointment to the retiring  Trustee and to the Company.  Immediately  after the
delivery of such  written  acceptance,  subject to the lien  provided in Section
7.07, (i) the retiring Trustee shall transfer all property held by it as Trustee
to the  successor  Trustee,  (ii) the  resignation  or removal  of the  retiring
Trustee shall become  effective  and (iii) the successor  Trustee shall have all
the rights, powers and duties of the Trustee under this Indenture and the Pledge
Agreement.  A  successor  Trustee  shall mail notice of its  succession  to each
Holder.

                  Subject to Section 6.11, if the Trustee is no longer qualified
or eligible under Section 7.10, any Holder who satisfies the requirements of TIA
Section 310(b) may petition any court of competent  jurisdiction for the removal
of the Trustee and the appointment of a successor Trustee.
<PAGE>

                  The  Company  shall  give  notice of any  resignation  and any
removal  of the  Trustee  and each  appointment  of a  successor  Trustee to all
Holders.  Each notice shall  include the name of the  successor  Trustee and the
address of its Corporate Trust Office.

                  Notwithstanding  replacement  of the Trustee  pursuant to this
Section  7.08,  the  Company's  obligations  under  Section 7.07 shall  continue
indefinitely for the benefit of the retiring Trustee.

                  SECTION 7.09. Successor Trustee by Merger, Etc. If the Trustee
consolidates  with,  merges or converts into, or transfers all or  substantially
all of its corporate trust business to, another  corporation or national banking
association,  the  resulting,  surviving or transferee  corporation  or national
banking  association without any further act shall be the successor Trustee with
the same  effect  as if the  successor  Trustee  had been  named as the  Trustee
herein.

                  SECTION 7.10. Eligibility . This Indenture shall always have a
Trustee that satisfies the  requirements  of TIA Section  310(a)(1) and (5). The
Trustee shall have a combined  capital and surplus of at least  $100,000,000  as
set forth in its most recent published  annual report of condition.  The Trustee
shall be subject to TIA Section  310(b),  subject to the  penultimate  paragraph
thereof.

                  SECTION  7.11.  Money Held in Trust . The Trustee shall not be
liable for interest on any money  received by it except as the Trustee may agree
in writing  with the  Company.  Money held in trust by the  Trustee  need not be
segregated from other funds except to the extent required by law, and except for
money held in trust  under  Article  Eight of this  Indenture  and money held in
trust pursuant to the Pledge Agreement.

                  SECTION 7.12.  Withholding  Taxes . The Trustee,  as agent for
the  Company,  shall  exclude and withhold  from each  payment of principal  and
interest  and other  amounts due  hereunder  or under the Notes any and all U.S.
withholding  taxes applicable  thereto as required by law. The Trustee agrees to
act as such withholding agent and, in connection therewith, whenever any present
or future taxes or similar  charges are required to be withheld  with respect to
any amounts payable in respect of the Notes, to withhold such amounts and timely
pay the same to the  appropriate  authority  in the name of and on behalf of the
Holders of the Notes, that it will file any necessary withholding tax returns or
statements  when due,  and that,  as  promptly  as  possible  after the  payment
thereof,  it will  deliver to each  Holder of a Note  appropriate  documentation
showing the payment thereof,  together with such additional documentary evidence
as such Holders may reasonably request from time to time.
<PAGE>


                                  ARTICLE EIGHT
                             DISCHARGE OF INDENTURE

                  SECTION 8.01. Termination of Company's Obligations . Except as
otherwise  provided in this Section 8.01,  each of the Company may terminate its
obligations under the Notes and this Indenture if:

                  (a) all Notes  previously  authenticated  and delivered (other
         than  destroyed,  lost or stolen Notes that have been replaced or Notes
         for whose  payment money or securities  have  theretofore  been held in
         trust and  thereafter  repaid to the  Company,  as  provided in Section
         8.05) have been  delivered  to the  Trustee  for  cancellation  and the
         Company has paid all sums payable by it hereunder; or

                  (b) (i) all such Notes  mature  within one year or all of them
         are to be called for  redemption  within  one year  under  arrangements
         satisfactory  to the Trustee for giving the notice of redemption,  (ii)
         the Company irrevocably  deposits in trust with the Trustee during such
         one-year period,  under the terms of an irrevocable  trust agreement in
         form satisfactory to the Trustee, as trust funds solely for the benefit
         of the Holders of such Notes for that purpose, money or U.S. Government
         Obligations  sufficient (in the opinion of a nationally recognized firm
         of independent public accountants  expressed in a written certification
         thereof  delivered  to  the  Trustee),  without  consideration  of  any
         reinvestment of any interest  thereon,  to pay principal,  premium,  if
         any, and interest on such Notes to maturity or redemption,  as the case
         may be, and to pay all other sums  payable  by it  hereunder,  (iii) no
         Default  or Event of  Default  with  respect  to the Notes  shall  have
         occurred  and be  continuing  on the date of such  deposit,  (iv)  such
         deposit  will not result in a breach or violation  of, or  constitute a
         default under,  this Indenture or any other  agreement or instrument to
         which the  Company is a party or by which it is bound [, (v) if at such
         time the Notes are listed on a national securities exchange,  the Notes
         will  not be  delisted  as a result  of such  deposit,  defeasance  and
         discharge,] [and] [(v)] [(vi)] the Company has delivered to the Trustee
         an  Officers'  Certificate  and an  Opinion  of  Counsel,  in each case
         stating that all conditions  precedent  provided for herein relating to
         the  satisfaction  and discharge of this  Indenture  have been complied
         with.

                  With  respect  to the  foregoing  clause  (a),  the  Company's
obligations  under  Section 7.07 shall  survive.  With respect to the  foregoing
clause (b), the Company's  obligations in Sections 2.02, 2.03, 2.04, 2.05, 2.06,
2.07,  2.08,  2.09,  2.14,  4.01,  4.02,  7.07,  7.08, 8.04, 8.05 and 8.06 shall
survive until the Notes have matured or have been redeemed. Thereafter, only the
Company's  obligations in Sections 7.07, 8.05 and 8.06 shall survive.  After any
such irrevocable  deposit, the Trustee upon request shall acknowledge in writing
the discharge of the Company's  obligations  under the Notes and this Indenture,
and the Guarantor's  obligations under the Guarantee and this Indenture,  except
for those surviving obligations specified above.

                  SECTION  8.02.  Defeasance  and  Discharge  of Indenture . The
Company  will be  deemed to have  paid and will be  discharged  from any and all
obligations  in  respect  of the  Notes on the  123rd  day after the date of the
deposit referred to in clause (a) of this Section 8.02 if:
<PAGE>

                  (a) with  reference  to this  Section  8.02,  the  Company has
         irrevocably  deposited or caused to be  irrevocably  deposited with the
         Trustee and has conveyed all right,  title and interest for the benefit
         of the Holders,  under the terms of an irrevocable  trust  agreement in
         form satisfactory to the Trustee as trust funds in trust,  specifically
         pledged to the Trustee  for the benefit of the Holders as security  for
         payment of the principal of, premium, if any, and interest,  if any, on
         the Notes, and dedicated solely to, the benefit of the Holders,  in and
         to (i) money in an  amount,  (ii)  U.S.  Government  Obligations  that,
         through the payment of  interest,  premium,  if any,  and  principal in
         respect thereof in accordance with their terms, will provide, not later
         than one day before  the due date of any  payment  referred  to in this
         clause  (a),  money in an amount or (iii) a  combination  thereof in an
         amount  sufficient,  in the opinion of a nationally  recognized firm of
         independent  public  accountants  expressed in a written  certification
         thereof  delivered  to the  Trustee,  to  pay  and  discharge,  without
         consideration of the reinvestment of such interest and after payment of
         all federal,  state and local taxes or other charges and assessments in
         respect thereof payable by the Trustee,  the principal of, premium,  if
         any,  and  accrued  interest  on the  outstanding  Notes at the  Stated
         Maturity of such  principal  or interest  or upon  earlier  redemption;
         provided  that the Trustee  shall have been  irrevocably  instructed to
         apply such money or the proceeds of such U.S. Government Obligations to
         the payment of such  principal,  premium,  if any,  and  interest  with
         respect to the Notes and to give any related notice of redemption;

                  (b) such deposit will not result in a breach or violation  of,
         or constitute a default under, this Indenture or any other agreement or
         instrument to which the Company or any of its  Subsidiaries  is a party
         or by which the Company or any of its Subsidiaries is bound;

                  (c)  immediately  after giving effect to such deposit on a pro
         forma  basis,  no Default or Event of Default,  or event that after the
         giving  of notice or lapse of time or both  could  become a Default  or
         Event of Default,  shall have occurred and be continuing on the date of
         such  deposit or during  the  period  ending on the 123rd day after the
         date of such deposit;

                  (d) the Company shall have delivered to the Trustee (i) either
         (A) a ruling directed to the Trustee received from the Internal Revenue
         Service to the effect that the Holders  will not  recognize  additional
         income, gain or loss for federal income tax purposes as a result of the
         Company's  exercise of its option  under this  Section 8.02 and will be
         subject to federal income tax on the same amount and in the same manner
         and at the same  times as would  have been the case if such  option had
         not been  exercised  or (B) an Opinion of Counsel to the same effect as
         the ruling  described  in clause (A) above  accompanied  by a ruling to
         that effect published by the Internal Revenue Service, unless there has
         been a change in the  applicable  federal income tax law since the date
         of this Indenture such that a ruling from the Internal  Revenue Service
         is no longer required and (ii) an Opinion of Counsel to the effect that
         (A)  the  creation  of  the  defeasance  trust  does  not  violate  the
         Investment  Company  Act of 1940 and (B) after the  passage of 123 days
         following the deposit (except,  with respect to any trust funds for the
         account  of any  


<PAGE>

         Holder  who may be  deemed  to be  "connected"  with  the  Company  for
         purposes  of the  Insolvency  Act 1986  after two years  following  the
         deposit),  the trust funds will not be subject to the effect of Section
         547 of the United States  Bankruptcy Code or Section 15 of the New York
         Debtor and  Creditor  Law and either (I) the trust funds will no longer
         remain the property of the Company (and  therefore  will not be subject
         to the effect of any applicable bankruptcy, insolvency,  reorganization
         or similar laws  affecting  creditors'  rights  generally) or (II) if a
         court  were to rule under any such law in any case or  proceeding  that
         the trust funds  remained  property of the  Company (a)  assuming  such
         trust funds  remained in the  possession  of the Trustee  prior to such
         court  ruling to the extent not paid to the  Holders,  the Trustee will
         hold,  for the benefit of the Holders,  a valid and perfected  security
         interest in such trust funds that is not  avoidable  in  bankruptcy  or
         otherwise  and (b) no property,  rights in property or other  interests
         granted to the Trustee or the Holders in exchange  for, or with respect
         to, such trust funds will be subject to any prior  rights of holders of
         other Indebtedness of the Company or any of its Notes;

                  (e) if at  such  time  the  Notes  are  listed  on a  national
         securities exchange, the Company shall have delivered to the Trustee an
         Opinion of Counsel to the effect that the Notes will not be delisted as
         a result of the  Company's  exercise of its opinion  under this Section
         8.02; and

                  (f)  the  Company  shall  have  delivered  to the  Trustee  an
         Officers'  Certificate and an Opinion of Counsel,  in each case stating
         that all  conditions  precedent  provided  for herein  relating  to the
         defeasance contemplated by this Section 8.02 have been complied with.

                  Notwithstanding  the  foregoing,  prior to the end of the post
deposit period  referred to in clause  (d)(ii)(B) of this Section 8.02,  none of
the Company's  obligations under this Indenture shall be discharged.  Subsequent
to the end of such period  with  respect to this  Section  8.02,  the  Company's
obligations in Sections 2.02,  2.03,  2.04,  2.05, 2.06, 2.07, 2.08, 2.09, 2.14,
4.01, 4.02, 7.07, 7.08, 8.04, 8.05 and 8.06 shall survive until the Notes mature
or are redeemed.  Thereafter,  only the Company's  obligations in Sections 7.07,
8.05 and 8.06 shall  survive.  If and when a ruling  from the  Internal  Revenue
Service or an Opinion of Counsel  referred to in clause  (d)(i) of this  Section
8.02 may be provided  specifically  without regard to, and not in reliance upon,
the continuance of the Company's obligations under the first sentence of Section
4.01,  then the  Company's  obligations  under such  sentence  shall  cease upon
delivery to the Trustee of such ruling or Opinion of Counsel and compliance with
the other  conditions  precedent  provided for herein relating to the defeasance
contemplated by this Section 8.02.

                  After any such irrevocable  deposit,  the Trustee upon request
shall  acknowledge in writing the discharge of the Company's  obligations  under
the Notes, any Subsidiary Guarantee, if any, and this Indenture except for those
surviving obligations in the immediately preceding paragraph.

                  SECTION 8.03.  Defeasance of Certain Obligations . The Company
may omit to comply with any term,  provision or  condition  set forth in clauses
(iii) and (iv) of Section  5.01 


<PAGE>

and Sections  4.03 through 4.17 (except for any covenant  otherwise  required by
the TIA),  and clauses (c) and (d) of Section 6.01 with respect to clauses (iii)
and (iv) of Section  5.01,  clause (e) of Section  6.01 with respect to Sections
4.03 through 4.17, except as aforesaid,  and clause (f) of Section 6.01 shall be
deemed not to be Events of Default, in each case with respect to the outstanding
Notes if:

                  (a) with  reference  to this  Section  8.03,  the  Company has
         irrevocably  deposited or caused to be  irrevocably  deposited with the
         Trustee and conveyed  all right,  title and interest to the Trustee for
         the benefit of the  Holders,  under the terms of an  irrevocable  trust
         agreement in form and  substance  satisfactory  to the Trustee as trust
         funds in trust,  specifically pledged to the Trustee for the benefit of
         the Holders as security for payment of the  principal of,  premium,  if
         any, and interest,  if any, on the Notes,  and dedicated solely to, the
         benefit of the  Holders,  in and to (i) money in an  amount,  (ii) U.S.
         Government  Obligations  that,  through  the  payment of  interest  and
         principal  in respect  thereof in  accordance  with their  terms,  will
         provide,  not later  than one day  before  the due date of any  payment
         referred  to in  this  clause  (a),  money  in an  amount  or  (iii)  a
         combination  thereof  in an  amount  sufficient,  in the  opinion  of a
         nationally  recognized firm of independent public accountants expressed
         in a written certification thereof delivered to the Trustee, to pay and
         discharge,  without  consideration of the reinvestment of such interest
         and after  payment  of all  federal,  state  and  local  taxes or other
         charges and assessments in respect thereof payable by the Trustee,  the
         principal of, premium, if any, and interest on the outstanding Notes on
         the Stated  Maturity or upon earlier  redemption  of such  principal or
         interest;  provided  that  the  Trustee  shall  have  been  irrevocably
         instructed to apply such money or the proceeds of such U.S.  Government
         Obligations  to the payment of such  principal,  premium,  if any,  and
         interest  with  respect to the Notes and to give any related  notice of
         redemption;

                  (b) such deposit will not result in a breach or violation  of,
         or constitute a default under, this Indenture or any other agreement or
         instrument to which the Company or any of its  Subsidiaries  is a party
         or by which the Company or any of its Subsidiaries is bound;

                  (c)  immediately  after giving effect to such deposit or a pro
         forma  basis,  no Default or Event of Default,  or event that after the
         giving  of notice or lapse of time or both  would  become a Default  or
         Event of Default,  shall have occurred and be continuing on the date of
         such deposit or during the period ending on the 123rd day after the day
         of such deposit;

                  (d) the  Company  has  delivered  to the Trustee an Opinion of
         Counsel to the effect  that (i) the  creation of the  defeasance  trust
         does not violate the Investment  Company Act of 1940,  (ii) the Holders
         will not recognize income, gain or loss for federal income tax purposes
         as a result  of such  deposit  and the  defeasance  of the  obligations
         referred to in the first  paragraph  of this  Section  8.03 and will be
         subject to federal income tax on the same amount and in the same manner
         and at the same times as would have been the case if such  deposit  and
         defeasance  had not  occurred  and 


<PAGE>

         (iii) after the passage of 123 days following the deposit  (except with
         respect  to any trust  funds for the  account  of any Holder who may be
         deemed  to  be  "connected"  with  the  Company  for  purposes  of  the
         Insolvency Act 1986 after two years  following the deposit),  the trust
         funds will not be  subject  to the effect of Section  547 of the United
         States  Bankruptcy  Code or  Section  15 of the  New  York  Debtor  and
         Creditor  Law, and either (A) the trust funds will no longer remain the
         property  of the  Company  (and  therefore  will not be  subject to the
         effect of any  applicable  bankruptcy,  insolvency,  reorganization  or
         similar laws affecting  creditor's  rights generally) or (B) if a court
         were to rule  under  any such law in any  case or  proceeding  that the
         trust funds  remained  property of the Company (1) assuming  such trust
         funds  remained in the  possession  of the Trustee  prior to such court
         ruling to the extent not paid to the  Holders,  the Trustee  will hold,
         for the benefit of the Holders, a valid and perfected security interest
         in such trust funds that is not  avoidable in  bankruptcy  or otherwise
         and (2) no property,  rights in property or other interests  granted to
         the Trustee or the Holders in  exchange  for, or with  respect to, such
         trust  funds will be  subject  to any prior  rights or holders of other
         Indebtedness of the Company or any of its Notes;

                  (e) if at  such  time  the  Notes  are  listed  on a  national
         securities  exchange,  the  Company  has  delivered  to the  Trustee an
         Opinion of Counsel to the effect that the Notes will not be delisted as
         a result of the  Company's  exercise of its option under  Section 8.03;
         and

                  (f) the Company  has  delivered  to the  Trustee an  Officers'
         Certificate  and an Opinion of Counsel,  in each case  stating that all
         conditions  precedent  provided for herein  relating to the  defeasance
         contemplated by this Section 8.03 have been complied with.

                  SECTION 8.04.  Application of Trust Money . Subject to Section
8.06,  the Trustee or Paying Agent shall hold in trust money or U.S.  Government
Obligations  deposited  with it pursuant to Section  8.01,  8.02 or 8.03, as the
case may be,  and shall  apply  the  deposited  money  and the  money  from U.S.
Government  Obligations  in accordance  with the Notes and this Indenture to the
payment of principal of,  premium,  if any, and interest on the Notes;  but such
money need not be segregated  from other funds except to the extent  required by
law.

                  SECTION 8.05. Repayment to Company . Subject to Sections 7.07,
8.01,  8.02 and 8.03, the Trustee and the Paying Agent shall promptly pay to the
Company upon request set forth in an Officers' Certificate any excess money held
by them at any time and  thereupon  shall be relieved  from all  liability  with
respect to such money. The Trustee and the Paying Agent shall pay to the Company
any  money  held by them for the  payment  of  principal,  premium,  if any,  or
interest that remains unclaimed for two years; provided that the Trustee or such
Paying Agent before being required to make any payment may cause to be published
at the expense of the Company once in a newspaper of general  circulation in the
City of New York or mail to each Holder  entitled to such money notice that such
money remains  unclaimed and that after a date specified therein (which shall be
at least 30 days from the date of such  publication  or mailing)  any  unclaimed
balance  of such  money  then  remaining  will be repaid to the  Company.  After
payment to the Company,  Holders entitled to such money must look to the 


<PAGE>

Company for payment as general  creditors  unless an applicable  law  designates
another  Person,  and all  liability  of the Trustee and such Paying  Agent with
respect to such money shall cease.

                  SECTION 8.06.  Reinstatement  . If the Trustee or Paying Agent
is unable to apply any money or U.S.  Government  Obligations in accordance with
Section  8.01,  8.02 or  8.03,  as the  case  may be,  by  reason  of any  legal
proceeding  or by reason of any order or judgment  of any court or  governmental
authority enjoining,  restraining or otherwise prohibiting such application, the
Company's obligations under this Indenture,  the Guarantee,  and the Notes shall
be revived and reinstated as though no deposit had occurred  pursuant to Section
8.01, 8.02 or 8.03, as the case may be, until such time as the Trustee or Paying
Agent is permitted  to apply all such money or U.S.  Government  Obligations  in
accordance  with Section 8.01,  8.02 or 8.03, as the case may be; provided that,
if the  Company  has made any  payment of  principal  of,  premium,  if any,  or
interest  on any Notes  because of the  reinstatement  of its  obligations,  the
Company  shall be  subrogated  to the  rights of the  Holders  of such  Notes to
receive such payment from the money or U.S.  Government  Obligations held by the
Trustee or Paying Agent.


                                          ARTICLE NINE
                               AMENDMENTS, SUPPLEMENTS AND WAIVERS

                  SECTION 9.01.  Without Consent of Holders . The Company,  when
authorized by Board  Resolution,  and the Trustee may amend or  supplement  this
Indenture,  the Notes and the Pledge Agreement  without notice to or the consent
of any Holder:

                  (a) to cure any  ambiguity,  defect or  inconsistency  in this
         Indenture;  provided  that such  amendments  or  supplements  shall not
         adversely affect the interests of the Holders in any material respect;

                  (b) to comply with Article Five and to provide for  amendments
         to the Pledge  Agreement  pursuant to Section  10.01 and to add Pledged
         Notes to the Pledge Account;

                  (c) to add to the  covenants of the Company for the benefit of
         the Holders or to surrender  any right or power herein  conferred  upon
         the Company; or

                  (d) to evidence and provide for the  acceptance of appointment
         hereunder by a successor Trustee with respect to the Notes;

                  (e)      to add any additional Events of Default; or

                  (f)      to add a Guarantor.

                  SECTION  9.02.  With  Consent of Holders . Subject to Sections
6.04 and 6.07 and  without  prior  notice  to the  Holders,  the  Company,  when
authorized by its Board of Directors (as evidenced by a Board  Resolution),  and
the Trustee may amend this Indenture [, the Notes


<PAGE>

and the Pledge  Agreement]  with the  consent of the  Holders of not less than a
majority  in  aggregate   principal   amount  at  maturity  of  the  Notes  then
outstanding.

                  Notwithstanding  the provisions of this Section 9.02,  without
the consent of each Holder affected, an amendment or waiver,  including a waiver
pursuant to Section 6.04, may not:

                  (i) change the Stated  Maturity  of the  principal  of, or any
         installment of
         interest on, any Note;

                  (ii) reduce the  principal  amount of, or premium,  if any, or
         interest on, any Note;

                  (iii) change the place or currency of payment of principal of,
         or premium, if any, or interest on, any Note;

                  (iv) impair the right to institute suit for the enforcement of
         any  payment  on or after the  Stated  Maturity  (or,  in the case of a
         redemption, on or after the Redemption Date) of any Note;

                  (v) reduce the  above-stated  percentage of outstanding  Notes
         the  consent  of whose  Holders  is  necessary  to  modify or amend the
         Indenture;

                  (vi) waive a default in the payment of principal of,  premium,
         if any, or interest on the Notes;

                  (vii) reduce the percentage or aggregate  principal  amount at
         maturity of outstanding Notes the consent of whose Holders is necessary
         for waiver of  compliance  with certain  provisions of the Indenture or
         for waiver of certain defaults; or

                  (viii)   release the Guarantors from the Note Guarantee.

                  It shall not be necessary for the consent of the Holders under
this Section  9.02 to approve the  particular  form of any  proposed  amendment,
supplement or waiver,  but it shall be  sufficient if such consent  approves the
substance thereof.

                  After an  amendment,  supplement  or waiver under this Section
9.02 becomes effective, the Company shall mail to the Holders affected thereby a
notice briefly describing such amendment, supplement or waiver. The Company will
mail supplemental indentures to Holders upon request. Any failure of the Company
to mail such  notice,  or any defect  therein,  shall not,  however,  in any way
impair or affect the validity of any such supplemental indenture or waiver.

                  SECTION  9.03.  Revocation  and  Effect of  Consent . Until an
amendment  or  waiver  becomes  effective,  a  consent  to it by a  Holder  is a
continuing  consent  by the  Holder  and  every  subsequent  Holder of a Note or
portion  of a Note that  evidences  the same debt as the Note of the  consenting
Holder,  even if notation of the consent is not made on any Note.  However, 


<PAGE>

any such  Holder or  subsequent  Holder may revoke the consent as to its Note or
portion of its Note.  Such  revocation  shall be  effective  only if the Trustee
receives the notice of revocation before the date any such amendment, supplement
or waiver  becomes  effective.  An amendment,  supplement or waiver shall become
effective on receipt by the Trustee of written  consents from the Holders of the
requisite percentage in principal amount of the outstanding Notes.

                  The Company may,  but shall not be obligated  to, fix a record
date for the purpose of determining the Holders of  Certificated  Notes entitled
to consent to any  amendment,  supplement or waiver.  If a record date is fixed,
then,  notwithstanding  the  last two  sentences  of the  immediately  preceding
paragraph,  those persons who were Holders of Certificated  Notes at such record
date (or their duly designated proxies) and only those persons shall be entitled
to  consent to such  amendment,  supplement  or waiver or to revoke any  consent
previously  given,  whether or not such  persons  continue to be Holders of such
Certificated  Notes after such record date.  No such  consent  shall be valid or
effective for more than 90 days after such record date.

                  After an amendment, supplement or waiver becomes effective, it
shall bind every Holder unless it is of the type described in any of clauses (a)
through  (h) of  Section  9.02.  In case of an  amendment  or waiver of the type
described in clauses (a) through (h) of Section  9.02,  the  amendment or waiver
shall bind each Holder who has consented to it and every subsequent  Holder of a
Note that evidences the same indebtedness as the Note of such consenting Holder.

                  SECTION  9.04.  Notation  on  or  Exchange  of  Notes  . If an
amendment,  supplement  or waiver  changes the terms of a Note,  the Trustee may
require the Holder to deliver such Note to the Trustee. The Trustee may place an
appropriate  notation on the Note about the  changed  terms and return it to the
Holder and the Trustee may place an appropriate  notation on any Note thereafter
authenticated.  Alternatively,  if the Company or the Trustee so determines, the
Company in exchange for the Note shall issue and the Trustee shall  authenticate
a new Note that reflects the changed terms.

                  SECTION  9.05.  Trustee to Sign  Amendments,  Etc. The Trustee
shall be entitled to receive,  and shall be fully  protected in relying upon, an
Opinion of Counsel  stating that the execution of any  amendment,  supplement or
waiver  authorized  pursuant to this Article Nine is  authorized or permitted by
this  Indenture.  The Trustee  shall execute any such  amendment,  supplement or
waiver upon  satisfaction of the conditions  precedent thereto contained herein,
unless such amendment,  supplement or waiver adversely affects the Trustee's own
rights, duties or immunities under this Indenture or otherwise.

                  SECTION  9.06.  Conformity  with Trust  Indenture  Act . Every
supplemental  indenture  executed pursuant to this Article Nine shall conform to
the requirements of the TIA as then in effect.
<PAGE>


                                   ARTICLE TEN
                                    SECURITY

                  SECTION 10.01. Security . (a) The Company shall (i) enter into
the Pledge  Agreement (in the form attached hereto as Exhibit G) and comply with
the terms and  provisions  thereof and (ii) use a portion of the net proceeds of
the  placement of Notes on the Closing Date to purchase the Pledged  Notes to be
pledged  to the  Trustee  for the  benefit  of the  Holders of the Notes in such
amount as will be  sufficient  upon receipt of scheduled  interest and principal
payments of the Pledged Notes, in the opinion of a nationally recognized firm of
independent public accountants  selected by the Company,  to provide for payment
in full of the first six  scheduled  interest  payments  due on the  Notes.  The
Pledged  Notes shall be pledged by the Company to the Trustee for the benefit of
the Holders of the Notes and shall be held by the Trustee in the Pledge  Account
pending disbursement pursuant to the Pledge Agreement.

                  (b) Each Holder,  by its  acceptance  of a Note,  consents and
agrees to the terms of the Pledge Agreement (including,  without limitation, the
provisions  providing for  foreclosure  and release of the Pledged Notes) as the
same may be in effect or may be amended from time to time in accordance with its
terms, and authorizes and directs the Trustee to enter into the Pledge Agreement
and to perform its respective  obligations  and exercise its  respective  rights
thereunder in accordance therewith.  The Company will do or cause to be done all
such acts and things as may be necessary or proper, or as may be required by the
provisions  of the Pledge  Agreement,  to assure and  confirm to the Trustee the
security  interest  in the  Pledged  Notes  contemplated  hereby,  by the Pledge
Agreement or any part thereof, as from time to time constituted, so as to render
the same  available  for the security and benefit of this  Indenture  and of the
Notes secured hereby, according to the intent and purposes herein expressed. The
Company shall take, or shall cause to be taken, upon request of the Trustee, any
and all actions reasonably  required to cause the Pledge Agreement to create and
maintain,  as security for the  obligations  of the Company under this Indenture
and the Notes,  valid and  enforceable  first  priority  liens in and on all the
Pledge  Notes,  in favor of the Trustee,  superior to and prior to the rights of
all third Persons and subject to no other Liens other than as provided herein.

                  (c) The  release of any Pledged  Notes  pursuant to the Pledge
Agreement  will not be deemed to impair the  security  under this  Indenture  in
contravention  of the  provisions  hereof if and to the extent the Pledged Notes
are released pursuant to this Indenture and the Pledge Agreement.  To the extent
applicable,  the Company shall cause TIA Section 314(d)  relating to the release
of  property or  securities  from the Lien and  security  interest of the Pledge
Agreement  and  relating  to  the  substitution  therefor  of  any  property  or
securities  to be  subjected  to the Lien and  security  interest  of the Pledge
Agreement  to be  complied  with.  Any  certificate  or opinion  required by TIA
Section  314(d) may be made by an officer of the Company,  except in cases where
TIA  Section  314(d)  requires  that such  certificate  or opinion be made by an
independent Person, which Person shall be an independent engineer,  appraiser or
other expert  selected or approved by the Trustee in the exercise of  reasonable
care.

                  (d) The Company  shall cause TIA Section  314(b),  relating to
opinions  of  counsel  regarding  the Lien  under the  Pledge  Agreement,  to be
complied  with.  The Trustee may,


<PAGE>

to the extent  permitted by Sections 7.01 and 7.02 hereof,  accept as conclusive
evidence of compliance with the foregoing provisions the appropriate  statements
contained in such instruments.

                  (e) The Trustee  may, in its sole  discretion  and without the
consent of the  Holders,  on behalf of the  Holders,  take all  actions it deems
necessary or  appropriate in order to (i) enforce any of the terms of the Pledge
Agreement and (ii) collect and receive any and all amounts payable in respect of
the  obligations  of the Company  thereunder.  The  Trustee  shall have power to
institute  and to maintain  such suits and  proceedings  as the Trustee may deem
expedient to preserve or protect its  interests and the interests of the Holders
in the  Pledged  Notes  (including  power to  institute  and  maintain  suits or
proceedings to restrain the enforcement of or compliance with any legislative or
other  governmental  enactment,  rule or order that may be  unconstitutional  or
otherwise  invalid if the  enforcement  of, or compliance  with, such enactment,
rule or order would impair the security interest  hereunder or be prejudicial to
the interests of the Holders or of the Trustee).


                                 ARTICLE ELEVEN
                               GUARANTEE OF NOTES

                  SECTION  11.01.  Guarantee . Subject to the provisions of this
Article Eleven,  the Guarantors  hereby fully,  unconditionally  and irrevocably
guarantee  to each Holder and to the Trustee on behalf of the  Holders:  (i) the
due and punctual  payment of the principal of, premium,  if any, and interest on
each  Note,  when and as the same  shall  become  due and  payable,  whether  at
maturity, by acceleration or otherwise, the due and punctual payment of interest
on the overdue  principal of and interest,  if any, on the Notes,  to the extent
lawful,  and the due and punctual  performance  of all other  obligations of the
Company to the Holders or the Trustee,  all in accordance with the terms of such
Note and  this  Indenture  [and  (ii) in the  case of any  extension  of time of
payment or renewal of any Notes or any of such other obligations,  that the same
will be promptly paid in full when due or performed in accordance with the terms
of the extension or renewal, at Stated Maturity,  by acceleration or otherwise].
The Guarantor hereby waives diligence, presentment, demand of payment, filing of
claims with a court in the event of merger or  bankruptcy  of the  Company,  any
right to  require a  proceeding  first  against  the  Company,  the  benefit  of
discussion,  protest  or  notice  with  respect  to any  such  Note or the  debt
evidenced thereby and all demands whatsoever,  and covenants that this Guarantee
will not be  discharged  as to any such Note  except by  payment  in full of the
principal  thereof and  interest  thereon  and as  provided in Section  8.01 and
Section  8.02  (subject  to  Section  8.06).  The  maturity  of the  obligations
guaranteed hereby may be accelerated as provided in Article Six for the purposes
of this Article Eleven.  In the event of any declaration of acceleration of such
obligations as provided in Article Six, such obligations (whether or not due and
payable) shall forthwith become due and payable by the Guarantor for the purpose
of this Article Eleven. In addition,  without limiting the foregoing provisions,
upon the  effectiveness of an acceleration  under Article Six, the Trustee shall
promptly make a demand for payment on the Notes under the Guarantee provided for
in this Article Eleven.
<PAGE>

                  If the  Trustee or the Holder of any Note is  required  by any
court or otherwise to return to the Company or the Guarantor,  or any custodian,
receiver, liquidator,  trustee, sequestrator or other similar official acting in
relation to the Company or the Guarantor, any amount paid to the Trustee or such
Holder  in  respect  of a  Note,  this  Guarantee,  to  the  extent  theretofore
discharged,  shall be reinstated in full force and effect. The Guarantor further
agrees,  to the fullest  extent that it may lawfully do so, that, as between it,
on the one  hand,  and the  Holders  and the  Trustee,  on the other  hand,  the
maturity of the obligations  guaranteed hereby may be accelerated as provided in
Article Six hereof for the purposes of this Guarantee, notwithstanding any stay,
injunction  or other  prohibition  extant under any  applicable  bankruptcy  law
preventing such acceleration in respect of the obligations guaranteed hereby.

                  The  Guarantor  hereby  irrevocably  waives any claim or other
rights which it may now or hereafter acquire against the Company that arise from
the existence, payment, performance or enforcement of its obligations under this
Guarantee  and this  Indenture,  including,  without  limitation,  any  right of
subrogation,  reimbursement,  exoneration,  contribution,  indemnification,  any
right to participate  in any claim or remedy of the Holders  against the Company
or any collateral  which any such Holder or the Trustee on behalf of such Holder
hereafter acquires, whether or not such claim, remedy or right arises in equity,
or under contract,  statute or common law, including,  without  limitation,  the
right to take or receive from the Company,  directly or  indirectly,  in cash or
other  property  or by set-off or in any other  manner,  payment or  security on
account  of such  claim  or other  rights.  If any  amount  shall be paid to the
Guarantor in violation of the preceding  sentence and the principal of, premium,
if any, and accrued interest on the Notes shall not have been paid in full, such
amount  shall be deemed to have been paid to the  Guarantor  for the benefit of,
and held in trust for the benefit of, the Holders,  and shall  forthwith be paid
to the Trustee for the  benefit of the Holders to be credited  and applied  upon
the  principal  of,  premium,  if any,  and accrued  interest on the Notes.  The
Guarantor  acknowledges  that it will receive direct and indirect  benefits from
the issuance of the Notes  pursuant to this  Indenture  and that the waivers set
forth  in  this  Section  11.01  are  knowingly  made in  contemplation  of such
benefits.

                  The  Guarantee  set forth in this  Section  11.01 shall not be
valid or become  obligatory  for any  purpose  with  respect to a Note until the
certificate  of  authentication  on such Note  shall  have been  signed by or on
behalf of the Trustee.

                  SECTION 11.02. Obligations  Unconditional . Subject to Section
11.05,  nothing  contained in this Article Eleven or elsewhere in this Indenture
or in the Notes is intended to or shall  impair,  as among the Guarantor and the
holders of the Notes,  the  obligation of the  Guarantor,  which is absolute and
unconditional,  upon failure by the Company,  to pay to the holders of the Notes
the  principal  of,  premium,  if any, and interest on the Notes as and when the
same shall become due and payable in accordance with their terms, or is intended
to or shall affect the relative rights of the holders of the Notes and creditors
of the Guarantor, nor shall anything herein or therein prevent the holder of any
Notes or the Trustee on their  behalf from  exercising  all  remedies  otherwise
permitted by applicable law upon default under this Indenture.
<PAGE>

                  Without  limiting  the  foregoing,  nothing  contained in this
Article  Eleven  will  restrict  the right of the  Trustee or the holders of the
Notes to take any action to declare the Guarantee to be due and payable prior to
the Stated  Maturity  of the Notes  pursuant  to  Section  6.02 or to pursue any
rights or remedies hereunder.

                  SECTION  11.03.  Notice to Trustee . The Guarantor  shall give
prompt  written  notice to the Trustee of any fact known to the Guarantor  which
would  prohibit the making of any payment to or by the Trustee in respect of the
Guarantee pursuant to the provisions of this Article Eleven.

                  SECTION 11.04. This Article Not to Prevent Events of Default .
The failure to make a payment on account of principal  of,  premium,  if any, or
interest on the Notes by reason of any  provision  of this  Article  will not be
construed as preventing the occurrence of an Event of Default.

                  SECTION  11.05.  Net Worth  Limitation .  Notwithstanding  any
other  provision of this  Indenture  or the Notes,  the  Guarantee  shall not be
enforceable against the Guarantor in an amount in excess of the net worth of the
Guarantor at the time that  determination of such net worth is, under applicable
law,  relevant  to the  enforceability  of the  Guarantee.  Such net worth shall
include any claim of the Guarantor against the Company for reimbursement and any
claim against any grantor of a Guarantee for contribution.


                                 ARTICLE TWELVE
                                  MISCELLANEOUS

                  SECTION  12.01.  Trust  Indenture Act of 1939 . This Indenture
shall be subject to the  provisions of the TIA that are required to be a part of
this  Indenture  and  shall,  to the  extent  applicable,  be  governed  by such
provisions.


                  SECTION 12.02.  Notices . Any notice or communication shall be
sufficiently  given if in  writing  and  delivered  in person or mailed by first
class mail or telecopier  communication,  addressed as follows,  and received by
the addressee:

            if to the Company:

                     Orion Newco Services, Inc.
                     2440 Research Boulevard
                     Suite 40
                     Rockville, Maryland 20850
                     Telecopier No: (301) 258-8101
                     Attention:  [________]
<PAGE>

            with a copy to:
                     Hogan & Hartson, L.L.P.
                     Columbia Square
                     555 Thirteenth Street, N.W.
                     Washington, D.C. 20004
                     Telecopier No.:  (202) 637-5910
                     Attention:  [________]


            if to the Trustee:

                     Bankers Trust Company
                     4 Albany Street
                     Mailstop 5041
                     New York, N.Y.  10006
                     Telecopier No.:  (212) 250-6392
                     Attention:  Corporate Trustee Administration Department

            with a copy to:

                     Leboeuf, Lamb, Greene & MacRae, L.L.P.
                     125 West 55th Street
                     New York,  N.Y.  10019
                     Telecopier No.:  (212) 424-8500
                     Attention:  Joan Monahan

                  The Company,  the Trustee or the  Depositary  by notice to the
other may designate  additional or different addresses for subsequent notices or
communications.

                  Any  notice  or   communication   mailed  to  a  Holder  of  a
Certificated  Note  shall be mailed to him at his  address  as it appears on the
Register by first class mail and shall be sufficiently given to him if so mailed
within  the time  prescribed.  Copies of any such  communication  or notice to a
Holder shall also be mailed to the Trustee and each Agent at the same time.

                  Failure  to mail a notice  or  communication  to a  Holder  as
provided  herein or any  defect  in it shall not  affect  its  sufficiency  with
respect to other  Holders.  Except for a notice to the Trustee,  which is deemed
given only when received, and except as otherwise provided in this Indenture, if
a notice or  communication  is mailed in the  manner  provided  in this  Section
12.02, it is duly given, whether or not the addressee receives it.

                  Where this Indenture  provides for notice in any manner,  such
notice may be waived in writing by the Person  entitled to receive  such notice,
either  before or after the event,  and such waiver shall be the  equivalent  of
such notice.  Waivers of notice by Holders shall be filed with the Trustee,  but
such filing  shall not be a condition  precedent  to the  validity of any action
taken in reliance upon such waiver.
<PAGE>

                  In case by reason of the suspension of regular mail service or
by reason of any other  cause it shall be  impracticable  to give such notice by
mail,  then such  notification as shall be made with the approval of the Trustee
shall constitute a sufficient notification for every purpose hereunder.

                  SECTION  12.03.  Certificate  and  Opinion  as  to  Conditions
Precedent  . Upon any  request or  application  by the Company to the Trustee to
take any action under this Indenture, the Company shall furnish to the Trustee:

                  (a) an Officers'  Certificate  stating that, in the opinion of
         the signers,  all conditions  precedent,  if any,  provided for in this
         Indenture relating to the proposed action have been complied with; and

                  (b) an Opinion of Counsel stating that, in the opinion of such
         counsel, all such conditions precedent have been complied with.

                  SECTION 12.04. Statements Required in Certificate or Opinion .
Each  certificate  or opinion  with  respect to  compliance  with a condition or
covenant provided for in this Indenture shall include:

                  (a) a statement that each person  signing such  certificate or
         opinion has read such covenant or condition and the definitions  herein
         relating thereto;

                  (b) a  brief  statement  as to the  nature  and  scope  of the
         examination  or  investigation  upon  which the  statement  or  opinion
         contained in such certificate or opinion is based;

                  (c) a statement  that, in the opinion of each such person,  he
         has made such  examination or  investigation  as is necessary to enable
         him to express an informed  opinion as to whether or not such  covenant
         or condition has been complied with; and

                  (d) a  statement  as to whether or not, in the opinion of each
         such  person,  such  condition  or  covenant  has been  complied  with;
         provided, however, that, with respect to matters of fact, an Opinion of
         Counsel may rely on an Officers'  Certificate or certificates of public
         officials.

                  SECTION  12.05.  Acts of  Holders . (a) Any  request,  demand,
authorization,  direction,  notice,  consent, waiver or other action provided by
this  Indenture to be given or taken by Holders may be embodied in and evidenced
by one or more instruments of substantially similar tenor signed by such Holders
in  person or by an agent  duly  appointed  in  writing;  and,  except as herein
otherwise  expressly  provided,  such action  shall become  effective  when such
instrument or  instruments  are delivered to the Trustee and, where it is hereby
expressly required, to the Company. Proof of execution of any such instrument or
of a writing  appointing  any such agent shall be sufficient  for any purpose of
this Indenture and  conclusive in favor of the Trustee and the Company,  if made
in the manner provided in this Section 10.05.
<PAGE>

                  (b) The ownership of Notes shall be proved by the Register.

                  (c) Any request,  demand,  authorization,  direction,  notice,
consent,  waiver or other  action by the  Holder of any Note  shall  bind  every
future  Holder of the same  Note or the  Holder of every  Note  issued  upon the
transfer  thereof or in  exchange  therefor  or in lieu  thereof,  in respect of
anything done,  suffered or omitted to be done by the Trustee,  any Paying Agent
or the Company in reliance  thereon,  whether or not  notation of such action is
made upon such Note.

                  (d) If the Company shall solicit from the Holders any request,
demand,  authorization,  direction,  notice,  consent,  waiver of other act, the
Company may, at its option, by or pursuant to a Board Resolution, fix in advance
a record  date for the  determination  of such  Holders  entitled  to give  such
request, demand, authorization, direction, notice, consent, waiver or other act,
but  the  Company  shall  have no  obligation  to do so.  Notwithstanding  Trust
Indenture  Act  Section  316(c),  any such  record date shall be the record date
specified  in or  pursuant to such Board  Resolution,  which shall be a date not
more than 30 days  prior to the  first  solicitation  of  Holders  generally  in
connection therewith and no later than the date such solicitation is completed.

                  If  such  a  record  date  is  fixed,  such  request,  demand,
authorization,  direction,  notice,  consent,  waiver  or other act may be given
before or after such record date, but only the Holders of record at the close of
business  on such  record  date shall be deemed to be Holders  for  purposes  of
determining   whether  Holders  of  the  requisite   proportion  of  Notes  then
outstanding  have  authorized  or agreed or consented to such  request,  demand,
authorization,  direction,  notice,  consent,  waiver or other act, and for this
purpose the Notes then  outstanding  shall be  computed as of such record  date;
provided  that  no  such  request,  demand,  authorization,  direction,  notice,
consent,  waiver or other act by the Holders on such record date shall be deemed
effective  unless it shall become  effective  pursuant to the provisions of this
Indenture not later than six months after the record date.

                  SECTION  12.06.  Rules by Trustee,  Paying Agent or Registrar.
The Trustee may make reasonable  rules for action by or at a meeting of Holders.
The Paying Agent or Registrar may make reasonable rules for its functions.

                  SECTION 12.07. Agent for Service;  Submission to Jurisdiction;
Waiver of Immunities . By the execution and delivery of this Indenture,  each of
the  Company and the  Guarantor  (i)  acknowledges  that it has  designated  and
appointed [______],  as its authorized agent upon which process may be served in
any suit,  action or proceeding  arising out of or relating to the Notes or this
Indenture  that may be  instituted in any federal or state court in the State of
New York,  Borough of Manhattan,  or brought  under federal or state  securities
laws or brought by the  Trustee  (whether in its  individual  capacity or in its
capacity as Trustee hereunder), and acknowledges that [______] has accepted such
designation, (ii) submits to the non-exclusive jurisdiction of any such court in
any such suit,  action or  proceeding,  and (iii) agrees that service of process
upon  [______]  and written  notice of said  service to the  Company  (mailed or
delivered to its General Counsel at its principal office as specified in 


<PAGE>

Section  12.02) shall be deemed in every  respect  effective  service of process
upon it in any such suit or proceeding.  The Company  further agrees to take any
and all action, including the execution and filing of any and all such documents
and instruments as may be necessary to continue such designation and appointment
of [______] in full force and effect so long as this Indenture  shall be in full
force and effect or any of the Notes shall be outstanding.

                  To the extent that the Company  has or  hereafter  may acquire
any immunity from  jurisdiction of any court or from any legal process  (whether
through service of notice,  attachment  prior to judgment,  attachment in aid of
execution,  execution or otherwise) with respect to itself or its property,  the
Company hereby  irrevocably  waives such immunity in respect of its  obligations
under this Indenture and the Notes, to the extent permitted by law.

                  SECTION 12.08.  Payment Date Other Than a Business Day . If an
Interest Payment Date,  Redemption Date,  Payment Date or Stated Maturity of any
Note shall not be a Business Day, then payment of principal of, premium, if any,
or interest on such Note, as the case may be, need not be made on such date, but
may be made on the next  succeeding  Business Day with the same force and effect
as if made on the Interest Payment Date,  Payment Date or Redemption Date, or at
the Stated Maturity of such Note, provided that no interest shall accrue for the
period from and after such Interest Payment Date, Payment Date,  Redemption Date
or Stated Maturity, as the case may be.

                  SECTION  12.09.  Governing Law . This  Indenture and the Notes
shall be  governed  by the laws of the  State of [New  York]  excluding  (to the
greatest  extent  permissible  by law)  any  rule of law that  would  cause  the
application of the laws of any jurisdiction other than the State of [New York].

                  SECTION 12.10. No Adverse Interpretation of Other Agreements .
This  Indenture  may not be used to interpret  another  indenture,  loan or debt
agreement of the Company or any Subsidiary of the Company.  Any such  indenture,
loan or debt agreement may not be used to interpret this Indenture.

                  SECTION  12.11.  No Recourse  Against Others . No recourse for
the  payment of the  principal  of,  premium,  if any, or interest on any of the
Notes,  or for any claim based thereon or otherwise in respect  thereof,  and no
recourse  under or upon any  obligation,  covenant or  agreement  of the Company
contained in this  Indenture,  the Pledge  Agreement or in any of the Notes,  or
because of the creation of any Indebtedness  represented  thereby,  shall be had
against  any  incorporator,   stockholder,   officer,   director,   employee  or
controlling person, as such, of the Company or the Guarantor or of any successor
Person thereof,  either directly or through the Company or any successor Person,
whether  by  virtue  of any  constitution,  statute  or rule  of law,  or by the
enforcement  of any  assessment  or penalty  or  otherwise;  it being  expressly
understood that all such liability is hereby  expressly waived and released as a
condition of, and as a consideration  for, the execution of this Indenture,  the
Pledge Agreement and the issue of the Notes.
<PAGE>

                  SECTION  12.12.  Successors . All agreements of the Company in
this  Indenture and the Notes shall bind its  successors.  All agreements of the
Trustee in this Indenture shall bind its successors.

                  SECTION 12.13.  Duplicate Originals . The parties may sign any
number of copies of this Indenture.  Each signed copy shall be an original,  but
all of them together represent the same agreement.

                  SECTION  12.14.  Separability  . In case any provision in this
Indenture  or in the Notes  shall be  invalid,  illegal  or  unenforceable,  the
validity,  legality and enforceability of the remaining  provisions shall not in
any way be affected or impaired thereby.

                  SECTION 12.15. Table of Contents,  Headings, Etc. The Table of
Contents,  Cross-Reference  Table and  headings of the  Articles and Sections of
this Indenture have been inserted for  convenience of reference only, are not to
be  considered  a part hereof and shall in no way modify or restrict  any of the
terms and provisions hereof.


<PAGE>



                                   SIGNATURES

                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Indenture to be duly executed, all as of the date first written above.



ORION NEWCO SERVICES, INC.                 BANKERS TRUST COMPANY

By:_____________________________           By:____________________________

Name: __________________________           Name:__________________________

Title:__________________________           Title:_________________________

ORION NETWORK SYSTEMS, INC.                ORION SATELLITE CORPORATION

By:_____________________________           By:____________________________

Name: __________________________           Name:__________________________

Title:__________________________           Title:_________________________

ORIONNET, INC.                             ORION ATLANTIC EUROPE, INC.

By:_____________________________           By:____________________________

Name: __________________________           Name:__________________________

Title:__________________________           Title:_________________________

ORION ASIA PACIFIC CORPORATION             ORIONNET FINANCE CORPORATION


By:_____________________________           By:____________________________

Name: __________________________           Name:__________________________

Title:__________________________           Title:_________________________

ASIA PACIFIC SPACE AND                     INTERNATIONAL PRIVATE
SATELLITE COMMUNICATIONS, LTD.             PARTNERS, L.P.

By:_____________________________           By:____________________________

Name: __________________________           Name:__________________________

Title:__________________________           Title:_________________________


<PAGE>









EXHIBIT A

                               FORM OF GLOBAL NOTE

                                 [FACE OF NOTE]


THE NOTES  EVIDENCED  BY THIS  CERTIFICATE  ARE  INITIALLY  ISSUED AS PART OF AN
ISSUANCE OF UNITS, EACH OF WHICH CONSISTS OF ONE NOTE WITH A PRINCIPAL AMOUNT AT
MATURITY  OF [ ] AND ONE  WARRANT  INITIALLY  ENTITLING  THE  HOLDER  THEREOF TO
PURCHASE [ ] SHARES OF COMMON  STOCK,  PAR VALUE $.01 PER SHARE,  OF ORION NEWCO
SERVICES,  INC.  (THE "COMMON  STOCK").  PRIOR TO THE CLOSE OF BUSINESS UPON THE
EARLIEST TO OCCUR OF (i) [ ], 1997,  (ii) SUCH DATE AS THE  UNDERWRITES  MAY, IN
THEIR DISCRETION DEEM APPROPRIATE OR (iii) IN THE EVENT OF AN OFFER TO PURCHASE,
THE DATE THE COMPANY MAILS NOTICE THEREOF TO THE HOLDERS OF THE NOTES, THE NOTES
EVIDENCED BY THIS  CERTIFICATE  MAY NOT BE TRANSFERRED  OR EXCHANGED  SEPARATELY
FROM, BUT MAY BE TRANSFERRED OR EXCHANGED ONLY TOGETHER WITH, THE WARRANTS.

THIS NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE  GOVERNING THIS
NOTE) IN CUSTODY FOR THE BENEFIT OF THE  BENEFICIAL  OWNERS  HEREOF,  AND IS NOT
TRANSFERABLE TO ANY PERSON UNDER ANY  CIRCUMSTANCES  EXCEPT THAT (I) THIS GLOBAL
NOTE MAY BE  EXCHANGED IN WHOLE BUT NOT IN PART  PURSUANT TO SECTION  2.07(a) OF
THE  INDENTURE,  (II) THIS  GLOBAL  NOTE MAY BE  DELIVERED  TO THE  TRUSTEE  FOR
CANCELLATION  PURSUANT TO SECTION  2.12 OF THE  INDENTURE  AND (III) THIS GLOBAL
NOTE MAY BE TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT
OF ORION NEWCO SERVICES, INC.




<PAGE>



                           ORION NEWCO SERVICES, INC.

                          [___]% Senior Note Due 2007

                                                               CUSIP [ ________]

No.  __________


                  Issue Date:  ______________________


                  ORION  NEWCO  SERVICES,  INC.,  a Delaware  corporation,  with
registration number [_______] (the "Company",  which term includes any successor
under the Indenture  hereinafter  referred to), for value received,  promises to
pay   to   the   bearer   upon   surrender   hereof   the   principal   sum   of
_________________________________  United States Dollars (U.S.$________________)
on 2007.

Interest Payment Dates:  [                    ] and [         ], commencing [  ]
1997.

                  Reference  is hereby  made to the further  provisions  of this
Note set forth on the  reverse  hereof,  which  provisions  shall  have the same
effect as if set forth hereon.




<PAGE>



                  IN WITNESS  WHEREOF,  the  Company  has caused this Note to be
signed manually or by facsimile by its duly authorized officer.


Date:                             ORION NEWCO SERVICES, INC.


                                  By:____________________________

                                  Name:__________________________

                                  Title:_________________________

This  is  one  of  the  [___]%   Senior   Notes  due  2007   described   in  the
within-mentioned Indenture.

                                    BANKERS TRUST COMPANY,
                                    as Trustee


                                    By: _______________________________
                                         Authorized Officer


<PAGE>



                             [REVERSE SIDE OF NOTE]

                           ORION NEWCO SERVICES, INC.

                           [___]% Senior Note due 2007


1.  Principal and Interest.

                  Orion  Newco  Services,  Inc.  (the  "Company")  will  pay the
principal of this Note on [                    ], 2007. 

                  The Company  promises to pay interest on the principal  amount
of this Note on each Interest  Payment Date, as set forth below, at the rate per
annum shown above.

                  Interest on the Notes  shall  accrue at the rate of [___]% per
annum  (the  "Interest  Rate")  and shall be  payable  in U.S.  dollars  in cash
semi-annually  in  arrears  on [ ] and [ ] (each an  "Interest  Payment  Date");
provided that the first  Interest  Payment Date shall be [ ], 1997.  Interest on
the Notes will accrue from the most recent date to which  interest has been paid
or duly provided for, or if no interest has been paid or duly provided for, from
the date of original issuance hereof.  Interest will be computed on the basis of
a 360-day year comprised of twelve 30-day months.

                  The  Company  shall pay  interest  on  overdue  principal  and
premium, if any, and (to the extent lawful) interest on overdue  installments of
interest at the rate of [___]% per annum.


2.  Method of Payment.

                  The Company will pay interest and principal to the Depositary,
with  respect to any Global Note held by the  Depositary.  The Company  will pay
principal,  premium,  if any,  and  interest  in money of the  United  States of
America  that at the time of payment is legal  tender for  payment of public and
private  debts.  However,  the Company may pay principal,  premium,  if any, and
interest by check payable in such money.  If a payment date is a date other than
a Business  Day at a place of payment,  payment may be made at that place on the
next  succeeding day that is a Business Day and no interest shall accrue for the
intervening period.


3.  Paying Agent and Registrar.

                  Initially, the Trustee will act as Paying Agent and Registrar.
The  Company  may  change  any  Paying  Agent and  Registrar  without  notice in
accordance  with the  Indenture.  The Company,  any Affiliate or any  Subsidiary
thereof may act as the Paying Agent or Registrar.

4.  Indenture; Limitations.

<PAGE>

                  The Company  issued the Notes under an  Indenture  dated as of
[__________],  1997  (the  "Indenture"),  between  the  Company,  Orion  Network
Systems,  Inc., Orion Satellite  Corporation,  International  Private  Satellite
Partners,  L.P., OrionNet,  Inc., Orion Asia Pacific  Corporation,  Asia Pacific
Space and Communications, Ltd., Orion Atlantic Europe, Inc. and OrionNet Finance
Corporation,  as  guarantors,  and the Bankers  Trust  Company,  as trustee (the
"Trustee"). Capitalized terms herein are used as defined in the Indenture unless
otherwise  indicated.  The  terms  of the  Notes  include  those  stated  in the
Indenture  and  those  made  part of the  Indenture  by  reference  to the Trust
Indenture Act. The Notes are subject to all such terms, and Holders are referred
to the Indenture and the Trust  Indenture Act for a statement of all such terms.
To the extent  permitted by  applicable  law, in the event of any  inconsistency
between the terms of this Note and the terms of the Indenture,  the terms of the
Indenture shall control.

                  The Notes are unsecured  senior  indebtedness  of the Company.
The Indenture limits the aggregate principal amount of the Notes to $[ ].

5.  Optional Redemption.

                  The Notes will be  redeemable,  at the  Company's  option,  in
whole or in part,  at any  time or from  time to time on or after [ ],  2002 and
prior to maturity, upon not less than 30 nor more than 60 days' prior notice, at
the following  Redemption  Prices  (expressed in percentages of their  principal
amount),  plus accrued and unpaid  interest,  if any, to the Redemption  Date if
redeemed during the 12-month period commencing on October [__] of the applicable
years set forth below:

                  Year                               Redemption Price

                  2002                                      [_____]%
                  2003                                      [_____]%
                  2004 and thereafter                       100.000%


6.  Selection of Notes for Partial Redemption; Effect of Redemption Notice.

                  In the case of any partial redemption,  selection of the Notes
for redemption will be made by the Trustee in compliance  with the  requirements
of the principal national  securities  exchange,  if any, on which the Notes are
listed or, if the Notes are not listed on a national securities  exchange,  on a
pro rata basis,  by lot or by such method as the Trustee in its sole  discretion
shall  deem to be fair  and  appropriate;  provided  that no Note of  $1,000  in
principal  amount  or less  shall  be  redeemed  in  part.  If any Note is to be
redeemed  in part only,  the notice of  redemption  relating  to such Note shall
state the portion of the principal amount thereof to be redeemed.  A new Note in
principal  amount equal to the unredeemed  portion thereof will be issued in the
name of the Holder  thereof upon  cancellation  of the original  Note.  Upon the
giving of any redemption  notice,  interest on Notes called for redemption  will
cease to accrue from and after the date fixed for redemption (unless the Company
defaults in providing  the funds for such  redemption)  and such Notes will then
cease to be outstanding.
<PAGE>

7.  Notice of Redemption.

                  Notice of any optional  redemption  will be mailed at least 30
days but not more than 60 days  before  the  Redemption  Date to the  Holders of
Notes to be redeemed at such  Holder's  registered  address as it appears in the
Register.

8. Repurchase upon Change of  Control.

                  Upon the occurrence of any Change of Control, the Company will
be obligated to make an offer to purchase all outstanding  Notes pursuant to the
Offer to Purchase  described in the Indenture at a purchase  price equal to 101%
of the aggregate  principal amount thereof plus accrued and unpaid interest,  if
any, to the date of purchase (the "Change of Control Payment").

                  A notice of such  Change of Control  will be mailed  within 30
days after any Change of Control occurs to each Holder of Notes at such Holder's
registered   address  as  it  appears  in  the   Register.   Notes  in  original
denominations  larger than  $1,000 may be sold to the Company in part;  provided
that Notes will only be issued in  denominations  of $1,000  principal amount at
maturity or integral multiples thereof.  On and after the Payment Date, interest
ceases to accrue on Notes or portions of Notes  surrendered  for purchase by the
Company,  unless the  Company  defaults  in the payment of the Change of Control
Payment.

9.  Denomination.

                  This Global Note is in fully  registered  form without coupons
and is denominated in an amount equal to $1,000 of principal  amount at maturity
or an integral multiple thereof and is transferable by delivery.  This Note is a
Global Note.

10.  Persons Deemed Owners.

                  The  holder of this Note shall be treated as the owner of this
Note for all purposes.

11.  Unclaimed Money.

                  If money for the payment of  principal,  premium,  if any, and
interest remains  unclaimed for two years, the Trustee and the Paying Agent will
pay the money back to the Company at its request.  After that,  Holders entitled
to the money must look to the  Company for  payment,  unless an  applicable  law
designates  another  Person,  and all  liability  of the Trustee and such Paying
Agent with respect to such money shall cease.

12.  Discharge Prior to Redemption or Maturity.

                  If the  Company  deposits  with  the  Trustee  money  or  U.S.
Government  Obligations  sufficient  to pay the then  outstanding  principal of,
premium,  if any, and accrued  interest on the Notes (a) to redemption or Stated
Maturity,  the Company  will be  discharged  from the  Indenture


<PAGE>

and the Notes, except in certain  circumstances for certain sections thereof, or
(b) the Company  will be  discharged  from  certain  covenants  set forth in the
Indenture.

13.  Amendment; Supplement; Waiver.

                  Subject to certain exceptions,  the Indenture or the Notes may
be  amended  or  supplemented  with the  consent  of the  Holders  of at least a
majority in aggregate  principal amount of the Notes then  outstanding,  and any
existing default or compliance with any provision may be waived with the consent
of the Holders of at least a majority in aggregate principal amount of the Notes
then  outstanding.  Without notice to or the consent of any Holder,  the parties
thereto  may amend or  supplement  the  Indenture  or the Notes to,  among other
things,  cure any ambiguity,  defect or  inconsistency  and make any change that
does not materially and adversely affect the rights of any Holder.

14.  Restrictive Covenants.

                  The Indenture  imposes  certain  limitations on the ability of
the Company  and the  Restricted  Subsidiaries,  among  other  things,  to Incur
additional  Indebtedness;  create Liens; pay dividends or make  distributions in
respect  of  their  Capital  Stock;  make  Investments  or  make  certain  other
Restricted  Payments;  engage in Asset Sales;  issue or sell stock of Restricted
Subsidiaries;  enter into transactions with stockholders or Affiliates; or, with
respect to the Company,  consolidate,  merge or sell all or substantially all of
its  assets.  Within 90 days  after the end of the last  fiscal  quarter of each
year,  the  Company  must  report  to  the  Trustee  on  compliance   with  such
limitations.

15.  Successor Persons.

                  Generally, when a successor person or other entity assumes all
the  obligations  of its  predecessor  under the Notes  and the  Indenture,  the
predecessor person will be released from those obligations.

16.  Defaults and Remedies.

                  The following events will be defined as "Events of Default" in
the Indenture:  (a) default in the payment of principal of (or premium,  if any,
on)  any  Note  when  the  same  becomes  due  and  payable  at  maturity,  upon
acceleration, redemption or otherwise; (b) default in the payment of interest on
any Note when the same becomes due and payable, and such default continues for a
period  of 30  days;  provided  that a  failure  to make  any of the  first  six
scheduled  interest  payments on the Notes in a timely manner will constitute an
Event of Default with no grace or cure period;  (c) defaults in the  performance
or breach of the  provisions  of Section 5.01 of the Indenture or the failure to
make or  consummate  an Offer to Purchase in  accordance  with  Section  4.11 or
Section 4.13 of the Indenture; (d) the Company defaults in the performance of or
breaches  any other  covenant or  agreement  of the Company in the  Indenture or
under the Notes (other than a default specified in clause (a), (b) or (c) above)
and such default or breach  continues for a period of 30 consecutive  days after
written  notice  by the  Trustee  or the  Holders  of 25% or 


<PAGE>

more in aggregate  principal  amount at maturity of the Notes;  (e) there occurs
with  respect  to any issue or  issues of  Indebtedness  of the  Company  or any
Significant  Subsidiary having an outstanding principal amount of $10 million or
more in the  aggregate  for all such issues of all such  Persons,  whether  such
Indebtedness  now exists or shall hereafter be created,  (I) an event of default
that has caused the holder  thereof to declare such  Indebtedness  to be due and
payable  prior  to its  Stated  Maturity  and  such  Indebtedness  has not  been
discharged  in full or such  acceleration  has not been  rescinded  or  annulled
within 30 days of such acceleration  and/or (II) the failure to make a principal
payment at the final (but not any interim)  fixed  maturity  and such  defaulted
payment  shall not have been  made,  waived or  extended  within 30 days of such
payment default;  (f) any final judgment or order (not covered by insurance) for
the  payment  of money in excess of $10  million in the  aggregate  for all such
final  judgments or orders against all such Persons  (treating any  deductibles,
self-insurance  or  retention as not so covered)  shall be rendered  against the
Company or any Significant  Subsidiary and shall not be paid or discharged,  and
there shall be any period of 30 consecutive  days  following  entry of the final
judgment or order that causes the aggregate  amount for all such final judgments
or orders  outstanding  and not paid or  discharged  against all such Persons to
exceed $10 million  during which a stay of enforcement of such final judgment or
order, by reason of a pending appeal or otherwise, shall not be in effect; (g) a
court  having  jurisdiction  in the  premises  enters a decree  or order for (A)
relief in respect of the Company or any Significant Subsidiary in an involuntary
case under any  applicable  bankruptcy,  insolvency  or other similar law now or
hereafter  in effect,  (B)  appointment  of a  receiver,  liquidator,  assignee,
custodian,  trustee,  sequestrator  or similar  official  of the  Company or any
Significant  Subsidiary  or for all or  substantially  all of the  property  and
assets of the  Company or any  Significant  Subsidiary  or (C) the winding up or
liquidation of the affairs of the Company or any Significant  Subsidiary and, in
each case, such decree or order shall remain unstayed and in effect for a period
of 30  consecutive  days; or (h) the Company or any  Significant  Subsidiary (A)
commences a voluntary case under any applicable bankruptcy,  insolvency or other
similar law now or hereafter in effect, or consents to the entry of an order for
relief  in an  involuntary  case  under  any  such  law,  (B)  consents  to  the
appointment  of  or  taking  possession  by a  receiver,  liquidator,  assignee,
custodian,  trustee,  sequestrator  or similar  official  of the  Company or any
Significant  Subsidiary  or for all or  substantially  all of the  property  and
assets of the Company or any  Significant  Subsidiary or (C) effects any general
assignment for the benefit of creditors.

                  If an  Event  of  Default  (other  than an  Event  of  Default
specified  in clause (g) or (h) above that occurs with  respect to the  Company)
occurs and is continuing  under the Indenture,  the Trustee or the Holders of at
least 25% in aggregate  principal amount  outstanding,  by written notice to the
Company  (and to the Trustee if such notice is given by the  Holders),  may, and
the Trustee at the request of such Holders shall,  declare the principal  amount
of, premium, if any, and accrued interest on the Notes to be immediately due and
payable. Upon a declaration of acceleration,  such principal amount of, premium,
if any, and accrued interest shall be immediately due and payable.  In the event
of a declaration of acceleration because an Event of Default set forth in clause
(e) above has occurred and is continuing, such declaration of acceleration shall
be automatically  rescinded and annulled if the event of default triggering such
Event of  Default  pursuant  to  clause  (e) shall be  remedied  or cured by the
Company or the relevant  Significant  Subsidiary or waived by the holders of the
relevant  Indebtedness within 60 days after the declaration of acceleration with
respect  thereto.  If an Event of Default  specified  in clause (g) or 


<PAGE>

(h) above occurs with respect to the Company,  the principal amount of, premium,
if any,  and  accrued  interest on the Notes then  outstanding  shall ipso facto
become and be immediately  due and payable  without any declaration or other act
on the part of the Trustee or any Holder.  The Holders of at least a majority in
principal  amount at maturity of the outstanding  Notes by written notice to the
Company and to the Trustee,  may waive all past defaults and rescind and annul a
declaration of acceleration  and its  consequences if (i) all existing Events of
Default,  other than the  nonpayment of the principal of,  premium,  if any, and
interest  on the Notes  that have  become  due  solely  by such  declaration  of
acceleration,  have  been  cured or  waived  and (ii) the  rescission  would not
conflict with any judgment or decree of a court of competent jurisdiction.

                  The  Holders of at least a  majority  in  aggregate  principal
amount at  maturity  of the  outstanding  Notes may direct the time,  method and
place of conducting any  proceeding  for any remedy  available to the Trustee or
exercising any trust or power conferred on the Trustee. However, the Trustee may
refuse to follow any direction that  conflicts  with law or the Indenture,  that
may involve the Trustee in personal liability, or that the Trustee determines in
good  faith may be unduly  prejudicial  to the  rights of  Holders  of Notes not
joining in the giving of such  direction  and may take any other action it deems
proper that is not inconsistent with any such direction received from Holders of
Notes.  A Holder may not pursue any remedy with respect to the  Indenture or the
Notes unless:  (i) the Holder gives the Trustee  written  notice of a continuing
Event of Default; (ii) the Holders of at least 25% in aggregate principal amount
at maturity of outstanding Notes make a written request to the Trustee to pursue
the  remedy;   (iii)  such  Holder  or  Holders  offer  the  Trustee   indemnity
satisfactory  to the Trustee against any costs,  liability or expense;  (iv) the
Trustee  does not comply  with the request  within 60 days after  receipt of the
request  and the offer of  indemnity;  and (v) during such  60-day  period,  the
Holders  of a  majority  in  aggregate  principal  amount  at  maturity  of  the
outstanding  Notes do not give the Trustee a direction that is inconsistent with
the request.  However,  such limitations do not apply to the right of any Holder
of a Note to receive payment of the principal of,  premium,  if any, or interest
on, such Note or to bring suit for the  enforcement  of any such payment,  on or
after the due date expressed in the Notes,  which right shall not be impaired or
affected without the consent of the Holder.

17.  Trustee Dealings with Company.

                  The Trustee  under the  Indenture,  in its  individual  or any
other capacity, may become owner or pledgee of Notes and may otherwise deal with
the Company or its Affiliates  with the same rights it would have if it were not
the Trustee.

18.  No Recourse Against Others.

                  No recourse for the payment of the principal of,  premium,  if
any, or interest on any of the Notes or for any claim based thereon or otherwise
in respect  thereof,  and no recourse under or upon any obligation,  covenant or
agreement of the Company in the Indenture,  or in any of the Notes or because of
the creation of any Indebtedness  represented thereby,  shall be had against any
incorporator,  stockholder, officer, director, employee or controlling person of
the 


<PAGE>

Company or of any successor Person thereof. Each Holder, by accepting the Notes,
waives and releases all such liability.

19.  Authentication.

                  This  Note   shall  not  be  valid   until  the   Trustee   or
authenticating  agent signs the certificate of  authentication on the other side
of this Note.

20.  CUSIP Numbers.

                  Pursuant to a  recommendation  promulgated by the Committee on
Uniform Security Identification Procedures, the Company has caused CUSIP numbers
to be printed on the Notes and the Trustee  may use CUSIP  numbers in notices of
redemption  as a convenience  to Holders.  No  representation  is made as to the
accuracy of such  numbers  either as printed on the Notes or as contained in any
notice of redemption and reliance may be placed only on the other identification
numbers placed thereon.

                  The  internal  laws of the State of New York shall govern this
Note without regard to principles of conflict of laws.

                  The Company will  furnish to any Holder upon  written  request
and without charge a copy of the Indenture.  Requests may be made to Orion Newco
Services,  Inc., 2440 Research Boulevard,  Suite 40, Rockville,  Maryland 20850,
Attention: [____________].





<PAGE>



                                   SCHEDULE A

                  SCHEDULE OF PRINCIPAL AMOUNT OF INDEBTEDNESS
                             EVIDENCED BY THIS NOTE


                  The initial principal amount of indebtedness evidenced by this
Note shall be  $__,__,__.  The  following  decreases/increases  in the principal
amount evidenced by this Note have been made:

<TABLE>
<CAPTION>
                    Decrease in       Increase in      Total Principal Amount of
                    Principal         Principal        this Global Note Following    Notation Made
Date of Decrease/   Amount of this    Amount of this   such Decrease/Increase        by or on
Increase            Global Note       Global Note                                    Behalf of
                                                                                     Trustee
<S>                 <C>



















</TABLE>
<PAGE>



                       OPTION OF HOLDER TO ELECT PURCHASE


                  If you  wish  to  have  this  Note  purchased  by the  Company
pursuant to Section 4.11 or Section 4.13 of the Indenture, check the box:

                  If you wish to have a portion  of this Note  purchased  by the
Company  pursuant to Section  4.11 or Section 4.13 of the  Indenture,  state the
amount (in principal amount):
$___________________ ($1000 or integral multiple thereof).

Date:________________________

Your Signature:_________________________________________________________________


Signature Guarantee:  ______________________________




<PAGE>




                                                                       EXHIBIT B

                            FORM OF CERTIFICATED NOTE

                                 [FACE OF NOTE]


THE NOTES  EVIDENCED  BY THIS  CERTIFICATE  ARE  INITIALLY  ISSUED AS PART OF AN
ISSUANCE OF UNITS, EACH OF WHICH CONSISTS OF ONE NOTE WITH AMOUNT AT MATURITY OF
$[____] AND ONE WARRANT  INITIALLY  ENTITLING THE HOLDER  THEREOF TO PURCHASE AN
EQUAL NUMBER OF SHARES OF COMMON STOCK, PAR VALUE $.01 PER SHARE, OF ORION NEWCO
SERVICES,  INC.  (THE "COMMON  STOCK").  PRIOR TO THE CLOSE OF BUSINESS UPON THE
EARLIEST TO OCCUR OF (i) [ ], 1997,  (ii) SUCH DATE AS THE  UNDERWRITES  MAY, IN
THEIR DISCRETION DEEM APPROPRIATE OR (iii) IN THE EVENT OF AN OFFER TO PURCHASE,
THE DATE THE COMPANY MAILS NOTICE THEREOF TO THE HOLDERS OF THE NOTES, THE NOTES
EVIDENCED BY THIS  CERTIFICATE  MAY NOT BE TRANSFERRED  OR EXCHANGED  SEPARATELY
FROM, BUT MAY BE TRANSFERRED OR EXCHANGED ONLY TOGETHER WITH, THE WARRANTS.




<PAGE>



                           ORION NEWCO SERVICES, INC.

                           [___]% Senior Note Due 2007

                                                               CUSIP [ ________]
No.  __________


         Issue Date:        ______________________


         ORION NEWCO SERVICES,  INC., a Delaware corporation,  with registration
number  [_______] (the  "Company",  which term includes any successor  under the
Indenture  hereinafter referred to), for value received,  promises to pay to the
bearer     upon      surrender      hereof     the      principal     sum     of
_________________________________  United States Dollars (U.S.$________________)
on 2007.

         Interest Payment Dates:    [       ] and [  ], commencing [   ] 1997.

         Reference  is hereby  made to the further  provisions  of this Note set
forth on the reverse hereof,  which  provisions shall have the same effect as if
set forth hereon.




<PAGE>



                  IN WITNESS  WHEREOF,  the  Company  has caused this Note to be
signed manually or by facsimile by its duly authorized officer.

Date:                             ORION NEWCO SERVICES, INC.

                                  By:____________________________

                                  Name:__________________________

                                  Title:_________________________

This  is  one  of  the  [___]%   Senior   Notes  due  2007   described   in  the
within-mentioned Indenture.

                                   BANKERS TRUST COMPANY,
                                   as Trustee


                                   By:____________________________
                                        Authorized Officer


<PAGE>



                             [REVERSE SIDE OF NOTE]

                           ORION NEWCO SERVICES, INC.

                           [___]% Senior Note due 2007


1.  Principal and Interest.

                  Orion  Newco  Services,  Inc.  (the  "Company")  will  pay the
principal of this Note on [______________], 2007.

                  The Company  promises to pay interest on the principal  amount
of this Note on each Interest  Payment Date, as set forth below, at the rate per
annum shown above.

                  Interest on the Notes  shall  accrue at the rate of [___]% per
annum  (the  "Interest  Rate")  and shall be  payable  in U.S.  dollars  in cash
semi-annually  in  arrears  on [ ] and [ ] (each an  "Interest  Payment  Date");
provided that the first  Interest  Payment Date shall be [ ], 2002.  Interest on
the Notes will accrue from the most recent date to which  interest has been paid
or duly provided for, or if no interest has been paid or duly provided for, from
the date of original issuance hereof.  Interest will be computed on the basis of
a 360-day year comprised of twelve 30-day months.

                  The  Company  shall pay  interest  on  overdue  principal  and
premium, if any, and (to the extent lawful) interest on overdue  installments of
interest at the rate of [___]% per annum.


2.  Method of Payment.

                  The  Company  will pay  interest on the Notes to the Holder of
this  Note upon  presentment  hereof at the  office of the  Paying  Agent of the
Company maintained for that purpose in the Borough of Manhattan, the City of New
York.  Holders must  surrender  Notes to such Paying Agent to collect  principal
payments. The Company will pay principal, premium, if any, and interest in money
of the United  States of America that at the time of payment is legal tender for
payment of public and private  debts.  However,  the Company may pay  principal,
premium,  if any, and interest by check payable in such money. If a payment date
is a date other than a Business  Day at a place of payment,  payment may be made
at that place on the next  succeeding day that is a Business Day and no interest
shall accrue for the intervening period.


3.  Paying Agent and Registrar.

                  Initially, the Trustee will act as Paying Agent and Registrar.
The  Company  may  change  any  Paying  Agent and  Registrar  without  notice in
accordance  with the  Indenture.  The Company,  any Affiliate or any  Subsidiary
thereof may act as the Paying Agent or Registrar.
<PAGE>

4.  Indenture; Limitations.

                  The Company  issued the Notes under an  Indenture  dated as of
[__________],  1997  (the  "Indenture"),  between  the  Company,  Orion  Network
Systems,  Inc., Orion Satellite  Corporation,  International  Private  Satellite
Partners,  L.P., OrionNet,  Inc., Orion Asia Pacific  Corporation,  Asia Pacific
Space and Communications, Ltd., Orion Atlantic Europe, Inc. and OrionNet Finance
Corporation,  as  guarantors,  and the Bankers  Trust  Company,  as trustee (the
"Trustee"). Capitalized terms herein are used as defined in the Indenture unless
otherwise  indicated.  The  terms  of the  Notes  include  those  stated  in the
Indenture  and  those  made  part of the  Indenture  by  reference  to the Trust
Indenture Act. The Notes are subject to all such terms, and Holders are referred
to the Indenture and the Trust  Indenture Act for a statement of all such terms.
To the extent  permitted by  applicable  law, in the event of any  inconsistency
between the terms of this Note and the terms of the Indenture,  the terms of the
Indenture shall control.

                  The Notes are unsecured  senior  indebtedness  of the Company.
The Indenture limits the aggregate principal amount of the Notes to $[ ].

5.  Optional Redemption.

                  The Notes will be  redeemable,  at the  Company's  option,  in
whole or in part,  at any  time or from  time to time on or after [ ],  2002 and
prior to maturity, upon not less than 30 nor more than 60 days' prior notice, at
the following  Redemption  Prices  (expressed in percentages of their  principal
amount),  plus accrued and unpaid  interest,  if any, to the Redemption  Date if
redeemed during the 12-month period commencing on October [__] of the applicable
years set forth below:

                  Year                               Redemption Price

                  2002                                      [_____]%
                  2003                                      [_____]%
                  2004 and thereafter                       100.000%


6.  Selection of Notes for Partial Redemption; Effect of Redemption Notice.

                  In the case of any partial redemption,  selection of the Notes
for redemption will be made by the Trustee in compliance  with the  requirements
of the principal national  securities  exchange,  if any, on which the Notes are
listed or, if the Notes are not listed on a national securities  exchange,  on a
pro rata basis,  by lot or by such method as the Trustee in its sole  discretion
shall  deem to be fair  and  appropriate;  provided  that no Note of  $1,000  in
principal  amount  or less  shall  be  redeemed  in  part.  If any Note is to be
redeemed  in part only,  the notice of  redemption  relating  to such Note shall
state the portion of the principal amount thereof to be redeemed.  A new Note in
principal  amount equal to the unredeemed  portion thereof will be issued in the
name of the Holder  thereof upon  cancellation  of the original  Note.  Upon the
giving of any redemption  notice,  interest on Notes called for redemption  will
cease to accrue from and 


<PAGE>

after the date fixed for  redemption  (unless the Company  defaults in providing
the funds for such redemption) and such Notes will then cease to be outstanding.

7.  Notice of Redemption.

                  Notice of any optional  redemption  will be mailed at least 30
days but not more than 60 days  before  the  Redemption  Date to the  Holders of
Notes to be redeemed at such  Holder's  registered  address as it appears in the
Register.

8. Repurchase upon Change of  Control.

                  Upon the occurrence of any Change of Control, the Company will
be obligated to make an offer to purchase all outstanding  Notes pursuant to the
Offer to Purchase  described in the Indenture at a purchase  price equal to 101%
of the aggregate  principal amount thereof plus accrued and unpaid interest,  if
any, to the date of purchase (the "Change of Control Payment").

                  A notice of such  Change of Control  will be mailed  within 30
days after any Change of Control occurs to each Holder of Notes at such Holder's
registered   address  as  it  appears  in  the   Register.   Notes  in  original
denominations  larger than  $1,000 may be sold to the Company in part;  provided
that Notes will only be issued in  denominations  of $1,000  principal amount at
maturity or integral multiples thereof.  On and after the Payment Date, interest
ceases to accrue on Notes or portions of Notes  surrendered  for purchase by the
Company,  unless the  Company  defaults  in the payment of the Change of Control
Payment.

9.  Denomination.

                  This  Certificated  Note is in fully  registered  form without
coupons and is denominated  in an amount equal to $1,000 of principal  amount at
maturity or an integral  multiple thereof and is transferable by presentation or
surrender to the  registrar  for  registration  of transfer  either  endorsed or
accompanied  by a written  instrument  of transfer in form  satisfactory  to the
registrar.

10.  Persons Deemed Owners.

                  The  holder of this Note shall be treated as the owner of this
Note for all purposes.

11.  Unclaimed Money.

                  If money for the payment of  principal,  premium,  if any, and
interest remains  unclaimed for two years, the Trustee and the Paying Agent will
pay the money back to the Company at its request.  After that,  Holders entitled
to the money must look to the  Company for  payment,  unless an  applicable  law
designates  another  Person,  and all  liability  of the Trustee and such Paying
Agent with respect to such money shall cease.
<PAGE>

12.  Discharge Prior to Redemption or Maturity.

                  If the  Company  deposits  with  the  Trustee  money  or  U.S.
Government  Obligations  sufficient  to pay the then  outstanding  principal of,
premium,  if any, and accrued  interest on the Notes (a) to redemption or Stated
Maturity,  the Company  will be  discharged  from the  Indenture  and the Notes,
except in certain circumstances for certain sections thereof, or (b) the Company
will be discharged from certain covenants set forth in the Indenture.

13.  Amendment; Supplement; Waiver.

                  Subject to certain exceptions,  the Indenture or the Notes may
be  amended  or  supplemented  with the  consent  of the  Holders  of at least a
majority in aggregate  principal amount of the Notes then  outstanding,  and any
existing default or compliance with any provision may be waived with the consent
of the Holders of at least a majority in aggregate principal amount of the Notes
then  outstanding.  Without notice to or the consent of any Holder,  the parties
thereto  may amend or  supplement  the  Indenture  or the Notes to,  among other
things,  cure any ambiguity,  defect or  inconsistency  and make any change that
does not materially and adversely affect the rights of any Holder.

14.  Restrictive Covenants.

                  The Indenture  imposes  certain  limitations on the ability of
the Company  and the  Restricted  Subsidiaries,  among  other  things,  to Incur
additional  Indebtedness;  create Liens; pay dividends or make  distributions in
respect  of  their  Capital  Stock;  make  Investments  or  make  certain  other
Restricted  Payments;  engage in Asset Sales;  issue or sell stock of Restricted
Subsidiaries;  enter into transactions with stockholders or Affiliates; or, with
respect to the Company,  consolidate,  merge or sell all or substantially all of
its  assets.  Within 90 days  after the end of the last  fiscal  quarter of each
year,  the  Company  must  report  to  the  Trustee  on  compliance   with  such
limitations.

15.  Successor Persons.

                  Generally, when a successor person or other entity assumes all
the  obligations  of its  predecessor  under the Notes  and the  Indenture,  the
predecessor person will be released from those obligations.

16.  Defaults and Remedies.

                  The following events will be defined as "Events of Default" in
the Indenture:  (a) default in the payment of principal of (or premium,  if any,
on)  any  Note  when  the  same  becomes  due  and  payable  at  maturity,  upon
acceleration, redemption or otherwise; (b) default in the payment of interest on
any Note when the same becomes due and payable, and such default continues for a
period  of 30  days;  provided  that a  failure  to make  any of the  first  six
scheduled  interest  payments on the Notes in a timely manner will constitute an
Event of Default with no grace or cure period;  (c) defaults in the  performance
or breach of the  provisions  of Section 5.01


<PAGE>

of the  Indenture or the failure to make or  consummate  an Offer to Purchase in
accordance  with Section 4.11 or Section 4.13 of the Indenture;  (d) the Company
defaults in the  performance  of or breaches any other  covenant or agreement of
the Company in the Indenture or under the Notes (other than a default  specified
in clause  (a),  (b) or (c) above) and such  default or breach  continues  for a
period of 30 consecutive days after written notice by the Trustee or the Holders
of 25% or more in aggregate principal amount at maturity of the Notes; (e) there
occurs with respect to any issue or issues of Indebtedness of the Company or any
Significant  Subsidiary having an outstanding principal amount of $10 million or
more in the  aggregate  for all such issues of all such  Persons,  whether  such
Indebtedness  now exists or shall hereafter be created,  (I) an event of default
that has caused the holder  thereof to declare such  Indebtedness  to be due and
payable  prior  to its  Stated  Maturity  and  such  Indebtedness  has not  been
discharged  in full or such  acceleration  has not been  rescinded  or  annulled
within 30 days of such acceleration  and/or (II) the failure to make a principal
payment at the final (but not any interim)  fixed  maturity  and such  defaulted
payment  shall not have been  made,  waived or  extended  within 30 days of such
payment default;  (f) any final judgment or order (not covered by insurance) for
the  payment  of money in excess of $10  million in the  aggregate  for all such
final  judgments or orders against all such Persons  (treating any  deductibles,
self-insurance  or  retention as not so covered)  shall be rendered  against the
Company or any Significant  Subsidiary and shall not be paid or discharged,  and
there shall be any period of 30 consecutive  days  following  entry of the final
judgment or order that causes the aggregate  amount for all such final judgments
or orders  outstanding  and not paid or  discharged  against all such Persons to
exceed $10 million  during which a stay of enforcement of such final judgment or
order, by reason of a pending appeal or otherwise, shall not be in effect; (g) a
court  having  jurisdiction  in the  premises  enters a decree  or order for (A)
relief in respect of the Company or any Significant Subsidiary in an involuntary
case under any  applicable  bankruptcy,  insolvency  or other similar law now or
hereafter  in effect,  (B)  appointment  of a  receiver,  liquidator,  assignee,
custodian,  trustee,  sequestrator  or similar  official  of the  Company or any
Significant  Subsidiary  or for all or  substantially  all of the  property  and
assets of the  Company or any  Significant  Subsidiary  or (C) the winding up or
liquidation of the affairs of the Company or any Significant  Subsidiary and, in
each case, such decree or order shall remain unstayed and in effect for a period
of 30  consecutive  days; or (h) the Company or any  Significant  Subsidiary (A)
commences a voluntary case under any applicable bankruptcy,  insolvency or other
similar law now or hereafter in effect, or consents to the entry of an order for
relief  in an  involuntary  case  under  any  such  law,  (B)  consents  to  the
appointment  of  or  taking  possession  by a  receiver,  liquidator,  assignee,
custodian,  trustee,  sequestrator  or similar  official  of the  Company or any
Significant  Subsidiary  or for all or  substantially  all of the  property  and
assets of the Company or any  Significant  Subsidiary or (C) effects any general
assignment for the benefit of creditors.

                  If an  Event  of  Default  (other  than an  Event  of  Default
specified  in clause (g) or (h) above that occurs with  respect to the  Company)
occurs and is continuing  under the Indenture,  the Trustee or the Holders of at
least 25% in aggregate  principal amount  outstanding,  by written notice to the
Company  (and to the Trustee if such notice is given by the  Holders),  may, and
the Trustee at the request of such Holders shall,  declare the principal  amount
of, premium, if any, and accrued interest on the Notes to be immediately due and
payable. Upon a declaration of acceleration,  such principal amount of, premium,
if any, and accrued interest shall be immediately due and payable.  In the event
of a declaration of acceleration because an Event of Default set 


<PAGE>

forth in clause (e) above has occurred and is  continuing,  such  declaration of
acceleration  shall be  automatically  rescinded  and  annulled  if the event of
default  triggering  such  Event of  Default  pursuant  to  clause  (e) shall be
remedied  or cured by the  Company or the  relevant  Significant  Subsidiary  or
waived by the  holders  of the  relevant  Indebtedness  within 60 days after the
declaration  of  acceleration  with  respect  thereto.  If an Event  of  Default
specified in clause (g) or (h) above  occurs with  respect to the  Company,  the
principal  amount of,  premium,  if any, and accrued  interest on the Notes then
outstanding  shall ipso facto become and be immediately  due and payable without
any  declaration  or other act on the part of the  Trustee  or any  Holder.  The
Holders  of at  least  a  majority  in  principal  amount  at  maturity  of  the
outstanding Notes by written notice to the Company and to the Trustee, may waive
all past defaults and rescind and annul a declaration  of  acceleration  and its
consequences if (i) all existing Events of Default, other than the nonpayment of
the  principal of,  premium,  if any, and interest on the Notes that have become
due solely by such  declaration of  acceleration,  have been cured or waived and
(ii) the rescission would not conflict with any judgment or decree of a court of
competent jurisdiction.

                  The  Holders of at least a  majority  in  aggregate  principal
amount at  maturity  of the  outstanding  Notes may direct the time,  method and
place of conducting any  proceeding  for any remedy  available to the Trustee or
exercising any trust or power conferred on the Trustee. However, the Trustee may
refuse to follow any direction that  conflicts  with law or the Indenture,  that
may involve the Trustee in personal liability, or that the Trustee determines in
good  faith may be unduly  prejudicial  to the  rights of  Holders  of Notes not
joining in the giving of such  direction  and may take any other action it deems
proper that is not inconsistent with any such direction received from Holders of
Notes.  A Holder may not pursue any remedy with respect to the  Indenture or the
Notes unless:  (i) the Holder gives the Trustee  written  notice of a continuing
Event of Default; (ii) the Holders of at least 25% in aggregate principal amount
at maturity of outstanding Notes make a written request to the Trustee to pursue
the  remedy;   (iii)  such  Holder  or  Holders  offer  the  Trustee   indemnity
satisfactory  to the Trustee against any costs,  liability or expense;  (iv) the
Trustee  does not comply  with the request  within 60 days after  receipt of the
request  and the offer of  indemnity;  and (v) during such  60-day  period,  the
Holders  of a  majority  in  aggregate  principal  amount  at  maturity  of  the
outstanding  Notes do not give the Trustee a direction that is inconsistent with
the request.  However,  such limitations do not apply to the right of any Holder
of a Note to receive payment of the principal of,  premium,  if any, or interest
on, such Note or to bring suit for the  enforcement  of any such payment,  on or
after the due date expressed in the Notes,  which right shall not be impaired or
affected without the consent of the Holder.

17.  Trustee Dealings with Company.

                  The Trustee  under the  Indenture,  in its  individual  or any
other capacity, may become owner or pledgee of Notes and may otherwise deal with
the Company or its Affiliates  with the same rights it would have if it were not
the Trustee.
<PAGE>

18.  No Recourse Against Others.

                  No recourse for the payment of the principal of,  premium,  if
any, or interest on any of the Notes or for any claim based thereon or otherwise
in respect  thereof,  and no recourse under or upon any obligation,  covenant or
agreement of the Company in the Indenture,  or in any of the Notes or because of
the creation of any Indebtedness  represented thereby,  shall be had against any
incorporator,  stockholder, officer, director, employee or controlling person of
the Company or of any successor  Person thereof.  Each Holder,  by accepting the
Notes, waives and releases all such liability.

19.  Authentication.

                  This  Note   shall  not  be  valid   until  the   Trustee   or
authenticating  agent signs the certificate of  authentication on the other side
of this Note.

20.  CUSIP Numbers.

                  Pursuant to a  recommendation  promulgated by the Committee on
Uniform Security Identification Procedures, the Company has caused CUSIP numbers
to be printed on the Notes and the Trustee  may use CUSIP  numbers in notices of
redemption  as a convenience  to Holders.  No  representation  is made as to the
accuracy of such  numbers  either as printed on the Notes or as contained in any
notice of redemption and reliance may be placed only on the other identification
numbers placed thereon.

                  The  internal  laws of the State of New York shall govern this
Note without regard to principles of conflict of laws.

                  The Company will  furnish to any Holder upon  written  request
and without charge a copy of the Indenture.  Requests may be made to Orion Newco
Services,  Inc., 2440 Research Boulevard,  Suite 40, Rockville,  Maryland 20850,
Attention: [____________].




<PAGE>



SCHEDULE A

                  SCHEDULE OF PRINCIPAL AMOUNT OF INDEBTEDNESS
                             EVIDENCED BY THIS NOTE


                  The initial principal amount of indebtedness evidenced by this
Note shall be $ __,__,__.  The  following  decreases/increases  in the principal
amount evidenced by this Note have been made:
<TABLE>
<CAPTION>

                    Decrease in       Increase in      Total Principal Amount of
                    Principal         Principal        this Global Note Following    Notation Made
Date of Decrease/   Amount of this    Amount of this   such Decrease/Increase        by or on
Increase            Global Note       Global Note                                    Behalf of
                                                                                     Trustee

<S>                 <C>


















</TABLE>

<PAGE>



                       OPTION OF HOLDER TO ELECT PURCHASE


                  If you  wish  to  have  this  Note  purchased  by the  Company
pursuant to Section 4.11 or Section 4.13 of the Indenture, check the box:

                  If you wish to have a portion  of this Note  purchased  by the
Company  pursuant to Section  4.11 or Section 4.13 of the  Indenture,  state the
amount (in principal amount):
$___________________ ($1000 or integral multiple thereof).

Date:________________

Your Signature:____________________________________________________________


Signature Guarantee:  ______________________________
















                          ORION NETWORK SYSTEMS, INC.,
                                   as Issuer,


                                       and


                          [__________________________],
                                   as Trustee





                         Senior Discount Notes Indenture

                              Dated as of [ ], 1997



                       [ ]% Senior Discount Notes due 2007






<PAGE>






                              CROSS-REFERENCE TABLE



TIA Sections      Indenture Sections

ss. 310(a)(1)..........................................................7.10
       (a)(2)..........................................................7.10
       (b).............................................................7.08
ss. 313(c).............................................................7.06
ss. 314(a).............................................................4.17
       (a)(4)..........................................................4.18
ss. 315(b).............................................................7.05
ss. 316(a)(1)(A).......................................................6.05
       (a)(1)(B).......................................................6.04
       (b).............................................................6.07
ss. 317(a)(1)..........................................................6.08
       (a)(2)..........................................................6.09



















- ----------

Note:    The Cross-Reference Table shall not for any purpose be deemed to be a 
         part of the Indenture.


<PAGE>



                                TABLE OF CONTENTS

                                                                            Page

RECITALS OF THE COMPANY                                                        1

                                   ARTICLE ONE
                   DEFINITIONS AND INCORPORATION BY REFERENCE

SECTION 1.01.  Definitions                                                     2
SECTION 1.02.  Incorporation by Reference of Trust Indenture Act              22
SECTION 1.03.  Rules of Construction                                          22

                                   ARTICLE TWO
                                    THE NOTES


SECTION 2.01.  Form and Dating                                                23
SECTION 2.02.  Execution and Authentication                                   24
SECTION 2.03.  Registrar and Paying Agent                                     24
SECTION 2.04.  Holders to Be Treated as Owners; Payments of Interest          25
SECTION 2.05.  Paying Agent to Hold Money in Trust                            26
SECTION 2.06.  Holder Lists                                                   26
SECTION 2.07.  Transfer and Exchange                                          27
SECTION 2.08.  Replacement Notes                                              30
SECTION 2.09.  Outstanding Notes                                              31
SECTION 2.10.  Treasury Notes                                                 31
SECTION 2.11.  Temporary Notes                                                31
SECTION 2.12.  Cancellation                                                   31
SECTION 2.13.  Defaulted Interest                                             32
SECTION 2.14.  CUSIP, CINS or ISIN Number                                     48
SECTION 2.15.  Deposit of Moneys                                              32

                                  ARTICLE THREE
                                   REDEMPTION

SECTION 3.01.  Right of Redemption                                            33
SECTION 3.02.  Notices to Trustee                                             33
SECTION 3.03.  Selection of Notes to Be Redeemed                              33
SECTION 3.04.  Notice of Redemption                                           34
SECTION 3.05.  Deposit of Redemption Price                                    35
SECTION 3.06.  Payment of Notes Called for Redemption                         35
SECTION 3.07.  Notes Redeemed in Part                                         35

- ----------
Note:     The Table of Contents shall not for any purpose be deemed to be a part
          of the Indenture.



<PAGE>
                                  ARTICLE FOUR
                                    COVENANTS

SECTION 4.01.  Payment of Notes                                               35
SECTION 4.02.  Issuances of Guarantees by New Restricted Subsidiaries         35
SECTION 4.03.  Limitation on Indebtedness                                     36
SECTION 4.04.  Limitation on Restricted Payments                              38
SECTION 4.05.  Limitation on Dividend and Other Payment Restrictions Affect-
                ing Restricted Subsidiaries                                   41
SECTION 4.06.  Limitation on the Issuance of Capital Stock of Restricted
                Subsidiaries                                                  42
SECTION 4.07.  Limitation on Issuances of Guarantees by Restricted
                Subsidiaries                                                  43
SECTION 4.08.  Limitation on Transactions with Shareholders and Affiliates    43
SECTION 4.09.  Limitation on Liens                                            44
SECTION 4.10.  Limitation on Sale-Leaseback Transactions                      44
SECTION 4.11.  Limitation on Asset Sales                                      45
SECTION 4.12.  Maintenance of Office or Agency 
SECTION 4.13.  Repurchase of Notes upon a Change of Control                   46
SECTION 4.14.  Existence                                                      46
SECTION 4.15.  Payment of Taxes and Other Claims                              46
SECTION 4.16.  Maintenance of Properties and Insurance                        47
SECTION 4.17.  Compliance Certificates                                        48
SECTION 4.18.  Commission Reports and Reports to Holders                      48
SECTION 4.19.  Waiver of Stay, Extension or Usury Laws                        48

                                  ARTICLE FIVE
                              SUCCESSOR CORPORATION

SECTION 5.01.  Consolidation, Merger and Sale of Assets                       49
SECTION 5.02.  Successor Substituted                                          50

                                   ARTICLE SIX
                              DEFAULT AND REMEDIES

SECTION 6.01.  Events of Default                                              50
SECTION 6.02.  Acceleration                                                   52
SECTION 6.03.  Other Remedies                                                 52
SECTION 6.04.  Waiver of Past Defaults                                        53
SECTION 6.05.  Control by Majority                                            53
SECTION 6.06.  Limitation on Suits                                            53
SECTION 6.07.  Rights of Holders to Receive Payment                           54
SECTION 6.08.  Collection of Indebtedness and Suits for
                Enforcement by Trustee                                        55
SECTION 6.09.  Trustee May File Proofs of Claim                               55
SECTION 6.10.  Priorities 55
SECTION 6.11.  Undertaking for Costs                                          56



<PAGE>



SECTION 6.12.  Restoration of Rights and Remedies 56
SECTION 6.13.  Rights and Remedies Cumulative                                 56
SECTION 6.14.  Delay or Omission Not Waiver                                   56

                                  ARTICLE SEVEN
                                     TRUSTEE

SECTION 7.01.  General                                                        57
SECTION 7.02.  Certain Rights of Trustee 57
SECTION 7.03.  Individual Rights of Trustee                                   58
SECTION 7.04.  Trustee's Disclaimer                                           58
SECTION 7.05.  Notice of Default                                              59
SECTION 7.06.  Reports by Trustee to Holders                                  59
SECTION 7.07.  Compensation and Indemnity                                     59
SECTION 7.08.  Replacement of Trustee                                         60
SECTION 7.09.  Successor Trustee by Merger, Etc                               61
SECTION 7.10.  Eligibility                                                    61
SECTION 7.11.  Money Held in Trust                                            61
SECTION 7.12.  Withholding Taxes                                              61

                                  ARTICLE EIGHT
                             DISCHARGE OF INDENTURE

SECTION 8.01.  Termination of Company's Obligations                           61
SECTION 8.03.  Defeasance of Certain Obligations                              64
SECTION 8.04.  Application of Trust Money                                     66
SECTION 8.05.  Repayment to Company                                           66
SECTION 8.06.  Reinstatement                                                  66

                                  ARTICLE NINE
                       AMENDMENTS, SUPPLEMENTS AND WAIVERS

SECTION 9.01.  Without Consent of Holders                                     67
SECTION 9.02.  With Consent of Holders                                        67
SECTION 9.03.  Revocation and Effect of Consent                               68
SECTION 9.04.  Notation on or Exchange of Notes                               69
SECTION 9.05.  Trustee to Sign Amendments, Etc                                69
SECTION 9.06.  Conformity with Trust Indenture Act                            69

                                   ARTICLE TEN
                               GUARANTEE OF NOTES

SECTION 10.01.  Guarantee                                                     69
SECTION 10.02.  Obligations Unconditional                                     71
SECTION 10.03.  Notice to Trustee                                             71


<PAGE>



SECTION 10.04.  This Article Not to Prevent Events of Default                 71
SECTION 10.05.  Net Worth Limitation                                          71



                                 ARTICLE ELEVEN
                                  MISCELLANEOUS

SECTION 11.01.  Trust Indenture Act of 1939                                   71
SECTION 11.02.  Notices                                                       72
SECTION 11.03.  Certificate and Opinion as to Conditions Precedent            73
SECTION 11.04.  Statements Required in Certificate or Opinion                 73
SECTION 11.06.  Rules by Trustee, Paying Agent or Registrar                   75
SECTION 11.07.  Agent for Service; Submission to Jurisdiction; Waiver of 
                Immunities                                                    75
SECTION 11.08.  Payment Date Other Than a Business Day                        75
SECTION 11.09.  Governing Law                                                 75
SECTION 11.10.  No Adverse Interpretation of Other Agreements                 76
SECTION 11.10.  No Recourse Against Others                                    76
SECTION 11.11.  Successors                                                    76
SECTION 11.12.  Duplicate Originals                                           76
SECTION 11.13.  Separability                                                  76
SECTION 11.14.  Table of Contents, Headings, Etc.                             76



EXHIBIT A                  Form of Global Note       A-1
EXHIBIT B                  Form of Definitive Registered Note B-1


<PAGE>
                  INDENTURE,  dated  as  of  [  ],  1997,  between  ORION  NEWCO
SERVICES, INC., a Delaware corporation, as issuer (together, with its successors
and assigns, the "Company");  ORION NETWORK SYSTEMS, INC., Inc., ORION SATELLITE
CORPORATION,  INTERNATIONAL PRIVATE SATELLITE PARTNERS,  L.P., ORIONNET,  INC..,
ORION ASIA PACIFIC  CORPORATION,  ASIA PACIFIC SPACE AND  COMMUNICATIONS,  LTD.,
ORION ATLANTIC EUROPE, Ltd., ORION ATLANTIC EUROPE Inc; A. and ORION NET FINANCE
CORPORATION Net Finance Corporation.,  all Delaware Corporations, as guarantors;
and BANKERS  TRUST  COMPANY,  a New York  Banking  Corporation,  as trustee (the
"Trustee").

                             RECITALS OF THE COMPANY

                  The Company has duly  authorized the execution and delivery of
this  Indenture  to provide for the  issuance of up to $[ ] aggregate  principal
amount at maturity of the  Company's  [ ]% Senior  Discount  Notes Due 2007 (the
"Notes")  issuable as provided  in this  Indenture.  Pursuant to the terms of an
Underwriting  Agreement  dated as of [ ],  1997 (the  "Underwriting  Agreement")
between the Company and Morgan  Stanley & Co.  Incorporated,  as the manager for
itself and the several  other  placement  agents  therein (the  "Manager"),  the
Company  has  agreed  to issue and sell [ ] Units  (the  "Units"),  each  Senior
Discount Note Unit consisting of $[________]  principal  amount of the Notes and
one warrant (the  "Warrant")  to purchase  initially [ ] shares of Common Stock,
par value $.01 per share, of the Company (the "Common Stock"), issuable pursuant
to the terms of a Warrant  Agreement dated as of [________],  1997 (the "Warrant
Agreement")  between the Company  and [ ], as the  warrant  agent (the  "Warrant
Agent") and [ ] Senior Note Units (the  "Senior Note  Units"),  each Senior Note
Unit  consisting of  $[________]  principal  amount of the [ ]% Senior Notes Due
2007 (the  "Senior  Notes") and one Warrant to purchase  initially [ ] shares of
Common  Stock,  issuable  pursuant  to the terms of the Warrant  Agreement.  All
things  necessary to make this  Indenture a valid  agreement of the Company,  in
accordance  with its terms,  have been done, and the Company has done all things
necessary to make the Notes,  when executed by the Company and authenticated and
delivered by the Trustee  hereunder  and duly issued by the  Company,  the valid
obligations of the Company as hereinafter provided.

                  This  Indenture  is subject to, and shall be governed  by, the
provisions  of the United States Trust  Indenture Act of 1939, as amended,  that
are required to be a part of and to govern indentures qualified under the United
States Trust Indenture Act of 1939, as amended.

                  For and in  consideration  of the premises and the purchase of
the Notes by the Holders thereof,  it is mutually covenanted and agreed, for the
equal and proportionate benefit of all Holders, as follows.


<PAGE>






                                   ARTICLE ONE
                   DEFINITIONS AND INCORPORATION BY REFERENCE

                  SECTION 1.01.  Definitions .

                  "Accreted  Value" is defined to mean, for any Specified  Date,
the amount  calculated  pursuant  to (i),  (ii),  (iii) or (iv) for each  $1,000
principal amount at maturity of Senior Discount Notes:

                  (i) if the  Specified  Date  occurs  on  one  or  more  of the
         following dates (each a "Semi-Annual Accrual Date"), the Accreted Value
         will  equal the  amount set forth  below for such  Semi-Annual  Accrual
         Date:

                                       Semi-Annual              Accreted
                                      Accrual Date                Value
                                      ------------                -----
                               [              ], 1997       $[          ]
                                --------------                ----------
                               [              ], 1998       $[          ]
                                --------------                ----------
                               [              ], 1998       $[          ]
                                --------------                ----------
                               [              ], 1999       $[          ]
                                --------------                ----------
                               [              ], 1999       $[          ]
                                --------------                ----------
                               [              ], 2000       $[          ]
                                --------------                ----------
                               [              ], 2000       $[          ]
                                --------------                ----------
                               [              ], 2001       $[          ]
                                --------------                ----------
                               [              ], 2001       $[          ]
                                --------------                ----------
                               [              ], 2002       $1,000.00
                                --------------

                  (ii) if the Specified Date occurs before the first Semi-Annual
         Accrual Date, the Accreted Value will equal the sum of (a) the original
         issue price and (b) an amount  equal to the product of (1) the Accreted
         Value for the first  Semi-Annual  Accrual Date less the original  issue
         price  multiplied  by (2) a  fraction,  the  numerator  of which is the
         number of days from the issue date of the Notes to the Specified  Date,
         using a 360-day year of twelve 30-day  months,  and the  denominator of
         which is the number of days elapsed from the issue date of the Notes to
         the first  Semi-Annual  Accrual  Date,  using a 360-day  year of twelve
         30-day months;

                  (iii) if the  Specified  Date occurs  between two  Semi-Annual
         Accrual  Dates,  the  Accreted  Value  will  equal  the  sum of (a) the
         Accreted Value for the Semi-Annual  Accrual Date immediately  preceding
         such Specified Date and (b) an amount equal to the


<PAGE>



product of (1) the  Accreted  Value for the  immediately  following  Semi-Annual
Accrual Date less the Accreted Value for the immediately  preceding  Semi-Annual
Accrual Date multiplied by (2) a fraction,  the numerator of which is the number
of days from the immediately preceding Semi-Annual Accrual Date to the Specified
Date, using a 360-day year of twelve 30-day months, and the denominator of which
is 180; or

                  (iv) if the Specified  Date occurs after the last  Semi-Annual
Accrual Date, the Accreted Value will equal $1,000.


                  "Acquired   Indebtedness"   means  Indebtedness  of  a  Person
existing at the time such Person  becomes a Restricted  Subsidiary or assumed in
connection with an Asset Acquisition by a Restricted Subsidiary and not Incurred
in connection  with, or in  anticipation  of, such Person  becoming a Restricted
Subsidiary or such Asset Acquisition;  provided that Indebtedness of such Person
which is  redeemed,  defeased,  retired  or  otherwise  repaid at the time of or
immediately upon consummation of the transactions by which such Person becomes a
Restricted Subsidiary or such Asset Acquisition shall not be Indebtedness.

                  "Adjusted  Consolidated Net Income" means, for any period, the
aggregate  net income (or loss) of the  Company  and its  Subsidiaries  for such
period  determined in conformity  with GAAP;  provided that the following  items
shall be  excluded  in  computing  Adjusted  Consolidated  Net  Income  (without
duplication):  (i)  the  net  income  of  any  Person  (other  than  net  income
attributable  to a Restricted  Subsidiary)  in which any Person  (other than the
Company or any of its Restricted  Subsidiaries) has a joint interest and the net
income  (or  loss)  of  any  Unrestricted   Subsidiary,   except  that  Adjusted
Consolidated  Net Income for any period shall include the amount of dividends or
other  distributions  actually  paid  to the  Company  or any of its  Restricted
Subsidiaries by such other Person or such  Unrestricted  Subsidiary  during such
period;  (ii) solely for the purposes of  calculating  the amount of  Restricted
Payments  that may be made  pursuant  to clause  (C) of the first  paragraph  of
Section  4.04  of this  Indenture  (and,  in such  case,  except  to the  extent
includable pursuant to clause (i) above), the net income (or loss) of any Person
accrued  prior to the date it becomes a Restricted  Subsidiary or is merged into
or consolidated with the Guarantor or any of its Restricted  Subsidiaries or all
or  substantially  all of the property and assets of such Person are acquired by
the Company or any of its Restricted Subsidiaries; (iii) any gains or losses (on
an after-tax  basis)  attributable  to Asset Sales;  (iv) except for purposes of
calculating  the amount of  Restricted  Payments  that may be made  pursuant  to
clause (C) of the first paragraph of Section 4.04 of this Indenture,  any amount
paid or accrued as dividends on Preferred Stock of the Company or any Restricted
Subsidiary  owned by Persons  other than the Company  and any of its  Restricted
Subsidiaries; (v) all extraordinary gains and extraordinary losses; and (vi) any
net income (or loss) of any Guarantor  that ceases to be a Guarantor  because it
is designated an Unrestricted Subsidiary.

                  "Adjusted  Consolidated  Net Tangible  Assets" means the total
amount of assets of the Company and its Restricted Subsidiaries (less applicable
depreciation,  amortization and other valuation reserves),  except to the extent
resulting from write-ups of capital  assets  (excluding  write-ups in connection
with accounting for acquisitions in conformity with GAAP), after


<PAGE>



 deducting  therefrom  (i)  all  current  liabilities  of the  Company  and  its
Restricted  Subsidiaries  (excluding  intercompany items) and (ii) all goodwill,
trade names,  trademarks,  patents,  unamortized  debt  discount and expense and
other like intangibles,  all as set forth on the most recent quarterly or annual
consolidated  balance  sheet of the  Company  and its  Restricted  Subsidiaries,
prepared  in  conformity  with GAAP and filed with the  Commission  pursuant  to
Section 4.18 of this Indenture.

                  "Affiliate"  means, as applied to any Person, any other Person
directly or indirectly  controlling,  controlled by, or under direct or indirect
common control with,  such Person.  For purposes of this  definition,  "control"
(including,  with correlative meanings, the terms "controlling," "controlled by"
and  "under  common  control  with"),  as  applied  to  any  Person,  means  the
possession,  directly  or  indirectly,  of the  power to  direct  or  cause  the
direction of the  management  and policies of such Person,  whether  through the
ownership of voting securities, by contract or otherwise.

                  "Agent"  means any  Registrar,  Paying  Agent,  authenticating
agent or co-Registrar.

                  "Applicable Procedures" means, with respect to any transfer or
exchange of beneficial  interest in the Global Note, the rules and procedures of
the Depositary that apply to such transfer or exchange.

                  "Asset  Acquisition" means (i) an investment by the Company or
any of its Restricted  Subsidiaries  in any other Person  pursuant to which such
Person  shall  become  a  Restricted  Subsidiary  or  shall  be  merged  into or
consolidated  with the Company or any of its Restricted  Subsidiaries;  provided
that such Person's  primary  business is related,  ancillary or complementary to
the  businesses of the Company and its  Restricted  Subsidiaries  on the date of
such  investment or (ii) an  acquisition by the Company or any of its Restricted
Subsidiaries  of the property and assets of any Person other than the Company or
any  of its  Restricted  Subsidiaries  that  constitute  substantially  all of a
division or line of business of such  Person;  provided  that the  property  and
assets acquired are related, ancillary or complementary to the businesses of the
Company and its Restricted Subsidiaries on the date of such acquisition.

                  "Asset Disposition" means the sale or other disposition by the
Company or any of its  Restricted  Subsidiaries  (other  than to the  Company or
another  Restricted  Subsidiary) of (i) all or substantially  all of the Capital
Stock of any Restricted  Subsidiary of the Company or (ii) all or  substantially
all of the assets that  constitute a division or line of business of the Company
or any of its Restricted Subsidiaries.

                  "Asset  Sale" means any sale,  transfer  or other  disposition
(including by way of merger, consolidation or sale-leaseback transaction) in one
transaction  or a series of related  transactions  by the  Company or any of its
Restricted  Subsidiaries  to any  Person  other  than the  Company or any of its
Restricted Subsidiaries of (i) all or any of the Capital Stock of any Restricted
Subsidiary,  (ii) all or  substantially  all of the  property  and  assets of an
operating unit or business of the Company or any of its Restricted  Subsidiaries
or (iii) any other  property and assets of the Company or any of its  Restricted
Subsidiaries outside the ordinary course of


<PAGE>



business of the Company or such Restricted Subsidiary and, in each case, that is
not governed by Section 5.01 of this Indenture; provided that "Asset Sale" shall
not include (a) sales or other dispositions of inventory,  receivables and other
current assets or (b) sales or other  dispositions  of assets for  consideration
received would satisfy clause (B) of Section 4.11 of this Indenture.

                  "Average Life" means, at any date  determination  with respect
to any debt  security,  the  quotient  obtained by  dividing  (i) the sum of the
products of (a) the number of years from such date of determination to the dates
of each successive scheduled principal payment of such debt security and (b) the
amount of such principal payment by (ii) the sum of all such principal payments.

                  "Board  of  Directors"  means the  Board of  Directors  of the
Company or any committee of such Board of Directors duly  authorized to act with
respect to this Indenture from time to time.

                  "Board Resolution" means a copy of a resolution,  certified by
any  Director of the Company or the  Secretary  or  Assistant  Secretary  of the
Company to have been duly  adopted by the Board of  Directors  and to be in full
force  and  effect  on the  date of such  certification,  and  delivered  to the
Trustee.

                  "Business  Day" means a day except  Saturday,  Sunday or other
day on which  commercial  banks in the City of New  York,  or in the city of the
Corporate Trust Office of the Trustee, are authorize by law to close.

                  "Capital Stock" means, with respect to any Person, any and all
shares,  interests,  participations  or other equivalents  (however  designated,
whether voting or non-voting) in equity of such Person,  whether now outstanding
or issued after the Closing  Date,  including,  without  limitation,  all Common
Stock and Preferred Stock.

                  "Capitalized Lease" means, as applied to any Person, any lease
of any  property  (whether  real,  personal  or mixed)  of which the  discounted
present value of the rental  obligations of such Person as lessee, in conformity
with GAAP,  is required to be  capitalized  on the balance sheet of such Person;
and "Capitalized  Lease  Obligations"  means the discounted present value of the
rental obligations under such lease.

                  "Certificated  Note" means a certificated  Note  registered in
the name of the Holder  thereof and issued in  accordance  with Section  2.07(a)
hereof, substantially in the form of Exhibit B hereto.

                  "Change  of  Control"  means  such time as (i) a  "person"  or
"group"  (within the meaning of Sections 13(d) and 14(d)(2) of the Exchange Act)
becomes  the  ultimate  "beneficial  owner" (as  defined in Rule 13d-3 under the
Exchange  Act) of more than 35% of the total voting power of the Voting Stock of
the Company on a fully  diluted  basis and such  ownership  is greater  than the
amount of voting power of the Voting Stock of the  Company,  on a fully  diluted
basis, held by the Existing Stockholders and their Affiliates on such date; (ii)
individuals who on the


<PAGE>



Closing Date constitute the Board of Directors  (together with any new directors
whose election by the Board of Directors or whose nomination for election by the
Company's  stockholders  was  approved by a vote of at least  two-thirds  of the
members of the Board of Directors  then in office who either were members of the
Board of  Directors  on the Closing  Date or whose  election or  nomination  for
election  was  previously  so  approved)  cease for any reason to  constitute  a
majority of the members of the Board of Directors  then in office;  or (iii) the
Company does not beneficially own 100% of the equity interests in Orion Atlantic
or such other entity as then owns the Orion 1 satellite.

                  "Chief  Executive  Officer" of the Company means W. Neil Bauer
or, in the event of his death or termination  of his office,  such other Officer
of the Company as the Company may designate.

                  "Closing   Date"  means  the  date  on  which  the  Notes  are
originally issued under the Indenture.

                  "Commission"  means the United States  Securities and Exchange
Commission, as from time to time constituted, created under the Exchange Act or,
if at any time after the  execution of this  instrument  such  Commission is not
existing and  performing  the duties now assigned to it under the TIA,  then the
body performing such duties at such time.

                  "Common  Stock" means,  the shares of Common Stock,  par value
$.01 per share, of the Company.

                  "Company Order" means a written request or order signed in the
name of the  Company  (i) by the  Chairman  of the  Board,  the Chief  Executive
Officer  or an  Executive  Director  and  (ii) by its  Treasurer,  an  Assistant
Treasurer, its Secretary or an Assistant Secretary and delivered to the Trustee;
provided,  however,  that such written request or order may be signed by any two
of the officers or directors  listed in clause (i) above in lieu of being signed
by one of such  officers or  directors  listed in such clause (i) and one of the
officers listed in clause (ii) above.

                  "Consolidated  EBITDA" means,  for any period,  the sum of the
amounts  for  such  period  of  (i)  Adjusted   Consolidated  Net  Income,  (ii)
Consolidated  Interest  Expense,  to the  extent  such  amount was  deducted  in
calculating Adjusted  Consolidated Net Income, (iii) income taxes, to the extent
such amount was deducted in calculating Adjusted  Consolidated Net Income (other
than income taxes (either  positive or negative)  attributable to  extraordinary
and  non-recurring  gains  or  losses  or sales of  assets),  (iv)  depreciation
expense,  to the  extent  such  amount  was  deducted  in  calculating  Adjusted
Consolidated Net Income, (v) amortization expense, to the extent such amount was
deducted in calculating  Adjusted  Consolidated  Net Income,  and (vi) all other
non-cash items reducing Adjusted  Consolidated Net Income (other than items that
will  require  cash  payments  and for which an  accrual  or  reserve  is, or is
required by GAAP to be,  made),  less all  non-cash  items  increasing  Adjusted
Consolidated  Net Income,  all as  determined  on a  consolidated  basis for the
Company and its Restricted Subsidiaries in conformity with GAAP.


<PAGE>





                  "Consolidated  Indebtedness"  means  the  aggregate  amount of
Indebtedness  of the Company and its Restricted  Subsidiaries  on a consolidated
basis.

                  "Consolidated  Interest  Expense" means,  for any period,  the
aggregate  amount of interest  in respect of  Indebtedness  (including,  without
limitation,  amortization of original issue discount on any Indebtedness and the
interest  portion of any deferred payment  obligation,  calculated in accordance
with the effective interest method of accounting; all commissions, discounts and
other fees and  charges  owed with  respect  to  letters of credit and  bankers'
acceptance  financing;  the net costs  associated with Interest Rate Agreements;
and in respect of  Indebtedness  that is Guaranteed or secured by any Restricted
Subsidiaries)  and all but the  principal  component  of  rentals  in respect of
Capitalized  Lease  Obligations  paid,  accrued or scheduled to be paid or to be
accrued by the  Company and its  Restricted  Subsidiaries  during  such  period;
excluding,  however,  any  premiums,  fees and  expenses  (and any  amortization
thereof) payable in connection with the offering of the Notes, all as determined
on a consolidated basis (without taking into account Unrestricted  Subsidiaries)
in conformity with GAAP.

                  "Consolidated  Leverage Ratio" means, on any Transaction Date,
the ratio of (i) the  aggregate  amount of  Indebtedness  of the Company and its
Restricted  Subsidiaries on a consolidated basis outstanding on such Transaction
Date to (ii) the  aggregate  amount  of  Consolidated  EBITDA  for the then most
recent four fiscal quarters for which  financial  statements of the Company have
been filed with the Commission  pursuant to Section 4.18 of this Indenture (such
four fiscal quarter period being the "Four Quarter  Period");  provided that (A)
pro forma effect  shall be given to Asset  Dispositions  and Asset  Acquisitions
(including  giving pro forma effect to the  application of proceeds of any Asset
Disposition)  that occur from the beginning of the Four Quarter  Period  through
the Transaction Date (the "Reference Period"),  as if they had occurred and such
proceeds had been applied on the first day of such Reference Period; and (B) pro
forma  effect  shall  be  given to asset  dispositions  and  asset  acquisitions
(including  giving pro forma effect to the  application of proceeds of any asset
disposition)  that have been made by any  Person  that has  become a  Restricted
Subsidiary  or has  been  merged  with or into  the  Company  or any  Restricted
Subsidiary  during such Reference Period and that would have  constituted  Asset
Dispositions  or Asset  Acquisitions  had such  transactions  occurred when such
Person  was a  Restricted  Subsidiary  as if such  asset  dispositions  or asset
acquisitions were Asset  Dispositions or Asset Acquisitions that occurred on the
first day of such Reference Period;  provided that to the extent that clause (A)
or (B) of this  sentence  requires  that pro  forma  effect be given to an Asset
Acquisition or Asset Disposition, such pro forma calculation shall be based upon
the four full fiscal quarters immediately  preceding the Transaction Date of the
Person,  or division  or line of  business  of the  Person,  that is acquired or
disposed of for which financial information is available.

                  "Consolidated  Net Worth" means, at any date of determination,
stockholders'  equity as set forth on the most recently  available  quarterly or
annual consolidated balance sheet of the Company and its Restricted Subsidiaries
(which  shall be as of a date not  more  than 90 days  prior to the date of such
computation),  less any amounts attributable to Disqualified Stock or any equity
security convertible into or exchangeable for Indebtedness, the cost of treasury
stock and the principal  amount of any promissory notes receivable from the sale
of the Capital


<PAGE>



Stock of the  Company  or any of its  Restricted  Subsidiaries,  each item to be
determined in conformity  with GAAP  (excluding the effects of foreign  currency
exchange  adjustments  under Financial  Accounting  Standards Board Statement of
Financial Accounting Standards No. 52).

                  "Corporate  Trust  Office"  means the office of the Trustee at
which the corporate trust business of the Trustee shall, at any particular time,
be  principally  administered,  which office is, at the date of this  Indenture,
located at Bankers Trust Company, 4 Albany Street, New York, N.Y. 10006.

                  "Currency  Agreement"  means any  foreign  exchange  contract,
currency swap agreement or other similar  agreement or  arrangement  designed to
protect  the  Company  or any  Restricted  Subsidiary  against  fluctuations  in
currency values.

                  "Default"  means any event that is, or after notice or passage
of time or both would be, an Event of Default.

                  "Depositary"  shall mean The  Depository  Trust  Company,  its
nominees and their  respective  successors,  until a successor  Depositary shall
have become such pursuant to the applicable  provisions of this  Indenture,  and
thereafter  "Depositary"  shall  been  or  include  each  Person  who is  then a
Depositary hereunder.

                  "Depositary  Interest"  means  a  certificateless   depositary
interest representing a 100% beneficial interest in a Global Note.

                  "Disqualified  Stock"  means any  class or  series of  Capital
Stock  of any  Person  that by its  terms or  otherwise  is (i)  required  to be
redeemed  prior to the Stated  Maturity  of the Notes,  (ii)  redeemable  at the
option of the holder of such class or series of Capital  Stock at any time prior
to the Stated  Maturity of the Notes or (iii)  convertible  into or exchangeable
for Capital Stock referred to in clause (i) or (ii) above or Indebtedness having
a scheduled  maturity prior to the Stated  Maturity of the Notes;  provided that
any  Capital  Stock  that  would  not  constitute  Disqualified  Stock  but  for
provisions  thereof giving  holders  thereof the right to require such Person to
repurchase or redeem such Capital  Stock upon the  occurrence of an "asset sale"
or "change of control" occurring prior to the Stated Maturity of the Notes shall
not  constitute  Disqualified  Stock if the "asset  sale" or "change of control"
provisions applicable to such Capital Stock are no more favorable to the holders
of such Capital Stock than the provisions contained in Sections 4.11 and 4.13 of
this  Indenture  and such Capital Stock  specifically  provides that such Person
will not repurchase or redeem any such stock pursuant to such provision prior to
the  Company's  repurchase  of such  Notes  as are  required  to be  repurchased
pursuant to Sections 4.11 and 4.13 of this Indenture.

                  "Existing Stockholders" means British Aerospace Space Systems,
Inc.,  Lockheed Martin  Commercial  Launch Services,  Inc., MCN Sat. U.S., Inc.,
Trans-Atlantic Satellite,  Inc., Kingston Communications  International Limited,
COM DEV Satellite  Communications  Limited,  J.V.  Saeman & Co., CIBC Wood Gundy
Ventures,  Inc.,  Cumberland  Associates,  Fleet Venture Resources,  Inc., Space
Systems/Loral and any Subsidiary of any of the foregoing


<PAGE>



 .

                  "Event of Default" has the meaning provided in Section 6.01.

                  "Excess Proceeds" has the meaning provided in Section 4.11.

                  "Exchange Act" means the United States Securities Exchange Act
of 1934, as amended.

                  "fair  market  value" means the price that would be paid in an
arm's-length  transaction  between  an  informed  and  willing  seller  under no
compulsion to sell and an informed and willing buyer under no compulsion to buy,
as determined in good faith by the Board of Directors, whose determination shall
be conclusive if evidenced by a Board Resolution.

                  "GAAP" means generally accepted  accounting  principles in the
United States of America as in effect as of the Closing Date, including, without
limitation, those set forth in the opinions and pronouncements of the Accounting
Principles Board of the American  Institute of Certified Public  Accountants and
statements and pronouncements of the Financial  Accounting Standards Board or in
such other statements by such other entity as approved by a significant  segment
of the accounting profession.  All ratios and computations contained or referred
to in the  Indentures  shall be computed in  conformity  with GAAP  applied on a
consistent  basis,  except that  calculations  made for purposes of  determining
compliance  with the terms of the  covenants  and with other  provisions  of the
Indentures  shall be made without giving effect to (i) the  amortization  of any
expenses  incurred in connection  with the offering of the Notes and (ii) except
as otherwise provided,  the amortization of any amounts required or permitted by
Accounting Principles Board Opinion No. 16 and 17.

                  "Global  Note" means the Global  Notes,  substantially  in the
form of  Exhibit A hereto  issued in  accordance  with  Section  2.01 or 2.07(a)
hereof.

                  "Government   Securities"   means   direct   obligations   of,
obligations fully guaranteed by, or participations in pools consisting solely of
obligations  of or  obligations  guaranteed by, the United States of America for
the payment of which  guarantee or obligations  the full faith and credit of the
United  States of America is pledged and which are not callable or redeemable at
the option of the issuer thereof.

                  "Guarantee" means any obligation,  contingent or otherwise, of
any  Person  directly  or  indirectly  guaranteeing  any  Indebtedness  or other
obligation  of any other  Person and,  without  limiting the  generality  of the
foregoing, any obligation,  direct or indirect, contingent or otherwise, of such
Person (i) to purchase or pay (or  advance or supply  funds for the  purchase or
payment of) such  Indebtedness or other obligation of such other Person (whether
arising by virtue of partnership  arrangements or by agreements to keep-well, to
purchase assets,  goods,  securities or services,  to take-or-pay or to maintain
financial  statement  conditions or otherwise) or (ii) entered into for purposes
of  assuring  in any other  manner  the  obligee of such  Indebtedness  or other
obligation  of the payment  thereof or to protect such  obligee  against loss in
respect thereof (in whole or in part);  provided that the term "Guarantee" shall
not include endorsements


<PAGE>



for collection or deposit in the ordinary course of business. The term Guarantee
used as a verb has a corresponding meaning.

                  "Guarantors" means collectively,  Orion Network Systems, Inc.,
Orion Satellite  Corporation,  International  Private Satellite Partners,  L.P.,
OrionNet,  Inc.,  Orion  Asia  Pacific  Corporation,   Asia  Pacific  Space  and
Communications,   Ltd.,  Orion  Atlantic  Europe,   Inc.  and  OrionNet  Finance
Corporation,  and all other  Restricted  Subsidiaries;  provided that any Person
that becomes an  Unrestricted  Subsidiary in compliance  with Section 4.04 shall
not be included in "Guarantors" after becoming an Unrestricted Subsidiary.

                  "Holder"   means  the  Person  in  whose  name  such  Note  is
registered in the Register.

                  "Incur"  means,  with respect to any  Indebtedness,  to incur,
create, issue, assume,  Guarantee or otherwise become liable for or with respect
to, or become responsible for, the payment of,  contingently or otherwise,  such
Indebtedness,  including an  "Incurrence"  of Indebtedness by reason of a Person
becoming a  Restricted  Subsidiary  of the  Company;  provided  that neither the
accrual of interest  nor the  accretion  of  original  issue  discount  shall be
considered an Incurrence of Indebtedness.

                  "Indebtedness"  means,  with respect to any Person at any date
of determination (without duplication),  (i) all indebtedness of such Person for
borrowed  money,  (ii)  all  obligations  of such  Person  evidenced  by  bonds,
debentures,  notes or other similar  instruments,  (iii) all obligations of such
Person in respect of letters of credit or other similar  instruments  (including
reimbursement  obligations with respect thereto, but excluding  obligations with
respect to  letters  of credit  (including  trade  letters  of credit)  securing
obligations  (other than  obligations  described  in clause (i) or (ii) above or
clause (v), (vi) or (vii) below) entered into in the ordinary course of business
of such  Person to the extent  such  letters of credit are not drawn upon or, if
drawn upon,  to the extent such  drawing is  reimbursed  no later than the third
Business Day  following  receipt by such Person of a demand for  reimbursement),
(iv) all  obligations  of such Person to pay the  deferred  and unpaid  purchase
price of property or services,  which purchase price is due more than six months
after the date of placing such property in service or taking  delivery and title
thereto or the  completion  of such  services,  except Trade  Payables,  (v) all
obligations  of such  Person  as  lessee  under  Capitalized  Leases,  (vi)  all
Indebtedness  of other  Persons  secured by a Lien on any asset of such  Person,
whether or not such  Indebtedness  is assumed by such Person;  provided that the
amount of such Indebtedness  shall be the lesser of (A) the fair market value of
such  asset  at  such  date  of  determination   and  (B)  the  amount  of  such
Indebtedness,  (vii) all Indebtedness of other Persons Guaranteed by such Person
to the extent such  Indebtedness  is Guaranteed by such Person and (viii) to the
extent not otherwise  included in this  definition,  obligations  under Currency
Agreements  and Interest  Rate  Agreements.  The amount of  Indebtedness  of any
Person  at any  date  shall  be the  outstanding  balance  at  such  date of all
unconditional  obligations  as described  above and,  with respect to contingent
obligations, the maximum liability upon the occurrence of the contingency giving
rise to the obligation,  provided (A) that the amount outstanding at any time of
any Indebtedness issued with original issue discount is the original issue price
of such Indebtedness,  (B) Permitted Customer Advances,  Prepayment Supports and
any money borrowed, at the time of the Incurrence of any


<PAGE>



Indebtedness, in order to pre-fund the payment of interest on such Indebtedness,
shall be deemed not to be "Indebtedness"  and (C) Indebtedness shall not include
any liability for federal, state, local or other taxes.

                  "Indenture" means this Indenture as originally  executed or as
it may be amended or  supplemented  from time to time by one or more  indentures
supplemental  to  this  Indenture   entered  into  pursuant  to  the  applicable
provisions of this Indenture.

                  "Independent  Financial  Advisor" means an investment  banking
firm,  accounting firm or other financial  advisory firm of national standing in
the United States,  as the case may be, (i) which,  in the judgment of the Board
of Directors, does not, and whose directors, officers or Affiliates do not, have
a material direct or indirect  financial  interest in the Company (provided that
ownership  of  Capital  Stock of the  Company  constituting  less than 2% of all
outstanding  Capital Stock of the Company shall not constitute a material direct
or indirect financial interest), and (ii) which, in the judgment of the Board of
Directors,  is otherwise independent and qualified to perform the task for which
it is to be engaged.

                  "Indirect  Participant"  means a Person who holds an  interest
through a Participant.

                  "Interest Payment Date" means each semiannual interest payment
date of [ ] and [ ] of each year, commencing [ ] 2002.

                  "Interest Rate  Agreement"  means any interest rate protection
agreement,  interest  rate future  agreement,  interest  rate option  agreement,
interest rate swap agreement,  interest rate cap agreement, interest rate collar
agreement,   interest  rate  hedge  agreement  or  other  similar  agreement  or
arrangement   designed  to  protect  the  Company  or  any  of  its   Restricted
Subsidiaries  against  fluctuations in interest rates in respect of Indebtedness
to or under which the Company or any of its Restricted  Subsidiaries  is a party
or a  beneficiary  on the  date of  this  Indenture  or  becomes  a  party  or a
beneficiary hereafter;  provided that the notional principal amount thereof does
not exceed the  principal  amount of the  Indebtedness  of the  Company  and its
Restricted Subsidiaries that bears interest at floating rates.

                  "Investment"  in any  Person  means  any  direct  or  indirect
advance,  loan or other extension of credit (including,  without limitation,  by
way of Guarantee or similar arrangement;  but excluding advances to customers in
the ordinary course of business that are, in conformity  with GAAP,  recorded as
accounts  receivable  on the  balance  sheet of the  Company  or its  Restricted
Subsidiaries)  or capital  contribution  to (by means of any transfer of cash or
other property to others or any payment for property or services for the account
or use of others),  or any  purchase or  acquisition  of Capital  Stock,  bonds,
notes,  debentures or other similar instruments issued by, such Person and shall
include  (i) the  designation  of a  Restricted  Subsidiary  as an  Unrestricted
Subsidiary  and (ii) the fair market  value of the  Capital  Stock (or any other
Investment),  held by the Company or any of its Restricted Subsidiaries,  of (or
in) any Person that has ceased to be a Restricted Subsidiary, including, without
limitation,  by reason of any  transaction  permitted by clause (iii) of Section
4.06  of  this  Indenture.  For  purposes  of the  definition  of  "Unrestricted
Subsidiary" and Section 4.04 of this Indenture, (i) "Investment" shall


<PAGE>



include the fair  market  value of the assets  (net of  liabilities  (other than
liabilities  to the  Company  or any of  its  Subsidiaries))  of any  Restricted
Subsidiary  at the  time  that  such  Restricted  Subsidiary  is  designated  an
Unrestricted  Subsidiary,  (ii) the fair  market  value  of the  assets  (net of
liabilities  (other than liabilities to the Company or any of its Subsidiaries))
of any Unrestricted  Subsidiary at the time that such Unrestricted Subsidiary is
designated  a  Restricted   Subsidiary   shall  be  considered  a  reduction  in
outstanding  Investments  and  (iii)  any  property  transferred  to or  from an
Unrestricted  Subsidiary shall be valued at its fair market value at the time of
such transfer. "Issue Date" means the original date of issuance of the Notes.

                  "Junior Subordinated  Convertible  Debentures" means the 8.75%
Convertible Junior Subordinated Debentures Due 2012 of the Company.

                  "Kingston"   means   Kingston   Communications   International
Limited.

                  "Lien"  means  any  mortgage,   pledge,   security   interest,
encumbrance,  lien or charge of any kind  (including,  without  limitation,  any
conditional  sale or other  title  retention  agreement  or lease in the  nature
thereof or any agreement to give any security interest).

                  "Manager" means Morgan Stanley & Co. Incorporated,  as manager
for  itself  and  the  several  other  underwriters  named  in the  Underwriting
Agreement.

                  "Matra"  means  Matra  Marconi  Space UK  Limited,  the parent
Company of MMS Space Systems and a subsidiary  of Matra Marconi Space N.V.,  and
the manufacturer under the Orion 2 Satellite Contract.

                  "Maturity Date" means the Stated Maturity of the Notes.

                  "Merger" means the merger pursuant to an Agreement and Plan of
Merger dated January 8, 1997, of Old ONSI with a Wholly Owned  subsidiary of the
Company.

                  "Moody's"  means  Moody's  Investors  Service,  Inc.  and  its
successors.

                  "Net Cash Proceeds" means, (a) with respect to any Asset Sale,
the  proceeds  of  such  Asset  Sale in the  form  of cash or cash  equivalents,
including  payments in respect of deferred  payment  obligations  (to the extent
corresponding  to the  principal,  but not  interest,  component  thereof)  when
received  in the form of cash or cash  equivalents  (except to the  extent  such
obligations  are financed or sold with recourse to the Company or any Restricted
Subsidiary)  and proceeds from the  conversion of other  property  received when
converted to cash or cash  equivalents  (including cash or cash equivalents that
are deposited in escrow  pending  satisfaction  of  conditions  specified in the
relevant sale documents or that secures Prepayment  Supports,  in each case when
such cash or cash  equivalents  are  released  to the  Company  or a  Restricted
Subsidiary),  net of (i)  brokerage  commissions  and  other  fees and  expenses
(including fees and expenses of counsel and investment  bankers) related to such
Asset  Sale,  (ii)  provisions  for all taxes  (whether  or not such  taxes will
actually be paid or are payable) as a result of such Asset


<PAGE>

Sale without regard to the consolidated results of operations of the Company and
its  Restricted  Subsidiaries,  taken as a whole,  (iii)  payments made to repay
Indebtedness or any other obligation  outstanding at the time of such Asset Sale
that  either (A) is secured by a Lien on the  property  or assets sold or (B) is
required to be paid as a result of such sale and (iv) appropriate  amounts to be
provided by the Company or any Restricted Subsidiary of the Company as a reserve
against any  liabilities  associated  with such Asset Sale,  including,  without
limitation,  pension and other post-employment benefit liabilities,  liabilities
related to  environmental  matters  and  liabilities  under any  indemnification
obligations  associated  with such Asset Sale,  all as  determined in conformity
with GAAP and (b) with  respect to any  issuance or sale of Capital  Stock,  the
proceeds  of such  issuance  or sale  in the  form of cash or cash  equivalents,
including  payments in respect of deferred  payment  obligations  (to the extent
corresponding  to the  principal,  but not  interest,  component  thereof)  when
received  in the form of cash or cash  equivalents  (except to the  extent  such
obligations  are financed or sold with recourse to the Company or any Restricted
Subsidiary  of the Company) and proceeds from the  conversion of other  property
received when  converted to cash or cash  equivalents,  net of attorney's  fees,
accountants'  fees,  underwriters'  or  placement  agents'  fees,  discounts  or
commissions and brokerage, consultant and other fees incurred in connection with
such issuance or sale and net of taxes paid or payable as a result thereof.

                  "Note  Guarantee" means the Guarantee by the Guarantors of the
Company's  obligations  under  the  Notes  and the  Indenture,  pursuant  to the
Indenture, and the Guarantee by any other Person that becomes a Guarantor of the
Company's obligations under the Notes and the Indenture.

                  "Notes" means the  [___________]%  Senior  Discount  Notes due
2007 of the Company issued pursuant to this Indenture.

                  "Offer to  Purchase"  means an offer to purchase  Notes by the
Company  from the Holders  commenced by mailing a notice to the Trustee and each
Holder stating:  (i) the covenant  pursuant to which the offer is being made and
that all Notes  validly  tendered  will be  accepted  for  payment on a pro rata
basis;  (ii) the  purchase  price  and the date of  purchase  (which  shall be a
Business  Day no earlier  than 30 days nor later than 60 days from the date such
notice is mailed) (the  "Payment  Date");  (iii) that any Note not tendered will
continue to accrue interest pursuant to its terms; (iv) that, unless the Company
defaults in the payment of the  purchase  price,  any Note  accepted for payment
pursuant  to the Offer to Purchase  shall cease to accrue  interest on and after
the Payment Date; (v) that Holders electing to have a Note purchased pursuant to
the Offer to Purchase will be required to surrender the Note,  together with the
form  entitled  "Option of the Holder to Elect  Purchase" on the reverse side of
the Note completed,  to the Paying Agent at the address  specified in the notice
prior to the close of business on the Business  Day  immediately  preceding  the
Payment Date;  (vi) that Holders will be entitled to withdraw  their election if
the Paying  Agent  receives,  not later than the close of  business on the third
Business Day  immediately  preceding  the Payment  Date,  a telegram,  facsimile
transmission  or letter  setting  forth the name of such Holder,  the  principal
amount at maturity of Notes  delivered  for purchase  and a statement  that such
Holder is withdrawing his election to have such Notes purchased;  and (vii) that
Holders whose Notes are being purchased only in part will be


<PAGE>



issued  new Notes  equal in  principal  amount at  maturity  to the  unpurchased
portion of the Notes surrendered; provided that each Note purchased and each new
Note  issued  shall be in a  principal  amount at maturity of $1,000 or integral
multiples thereof. On the Payment Date, the Company shall (i) accept for payment
on a pro rata basis Notes or portions thereof  tendered  pursuant to an Offer to
Purchase;  (ii)  deposit  with the  Paying  Agent  money  sufficient  to pay the
purchase price of all Notes or portions thereof so accepted;  and (iii) deliver,
or cause to be  delivered,  to the  Trustee  all Notes or  portions  thereof  so
accepted together with an Officers' Certificate specifying the Notes or portions
thereof  accepted  for payment by the Company.  The Paying Agent shall  promptly
mail to the  Holders  of Notes so  accepted  payment  in an amount  equal to the
purchase  price,  and the Trustee shall promptly  authenticate  and mail to such
Holders a new Note equal in  principal  amount at  maturity  to any  unpurchased
portion of the Note surrendered;  provided that each Note purchased and each new
Note  issued  shall be in a  principal  amount at maturity of $1,000 or integral
multiples thereof. The Company will publicly announce the results of an Offer to
Purchase as soon as practicable after the Payment Date. The Trustee shall act as
the Paying  Agent for an Offer to  Purchase.  The Company  will comply with Rule
14e-1  under the  Exchange  Act and any other  securities  laws and  regulations
thereunder to the extent such laws and regulations are applicable,  in the event
that the  Company  is  required  to  repurchase  Notes  pursuant  to an Offer to
Purchase.

                  "Old  ONSI"  means the  Delaware  corporation  known as "Orion
Network Systems, Inc." prior to the consummation of the Merger.

                  "Orion  Atlantic"  means   International   Private   Satellite
Partners, L.P., a Delaware Limited Partnership.

                  "Orion  1"  means  the   high-power   Ku-band   communications
satellite operated over the Atlantic Ocean by Orion.

                  "Orion 2" and "Orion 3" mean, respectively,  each of the first
two satellites  with respect to which the Company has a Successful  Launch after
the Closing Date, and any replacement for either of such satellites.

                  "Orion 1 Satellite  Contract"  means the fixed  price  turnkey
contract  originally  entered into between British  Aerospace and Orion Atlantic
for the design, construction, launch and delivery in orbit of Orion 1.

                  "Orion 2 Satellite  Contract"  means the  spacecraft  purchase
agreement  between Orion and Matra Marconi Space for  construction and launch of
Orion 2.

                  "Officer" means, with respect to the Company, (i) the Chairman
of the Board,  the Chief Executive  Officer or any other Director of the Company
or (ii) the Treasurer or any Assistant  Treasurer,  the Company Secretary or any
Company Assistant Secretary.

                  "Officers'  Certificate"  means a  certificate  signed  by one
Officer listed in clause (i) of the definition thereof and one Officer listed in
clause (ii) of the definition thereof;


<PAGE>



provided,  however,  that any such  certificate  may be signed by any two of the
Officers listed in clause (i) of the definition  thereof in lieu of being signed
by one Officer  listed in clause (i) of the  definition  thereof and one Officer
listed in clause (ii) of the  definition  thereof.  Each  Officers'  Certificate
(other than  certificates  provided  pursuant to TIA  Section  314(a)(4))  shall
include the statements provided for in TIA Section 314(e), if applicable.

                  "Opinion of Counsel"  means a written  opinion signed by legal
counsel who may be an employee of or counsel to the  Company.  Each such Opinion
of Counsel shall include the statements  provided for in TIA Section 314(e),  if
applicable.

                  "Participant" means, with respect to the Depositary,  a Person
who has an account therewith.

                  "Paying  Agent" has the  meaning  provided  in  Section  2.03,
except that,  for the purposes of Article  Eight,  the Paying Agent shall not be
the Company or a Subsidiary  of the Company or an Affiliate of any of them.  The
term "Paying Agent" includes any additional Paying Agent.

                  "Payment  Date" means with  respect to any Offer to  Purchase,
the date of purchase of the Notes  pursuant  thereto,  which shall be a Business
Day no  earlier  than 30 days nor  later  than 60 days from the date a notice is
mailed pursuant to such Offer to Purchase.

                  "Permitted Customer Advances" means obligations of the Company
or any  Restricted  Subsidiary  to repay  money  received by the Company or such
Restricted  Subsidiary from customers as bona fide prepayment for services to be
provided  by, or  purchases  to be made from,  the  Company  or such  Restricted
Subsidiary.

                  "Permitted  Investment" means (i) an Investment in the Company
or a  Restricted  Subsidiary  or a Person  which  will,  upon the making of such
Investment,  become a Restricted Subsidiary or be merged or consolidated with or
into or transfer or convey all or  substantially  all its assets to, the Company
or a Restricted  Subsidiary;  provided  that such person's  primary  business is
related,  ancillary or  complementary  to the  businesses of the Company and its
Restricted  Subsidiaries  on the date of such  Investment;  (ii)  Temporary Cash
Investments;  (iii) payroll,  travel and similar  advances to cover matters that
are expected at the time of such  advances  ultimately to be treated as expenses
in accordance with GAAP; and (iv) stock,  obligations or securities  received in
satisfaction of judgments.

                  "Permitted  Liens"  means (i) Liens  for  taxes,  assessments,
governmental  charges  or  claims  that are  being  contested  in good  faith by
appropriate legal proceedings  promptly instituted and diligently  conducted and
for which a reserve or other appropriate provision, if any, as shall be required
in  conformity  with GAAP shall have been made;  (ii)  statutory  and common law
Liens  of  landlords   and   carriers,   warehousemen,   mechanics,   suppliers,
materialmen,  repairmen or other similar Liens arising in the ordinary course of
business and with respect to amounts not yet  delinquent  or being  contested in
good faith by appropriate legal proceedings  promptly  instituted and diligently
conducted and for which a reserve or other appropriate


<PAGE>



provision,  if any, as shall be required in conformity with GAAP shall have been
made;  (iii) Liens incurred or deposits made in the ordinary  course of business
in connection with workers' compensation, unemployment insurance and other types
of  social  security;  (iv)  Liens  incurred  or  deposits  made to  secure  the
performance  of tenders,  bids,  leases,  statutory or  regulatory  obligations,
bankers' acceptances, surety and appeal bonds, government contracts, performance
and return-of-money  bonds and other obligations of a similar nature incurred in
the ordinary  course of business  (exclusive of  obligations  for the payment of
borrowed money); (v) easements,  rights-of-way,  municipal and zoning ordinances
and similar charges, encumbrances, title defects or other irregularities that do
not materially  interfere with the ordinary course of business of the Company or
any of  its  Restricted  Subsidiaries;  (vi)  Liens  (including  extensions  and
renewals  thereof)  upon real or personal  property  acquired  after the Closing
Date;  provided that (a) such Lien is created solely for the purpose of securing
Indebtedness Incurred, in accordance with Section 4.03 of this Indenture, (1) to
finance the cost (including the cost of improvement, transportation, development
and design,  installation,  integration or construction) of the item of property
or assets  subject  thereto and such Lien is created prior to, at the time of or
within  six  months  after  the  later of the  acquisition,  the  completion  of
construction  or the  commencement  of full operation of such property or (2) to
refinance any  Indebtedness  previously so secured,  (b) the principal amount of
the  Indebtedness  secured by such Lien does not exceed 100% of such cost (plus,
in the case of any  refinancing  Indebtedness  referred to in clause  (vi)(a)(2)
above, premiums, accrued interest, fees and expenses), (c) any Lien permitted by
this clause  shall not extend to or cover any property or assets other than such
item of property or assets and any  improvements on such item and (d) such Liens
may not  relate to Orion 2 or Orion 3;  (vii)  leases or  subleases  granted  to
others that do not materially  interfere with the ordinary course of business of
the Company and its  Restricted  Subsidiaries,  taken as a whole;  (viii)  Liens
encumbering  property or assets  under  construction  arising  from  progress or
partial  payments by a customer of the  Company or its  Restricted  Subsidiaries
relating to such  property or assets;  (ix) any interest or title of a lessor in
the property  subject to any  Capitalized  Lease or operating  lease;  (x) Liens
arising from filing  Uniform  Commercial  Code  financing  statements  regarding
leases; (xi) Liens on property of, or on shares of Capital Stock or Indebtedness
of, any Person existing at the time such Person  becomes,  or becomes a part of,
any  Restricted  Subsidiary;  provided that such Liens do not extend to or cover
any property or assets of the Company or any  Restricted  Subsidiary  other than
the  property  or assets  acquired;  (xii)  Liens in favor of the Company or any
Restricted  Subsidiary;  (xiii)  Liens  arising  from the  rendering  of a final
judgment  or order  against  the  Company or any  Restricted  Subsidiary  of the
Company  that does not give rise to an Event of Default;  (xiv)  Liens  securing
reimbursement  obligations  with  respect  to letters  of credit  that  encumber
documents and other property relating to such letters of credit and the products
and  proceeds  thereof;  (xv) Liens in favor of customs and revenue  authorities
arising as a matter of law to secure  payment of  customs  duties in  connection
with the  importation  of  goods;  (xvi)  Liens  encumbering  customary  initial
deposits  and margin  deposits,  and other  Liens  that are  within the  general
parameters  customary in the  industry  and  incurred in the ordinary  course of
business, in each case, securing Indebtedness under Interest Rate Agreements and
Currency Agreements and forward contracts,  options,  future contracts,  futures
options or similar  agreements or  arrangements  designed  solely to protect the
Company or any of its  Restricted  Subsidiaries  from  fluctuations  in interest
rates,  currencies  or the price of  commodities;  (xvii)  Liens  arising out of
conditional sale, title retention, consignment or similar arrangements


<PAGE>



 for the sale of goods  entered  into by the  Company  or any of its  Restricted
Subsidiaries  in the  ordinary  course of business in  accordance  with the past
practices of the Company and its  Restricted  Subsidiaries  prior to the Closing
Date;  (xviii) Liens on or sales of receivables;  (xix) Liens  (including  Liens
securing Prepayment  Supports) on amounts of money or Temporary Cash Investments
that each represent  bona fide  prepayments of at least $5 million on agreements
for the  long-term  sale or  lease of  capacity  on any  satellite  owned by the
Company or a  Restricted  Subsidiary,  but only to the extent that the amount of
money or Temporary Cash Investments subject to any such Lien does not exceed the
amount  of  such  prepayment  and  reasonable   interest  thereon;   (xx)  Liens
encumbering  contracts between the Company or any Restricted  Subsidiary and any
third party  customer  relating to the use of a VSAT owned by the Company or any
Restricted  Subsidiary but only if, and so long as, the Indebtedness  secured by
any such Lien is also  secured by a Lien  permitted  under  clause  (vi) of this
definition  encumbering  such  VSAT;  and  (xxi)  Liens  upon  a  satellite  and
components   thereof  during  the  period  in  which  such  satellite  is  being
constructed,  provided  that (a) such Liens (1) are for the  benefit of only the
manufacturer  of such satellite or components and (2) secure only the obligation
of the Company or any  Restricted  Subsidiary to pay the purchase price for such
satellite or components and (b) such Liens are actually  released upon, or prior
to, the completion of  construction of such satellite and prior to the launch or
commencement of full operations of such satellite.

                  "Person" means any individual, corporation, partnership, joint
venture,  trust,  unincorporated  organization  or  government  or any agency or
political subdivision thereof.

                  "Prepayment  Support" means the  reimbursement  obligations of
the Company or any  Restricted  Subsidiary in connection  with any fully secured
letter  of credit  or  similar  credit  support  issued  by any  third  party in
connection with the obligations of the Company or such Restricted  Subsidiary to
repay  amounts  received  as bona fide  prepayments  of at least $5  million  on
agreements for the long-term  sale or lease of capacity on a satellite  owned by
the Company or a Restricted Subsidiary.

                  "Redemption  Date,"  when used with  respect to any Note to be
redeemed,  means  the date  fixed for such  redemption  by or  pursuant  to this
Indenture.

                  "Redemption  Indebtedness"  means  Indebtedness of the Company
which  is  (i)   subordinated  in  right  of  payment  of  the  Notes  on  terms
substantially similar to the terms contained, on the Closing Date, in Article 14
of the Debenture Purchase  Agreement (but excluding the terms contained,  on the
Closing  Date,  in Section 14.7 of the Debenture  Purchase  Agreement)  and (ii)
Incurred  for the sole  purpose  of  financing  the  redemption,  repurchase  or
acquisition of shares of Series A Preferred Stock or Series B Preferred Stock.

                  "Redemption  Price,"  when used with respect to any Note to be
redeemed,  means the price at which such Note is to be redeemed pursuant to this
Indenture.

                  "Register" has the meaning provided in Section 2.03.

                  "Registrar" has the meaning provided in Section 2.03.


<PAGE>





                  "Regular Record Date" for the interest payable on any Interest
Payment Date means the [_______] or [_______]  (whether or not a Business  Day),
as the case may be, next preceding such Interest Payment Date.

                  "Related  Person"  means any holder (or any  Affiliate of such
holder)  of 5% or more of any  class of  Capital  Stock of the  Company  and any
Affiliate of the Company or any Restricted Subsidiary.

                  "Released Indebtedness" means, with respect to any Asset Sale,
Indebtedness (i) which is owed by the Company or any Restricted  Subsidiary (the
"Obligors")  prior to such Asset Sale, (ii) which is assumed by the purchaser or
any affiliate  thereof in connection with such Asset Sale and (iii) with respect
to the Obligors receive written,  unconditional  releases from each creditor, no
later than the closing date of such Asset Sale.

                  "Responsible  Officer," when used with respect to the Trustee,
means the chairman or any vice chairman of the board of directors,  the chairman
or any vice chairman of the executive  committee of the board of directors,  the
chairman  of the  trust  committee,  the  president,  any  vice  president,  any
assistant vice president, the secretary, any assistant secretary, the treasurer,
any assistant  treasurer,  the cashier, any assistant cashier, any trust officer
or assistant  trust officer,  the controller or any assistant  controller or any
other officer of the Trustee customarily  performing  functions similar to those
performed by any of the above designated  officers and also means,  with respect
to a particular corporate trust matter, any other officer to whom such matter is
referred  because of his or her knowledge of and familiarity with the particular
subject.

                  "Restricted  Payments"  has the  meaning  provided  in Section
4.04.

                  "Restricted  Subsidiary"  means any  Subsidiary of the Company
other than an Unrestricted Subsidiary.

                  "S&P"  means   Standard  &  Poor's   Ratings   Group  and  its
successors.

                  "Securities  Act" means the United  States  Securities  Act of
1933, as amended.

                  "Separation  Date" means the  earliest of (i) six months after
the  date  of  issuance,  (ii)  such  date as the  Underwriters  may,  in  their
discretion,  deem appropriate and (ii) in the event of an Offer to Purchase, the
date the Company mails notice thereof to holders of the Notes.

                  "Series A Preferred  Stock"  means the  Company's  Series A 8%
Cumulative Redeemable Convertible Preferred Stock, par value $0.01 per share.

                  "Series B Preferred  Stock"  means the  Company's  Series B 8%
Cumulative Redeemable Convertible Preferred Stock, par value $0.01 per share.


<PAGE>





                  "Significant  Subsidiary" means, at any date of determination,
any Restricted Subsidiary that, together with its Subsidiaries, (i) for the most
recent  fiscal  year  of  the  Company,  accounted  for  more  than  10%  of the
consolidated revenues of the Company and its Restricted  Subsidiaries or (ii) as
of the  end of  such  fiscal  year,  was  the  owner  of  more  than  10% of the
consolidated assets of the Company and its Restricted  Subsidiaries,  all as set
forth on the most recently available  consolidated  financial  statements of the
Company for such fiscal year.

                  "Specified  Date" means any Redemption  Date, any Payment Date
for an Offer to Purchase pursuant to Section 4.11 or Section 4.13 or any date on
which the Securities are due and payable after an Event of Default.

                  "Stated   Maturity"  means,  (i)  with  respect  to  any  debt
security,  the date  specified in such debt  security as the fixed date on which
the final  installment of principal of such debt security is due and payable and
(ii) with respect to any  scheduled  installment  of principal of or interest on
any debt security, the date specified in such debt security as the fixed date on
which such installment is due and payable.

                  "Subsidiary"   means,   with   respect  to  any  Person,   any
corporation,  association or other business entity of which more than 50% of the
voting power of the outstanding  Voting Stock is owned,  directly or indirectly,
by such Person and one or more other Subsidiaries of such Person.

                  "Subsidiary Guarantee" means the Guarantee of the Notes by any
Subsidiary of the Company substantially in the form of Exhibit F hereto.

                  "Successful Launch" means, with respect to any satellite,  the
placing into orbit of such  satellite in its assigned  orbital  position with at
least 40% of the transponder capacity fully operational.

                  "Tax" means any tax, duty, levy,  impost,  assessment or other
governmental  charge  (including  penalties,  interest and any other liabilities
related thereto).

                  "Taxing   Authority"   means  any   government   or  political
subdivision  or territory or  possession  of any  government or any authority or
agency therein or thereof having power to tax.

                  "Temporary Cash  Investment"  means any of the following:  (i)
direct  obligations  of the United  States of  America or any agency  thereof or
obligations fully and unconditionally guaranteed by the United States of America
or any agency thereof,  (ii) time deposit accounts,  certificates of deposit and
money  market  deposits  maturing  within  180 days of the  date of  acquisition
thereof  issued by a bank or trust company which is organized  under the laws of
the  United  States  of  America,  any  state  thereof  or any  foreign  country
recognized  by the United  States,  and which bank or trust company has capital,
surplus  and  undivided  profits  aggregating  in excess of $50  million (or the
foreign currency equivalent thereof) and has outstanding debt which is rated "A"
(or such  similar  equivalent  rating)  or  higher  by at least  one  nationally
recognized  statistical  rating  organization  (as defined in Rule 436 under the
Securities Act) or any


<PAGE>



 money-market  fund  sponsored  by a  registered  broker  dealer or mutual  fund
distributor,  (iii) repurchase  obligations with a term of not more than 30 days
for  underlying  securities  of the types  described in clause (i) above entered
into with a bank meeting the qualifications described in clause (ii) above, (iv)
commercial paper,  maturing not more than 90 days after the date of acquisition,
issued by a corporation  (other than an Affiliate of the Company)  organized and
in existence  under the laws of the United States of America,  any state thereof
or any foreign country  recognized by the United States of America with a rating
at the time as of which any  investment  therein  is made of "P-1"  (or  higher)
according to Moody's or "A-1" (or higher)  according to S&P, and (v)  securities
with  maturities  of six months or less from the date of  acquisition  issued or
fully and unconditionally  guaranteed by any state, commonwealth or territory of
the  United  States  of  America,  or by any  political  subdivision  or  taxing
authority thereof, and rated at least "A" by S&P or Moody's.

                  "TIA" or "Trust  Indenture  Act" means the United States Trust
Indenture  Act of 1939,  as amended  (15 U.S.  Code ss.ss.  77aaa-77bbb),  as in
effect on the date this  Indenture was  executed,  except as provided in Section
9.06.

                  "Trade  Payables"  means,  with  respect  to any  Person,  any
accounts  payable or any other  indebtedness  or  monetary  obligation  to trade
creditors  created,  assumed  or  Guaranteed  by  such  Person  or  any  of  its
Subsidiaries  arising in the ordinary  course of business in connection with the
acquisition of goods or services.

                  "Transaction  Date" means,  with respect to the  Incurrence of
any Indebtedness by the Company or any of its Restricted Subsidiaries,  the date
such Indebtedness is to be Incurred and, with respect to any Restricted Payment,
the date such Restricted Payment is to be made.

                  "TT&C Financing" means the agreement, dated November 23, 1993,
between  General  Electric  Capital  Corporation  and  International   Satellite
Partners, L.P. ("Orion Atlantic"), relating to borrowings by Orion Atlantic.

                  "Trustee" means the party named as such in the first paragraph
of  this  Indenture  until  a  successor  replaces  it in  accordance  with  the
provisions  of  Article  Seven  of this  Indenture  and  thereafter  means  such
successor.

                  "Underwriters"   has  the   meaning   as  set   forth  in  the
Underwriting Agreement.

                  "Underwriting Agreement" means the Underwriting Agreement date
[ ] 1997  between  the  Company  and the  Manager,  for  itself  and  the  other
Underwriters named therein.

                  "Units"  has the  meaning  provided  in the  recitals  to this
Indenture.

                  "Unrestricted  Subsidiary"  means  (i) any  Subsidiary  of the
Company that at the time of  determination  shall be designated an  Unrestricted
Subsidiary by the Board of Directors in the manner  provided  below and (ii) any
Subsidiary of an Unrestricted  Subsidiary.  The Board of Directors may designate
any Restricted Subsidiary (including any newly acquired or newly


<PAGE>



formed  Subsidiary of the Company) to be an Unrestricted  Subsidiary unless such
Subsidiary  owns any Capital Stock of, or owns or holds any Lien on any property
of, the Company or any Restricted Subsidiary; provided that (A) any Guarantee by
the Company or any Restricted  Subsidiary of any  Indebtedness of the Subsidiary
being so designated shall be deemed an "Incurrence" of such  Indebtedness and an
"Investment"  by  the  Company  or  such  Restricted  Subsidiary  (or  both,  if
applicable) at the time of such designation; (B) either (I) the Subsidiary to be
so designated has total assets of $1,000 or less or (II) if such  Subsidiary has
assets greater than $1,000,  such  designation  would be permitted under Section
4.04 of this  Indenture,  and (C) if applicable,  the Incurrence of Indebtedness
and the Investment  referred to in clause (A) of this proviso would be permitted
under  Section 4.03 and Section 4.04 of this  Indenture.  The Board of Directors
may  designate  any  Unrestricted  Subsidiary  to  be a  Restricted  Subsidiary;
provided  that  immediately  after  giving  effect to such  designation  (x) the
Company could Incur $1.00 of additional  Indebtedness  under the first paragraph
of Section 4.03 of this  Indenture  and (y) no Default or Event of Default shall
have occurred and be continuing.  Any such designation by the Board of Directors
shall be evidenced to the Trustee by promptly  filing with the Trustee a copy of
the  Board  Resolution  giving  effect  to  such  designation  and an  Officers'
Certificate  certifying  that  such  designation  complied  with  the  foregoing
provisions.

                  "Voting  Stock"  means,  with  respect to any Person,  Capital
Stock of any class or kind ordinarily  having the power to vote for the election
of directors,  managers or other voting  members of the  governing  body of such
Person.

                  "Warrants"  means the warrants to purchase Common Stock of the
Company issued as part of a unit with each of the Notes and the Senior Notes.

                  "Wholly  Owned" means,  with respect to any  Subsidiary of any
Person, the ownership of all of the outstanding Capital Stock of such Subsidiary
(other than any director's qualifying shares or Investments by foreign nationals
mandated  by  applicable  law)  by  such  Person  or one or  more  Wholly  Owned
Subsidiaries of such Person.

                  SECTION 1.02.  Incorporation  by Reference of Trust  Indenture
Act . Whenever this  Indenture  refers to a provision of the TIA, such provision
is incorporated by reference in and made a part of this Indenture. The following
TIA terms used in this Indenture have the following meanings:

                  "indenture securities" means the Notes;

                  "indenture security holder" means a Holder;

                  "indenture to be qualified" means this Indenture;

                  "indenture  trustee"  or  "institutional  trustee"  means  the
Trustee; and

                  "obligor" on the indenture securities means the Company or any
other obligor on the Notes.


<PAGE>





                  All other TIA terms used in this Indenture that are defined by
the TIA, defined by TIA reference to another statute or defined by a rule of the
Commission and not otherwise  defined herein have the meanings  assigned to them
therein.

                  SECTION  1.03.  Rules of  Construction  . Unless  the  context
otherwise requires:

                  (i)      a term has the meaning assigned to it;

                  (ii) an accounting term not otherwise  defined has the meaning
         assigned to it in accordance with GAAP;

                  (iii)    "or" is not exclusive;

                  (iv) words in the  singular  include the plural,  and words in
         the plural include the singular;

                  (v) provisions apply to successive events and transactions;

                  (vi)  "herein,"  "hereof"  and other  words of similar  import
         refer to this Indenture as a whole and not to any  particular  Article,
         Section or other subdivision;

                  (vii) all  references to Sections,  Articles or Exhibits refer
         to Sections,  Articles or Exhibits of this Indenture  unless  otherwise
         indicated; and

                  (viii) references to sections of or rules under the Securities
         Act shall be deemed to include  substitute,  replacement  or  successor
         sections of the Securities Act or rules adopted by the Commission  from
         time to time.


                                   ARTICLE TWO
                                    THE NOTES

                  SECTION 2.01.  Form and Dating . (a) Global  Notes.  The Notes
offered  and sold  shall be issued in the form of one or more  fully  registered
Notes in global form ("Global Notes"), which shall be deposited on behalf of the
purchasers of the Notes represented  thereby with the Depositary at its New York
corporate trust office,  duly executed by the Company and  authenticated  by the
Trustee as hereinafter  provided.  The Notes in definitive  form  ("Certificated
Notes") shall not be issued except as provided in Section 2.07(a). The aggregate
principal  amount of each of the Global Notes may from time to time be increased
or decreased by  adjustments  made on the records of the Trustee as  hereinafter
provided.

                  Each Global Note shall represent such of the outstanding Notes
as shall be specified therein and each shall provide that it shall represent the
aggregate  principal  amount of  outstanding  Notes  from time to time  endorsed
thereon and that the aggregate principal amount of outstanding Notes represented
thereby may from time to time be reduced or increased, as


<PAGE>



appropriate,  to reflect  exchanges,  redemptions  and  transfers  of  interests
therein in accordance  with the terms of this  Indenture.  Any  endorsement of a
Global Note to reflect the amount of any  increase or decrease in the  principal
amount of outstanding Notes represented  thereby shall be made by the Trustee in
accordance with instructions  given by the Holder thereof as required by Section
2.07 hereof.

                  Except as set forth in  Section  2.07(a)  hereof,  the  Global
Notes may not be transferred except as a whole by the Depositary to a nominee of
the  Depositary or by the nominee of the Depositary to the Depositary or another
nominee  of  the  Depositary  or by the  nominee  of  the  Depositary  or by the
Depositary of any such nominee to a successor of the  Depositary or a nominee of
each successor.

                  (b) Book-Entry  Provisions.  The Company shall execute and the
Trustee shall,  in accordance with this Section 2.01(b) and Section 2.02 hereof,
authenticate and deliver the Global Notes to the Depositary.

                  Upon receipt of each Global Note  authenticated  and delivered
by  the  Trustee,  the  Depositary  shall  credit,  on its  internal  book-entry
registration and transfer system, its Participant's accounts with the respective
interests owned by such Participants.  Ownership of beneficial  interests in the
Global Notes shall be limited to Participants and Indirect Participants.

                  So long as the  Depositary  is the  registered  holder  of any
Global Note, the  Participants  and Indirect  Participants  shall have no rights
under this  Indenture  or under any Global Note with respect to such Global Note
held on their behalf by the Depositary, and the Depositary may be treated by the
Company, the Trustee and any agent of the Company or the Trustee as the absolute
owner of such Global Note for the purpose of receiving  payment of or on account
of the principal of and,  subject to the provisions of this Indenture,  interest
on the Global Notes and for all other purposes.  Notwithstanding  the foregoing,
nothing  herein  shall  impair  the  operation  of  customary  practices  of the
Depositary  governing  the  exercise  of the rights of an owner of a  beneficial
interest in any Global Note.  No  beneficial  owner of an interest in any Global
Note shall be able to  transfer  such  interest  except in  accordance  with the
Applicable Procedures.

                  (c) Note  Forms.  The  provisions  of the form of Global  Note
contained in Exhibits A hereto are incorporated herein by reference.

                  (d)  Dating.  Each  Note  shall  be  dated  the  date  of  its
authentication.

                  SECTION 2.02.  Execution and  Authentication.  Any director of
the  Company  shall  execute  the Notes on behalf  of the  Company  by manual or
facsimile  signature.  The Company's  common seal may be reproduced on the Notes
and may be in facsimile form.


<PAGE>




                  If the director  whose  manual or facsimile  signature is on a
Note no longer holds that office at the time the Trustee  authenticates the Note
or at any time thereafter, the Note nevertheless shall be valid.

                  A Note shall not be valid until an  authorized  officer of the
Trustee  manually signs the  certificate  of  authentication  on the Note.  Such
signature  shall be  conclusive  evidence  that the Note has been  authenticated
under this Indenture.

                  The Trustee shall  authenticate Notes for original issue in an
aggregate  principal  amount at  maturity  not to exceed $[ ] upon  receipt of a
certificate  signed by any Officer or  attorney-in-fact  therefor  directing the
Trustee to  authenticate  the Notes.  The Global Notes shall be issuable only in
fully  registered  form  and the  Certificated  Notes  shall  be  issuable  only
registered  form.  The  Notes  shall  be  issued  without  coupons  and  only in
denominations  of U.S.  $1,000  principal  amount at  maturity  or any  integral
multiple thereof.

                  The Trustee may appoint an authenticating  agent acceptable to
the  Company  to  authenticate  Notes.  Unless  limited  by the  terms  of  such
appointment, an authenticating agent may authenticate Notes whenever the Trustee
may do so. Each  reference in this  Indenture to  authentication  by the Trustee
includes  authentication by such agent. Such authenticating agent shall have the
same rights as the Trustee in any  dealings  hereunder  with the Company or with
any of the Company's Affiliates.

                  SECTION 2.03.  Registrar  and Paying Agent.  The Company shall
maintain  an office or agency  where  Certificated  Notes may be  presented  for
registration of transfer or for exchange (the "Registrar"),  an office or agency
where Notes may be presented for payment (the "Paying Agent"),  and an office or
agency where  notices and demands to or upon the Company in respect of the Notes
and this  Indenture  may be  served,  in each case,  located  in the  Borough of
Manhattan,  The City of New York,  State of New York. The Registrar shall keep a
register  containing the names and addresses of all Holders (the "Register") and
of the transfer and exchange of Certificated Notes. Any notice to be given under
this Indenture or under the Notes by the Trustee or the Company to Holders shall
be mailed by first class mail to each Holder at its address as it appears at the
time  of  such  mailing  in the  Register.  The  Company  may  have  one or more
co-Registrars and one or more additional paying agents.  The term "Paying Agent"
includes any additional paying agent.  Except as otherwise  provided herein, the
Company or any Subsidiary  thereof may act as Paying Agent. The Company may also
from time to time  designate  one or more other  offices or  agencies  where the
Notes may be presented or surrendered  for any or all such purposes and may from
time to time rescind  such  designations.  The Company will give prompt  written
notice to the Trustee of any such designation or rescission and of any change in
the location of any such other office or agency.

                  The Company shall enter into an appropriate  agency  agreement
with any  Agent  not a party to this  Indenture,  which  shall  incorporate  the
provisions of the TIA. The  agreement  shall  implement  the  provisions of this
Indenture that relate to such Agent. The Company shall notify the Trustee of the
name and address of any such Agent. If the Company fails to maintain


<PAGE>



a Registrar or Paying Agent, or fails to give the foregoing notice,  the Trustee
shall  act as  such  and  shall  be  entitled  to  appropriate  compensation  in
accordance with Section 7.07.

                  The Company  initially  appoints the Corporate Trust Office of
the  Trustee in the  Borough of  Manhattan  located at the  address set forth in
Section  11.02 as  Registrar,  Paying Agent and agent for service of notices and
demands in connection with the Notes and this Indenture.

                  SECTION  2.04.  Holders to Be Treated as Owners;  Payments  of
Interest . (a) The Company, the Paying Agent, the Registrar, the Trustee and any
agent of the Company,  the Paying  Agent,  the Registrar or the Trustee may deem
and  treat  each  Holder  of a Note as the  absolute  owner of such Note for the
purpose of receiving  payment of or on account of the principal of and,  subject
to the provisions of this Indenture, and interest on such Note and for all other
purposes.  Neither the Company, the Paying Agent, the Registrar, the Trustee nor
any agent of the Company,  the Paying Agent,  the Registrar or the Trustee shall
be affected by any notice to the contrary. All such payments so made to any such
Person, or upon his order, shall be valid, and, to the extent of the sum or sums
so paid,  effectual to satisfy and discharge  the  liability for moneys  payable
upon any Note.

                  (b) The Holder of a Certificated Note at the close of business
on the Regular  Record Date with respect to any  Interest  Payment Date shall be
entitled  to  receive  the  interest  payable  on  such  Interest  Payment  Date
notwithstanding any transfer or exchange of such Certificated Note subsequent to
the Regular Record Date and prior to such Interest  Payment Date,  except if and
to the extent the Company  shall  default in the payment of the  interest due on
such Interest Payment Date, in which case such defaulted  interest shall be paid
in accordance with Section 2.13; provided that, in the event of an exchange of a
Certificated  Note for a beneficial  interest in any Global Note subsequent to a
Regular  Record Date or any  special  record date and prior to or on the related
Interest Payment Date, any payment of interest payable on such payment date with
respect to any such  Certificated Note shall be made to the Person in whose name
such Certificated Note was registered on such record date.  Payments of interest
on the  Global  Notes  will be made to the  Holder  of the  Global  Note on each
Interest  Payment Date;  provided  that, in the event of an exchange of all or a
portion of the Global  Note for  Certificated  Notes  subsequent  to the Regular
Record Date or any special  record date and prior to or on the related  Interest
Payment Date or other payment date under  Section 2.13,  any payment of interest
payable on such payment date with respect to the Certificated Note shall be made
to the Holder of the Global Note.

                  (c) The Trustee  shall pay  interest to the  Depositary,  with
respect to any Global  Note the  Depositary,  in  accordance  with  instructions
received from the  Depositary at least five business days before the  applicable
Interest Payment Date.

                  SECTION 2.05. Paying Agent to Hold Money in Trust. The Company
shall  require each Paying Agent other than the Trustee to agree in writing that
such  Paying  Agent  will hold in trust for the  benefit  of the  Holders or the
Trustee all money held by the Paying  Agent for the payment of  principal  of or
interest on the Notes (whether such money has been paid to


<PAGE>



 it by the Company or any other  obligor on the Notes),  and the Company and the
Paying  Agent  shall  notify the  Trustee of any  default by the Company (or any
other  obligor on the Notes) in making any such  payment.  Unless the Company or
any Subsidiary is the Paying Agent, money held in trust by the Paying Agent need
not be  segregated  except as  required  by law and in no event shall the Paying
Agent be liable for any  interest  on any money  received by it  hereunder.  The
Company at any time may require the Paying  Agent to pay all money held by it to
the Trustee and account for any funds  disbursed and the Trustee may at any time
during the  continuance of any Event of Default  specified in Section 6.01(a) or
(b), upon written request to the Paying Agent,  require such Paying Agent to pay
forthwith  all money so held by it to the  Trustee  and to account for any funds
disbursed.  Upon making  such  payment,  the Paying  Agent shall have no further
liability  for  the  money  delivered  to the  Trustee.  If the  Company  or any
Subsidiary  of the Company acts as Paying Agent it shall,  on or before each due
date of the  principal of or interest on the Notes,  segregate and hold in trust
for the  benefit of the Persons  entitled  thereto a sum  sufficient  to pay the
principal  or  interest  so  becoming  due until such sums shall be paid to such
Persons or otherwise disposed of as herein provided and will promptly notify the
Trustee of its action or failure so to act.

                  SECTION 2.06.  Holder Lists.  The Trustee shall preserve in as
current a form as is reasonably practicable the most recent list available to it
from the  Registrar of the names and  addresses of the Holders of Notes.  If the
Trustee is not the Registrar,  the Company shall furnish to the Trustee at least
five Business Days before each Interest Payment Date, and at such other times as
the Trustee  may request in writing,  a list in such form and as of such date as
the Trustee may reasonably  require of the names and addresses of the Holders of
Notes, if any.

                  SECTION 2.07. Transfer and Exchange. (a) Transfer and Exchange
of Global Notes.  Except as provided below,  transfers of the Global Notes shall
be limited to transfers of such Global Notes in whole,  but not in part,  to the
Depositary.  Certificated Notes shall be transferred to all beneficial owners in
exchange  for  their  beneficial  interests  in the  Global  Notes  if  (i)  the
Depositary or Company delivers to the Trustee notice from the Depositary that it
is unwilling or unable to continue to act as Depositary  for the Global Notes or
at any time ceases to be a clearing  agency  registered  under the  Exchange Act
and, in either  case,  a successor  Depositary  is not  appointed by the Company
within 120 days after the date of such notice from the  Depositary;  or (ii) the
Company in its sole  discretion  determines  that the Global Notes (in whole but
not in part) should be exchanged for  Certificated  Notes and delivers a written
notice to such effect to the Trustee.

                  (i) In  connection  with  any  transfer  of a  portion  of the
         beneficial  interests in the Global Notes to beneficial owners pursuant
         to paragraph (a) above,  the  Registrar  shall reflect on its books and
         records the date and a decrease in the principal  amount of such Global
         Notes in an amount  equal to the  principal  amount  of the  beneficial
         interest in such Global Notes to be transferred,  and the Company shall
         execute,  and the Trustee shall  authenticate and deliver,  one or more
         Certificated Notes of like tenor and amount.

                  (ii) In connection  with the transfer of an entire Global Note
         to beneficial  owners pursuant to paragraph (a) above,  the Global Note
         shall be deemed to be


<PAGE>



surrendered to the Trustee for cancellation,  and the Company shall execute, and
the Trustee shall authenticate and deliver,  to each beneficial owner identified
by the Depositary in exchange for its beneficial  interest in the Global Note an
equal  aggregate   principal   amount  of   Certificated   Notes  of  authorized
denominations.

                  (b)  Transfer  and  Exchange of  Beneficial  Interests  in the
Global Notes.  The transfer and exchange of  beneficial  interests in the Global
Notes  shall be  effected  through  the  Depositary,  in  accordance  with  this
Indenture and Applicable Procedures of the Depositary therefor.

                  (c)  Transfer  and  Exchange  of  Certificated   Notes.   When
Certificated  Notes are presented by a Holder to the Registrar with a request to
register the transfer of the Certificated Notes or to exchange such Certificated
Notes for an equal principal  amount of Certificated  Notes of other  authorized
denominations, the Registrar shall register the transfer or make the exchange as
requested  only if the  Certificated  Notes are  presented  or  surrendered  for
registration  of transfer  or exchange  and are  endorsed  or  accompanied  by a
written  instrument  of  transfer in form  satisfactory  to the  Registrar  duly
executed by such Holder or by his attorney,  duly authorized in writing and upon
receipt of such certificates.

                  (d)      Legends.

                  (i) Original  Issue  Discount  Legend.  Each Note shall bear a
         legend in substantially the following form:

         "FOR THE  PURPOSES  OF  SECTIONS  1272,  1273 AND 1275 OF THE  INTERNAL
         REVENUE CODE OF 1986,  AS AMENDED,  THIS  SECURITY IS BEING ISSUED WITH
         ORIGINAL  ISSUE  DISCOUNT;  FOR EACH  $1,000  PRINCIPAL  AMOUNT OF THIS
         SECURITY,  THE  ISSUE  PRICE  IS $[ ], THE  AMOUNT  OF  ORIGINAL  ISSUE
         DISCOUNT IS $[ ]. FOR ADDITIONAL  INFORMATION  REGARDING ORIGINAL ISSUE
         DISCOUNT, PLEASE CONTACT ORION NEWCO SERVICES, 2440 RESEARCH BOULEVARD,
         SUITE 40, ROCKVILLE, MARYLAND, 20850."

                  (ii) Global Note Legend.  Each Global Note shall bear a legend
         in substantially the following form:

         "THIS  NOTE IS HELD BY THE  DEPOSITARY  (AS  DEFINED  IN THE  INDENTURE
         GOVERNING  THIS NOTE) IN  CUSTODY  FOR THE  BENEFIT  OF THE  BENEFICIAL
         OWNERS  HEREOF,  AND  IS  NOT  TRANSFERABLE  TO ANY  PERSON  UNDER  ANY
         CIRCUMSTANCES  EXCEPT  THAT (I) THIS GLOBAL  NOTE MAY BE  EXCHANGED  IN
         WHOLE BUT NOT IN PART  PURSUANT  TO SECTION  2.07(a) OF THE  INDENTURE,
         (II) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR  CANCELLATION
         PURSUANT TO SECTION  2.12 OF THE  INDENTURE  AND (III) THIS GLOBAL NOTE
         MAY BE


<PAGE>



         TRANSFERRED TO  A SUCCESSOR  DEPOSITARY  WITH THE PRIOR WRITTEN CONSENT
         OF ORION NEWCO SERVICES, INC."

                  (iii) Unit Legend.  Each Note issued  prior to the  Separation
         Date shall bear the  following  legend (the "Unit  Legend") on the face
         thereof:

         "THE NOTES EVIDENCED BY THIS  CERTIFICATE ARE INITIALLY  ISSUED AS PART
         OF AN  ISSUANCE  OF UNITS,  EACH OF WHICH  CONSISTS  OF $[ ]  PRINCIPAL
         AMOUNT  OF  THE  NOTES  AND  ONE  WARRANT   (EACH,   A  "WARRANT"   AND
         COLLECTIVELY, THE "WARRANTS") INITIALLY ENTITLING THE HOLDER THEREOF TO
         PURCHASE [ ] SHARES OF COMMON  STOCK,  PAR VALUE  $.01 PER SHARE,  (THE
         "COMMON STOCK")."

                  (e)  General   Provisions   Relating  to  All   Transfers  and
Exchanges.  (i) To permit registrations of transfers and exchanges,  the Company
shall execute and the Trustee shall  authenticate  Global Notes and Certificated
Notes upon the Company's order or at the Registrar's request.

                  (i) No  service  charge  shall  be  made to a  Holder  for any
         registration  of  transfer  or  exchange,  but the  Company may require
         payment  of a sum  sufficient  to cover  any stamp or  transfer  tax or
         similar governmental charge payable in connection therewith (other than
         any such stamp or transfer taxes or similar governmental charge payable
         upon exchange or transfer  pursuant to Sections 2.11,  3.07, 4.11, 4.13
         and 9.04 hereof).

                  (ii) All Global Notes and  Certificated  Notes issued upon any
         registration  of transfer or exchange of Global  Notes or  Certificated
         Notes shall be the valid  obligations  of the Company,  evidencing  the
         same debt, and entitled to the same benefits under this  Indenture,  as
         the  Global  Notes  or  Certificated   Notes   surrendered   upon  such
         registration of transfer or exchange.

                  (iii) The  Company  shall  not be  required  (A) to issue,  to
         register the transfer of or to exchange Notes during a period beginning
         at the opening of business 15 days before the day of any  selection  of
         Notes for redemption  under Section 3.03 hereof and ending at the close
         of business on the day of selection, (B) to register the transfer of or
         to exchange  any Note so selected for  redemption  in whole or in part,
         except the unredeemed portion of any Note being redeemed in part or (C)
         to register the transfer of or to exchange a Note between a record date
         and the next succeeding Interest Payment Date.

                  (iv)  Prior  to due  presentment  for  the  registration  of a
         transfer of any Note,  the Trustee,  any Agent and the Company may deem
         and  treat  the  Person  in whose  name any Note is  registered  as the
         absolute  owner of such Note for the  purpose of  receiving  payment of
         principal of and interest on such Notes and for all other purposes, and
         neither the  Trustee,  any Agent nor the  Company  shall be affected by
         notice to the contrary.


<PAGE>





                  (v)  The  Trustee   shall   authenticate   Global   Notes  and
         Certificated  Notes in accordance  with the  provisions of Section 2.02
         hereof.

                  SECTION 2.08.  Replacement Notes . If a mutilated Certificated
Note is surrendered to the Registrar or the Trustee,  if a mutilated Global Note
is  surrendered  to the Company or the Trustee or if the Company and the Trustee
receive evidence to their satisfaction that any Note has been lost, destroyed or
stolen, the Company shall issue and the Trustee shall authenticate a replacement
Note in such form as the Notes mutilated, lost, destroyed or wrongfully taken if
(i) in the case of a lost,  destroyed  or stolen  Note,  the Holder of such Note
furnishes to the Company,  the Trustee and, in the case of a Certificated  Note,
the Registrar,  evidence reasonably  acceptable to them of the ownership and the
destruction,  loss or theft of such  Note and (ii) an  indemnity  bond  shall be
posted by the Holder requesting replacement,  sufficient in the judgment of each
to protect the Company, the Registrar (in the case of a Certificated Note ), the
Trustee  or any Agent  from any loss that any of them may suffer if such Note is
replaced.  Prior to the issuance of any such replacement Note, the Trustee shall
notify the Company of any request  therefor.  The Company may charge such Holder
for the Company's  out-of-pocket expenses in replacing such Note and the Trustee
may charge the Holder for the Trustee's  expenses in replacing such Note.  Every
replacement  Note shall  constitute an additional  obligation of the Company and
shall  be  entitled  to  all of the  benefits  of  this  Indenture  equally  and
proportionally  with all other Notes issued  hereunder.  The  provisions of this
Section  2.08 are  exclusive  and shall  preclude  (to the extent  permitted  by
applicable law) all other rights and remedies with respect to the replacement of
mutilated, lost, destroyed or stolen Notes.

                  SECTION 2.09. Outstanding Notes . The Notes outstanding at any
time are all Notes that have been  authenticated  by the Trustee  except for (a)
those  cancelled by it, (b) those delivered to it for  cancellation,  (c) to the
extent set forth in  Sections  8.01 and 8.02,  on or after the date on which the
conditions  set forth in Section 8.01 or 8.02 have been  satisfied,  those Notes
theretofore  authenticated  and delivered by the Trustee hereunder and (d) those
described in this Section 2.09 as not  outstanding.  Subject to Section  2.10, a
Note  does  not  cease  to be  outstanding  because  the  Company  or one of its
Affiliates holds the Note.

                  If a Note is replaced  pursuant to Section  2.08, it ceases to
be outstanding  unless the Trustee  receives proof  satisfactory  to it that the
replaced  Note is held by a bona fide  purchaser  in whose  hands such Note is a
legal, valid and binding obligation of the Company.

                  If the  principal  amount of any Note is considered to be paid
under Section 4.01, it ceases to be outstanding and interest thereon shall cease
to accrue.

                  If the Paying  Agent holds,  in its  capacity as such,  on the
Stated Maturity of a Note, on any Redemption Date or on any Payment Date,  money
sufficient to pay all accrued interest and Liquidated Damages and principal with
respect to such Notes  payable on that date and is not  prohibited  from  paying
such money to the Holders thereof pursuant to the terms of this Indenture,  then
on and after that date such Notes cease to be  outstanding  and interest on them
ceases to accrue.



<PAGE>




                  SECTION  2.10.  Treasury  Notes . In  determining  whether the
Holders  of the  required  principal  amount  of  Notes  have  concurred  in any
direction,  waiver or consent or any amendment,  modification or other change to
this Indenture,  Notes owned by the Company or an Affiliate of the Company shall
be disregarded as though they were not outstanding, except that for the purposes
of  determining  whether the Trustee  shall be  protected in relying on any such
direction,  waiver or consent or any amendment,  modification or other change to
this Indenture, only Notes that the Trustee actually knows are so owned shall be
so disregarded.

                  SECTION 2.11.  Temporary  Notes . Until  definitive  Notes are
prepared and ready for delivery,  the Company may prepare and the Trustee shall,
upon receipt of a Company Order,  authenticate  temporary Notes. Temporary Notes
shall be  substantially  in the form of definitive Notes but may have variations
that the Company considers appropriate for temporary Notes. Without unreasonable
delay, the Company shall prepare and the Trustee shall  authenticate  definitive
Notes in exchange for temporary  Notes.  Until such  exchange,  temporary  Notes
shall be entitled to the same rights,  benefits  and  privileges  as  definitive
Notes.

                  SECTION  2.12.   Cancellation  .  All  Notes  surrendered  for
payment, redemption,  registration of transfer or exchange shall, if surrendered
to any Person other than the  Trustee,  be delivered to the Trustee and shall be
promptly cancelled by it. The Company may at any time deliver to the Trustee for
cancellation any Notes previously  authenticated  and delivered  hereunder which
the Company may have acquired in any manner  whatsoever,  and may deliver to the
Trustee (or to any other Person for  delivery to the  Trustee) for  cancellation
any Notes  previously  authenticated  hereunder which the Company has not issued
and sold, and all Notes so delivered shall be promptly cancelled by the Trustee.
If the Company  shall so acquire  any of the Notes,  however,  such  acquisition
shall  not  operate  as  a  redemption  or  satisfaction  of  the   indebtedness
represented  by such  Notes  unless  and until the same are  surrendered  to the
Trustee  for  cancellation.  No Notes  shall be  authenticated  in lieu of or in
exchange for any Notes  cancelled as provided in this  Section  2.12,  except as
expressly  permitted by this Indenture.  All cancelled Notes held by the Trustee
shall be disposed of by the Trustee in accordance with its customary  procedures
and  certification of their disposal  delivered to the Company unless by Company
Order the Company shall direct that cancelled Notes be returned to it.

                  SECTION 2.13. Defaulted Interest. If the Company defaults on a
payment of interest on the Notes,  it shall pay the defaulted  interest plus (to
the extent permitted by law) any interest  payable on the defaulted  interest in
accordance  with  the  terms  hereof,  to (a) the  Persons  who are  Holders  of
Certificated  Notes,  if any, on a subsequent  special  record date,  which date
shall  be at  least  five  Business  Days  prior  to the  payment  date for such
defaulted interest,  and (b) if any Global Notes are outstanding on such payment
date, to the Holder of the Global Notes on such payment date.  The Company shall
fix  such  special  record  date  and  payment  date  in  a  manner   reasonably
satisfactory  to the Trustee.  At least 15 days before such special record date,
the Company shall mail to each Holder of Certificated  Notes, if any, and if the
Global Notes are still outstanding,  to the Holder thereof and the Depositary, a
notice that states the special  record date,  the payment date and the amount of
defaulted interest and interest payable on such defaulted interest to be paid.


<PAGE>





                  SECTION  2.14.  CUSIP,  CINS or ISIN  Number.  The  Company in
issuing the Notes may use a "CUSIP,"  "CINS" or "ISIN"  number,  and if so, such
CUSIP,  CINS  or ISIN  number  shall  be  included  in  notices  of  redemption,
repurchase or exchange as a convenience to Holders, provided,  however, that any
such notice may state that no  representation  is made as to the  correctness or
accuracy  of the  CUSIP,  CINS or ISIN  number  printed  in the notice or on the
Notes, and that reliance may be placed only on the other identification  numbers
printed on the Notes; and provided,  further that failure to use CUSIP,  CINS or
ISIN  numbers in any notice of  redemption,  repurchase  or  exchange  shall not
affect the validity or  sufficiency  of such notice.  The Company will  promptly
notify the Trustee of any change in the CUSIP, CINS or ISIN number.

                  SECTION  2.15.  Deposit of Moneys . Prior to 12:00  noon,  New
York City time,  on each Interest  Payment  Date, at the Stated  Maturity of the
Notes,  on each  Redemption  Date,  on each Payment Date and on the Business Day
immediately  following any  acceleration  of the Notes pursuant to Section 6.02,
the Company shall deposit with the Paying Agent in immediately  available  funds
money (in United States dollars)  sufficient to make cash payments,  if any, due
on such Interest Payment Date, Stated Maturity, Redemption Date, Payment Date or
Business  Day, as the case may be, in a timely  manner which permits the Trustee
to remit payment to the Holders on such Interest Payment Date,  Stated Maturity,
Redemption Date, Payment Date or Business Day, as the case may be.



                                  ARTICLE THREE
                                   REDEMPTION

                  SECTION  3.01.  Right  of  Redemption  .  The  Notes  will  be
redeemable,  at the Company's  option,  in whole or in part, at any time or from
time to time, on or after [ ], 2002 and prior to maturity, upon not less than 30
nor more than 60 days' prior notice  mailed by first class mail to each Holders'
last address as it appears in the Note  Register,  at the  following  Redemption
Prices (expressed in percentages of principal amount at maturity),  plus accrued
and unpaid  interest,  if any, to the  Redemption  Date (subject to the right of
Holders of record on the relevant Regular Record Date that is on or prior to the
Redemption  Date to  receive  interest  due on an  Interest  Payment  Date),  if
redeemed  during  the  12-month  period  commencing  [ ], of the years set forth
below:


          Year                          Redemption Price 
          2002                                   [_____]%
          2003                                   [_____]%
          2004 and thereafter                    100.000%
          




<PAGE>

                  SECTION  3.02.  Notices to Trustee . If the Company  elects to
redeem Notes pursuant to Section 3.01, it shall notify the Trustee in writing of
(i) the clause of the Indenture  pursuant to which the  redemption  shall occur,
(ii) the Redemption Date, (iii) the principal amount at Stated Maturity of Notes
to be redeemed plus interest accrued thereon, if any, to the Redemption Date and
(iv) the Redemption Price.

                  The  Company  shall  give  each  notice  provided  for in this
Section 3.02 in an  Officers'  Certificate  at least 15 days before  mailing the
notice to Holders referred to in Section 3.01.

                  SECTION 3.03.  Selection of Notes to Be Redeemed . In the case
of any partial redemption, selection of the Notes for redemption will be made by
the  Trustee in  compliance  with the  requirements  of the  principal  national
securities exchange,  if any, on which the Notes are listed or, if the Notes are
not listed on a national securities exchange,  on a pro rata basis, by lot or by
such other  method as the Trustee in its sole  discretion  shall deem to be fair
and appropriate; provided that no Note of $1,000 in principal amount at maturity
or less shall be redeemed  in part.  If any Note is to be redeemed in part only,
the notice of  redemption  relating  to such Note shall state the portion of the
principal  amount at maturity  thereof to be  redeemed.  A new Note in principal
amount at maturity equal to the unredeemed portion thereof will be issued in the
name of the Holder thereof upon cancellation of the original Note.


                  SECTION  3.04.  Notice of  Redemption  . With  respect  to any
redemption of Notes pursuant to Section 3.01, at least 30 days but not more than
60 days before a Redemption  Date, the Company shall mail a notice of redemption
by first  class  mail to each  Holder  whose  Notes are to be  redeemed  at such
Holder's registered address.

                  The notice  shall  identify the Notes to be redeemed and shall
state:

                  (a)      the Redemption Date;

                  (b)      the Redemption Price;

                  (c)      the name and address of the Paying Agent;

                  (d) that Notes called for  redemption  must be  surrendered to
         the Paying Agent in order to collect the Redemption Price;

                  (e) the  paragraph  of the Notes  and/or  the  Section of this
         Indenture  pursuant to which the Notes called for  redemption are being
         redeemed;

                  (f) that, unless the Company defaults in making the redemption
         payment,  interest on Notes called for  redemption  ceases to accrue on
         and  after  the  Redemption  Date and the only  remaining  right of the
         Holders is to receive payment of the


<PAGE>



Redemption  Price plus accrued interest to the Redemption Date upon surrender of
the Notes to the Paying Agent;

                  (g) that, if any Note is being  redeemed in part,  the portion
         of the  principal  amount  (equal to $1,000 in principal  amount or any
         integral multiple thereof) of such Note to be redeemed and that, on and
         after the Redemption  Date,  upon surrender of such Note, a new Note or
         Notes in principal amount equal to the unredeemed  portion thereof will
         be reissued; and

                  (h) that,  if any Note contains a CUSIP,  CINS,  ISIN or other
         identification number as provided in Section 2.14, no representation is
         being  made as to the  correctness  of the CUSIP,  CINS,  ISIN or other
         identification number either as printed on the Notes or as contained in
         the notice of  redemption  and that  reliance may be placed only on the
         other identification numbers printed on the Notes.

                  At the Company's  request  contained in a Company Order (which
request may be revoked by the Company at any time prior to the time at which the
Trustee  shall have given such  notice to the  Holders),  made to the Trustee at
least 15 days before mailing the notice to Holders  referred to in Section 3.01,
the Trustee  shall give such notice of redemption in the name and at the expense
of the Company.  If, however,  the Company gives such notice to the Holders, the
Company  shall  concurrently  deliver to the  Trustee an  Officers'  Certificate
stating that such notice has been given. Notice of redemption shall be deemed to
be given when  mailed,  whether or not the Holder  receives  the notice.  In any
event, failure to give such notice, or any defect therein,  shall not affect the
validity of the  proceedings for the redemption of Notes held by Holders to whom
such notice was properly given.

                  SECTION 3.05. Deposit of Redemption Price . On or prior to any
Redemption  Date,  the Company  shall  deposit with the Paying Agent (or, if the
Company is acting as its own Paying Agent,  shall segregate and hold in trust as
provided in section 2.05) money  sufficient to pay the Redemption  Price of, and
accrued and unpaid  interest on all Notes to be redeemed on that date other than
Notes or  portions  thereof  called for  redemption  on that date that have been
delivered by the Company to the Trustee for cancellation.

                  SECTION  3.06.  Payment of Notes  Called for  Redemption  . If
notice of redemption has been given to Holders in the manner provided above, the
Notes or portion of Notes  specified in such notice to be redeemed  shall become
irrevocably  due and  payable on the  Redemption  Date at the  Redemption  Price
stated therein,  together with accrued  interest to such Redemption Date, and on
and after any such  Redemption  Date  (unless the Company  shall  default in the
payment  of Notes to be  redeemed  on such date at the  Redemption  Price,  plus
accrued  interest to the  Redemption  Date, in which case the  principal,  until
paid, shall bear interest from the Redemption Date at the rate prescribed in the
Notes),  such Notes shall cease to accrue  interest.  Upon surrender of any Note
for  redemption in accordance  with a notice of  redemption,  such Note shall be
paid and redeemed by the Company at the Redemption  Price, plus accrued interest
to the  Redemption  Date,  provided that  installments  of interest whose Stated
Maturity is


<PAGE>



 on or prior to the Redemption  Date shall be payable to the Holders  registered
as such at the close of business on the relevant Regular Record Date.

                  SECTION 3.07.  Notes Redeemed in Part . Upon  cancellation  of
any Note that is redeemed in part, the Company shall issue and the Trustee shall
authenticate  and deliver to the Holder a new Note equal in principal  amount to
the unredeemed portion of such surrendered Note.


                                  ARTICLE FOUR
                                    COVENANTS

                  SECTION  4.01.  Payment of Notes . The  Company  shall pay the
principal of, premium, if any, and interest on the Notes on the dates and in the
manner  provided in the Notes and this  Indenture.  An installment of principal,
premium or interest  shall be considered  paid on the date due if the Trustee or
Paying  Agent  (other than the Company,  a  Subsidiary  of the  Company,  or any
Affiliate of any of them) holds as of 10:00AM New York City time on the due date
money deposited by the Company in immediately available funds and designated for
and sufficient to pay the installment.

                  SECTION  4.02.  Issuances  of  Guarantees  by  New  Restricted
Subsidiaries.  The Company  will  provide to the  Trustee,  on the date that any
Person  becomes  a  Restricted  Subsidiary,  a  supplemental  indenture  to this
Indenture, executed by such new Restricted Subsidiary,  providing for a full and
unconditional  guarantee on a senior basis by such new Restricted  Subsidiary of
the Company's obligations under the Notes and this Indenture;  provided that, in
the case of any new Restricted  Subsidiary that becomes a Restricted  Subsidiary
through the acquisition of a majority of its voting Capital Stock by the Company
or any other  Restricted  Subsidiary,  such guarantee may be subordinated to the
extent required by the obligations of such new Restricted Subsidiary existing on
the date of such  acquisition  that were not incurred in  contemplation  of such
acquisition.

                  SECTION  4.03.  Limitation on  Indebtedness  . (a) The Company
will not, and will not permit any of its Restricted  Subsidiaries  to, Incur any
Indebtedness  (other  than the Notes and  Indebtedness  existing  on the Closing
Date);  provided that the Company may Incur Indebtedness if, after giving effect
to the Incurrence of such  Indebtedness  and the receipt and  application of the
proceeds therefrom,  the Consolidated  Leverage Ratio would be greater than zero
and less than 6 to 1.

                  Notwithstanding the foregoing,  the Company and any Restricted
Subsidiary (except as specified below) may Incur each and all of the following:

                  (i) Indebtedness  outstanding at any time that is (A) Incurred
         to finance the purchase, construction,  launch, insurance for and other
         costs  with  respect  to  Orion 2 and  Orion  3 or (B) in an  aggregate
         principal  amount not to exceed  (1) until  Orion 2 or Orion 3 has been
         successfully  delivered in orbit,  $50 million,  (2) after the first of
         Orion 2 or


<PAGE>



Orion 3 has been successfully delivered in orbit, $100 million and (3) after the
second of Orion 2 or Orion 3 has been  successfully  delivered  in  orbit,  $150
million, in each case under this clause (i)(B);

                  (ii) Indebtedness owed (A) to the Company or (B) to any of its
         Restricted  Subsidiaries;  provided that any event which results in any
         such Restricted Subsidiary ceasing to be a Restricted Subsidiary or any
         subsequent  transfer of such Indebtedness (other than to the Company or
         another  Restricted  Subsidiary)  shall be  deemed,  in each  case,  to
         constitute  an Incurrence  of such  Indebtedness  not permitted by this
         clause (ii);

                  (iii) Indebtedness issued in exchange for, or the net proceeds
         of  which  are  used  to   refinance   or  refund,   then   outstanding
         Indebtedness,  other than  Indebtedness  Incurred  under clause (i)(B),
         (ii),  (iv),  (vi) or (viii) of this  paragraph,  and any  refinancings
         thereof in an amount not to exceed the amount so refinanced or refunded
         (plus premiums,  accrued  interest,  fees and expenses);  provided that
         Indebtedness  the proceeds of which are used to refinance or refund the
         Notes,  the Note Guarantee or Indebtedness  that is pari passu with, or
         subordinated  in right of payment to, the Notes shall only be permitted
         under this clause (iii) if (A) in case the Notes or the Note  Guarantee
         are  refinanced  in part or the  Indebtedness  to be refinanced is pari
         passu with the Notes or the Note Guarantee,  such new Indebtedness,  by
         its terms or by the terms of any  agreement or  instrument  pursuant to
         which such new  Indebtedness  is  outstanding,  is expressly  made pari
         passu with, or subordinate in right of payment to, the remaining  Notes
         or the Note Guarantee, as the case may be, (B) in case the Indebtedness
         to be  refinanced is  subordinated  in right of payment to the Notes or
         the Note Guarantee, such new Indebtedness, by its terms or by the terms
         of any agreement or instrument  pursuant to which such new Indebtedness
         is issued or remains  outstanding,  is expressly  made  subordinate  in
         right of  payment  to the Notes or the Note  Guarantee  at least to the
         extent that the  Indebtedness  to be refinanced is  subordinated to the
         Notes or the  Note  Guarantee,  as the  case  may be,  and (C) such new
         Indebtedness,  determined  as of the  date of  Incurrence  of such  new
         Indebtedness,  does not  mature  prior to the  Stated  Maturity  of the
         Indebtedness to be refinanced or refunded, and the Average Life of such
         new Indebtedness is at least equal to the remaining Average Life of the
         Indebtedness to be refinanced or refunded;

                  (iv)  Indebtedness  (A) in respect of  performance,  surety or
         appeal  bonds  provided in the ordinary  course of business,  (B) under
         Currency  Agreements and Interest Rate  Agreements;  provided that such
         agreements  (a) are  designed  solely to  protect  the  Company  or its
         Subsidiaries against fluctuations in foreign currency exchange rates or
         interest rates and (b) do not increase the  Indebtedness of the obligor
         outstanding  at any time  other  than as a result  of  fluctuations  in
         foreign currency exchange rates or interest rates or by reason of fees,
         indemnities and  compensation  payable  thereunder and (C) arising from
         agreements providing for indemnification,  adjustment of purchase price
         or similar obligations, or from Guarantees or letters of credit, surety
         bonds or performance  bonds securing any  obligations of the Company or
         any of its Restricted Subsidiaries pursuant to such agreements,  in any
         case Incurred in connection with the disposition of


<PAGE>



 any  business,  assets or  Restricted  Subsidiary  of the  Company  (other than
Guarantees of Indebtedness  Incurred by any Person  acquiring all or any portion
of such business, assets or Restricted Subsidiary of the Company for the purpose
of financing such  acquisition),  in a principal  amount not to exceed the gross
proceeds  actually  received  by the  Company or any  Restricted  Subsidiary  in
connection with such disposition;

                  (v)  Indebtedness  of the  Company,  to  the  extent  the  net
         proceeds thereof are promptly (A) used to purchase Notes tendered in an
         Offer to  Purchase  made as a  result  of a Change  in  Control  or (B)
         deposited  to defease the Notes as  described  in Section  8.02 of this
         Indenture;  (vi) Guarantees of the Notes and Guarantees of Indebtedness
         of the Company by any Restricted  Subsidiary  provided the Guarantee of
         such  Indebtedness  is permitted by and made in accordance with Section
         4.07 of this Indenture;

                  (vii) Indebtedness Incurred to finance the cost (including the
         cost of design, development, construction,  installation,  improvement,
         transportation  or  integration)  of equipment  (other than Orion 2 and
         Orion  3)  or  inventory  acquired  by  the  Company  or  a  Restricted
         Subsidiary after the Closing Date;

                  (viii)  Indebtedness of the Company not to exceed,  at any one
         time  outstanding,  two times  the Net Cash  Proceeds  received  by the
         Company  after  the  Closing  Date  from the  issuance  and sale of its
         Capital Stock (other than Disqualified Stock) to a Person that is not a
         Subsidiary of the Company (less the amount of such proceeds  applied as
         provided in clause  (C)(2) of the first  paragraph  or clause  (iii) or
         (iv)of  the  second  paragraph  of  Section  4.04 of  this  Indenture);
         provided  that such  Indebtedness  does not mature  prior to the Stated
         Maturity  of the Notes and has an Average  Life  longer than the Notes;
         and

                  (ix)     Redemption Indebtedness.

         (b) Notwithstanding  any other provision of this Section covenant,  the
maximum amount of Indebtedness  that the Company or a Restricted  Subsidiary may
incur  pursuant to this Section  4.03 shall not be deemed to be  exceeded,  with
respect  to  any  outstanding   Indebtedness,   due  solely  to  the  result  of
fluctuations in the exchange rates of currencies.

         (c) For purposes of determining  any particular  amount of Indebtedness
under this Section 4.03, (1)  Guarantees,  Liens or obligations  with respect to
letters  of  credit   supporting   Indebtedness   otherwise   included   in  the
determination of such particular  amount shall not be included and (2) any Liens
granted pursuant to the equal and ratable provisions referred to in Section 4.09
of this  Indenture  shall  not be  treated  as  Indebtedness.  For  purposes  of
determining  compliance  with this  Section  4.03,  in the event that an item of
Indebtedness  meets the  criteria of more than one of the types of  Indebtedness
described in the above  clauses,  the  Company,  in its sole  discretion,  shall
classify  such item of  Indebtedness  and only be required to include the amount
and type of such Indebtedness in one of such clauses.

         (d) In the event that the Company or any  Restricted  Subsidiary  shall
repay any  Indebtedness  (other  than the Notes)  pursuant  to clause  (i)(A) of
Section 4.11 of this Indenture,


<PAGE>



 the aggregate  amount of  Indebtedness  which may  otherwise be Incurred  under
clauses  (i)(B) and  (viii) of the second  paragraph  of  paragraph  (a) of this
Section 4.03 shall be reduced by the amount of such repayment. The Company shall
designate how much of such reduction shall be applied to each such clause.

                  SECTION 4.04.  Limitation on Restricted Payments . The Company
will not, and will not permit any Restricted Subsidiary, directly or indirectly,
to (i) declare or pay any dividend or make any  distribution  on or with respect
to its Capital Stock (other than (x) dividends or  distributions  payable solely
in shares of its Capital  Stock (other than  Disqualified  Stock) or in options,
warrants or other  rights to acquire  shares of such  Capital  Stock and (y) pro
rata dividends or distributions on Common Stock of Restricted  Subsidiaries held
by minority  stockholders,  provided that such dividends do not in the aggregate
exceed  the   minority   stockholders'   pro  rata  share  of  such   Restricted
Subsidiaries'  net  income  from the first day of the fiscal  quarter  beginning
immediately  following  the Closing Date) held by Persons other than the Company
or any  of  its  Restricted  Subsidiaries,  (ii)  purchase,  redeem,  retire  or
otherwise  acquire  for value any shares of Capital  Stock of the  Company,  any
Guarantor or an Unrestricted  Subsidiary  (including options,  warrants or other
rights to acquire such shares of Capital  Stock) held by Persons  other than the
Company and its Wholly Owned Subsidiaries,  (iii) make any voluntary or optional
principal payment, or voluntary or optional redemption,  repurchase, defeasance,
or other  acquisition or retirement for value,  of  Indebtedness  of the Company
that is  subordinated  in right of payment to the Notes or of any Guarantor that
is subordinated  to the Note Guarantee  (other than, in each case, the purchase,
repurchase or the  acquisition of  Indebtedness  in anticipation of satisfying a
sinking fund obligation,  principal  installment or final maturity,  in any case
due within  one year of the date of  acquisition)  or (iv) make any  Investment,
other than a Permitted  Investment,  in any Person  (such  payments or any other
actions  described  in clauses (i) through (iv) being  collectively  "Restricted
Payments")  if,  at the time of,  and  after  giving  effect  to,  the  proposed
Restricted Payment: (A) a Default or Event of Default shall have occurred and be
continuing,  (B) except with respect to Investments  and dividends on the Common
Stock  of any  Guarantor,  the  Company  could  not  Incur  at  least  $1.00  of
Indebtedness  under the first  paragraph  of Section  4.03 or (C) the  aggregate
amount of all  Restricted  Payments  (the amount,  if other than in cash,  to be
determined in good faith by the Board of Directors, whose determination shall be
conclusive  and  evidenced  by a Board  Resolution)  made after the Closing Date
shall  exceed  the  sum of  (1)  50% of the  aggregate  amount  of the  Adjusted
Consolidated Net Income (or, if the Adjusted  Consolidated Net Income is a loss,
minus 100% of the amount of such loss) (determined by excluding income resulting
from  transfers  of assets  by the  Company  or a  Restricted  Subsidiary  to an
Unrestricted  Subsidiary) accrued on a cumulative basis during the period (taken
as one  accounting  period)  beginning  on the first day of the  fiscal  quarter
immediately  following  the Closing  Date and ending on the last day of the last
fiscal quarter  preceding the Transaction Date for which reports have been filed
pursuant to plus (2) the aggregate Net Cash Proceeds  received by the Company or
any Guarantor after the Closing Date from the issuance and sale permitted by the
Indentures of its Capital Stock (other than Disqualified  Stock) to a Person who
is not a  Subsidiary  of the Company or any  Guarantor or from the issuance to a
Person who is not a Subsidiary  of the Company or any  Guarantor of any options,
warrants or other rights to acquire  Capital Stock of the Company (in each case,
exclusive of any Disqualified Stock or any options, warrants or


<PAGE>



 other rights that are  redeemable at the option of the holder,  or are required
to be redeemed,  prior to the Stated Maturity of the Notes), in each case except
to the extent such Net Cash Proceeds are used to Incur Indebtedness  pursuant to
clause (viii) of the second  paragraph  under  Section 4.03,  plus (3) an amount
equal to the net reduction in  Investments  (other than  reductions in Permitted
Investments) in any Person  resulting from payments of interest on Indebtedness,
dividends,  repayments of loans or advances,  or other  transfers of assets,  in
each  case to the  Company  or any  Restricted  Subsidiary  or from the Net Cash
Proceeds  from the sale of any such  Investment  (except,  in each case,  to the
extent any such payment or proceeds are included in the  calculation of Adjusted
Consolidated Net Income), or from redesignations of Unrestricted Subsidiaries as
Restricted  Subsidiaries  (valued in each case as provided in the  definition of
"Investments"),  not  to  exceed,  in  each  case,  the  amount  of  Investments
previously  made by the Company or any  Restricted  Subsidiary in such Person or
Unrestricted Subsidiary.

                  The foregoing provision shall not be violated by reason of:

                  (i) the payment of any dividend  within 60 days after the date
         of declaration  thereof if, at said date of  declaration,  such payment
         would comply with the foregoing paragraph;

                  (ii)  the   redemption,   repurchase,   defeasance   or  other
         acquisition   or  retirement   for  value  of   Indebtedness   that  is
         subordinated  in right of payment to the Notes  including  premium,  if
         any,  and  accrued and unpaid  interest,  with the  proceeds  of, or in
         exchange for,  Indebtedness  Incurred  under clause (iii) of the second
         paragraph of part (a) of Section 4.03;

                  (iii)  the  repurchase,  redemption  or other  acquisition  of
         Capital  Stock of the Company (or options,  warrants or other rights to
         acquire such Capital  Stock) in exchange for, or out of the proceeds of
         a substantially  concurrent offering of, shares of Capital Stock (other
         than Disqualified Stock) of the Company;

                  (iv) the making of any  principal  payment or the  repurchase,
         redemption,  retirement,  defeasance or other  acquisition for value of
         Indebtedness  of the Company which is  subordinated in right of payment
         to  the  Notes  in  exchange   for,  or  out  of  the  proceeds  of,  a
         substantially  concurrent  offering of,  shares of the Capital Stock of
         the Company (other than Disqualified Stock);

                  (v)  payments or  distributions,  to  dissenting  stockholders
         pursuant  to  applicable  law,  pursuant  to or in  connection  with  a
         consolidation,  merger or  transfer of assets  that  complies  with the
         provisions of the Indentures applicable to mergers,  consolidations and
         transfers of all or substantially all of the property and assets of the
         Company;

                  (vi)  the  repurchase,  redemption  or  other  acquisition  of
         outstanding  shares of Series A  Preferred  Stock or Series B Preferred
         Stock,  which shares either (A) were outstanding on the Closing Date or
         (B) are shares of Series A Preferred  Stock which were issued  pursuant
         to the exercise of options that were outstanding on the Closing


<PAGE>



         Date,  in  exchange  for,   or out of the  proceeds  of, an issuance of
         Indebtedness  Incurred  under  clause (ix)  of the second  paragraph of
         part (a) of Section 4.03; or

                  (vii)  Investments to the extent the amount invested  consists
         solely of Net Cash Proceeds  received by the Company or any  Guarantor,
         within six months of the making of such  Investment,  from the issuance
         and sale  permitted by the  Indentures of its Capital Stock (other than
         Disqualified  Stock) to a Person who is not a Subsidiary of the Company
         or any Guarantor;

                  (viii)  Investments,  the sum of  which  does  not  exceed  $5
         million at any one time outstanding;

(ix) cash  payments,  not to  exceed  $3  million,  in lieu of the  issuance  of
fractional  shares of Capital  Stock of the  Company  upon the  exercise  of the
Warrants or any other  warrants to buy, or upon the conversion of any securities
convertible into, Capital Stock of the Company; and

                  (x) a  one-time  cash  payment  of up to $3.0  million  to the
         holders of the Junior Subordinated Convertible Debentures in connection
         with the disposition of the Junior Subordinated  Convertible Debentures
         in an  underwritten  public  offering  pursuant to Section  11.4 of the
         Debenture Purchase Agreement;

provided that,  except in the case of clauses (i) and (iii), no Default or Event
of Default shall have  occurred and be  continuing or occur as a consequence  of
the actions or payments set forth therein.

                  Each Restricted  Payment  permitted  pursuant to the preceding
paragraph (other than the Restricted  Payment referred to in clause (ii) thereof
and an exchange of Capital Stock for Capital Stock or  Indebtedness  referred to
in clause (iii) or (iv)  thereof) and the Net Cash Proceeds from any issuance of
Capital  Stock  referred  to in  clauses  (iii) and (iv)  shall be  included  in
calculating  whether the conditions of clause (C) of the first paragraph of this
Section 4.04 have been met with respect to any subsequent  Restricted  Payments.
In the event the  proceeds of an  issuance  of Capital  Stock of the Company are
used for the  redemption,  repurchase  or other  acquisition  of the  Notes,  or
Indebtedness  that is pari passu with the Notes,  then the Net Cash  Proceeds of
such  issuance  shall be included in clause (C) of the first  paragraph  of this
Section 4.04 only to the extent such proceeds are not,  within six months,  used
for such  redemption,  repurchase  or other  acquisition  of  Indebtedness.  Any
Restricted  Payments  made  other  than in cash  shall be valued at fair  market
value. The amount of any Investment "outstanding" at any time shall be deemed to
be equal to the amount of such  Investment on the date made,  less the return of
capital to the  Company and its  Restricted  Subsidiaries  with  respect to such
Investment (up to the amount of such Investment on the date made).

                  SECTION  4.05.   Limitation  on  Dividend  and  Other  Payment
Restrictions Affecting Restricted  Subsidiaries . The Company will not, and will
not permit any Restricted  Subsidiary to, create or otherwise cause or suffer to
exist or become effective any consensual


<PAGE>



 encumbrance  or  restriction  of any  kind  on the  ability  of any  Restricted
Subsidiary  to (i) pay  dividends or make any other  distributions  permitted by
applicable law on any Capital Stock of such Restricted  Subsidiary  owned by the
Company or any other Restricted  Subsidiary,  (ii) pay any Indebtedness  owed to
the Company or any other Restricted Subsidiary,  (iii) make loans or advances to
the  Company or any other  Restricted  Subsidiary  or (iv)  transfer  any of its
property or assets to the Company or any other Restricted Subsidiary.

                  The foregoing  provisions  shall not restrict any encumbrances
or restrictions:

                  (i)  existing on the  Closing  Date in this  Indenture  or any
         other  agreements  in effect on the Closing Date,  and any  extensions,
         refinancings,  renewals or  replacements of such  agreements;  provided
         that  the   encumbrances  and  restrictions  in  any  such  extensions,
         refinancings,  renewals or  replacements  are no less  favorable in any
         material respect to the Holders than those encumbrances or restrictions
         that  are then in  effect  and that  are  being  extended,  refinanced,
         renewed or replaced;

                  (ii)     existing under or by reason of applicable law;

                  (iii)  existing  with respect to any Person or the property or
         assets  of  such  Person  acquired  by the  Company  or any  Restricted
         Subsidiary  and  existing  at  the  time  of  such  acquisition,  which
         encumbrances  or  restrictions  are not applicable to any Person or the
         property or assets of any Person other than such Person or the property
         or assets of such Person so acquired;

                  (iv) in the case of clause (iv) of the first paragraph of this
         Section 4.05, (A) that restrict in a customary  manner the  subletting,
         assignment  or  transfer  of any  property  or  asset  that is a lease,
         license,  conveyance  or  contract or similar  property  or asset,  (B)
         existing by virtue of any transfer of, agreement to transfer, option or
         right  with  respect  to,  or Lien on,  any  property  or assets of the
         Company or any Restricted  Subsidiary not otherwise  prohibited by this
         Indenture  or (C)  arising  or  agreed  to in the  ordinary  course  of
         business,   not  relating  to  any  Indebtedness,   and  that  do  not,
         individually or in the aggregate, detract from the value of property or
         assets  of the  Company  or any  Restricted  Subsidiary  in any  manner
         material to the Company or any Restricted Subsidiary; or

                  (v)  with  respect  to a  Restricted  Subsidiary  and  imposed
         pursuant to an  agreement  that has been  entered  into for the sale or
         disposition  of all or  substantially  all of the Capital  Stock of, or
         property and assets of, such Restricted  Subsidiary.  Nothing contained
         in this  Section  4.05 shall  prevent  the  Company  or any  Restricted
         Subsidiary from (1) creating, incurring, assuming or suffering to exist
         any Liens  otherwise  permitted in Section 4.09 or (2)  restricting the
         sale or other  disposition  of property or assets of the Company or any
         of its Restricted  Subsidiaries that secure Indebtedness of the Company
         or any of its Restricted Subsidiaries.


<PAGE>





                  SECTION  4.06.  Limitation on the Issuance of Capital Stock of
Restricted  Subsidiaries  . The Company  will not sell,  and will not permit any
Restricted Subsidiary,  directly or indirectly,  to issue or sell, any shares of
Capital Stock of a Restricted Subsidiary  (including options,  warrants or other
rights to purchase shares of such Capital Stock) except:

                  (i) to the Company or a Wholly Owned Restricted Subsidiary;

                  (ii)  issuances of  director's  qualifying  shares or sales to
         foreign  nationals  of shares of Capital  Stock of  foreign  Restricted
         Subsidiaries, to the extent required by applicable law;

                  (iii) if,  immediately after giving effect to such issuance or
         sale,  such  Restricted   Subsidiary  would  no  longer   constitute  a
         Restricted Subsidiary, provided any Investment in such Person remaining
         after giving effect to such issuance or sale would have been  permitted
         to be made under  Section 4.04, if made on the date of such issuance or
         sale; and

                  (iv)  issuances  or sales of  Common  Stock of any  Restricted
         Subsidiary,  the Net  Cash  Proceeds  of  which  are  promptly  applied
         pursuant  to  clause  (A) or (B) of  Section  4.11 of  this  Indenture;
         provided that at no time may a Restricted Subsidiary,  the Common Stock
         of which has been issued or sold  pursuant to this clause (iv),  be the
         owner of a satellite.

                  SECTION  4.07.   Limitation  on  Issuances  of  Guarantees  by
Restricted Subsidiaries . The Company will not permit any Restricted Subsidiary,
directly or indirectly,  to Guarantee any  Indebtedness  of the Company which is
pari passu  with or  subordinate  in right of payment to the Notes  ("Guaranteed
Indebtedness"),  unless such  Restricted  Subsidiary  waives and will not in any
manner  whatsoever  claim or take the  benefit  or  advantage  of, any rights of
reimbursement,  indemnity or subrogation or any other rights against the Company
or any other Restricted Subsidiary as a result of any payment by such Restricted
Subsidiary  under its Subsidiary  Guarantee;  provided that this paragraph shall
not be applicable to any Guarantee of any Restricted  Subsidiary that existed at
the time such Person  became a  Restricted  Subsidiary  and was not  Incurred in
connection  with,  or in  contemplation  of, such Person  becoming a  Restricted
Subsidiary.  If the Guaranteed  Indebtedness is (A) pari passu with the Notes or
the Note Guarantee,  then the Guarantee of such Guaranteed Indebtedness shall be
pari  passu  with,  or  subordinated   to,  the  Subsidiary   Guarantee  or  (B)
subordinated  to the Notes or the Note  Guarantee,  then the  Guarantee  of such
Guaranteed  Indebtedness  shall be subordinated  to the Subsidiary  Guarantee at
least to the extent that the  Guaranteed  Indebtedness  is  subordinated  to the
Notes or the Note Guarantee, as the case may be.

                  SECTION 4.08. Limitation on Transactions with Shareholders and
Affiliates . The Company will not, and will not permit any Restricted Subsidiary
to,  directly  or  indirectly,  enter  into,  renew or  extend  any  transaction
(including,  without  limitation,  the  purchase,  sale,  lease or  exchange  of
property or assets,  or the  rendering of any  service)  with any holder (or any
Affiliate  of such  holder) of 5% or more of any class of  Capital  Stock of the
Company or with


<PAGE>



any Affiliate of the Company or any Restricted Subsidiary,  except upon fair and
reasonable terms no less favorable to the Company or such Restricted  Subsidiary
than could be obtained,  at the time of such transaction or, if such transaction
is  pursuant  to a  written  agreement,  at the  time  of the  execution  of the
agreement providing therefor,  in a comparable  arm's-length  transaction with a
Person that is not such a holder or an Affiliate.

   The  foregoing  limitation  does  not  limit,  and  shall  not  apply  to (i)
transactions  (A)  approved  by a majority of the  disinterested  members of the
Board of  Directors  or (B) for which the  Company  or a  Restricted  Subsidiary
delivers to the Trustees a written opinion of a nationally recognized investment
banking  firm  stating  that  the  transaction  is fair to the  Company  or such
Restricted  Subsidiary  from a  financial  point of view,  (ii) any  transaction
solely between the Company and any of its Wholly Owned  Restricted  Subsidiaries
or solely between  Wholly Owned  Restricted  Subsidiaries,  (iii) the payment of
reasonable  and  customary  regular fees to directors of the Company who are not
employees of the Company,  (iv) any payments or other  transactions  pursuant to
any  tax-sharing  agreement  between the Company and any other Person with which
the Company files a consolidated tax return or with which the Company is part of
a  consolidated  group  for  tax  purposes,  (v)  any  Restricted  Payments  not
prohibited by Section 4.04 or (vii) Kingston's and Matra's rights to commissions
and other  payments  under sales  representation  agreements;  Matra's rights to
payments,  including without limitation  incentive  payments,  under the Orion 1
Satellite  Contract and Orion 2 Satellite  Contract;  and  Kingston's  rights to
payments for services  under network  monitoring  contracts,  in each case as in
effect on the Closing  Date and with such  extensions,  amendments  and renewals
that may be entered  into on terms at least as  favorable  to the Company as the
terms  of  agreements  in  effect  on  the  Closing  Date.  Notwithstanding  the
foregoing,  any transaction  covered by the first paragraph of this Section 4.08
and not covered by clauses (ii)  through (v) of this  paragraph,  the  aggregate
amount of which  exceeds $5 million in value,  must be approved or determined to
be fair in the manner provided for in clause (i)(A) or (B) above.

                  SECTION 4.09.  Limitation on Liens . The Company will not, and
will not permit any Restricted Subsidiary to, create, incur, assume or suffer to
exist  any Lien on any of its  assets or  properties  of any  character,  or any
shares of Capital Stock or  Indebtedness of any Restricted  Subsidiary,  without
making effective  provision for all of the Notes and all other amounts due under
the  Indentures  to be directly  secured  equally  and ratably  with (or, if the
obligation or liability to be secured by such Lien is  subordinated  in right of
payment to the Notes,  prior to) the  obligation  or  liability  secured by such
Lien.

                  The foregoing limitation does not apply to:

                  (i)      Liens existing on the Closing Date;

                  (ii) Liens  granted  after the  Closing  Date on any assets or
         Capital Stock of the Company or its Restricted  Subsidiaries created in
         favor of the Holders;



<PAGE>




                  (iii)  Liens  with  respect  to  the  assets  of a  Restricted
         Subsidiary  granted by such  Restricted  Subsidiary to the Company or a
         Wholly Owned Restricted  Subsidiary to secure Indebtedness owing to the
         Company or such other Restricted Subsidiary;

                  (iv)  Liens  securing   Indebtedness   which  is  Incurred  to
         refinance secured  Indebtedness which is permitted to be Incurred under
         clause (iii) of the second paragraph of Section 4.03 of this Indenture;
         provided  that such  Liens do not  extend to or cover any  property  or
         assets of the  Company  or any  Restricted  Subsidiary  other  than the
         property or assets securing the Indebtedness being refinanced; or

                   (v) Permitted Liens.

The Company will not, and will not permit any Restricted  Subsidiary to, create,
incur,  assume or  suffer to exist any Lien on Orion 1,  Orion 2 or Orion 3 that
secures  Indebtedness,  other than pursuant to clause (xxi) of the definition of
Permitted Liens.

                  SECTION 4.10. Limitation on Sale-Leaseback  Transactions . The
Company will not, and will not permit any Restricted  Subsidiary to, directly or
indirectly,  enter  into any  sale-leaseback  transaction  involving  any of its
assets or  properties  whether  now owned or  hereafter  acquired,  whereby  the
Company or a Restricted  Subsidiary sells or transfers such assets or properties
and then or  thereafter  leases such assets or properties or any part thereof or
any other assets or properties which the Company or such Restricted  Subsidiary,
as the  case may be,  intends  to use for  substantially  the  same  purpose  or
purposes as the assets or properties sold or transferred.

                  The foregoing restriction does not apply to any sale-leaseback
transaction if (i) the lease is for a period,  including  renewal rights, of not
in excess of three  years;  (ii) the lease  secures  or  relates  to  industrial
revenue or pollution control bonds;  (iii) the transaction is solely between the
Company and any Wholly Owned  Restricted  Subsidiary  or solely  between  Wholly
Owned  Restricted   Subsidiaries;   or  (iv)  the  Company  or  such  Restricted
Subsidiary,  within  twelve  months  after the sale or transfer of any assets or
properties  is  completed,  applies  an amount  not less  than the net  proceeds
received  from  such  sale in  accordance  with  clause  (A) or (B) of the first
paragraph of Section 4.11 of this Indenture.

                  SECTION 4.11. Limitation on Asset Sales. The Company will not,
and will not permit any  Restricted  Subsidiary  to,  consummate  any Asset Sale
unless  (i)  the  consideration  received  by the  Company  or  such  Restricted
Subsidiary (including the amount of any Released Indebtedness) is at least equal
to the fair market value of the assets sold or disposed of and (ii) at least 85%
of  the   consideration   received   (excluding   the  amount  of  any  Released
Indebtedness)  consists of cash or Temporary Cash Investments.  In the event and
to the extent that the Net Cash  Proceeds  received by the Company or any of its
Restricted  Subsidiaries  from one or more Asset Sales occurring on or after the
Closing  Date in any period of 12  consecutive  months  exceed  10% of  Adjusted
Consolidated  Net  Tangible  Assets  (determined  as of the date  closest to the
commencement of such 12-month  period for which a consolidated  balance sheet of
the Company and its  subsidiaries  has been filed pursuant to Section 4.18, then
the Company shall or shall


<PAGE>



 cause the relevant Restricted  Subsidiary to (i) within twelve months after the
date Net Cash  Proceeds so  received  exceed 10% of  Adjusted  Consolidated  Net
Tangible  Assets (A) apply an amount  equal to such excess Net Cash  Proceeds to
permanently repay  unsubordinated  Indebtedness of the Company or any Restricted
Subsidiary  owing to a Person  other than the  Company or any of its  Restricted
Subsidiaries  or (B)  invest  an equal  amount,  or the  amount  not so  applied
pursuant to clause (A) (or enter into a definitive  agreement  committing  to so
invest within twelve  months after the date of such  agreement),  in property or
assets  (other  than  current  assets) of a nature or type or that are used in a
business (or in a company  having  property  and assets of a nature or type,  or
engaged in a business)  similar or related to the nature or type of the property
and assets of, or the business of, the Company and its  Restricted  Subsidiaries
existing on the date of such investment and (ii) apply (no later than the end of
the twelve-month period referred to in clause (i)) such excess Net Cash Proceeds
(to the extent not applied  pursuant to clause (i)) as provided in the following
paragraph  of this  Section  4.11.  The amount of such excess Net Cash  Proceeds
required  to  be  applied  (or  to  be  committed  to be  applied)  during  such
twelve-month period as set forth in clause (i) of the preceding sentence and not
applied  as so  required  by the end of such  period  shall  constitute  "Excess
Proceeds."

                  If, as of the first day of any calendar  month,  the aggregate
amount  of Excess  Proceeds  not  theretofore  subject  to an Offer to  Purchase
pursuant to this  Section  4.11 totals at least $10  million,  the Company  must
commence,  not  later  than  the  fifteenth  Business  Day of  such  month,  and
consummate  an  Offer  to  Purchase  from the  Holders  on a pro  rata  basis an
aggregate principal amount Notes equal to the Excess Proceeds on such date, at a
purchase  price equal 101% of the  Accreted  Value of the Notes,  plus,  in each
case, accrued interest (if any) to the Payment Date.

                  SECTION  4.12.  Maintenance  of Office or Agency.  The Company
will  maintain  an  office or agency  where  the  Notes may be  surrendered  for
registration of transfer or exchange or for  presentation  for payment and where
notices and demands to or upon the Company in respect of the Securities and this
Indenture  may be served.  The Company  will give prompt  written  notice to the
Trustee of the  location,  and any  change in the  location,  of such  office or
agency.  If at any time the  Company  shall fail to maintain  any such  required
office or agency or shall fail to furnish the Trustee with the address  thereof,
such presentations, surrenders, notices and demands may be made or served at the
address of the Trustee set forth in Section 11.02.

                  The Company may also from time to time  designate  one or more
other offices or agencies  where the Notes may be presented or  surrendered  for
any or all such  purposes and may from time to time  rescind such  designations.
The  Company  shall  give  prompt  written  notice  to the  Trustee  of any such
designation  or  rescission  and of any change in the location of any such other
office or agency.

                  The Company hereby  initially  designates the Corporate  Trust
Office of the Trustee as such office of the Company in  accordance  with Section
2.03.


<PAGE>





                  SECTION  4.13.  Repurchase  of Notes upon a Change of Control.
The Company  shall  commence,  within 30 days of the  occurrence  of a Change of
Control, and consummate an Offer to Purchase for all Notes then outstanding,  at
a purchase price equal to 101% of the Accreted Value of the Notes,  plus accrued
interest (if any) to the Payment Date.

                  SECTION 4.14. Existence . Subject to Articles Four and Five of
this Indenture,  the Company will do or cause to be done all things necessary to
preserve and keep in full force and effect its  existence  and the  existence of
each  Restricted  Subsidiary in accordance  with the  respective  organizational
documents  of the Company  and each such  Restricted  Subsidiary  and the rights
(whether pursuant to charter,  partnership  certificate,  agreement,  statute or
otherwise),  licenses  and  franchises  of the Company and each such  Restricted
Subsidiary, provided that the Company shall not be required to preserve any such
right,  license or  franchise,  or the  existence of any  Restricted  Subsidiary
(other than of the Company),  if the maintenance or  preservation  thereof is no
longer  desirable  in  the  conduct  of the  business  of the  Company  and  its
Restricted  Subsidiaries  taken  as a  whole;  and  provided  further,  that any
Restricted  Subsidiary  may  consolidate  with,  merge  into,  or  sell,  convey
transfer,  lease, or otherwise dispose of all or part of its property and assets
to the Company or any Wholly Owned Restricted Subsidiary.

                  SECTION 4.15.  Payment of Taxes and Other Claims . The Company
will pay or  discharge  and shall  cause each  Restricted  Subsidiary  to pay or
discharge,  or cause to be paid or  discharged,  before  the same  shall  become
delinquent (i) all material taxes,  assessments and governmental  charges levied
or imposed  upon (a) the  Company  or any such  Restricted  Subsidiary,  (b) the
income or profits of any such  Restricted  Subsidiary  which is a corporation or
(c) the property of the Company or any such  Restricted  Subsidiary and (ii) all
material lawful claims for labor,  materials and supplies that, if unpaid, might
by law become a Lien upon the  property  of the  Company or any such  Restricted
Subsidiary, provided that the Company shall not be required to pay or discharge,
or cause to be paid or discharged, any such tax, assessment, charge or claim the
amount,  applicability  or validity of which is being contested in good faith by
appropriate  proceedings or by the Company and its Restricted Subsidiaries where
the failure to effect such payment is not adverse in any material respect to the
Holders.

                  SECTION 4.16.  Maintenance  of Properties  and Insurance . The
Company  will  maintain  (a)  in-orbit  insurance  with respect to Orion 1 in an
amount at least equal to the cost to replace such  satellite with a satellite of
comparable or superior  technological  capability  (as estimated by the Board of
Directors) and having at least as much transmission  capacity as such satellite,
and (b) with respect to Orion 2, Orion 3, each other satellite to be launched by
the  Company  or  any  Restricted  Subsidiary  and  each  replacement  satellite
therefor,  (i) launch insurance with respect to each such satellite covering the
period from the launch of such satellite to 180 days following such launch in an
amount  equal  to or  greater  than  the sum of (A) the  cost  to  replace  such
satellite  pursuant to the contract  pursuant to which a  replacement  satellite
will be constructed,  (B) the cost to launch a replacement satellite pursuant to
the contract pursuant to which a replacement  satellite will be launched and (C)
the cost of launch  insurance  for such  satellite  or,  in the  event  that the
Company has reason to believe  that the cost of obtaining  comparable  insurance
for a replacement  satellite  would be  materially  higher,  the Company's  best
estimate  of the  cost of  such  comparable  insurance  and  (ii)  at all  times
subsequent to 180 days


<PAGE>



 after  the  launch  (if it is a  Successful  Launch)  of each  such  satellite,
in-orbit  insurance  in an amount  at least  equal to the cost to  replace  such
satellite  with a satellite of comparable or superior  technological  capability
(as  estimated  by  the  Board  of  Directors)  and  having  at  least  as  much
transmission  capacity as such  satellite  was  designed to have.  The  in-orbit
insurance  required by this Section 4.16 shall  provide that if 50% or more of a
satellite's  initial  capacity is lost, the full amount of insurance will become
due and payable,  and that if a satellite is able to maintain  more than 50% but
less than 90% of its initial capacity, a pro-rata portion of such insurance will
become due and payable.  The insurance  required by this Section 4.16 shall name
the Company  and/or any Guarantor as the sole loss payee or payees,  as the case
may be, thereof.

                  In the  event  that  the  Company  (or a  Guarantor)  receives
proceeds from insurance relating to any satellite,  the Company (or a Guarantor)
may use a portion of such proceeds to repay any vendor or  third-party  purchase
money  financing  pertaining  to such  satellite  (other  than  Orion 1) that is
required  to be  repaid  by reason  of the loss  giving  rise to such  insurance
proceeds. The Company (or a Guarantor) may use the remainder of such proceeds to
develop,  construct,  launch  and  insure  a  replacement  satellite  (including
components for a related ground spare) if (i) such  replacement  satellite is of
comparable or superior  technological  capability as compared with the satellite
being replaced and has at least as much  transmission  capacity as the satellite
being  replaced and (ii) the Company will have  sufficient  funds to service the
Company's projected debt service requirements until the scheduled launch of such
replacement  satellite and for one year  thereafter  and to develop,  construct,
launch and insure (in the amounts  required  by the  preceding  paragraph)  such
replacement satellite,  provided that such replacement satellite is scheduled to
be launched within 15 months of the receipt of such proceeds.  Any such proceeds
not used as permitted by this Section 4.16 shall be applied,  within 90 days, to
reduce  Indebtedness of the Company or shall  constitute  "Excess  Proceeds" for
purposes of Section 4.11.

                  The Company shall further provide or cause to be provided, for
itself  and  its  Restricted  Subsidiaries,   insurance  (including  appropriate
self-insurance) against loss or damage of the kinds considered reasonable by the
Company in the conduct of its business.

                  The Company will cause all properties  owned by the Company or
any  Subsidiary  or used or held for use in the  conduct of its  business or the
business of any Subsidiary to be maintained and kept in good  condition,  repair
and working order and supplied with all necessary equipment and will cause to be
made all necessary repairs, renewals, replacements, betterments and improvements
thereof,  all as in the  judgment of the Company  may be  necessary  so that the
business carried on in connection  therewith may be properly and  advantageously
conducted  at all times;  provided,  however,  that nothing in this Section 4.16
shall  prevent the Company from  discontinuing  the  maintenance  of any of such
properties if such discontinuance is, in the judgment of the Company,  desirable
in the  conduct  of its  business  or the  business  of any  Subsidiary  and not
disadvantageous in any material respect to the Holders.


<PAGE>





                  SECTION  4.17.  Compliance  Certificates  . The  Company  will
deliver to the  Trustee,  within 120 days after the end of each fiscal  year,  a
brief  certificate from the principal  executive  officer,  principal  financial
officer  or  principal  accounting  officer  as to his or her  knowledge  of the
Company's compliance with all conditions and covenants under this Indenture. For
purposes of this Section  4.17,  such  compliance  shall be  determined  without
regard to any period of grace or requirement of notice under this Indenture.

                  SECTION  4.18.  Commission  Reports  and  Reports to  Holders.
Whether or not the Company is required to file reports with the Commission,  the
Company shall file with the Commission all such reports and other information as
it would be required  to file with the  Commission  by  Sections  13(a) or 15(d)
under the Notes  Exchange  Act of 1934 if it were subject  thereto.  The Company
shall  supply the  Trustees  and each Holder or shall supply to the Trustees for
forwarding  to each such Holder,  without  cost to such  Holder,  copies of such
reports and other information.

                  SECTION  4.19.  Waiver of Stay,  Extension or Usury Laws . The
Company  covenants  (to the extent that it may lawfully do so) that it shall not
at any time insist upon, or plead, or in any manner whatsoever claim or take the
benefit or advantage of, any stay or extension law or any usury law or other law
that would prohibit or forgive the Company from paying all or any portion of the
principal of, premium, if any, or interest on the Notes as contemplated  herein,
wherever enacted,  now or at any time hereafter in force, or that may affect the
covenants or the performance of this  Indenture,  and (to the extent that it may
lawfully do so) the Company hereby  expressly waives all benefit or advantage of
any such  law and  covenants  that it will  not  hinder,  delay  or  impede  the
execution  of any power  herein  granted to the  Trustee,  but shall  suffer and
permit the execution of every such power as though no such law had been enacted.

                  SECTION  4.20.  Calculation  of Original  Issue  Discount  and
Certain  Information  Concerning Tax Reporting.  The Company will deliver to the
Trustee,  within  40 days of the date of  original  issuance  of the  Notes,  an
Officers'  Certificate,  setting  forth  (i) the  amount of the  original  issue
discount on the Notes, expressed as a U.S. dollar amount per $1,000 of principal
amount at Stated Maturity, (ii) the yield to maturity for the Notes, and (iii) a
table of the amount of the original issue discount on the Notes,  expressed as a
U.S. dollar amount per $1,000 of principal  amount at Stated  Maturity,  accrued
for each day from the date of  original  issuance  of the Notes to their  Stated
Maturity.

                  On or before  December 15 of each year during  which any Notes
are  outstanding,  the Company shall furnish to the Trustee such  information as
may be reasonably requested by the Trustee in order that the Trustee may prepare
the information which it is required to report for such year on Internal Revenue
Service  Forms 1096 and 1099  pursuant to Section 6049 of the  Internal  Revenue
Code of 1986, as amended.  Such information shall include the amount of original
issue  discount  includable  in income for each  $1,000 of  principal  amount at
Stated Maturity of outstanding Notes during such year.


<PAGE>





                                  ARTICLE FIVE
                              SUCCESSOR CORPORATION

                  SECTION 5.01. Consolidation,  Merger and Sale of Assets . Each
of the Company and each Guarantor will not consolidate with, merge with or into,
or sell,  convey,  transfer,  lease or otherwise dispose of all or substantially
all of its property and assets (as an entirety or  substantially  an entirety in
one  transaction or a series of related  transactions)  to, any Person or permit
any Person to merge with or into the Company or any Guarantor unless:

                  (i) the Company or any Guarantor, as the case may be, shall be
the  continuing  Person,  or the Person (if other than the Company or Guarantor)
formed by such consolidation or into which the Company or any Guarantor,  as the
case may be, is merged or that  acquired or leased such  property  and assets of
the  Company  or any  Guarantor,  as the  case may be,  shall  be a  corporation
organized and validly existing under the laws of the United States of America or
any  jurisdiction   thereof  and  shall  expressly  assume,  by  a  supplemental
indenture, executed and delivered to the Trustees, all of the obligations of the
Company or any Guarantor,  as the case may be, on all of the Notes and under the
Indenture;

                  (ii) immediately after giving effect to such  transaction,  no
         Default or Event of Default shall have occurred and be continuing;

                  (iii)  if  such  transaction   involves  the  Company  or  any
         Significant Subsidiary thereof, immediately after giving effect to such
         transaction on a pro forma basis,  the Company,  or any Person becoming
         the  successor  to the  Company as  obligor  on the Notes  shall have a
         Consolidated  Net Worth equal to or greater than the  Consolidated  Net
         Worth of the Company immediately prior to such transaction;

                  (iv)  if  such   transaction   involves  the  Company  or  any
         Significant Subsidiary thereof, immediately after giving effect to such
         transaction on a pro forma basis,  the Company,  or any Person becoming
         the successor  obligor of the Notes, as the case may be, could Incur at
         least $1.00 of Indebtedness  under the first paragraph of Section 4.03;
         provided  that this clause (iv) shall not apply to a  consolidation  or
         merger  with  or  into a  Wholly  Owned  Restricted  Subsidiary  with a
         positive net worth;  provided that, in connection  with any such merger
         or  consolidation,  no  consideration  (other than Common  Stock in the
         surviving  Person or the Company) shall be issued or distributed to the
         stockholders of the Company; and

                  (v) the Company or Guarantor,  as the case may be, delivers to
         the  Trustees  an  Officers'  Certificate   (attaching  the  arithmetic
         computations to demonstrate compliance with clauses (iii) and (iv)) and
         Opinion  of  Counsel,  in each case  stating  that such  consolidation,
         merger or transfer and such supplemental  indenture  complies with this
         provision  and  that  all  conditions  precedent  provided  for  herein
         relating  to  such  transaction  have  been  complied  with;  provided,
         however, that clauses (iii) and (iv) above do not apply if, in the good
         faith determination of the Board of Directors of the Company,


<PAGE>



          whose  determination  shall be  evidenced by a Board  Resolution,  the
          principal  purpose  of such  transaction  is to  change  the  state of
          incorporation  of the  Company;  and  provided  further  that any such
          transaction  shall not have as one of its  purposes the evasion of the
          foregoing limitations.

                  Notwithstanding the foregoing,  the provisions of this Section
5.01 shall not apply to the Merger.

                  SECTION 5.02.  Successor  Substituted . Upon any consolidation
or merger,  or any sale,  conveyance,  transfer or other  disposition  of all or
substantially  all of the property and assets of the Company in accordance  with
Section  5.01  of  this   Indenture,   the  successor   Person  formed  by  such
consolidation  or into  which  the  Company  is merged  or to which  such  sale,
conveyance,  transfer  or other  disposition  is made shall  succeed  to, and be
substituted  for, and may exercise  every right and power of, the Company  under
this Indenture  with the same effect as if such successor  Person had been named
as the  Company  herein  and  thereafter,  except  in the case of a  lease,  the
predecessor Person shall be relieved of all obligations and covenants under this
Indenture and the Notes.


                                           ARTICLE SIX
                                      DEFAULT AND REMEDIES

                  SECTION 6.01.  Events of Default . An "Event of Default" shall
occur with respect to the Notes if:

                  (a) default in the payment of  principal  of (or  premium,  if
         any,  on) any Note when the same  becomes due and payable at  maturity,
         upon acceleration, redemption or otherwise;

                  (b)  default in the  payment of  interest on any Note when the
         same becomes due and payable,  and such default  continues for a period
         of 30  days;  provided  that a  failure  to make any of the  first  six
         scheduled  interest  payments  on the  Notes  in a timely  manner  will
         constitute an Event of Default with no grace or cure period;

                  (c) default in the  performance or breach of the provisions of
         Section 5.01 of this  Indenture or the failure to make or consummate an
         Offer to Purchase in  accordance  with  Section 4.11 or Section 4.13 of
         this Indenture;

                  (d) the Company defaults in the performance of or breaches any
         other  covenant or agreement of the Company in this  Indenture or under
         the Notes  (other than a default  specified  in clause (a),  (b) or (c)
         above)  and  such  default  or  breach  continues  for a  period  of 30
         consecutive  days after written notice by the Trustee or the Holders of
         25% or more in aggregate principal amount at maturity of the Notes;


<PAGE>





                  (e) there  occurs  with  respect to (A) any issue or issues of
         Indebtedness   of  the  Company,   any  Guarantor  or  any  Significant
         Subsidiary  having an  outstanding  principal  amount of $10 million or
         more in the aggregate for all such issues of all such Persons,  whether
         such  Indebtedness  now exists or shall hereafter be created or (B) the
         TT&C  Financing  or  any  refinancing   thereof  which  is  secured  by
         substantially  the same  collateral,  (I) an event of default  that has
         caused the holder  thereof to declare such  Indebtedness  to be due and
         payable prior to its Stated Maturity and such Indebtedness has not been
         discharged  in full or such  acceleration  has not  been  rescinded  or
         annulled within 30 days of such acceleration and/or (II) the failure to
         make a  principal  payment  at the final  (but not any  interim)  fixed
         maturity and such defaulted payment shall not have been made, waived or
         extended within 30 days of such payment default;

                  (f) any final judgment or order (not covered by insurance) for
         the payment of money in excess of $10 million in the  aggregate for all
         such final  judgments or orders against all such Persons  (treating any
         deductibles,  self-insurance  or retention as not so covered)  shall be
         rendered  against  the  Company,   any  Guarantor  or  any  Significant
         Subsidiary and shall not be paid or discharged,  and there shall be any
         period of 30 consecutive  days following entry of the final judgment or
         order that causes the aggregate  amount for all such final judgments or
         orders  outstanding and not paid or discharged against all such Persons
         to exceed $10 million  during which a stay of enforcement of such final
         judgment or order,  by reason of a pending  appeal or otherwise,  shall
         not be in effect;

                  (g) a court  having  jurisdiction  in the  premises  enters  a
         decree or order for (A) relief in respect of the Company, any Guarantor
         or  any  Significant  Subsidiary  in  an  involuntary  case  under  any
         applicable bankruptcy, insolvency or other similar law now or hereafter
         in  effect,  (B)  appointment  of  a  receiver,  liquidator,  assignee,
         custodian,  trustee,  sequestrator or similar  official of the Company,
         any Guarantor or any Significant Subsidiary or for all or substantially
         all of the  property and assets of the  Company,  any  Guarantor or any
         Significant  Subsidiary  or (C) the  winding up or  liquidation  of the
         affairs of the Company or any Significant Subsidiary and, in each case,
         such decree or order shall  remain  unstayed and in effect for a period
         of 30 consecutive days;

                  (h) the Company,  any Guarantor or any Significant  Subsidiary
         (A)  commences  a  voluntary  case  under  any  applicable  bankruptcy,
         insolvency or other similar law now or hereafter in effect, or consents
         to the entry of an order for  relief in an  involuntary  case under any
         such law, (B) consents to the appointment of or taking  possession by a
         receiver,  liquidator,  assignee,  custodian,  trustee, sequestrator or
         similar  official of the  Company,  any  Guarantor  or any  Significant
         Subsidiary or for all or  substantially  all of the property and assets
         of the Company,  any  Guarantor or any  Significant  Subsidiary  or (C)
         effects any general assignment for the benefit of creditors;

                  (i) the Note Guarantee shall cease to be, or shall be asserted
         in writing by the Company or any Guarantor not to be, in full force and
         effect or enforceable in accordance with their respective terms; or


<PAGE>




                  (j) the  occurrence  of an "Event  of  Default"  described  in
         paragraph  (i),  (j),  (k),  (l),  (m) or (n) of  Section  18.1  of the
         Debenture Purchase Agreement.

                  SECTION  6.02.  Acceleration  . If an Event of Default  (other
than an Event of Default  specified  in clause (g) or (h) above that occurs with
respect  to the  Company)  occurs and is  continuing  under the  Indenture,  the
Trustee or the Holders of at least 25% in aggregate principal amount at maturity
of the Notes then  outstanding,  by written  notice to the  Company  (and to the
Trustee if such  notice is given by the  Holders),  may,  and the Trustee at the
request of such Holders shall,  declare the Accreted Value of, premium,  if any,
and accrued  interest on the Notes to be  immediately  due and  payable.  Upon a
declaration of  acceleration,  such principal  amount of,  premium,  if any, and
accrued  interest  shall  be  immediately  due and  payable.  In the  event of a
declaration of acceleration  because an Event of Default set forth in clause (e)
above has occurred and is continuing,  such declaration of acceleration shall be
automatically  rescinded  and annulled if the event of default  triggering  such
Event of  Default  pursuant  to  clause  (e) shall be  remedied  or cured by the
Guarantor,  the Company or the relevant Significant  Subsidiary or waived by the
holders of the relevant  Indebtedness  within 60 days after the  declaration  of
acceleration  with respect thereto.  If an Event of Default  specified in clause
(g) or (h) above  occurs  with  respect to the  Guarantor  or the  Company,  the
Accreted  Value of,  premium,  if any,  and  accrued  interest on the Notes then
outstanding  shall ipso facto become and be immediately  due and payable without
any declaration or other act on the part of the Trustee or any Holder.

                  SECTION 6.03.  Other  Remedies . If an Event of Default occurs
and is continuing,  the Trustee may pursue any available remedy by proceeding at
law or in equity to collect the payment of Accreted Value of,  premium,  if any,
interest  on the Notes or to enforce the  performance  of any  provision  of the
Notes or this Indenture.

                  The  Trustee  may  maintain a  proceeding  even if it does not
possess any of the Notes or does not produce any of them in the proceeding.

                  SECTION  6.04.  Waiver of Past  Defaults  . Subject to Section
9.02, at any time after a declaration of acceleration,  but before a judgment or
decree for the payment of the money due has been  obtained by the  Trustee,  the
Holders of at least a majority in principal  amount of the outstanding  Notes at
maturity,  by notice to the Trustee,  may waive all past  Defaults and Events of
Default and rescind and annul a declaration of acceleration (except a Default in
the  payment of  Accreted  Value of,  premium,  if any,  interest on any Note as
specified  in  clause  (a) or (b) of  Section  6.01 (but not as a result of such
acceleration)  or in respect of a covenant or provision of this Indenture  which
cannot  be  modified  or  amended  without  the  consent  of the  holder of each
outstanding  Note  affected) if all existing  Events of Default,  other than the
nonpayment of Accreted  Value of,  premium,  if any,  interest on the Notes that
have become due solely by such declaration of  acceleration,  have been cured or
waived and the  rescission  would not conflict  with any judgment or decree of a
court of competent jurisdiction.  Upon any such waiver, such Default shall cease
to exist,  and any Event of Default  arising  therefrom  shall be deemed to have
been cured, for every purpose of this Indenture; but no such waiver shall extend
to any  subsequent  or other  Default  or Event of  Default  or impair any right
consequent thereto


<PAGE>



                  SECTION 6.05.  Control by Majority . The Holders of at least a
majority in aggregate  principal amount at maturity of the outstanding Notes may
direct the time,  method and place of conducting  any  proceeding for any remedy
available  to the  Trustee or  exercising  any trust or power  conferred  on the
Trustee.  However, the Trustee may refuse to follow any direction that conflicts
with law or this Indenture,  that may involve the Trustee in personal liability,
or that the Trustee  determines in good faith may be unduly  prejudicial  to the
rights of Holders of Notes not joining in the giving of such  direction  and may
take any other  action it deems  proper that is not  inconsistent  with any such
direction received from Holders of Notes.

                  SECTION  6.06.  Limitation  on Suits . A Holder may not pursue
any remedy with respect to this Indenture or the Notes unless:

                  (i)  the  Holder  gives  the  Trustee   written  notice  of  a
         continuing Event of Default;

                  (ii) the Holders of at least 25% in aggregate principal amount
         at maturity of outstanding  Notes make a written request to the Trustee
         to pursue the remedy;

                  (iii)  such  Holder or  Holders  offer the  Trustee  indemnity
         satisfactory to the Trustee against any costs, liability or expense;

                  (iv) the Trustee  does not comply  with the request  within 60
         days after receipt of the request and the offer of indemnity; and

                  (v) during  such 60-day  period,  the Holders of a majority in
         aggregate  principal amount at maturity of the outstanding Notes do not
         give the Trustee a direction that is inconsistent with the request.

                  SECTION 6.07.  Rights of Holders to Receive  Payment . Subject
to  Sections  6.04  and  9.02,  notwithstanding  any  other  provision  of  this
Indenture,  the right of any  Holder of a Note to receive  payment  of  Accreted
Value of,  premium,  if any, or interest  on, such Note or to bring suit for the
enforcement  of any such  payment or after the due date  expressed  in the Notes
shall not be impaired or affected  without the consent of such Holder  provided,
however,  that no recourse for the payment of the Accreted Value of, premium, if
any, or interest on any of the Notes or for any claim based thereon or otherwise
in respect  thereof,  and no recourse under or upon any obligation,  covenant or
agreement of the Company in the  Indentures or in any of the Notes or because of
the creation of any Indebtedness  represented thereby,  shall be had against any
incorporator,  stockholder, officer, director, employee or controlling person of
the Company or of any successor  Person thereof.  Each Holder,  by accepting the
Notes, waives and releases all such liability.

                  SECTION  6.08.   Collection  of  Indebtedness  and  Suits  for
Enforcement by Trustee.

                  The Company covenants that if


<PAGE>




                  (a)  default  is made in the  payment  of any  installment  of
         interest  on any Note when such  interest  becomes  due and payable and
         such default continues for a period of 30 days, or

                  (b)  default is made in the  payment of the  principal  of (or
         premium, if any, on) any Note at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to the Trustee for the benefit
of the  Holders of such  Notes,  the whole  amount  then due and payable on such
Notes for  principal  (and premium,  if any) and  interest,  and interest on any
overdue principal (and premium,  if any) and, to the extent that payment of such
interest shall be legally enforceable, upon any overdue installment of interest,
at the rate borne by the Notes, and, in addition thereto, such further amount as
shall be sufficient to cover the costs and expenses of collection, including the
reasonable  compensation,  expenses,  disbursements and advances of the Trustee,
its agents and counsel.

                  If the Company fails to pay such amounts  forthwith  upon such
demand,  the  Trustee,  in its own name as  trustee  of an  express  trust,  may
institute  a  judicial  proceeding  for the  collection  of the  sums so due and
unpaid,  may  prosecute  such  proceeding  to judgment  or final  decree and may
enforce the same  against the  Company or any other  obligor  upon the Notes and
collect the moneys  adjudged or decreed to be payable in the manner  provided by
law out of the  property  of the  Company or any other  obligor  upon the Notes,
wherever situated.

                  If an Event of Default occurs and is  continuing,  the Trustee
may in its  discretion  proceed to protect and enforce its rights and the rights
of the Holders by such  appropriate  judicial  proceedings  as the Trustee shall
deem most  effectual  to protect and enforce  any such  rights,  whether for the
specific enforcement of any covenant or agreement in this Indenture or in aid of
the exercise of any power granted herein, or to enforce any other proper remedy.

                  SECTION  6.09.  Trustee  May File Proofs of Claim . In case of
the  pendency  of  any  receivership,   insolvency,   liquidation,   bankruptcy,
reorganization,   arrangement,   adjustment,   composition   or  other  judicial
proceeding  relative to the Company or any other  obligor  upon the Notes or the
property of the Company or of such other obligor or their creditors, the Trustee
(irrespective  of  whether  the  principal  of the Notes  shall  then be due and
payable as therein  expressed or by declaration or otherwise and irrespective of
whether the Trustee shall have made any demand on the Company for the payment of
overdue  principal,  premium,  if  any,  or  interest)  shall  be  entitled  and
empowered, by intervention in such proceeding or otherwise,

                  (i) to file  and  prove  a  claim  for  the  whole  amount  of
         principal  (and  premium,  if any) and  interest  owing  and  unpaid in
         respect of the Notes and to file such other  papers or documents as may
         be  necessary  or  advisable in order to have the claims of the Trustee
         (including  any  claim  for  the  reasonable  compensation,   expenses,
         disbursements and advances of the Trustee,  its agents and counsel) and
         of the Holders allowed in such judicial proceeding, and


<PAGE>




                  (ii) to  collect  and  receive  any  moneys or other  property
         payable or deliverable on any such claims and to distribute the same;

and any custodian,  receiver,  assignee,  trustee,  liquidator,  sequestrator or
similar  official in any such judicial  proceeding is hereby  authorized by each
Holder to make such  payments to the Trustee  and, in the event that the Trustee
shall consent to the making of such payments directly to the Holders, to pay the
Trustee  any  amount  due  it  for  the   reasonable   compensation,   expenses,
disbursements and advances of the Trustee, its agents and counsel, and any other
amounts due the Trustee under Section 7.07.

                  Nothing  herein  contained  shall be deemed to  authorize  the
Trustee  to  authorize  or consent to or accept or adopt on behalf of any Holder
any plan of reorganization, arrangement, adjustment or composition affecting the
Notes or the rights of any Holder  thereof,  or to authorize the Trustee to vote
in respect of the claim of any Holder in any such proceeding.


                  SECTION 6.10.  Priorities . If the Trustee  collects any money
pursuant to this Article Six, it shall pay out the money in the following order:

                  First:  to the Trustee for all amounts due under Section 7.07;

                  Second:  to  Holders  for  amounts  then  due and  unpaid  for
         principal of,  premium,  if any, and interest,  if any, on the Notes in
         respect  of  which or for the  benefit  of which  such  money  has been
         collected,  ratably,  without  preference  or  priority  of  any  kind,
         according  to the amounts due and payable on such Notes for  principal,
         premium, if any, and interest, if any, respectively; and

                  Third: the balance,  if any, to the Person or Persons entitled
         thereto.

                  The Trustee, upon prior written notice to the Company, may fix
a record  date and  payment  date for any  payment to Holders  pursuant  to this
Section 6.10.

                  [SECTION  6.11.  Undertaking  for  Costs . In any suit for the
enforcement  of any right or remedy under this  Indenture or in any suit against
the  Trustee  for any  action  taken or omitted  by it as  Trustee,  a court may
require any party  litigant in such suit to file an undertaking to pay the costs
of the suit, and the court may assess  reasonable  costs,  including  reasonable
attorneys' fees, against any party litigant in the suit having due regard to the
merits and good faith of the claims or defenses made by the party litigant. This
Section  6.11  does  not  apply  to a suit by the  Trustee,  a suit by a  Holder
pursuant to Section  6.07 of this  Indenture,  or a suit by Holders of more than
10% in principal amount of the outstanding Notes.]

                  [SECTION  6.12.  Restoration  of Rights and  Remedies . If the
Trustee or any Holder has  instituted  any  proceeding  to enforce  any right or
remedy  under  this  Indenture  and such  proceeding  has been  discontinued  or
abandoned for any reason, or has been determined  adversely to the Trustee or to
such Holder, then, and in every such case, subject to any


<PAGE>



determination in such proceeding, the Company, the Trustee and the Holders shall
be restored  severally and respectively to their former positions  hereunder and
thereafter  all rights and remedies of the Company,  the Trustee and the Holders
shall continue as though no such proceeding had been instituted.]

                  SECTION  6.13.  Rights  and  Remedies  Cumulative  . Except as
otherwise  provided  with respect to the  replacement  or payment of  mutilated,
destroyed,  lost or stolen  Notes in  Section  2.08,  no right or remedy  herein
conferred  upon or  reserved  to the Trustee or to the Holders is intended to be
exclusive of any other right or remedy, and every right and remedy shall, to the
extent  permitted by law, be cumulative and in addition to every other right and
remedy  given  hereunder  or now or  hereafter  existing  at law or in equity or
otherwise.  The  assertion or employment  of any right or remedy  hereunder,  or
otherwise, shall not prevent the concurrent assertion or employment of any other
appropriate right or remedy.

                  SECTION  6.14.  Delay  or  Omission  Not  Waiver . No delay or
omission  of the  Trustee  or of any  Holder  to  exercise  any  right or remedy
accruing  upon any Event of  Default  shall  impair  any such right or remedy or
constitute  a waiver of any such Event of Default  or an  acquiescence  therein.
Every right and remedy  given by this Article Six or by law to the Trustee or to
the Holders may be  exercised  from time to time,  and as often as may be deemed
expedient, by the Trustee or by the Holders, as the case may be.


                                  ARTICLE SEVEN
                                     TRUSTEE

                  SECTION 7.01. General . The duties and responsibilities of the
Trustee shall be as provided by the TIA and as set forth herein.  Whether or not
herein expressly so provided,  every provision of this Indenture relating to the
conduct or affecting  the  liability of or affording  protection  to the Trustee
shall be subject to the provisions of this Article Seven.

                  SECTION  7.02.  Certain  Rights of  Trustee .  Subject  to TIA
Sections 315(a) through (d):

                  (a) except during the continuance of an Event of Default,  the
Trustee  undertakes  to  perform  such  duties  and  only  such  duties  as  are
specifically  set  forth  in  this  Indenture,   and  no  implied  covenants  or
obligations  shall be read into this  Indenture  against  the Trustee and in the
absence of bad faith on its part, the Trustee may  conclusively  rely, as to the
truth and correctness of the statements and  certificates or opinions  furnished
to it and conforming to the  requirements of this Indenture;  but in the case of
any such certificates or opinions which by any provision hereof are specifically
required to be furnished to the  Trustee,  the Trustee  shall be under a duty to
examine the same to determine whether or not they conform to the requirements of
this Indenture;

                  (b)  in  case  an  Event  of  Default  has   occurred  and  is
continuing,  the Trustee shall  exercise such of the rights and powers vested in
it by this Indenture, and use the


<PAGE>



         same  degree of care and  skill in its  exercise,  as a prudent  person
would  exercise or use under the  circumstances  in the conduct of such person's
own affairs;

                  (c) any request or direction of the Company  mentioned  herein
         shall be  sufficiently  evidenced by a Company Request or Company Order
         and any  resolution  of the  Board  of  Directors  may be  sufficiently
         evidenced by a Board Resolution;

                  (d)  whenever  in the  administration  of this  Indenture  the
         Trustee shall deem it desirable  that a matter be proved or established
         prior to  taking,  suffering  or  omitting  any action  hereunder,  the
         Trustee (unless other evidence be herein specifically  prescribed) may,
         in the  absence  of bad  faith  on its  part,  rely  upon  an  Officers
         Certificate;

                  (e) the  Trustee  may  consult  with  counsel  and the written
         advice of such  counsel or any  Opinion  of  Counsel  shall be full and
         complete  authorization  and protection in respect of any action taken,
         suffered  or omitted  by it  hereunder  in good  faith and in  reliance
         thereon;

                  (f) the Trustee  shall be under no  obligation to exercise any
         of the rights or powers  vested in it by this  Indenture at the request
         or direction of any of the Holders  pursuant to this Indenture,  unless
         such Holders shall have offered to the Trustee  reasonable  security or
         indemnity  against the costs,  expenses and liabilities  which might be
         incurred by it in compliance with such request or direction;

                  (g) the Trustee  shall not be bound to make any  investigation
         into the  facts  or  matters  stated  in any  resolution,  certificate,
         statement,  instrument,  opinion,  report, notice, request,  direction,
         consent,  order, bond, debenture,  note, other evidence of indebtedness
         or other paper or document,  but the Trustee,  in its  discretion,  may
         make such further inquiry or  investigation  into such facts or matters
         as it may see fit,  and, if the Trustee  shall  determine  to make such
         further inquiry or  investigation,  it shall be entitled to examine the
         books,  records and premises of the Company,  personally or by agent or
         attorney;

                  (8) the  Trustee  may  execute  any of the  trusts  or  powers
         hereunder  or perform  any duties  hereunder  either  directly or by or
         through  agents or attorneys and the Trustee  shall not be  responsible
         for any  misconduct  or negligence on the part of any agent or attorney
         appointed with due care by it hereunder; and

                  (9) the  Trustee  shall not be liable  for any  action  taken,
         suffered  or  omitted  by it in good  faith  and  believed  by it to be
         authorized or within the discretion or rights or powers  conferred upon
         it by this Indenture.

                  The  Trustee  shall not be  required to expend or risk its own
funds or otherwise  incur any financial  liability in the  performance of any of
its duties  hereunder,  or in the  exercise of any of its rights or powers if it
shall have reasonable grounds for believing that repayment


<PAGE>



 of such funds or  adequate  indemnity  against  such risk or  liability  is not
reasonably assured to it.

                  SECTION 7.03.  Individual Rights of Trustee . The Trustee,  in
its individual or any other  capacity,  may become the owner or pledgee of Notes
and may otherwise deal with the Company or its  Affiliates  with the same rights
it would  have if it were not the  Trustee.  Any Agent may do the same with like
rights. However, the Trustee is subject to TIA Sections 310(b) and 311.

                  SECTION 7.04.  Trustee's Disclaimer . The Trustee (i) makes no
representation  as to the  validity or adequacy of this  Indenture or the Notes,
(ii)  shall not be  accountable  for the  Company's  use or  application  of the
proceeds  from the Notes and (iii) shall not be  responsible  for any  statement
contained  herein or in the Notes other than its certificate of  authentication.
The  Trustee  shall not be charged  with  knowledge  of any  Default or Event of
Default  unless  (i) a  Responsible  Officer  of  the  Trustee  assigned  to its
Corporate Trustee  Administration  Department (or successor department or group)
shall have  actual  knowledge  thereof or (ii) the Trustee  shall have  received
written  notice  thereof at its  Corporate  Trust office from the Company or any
Holder.  No provision of this  Indenture  shall require the Trustee to expend or
risk its own funds or otherwise incur any financial liability in the performance
of any of its  duties  hereunder,  or in the  exercise  of any of its  rights or
powers, if it shall have reasonable grounds for believing that repayment of such
funds or adequate  indemnity  against such risk or  liability is not  reasonably
assured to it.

                  SECTION 7.05.  Notice of Default . If any Default or any Event
of Default  occurs and is continuing  and if such Default or Event of Default is
known to a trust  officer of the Trustee,  the Trustee shall mail to each Holder
in the manner and to the extent  provided in TIA Section  313(c)  notice of such
Default or Event of Default within 90 days after it occurs,  unless such Default
or Event of Default has been cured; provided,  however, that, except in the case
of a default in the payment of the principal of, premium, if any, or interest on
any Note,  the Trustee shall be protected in  withholding  such notice if and so
long as the board of directors,  the executive committee or a trust committee of
directors  and/or  Responsible  Officers of the Trustee in good faith determines
that the withholding of such notice is in the interest of the Holders.

                  SECTION  7.06.  Reports  by Trustee to Holders . To the extent
required  by TIA  Section  313(a),  within  60 days  after  May 15 of each  year
commencing with 1997 and for as long as there are Notes  outstanding  hereunder,
the Trustee  shall mail to each Holder the  Trustee's  brief  report dated as of
such date that complies with TIA Section  313(a).  The Trustee also shall comply
with TIA Section 313(b) and TIA Section 313(c) and (d). A copy of such report at
the time of its  mailing  to  Holders  shall be filed  with the  Commission,  if
required, and each stock exchange, if any, on which the Notes are listed.

                  The  Company  shall  promptly  notify the Trustee if the Notes
become  listed on any stock  exchange,  and the  Trustee  shall  comply with TIA
Section 313(d).


<PAGE>




                  SECTION 7.07.  Compensation  and Indemnity . The Company shall
pay to the Trustee from time to time such  reasonable  compensation  as shall be
agreed upon in writing for its  services.  The  reasonable  compensation  of the
Trustee  shall not be  limited  by any law on  compensation  of a trustee  of an
express  trust.  The Company  shall  reimburse  the Trustee upon request for all
reasonable  out-of-pocket expenses and advances incurred or made by the Trustee.
Such expenses  shall  include the  reasonable  compensation  and expenses of the
Trustee's agents and counsel.

                  The  Company  shall  indemnify  the Trustee  for,  and hold it
harmless  against,  any loss or  liability  or  expense  incurred  by it without
negligence  or bad  faith  on its part in  connection  with  the  acceptance  or
administration  of this  Indenture  and its duties under this  Indenture and the
Notes, including, without limitation, the costs and expenses of defending itself
against any claim or liability and of complying  with any process served upon it
or any of its officers in connection  with the exercise or performance of any of
its powers or duties under this Indenture and the Notes.

                  To secure the Company's  payment  obligations  in this Section
7.07,  the Trustee shall have a lien prior to the Notes on all money or property
held or collected by the  Trustee,  in its capacity as Trustee,  except money or
property  held in trust to pay principal  of,  premium,  if any, and interest on
particular Notes.

                  Without prejudice to any other rights available to the Trustee
under  applicable law, if the Trustee incurs expenses or renders  services after
the occurrence of an Event of Default  specified in clause (g) or (h) of Section
6.01,  the expenses and the  compensation  for the services  will be intended to
constitute  expenses  of  administration  under  Title 11 of the  United  States
Bankruptcy  Code or any  applicable  federal  or  state  law for the  relief  of
debtors.

                  SECTION  7.08.  Replacement  of  Trustee  . A  resignation  or
removal of the  Trustee and  appointment  of a successor  Trustee  shall  become
effective  only  upon the  successor  Trustee's  acceptance  of  appointment  as
provided in this Section 7.08.

                  The Trustee may resign at any time by so notifying the Company
in writing at least 30 days prior to the date of the proposed  resignation.  The
Holders of a majority in principal  amount of the  outstanding  Notes may remove
the Trustee by so  notifying  the Trustee in writing and may appoint a successor
Trustee with the consent of the Company.

                  The  Company  may at any time  remove the  Trustee,  by Issuer
Order given at least 30 days prior to the date of the proposed removal; provided
that at such date no Event of Default shall have occurred and be continuing.

                  Except as  provided in the second  sentence  of the  preceding
paragraph,  if the Trustee resigns or is removed,  or if a vacancy exists in the
office of Trustee for any reason, the Company shall promptly appoint a successor
Trustee.  Within one year after the successor Trustee takes office,  the Holders
of a  majority  in  principal  amount of the  outstanding  Notes  may  appoint a
successor Trustee to replace the successor Trustee appointed by the Company.  If
the


<PAGE>



 successor Trustee does not deliver its written acceptance  required by the next
succeeding  paragraph  of this  Section  7.08 within 30 days after the  retiring
Trustee resigns or is removed,  the retiring Trustee, the Company or the Holders
of a majority in  principal  amount of the  outstanding  Notes may  petition any
court of competent jurisdiction for the appointment of a successor Trustee.

                  A successor Trustee shall deliver a written  acceptance of its
appointment to the retiring  Trustee and to the Company.  Immediately  after the
delivery of such  written  acceptance,  subject to the lien  provided in Section
7.07, (i) the retiring Trustee shall transfer all property held by it as Trustee
to the  successor  Trustee,  (ii) the  resignation  or removal  of the  retiring
Trustee shall become  effective  and (iii) the successor  Trustee shall have all
the rights,  powers and duties of the Trustee under this Indenture.  A successor
Trustee shall mail notice of its succession to each Holder.

                  Subject to Section 6.11, if the Trustee is no longer qualified
or eligible under Section 7.10, any Holder who satisfies the requirements of TIA
Section 310(b) may petition any court of competent  jurisdiction for the removal
of the Trustee and the appointment of a successor Trustee.

                  The  Company  shall  give  notice of any  resignation  and any
removal  of the  Trustee  and each  appointment  of a  successor  Trustee to all
Holders.  Each notice shall  include the name of the  successor  Trustee and the
address of its Corporate Trust Office.

                  Notwithstanding  replacement  of the Trustee  pursuant to this
Section  7.08,  the  Company's  obligations  under  Section 7.07 shall  continue
indefinitely for the benefit of the retiring Trustee.

                  SECTION 7.09. Successor Trustee by Merger, Etc. If the Trustee
consolidates  with,  merges or converts into, or transfers all or  substantially
all of its corporate trust business to, another  corporation or national banking
association,  the  resulting,  surviving or transferee  corporation  or national
banking  association without any further act shall be the successor Trustee with
the same  effect  as if the  successor  Trustee  had been  named as the  Trustee
herein.

                  SECTION 7.10. Eligibility . This Indenture shall always have a
Trustee that satisfies the  requirements  of TIA Section  310(a)(1) and (5). The
Trustee shall have a combined  capital and surplus of at least  $100,000,000  as
set forth in its most recent published  annual report of condition.  The Trustee
shall be subject to TIA Section  310(b),  subject to the  penultimate  paragraph
thereof.

                  SECTION  7.11.  Money Held in Trust . The Trustee shall not be
liable for interest on any money  received by it except as the Trustee may agree
in writing  with the  Company.  Money held in trust by the  Trustee  need not be
segregated from other funds except to the extent required by law, and except for
money held in trust under Article Eight of this Indenture.


<PAGE>





                  SECTION 7.12.  Withholding  Taxes . The Trustee,  as agent for
the  Company,  shall  exclude and withhold  from each  payment of principal  and
interest  and other  amounts due  hereunder  or under the Notes any and all U.S.
withholding  taxes applicable  thereto as required by law. The Trustee agrees to
act as such withholding agent and, in connection therewith, whenever any present
or future taxes or similar  charges are required to be withheld  with respect to
any amounts payable in respect of the Notes, to withhold such amounts and timely
pay the same to the  appropriate  authority  in the name of and on behalf of the
Holders of the Notes, that it will file any necessary withholding tax returns or
statements  when due,  and that,  as  promptly  as  possible  after the  payment
thereof,  it will  deliver to each  Holder of a Note  appropriate  documentation
showing the payment thereof,  together with such additional documentary evidence
as such Holders may reasonably request from time to time.


                                  ARTICLE EIGHT
                             DISCHARGE OF INDENTURE

                  SECTION 8.01. Termination of Company's Obligations . Except as
otherwise  provided in this Section 8.01,  each of the Company may terminate its
obligations under the Notes and this Indenture if:

                  (a) all Notes  previously  authenticated  and delivered (other
         than  destroyed,  lost or stolen Notes that have been replaced or Notes
         for whose  payment money or securities  have  theretofore  been held in
         trust and  thereafter  repaid to the  Company,  as  provided in Section
         8.05) have been  delivered  to the  Trustee  for  cancellation  and the
         Company has paid all sums payable by it hereunder; or

                  (b) (i) all such Notes  mature  within one year or all of them
         are to be called for  redemption  within  one year  under  arrangements
         satisfactory  to the Trustee for giving the notice of redemption,  (ii)
         the Company irrevocably  deposits in trust with the Trustee during such
         one-year period,  under the terms of an irrevocable  trust agreement in
         form satisfactory to the Trustee, as trust funds solely for the benefit
         of the Holders of such Notes for that purpose, money or U.S. Government
         Obligations  sufficient (in the opinion of a nationally recognized firm
         of independent public accountants  expressed in a written certification
         thereof  delivered  to  the  Trustee),  without  consideration  of  any
         reinvestment of any interest thereon,  to pay Accreted Value,  premium,
         if any,  and interest on such Notes to maturity or  redemption,  as the
         case may be, and to pay all other sums payable by it  hereunder,  (iii)
         no  Default or Event of Default  with  respect to the Notes  shall have
         occurred  and be  continuing  on the date of such  deposit,  (iv)  such
         deposit  will not result in a breach or violation  of, or  constitute a
         default under,  this Indenture or any other  agreement or instrument to
         which the  Company is a party or by which it is bound [, (v) if at such
         time the Notes are listed on a national securities exchange,  the Notes
         will  not be  delisted  as a result  of such  deposit,  defeasance  and
         discharge,] [and] [(v)] [(vi)] the Company has delivered to the Trustee
         an  Officers'  Certificate  and an  Opinion  of  Counsel,  in each case
         stating that all conditions  precedent  provided for herein relating to
         the  satisfaction  and discharge of this  Indenture  have been complied
         with.


<PAGE>





                  With  respect  to the  foregoing  clause  (a),  the  Company's
obligations  under  Section 7.07 shall  survive.  With respect to the  foregoing
clause (b), the Company's  obligations in Sections 2.02, 2.03, 2.04, 2.05, 2.06,
2.07,  2.08,  2.09,  2.14,  4.01,  4.02,  7.07,  7.08, 8.04, 8.05 and 8.06 shall
survive until the Notes have matured or have been redeemed. Thereafter, only the
Company's  obligations in Sections 7.07, 8.05 and 8.06 shall survive.  After any
such irrevocable  deposit, the Trustee upon request shall acknowledge in writing
the discharge of the Company's  obligations  under the Notes and this Indenture,
and the Guarantor's  obligations under the Guarantee and this Indenture,  except
for those surviving obligations specified above.

         SECTION 8.02.  Defeasance and Discharge of Indenture.  The Company will
be deemed to have paid and will be discharged  from any and all  obligations  in
respect of the Notes on the 123rd day after the date of the deposit  referred to
in clause (a) of this Section 8.02 if:

                  (a) with  reference  to this  Section  8.02,  the  Company has
         irrevocably  deposited or caused to be  irrevocably  deposited with the
         Trustee and has conveyed all right,  title and interest for the benefit
         of the Holders,  under the terms of an irrevocable  trust  agreement in
         form satisfactory to the Trustee as trust funds in trust,  specifically
         pledged to the Trustee  for the benefit of the Holders as security  for
         payment of the Accreted  Value of,  premium,  if any, and interest,  if
         any, on the Notes, and dedicated solely to, the benefit of the Holders,
         in and to (i)  money in an  amount,  (ii) U.S.  Government  Obligations
         that,  through the payment of interest,  premium,  if any, and Accreted
         Value in respect thereof in accordance with their terms,  will provide,
         not later than one day before the due date of any  payment  referred to
         in this clause (a),  money in an amount or (iii) a combination  thereof
         in an amount sufficient, in the opinion of a nationally recognized firm
         of independent public accountants  expressed in a written certification
         thereof  delivered  to the  Trustee,  to  pay  and  discharge,  without
         consideration of the reinvestment of such interest and after payment of
         all federal,  state and local taxes or other charges and assessments in
         respect thereof payable by the Trustee, the Accreted Value of, premium,
         if any,  and accrued  interest on the  outstanding  Notes at the Stated
         Maturity of such Accreted Value or interest or upon earlier redemption;
         provided  that the Trustee  shall have been  irrevocably  instructed to
         apply such money or the proceeds of such U.S. Government Obligations to
         the payment of such Accreted Value,  premium, if any, and interest with
         respect to the Notes and to give any related notice of redemption;

                  (b) such deposit will not result in a breach or violation  of,
         or constitute a default under, this Indenture or any other agreement or
         instrument to which the Company or any of its  Subsidiaries  is a party
         or by which the Company or any of its Subsidiaries is bound;

                  (c)  immediately  after giving effect to such deposit on a pro
         forma  basis,  no Default or Event of Default,  or event that after the
         giving  of notice or lapse of time or both  could  become a Default  or
         Event of Default,  shall have occurred and be continuing on the date of
         such  deposit or during  the  period  ending on the 123rd day after the
         date of such deposit;


<PAGE>





                  (d) the Company shall have delivered to the Trustee (i) either
         (A) a ruling directed to the Trustee received from the Internal Revenue
         Service to the effect that the Holders  will not  recognize  additional
         income, gain or loss for federal income tax purposes as a result of the
         Company's  exercise of its option  under this  Section 8.02 and will be
         subject to federal income tax on the same amount and in the same manner
         and at the same  times as would  have been the case if such  option had
         not been  exercised  or (B) an Opinion of Counsel to the same effect as
         the ruling  described  in clause (A) above  accompanied  by a ruling to
         that effect published by the Internal Revenue Service, unless there has
         been a change in the  applicable  federal income tax law since the date
         of this Indenture such that a ruling from the Internal  Revenue Service
         is no longer required and (ii) an Opinion of Counsel to the effect that
         (A)  the  creation  of  the  defeasance  trust  does  not  violate  the
         Investment  Company  Act of 1940 and (B) after the  passage of 123 days
         following the deposit (except,  with respect to any trust funds for the
         account  of any  Holder  who may be deemed to be  "connected"  with the
         Company  for  purposes  of the  Insolvency  Act 1986  after  two  years
         following  the  deposit),  the trust  funds  will not be subject to the
         effect of Section 547 of the United States  Bankruptcy  Code or Section
         15 of the New York  Debtor  and  Creditor  Law and either (I) the trust
         funds will no longer remain the property of the Company (and  therefore
         will  not be  subject  to the  effect  of  any  applicable  bankruptcy,
         insolvency,  reorganization or similar laws affecting creditors' rights
         generally)  or (II) if a court  were to rule  under any such law in any
         case or  proceeding  that the  trust  funds  remained  property  of the
         Company (a) assuming such trust funds remained in the possession of the
         Trustee  prior  to such  court  ruling  to the  extent  not paid to the
         Holders, the Trustee will hold, for the benefit of the Holders, a valid
         and  perfected  security  interest  in  such  trust  funds  that is not
         avoidable in  bankruptcy  or otherwise  and (b) no property,  rights in
         property  or other  interests  granted to the Trustee or the Holders in
         exchange  for, or with  respect to, such trust funds will be subject to
         any prior rights of holders of other Indebtedness of the Company or any
         of its Notes;

                  (e) if at  such  time  the  Notes  are  listed  on a  national
         securities exchange, the Company shall have delivered to the Trustee an
         Opinion of Counsel to the effect that the Notes will not be delisted as
         a result of the  Company's  exercise of its opinion  under this Section
         8.02; and

                  (f)  the  Company  shall  have  delivered  to the  Trustee  an
         Officers'  Certificate and an Opinion of Counsel,  in each case stating
         that all  conditions  precedent  provided  for herein  relating  to the
         defeasance contemplated by this Section 8.02 have been complied with.

                  Notwithstanding  the  foregoing,  prior to the end of the post
deposit period  referred to in clause  (d)(ii)(B) of this Section 8.02,  none of
the Company's  obligations under this Indenture shall be discharged.  Subsequent
to the end of such period  with  respect to this  Section  8.02,  the  Company's
obligations in Sections 2.02,  2.03,  2.04,  2.05, 2.06, 2.07, 2.08, 2.09, 2.14,
4.01, 4.02, 7.07, 7.08, 8.04, 8.05 and 8.06 shall survive until the Notes mature
or are redeemed.  Thereafter,  only the Company's  obligations in Sections 7.07,
8.05 and 8.06 shall  survive.  If and when a ruling  from the  Internal  Revenue
Service or an Opinion of Counsel


<PAGE>



 referred to in clause (d)(i) of this Section 8.02 may be provided  specifically
without regard to, and not in reliance  upon,  the  continuance of the Company's
obligations  under  the first  sentence  of  Section  4.01,  then the  Company's
obligations under such sentence shall cease upon delivery to the Trustee of such
ruling or Opinion of Counsel and compliance with the other conditions  precedent
provided  for herein  relating to the  defeasance  contemplated  by this Section
8.02.

                  After any such irrevocable  deposit,  the Trustee upon request
shall  acknowledge in writing the discharge of the Company's  obligations  under
the Notes, any Subsidiary Guarantee, if any, and this Indenture except for those
surviving obligations in the immediately preceding paragraph.

                  SECTION 8.03.  Defeasance of Certain Obligations . The Company
may omit to comply with any term,  provision or  condition  set forth in clauses
(iii) and (iv) of Section  5.01 and  Sections  4.03 through 4.17 (except for any
covenant otherwise required by the TIA), and clauses (c) and (d) of Section 6.01
with respect to clauses  (iii) and (iv) of Section  5.01,  clause (e) of Section
6.01 with respect to Sections 4.03 through 4.17, except as aforesaid, and clause
(f) of Section  6.01 shall be deemed not to be Events of  Default,  in each case
with respect to the outstanding Notes if:

                  (a) with  reference  to this  Section  8.03,  the  Company has
         irrevocably  deposited or caused to be  irrevocably  deposited with the
         Trustee and conveyed  all right,  title and interest to the Trustee for
         the benefit of the  Holders,  under the terms of an  irrevocable  trust
         agreement in form and  substance  satisfactory  to the Trustee as trust
         funds in trust,  specifically pledged to the Trustee for the benefit of
         the Holders as security for payment of the Accreted Value of,  premium,
         if any, and interest,  if any, on the Notes,  and dedicated  solely to,
         the benefit of the Holders, in and to (i) money in an amount, (ii) U.S.
         Government  Obligations  that,  through  the  payment of  interest  and
         Accreted Value in respect thereof in accordance with their terms,  will
         provide,  not later  than one day  before  the due date of any  payment
         referred  to in  this  clause  (a),  money  in an  amount  or  (iii)  a
         combination  thereof  in an  amount  sufficient,  in the  opinion  of a
         nationally  recognized firm of independent public accountants expressed
         in a written certification thereof delivered to the Trustee, to pay and
         discharge,  without  consideration of the reinvestment of such interest
         and after  payment  of all  federal,  state  and  local  taxes or other
         charges and assessments in respect thereof payable by the Trustee,  the
         Accreted  Value of,  premium,  if any, and interest on the  outstanding
         Notes  on the  Stated  Maturity  or  upon  earlier  redemption  of such
         Accreted  Value or interest;  provided that the Trustee shall have been
         irrevocably instructed to apply such money or the proceeds of such U.S.
         Government  Obligations to the payment of such Accreted Value, premium,
         if any, and interest  with respect to the Notes and to give any related
         notice of redemption;

                  (b) such deposit will not result in a breach or violation  of,
         or constitute a default under, this Indenture or any other agreement or
         instrument to which the Company or any of its  Subsidiaries  is a party
         or by which the Company or any of its Subsidiaries is bound;


<PAGE>





                  (c)  immediately  after giving effect to such deposit or a pro
         forma  basis,  no Default or Event of Default,  or event that after the
         giving  of notice or lapse of time or both  would  become a Default  or
         Event of Default,  shall have occurred and be continuing on the date of
         such deposit or during the period ending on the 123rd day after the day
         of such deposit;

                  (d) the  Company  has  delivered  to the Trustee an Opinion of
         Counsel to the effect  that (i) the  creation of the  defeasance  trust
         does not violate the Investment  Company Act of 1940,  (ii) the Holders
         will not recognize income, gain or loss for federal income tax purposes
         as a result  of such  deposit  and the  defeasance  of the  obligations
         referred to in the first  paragraph  of this  Section  8.03 and will be
         subject to federal income tax on the same amount and in the same manner
         and at the same times as would have been the case if such  deposit  and
         defeasance  had not  occurred  and (iii)  after the passage of 123 days
         following  the deposit  (except with respect to any trust funds for the
         account  of any  Holder  who may be deemed to be  "connected"  with the
         Company  for  purposes  of the  Insolvency  Act 1986  after  two  years
         following  the  deposit),  the trust  funds  will not be subject to the
         effect of Section 547 of the United States  Bankruptcy  Code or Section
         15 of the New York Debtor and  Creditor  Law,  and either (A) the trust
         funds will no longer remain the property of the Company (and  therefore
         will  not be  subject  to the  effect  of  any  applicable  bankruptcy,
         insolvency,  reorganization or similar laws affecting creditor's rights
         generally)  or (B) if a court  were to rule  under  any such law in any
         case or  proceeding  that the  trust  funds  remained  property  of the
         Company (1) assuming such trust funds remained in the possession of the
         Trustee  prior  to such  court  ruling  to the  extent  not paid to the
         Holders, the Trustee will hold, for the benefit of the Holders, a valid
         and  perfected  security  interest  in  such  trust  funds  that is not
         avoidable in  bankruptcy  or otherwise  and (2) no property,  rights in
         property  or other  interests  granted to the Trustee or the Holders in
         exchange  for, or with  respect to, such trust funds will be subject to
         any prior rights or holders of other Indebtedness of the Company or any
         of its Notes;

                  (e) if at  such  time  the  Notes  are  listed  on a  national
         securities  exchange,  the  Company  has  delivered  to the  Trustee an
         Opinion of Counsel to the effect that the Notes will not be delisted as
         a result of the  Company's  exercise of its option under  Section 8.03;
         and

                  (f) the Company  has  delivered  to the  Trustee an  Officers'
         Certificate  and an Opinion of Counsel,  in each case  stating that all
         conditions  precedent  provided for herein  relating to the  defeasance
         contemplated by this Section 8.03 have been complied with.

                  SECTION 8.04.  Application of Trust Money.  Subject to Section
8.06,  the Trustee or Paying Agent shall hold in trust money or U.S.  Government
Obligations  deposited  with it pursuant to Section  8.01,  8.02 or 8.03, as the
case may be,  and shall  apply  the  deposited  money  and the  money  from U.S.
Government  Obligations  in accordance  with the Notes and this Indenture to the
payment of Accreted Value of,  premium,  if any, and interest on the Notes;  but
such money need not be segregated from other funds except to the extent required
by law.


<PAGE>





                  SECTION 8.05. Repayment to Company . Subject to Sections 7.07,
8.01,  8.02 and 8.03, the Trustee and the Paying Agent shall promptly pay to the
Company upon request set forth in an Officers' Certificate any excess money held
by them at any time and  thereupon  shall be relieved  from all  liability  with
respect to such money. The Trustee and the Paying Agent shall pay to the Company
any money held by them for the payment of Accreted  Value,  premium,  if any, or
interest that remains unclaimed for two years; provided that the Trustee or such
Paying Agent before being required to make any payment may cause to be published
at the expense of the Company once in a newspaper of general  circulation in the
City of New York or mail to each Holder  entitled to such money notice that such
money remains  unclaimed and that after a date specified therein (which shall be
at least 30 days from the date of such  publication  or mailing)  any  unclaimed
balance  of such  money  then  remaining  will be repaid to the  Company.  After
payment to the Company,  Holders entitled to such money must look to the Company
for payment as general  creditors  unless an applicable law  designates  another
Person,  and all  liability of the Trustee and such Paying Agent with respect to
such money shall cease.

                  SECTION 8.06.  Reinstatement  . If the Trustee or Paying Agent
is unable to apply any money or U.S.  Government  Obligations in accordance with
Section  8.01,  8.02 or  8.03,  as the  case  may be,  by  reason  of any  legal
proceeding  or by reason of any order or judgment  of any court or  governmental
authority enjoining,  restraining or otherwise prohibiting such application, the
Company's obligations under this Indenture,  the Guarantee,  and the Notes shall
be revived and reinstated as though no deposit had occurred  pursuant to Section
8.01, 8.02 or 8.03, as the case may be, until such time as the Trustee or Paying
Agent is permitted  to apply all such money or U.S.  Government  Obligations  in
accordance  with Section 8.01,  8.02 or 8.03, as the case may be; provided that,
if the Company has made any payment of Accreted  Value of,  premium,  if any, or
interest  on any Notes  because of the  reinstatement  of its  obligations,  the
Company  shall be  subrogated  to the  rights of the  Holders  of such  Notes to
receive such payment from the money or U.S.  Government  Obligations held by the
Trustee or Paying Agent.


                                          ARTICLE NINE
                               AMENDMENTS, SUPPLEMENTS AND WAIVERS

                  SECTION 9.01.  Without Consent of Holders . The Company,  when
authorized by Board  Resolution,  and the Trustee may amend or  supplement  this
Indenture, and the Notes without notice to, or the consent of, any Holder:

                  (a) to cure any  ambiguity,  defect or  inconsistency  in this
         Indenture;  provided  that such  amendments  or  supplements  shall not
         adversely affect the interests of the Holders in any material respect;

                  (b)      to comply with Article Five;

                  (c) to add to the  covenants of the Company for the benefit of
         the Holders or to surrender  any right or power herein  conferred  upon
         the Company; or


<PAGE>



;

                  (d) to evidence and provide for the  acceptance of appointment
         hereunder by a successor Trustee with respect to the Notes;

                  (e)      to add any additional Events of Default; or

                  (f)      to add a Guarantor.

                  SECTION  9.02.  With  Consent of Holders . Subject to Sections
6.04 and 6.07 and  without  prior  notice  to the  Holders,  the  Company,  when
authorized by its Board of Directors (as evidenced by a Board  Resolution),  and
the  Trustee  may amend this  Indenture  and the Notes  with the  consent of the
Holders of not less than a majority in aggregate principal amount at maturity of
the Notes then outstanding.

                  Notwithstanding  the provisions of this Section 9.02,  without
the consent of each Holder affected, an amendment or waiver,  including a waiver
pursuant to Section 6.04, may not:


                  (i) change the Stated  Maturity of the  principal  at maturity
         of, or any installment of interest on, any Note;

                  (ii)  reduce the  Accreted  Value of, or  premium,  if any, or
         interest on, any Note;

                  (iii)  change the place or currency of payment of principal at
         maturity of, or premium, if any, or interest on, any Note;

                  (iv) impair the right to institute suit for the enforcement of
         any  payment  on or after the  Stated  Maturity  (or,  in the case of a
         redemption, on or after the Redemption Date) of any Note;

                  (v) reduce the  above-stated  percentage of outstanding  Notes
         the  consent  of whose  Holders  is  necessary  to  modify or amend the
         Indenture;

                  (vi) waive a default in the payment of  principal  at maturity
         of, premium, if any, or interest on the Notes;

                  (vii) reduce the percentage or aggregate principal at maturity
         amount at maturity of outstanding Notes the consent of whose Holders is
         necessary  for waiver of  compliance  with  certain  provisions  of the
         Indenture or for waiver of certain defaults; or

                  (viii)   release the Guarantors from their Note Guarantees.

                  It shall not be necessary for the consent of the Holders under
this Section  9.02 to approve the  particular  form of any  proposed  amendment,
supplement or waiver,  but it shall be  sufficient if such consent  approves the
substance thereof.


<PAGE>





                  After an  amendment,  supplement  or waiver under this Section
9.02 becomes effective, the Company shall mail to the Holders affected thereby a
notice briefly describing such amendment, supplement or waiver. The Company will
mail supplemental indentures to Holders upon request. Any failure of the Company
to mail such  notice,  or any defect  therein,  shall not,  however,  in any way
impair or affect the validity of any such supplemental indenture or waiver.

                  SECTION  9.03.  Revocation  and  Effect of  Consent . Until an
amendment  or  waiver  becomes  effective,  a  consent  to it by a  Holder  is a
continuing  consent  by the  Holder  and  every  subsequent  Holder of a Note or
portion  of a Note that  evidences  the same debt as the Note of the  consenting
Holder,  even if notation of the consent is not made on any Note.  However,  any
such  Holder or  subsequent  Holder  may  revoke  the  consent as to its Note or
portion of its Note.  Such  revocation  shall be  effective  only if the Trustee
receives the notice of revocation before the date any such amendment, supplement
or waiver  becomes  effective.  An amendment,  supplement or waiver shall become
effective on receipt by the Trustee of written  consents from the Holders of the
requisite percentage in principal amount of the outstanding Notes.

                  The Company may,  but shall not be obligated  to, fix a record
date for the purpose of determining the Holders of  Certificated  Notes entitled
to consent to any  amendment,  supplement or waiver.  If a record date is fixed,
then,  notwithstanding  the  last two  sentences  of the  immediately  preceding
paragraph,  those persons who were Holders of Certificated  Notes at such record
date (or their duly designated proxies) and only those persons shall be entitled
to  consent to such  amendment,  supplement  or waiver or to revoke any  consent
previously  given,  whether or not such  persons  continue to be Holders of such
Certificated  Notes after such record date.  No such  consent  shall be valid or
effective for more than 90 days after such record date.

                  After an amendment, supplement or waiver becomes effective, it
shall bind every Holder unless it is of the type described in any of clauses (a)
through  (h) of  Section  9.02.  In case of an  amendment  or waiver of the type
described in clauses (a) through (h) of Section  9.02,  the  amendment or waiver
shall bind each Holder who has consented to it and every subsequent  Holder of a
Note that evidences the same indebtedness as the Note of such consenting Holder.

                  SECTION  9.04.  Notation  on  or  Exchange  of  Notes  . If an
amendment,  supplement  or waiver  changes the terms of a Note,  the Trustee may
require the Holder to deliver such Note to the Trustee. The Trustee may place an
appropriate  notation on the Note about the  changed  terms and return it to the
Holder and the Trustee may place an appropriate  notation on any Note thereafter
authenticated.  Alternatively,  if the Company or the Trustee so determines, the
Company in exchange for the Note shall issue and the Trustee shall  authenticate
a new Note that reflects the changed terms.

                  SECTION  9.05.  Trustee to Sign  Amendments,  Etc. The Trustee
shall be entitled to receive,  and shall be fully  protected in relying upon, an
Opinion of Counsel  stating that the execution of any  amendment,  supplement or
waiver  authorized  pursuant to this Article Nine is  authorized or permitted by
this  Indenture.  The Trustee  shall execute any such  amendment,  supplement or
waiver upon satisfaction of the conditions precedent thereto contained herein,


<PAGE>



 unless such amendment, supplement or waiver adversely affects the Trustee's own
rights, duties or immunities under this Indenture or otherwise.

                  SECTION  9.06.  Conformity  with Trust  Indenture  Act . Every
supplemental  indenture  executed pursuant to this Article Nine shall conform to
the requirements of the TIA as then in effect.


                                   ARTICLE TEN
                               GUARANTEE OF NOTES

                  SECTION  10.01.  Guarantee . Subject to the provisions of this
Article Eleven,  the Guarantors  hereby fully,  unconditionally  and irrevocably
guarantee  to each Holder and to the Trustee on behalf of the  Holders:  (i) the
due and punctual payment of the Accreted Value of, premium,  if any, and accrued
interest  on each  Note,  when and as the same  shall  become  due and  payable,
whether at maturity, by acceleration or otherwise,  the due and punctual payment
of interest on the overdue Accreted Value of and interest, if any, on the Notes,
to the  extent  lawful,  and the  due  and  punctual  performance  of all  other
obligations of the Company to the Holders or the Trustee, all in accordance with
the terms of such Note and this Indenture [and (ii) in the case of any extension
of time of payment  or  renewal  of any Notes or any of such other  obligations,
that the same will be promptly  paid in full when due or performed in accordance
with the terms of the extension or renewal, at Stated Maturity,  by acceleration
or otherwise].  The Guarantor hereby waives  diligence,  presentment,  demand of
payment,  filing of claims with a court in the event of merger or  bankruptcy of
the Company,  any right to require a proceeding  first against the Company,  the
benefit of  discussion,  protest or notice with  respect to any such Note or the
debt  evidenced  thereby and all demands  whatsoever,  and  covenants  that this
Guarantee  will not be  discharged as to any such Note except by payment in full
of the  principal  thereof and interest  thereon and as provided in Section 8.01
and Section 8.02  (subject to Section  8.06).  The  maturity of the  obligations
guaranteed hereby may be accelerated as provided in Article Six for the purposes
of this Article Eleven.  In the event of any declaration of acceleration of such
obligations as provided in Article Six, such obligations (whether or not due and
payable) shall forthwith become due and payable by the Guarantor for the purpose
of this Article Eleven. In addition,  without limiting the foregoing provisions,
upon the  effectiveness of an acceleration  under Article Six, the Trustee shall
promptly make a demand for payment on the Notes under the Guarantee provided for
in this Article Eleven.

                  If the  Trustee or the Holder of any Note is  required  by any
court or otherwise to return to the Company or the Guarantor,  or any custodian,
receiver, liquidator,  trustee, sequestrator or other similar official acting in
relation to the Company or the Guarantor, any amount paid to the Trustee or such
Holder  in  respect  of a  Note,  this  Guarantee,  to  the  extent  theretofore
discharged,  shall be reinstated in full force and effect. The Guarantor further
agrees,  to the fullest  extent that it may lawfully do so, that, as between it,
on the one  hand,  and the  Holders  and the  Trustee,  on the other  hand,  the
maturity of the obligations  guaranteed hereby may be accelerated as provided in
Article Six hereof for the purposes of this Guarantee,


<PAGE>



notwithstanding  any stay,  injunction  or other  prohibition  extant  under any
applicable  bankruptcy  law  preventing  such  acceleration  in  respect  of the
obligations guaranteed hereby.

                  The  Guarantor  hereby  irrevocably  waives any claim or other
rights which it may now or hereafter acquire against the Company that arise from
the existence, payment, performance or enforcement of its obligations under this
Guarantee  and this  Indenture,  including,  without  limitation,  any  right of
subrogation,  reimbursement,  exoneration,  contribution,  indemnification,  any
right to participate  in any claim or remedy of the Holders  against the Company
or any collateral  which any such Holder or the Trustee on behalf of such Holder
hereafter acquires, whether or not such claim, remedy or right arises in equity,
or under contract,  statute or common law, including,  without  limitation,  the
right to take or receive from the Company,  directly or  indirectly,  in cash or
other  property  or by set-off or in any other  manner,  payment or  security on
account  of such  claim  or other  rights.  If any  amount  shall be paid to the
Guarantor  in  violation of the  preceding  sentence and the Accreted  Value of,
premium,  if any, and accrued  interest on the Notes shall not have been paid in
full,  such amount  shall be deemed to have been paid to the  Guarantor  for the
benefit  of,  and held in trust  for the  benefit  of,  the  Holders,  and shall
forthwith  be paid to the  Trustee for the benefit of the Holders to be credited
and applied upon the Accreted Value of, premium, if any, and accrued interest on
the Notes. The Guarantor  acknowledges  that it will receive direct and indirect
benefits from the issuance of the Notes  pursuant to this Indenture and that the
waivers set forth in this Section 10.01 are knowingly made in  contemplation  of
such benefits.

                  The  Guarantee  set forth in this  Section  10.01 shall not be
valid or become  obligatory  for any  purpose  with  respect to a Note until the
certificate  of  authentication  on such Note  shall  have been  signed by or on
behalf of the Trustee.

                  SECTION 10.02. Obligations  Unconditional . Subject to Section
10.05,  nothing  contained in this Article Eleven or elsewhere in this Indenture
or in the Notes is intended to or shall  impair,  as among the Guarantor and the
holders of the Notes,  the  obligation of the  Guarantor,  which is absolute and
unconditional,  upon failure by the Company,  to pay to the holders of the Notes
the Accreted  Value of,  premium,  if any, and interest on the Notes as and when
the same shall  become due and payable in  accordance  with their  terms,  or is
intended to or shall affect the relative  rights of the holders of the Notes and
creditors of the  Guarantor,  nor shall anything  herein or therein  prevent the
holder of any Notes or the Trustee on their behalf from  exercising all remedies
otherwise permitted by applicable law upon default under this Indenture.

                  Without  limiting  the  foregoing,  nothing  contained in this
Article  Eleven  will  restrict  the right of the  Trustee or the holders of the
Notes to take any action to declare the Guarantee to be due and payable prior to
the Stated  Maturity  of the Notes  pursuant  to  Section  6.02 or to pursue any
rights or remedies hereunder.

                  SECTION  10.03.  Notice to Trustee . The Guarantor  shall give
prompt  written  notice to the Trustee of any fact known to the Guarantor  which
would prohibit the making of


<PAGE>



any  payment to or by the  Trustee in respect of the  Guarantee  pursuant to the
provisions of this Article Eleven.

                  SECTION 10.04. This Article Not to Prevent Events of Default .
The failure to make a payment on account of Accreted Value of, premium,  if any,
or accrued interest on the Notes by reason of any provision of this Article will
not be construed as preventing the occurrence of an Event of Default.

                  SECTION  10.05.  Net Worth  Limitation .  Notwithstanding  any
other  provision of this  Indenture  or the Notes,  the  Guarantee  shall not be
enforceable against the Guarantor in an amount in excess of the net worth of the
Guarantor at the time that  determination of such net worth is, under applicable
law,  relevant  to the  enforceability  of the  Guarantee.  Such net worth shall
include any claim of the Guarantor against the Company for reimbursement and any
claim against any grantor of a Guarantee for contribution.


                                 ARTICLE ELEVEN
                                  MISCELLANEOUS

                  SECTION  11.01.  Trust  Indenture Act of 1939 . This Indenture
shall be subject to the  provisions of the TIA that are required to be a part of
this  Indenture  and  shall,  to the  extent  applicable,  be  governed  by such
provisions.


                  SECTION 11.02.  Notices . Any notice or communication shall be
sufficiently  given if in  writing  and  delivered  in person or mailed by first
class mail or telecopier  communication,  addressed as follows,  and received by
the addressee:

             if to the Company:

                      Orion Newco Services, Inc.
                      2440 Research Boulevard
                      Suite 40
                      Rockville, Maryland 20850
                      Telecopier No: (301) 258-8101
                      Attention:  [________]

             with a copy to:

                      Hogan & Hartson, L.L.P.
                      Columbia Square
                      555 Thirteenth Street, N.W.
                      Washington, D.C. 20004
                      Telecopier No.:  (202) 637-5910
                      Attention:  [________]


<PAGE>






             if to the Trustee:

                      Bankers Trust Company
                      4 Albany Street
                      Mailstop 5041
                      New York, N.Y.  10006
                      Telecopier No.:  (212) 250-6392
                      Attention:  Corporate Trustee Administration Department

             with a copy to:

                      Leboeuf, Lamb, Greene & MacRae, L.L.P.
                      125 West 55th Street
                      New York,  N.Y.  10019
                      Telecopier No.:  (212) 424-8500
                      Attention:  Joan Monahan

                  The Company,  the Trustee or the  Depositary  by notice to the
other may designate  additional or different addresses for subsequent notices or
communications.

                  Any  notice  or   communication   mailed  to  a  Holder  of  a
Certificated  Note  shall be mailed to him at his  address  as it appears on the
Register by first class mail and shall be sufficiently given to him if so mailed
within  the time  prescribed.  Copies of any such  communication  or notice to a
Holder shall also be mailed to the Trustee and each Agent at the same time.

                  Failure  to mail a notice  or  communication  to a  Holder  as
provided  herein or any  defect  in it shall not  affect  its  sufficiency  with
respect to other  Holders.  Except for a notice to the Trustee,  which is deemed
given only when received, and except as otherwise provided in this Indenture, if
a notice or  communication  is mailed in the  manner  provided  in this  Section
11.02, it is duly given, whether or not the addressee receives it.

                  Where this Indenture  provides for notice in any manner,  such
notice may be waived in writing by the Person  entitled to receive  such notice,
either  before or after the event,  and such waiver shall be the  equivalent  of
such notice.  Waivers of notice by Holders shall be filed with the Trustee,  but
such filing  shall not be a condition  precedent  to the  validity of any action
taken in reliance upon such waiver.

                  In case by reason of the suspension of regular mail service or
by reason of any other  cause it shall be  impracticable  to give such notice by
mail,  then such  notification as shall be made with the approval of the Trustee
shall constitute a sufficient notification for every purpose hereunder.



<PAGE>




                  SECTION  11.03.  Certificate  and  Opinion  as  to  Conditions
Precedent  . Upon any  request or  application  by the Company to the Trustee to
take any action under this Indenture, the Company shall furnish to the Trustee:

                  (a) an Officers'  Certificate  stating that, in the opinion of
         the signers,  all conditions  precedent,  if any,  provided for in this
         Indenture relating to the proposed action have been complied with; and

                  (b) an Opinion of Counsel stating that, in the opinion of such
         counsel, all such conditions precedent have been complied with.

                  SECTION 11.04. Statements Required in Certificate or Opinion .
Each  certificate  or opinion  with  respect to  compliance  with a condition or
covenant provided for in this Indenture shall include:

                  (a) a statement that each person  signing such  certificate or
         opinion has read such covenant or condition and the definitions  herein
         relating thereto;

                  (b) a  brief  statement  as to the  nature  and  scope  of the
         examination  or  investigation  upon  which the  statement  or  opinion
         contained in such certificate or opinion is based;

                  (c) a statement  that, in the opinion of each such person,  he
         has made such  examination or  investigation  as is necessary to enable
         him to express an informed  opinion as to whether or not such  covenant
         or condition has been complied with; and

                  (d) a  statement  as to whether or not, in the opinion of each
         such  person,  such  condition  or  covenant  has been  complied  with;
         provided, however, that, with respect to matters of fact, an Opinion of
         Counsel may rely on an Officers'  Certificate or certificates of public
         officials.

                  SECTION  11.05.  Acts of  Holders.  (a) Any  request,  demand,
authorization,  direction,  notice,  consent, waiver or other action provided by
this  Indenture to be given or taken by Holders may be embodied in and evidenced
by one or more instruments of substantially similar tenor signed by such Holders
in  person or by an agent  duly  appointed  in  writing;  and,  except as herein
otherwise  expressly  provided,  such action  shall become  effective  when such
instrument or  instruments  are delivered to the Trustee and, where it is hereby
expressly required, to the Company. Proof of execution of any such instrument or
of a writing  appointing  any such agent shall be sufficient  for any purpose of
this Indenture and  conclusive in favor of the Trustee and the Company,  if made
in the manner provided in this Section 10.05.

                  (b) The ownership of Notes shall be proved by the Register.

                  (c) Any request,  demand,  authorization,  direction,  notice,
consent,  waiver or other  action by the  Holder of any Note  shall  bind  every
future Holder of the same Note or


<PAGE>



the  Holder of every  Note  issued  upon the  transfer  thereof  or in  exchange
therefor or in lieu thereof, in respect of anything done, suffered or omitted to
be done by the  Trustee,  any Paying  Agent or the Company in reliance  thereon,
whether or not notation of such action is made upon such Note.

                  (d) If the Company shall solicit from the Holders any request,
demand,  authorization,  direction,  notice,  consent,  waiver of other act, the
Company may, at its option, by or pursuant to a Board Resolution, fix in advance
a record  date for the  determination  of such  Holders  entitled  to give  such
request, demand, authorization, direction, notice, consent, waiver or other act,
but  the  Company  shall  have no  obligation  to do so.  Notwithstanding  Trust
Indenture  Act  Section  316(c),  any such  record date shall be the record date
specified  in or  pursuant to such Board  Resolution,  which shall be a date not
more than 30 days  prior to the  first  solicitation  of  Holders  generally  in
connection therewith and no later than the date such solicitation is completed.

                  If  such  a  record  date  is  fixed,  such  request,  demand,
authorization,  direction,  notice,  consent,  waiver  or other act may be given
before or after such record date, but only the Holders of record at the close of
business  on such  record  date shall be deemed to be Holders  for  purposes  of
determining   whether  Holders  of  the  requisite   proportion  of  Notes  then
outstanding  have  authorized  or agreed or consented to such  request,  demand,
authorization,  direction,  notice,  consent,  waiver or other act, and for this
purpose the Notes then  outstanding  shall be  computed as of such record  date;
provided  that  no  such  request,  demand,  authorization,  direction,  notice,
consent,  waiver or other act by the Holders on such record date shall be deemed
effective  unless it shall become  effective  pursuant to the provisions of this
Indenture not later than six months after the record date.

                  SECTION  11.06.  Rules by Trustee,  Paying Agent or Registrar.
The Trustee may make reasonable  rules for action by or at a meeting of Holders.
The Paying Agent or Registrar may make reasonable rules for its functions.

                  SECTION 11.07. Agent for Service;  Submission to Jurisdiction;
Waiver of Immunities . By the execution and delivery of this Indenture,  each of
the  Company and the  Guarantor  (i)  acknowledges  that it has  designated  and
appointed [ ], as its  authorized  agent upon which process may be served in any
suit,  action or  proceeding  arising  out of or  relating  to the Notes or this
Indenture  that may be  instituted in any federal or state court in the State of
New York,  Borough of Manhattan,  or brought  under federal or state  securities
laws or brought by the  Trustee  (whether in its  individual  capacity or in its
capacity as Trustee  hereunder),  and  acknowledges  that [ ] has accepted  such
designation, (ii) submits to the non-exclusive jurisdiction of any such court in
any such suit,  action or  proceeding,  and (iii) agrees that service of process
upon [ ] and written notice of said service to the Company  (mailed or delivered
to its General  Counsel at its principal  office as specified in Section  11.02)
shall be deemed in every  respect  effective  service of process  upon it in any
such suit or proceeding.  The Company further agrees to take any and all action,
including the execution and filing of any and all such documents and instruments
as may be necessary to


<PAGE>



continue such  designation  and  appointment  of [ ] in full force and effect so
long as this  Indenture  shall be in full  force and  effect or any of the Notes
shall be outstanding.

                  To the extent that the Company  has or  hereafter  may acquire
any immunity from  jurisdiction of any court or from any legal process  (whether
through service of notice,  attachment  prior to judgment,  attachment in aid of
execution,  execution or otherwise) with respect to itself or its property,  the
Company hereby  irrevocably  waives such immunity in respect of its  obligations
under this Indenture and the Notes, to the extent permitted by law.

                  SECTION  11.08.  Payment Date Other Than a Business Day. If an
Interest Payment Date,  Redemption Date,  Payment Date or Stated Maturity of any
Note shall not be a Business Day, then payment of Accreted Value of, premium, if
any,  or  interest  on such Note,  as the case may be,  need not be made on such
date,  but may be made on the next  succeeding  Business Day with the same force
and effect as if made on the Interest  Payment Date,  Payment Date or Redemption
Date, or at the Stated  Maturity of such Note,  provided that no interest  shall
accrue for the period from and after such Interest  Payment Date,  Payment Date,
Redemption Date or Stated Maturity, as the case may be.

                  SECTION  11.09.  Governing Law . This  Indenture and the Notes
shall be  governed  by the  laws of the  State  of New  York  excluding  (to the
greatest  extent  permissible  by law)  any  rule of law that  would  cause  the
application of the laws of any jurisdiction other than the State of New York.

                  SECTION 11.10. No Adverse  Interpretation of Other Agreements.
This  Indenture  may not be used to interpret  another  indenture,  loan or debt
agreement of the Company or any Subsidiary of the Company.  Any such  indenture,
loan or debt agreement may not be used to interpret this Indenture.

                  SECTION 11.10. No Recourse Against Others. No recourse for the
payment of the  Accreted  Value of,  premium,  if any, or interest on any of the
Notes,  or for any claim based thereon or otherwise in respect  thereof,  and no
recourse  under or upon any  obligation,  covenant or  agreement  of the Company
contained in this  Indenture or in any of the Notes,  or because of the creation
of any Indebtedness  represented thereby, shall be had against any incorporator,
stockholder,  officer, director, employee or controlling person, as such, of the
Company or the Guarantor or of any successor Person thereof,  either directly or
through  the  Company  or  any  successor  Person,  whether  by  virtue  of  any
constitution, statute or rule of law, or by the enforcement of any assessment or
penalty or otherwise;  it being expressly  understood that all such liability is
hereby  expressly  waived and released as a condition of, and as a consideration
for, the execution of this Indenture and the issue of the Notes.

                  SECTION  11.11.  Successors . All agreements of the Company in
this  Indenture and the Notes shall bind its  successors.  All agreements of the
Trustee in this Indenture shall bind its successors.


<PAGE>





                  SECTION 11.12.  Duplicate Originals.  The parties may sign any
number of copies of this Indenture.  Each signed copy shall be an original,  but
all of them together represent the same agreement.

                  SECTION  11.13.  Separability.  In case any  provision in this
Indenture  or in the Notes  shall be  invalid,  illegal  or  unenforceable,  the
validity,  legality and enforceability of the remaining  provisions shall not in
any way be affected or impaired thereby.

                  SECTION 11.14. Table of Contents,  Headings, Etc. The Table of
Contents,  Cross-Reference  Table and  headings of the  Articles and Sections of
this Indenture have been inserted for  convenience of reference only, are not to
be  considered  a part hereof and shall in no way modify or restrict  any of the
terms and provisions hereof.


<PAGE>






                                   SIGNATURES

                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Indenture to be duly executed, all as of the date first written above.


ORION NEWCO SERVICES, INC.                 BANKERS TRUST COMPANY

By:  _____________________________         By: ___________________________

Name:  ___________________________         Name: _________________________

Title: ___________________________         Title: ________________________

ORION NETWORK SYSTEMS, INC.                ORION SATELLITE CORPORATION

By:  _____________________________         By: ___________________________

Name:  ___________________________         Name: _________________________

Title: ___________________________         Title: ________________________

ORIONNET, INC.                             ORION ATLANTIC EUROPE, INC.

By:  _____________________________         By: ___________________________

Name:  ___________________________         Name: _________________________

Title: ___________________________         Title: ________________________

ORION ASIA PACIFIC CORPORATION             ORIONNET FINANCE CORPORATION

By:  _____________________________         By: ___________________________

Name:  ___________________________         Name: _________________________

Title: ___________________________         Title: ________________________

ASIA PACIFIC SPACE AND                     INTERNATIONAL PRIVATE
SATELLITE COMMUNICATIONS, LTD.             PARTNERS, L.P.

By:  _____________________________         By: ___________________________

Name:  ___________________________         Name: _________________________

Title: ___________________________         Title: ________________________



<PAGE>








EXHIBIT A

                               FORM OF GLOBAL NOTE

                                 [FACE OF NOTE]


THE NOTES  EVIDENCED  BY THIS  CERTIFICATE  ARE  INITIALLY  ISSUED AS PART OF AN
ISSUANCE OF UNITS, EACH OF WHICH CONSISTS OF ONE NOTE WITH A PRINCIPAL AMOUNT AT
MATURITY  OF [ ] AND ONE  WARRANT  INITIALLY  ENTITLING  THE  HOLDER  THEREOF TO
PURCHASE [ ] SHARES OF COMMON  STOCK,  PAR VALUE $.01 PER SHARE,  OF ORION NEWCO
SERVICES,  INC.  (THE "COMMON  STOCK").  PRIOR TO THE CLOSE OF BUSINESS UPON THE
EARLIEST TO OCCUR OF (i) [ ], 1997,  (ii) SUCH DATE AS THE  UNDERWRITES  MAY, IN
THEIR DISCRETION DEEM APPROPRIATE OR (iii) IN THE EVENT OF AN OFFER TO PURCHASE,
THE DATE THE COMPANY MAILS NOTICE THEREOF TO THE HOLDERS OF THE NOTES, THE NOTES
EVIDENCED BY THIS  CERTIFICATE  MAY NOT BE TRANSFERRED  OR EXCHANGED  SEPARATELY
FROM, BUT MAY BE TRANSFERRED OR EXCHANGED ONLY TOGETHER WITH, THE WARRANTS.

THIS NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE  GOVERNING THIS
NOTE) IN CUSTODY FOR THE BENEFIT OF THE  BENEFICIAL  OWNERS  HEREOF,  AND IS NOT
TRANSFERABLE TO ANY PERSON UNDER ANY  CIRCUMSTANCES  EXCEPT THAT (I) THIS GLOBAL
NOTE MAY BE  EXCHANGED IN WHOLE BUT NOT IN PART  PURSUANT TO SECTION  2.07(a) OF
THE  INDENTURE,  (II) THIS  GLOBAL  NOTE MAY BE  DELIVERED  TO THE  TRUSTEE  FOR
CANCELLATION  PURSUANT TO SECTION  2.12 OF THE  INDENTURE  AND (III) THIS GLOBAL
NOTE MAY BE TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT
OF ORION NEWCO SERVICES, INC.

FOR THE PURPOSES OF SECTIONS 1272, 1273 AND 1275 OF THE INTERNAL REVENUE CODE OF
1986, AS AMENDED,  THIS SECURITY IS BEING ISSUED WITH ORIGINAL  ISSUE  DISCOUNT;
FOR EACH $1,000 PRINCIPAL AMOUNT OF THIS SECURITY,  THE ISSUE PRICE IS $[ ], THE
AMOUNT OF ORIGINAL ISSUE DISCOUNT IS $[ ]. FOR ADDITIONAL  INFORMATION REGARDING
ORIGINAL  ISSUE  DISCOUNT,  PLEASE CONTACT ORION NEWCO  SERVICES,  2440 RESEARCH
BOULEVARD, SUITE 40, ROCKVILLE, MARYLAND, 20850


<PAGE>



                           ORION NEWCO SERVICES, INC.

                      [___]% Senior Discount Note Due 2007

                                                               CUSIP [ ________]
No.  __________


         Issue Date:        ______________________


         ORION NEWCO SERVICES,  INC., a Delaware corporation,  with registration
number  [_______] (the  "Company",  which term includes any successor  under the
Indenture  hereinafter referred to), for value received,  promises to pay to the
bearer     upon      surrender      hereof     the      principal     sum     of
_________________________________  United States Dollars (U.S.$________________)
on 2007.

         Interest Payment Dates:    [       ] and [  ], commencing [   ] 2002.

         Reference  is hereby  made to the further  provisions  of this Note set
forth on the reverse hereof,  which  provisions shall have the same effect as if
set forth hereon.




<PAGE>



                  IN WITNESS  WHEREOF,  the  Company  has caused this Note to be
signed manually or by facsimile by its duly authorized officer.




Date:                             ORION NEWCO SERVICES, INC.

                                  By: ___________________________
                                                                 
                                  Name: _________________________
                                                                 
                                  Title: ________________________
                                  
This is one of the  [___]%  Senior  Discount  Notes  due 2007  described  in the
within-mentioned Indenture.

                                     BANKERS TRUST COMPANY,
                                     as Trustee


                                     By: _________________________________
                                          Authorized Officer


<PAGE>



                             [REVERSE SIDE OF NOTE]

                           ORION NEWCO SERVICES, INC.

                      [___]% Senior Discount Note due 2007


1.  Principal and Interest.

                  Orion  Newco  Services,  Inc.  (the  "Company")  will  pay the
principal of this Note on [_________________], 2007.

                  The Company  promises to pay interest on the principal  amount
of this Note on each Interest  Payment Date, as set forth below, at the rate per
annum shown above.

                  Interest on the Notes  shall  accrue at the rate of [___]% per
annum  (the  "Interest  Rate")  and shall be  payable  in U.S.  dollars  in cash
semi-annually  in  arrears  on [ ] and [ ] (each an  "Interest  Payment  Date");
provided that no interest shall accrue or be prior to [ ], 2002. Interest on the
Notes will accrue from the most recent date to which  interest  has been paid or
duly  provided  for, or if no interest has been paid or duly  provided for, from
the date of original issuance hereof.  Interest will be computed on the basis of
a 360-day year comprised of twelve 30-day months.

                  The  Company  shall pay  interest  on  overdue  principal  and
premium, if any, and (to the extent lawful) interest on overdue  installments of
interest at the rate of [___]% per annum.


2.  Method of Payment.

                  The Company will pay interest and principal to the Depositary,
with  respect to any Global Note held by the  Depositary.  The Company  will pay
principal,  premium,  if any,  and  interest  in money of the  United  States of
America  that at the time of payment is legal  tender for  payment of public and
private  debts.  However,  the Company may pay principal,  premium,  if any, and
interest by check payable in such money.  If a payment date is a date other than
a Business  Day at a place of payment,  payment may be made at that place on the
next  succeeding day that is a Business Day and no interest shall accrue for the
intervening period.


3.  Paying Agent and Registrar.

                  Initially, the Trustee will act as Paying Agent and Registrar.
The  Company  may  change  any  Paying  Agent and  Registrar  without  notice in
accordance  with the  Indenture.  The Company,  any Affiliate or any  Subsidiary
thereof may act as the Paying Agent or Registrar.


<PAGE>




4.  Indenture; Limitations.

                  The Company  issued the Notes under an  Indenture  dated as of
[__________],  1997  (the  "Indenture"),  between  the  Company,  Orion  Network
Systems,  Inc., Orion Satellite  Corporation,  International  Private  Satellite
Partners,  L.P., OrionNet,  Inc., Orion Asia Pacific  Corporation,  Asia Pacific
Space and Communications, Ltd., Orion Atlantic Europe, Inc. and OrionNet Finance
Corporation,  as  guarantors,  and the Bankers  Trust  Company,  as trustee (the
"Trustee"). Capitalized terms herein are used as defined in the Indenture unless
otherwise  indicated.  The  terms  of the  Notes  include  those  stated  in the
Indenture  and  those  made  part of the  Indenture  by  reference  to the Trust
Indenture Act. The Notes are subject to all such terms, and Holders are referred
to the Indenture and the Trust  Indenture Act for a statement of all such terms.
To the extent  permitted by  applicable  law, in the event of any  inconsistency
between the terms of this Note and the terms of the Indenture,  the terms of the
Indenture shall control.

                  The Notes are unsecured  senior  indebtedness  of the Company.
The Indenture limits the aggregate principal amount of the Notes to $[ ].

5.  Optional Redemption.

                  The Notes will be  redeemable,  at the  Company's  option,  in
whole or in part,  at any  time or from  time to time on or after [ ],  2002 and
prior to maturity, upon not less than 30 nor more than 60 days' prior notice, at
the following  Redemption  Prices  (expressed in percentages of their  principal
amount),  plus accrued and unpaid  interest,  if any, to the Redemption  Date if
redeemed during the 12-month period commencing on October [__] of the applicable
years set forth below:

                  Year                               Redemption Price

                  2002                                      [_____]%
                  2003                                      [_____]%
                  2004 and thereafter                       100.000%


6.  Selection of Notes for Partial Redemption; Effect of Redemption Notice.

                  In the case of any partial redemption,  selection of the Notes
for redemption will be made by the Trustee in compliance  with the  requirements
of the principal national  securities  exchange,  if any, on which the Notes are
listed or, if the Notes are not listed on a national securities  exchange,  on a
pro rata basis,  by lot or by such method as the Trustee in its sole  discretion
shall  deem to be fair  and  appropriate;  provided  that no Note of  $1,000  in
principal  amount  or less  shall  be  redeemed  in  part.  If any Note is to be
redeemed  in part only,  the notice of  redemption  relating  to such Note shall
state the portion of the principal amount thereof to be redeemed.  A new Note in
principal  amount equal to the unredeemed  portion thereof will be issued in the
name of the Holder  thereof upon  cancellation  of the original  Note.  Upon the
giving of any redemption  notice,  interest on Notes called for redemption  will
cease to accrue from and after the date fixed for redemption (unless the Company
defaults in providing  the funds for such  redemption)  and such Notes will then
cease to be outstanding.


<PAGE>





7.  Notice of Redemption.

                  Notice of any optional  redemption  will be mailed at least 30
days but not more than 60 days  before  the  Redemption  Date to the  Holders of
Notes to be redeemed at such  Holder's  registered  address as it appears in the
Register.

8. Repurchase upon Change of  Control.

                  Upon the occurrence of any Change of Control, the Company will
be obligated to make an offer to purchase all outstanding  Notes pursuant to the
Offer to Purchase  described in the Indenture at a purchase  price equal to 101%
of the aggregate  Accreted  Value thereof plus accrued and unpaid  interest,  if
any, to the date of purchase (the "Change of Control Payment").

                  A notice of such  Change of Control  will be mailed  within 30
days after any Change of Control occurs to each Holder of Notes at such Holder's
registered   address  as  it  appears  in  the   Register.   Notes  in  original
denominations  larger than  $1,000 may be sold to the Company in part;  provided
that Notes will only be issued in  denominations  of $1,000  principal amount at
maturity or integral multiples thereof.  On and after the Payment Date, interest
ceases to accrue on Notes or portions of Notes  surrendered  for purchase by the
Company,  unless the  Company  defaults  in the payment of the Change of Control
Payment.

9.  Denomination.

                  This Global Note is in fully  registered  form without coupons
and is denominated in an amount equal to $1,000 of principal  amount at maturity
or an integral multiple thereof and is transferable by delivery.  This Note is a
Global Note.

10.  Persons Deemed Owners.

                  The  holder of this Note shall be treated as the owner of this
Note for all purposes.

11.  Unclaimed Money.

                  If money for the payment of  principal,  premium,  if any, and
interest remains  unclaimed for two years, the Trustee and the Paying Agent will
pay the money back to the Company at its request.  After that,  Holders entitled
to the money must look to the  Company for  payment,  unless an  applicable  law
designates  another  Person,  and all  liability  of the Trustee and such Paying
Agent with respect to such money shall cease.

12.  Discharge Prior to Redemption or Maturity.

                  If the  Company  deposits  with  the  Trustee  money  or  U.S.
Government  Obligations  sufficient  to pay the then  outstanding  principal of,
premium,  if any, and accrued  interest on the Notes (a) to redemption or Stated
Maturity, the Company will be discharged from the Indenture


<PAGE>



and the Notes, except in certain  circumstances for certain sections thereof, or
(b) the Company  will be  discharged  from  certain  covenants  set forth in the
Indenture.

13.  Amendment; Supplement; Waiver.

                  Subject to certain exceptions,  the Indenture or the Notes may
be  amended  or  supplemented  with the  consent  of the  Holders  of at least a
majority in aggregate  principal amount of the Notes then  outstanding,  and any
existing default or compliance with any provision may be waived with the consent
of the Holders of at least a majority in aggregate principal amount of the Notes
then  outstanding.  Without notice to or the consent of any Holder,  the parties
thereto  may amend or  supplement  the  Indenture  or the Notes to,  among other
things,  cure any ambiguity,  defect or  inconsistency  and make any change that
does not materially and adversely affect the rights of any Holder.

14.  Restrictive Covenants.

                  The Indenture  imposes  certain  limitations on the ability of
the Company  and the  Restricted  Subsidiaries,  among  other  things,  to Incur
additional  Indebtedness;  create Liens; pay dividends or make  distributions in
respect  of  their  Capital  Stock;  make  Investments  or  make  certain  other
Restricted  Payments;  engage in Asset Sales;  issue or sell stock of Restricted
Subsidiaries;  enter into transactions with stockholders or Affiliates; or, with
respect to the Company,  consolidate,  merge or sell all or substantially all of
its  assets.  Within 90 days  after the end of the last  fiscal  quarter of each
year,  the  Company  must  report  to  the  Trustee  on  compliance   with  such
limitations.

15.  Successor Persons.

                  Generally, when a successor person or other entity assumes all
the  obligations  of its  predecessor  under the Notes  and the  Indenture,  the
predecessor person will be released from those obligations.

16.  Defaults and Remedies.

                  The following events will be defined as "Events of Default" in
the Indenture:  (a) default in the payment of principal of (or premium,  if any,
on)  any  Note  when  the  same  becomes  due  and  payable  at  maturity,  upon
acceleration, redemption or otherwise; (b) default in the payment of interest on
any Note when the same becomes due and payable, and such default continues for a
period  of 30  days;  provided  that a  failure  to make  any of the  first  six
scheduled  interest  payments on the Notes in a timely manner will constitute an
Event of Default with no grace or cure period;  (c) defaults in the  performance
or breach of the  provisions  of Section 5.01 of the Indenture or the failure to
make or  consummate  an Offer to Purchase in  accordance  with  Section  4.11 or
Section 4.13 of the Indenture; (d) the Company defaults in the performance of or
breaches  any other  covenant or  agreement  of the Company in the  Indenture or
under the Notes (other than a default specified in clause (a), (b) or (c) above)
and such default or breach  continues for a period of 30 consecutive  days after
written notice by the Trustee or the Holders of 25% or


<PAGE>



 more in aggregate  principal  amount at maturity of the Notes; (e) there occurs
with  respect  to any issue or  issues of  Indebtedness  of the  Company  or any
Significant  Subsidiary having an outstanding principal amount of $10 million or
more in the  aggregate  for all such issues of all such  Persons,  whether  such
Indebtedness  now exists or shall hereafter be created,  (I) an event of default
that has caused the holder  thereof to declare such  Indebtedness  to be due and
payable  prior  to its  Stated  Maturity  and  such  Indebtedness  has not  been
discharged  in full or such  acceleration  has not been  rescinded  or  annulled
within 30 days of such acceleration  and/or (II) the failure to make a principal
payment at the final (but not any interim)  fixed  maturity  and such  defaulted
payment  shall not have been  made,  waived or  extended  within 30 days of such
payment default;  (f) any final judgment or order (not covered by insurance) for
the  payment  of money in excess of $10  million in the  aggregate  for all such
final  judgments or orders against all such Persons  (treating any  deductibles,
self-insurance  or  retention as not so covered)  shall be rendered  against the
Company or any Significant  Subsidiary and shall not be paid or discharged,  and
there shall be any period of 30 consecutive  days  following  entry of the final
judgment or order that causes the aggregate  amount for all such final judgments
or orders  outstanding  and not paid or  discharged  against all such Persons to
exceed $10 million  during which a stay of enforcement of such final judgment or
order, by reason of a pending appeal or otherwise, shall not be in effect; (g) a
court  having  jurisdiction  in the  premises  enters a decree  or order for (A)
relief in respect of the Company or any Significant Subsidiary in an involuntary
case under any  applicable  bankruptcy,  insolvency  or other similar law now or
hereafter  in effect,  (B)  appointment  of a  receiver,  liquidator,  assignee,
custodian,  trustee,  sequestrator  or similar  official  of the  Company or any
Significant  Subsidiary  or for all or  substantially  all of the  property  and
assets of the  Company or any  Significant  Subsidiary  or (C) the winding up or
liquidation of the affairs of the Company or any Significant  Subsidiary and, in
each case, such decree or order shall remain unstayed and in effect for a period
of 30  consecutive  days; or (h) the Company or any  Significant  Subsidiary (A)
commences a voluntary case under any applicable bankruptcy,  insolvency or other
similar law now or hereafter in effect, or consents to the entry of an order for
relief  in an  involuntary  case  under  any  such  law,  (B)  consents  to  the
appointment  of  or  taking  possession  by a  receiver,  liquidator,  assignee,
custodian,  trustee,  sequestrator  or similar  official  of the  Company or any
Significant  Subsidiary  or for all or  substantially  all of the  property  and
assets of the Company or any  Significant  Subsidiary or (C) effects any general
assignment for the benefit of creditors.

                  If an  Event  of  Default  (other  than an  Event  of  Default
specified  in clause (g) or (h) above that occurs with  respect to the  Company)
occurs and is continuing  under the Indenture,  the Trustee or the Holders of at
least 25% in aggregate  accreted  value  outstanding,  by written  notice to the
Company  (and to the Trustee if such notice is given by the  Holders),  may, and
the Trustee at the request of such Holders shall,  declare the principal  amount
of, premium, if any, and accrued interest on the Notes to be immediately due and
payable. Upon a declaration of acceleration,  such principal amount of, premium,
if any, and accrued interest shall be immediately due and payable.  In the event
of a declaration of acceleration because an Event of Default set forth in clause
(e) above has occurred and is continuing, such declaration of acceleration shall
be automatically  rescinded and annulled if the event of default triggering such
Event of  Default  pursuant  to  clause  (e) shall be  remedied  or cured by the
Company or the relevant  Significant  Subsidiary or waived by the holders of the
relevant  Indebtedness within 60 days after the declaration of acceleration with
respect thereto. If an Event of Default specified in clause (g) or


<PAGE>



(h) above occurs with respect to the Company,  the principal amount of, premium,
if any,  and  accrued  interest on the Notes then  outstanding  shall ipso facto
become and be immediately  due and payable  without any declaration or other act
on the part of the Trustee or any Holder.  The Holders of at least a majority in
principal  amount at maturity of the outstanding  Notes by written notice to the
Company and to the Trustee,  may waive all past defaults and rescind and annul a
declaration of acceleration  and its  consequences if (i) all existing Events of
Default,  other than the  nonpayment of the principal of,  premium,  if any, and
interest  on the Notes  that have  become  due  solely  by such  declaration  of
acceleration,  have  been  cured or  waived  and (ii) the  rescission  would not
conflict with any judgment or decree of a court of competent jurisdiction.

                  The  Holders of at least a  majority  in  aggregate  principal
amount at  maturity  of the  outstanding  Notes may direct the time,  method and
place of conducting any  proceeding  for any remedy  available to the Trustee or
exercising any trust or power conferred on the Trustee. However, the Trustee may
refuse to follow any direction that  conflicts  with law or the Indenture,  that
may involve the Trustee in personal liability, or that the Trustee determines in
good  faith may be unduly  prejudicial  to the  rights of  Holders  of Notes not
joining in the giving of such  direction  and may take any other action it deems
proper that is not inconsistent with any such direction received from Holders of
Notes.  A Holder may not pursue any remedy with respect to the  Indenture or the
Notes unless:  (i) the Holder gives the Trustee  written  notice of a continuing
Event of Default; (ii) the Holders of at least 25% in aggregate principal amount
at maturity of outstanding Notes make a written request to the Trustee to pursue
the  remedy;   (iii)  such  Holder  or  Holders  offer  the  Trustee   indemnity
satisfactory  to the Trustee against any costs,  liability or expense;  (iv) the
Trustee  does not comply  with the request  within 60 days after  receipt of the
request  and the offer of  indemnity;  and (v) during such  60-day  period,  the
Holders  of a  majority  in  aggregate  principal  amount  at  maturity  of  the
outstanding  Notes do not give the Trustee a direction that is inconsistent with
the request.  However,  such limitations do not apply to the right of any Holder
of a Note to receive payment of the principal of,  premium,  if any, or interest
on, such Note or to bring suit for the  enforcement  of any such payment,  on or
after the due date expressed in the Notes,  which right shall not be impaired or
affected without the consent of the Holder.

17.  Trustee Dealings with Company.

                  The Trustee  under the  Indenture,  in its  individual  or any
other capacity, may become owner or pledgee of Notes and may otherwise deal with
the Company or its Affiliates  with the same rights it would have if it were not
the Trustee.

18.  No Recourse Against Others.

                  No recourse for the payment of the principal of,  premium,  if
any, or interest on any of the Notes or for any claim based thereon or otherwise
in respect  thereof,  and no recourse under or upon any obligation,  covenant or
agreement of the Company in the Indenture,  or in any of the Notes or because of
the creation of any Indebtedness  represented thereby,  shall be had against any
incorporator,  stockholder, officer, director, employee or controlling person of
the


<PAGE>



 Company or of any  successor  Person  thereof.  Each Holder,  by accepting  the
Notes, waives and releases all such liability.

19.  Authentication.

                  This  Note   shall  not  be  valid   until  the   Trustee   or
authenticating  agent signs the certificate of  authentication on the other side
of this Note.

20.  CUSIP Numbers.

                  Pursuant to a  recommendation  promulgated by the Committee on
Uniform Security Identification Procedures, the Company has caused CUSIP numbers
to be printed on the Notes and the Trustee  may use CUSIP  numbers in notices of
redemption  as a convenience  to Holders.  No  representation  is made as to the
accuracy of such  numbers  either as printed on the Notes or as contained in any
notice of redemption and reliance may be placed only on the other identification
numbers placed thereon.

                  THE  INTERNAL  LAWS OF THE STATE OF NEW YORK SHALL GOVERN THIS
NOTE WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS.

                  The Company will  furnish to any Holder upon  written  request
and without charge a copy of the Indenture.  Requests may be made to Orion Newco
Services,  Inc., 2440 Research Boulevard,  Suite 40, Rockville,  Maryland 20850,
Attention: [____________].





<PAGE>



                                   SCHEDULE A

                  SCHEDULE OF PRINCIPAL AMOUNT OF INDEBTEDNESS
                             EVIDENCED BY THIS NOTE


                  The initial principal amount of indebtedness evidenced by this
Note shall be $ , , . The following  decreases/increases in the principal amount
evidenced by this Note have been made:
<TABLE>
<CAPTION>

                    Decrease in       Increase in      Total Principal Amount of
                    Principal         Principal        this Global Note Following    Notation Made
Date of Decrease/   Amount of this    Amount of this   such Decrease/Increase        by or on
Increase            Global Note       Global Note                                    Behalf of
                                                                                     Trustee

<S>                 <C>


















</TABLE>

<PAGE>



                       OPTION OF HOLDER TO ELECT PURCHASE


                  If you  wish  to  have  this  Note  purchased  by the  Company
pursuant to Section 4.11 or Section 4.13 of the Indenture, check the box:

                  If you wish to have a portion  of this Note  purchased  by the
Company  pursuant to Section  4.11 or Section 4.13 of the  Indenture,  state the
amount (in principal amount):
$___________________ ($1000 or integral multiple thereof).

Date:

Your Signature:


Signature Guarantee:  ______________________________




<PAGE>




EXHIBIT B

                            FORM OF CERTIFICATED NOTE

                                 [FACE OF NOTE]


THE NOTES  EVIDENCED  BY THIS  CERTIFICATE  ARE  INITIALLY  ISSUED AS PART OF AN
ISSUANCE OF UNITS, EACH OF WHICH CONSISTS OF ONE NOTE WITH AMOUNT AT MATURITY OF
$[____] AND ONE WARRANT  INITIALLY  ENTITLING THE HOLDER  THEREOF TO PURCHASE AN
EQUAL NUMBER OF SHARES OF COMMON STOCK, PAR VALUE $.01 PER SHARE, OF ORION NEWCO
SERVICES,  INC.  (THE "COMMON  STOCK").  PRIOR TO THE CLOSE OF BUSINESS UPON THE
EARLIEST TO OCCUR OF (i) [ ], 1997,  (ii) SUCH DATE AS THE  UNDERWRITES  MAY, IN
THEIR DISCRETION DEEM APPROPRIATE OR (iii) IN THE EVENT OF AN OFFER TO PURCHASE,
THE DATE THE COMPANY MAILS NOTICE THEREOF TO THE HOLDERS OF THE NOTES, THE NOTES
EVIDENCED BY THIS  CERTIFICATE  MAY NOT BE TRANSFERRED  OR EXCHANGED  SEPARATELY
FROM, BUT MAY BE TRANSFERRED OR EXCHANGED ONLY TOGETHER WITH, THE WARRANTS.

FOR THE PURPOSES OF SECTIONS 1272, 1273 AND 1275 OF THE INTERNAL REVENUE CODE OF
1986, AS AMENDED,  THIS SECURITY IS BEING ISSUED WITH ORIGINAL  ISSUE  DISCOUNT;
FOR EACH $1,000 PRINCIPAL AMOUNT OF THIS SECURITY,  THE ISSUE PRICE IS $[ ], THE
AMOUNT OF ORIGINAL ISSUE DISCOUNT IS $[ ]. FOR ADDITIONAL  INFORMATION REGARDING
ORIGINAL  ISSUE  DISCOUNT,  PLEASE CONTACT ORION NEWCO  SERVICES,  2440 RESEARCH
BOULEVARD, SUITE 40, ROCKVILLE, MARYLAND, 20850


<PAGE>



                                    ORION NEWCO SERVICES, INC.

                               [___]% Senior Discount Note Due 2007

                                                               CUSIP [ ________]
No.  __________


         Issue Date:        ______________________


         ORION NEWCO SERVICES,  INC., a Delaware corporation,  with registration
number  [_______] (the  "Company",  which term includes any successor  under the
Indenture  hereinafter referred to), for value received,  promises to pay to the
bearer     upon      surrender      hereof     the      principal     sum     of
_________________________________  United States Dollars (U.S.$________________)
on 2007.

         Interest Payment Dates:    [       ] and [  ], commencing [   ] 2002.

         Reference  is hereby  made to the further  provisions  of this Note set
forth on the reverse hereof,  which  provisions shall have the same effect as if
set forth hereon.




<PAGE>



                  IN WITNESS  WHEREOF,  the  Company  has caused this Note to be
signed manually or by facsimile by its duly authorized officer.

Date:                             ORION NEWCO SERVICES, INC.


                                 By: ___________________________________

                                 Name: _________________________________

                                 Title:_________________________________

This is one of the  [___]%  Senior  Discount  Notes  due 2007  described  in the
within-mentioned Indenture.

                                  BANKERS TRUST COMPANY,
                                  as Trustee


                                  By: _______________________________
                                       Authorized Officer


<PAGE>



                             [REVERSE SIDE OF NOTE]

                           ORION NEWCO SERVICES, INC.

                           [___]% Senior Note due 2007


1.  Principal and Interest.

                  Orion  Newco  Services,  Inc.  (the  "Company")  will  pay the
principal of this Note on [_______________], 2007.

                  The Company  promises to pay interest on the principal  amount
of this Note on each Interest  Payment Date, as set forth below, at the rate per
annum shown above.

                  Interest on the Notes  shall  accrue at the rate of [___]% per
annum  (the  "Interest  Rate")  and shall be  payable  in U.S.  dollars  in cash
semi-annually  in  arrears  on [ ] and [ ] (each an  "Interest  Payment  Date");
provided that no interest shall accure prior to [ ], 2002. Interest on the Notes
will accrue from the most  recent date to which  interest  has been paid or duly
provided  for, or if no interest has been paid or duly  provided  for,  from the
date of original  issuance  hereof.  Interest will be computed on the basis of a
360-day year comprised of twelve 30-day months.

                  The  Company  shall pay  interest  on  overdue  principal  and
premium, if any, and (to the extent lawful) interest on overdue  installments of
interest at the rate of [___]% per annum.


2.  Method of Payment.

                  The  Company  will pay  interest on the Notes to the Holder of
this  Note upon  presentment  hereof at the  office of the  Paying  Agent of the
Company maintained for that purpose in the Borough of Manhattan, the City of New
York.  Holders must  surrender  Notes to such Paying Agent to collect  principal
payments. The Company will pay principal, premium, if any, and interest in money
of the United  States of America that at the time of payment is legal tender for
payment of public and private  debts.  However,  the Company may pay  principal,
premium,  if any, and interest by check payable in such money. If a payment date
is a date other than a Business  Day at a place of payment,  payment may be made
at that place on the next  succeeding day that is a Business Day and no interest
shall accrue for the intervening period.


3.  Paying Agent and Registrar.

                  Initially, the Trustee will act as Paying Agent and Registrar.
The  Company  may  change  any  Paying  Agent and  Registrar  without  notice in
accordance  with the  Indenture.  The Company,  any Affiliate or any  Subsidiary
thereof may act as the Paying Agent or Registrar.


<PAGE>





4.  Indenture; Limitations.

                  The Company  issued the Notes under an  Indenture  dated as of
[__________],  1997  (the  "Indenture"),  between  the  Company,  Orion  Network
Systems,  Inc., Orion Satellite  Corporation,  International  Private  Satellite
Partners,  L.P., OrionNet,  Inc., Orion Asia Pacific  Corporation,  Asia Pacific
Space and Communications, Ltd., Orion Atlantic Europe, Inc. and OrionNet Finance
Corporation,  as  guarantors,  and the Bankers  Trust  Company,  as trustee (the
"Trustee"). Capitalized terms herein are used as defined in the Indenture unless
otherwise  indicated.  The  terms  of the  Notes  include  those  stated  in the
Indenture  and  those  made  part of the  Indenture  by  reference  to the Trust
Indenture Act. The Notes are subject to all such terms, and Holders are referred
to the Indenture and the Trust  Indenture Act for a statement of all such terms.
To the extent  permitted by  applicable  law, in the event of any  inconsistency
between the terms of this Note and the terms of the Indenture,  the terms of the
Indenture shall control.

                  The Notes are unsecured  senior  indebtedness  of the Company.
The Indenture limits the aggregate principal amount of the Notes to $[ ].

5.  Optional Redemption.

                  The Notes will be  redeemable,  at the  Company's  option,  in
whole or in part,  at any  time or from  time to time on or after [ ],  2002 and
prior to maturity, upon not less than 30 nor more than 60 days' prior notice, at
the following  Redemption  Prices  (expressed in percentages of their  principal
amount),  plus accrued and unpaid  interest,  if any, to the Redemption  Date if
redeemed during the 12-month period commencing on October [__] of the applicable
years set forth below:

                  Year                               Redemption Price

                  2002                                      [_____]%
                  2003                                      [_____]%
                  2004 and thereafter                       100.000%


6.  Selection of Notes for Partial Redemption; Effect of Redemption Notice.

                  In the case of any partial redemption,  selection of the Notes
for redemption will be made by the Trustee in compliance  with the  requirements
of the principal national  securities  exchange,  if any, on which the Notes are
listed or, if the Notes are not listed on a national securities  exchange,  on a
pro rata basis,  by lot or by such method as the Trustee in its sole  discretion
shall  deem to be fair  and  appropriate;  provided  that no Note of  $1,000  in
principal  amount  or less  shall  be  redeemed  in  part.  If any Note is to be
redeemed  in part only,  the notice of  redemption  relating  to such Note shall
state the portion of the principal amount thereof to be redeemed.  A new Note in
principal  amount equal to the unredeemed  portion thereof will be issued in the
name of the Holder  thereof upon  cancellation  of the original  Note.  Upon the
giving of any redemption  notice,  interest on Notes called for redemption  will
cease to accrue from and


<PAGE>



 after the date fixed for redemption  (unless the Company  defaults in providing
the funds for such redemption) and such Notes will then cease to be outstanding.

7.  Notice of Redemption.

                  Notice of any optional  redemption  will be mailed at least 30
days but not more than 60 days  before  the  Redemption  Date to the  Holders of
Notes to be redeemed at such  Holder's  registered  address as it appears in the
Register.

8. Repurchase upon Change of  Control.

                  Upon the occurrence of any Change of Control, the Company will
be obligated to make an offer to purchase all outstanding  Notes pursuant to the
Offer to Purchase  described in the Indenture at a purchase  price equal to 101%
of the aggregate  Accreted  Value thereof plus accrued and unpaid  interest,  if
any, to the date of purchase (the "Change of Control Payment").

                  A notice of such  Change of Control  will be mailed  within 30
days after any Change of Control occurs to each Holder of Notes at such Holder's
registered   address  as  it  appears  in  the   Register.   Notes  in  original
denominations  larger than  $1,000 may be sold to the Company in part;  provided
that Notes will only be issued in  denominations  of $1,000  principal amount at
maturity or integral multiples thereof.  On and after the Payment Date, interest
ceases to accrue on Notes or portions of Notes  surrendered  for purchase by the
Company,  unless the  Company  defaults  in the payment of the Change of Control
Payment.

9.  Denomination.

                  This  Certificated  Note is in fully  registered  form without
coupons and is denominated  in an amount equal to $1,000 of principal  amount at
maturity or an integral  multiple thereof and is transferable by presentation or
surrender to the  registrar  for  registration  of transfer  either  endorsed or
accompanied  by a written  instrument  of transfer in form  satisfactory  to the
registrar.

10.  Persons Deemed Owners.

                  The  holder of this Note shall be treated as the owner of this
Note for all purposes.

11.  Unclaimed Money.

                  If money for the payment of  principal,  premium,  if any, and
interest remains  unclaimed for two years, the Trustee and the Paying Agent will
pay the money back to the Company at its request.  After that,  Holders entitled
to the money must look to the  Company for  payment,  unless an  applicable  law
designates  another  Person,  and all  liability  of the Trustee and such Paying
Agent with respect to such money shall cease.


<PAGE>





12.  Discharge Prior to Redemption or Maturity.

                  If the  Company  deposits  with  the  Trustee  money  or  U.S.
Government  Obligations  sufficient  to pay the then  outstanding  principal of,
premium,  if any, and accrued  interest on the Notes (a) to redemption or Stated
Maturity,  the Company  will be  discharged  from the  Indenture  and the Notes,
except in certain circumstances for certain sections thereof, or (b) the Company
will be discharged from certain covenants set forth in the Indenture.

13.  Amendment; Supplement; Waiver.

                  Subject to certain exceptions,  the Indenture or the Notes may
be  amended  or  supplemented  with the  consent  of the  Holders  of at least a
majority in aggregate  principal amount of the Notes then  outstanding,  and any
existing default or compliance with any provision may be waived with the consent
of the Holders of at least a majority in aggregate principal amount of the Notes
then  outstanding.  Without notice to or the consent of any Holder,  the parties
thereto  may amend or  supplement  the  Indenture  or the Notes to,  among other
things,  cure any ambiguity,  defect or  inconsistency  and make any change that
does not materially and adversely affect the rights of any Holder.

14.  Restrictive Covenants.

                  The Indenture  imposes  certain  limitations on the ability of
the Company  and the  Restricted  Subsidiaries,  among  other  things,  to Incur
additional  Indebtedness;  create Liens; pay dividends or make  distributions in
respect  of  their  Capital  Stock;  make  Investments  or  make  certain  other
Restricted  Payments;  engage in Asset Sales;  issue or sell stock of Restricted
Subsidiaries;  enter into transactions with stockholders or Affiliates; or, with
respect to the Company,  consolidate,  merge or sell all or substantially all of
its  assets.  Within 90 days  after the end of the last  fiscal  quarter of each
year,  the  Company  must  report  to  the  Trustee  on  compliance   with  such
limitations.

15.  Successor Persons.

                  Generally, when a successor person or other entity assumes all
the  obligations  of its  predecessor  under the Notes  and the  Indenture,  the
predecessor person will be released from those obligations.

16.  Defaults and Remedies.

                  The following events will be defined as "Events of Default" in
the Indenture:  (a) default in the payment of principal of (or premium,  if any,
on)  any  Note  when  the  same  becomes  due  and  payable  at  maturity,  upon
acceleration, redemption or otherwise; (b) default in the payment of interest on
any Note when the same becomes due and payable, and such default continues for a
period  of 30  days;  provided  that a  failure  to make  any of the  first  six
scheduled  interest  payments on the Notes in a timely manner will constitute an
Event of Default with no grace or cure period;  (c) defaults in the  performance
or breach of the provisions of Section 5.01


<PAGE>



 of the  Indenture or the failure to make or  consummate an Offer to Purchase in
accordance  with Section 4.11 or Section 4.13 of the Indenture;  (d) the Company
defaults in the  performance  of or breaches any other  covenant or agreement of
the Company in the Indenture or under the Notes (other than a default  specified
in clause  (a),  (b) or (c) above) and such  default or breach  continues  for a
period of 30 consecutive days after written notice by the Trustee or the Holders
of 25% or more in aggregate principal amount at maturity of the Notes; (e) there
occurs with respect to any issue or issues of Indebtedness of the Company or any
Significant  Subsidiary having an outstanding principal amount of $10 million or
more in the  aggregate  for all such issues of all such  Persons,  whether  such
Indebtedness  now exists or shall hereafter be created,  (I) an event of default
that has caused the holder  thereof to declare such  Indebtedness  to be due and
payable  prior  to its  Stated  Maturity  and  such  Indebtedness  has not  been
discharged  in full or such  acceleration  has not been  rescinded  or  annulled
within 30 days of such acceleration  and/or (II) the failure to make a principal
payment at the final (but not any interim)  fixed  maturity  and such  defaulted
payment  shall not have been  made,  waived or  extended  within 30 days of such
payment default;  (f) any final judgment or order (not covered by insurance) for
the  payment  of money in excess of $10  million in the  aggregate  for all such
final  judgments or orders against all such Persons  (treating any  deductibles,
self-insurance  or  retention as not so covered)  shall be rendered  against the
Company or any Significant  Subsidiary and shall not be paid or discharged,  and
there shall be any period of 30 consecutive  days  following  entry of the final
judgment or order that causes the aggregate  amount for all such final judgments
or orders  outstanding  and not paid or  discharged  against all such Persons to
exceed $10 million  during which a stay of enforcement of such final judgment or
order, by reason of a pending appeal or otherwise, shall not be in effect; (g) a
court  having  jurisdiction  in the  premises  enters a decree  or order for (A)
relief in respect of the Company or any Significant Subsidiary in an involuntary
case under any  applicable  bankruptcy,  insolvency  or other similar law now or
hereafter  in effect,  (B)  appointment  of a  receiver,  liquidator,  assignee,
custodian,  trustee,  sequestrator  or similar  official  of the  Company or any
Significant  Subsidiary  or for all or  substantially  all of the  property  and
assets of the  Company or any  Significant  Subsidiary  or (C) the winding up or
liquidation of the affairs of the Company or any Significant  Subsidiary and, in
each case, such decree or order shall remain unstayed and in effect for a period
of 30  consecutive  days; or (h) the Company or any  Significant  Subsidiary (A)
commences a voluntary case under any applicable bankruptcy,  insolvency or other
similar law now or hereafter in effect, or consents to the entry of an order for
relief  in an  involuntary  case  under  any  such  law,  (B)  consents  to  the
appointment  of  or  taking  possession  by a  receiver,  liquidator,  assignee,
custodian,  trustee,  sequestrator  or similar  official  of the  Company or any
Significant  Subsidiary  or for all or  substantially  all of the  property  and
assets of the Company or any  Significant  Subsidiary or (C) effects any general
assignment for the benefit of creditors.

                  If an  Event  of  Default  (other  than an  Event  of  Default
specified  in clause (g) or (h) above that occurs with  respect to the  Company)
occurs and is continuing  under the Indenture,  the Trustee or the Holders of at
least 25% in aggregate  accreted  value  outstanding,  by written  notice to the
Company  (and to the Trustee if such notice is given by the  Holders),  may, and
the Trustee at the request of such Holders shall,  declare the principal  amount
of, premium, if any, and accrued interest on the Notes to be immediately due and
payable. Upon a declaration of acceleration,  such principal amount of, premium,
if any, and accrued interest shall be immediately due and payable.  In the event
of a declaration of acceleration because an Event of Default set


<PAGE>



forth in clause (e) above has occurred and is  continuing,  such  declaration of
acceleration  shall be  automatically  rescinded  and  annulled  if the event of
default  triggering  such  Event of  Default  pursuant  to  clause  (e) shall be
remedied  or cured by the  Company or the  relevant  Significant  Subsidiary  or
waived by the  holders  of the  relevant  Indebtedness  within 60 days after the
declaration  of  acceleration  with  respect  thereto.  If an Event  of  Default
specified in clause (g) or (h) above  occurs with  respect to the  Company,  the
principal  amount of,  premium,  if any, and accrued  interest on the Notes then
outstanding  shall ipso facto become and be immediately  due and payable without
any  declaration  or other act on the part of the  Trustee  or any  Holder.  The
Holders  of at  least  a  majority  in  principal  amount  at  maturity  of  the
outstanding Notes by written notice to the Company and to the Trustee, may waive
all past defaults and rescind and annul a declaration  of  acceleration  and its
consequences if (i) all existing Events of Default, other than the nonpayment of
the  principal of,  premium,  if any, and interest on the Notes that have become
due solely by such  declaration of  acceleration,  have been cured or waived and
(ii) the rescission would not conflict with any judgment or decree of a court of
competent jurisdiction.

                  The  Holders of at least a  majority  in  aggregate  principal
amount at  maturity  of the  outstanding  Notes may direct the time,  method and
place of conducting any  proceeding  for any remedy  available to the Trustee or
exercising any trust or power conferred on the Trustee. However, the Trustee may
refuse to follow any direction that  conflicts  with law or the Indenture,  that
may involve the Trustee in personal liability, or that the Trustee determines in
good  faith may be unduly  prejudicial  to the  rights of  Holders  of Notes not
joining in the giving of such  direction  and may take any other action it deems
proper that is not inconsistent with any such direction received from Holders of
Notes.  A Holder may not pursue any remedy with respect to the  Indenture or the
Notes unless:  (i) the Holder gives the Trustee  written  notice of a continuing
Event of Default; (ii) the Holders of at least 25% in aggregate principal amount
at maturity of outstanding Notes make a written request to the Trustee to pursue
the  remedy;   (iii)  such  Holder  or  Holders  offer  the  Trustee   indemnity
satisfactory  to the Trustee against any costs,  liability or expense;  (iv) the
Trustee  does not comply  with the request  within 60 days after  receipt of the
request  and the offer of  indemnity;  and (v) during such  60-day  period,  the
Holders  of a  majority  in  aggregate  principal  amount  at  maturity  of  the
outstanding  Notes do not give the Trustee a direction that is inconsistent with
the request.  However,  such limitations do not apply to the right of any Holder
of a Note to receive payment of the principal of,  premium,  if any, or interest
on, such Note or to bring suit for the  enforcement  of any such payment,  on or
after the due date expressed in the Notes,  which right shall not be impaired or
affected without the consent of the Holder.

17.  Trustee Dealings with Company.

                  The Trustee  under the  Indenture,  in its  individual  or any
other capacity, may become owner or pledgee of Notes and may otherwise deal with
the Company or its Affiliates  with the same rights it would have if it were not
the Trustee.


<PAGE>





18.  No Recourse Against Others.

                  No recourse for the payment of the principal of,  premium,  if
any, or interest on any of the Notes or for any claim based thereon or otherwise
in respect  thereof,  and no recourse under or upon any obligation,  covenant or
agreement of the Company in the Indenture,  or in any of the Notes or because of
the creation of any Indebtedness  represented thereby,  shall be had against any
incorporator,  stockholder, officer, director, employee or controlling person of
the Company or of any successor  Person thereof.  Each Holder,  by accepting the
Notes, waives and releases all such liability.

19.  Authentication.

                  This  Note   shall  not  be  valid   until  the   Trustee   or
authenticating  agent signs the certificate of  authentication on the other side
of this Note.

20.  CUSIP Numbers.

                  Pursuant to a  recommendation  promulgated by the Committee on
Uniform Security Identification Procedures, the Company has caused CUSIP numbers
to be printed on the Notes and the Trustee  may use CUSIP  numbers in notices of
redemption  as a convenience  to Holders.  No  representation  is made as to the
accuracy of such  numbers  either as printed on the Notes or as contained in any
notice of redemption and reliance may be placed only on the other identification
numbers placed thereon.

                  The  internal  laws of the State of New York shall govern this
Note without regard to principles of conflict of laws.

                  The Company will  furnish to any Holder upon  written  request
and without charge a copy of the Indenture.  Requests may be made to Orion Newco
Services,  Inc., 2440 Research Boulevard,  Suite 40, Rockville,  Maryland 20850,
Attention: [____________].




<PAGE>



SCHEDULE A

                  SCHEDULE OF PRINCIPAL AMOUNT OF INDEBTEDNESS
                             EVIDENCED BY THIS NOTE


                  The initial principal amount of indebtedness evidenced by this
Note shall be $ , , . The following  decreases/increases in the principal amount
evidenced by this Note have been made:
<TABLE>
<CAPTION>

                    Decrease in       Increase in      Total Principal Amount of
                    Principal         Principal        this Global Note Following    Notation Made
Date of Decrease/   Amount of this    Amount of this   such Decrease/Increase        by or on
Increase            Global Note       Global Note                                    Behalf of
                                                                                     Trustee
<S>                 <C>



















</TABLE>

<PAGE>



                       OPTION OF HOLDER TO ELECT PURCHASE


                  If you  wish  to  have  this  Note  purchased  by the  Company
pursuant to Section 4.11 or Section 4.13 of the Indenture, check the box:

                  If you wish to have a portion  of this Note  purchased  by the
Company  pursuant to Section  4.11 or Section 4.13 of the  Indenture,  state the
amount (in principal amount):
$___________________ ($1000 or integral multiple thereof).

Date: _______________________

Your Signature:  ___________________________________


Signature Guarantee:  ______________________________






EXHIBIT C


                    COLLATERAL PLEDGE AND SECURITY AGREEMENT


                  This  COLLATERAL  PLEDGE AND SECURITY  AGREEMENT (this "Pledge
Agreement")  is made and  entered  into as of  [_________],  1997 by ORION NEWCO
SERVICES,  INC., a Delaware  corporation (the  "Pledgor"),  having its principal
office at 2440 Research  Boulevard,  Suite 40,  Rockville,  Maryland,  20850, in
favor of  BANKERS  TRUST  COMPANY,  a banking  corporation  duly  organized  and
existing  under the laws of the State of New York,  having an office at 4 Albany
Street, New York, New York, 10006,  Attention:  Corporate Trustee Administration
Department,  as trustee (the  "Trustee") for the holders (the  "Holders") of the
Notes (as defined herein) issued by the Pledgor under the Indenture  referred to
below.

                               W I T N E S S E T H

                  WHEREAS,  the  Pledgor,   each  of  the  Pledgor's  Restricted
Subsidiaries, as guarantors, and Bankers Trust Company, as Trustee, have entered
into that certain  indenture dated as of the date hereof (as amended,  restated,
supplemented or otherwise modified from time to time, the "Indenture"), pursuant
to which the Pledgor is issuing on the date  hereof  $[_________]  in  aggregate
principal  amount of [____]%  Senior Notes due 2007 (the  "Notes");  capitalized
terms used herein and not otherwise defined herein shall have the meanings given
to such terms in the Indenture; and

                  WHEREAS, the Pledgor has agreed, pursuant to the Indenture, to
(i) purchase Government  Securities (the "Pledged Securities") in an amount that
will be sufficient upon receipt of scheduled  interest and principal payments in
respect thereof,  in the opinion of a nationally  recognized firm of independent
accountants selected by the Pledgor and delivered to the Trustee, to provide for
payment of the first six scheduled  interest  payments due on the Notes and (ii)
place the Pledged  Securities  in an account held by the Trustee for the benefit
of Holders of the Notes; and

                  WHEREAS,  upon the  purchase  of the Pledged  Securities,  the
Pledgor will be the beneficial owner of the Pledged Securities; and

                  WHEREAS,  to secure the  obligation  of the Pledgor  under the
Indenture and the Notes to pay in full the first six scheduled interest payments
on the Notes and to secure  repayment  of the Notes in the event  that the Notes
become due and payable  prior to such time as the first six  scheduled  interest
payments thereon shall have been paid in full (the  "Obligations"),  the Pledgor
has agreed to (i) pledge to the Trustee for its benefit and the ratable  benefit
of the Holders of the Notes, a security interest in the Pledged Securities,  all
book-entry interests therein and the Pledge Account (as defined herein) and (ii)
execute and deliver  this  Pledge  Agreement  in order to secure the payment and
performance by the Pledger of all the Obligations.


<PAGE>

                                    AGREEMENT


                  NOW, THEREFORE, in consideration of the mutual promises herein
contained,  and in order to induce  the  Holders  of the Notes to  purchase  the
Notes,  the  Pledgor  hereby  agrees  with the  Trustee,  for the benefit of the
Trustee and for the ratable benefit of the Holders of the Notes, as follows:

                  SECTION 1. Pledge and Grant of Security Interest.  The Pledgor
hereby pledges to the Trustee for its benefit and for the ratable benefit of the
Holders of the Notes,  and grants to the  Trustee  for its  benefit  and for the
ratable  benefit of the  Holders  of the  Notes,  a  continuing  first  priority
security  interest in and to (a) all of Pledgor's  right,  title and interest in
the Pledged Securities and the Pledge Account,  (b) all book-entry  interests in
the Pledged  Securities  and any  certificates  or other  evidence of  ownership
representing  the Pledged  Securities and the Pledge Account,  and (c) except as
otherwise  provided  herein,  all  products  and  proceeds of any of the Pledged
Securities and the Pledge Account, including, without limitation, all dividends,
interest,  principal payments,  cash, options,  warrants,  rights,  instruments,
subscriptions  and  other  property  or  proceeds  from  time to time  received,
receivable  or  otherwise  distributed  or  distributable  in  respect  of or in
exchange  for  any  or  all  of  the  Pledged  Securities   (collectively,   the
"Collateral").

                  SECTION 2.  Security  for  Obligation.  This Pledge  Agreement
secures the prompt and  complete  payment and  performance  when due (whether at
stated maturity, by acceleration or otherwise) of all the Obligations.

                  SECTION 3. Delivery of Collateral;  Pledge Account;  Interest.
(a) All  certificates  or  instruments,  if any,  representing or evidencing the
Collateral  shall  be  delivered  to and  held by or on  behalf  of the  Trustee
pursuant hereto and shall be in suitable form for transfer by delivery, or shall
be accompanied by duly executed  instruments of transfer or assignment in blank,
all in form reasonably satisfactory to the Trustee, and all book-entry interests
in the Pledged Securities shall be transferred to the Pledge Account through the
individual  account of the Trustee at the Federal  Reserve Bank of New York. The
Trustee in its individual  capacity shall confirm in writing (such  confirmation
to be in the form of Exhibit A hereto) to the  Pledgor and to the Trustee in its
capacity  as  Trustee  hereunder  that  it is  holding  the  book-entry  Pledged
Securities  for the benefit of the Trustee in its capacity as Trustee  hereunder
and the  ratable  benefit  of the  Holders of Notes and the  Trustee  shall duly
record in its books and  records  that the  Pledgor  has  pledged  and granted a
security interest in such book-entry  interests in the Pledged Securities and in
the  Pledge  Account to the  Trustee on behalf of itself and the  holders of the
Notes.

                  (b)  Concurrently  with the execution and delivery  hereof and
         prior to the delivery of any  certificates or instruments  representing
         or evidencing the Collateral or transfer of book-entry interests in the
         Pledged Securities as provided in subsection (a) of this Section 3, the
         Trustee shall establish an account  segregated from all other custodial
         or collateral  accounts for the deposit of the Pledged  Securities (the
         "Pledge Account") at its office at 4 Albany Street, New York, New York,
         10006, Attention:  Corporate Trustee Administration Department. Subject
         to the other terms and conditions of this Pledge  Agreement,  all funds
         or other  property  accepted  by the  Trustee  pursuant  to this Pledge

<PAGE>

         Agreement  shall be held in the Pledge  Account  for the benefit of the
         Trustee  and for the  ratable  benefit of the  Holders of the Notes and
         segregated from all other funds or other property otherwise held by the
         Trustee and all book-entry interests in the Pledged Securities shall be
         transferred  to and held in the Pledge  Account  for the benefit of the
         Trustee and for the ratable benefit of the Holders of the Notes.

                  (c) All interest earned on any Collateral shall be retained in
         the Pledge Account for the benefit of the Pledgor, pending disbursement
         pursuant to the terms hereof.

                  SECTION 4.  Disbursements.  (a)  Immediately  prior to the due
date of any of the first six  scheduled  interest  payments  on the  Notes,  the
Pledgor may, pursuant to an Issuer Order, direct the Trustee to release from the
Pledge  Account  proceeds  sufficient  to  provide  for  payment in full of such
interest  then due on the Notes.  Upon receipt of an Issuer  Order,  the Trustee
will take any action necessary to provide for the payment of the interest on the
Notes in accordance with the payment  provisions of the Indenture to the Holders
of the Notes from (and to the extent of) proceeds of the Pledged  Securities  in
the Pledge Account.  Nothing in this Section 4 shall affect the Trustee's rights
to apply the Pledged Securities to the payments of amounts due on the Notes upon
acceleration thereof.

                  (b) If the Pledgor makes any interest payment or portion of an
         interest payment for which the Pledged Securities are collateral from a
         source of funds other than the Pledge Account  ("Pledgor  Funds"),  the
         Pledgor may, after payment in full of such interest  payment or portion
         thereof from  proceeds of the Pledged  Securities or such Pledgor Funds
         or both,  direct the  Trustee  to release to the  Pledgor or to another
         party  at the  direction  of the  Pledgor  (the  "Pledgor's  Designee")
         proceeds from the Pledge Account in an amount less than or equal to the
         amount of Pledgor Funds applied to such interest payment.  Upon receipt
         of  an  Issuer  Order  by  the  Trustee  and  any  other  documentation
         reasonably  satisfactory  to the  Trustee to  substantiate  such use of
         Pledgor Funds by the Pledgor  (including the  certificate  described in
         the  following  sentence),  the Trustee will pay over to the Pledgor or
         the Pledgor's  Designee,  as the case may be, the requested amount from
         proceeds in the Pledge Account.  Concurrently with any release of funds
         to the Pledgor  pursuant to this Section 4(b), the Pledgor will deliver
         to the Trustee an Officers'  Certificate  stating that such release has
         been  duly  authorized  by the  Pledgor  and  will not  contravene  any
         provision of applicable law or the Certificate of  Incorporation of the
         Pledgor or any material agreement or other material  instrument binding
         upon the Pledgor or any of its  subsidiaries or any judgment,  order or
         decree of any governmental  body,  agency or court having  jurisdiction
         over the Pledgor or any of its  subsidiaries  or result in the creation
         or imposition of any Lien on any assets of the Pledgor,  except for the
         security interest granted under the Pledge Agreement.

                  (c) If at any  time  the  principal  of  and  interest  on the
         Pledged  Securities  held in the  Pledge  Account  exceeds  100% of the
         amount  sufficient,  in the written opinion of a nationally  recognized
         firm of independent  accountants  selected by the Pledgor and delivered
         to the  Trustee,  to  provide  for  payment  in full of the  first  six
         scheduled  interest  payments due on the Notes (or, in the event one or
         more interest payments have been 

<PAGE>

         made thereon,  an amount sufficient to provide for  the payment in full
         of any and all interest  payments on  the Notes then  remaining,  up to
         and including the sixth scheduled  interest  payment),  the Pledgor may
         direct  the  Trustee  to  release  any such  overfunded  amount to the
         Pledgor or to such  other party as the Pledgor may direct. Upon receipt
         of an Issuer Order and  any other documentation reasonably satisfactory
         to the Trustee to  substantiate such excess, the Trustee shall pay over
         to the Pledgor or the  Person  designated  by the Pledgor,  as the case
         may be, any such overfunded amount.

                  (d) Upon payment in full of the first six  scheduled  interest
         payments on the Notes in a timely manner,  the security interest in the
         Collateral  evidenced  by  this  Pledge  Agreement  will  automatically
         terminate and be of no further force and effect. Furthermore,  upon the
         release of any Collateral  from the Pledge  Account in accordance  with
         the terms of this Pledge Agreement,  whether upon release of Collateral
         to Holders as payment of interest or otherwise,  the security  interest
         evidenced by this Pledge  Agreement in such  released  Collateral  will
         automatically terminate and be of no further force and effect.

                  (e) The  Pledgor  covenants  to give the  Trustee at least one
         Business  Day's  notice  (by  Issuer  Order) as to  whether  payment of
         interest  will be made  pursuant to Section  4(a) or 4(b) and as to the
         respective  amounts of interest  that will be paid  pursuant to Section
         4(a) or 4(b). If no such notice is given, the Trustee will act pursuant
         to Section 4(a) as if it had received an Issuer Order pursuant  thereto
         for the payment in full of the interest then due.

                  (f) The Trustee shall not be required to liquidate any Pledged
         Security  in order to make any  scheduled  payment of  interest  or any
         release hereunder unless instructed to do so by Issuer Order.

                  SECTION 5. Representations and Warranties.  The Pledgor hereby
represents and warrants that:

                  (a) The  execution  and  delivery  by the  Pledgor of, and the
         performance  by the  Pledgor  of its  obligations  under,  this  Pledge
         Agreement  will not  contravene  any provision of applicable law or the
         Certificate of Incorporation  of the Pledgor or any material  agreement
         or other  material  instrument  binding  upon the Pledgor or any of its
         subsidiaries or any judgment, order or decree of any governmental body,
         agency or court  having  jurisdiction  over the  Pledgor  or any of its
         subsidiaries,  or result in the creation or  imposition  of any Lien on
         any assets of the  Pledgor,  except for the security  interest  granted
         under this Pledge  Agreement;  no consent,  approval,  authorization or
         order of, or  qualification  with, any  governmental  body or agency is
         required  for (i) the  performance  by the  Pledgor of its  obligations
         under this  Pledge  Agreement,  (ii) the  pledge by the  Pledgor of the
         Collateral  pursuant to this Pledge  Agreement or (iii) the exercise by
         the Trustee of the rights provided for in this Pledge  Agreement or the
         remedies  in  respect  of  the  Collateral   pursuant  to  this  Pledge
         Agreement.
<PAGE>

                  (b) The  Pledgor is the  beneficial  owner of the  Collateral,
         free and clear of any Lien or claims  of any  person or entity  (except
         for the security  interests  granted under this Pledge  Agreement).  No
         financing  statement  covering the Pledged Securities is on file in any
         public  office  other  than the  financing  statements,  if any,  filed
         pursuant to this Pledge Agreement.

                  (c) This Pledge  Agreement has been duly  authorized,  validly
         executed  and   delivered  by  the  Pledgor  and   (assuming   the  due
         authorization and valid execution and delivery of this Pledge Agreement
         by the Trustee and  enforceability  of the Pledge Agreement against the
         Trustee in accordance  with its terms)  constitutes a valid and binding
         agreement of the Pledgor, enforceable against the Pledgor in accordance
         with its terms, except as (i) the enforceability  hereof may be limited
         by   bankruptcy,   insolvency,   fraudulent   conveyance,   preference,
         reorganization,  moratorium  or similar laws now or hereafter in effect
         relating to or affecting creditors' rights or remedies generally,  (ii)
         the  availability  of  equitable  remedies  may be limited by equitable
         principles  of general  applicability  and the  discretion of the court
         before which any  proceeding  therefor may be brought,  (iii) rights to
         indemnification  hereunder  may be  limited by U.S.  federal  and state
         securities laws and public policy considerations and (iv) the waiver of
         rights and  defenses  contained  in Section  12(b),  Section  15.11 and
         Section 15.16 hereof may be limited by applicable law.

                  (d) Upon the  delivery to the Trustee of the  certificates  or
         instruments, if any, representing or evidencing the Pledged Securities,
         the filing of  financing  statements,  if any,  required by the Uniform
         Commercial Code (the "UCC") in the appropriate  offices in the State of
         New  York,  and upon the  transfer  by the  Trustee  in its  individual
         capacity and the due  recording in the books and records of the Trustee
         in its  capacity  as trustee  hereunder  of  interests  in the  Pledged
         Securities  to and in the name of the  Trustee  for its benefit and the
         ratable  benefit of the Holders of the Notes and the due  recording  by
         the Trustee in its books and  records  that the Pledgor has pledged and
         granted a security interest in such interests in the Pledged Securities
         to the  Trustee  on behalf of itself  and the  holders of the Notes and
         receipt by the Trustee and the Pledgor of written  confirmation thereof
         in the form of Exhibit A hereto,  the pledge of and grant of a security
         interest in the Collateral  securing the payment of the Obligations for
         the benefit of the Trustee and the Holders of the Notes will constitute
         a first  priority  perfected  security  interest  in  such  Collateral,
         enforceable  as such  against  all  creditors  of the  Pledgor  and any
         persons  purporting to purchase any of the Collateral from the Pledgor,
         other than as permitted by the Indenture.

                  (e) There are no legal or governmental proceedings pending or,
         to the best of the Pledgor's knowledge, threatened to which the Pledgor
         or any of its subsidiaries is a party or to which any of the properties
         of the Pledgor or any such subsidiary is subject that would  materially
         adversely  affect the power or ability  of the  Pledgor to perform  its
         obligations   under  this  Pledge   Agreement  or  to  consummate   the
         transactions contemplated hereby.
<PAGE>

                  (f) The  pledge  of the  Collateral  pursuant  to this  Pledge
         Agreement  is not  prohibited  by any  applicable  law or  governmental
         regulation,   release,  interpretation  or  opinion  of  the  Board  of
         Governors  of the Federal  Reserve  System or other  regulatory  agency
         (including, without limitation,  Regulations G, T, U and X of the Board
         of Governors of the Federal Reserve System).

                  (g)      No Event of Default exists.

                  SECTION 6. Further Assurances. The Pledgor will, promptly upon
request  by the  Trustee,  execute  and  deliver  or  cause to be  executed  and
delivered,  or use its  reasonable  best efforts to procure,  all stock  powers,
proxies, assignments, instruments and other documents, all in form and substance
reasonably  satisfactory to the Trustee,  deliver any instruments to the Trustee
and take any other actions that are necessary or, in the  reasonable  opinion of
the Trustee,  desirable to perfect,  continue the  perfection of, or protect the
first priority of the Trustee's  security interest in and to the Collateral,  to
protect the Collateral against the rights, claims, or interests of third persons
or to effect the  purposes of this  Pledge  Agreement.  The Pledgor  also hereby
authorizes the Trustee to file any financing or  continuation  statements in the
United  States  with  respect to the  Collateral  without the  signature  of the
Pledgor (to the extent  permitted by applicable  law). The Pledgor will promptly
pay all reasonable costs incurred in connection with any of the foregoing within
45 days of receipt of an invoice therefor.  The Pledgor also agrees,  whether or
not requested by the Trustee,  to take all actions that are necessary to perfect
or  continue  the  perfection  of, or to  protect  the first  priority  of,  the
Trustee's  security  interest in and to the Collateral,  including the filing of
all  necessary  financing  and  continuation  statements,  and  to  protect  the
Collateral against the rights, claims or interests of third persons.

                  SECTION 7.  Covenants.  The Pledgor  covenants and agrees with
the  Trustee and the Holders of the Notes from and after the date of this Pledge
Agreement  until the earlier of payment in full in cash of (x) each of the first
six  scheduled  interest  payments  due on the  Notes  under  the  terms  of the
Indenture or (y) all obligations due and owing under the Indenture and the Notes
in the event such obligations become due and payable prior to the payment of the
first six scheduled interest payments on the Notes:

                  (a) that it will  not (i) sell or  otherwise  dispose  of,  or
         grant any option or warrant with respect to, any of the  Collateral  or
         (ii) create or permit to exist any Lien upon or with  respect to any of
         the  Collateral  (except for the Lien  created  pursuant to this Pledge
         Agreement)  and at all times will be the sole  beneficial  owner of the
         Collateral; or

                  (b)  that  it  will  not  (i)  enter  into  any  agreement  or
         understanding that purports to or may restrict or inhibit the Trustee's
         rights  or  remedies  hereunder,  including,  without  limitation,  the
         Trustee's right to sell or otherwise  dispose of the Collateral or (ii)
         fail to pay or discharge any tax, assessment or levy of any nature with
         respect to the Collateral not later than five days prior to the date of
         any proposed  sale under any  judgment,  writ or warrant of  attachment
         with respect to the Collateral.
<PAGE>

                  SECTION 8. Power of Attorney. In addition to all of the powers
granted to the Trustee  pursuant to the Indenture,  the Pledgor hereby  appoints
and constitutes the Trustee as the Pledgor's  attorney-in-fact  (with full power
of  substitution)  to exercise to the fullest extent permitted by law all of the
following  powers  upon and at any time  after the  occurrence  and  during  the
continuance  of  an  Event  of  Default;  (a)  collection  of  proceeds  of  any
Collateral;  (b) conveyance of any item of Collateral to any purchaser  thereof;
(c) giving of any notices or recording of any Liens under Section 6 hereof:  (d)
making of any payments or taking any acts under  Section 9 hereof and (e) paying
or discharging taxes or Liens levied or placed upon the Collateral, the legality
or validity  thereof  and the  amounts  necessary  to  discharge  the same to be
determined by the Trustee in its sole reasonable  discretion,  and such payments
made by the  Trustee to become  part of the  Obligations  of the  Pledgor to the
Trustee,  due and payable immediately upon demand. The Trustee's authority under
this Section 8 shall include,  without limitation,  the authority to endorse and
negotiate any checks or instruments  representing  proceeds of Collateral in the
name of the Pledgor,  execute and give receipt for any  certificate of ownership
or  any  document  constituting  Collateral,  transfer  title  to  any  item  of
Collateral,  sign the Pledgor's name on all financing  statements (to the extent
permitted  by  applicable  law)  or any  other  documents  deemed  necessary  or
appropriate by the Trustee to preserve, protect or perfect the security interest
in the  Collateral  and to file the same,  prepare,  file and sign the Pledgor's
name on any  notice  of Lien,  and to take any  other  actions  arising  from or
incident to the powers  granted to the Trustee in this  Pledge  Agreement.  This
power of attorney is coupled with an interest and is irrevocable by the Pledgor.

                  SECTION  9.  Trustee  May  Perform.  If the  Pledgor  fails to
perform any agreement contained herein, the Trustee may itself perform, or cause
the performance of, such agreement,  and the reasonable  expenses of the Trustee
incurred in connection  therewith  shall be payable by the Pledgor under Section
13 hereof.

                  SECTION 10. No  Assumption  of Duties;  Reasonable  Care.  The
rights and powers granted to the Trustee hereunder are being granted in order to
preserve  and  protect the  Trustee's  and the  Holders'  of the Notes  security
interest in and to the  Collateral  granted  hereby and shall not be interpreted
to, and shall not impose any duties on the Trustee in connection therewith other
than those expressly  provided herein or imposed under applicable law. Except as
provided  by  applicable  law,  the  Trustee  shall be deemed to have  exercised
reasonable  care  in the  custody  and  preservation  of the  Collateral  in its
possession if the Collateral is accorded treatment  substantially  equal to that
which the  Trustee  accords  similar  property in similar  situations,  it being
understood  that  the  Trustee  shall  not  have  any   responsibility  for  (a)
ascertaining  or taking  action with respect to calls,  conversions,  exchanges,
maturities  or other  matters  relative  to any  Collateral,  whether or not the
Trustee  has or is deemed to have  knowledge  of such  matters,  (b)  taking any
necessary  steps to preserve  rights  against any  parties  with  respect to any
Collateral or (c) investing or reinvesting any of the Collateral.

                  SECTION 11.  Indemnity.  The  Pledgor  shall  indemnify,  hold
harmless  and  defend  the  Trustee  and its  directors,  officers,  agents  and
employees,   from  and  against  any  and  all  claims,  actions,   obligations,
liabilities  and  expenses,   including  reasonable  defense  costs,  reasonable
investigative fees and costs, and reasonable legal fees and damages arising from
the Trustee's 


<PAGE>

performance under this Pledge  Agreement,  except to the extent that such claim,
action,  obligation,  liability or expense is directly  attributable  to the bad
faith, gross negligence or wilful misconduct of such indemnified person.

                  SECTION 12.  Remedies  Upon Event of Default.  If any Event of
Default under the Indenture or default  hereunder  (any such Event of Default or
default  being  referred to in this Pledge  Agreement  as an "Event of Default")
shall have occurred and be continuing:

                  (a) The Trustee  and the  Holders of the Notes shall have,  in
         addition to all other rights  given by law or by this Pledge  Agreement
         or the  Indenture,  all of the rights and remedies  with respect to the
         Collateral  of a secured  party under the UCC in effect in the State of
         New York at that time. In addition, with respect to any Collateral that
         shall  then be in or  shall  thereafter  come  into the  possession  or
         custody of the  Trustee,  the  Trustee may sell or cause the same to be
         sold at any broker's board or at public or private sale, in one or more
         sales or lots,  at such price or prices as the  Trustee  may deem best,
         for cash or on credit or for future delivery, without assumption of any
         credit  risk.  The  purchaser  of any or all  Collateral  so sold shall
         thereafter hold the same absolutely,  free from any claim,  encumbrance
         or right of any kind  whatsoever  created  by or through  the  Pledgor.
         Unless any of the Collateral  threatens,  in the reasonable judgment of
         the  Trustee,  to decline  speedily in value or is or becomes of a type
         sold  on a  recognized  market,  the  Trustee  will  give  the  Pledgor
         reasonable notice of the time and place of any public sale thereof,  or
         of the time after which any private sale or other intended  disposition
         is to be made. Any sale of the Collateral  conducted in conformity with
         reasonable   commercial   practices  of  banks,   insurance  companies,
         commercial finance companies, or other financial institutions disposing
         of  property   similar  to  the  Collateral   shall  be  deemed  to  be
         commercially reasonable. Any requirements of reasonable notice shall be
         met if such notice is mailed to the Pledgor as provided in Section 15.1
         hereof  at  least  ten  (10)  days  before  the  time  of the  sale  or
         disposition. The Trustee or any Holder of Notes may, in its own name or
         in the name of a designee or nominee,  buy any of the Collateral at any
         public sale and, if permitted by  applicable  law, at any private sale.
         All expenses  (including  court costs and reasonable  attorneys'  fees,
         expenses and  disbursements) of, or incident to, the enforcement of any
         of the provisions  hereof shall be recoverable from the proceeds of the
         sale or other disposition of the Collateral.

                  (b) The  Pledgor  further  agrees to use its  reasonable  best
         efforts  to do or  cause  to be  done  all  such  other  acts as may be
         necessary  to make  such  sale or  sales of all or any  portion  of the
         Collateral  pursuant  to this  Section  12  valid  and  binding  and in
         compliance with any and all other  applicable  requirements of law. The
         Pledgor further agrees that a breach of any of the covenants  contained
         in this Section 12 will cause irreparable injury to the Trustee and the
         Holders of the Notes,  that the  Trustee  and the  Holders of the Notes
         have no  adequate  remedy at law in respect of such  breach  and,  as a
         consequence,  that each and every covenant contained in this Section 12
         shall be specifically  enforceable against the Pledgor, and the Pledgor
         hereby  waives and agrees not to assert any defenses  against an action
         for specific performance of such covenants except for a defense that no
         Event of Default has occurred.

<PAGE>

                  SECTION 13. Expenses.  The Pledgor will upon demand pay to the
Trustee  the  amount  of any and all  reasonable  expenses,  including,  without
limitation,  the reasonable  fees,  expenses and  disbursements  of its counsel,
experts  and agents  retained  by the  Trustee,  that the  Trustee  may incur in
connection with (a) the review,  negotiation and  administration  of this Pledge
Agreement,  (b) the custody or preservation of, or the sale of, collection from,
or  other  realization  upon,  any  of  the  Collateral,  (c)  the  exercise  or
enforcement  of any of the rights of the  Trustee  and the  Holders of the Notes
hereunder  or (d) the  failure by the  Pledgor to perform or observe  any of the
provisions  hereof. The lien in favor of the Trustee created by Section 10.01 of
the Indenture  shall in addition to securing the Pledgor's  payment  obligations
under such Section 10.01 secure the Pledgor's payment  obligations under Section
11 and 13 hereof.

                  SECTION  14.  Security  Interest  Absolute.  All rights of the
Trustee and the Holders of the Notes and security interests  hereunder,  and all
obligations  of the  Pledgor  hereunder,  shall be  absolute  and  unconditional
irrespective of:

                  (a) any lack of validity or enforceability of the Indenture or
         any other agreement or instrument relating thereto;

                  (b) any change in the time,  manner or place of payment of, or
         in any  other  term of,  all or any of the  Obligations,  or any  other
         amendment  or  waiver  of or any  consent  to any  departure  from  the
         Indenture;

                  (c) any exchange,  surrender, release or non-perfection of any
         Liens on any other collateral for all or any of the Obligations; or

                  (d) to the  extent  permitted  by  applicable  law,  any other
         circumstance  which might otherwise  constitute a defense available to,
         or a discharge of, the Pledgor in respect of the Obligations or of this
         Pledge Agreement.

                  SECTION 15.  Miscellaneous Provisions.

                  Section 15.1.  Notices.  All notices,  approvals,  consents or
other  communications  required or desired to be given hereunder shall be in the
form and manner, and delivered to each of the parties hereto at their respective
addresses, as set forth or provided for in Section 12.02 of the Indenture.

                  Section 15.2. No Adverse  Interpretation  of Other Agreements.
This Pledge Agreement may not be used to interpret  another pledge,  security or
debt  agreement  of the  Pledgor  or any  subsidiary  thereof.  No such  pledge,
security or debt agreement may be used to interpret this Pledge Agreement.

                  Section  15.3.  Severability.  The  provisions  of this Pledge
Agreement are severable,  and if any clause or provision  shall be held invalid,
illegal  or  unenforceable  in whole or in part in any  jurisdiction,  then such
invalidity  or  unenforceability  shall  affect in that  jurisdiction  only such
clause or provision,  or part  thereof,  and shall not in any manner affect such
clause or


<PAGE>

provision  in any other  jurisdiction  or any other  clause or provision of this
Pledge Agreement in any jurisdiction.

                  Section 15.4. Headings.  The headings in this Pledge Agreement
have been inserted for convenience of reference only, are not to be considered a
part  hereof  and  shall  in no way  modify  or  restrict  any of the  terms  or
provisions hereof.

                  Section 15.5. Counterpart Originals. This Pledge Agreement may
be  signed  in two or more  counterparts,  each of  which  shall  be  deemed  an
original, but all of which shall together constitute one and the same agreement.

                  Section 15.6.  Benefits of Pledge  Agreement.  Nothing in this
Pledge Agreement,  express or implied,  shall give to any person, other than the
parties hereto and their successors hereunder, and the Holders of the Notes, any
benefit or any legal or  equitable  right,  remedy or claim  under  this  Pledge
Agreement.

                  Section 15.7. Amendments,  Waivers and Consents. Any amendment
or waiver of any  provision  of this  Pledge  Agreement  and any  consent to any
departure by the Pledgor from any  provision of this Pledge  Agreement  shall be
effective  only if made or duly  given in  compliance  with all of the terms and
provisions  of the  Indenture,  and  neither the Trustee nor any Holder of Notes
shall be deemed, by any act, delay,  indulgence,  omission or otherwise, to have
waived any right or remedy  hereunder  or to have  acquiesced  in any Default or
Event of  Default or in any  breach of any of the terms and  conditions  hereof.
Failure  of the  Trustee  or any  Holder  of  Notes  to  exercise,  or  delay in
exercising, any right, power or privilege hereunder shall not preclude any other
or  further  exercise  thereof  or the  exercise  of any other  right,  power or
privilege. A waiver by the Trustee or any Holder of Notes of any right or remedy
hereunder  on any one  occasion  shall not be construed as a bar to any right or
remedy  that the Trustee or such  Holder of Notes  would  otherwise  have on any
future occasion. The rights and remedies herein provided are cumulative,  may be
exercised singly or concurrently and are not exclusive of any rights or remedies
provided by law.

                  Section  15.8.  Interpretation  of  Agreement.  All  terms not
defined  herein or in the  Indenture  shall  have the  meaning  set forth in the
applicable UCC,  except where the context  otherwise  requires.  To the extent a
term or provision of this Pledge  Agreement  conflicts with the  Indenture,  the
Indenture  shall  control  with  respect to the  subject  matter of such term or
provision.  Acceptance of or  acquiescence  in a course of performance  rendered
under this Pledge  Agreement  shall not be relevant to determine  the meaning of
this  Pledge  Agreement  even  though the  accepting  or  acquiescing  party had
knowledge of the nature of the performance and opportunity for objection.

                  Section 15.9. Continuing Security Interest;  Termination.  (a)
This Pledge Agreement shall create a continuing  security interest in and to the
Collateral  and shall,  unless  otherwise  provided in the  Indenture or in this
Pledge  Agreement,  remain in full force and effect until the earlier of payment
in full in cash of (i) each of the first six scheduled  interest payments due on
the Notes under the terms of the Indenture or (ii) all obligations due and owing
under the


<PAGE>

Indenture and the Notes in the event such  obligations  become  payable prior to
the payment of the first six  scheduled  interest  payments  on the Notes.  This
Pledge Agreement shall be binding upon the Pledgor, its transferees,  successors
and  assigns,  and shall  inure,  together  with the rights and  remedies of the
Trustee hereunder,  to the benefit of the Trustee,  the Holders of the Notes and
their respective successors, transferees and assigns.

                  (b) Subject to the  provisions of Section  15.10 hereof,  this
         Pledge Agreement shall terminate upon the earlier of payment in full in
         cash of (i) each of the first six  scheduled  interest  payments due on
         the Notes under the terms of the Indenture or (ii) all  obligations due
         and  owing  under  the  Indenture  and  the  Notes  in the  event  such
         obligations  become  payable  prior to the  payment  of the  first  six
         scheduled  interest  payments on the Notes.  At such time,  the Trustee
         shall,  pursuant to an Issuer  Order,  reassign  and  redeliver  to the
         Pledgor  all of the  Collateral  hereunder  that  has  not  been  sold,
         disposed of,  retained or applied by the Trustee in accordance with the
         terms of this Pledge Agreement and the Indenture. Such reassignment and
         redelivery  shall be without  warranty by or  recourse to the  Trustee,
         except as to the absence of any prior assignments by the Trustee of its
         interest in the Collateral,  and shall be at the reasonable  expense of
         the Pledgor.

                  Section  15.10.  Survival  Provisions.   All  representations,
warranties  and  covenants of the Pledgor  contained  herein  shall  survive the
execution and delivery of this Pledge  Agreement,  and shall terminate only upon
the termination of this Pledge  Agreement.  The obligations of the Pledgor under
Sections 11 and 13 hereof shall survive the termination of this Agreement.

                  Section 15.11.  Waivers.  The Pledgor waives  presentment  and
demand for payment of any of the Obligations,  protest and notice of dishonor or
default with respect to any of the  Obligations,  and all other notices to which
the Pledgor might otherwise be entitled,  except as otherwise expressly provided
herein or in the Indenture.

                  Section 15.12. Authority of the Trustee. (a) The Trustee shall
have and be entitled  to exercise  all powers  hereunder  that are  specifically
granted to the  Trustee by the terms  hereof,  together  with such powers as are
reasonably incident thereto. The Trustee may perform any of its duties hereunder
or in connection with the Collateral by or through agents or employees and shall
be entitled to retain  counsel and to act in reliance upon the advice of counsel
concerning  all such  matters.  Neither the Trustee nor any  director,  officer,
employee,  attorney or agent of the  Trustee  shall be liable to the Pledgor for
any action taken or omitted to be taken by it hereunder,  except for its own bad
faith,  gross  negligence  or wilful  misconduct,  and the Trustee  shall not be
responsible  for the validity,  effectiveness  or  sufficiency  hereof or of any
document or security  furnished  pursuant hereto. The Trustee and its directors,
officers,  employees,  attorneys  and agents  shall be  entitled  to rely on any
communication,  instrument or document  believed by it or them to be genuine and
correct and to have been signed or sent by the proper person or persons.

                  (b)   The   Pledgor   acknowledges   that   the   rights   and
         responsibilities  of the  Trustee  under  this  Pledge  Agreement  with
         respect  to  any  action  taken  by the  Trustee  or  the  exercise  or
         non-exercise by the Trustee of any option, right, request,  judgment or
         other 
<PAGE>

         right  or  remedy  provided  for  herein  or  resulting  or arising out
         of this Pledge  Agreement shall, as between the Trustee and the Holders
         of the Notes, be governed by the Indenture and by such other agreements
         with respect thereto as may exist from time to time among them, but, as
         between the Trustee and the Pledgor,  the Trustee shall be conclusively
         presumed  to be acting as agent for the  Holders of the Notes with full
         and valid  authority so to act or refrain from acting,  and the Pledgor
         shall not be obligated or entitled to make any inquiry  respecting such
         authority.

                  Section  15.13.  Limitation  by Law. All rights,  remedies and
powers  provided  herein may be exercised  only to the extent that they will not
render this Pledge  Agreement  not entitled to be recorded,  registered or filed
under provisions of any applicable law.

                  Section  15.14.  Final  Expression.   This  Pledge  Agreement,
together with any other agreement executed in connection  herewith,  is intended
by the parties as a final expression of this Pledge Agreement and is intended as
a complete and exclusive statement of the terms and conditions thereof.

                  Section  15.15.  Rights of Holders of the Notes.  No Holder of
Notes  shall have any  independent  rights  hereunder  other  than those  rights
granted to  individual  Holders  of the Notes  pursuant  to Section  6.06 of the
Indenture;  provided  that  nothing in this  subsection  shall  limit any rights
granted to the Trustee under the Notes or the Indenture.

                  Section  15.16.  GOVERNING  LAW;  SUBMISSION TO  JURISDICTION;
WAIVER OF JURY TRIAL;  WAIVER OF DAMAGES.  (a) THIS  PLEDGE  AGREEMENT  SHALL BE
GOVERNED  BY AND  INTERPRETED  UNDER THE LAWS OF THE STATE OF NEW YORK,  AND ANY
DISPUTE  ARISING  OUT OF,  CONNECTED  WITH,  RELATED  TO, OR  INCIDENTAL  TO THE
RELATIONSHIP ESTABLISHED BETWEEN THE PLEDGOR, THE TRUSTEE AND THE HOLDERS OF THE
NOTES IN CONNECTION WITH THIS PLEDGE AGREEMENT, AND WHETHER ARISING IN CONTRACT,
TORT, EQUITY OR OTHERWISE,  SHALL BE RESOLVED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK.

                  (b) THE  PLEDGOR HAS  APPOINTED  [NAME OF AGENT FOR SERVICE OF
PROCESS], [ADDRESS OF AGENT FOR SERVICE OF PROCESS], AS ITS AGENT FOR SERVICE OF
PROCESS IN ANY SUIT, ACTION OR PROCEEDING WITH RESPECT TO THIS AGREEMENT AND FOR
ACTIONS  BROUGHT  UNDER U.S.  FEDERAL OR STATE  SECURITIES  LAWS  BROUGHT IN ANY
FEDERAL OR STATE  COURT  LOCATED IN THE CITY OF NEW YORK AND AGREES TO SUBMIT TO
THE JURISDICTION OF ANY SUCH COURT.

                  (c) THE PLEDGOR AGREES THAT THE TRUSTEE SHALL, IN ITS CAPACITY
AS TRUSTEE OR IN THE NAME AND ON BEHALF OF ANY HOLDER OF NOTES,  HAVE THE RIGHT,
TO THE EXTENT PERMITTED BY APPLICABLE LAW, TO PROCEED AGAINST THE PLEDGOR OR ITS
PROPERTY  IN A COURT IN ANY  LOCATION  REASONABLY  SELECTED  IN GOOD  FAITH (AND
HAVING PERSONAL OR


<PAGE>

IN REM  JURISDICTION  OVER THE PLEDGOR OR ITS  PROPERTY,  AS THE CASE MAY BE) TO
ENABLE THE  TRUSTEE TO REALIZE  ON SUCH  PROPERTY,  OR TO ENFORCE A JUDGMENT  OR
OTHER COURT ORDER  ENTERED IN FAVOR OF THE TRUSTEE.  THE PLEDGOR  AGREES THAT IT
WILL NOT ASSERT ANY  COUNTERCLAIMS,  SETOFFS OR  CROSSCLAIMS  IN ANY  PROCEEDING
BROUGHT BY THE  TRUSTEE TO REALIZE ON SUCH  PROPERTY OR TO ENFORCE A JUDGMENT OR
OTHER  COURT  ORDER IN  FAVOR OF THE  TRUSTEE,  EXCEPT  FOR SUCH  COUNTERCLAIMS,
SETOFFS OR CROSSCLAIMS WHICH, IF NOT ASSERTED IN ANY SUCH PROCEEDING,  COULD NOT
OTHERWISE BE BROUGHT OR ASSERTED.  THE PLEDGOR  WAIVES ANY OBJECTION THAT IT MAY
HAVE TO THE  LOCATION  OF THE COURT IN THE CITY OF NEW YORK ONCE THE TRUSTEE HAS
COMMENCED  A  PROCEEDING   DESCRIBED  IN  THIS  PARAGRAPH   INCLUDING,   WITHOUT
LIMITATION,  ANY  OBJECTION  TO THE  LAYING OF VENUE OR BASED ON THE  GROUNDS OF
FORUM NON CONVENIENS.

                  (d) THE PLEDGOR AND THE TRUSTEE EACH WAIVE ANY RIGHT TO HAVE A
JURY PARTICIPATE IN RESOLVING ANY DISPUTE, WHETHER ARISING IN CONTRACT, TORT, OR
OTHERWISE  ARISING  OUT OF,  CONNECTED  WITH,  RELATED TO OR  INCIDENTAL  TO THE
RELATIONSHIP  ESTABLISHED BETWEEN THEM IN CONNECTION WITH THIS PLEDGE AGREEMENT.
INSTEAD,  ANY  DISPUTES  RESOLVED  IN COURT WILL BE  RESOLVED  IN A BENCH  TRIAL
WITHOUT A JURY.

                  (e) THE PLEDGOR AGREES THAT NEITHER THE TRUSTEE NOR ANY HOLDER
OF NOTES  SHALL HAVE ANY  LIABILITY  TO THE  PLEDGOR  (WHETHER  ARISING IN TORT,
CONTRACT OR OTHERWISE)  FOR LOSSES  SUFFERED BY THE PLEDGOR IN CONNECTION  WITH,
ARISING OUT OF, OR IN ANY WAY RELATED TO, THE TRANSACTIONS  CONTEMPLATED AND THE
RELATIONSHIP ESTABLISHED BY THIS PLEDGE AGREEMENT, OR ANY ACT, OMISSION OR EVENT
OCCURRING  IN  CONNECTION  THEREWITH,  UNLESS  IT IS  DETERMINED  BY A FINAL AND
NONAPPEALABLE  JUDGMENT OF A COURT THAT IS BINDING ON THE TRUSTEE OR SUCH HOLDER
OF  NOTES,  AS THE CASE MAY BE,  THAT  SUCH  LOSSES  WERE THE  RESULT OF ACTS OR
OMISSIONS ON THE PART OF THE TRUSTEE OR SUCH  HOLDERS OF NOTES,  AS THE CASE MAY
BE, CONSTITUTING BAD FAITH, GROSS NEGLIGENCE OR WILLFUL MISCONDUCT.

                  (f) TO THE EXTENT  PERMITTED BY APPLICABLE  LAW, AND EXCEPT AS
OTHERWISE  PROVIDED IN THIS PLEDGE  AGREEMENT,  THE PLEDGOR WAIVES ALL RIGHTS OF
NOTICE  AND  HEARING  OF ANY KIND PRIOR TO THE  EXERCISE  BY THE  TRUSTEE OR ANY
HOLDER OF NOTES OF ITS RIGHTS DURING THE CONTINUANCE OF ALL EVENTS OF DEFAULT TO
REPOSSESS THE  COLLATERAL  WITH JUDICIAL  PROCESS OR TO REPLEVY,  ATTACH OR LEVY
UPON THE  COLLATERAL  OR  OTHER  SECURITY  FOR THE  OBLIGATIONS.  TO THE  EXTENT
PERMITTED  BY  APPLICABLE  LAW,  THE  PLEDGOR  WAIVES  THE  POSTING  OF ANY BOND
OTHERWISE  REQUIRED OF THE TRUSTEE OR ANY HOLDER OF NOTES IN CONNECTION WITH ANY
JUDICIAL PROCESS OR PROCEEDING TO OBTAIN  POSSESSION OF REPLEVY,  ATTACH OR LEVY
UPON THE  COLLATERAL  OR OTHER  


<PAGE>

SECURITY  FOR THE  OBLIGATIONS,  TO ENFORCE  ANY  JUDGMENT  OR OTHER COURT ORDER
ENTERED  IN FAVOR OF THE  TRUSTEE  OR ANY  HOLDER OF  NOTES,  OR TO  ENFORCE  BY
SPECIFIC  PERFORMANCE,  TEMPORARY  RESTRAINING ORDER OR PRELIMINARY OR PERMANENT
INJUNCTION, THIS PLEDGE AGREEMENT OR ANY OTHER AGREEMENT OR DOCUMENT BETWEEN THE
PLEDGOR ON THE ONE HAND AND THE  TRUSTEE  AND/OR THE HOLDERS OF THE NOTES ON THE
OTHER HAND.

                            [SIGNATURE PAGE FOLLOWS]


<PAGE>


                  IN WITNESS  WHEREOF,  the Pledgor  and the  Trustee  have each
caused this Pledge  Agreement to be duly  executed and  delivered as of the date
first above written.


           Pledgor:


                                 ORION NEWCO SERVICES, INC.


                                  By:____________________________

                                  Name:__________________________

                                  Title:_________________________

           Trustee:



                                  BANKERS TRUST COMPANY,
                                       as Trustee


                                  By:____________________________

                                  Name:__________________________

                                  Title:_________________________


<PAGE>





                                                                EXHIBIT A TO THE
                                                               COLLATERAL PLEDGE
                                                          AND SECURITY AGREEMENT



Orion Newco Services, Inc.
2440 Research Boulevard
Suite 40
Rockville, Maryland 20850
Attention: [___________________]

Bankers Trust Company,
  as Trustee
4 Albany Street
New York, New York 10006
Attention:  Corporate Trustee Administration Department

Ladies and Gentlemen:

                  Reference is made to the Indenture dated as [__________], 1997
between  Orion  Newco  Services,  Inc.,  as issuer (the  "Issuer"),  each of the
Issuer's Restricted  Subsidiaries (as defined in the Indenture),  as guarantors,
and Bankers Trust Company,  as trustee  thereunder (the "Trustee"),  relating to
the [___]% Senior Notes due 2007 of the Issuer (the "Notes") and the  Collateral
Pledge  and  Security  Agreement  dated as of  [__________],  1997 (the  "Pledge
Agreement")  between the Issuer and the Trustee,  for the benefit of the Trustee
and the ratable benefit of the holders of the Notes.

                  We hereby  confirm that we are holding the Pledged  Securities
(as  defined in the Pledge  Agreement)  in account  no.  [Account  Number]  (the
"Account") at our office at 4 Albany Street,  New York, New York, 10006, for the
benefit of the Trustee  and the  ratable  benefit of the holders of the Notes as
provided  in the Pledge  Agreement  and that we have  indicated  the same in our
books and records relating to the Pledged Securities and the Account.

                                 Very truly yours,

                                 BANKERS TRUST COMPANY,
                                   in its individual capacity


                                  By:____________________________

                                  Name:__________________________

                                  Title:_________________________

                                                                       S&S DRAFT
                                                                        01/20/97




                                WARRANT AGREEMENT



                                     between



                           ORION NEWCO SERVICES, INC.



                                       and



                             BANKERS TRUST COMPANY,

                                  Warrant Agent








                         Dated as of [___________], 1997




<PAGE>
<TABLE>
<CAPTION>

                                TABLE OF CONTENTS

                                                                                                               Page

                                    ARTICLE I
                               CERTAIN DEFINITIONS


                                   ARTICLE II
                           ORIGINAL ISSUE OF WARRANTS

<S>               <C>                                                                                          <C>
      Section 2.1.  Form of Warrant Certificates................................................................  5
      Section 2.2.  Legends.....................................................................................  6
       Section 2.3.  Execution and Delivery of Warrant Certificates..............................................  7
      Section 2.4.  Transfer and Exchange.......................................................................  7
      Section 2.5.  Surrender of Warrant Certificates........................................................... 10


                                   ARTICLE III
               EXERCISE PRICE; EXERCISE AND REPURCHASE OF WARRANTS

      Section 3.1.  Exercise Price.............................................................................. 10
      Section 3.2.  Exercise; Restrictions on Exercise.......................................................... 10
      Section 3.3.  Method of Exercise; Payment of Exercise Price............................................... 11
      Section 3.4.  Repurchase Offers........................................................................... 12

                                   ARTICLE IV
                                   ADJUSTMENTS

      Section 4.1.  Adjustments................................................................................. 15
      Section 4.2.  Notice of Adjustment........................................................................ 22
      Section 4.3.  Statement on Warrants....................................................................... 22
       Section 4.4.  Notice of Consolidation, Merger, Etc........................................................ 22
      Section 4.5.  Fractional Interests........................................................................ 23
 
                                    ARTICLE V
                           DECREASE IN EXERCISE PRICE

                                   ARTICLE VI
                               LOSS OR MUTILATION

                                   ARTICLE VII
                          AUTHORIZATION AND RESERVATION
                                OF COMMON SHARES



<PAGE>


                                       ii

                                                                                                               Page

                                  ARTICLE VIII
                                 WARRANT HOLDERS

      Section 8.1.  Warrant Holder Not Deemed a Stockholder..................................................... 24
      Section 8.2.  Right of Action............................................................................. 25

                                   ARTICLE IX
                                    REMEDIES

      Section 9.1.  Defaults.................................................................................... 25
      Section 9.2.  Payment Obligations......................................................................... 25
      Section 9.3.  Remedies; No Waiver......................................................................... 25

                                    ARTICLE X
                                THE WARRANT AGENT

      Section 10.1.  Duties and Liabilities..................................................................... 26
      Section 10.2.  Right to Consult Counsel................................................................... 27
      Section 10.3.  Compensation; Indemnification.............................................................. 27
      Section 10.4.  No Restrictions on Actions................................................................. 27
      Section 10.5.  Discharge or Removal; Replacement Warrant Agent............................................ 28
      Section 10.6.  Successor Warrant Agent.................................................................... 29
 
                                   ARTICLE XI
                                  REGISTRATION

      Section 11.1.  Effectiveness and Availability of Registration Statement................................... 29
      Section 11.2.  Suspension................................................................................. 29
      Section 11.3.  Blue Sky................................................................................... 29
      Section 11.4.  Accuracy of Disclosure..................................................................... 30
      Section 11.5.  Indemnity.................................................................................. 30
      Section 11.6.  Expenses................................................................................... 30
      Section 11.7.  Additional Acts............................................................................ 30
 
                                   ARTICLE XII
                                  MISCELLANEOUS

      Section 12.1.  Money Deposited with the Warrant Agent..................................................... 31
      Section 12.2.  Payment of Taxes........................................................................... 31
      Section 12.3.  No Merger, Consolidation or Sale of Assets of Newco........................................ 31
 

<PAGE>


                                       iii

                                                                                                               Page


      Section 12.4.  Reports to Holders......................................................................... 31
      Section 12.5.  Notices.................................................................................... 32
      Section 12.6.  Governing Law.............................................................................. 32
      Section 12.7.  Binding Effect............................................................................. 33
      Section 12.8.  Counterparts............................................................................... 33
      Section 12.9.  Amendments................................................................................. 33
      Section 12.10.  Headings.................................................................................. 33
      Section 12.11.  Common Shares Legend...................................................................... 33
      Section 12.12.  Third Party Beneficiaries................................................................. 34
      Section 12.13.  Submission to Jurisdiction; Appointment of Agent for Service.............................. 34


EXHIBIT A             FORM OF WARRANT CERTIFICATE.................................A-1

APPENDIX A            LIST OF FINANCIAL EXPERTS

</TABLE>



<PAGE>
                                       2

                                WARRANT AGREEMENT

                      WARRANT AGREEMENT, dated as of [_____________], 1997 (this
"Agreement"),  between  ORION  NEWCO  SERVICES,  INC.,  a  Delaware  corporation
("Newco"),  and BANKERS TRUST COMPANY, a banking  corporation duly organized and
existing under the laws of the State of New York, as warrant agent (the "Warrant
Agent").

                      Pursuant to the terms of an  Underwriting  Agreement dated
as of [______________],  1997 (the "Underwriting Agreement"),  between Newco and
Orion Network Systems, Inc., a Delaware corporation ("Orion"),  on the one hand,
and Morgan  Stanley & Co.  Incorporated  ("Morgan  Stanley") and Merrill Lynch &
Co., as  Underwriters  (collectively,  the  "Underwriters"),  on the other hand,
Newco has agreed to issue and sell to the  Underwriters  _____ Senior Note Units
(collectively,  the "Senior Note Units") and _____  Senior  Discount  Note Units
(collectively,  the "Senior Discount Note Units";  and, together with the Senior
Note Units,  the  "Units").  Each Senior Note Unit will consist of (i) one ____%
Senior  Note due 2007  with a  principal  amount of  $1,000  (collectively,  the
"Senior  Notes")  to be  issued  pursuant  to the  provisions  of a Senior  Note
Indenture  (the "Senior Note  Indenture") to be dated as of the Closing Date (as
defined below) between Newco,  the  subsidiaries  of Orion,  as guarantors  (the
"Guarantors")  and  Bankers  Trust  Company,  as  trustee  and  (ii)  a  Warrant
(collectively,  the  "Warrants"),  each Warrant  entitling the holder thereof to
purchase  ______ Common Shares of Newco at a price of $[___] per share,  subject
to adjustment as provided herein. Each Senior Discount Note Unit will consist of
(i) one ___% Senior Unsecured  Discount Note due 2007 with a principal amount of
maturity of $1,000  (collectively,  the "Senior Discount Notes";  and,  together
with the Senior Notes, the "Notes") to be issued pursuant to the provisions of a
Senior  Discount Note  Indenture to be dated as of the Closing Date (the "Senior
Discount Note  Indenture";  and,  together with the Senior Note  Indenture,  the
"Indentures") between Newco, the Guarantors, as guarantors,  and the Trustee, as
trustee and (ii) a Warrant.  The Notes and  Warrants  included in each Unit will
become separately transferable at the close of business upon the earliest of (i)
the date  that is six  months  after  the  Closing  Date,  (ii) such date as the
Underwriters may, in their  discretion,  deem appropriate and (iii) in the event
of an Offer to Purchase,  the date Newco mails notice  thereof to holders of the
Notes.

                      In  consideration  of the foregoing and of the  agreements
contained  in the  Underwriting  Agreement  and for the purpose of defining  the
terms and provisions of the Warrants and the respective  rights and  obligations
thereunder  of Newco and the record  holders of the  Warrants  (the  "Holders"),
Newco and the Warrant Agent hereby agree as follows:


                                    ARTICLE I
                               CERTAIN DEFINITIONS

                      "Affiliate"  of any Person  means any Person  directly  or
indirectly  controlling  or  controlled  by or under  direct or indirect  common
control with such Person. For purposes of this definition,  "control", when used
with  respect  to any  Person,  means  the power to direct  the  management  and
policies of such Person, whether through the ownership of voting securities,

<PAGE>


by contract or otherwise,  and the terms  "controlling"  and  "controlled"  have
meanings correlative to the foregoing.

                      "Agent  Members" has the meaning  specified in Section 2.4
hereof.

                      "Business  Day" means any day which is not a  Saturday,  a
Sunday,  or any  other  day on which  banking  institutions  are  authorized  or
required  to be  closed  in the  State  of New York or the  state  in which  the
principal corporate trust office of the Warrant Agent is located.

                      "Certificated  Warrants"  has  the  meaning  specified  in
Section 2.4 hereof.

                      "Closing Date" means [____________], 1997.

                      "Commission" means the Securities and Exchange Commission.

                      "Common Shares" means the common stock, par value $.01 per
share,  of Newco and any other  capital  stock  into  which  such  shares may be
converted or  reclassified or that may be issued in respect of, in exchange for,
or in substitution  of, such Common Shares by reason of any stock splits,  stock
dividends, distributions, mergers, consolidations or other like events.

                      "Current  Market  Value"  has  the  meaning  specified  in
Section 4.1(f) hereof.

                      "Default" has the meaning specified in Article IX hereof.

                      "Depositary"  means  The  Depository  Trust  Company,  its
nominees and their respective successors.

                      "Exchange Act" means the Securities  Exchange Act of 1934,
as amended.

                      "Exercise Price" has the meaning  specified in Section 3.1
hereof.

                      "Expiration Date" means [________________], 2007.

                      "Expiration  Time" has the  meaning  specified  in Section
4.1(e) hereof.

                      "Financial  Expert"  means  one of the  Persons  listed in
Appendix A hereto.

                      "Global Warrant" has the meaning  specified in Section 2.1
hereof.

                      "Guarantors" has the meaning  specified in the recitals to
this Agreement.

                      "Holders"  has the meaning  specified  in the  recitals to
this Agreement.

<PAGE>

                      "Indentures" has the meaning  specified in the recitals to
this Agreement.

                      "Independent  Financial  Expert" means a Financial  Expert
that does not (and whose  directors,  executive  officers or 5%  stockholders do
not)  have a  direct  or  indirect  financial  interest  in  Newco or any of its
subsidiaries, which has not been for at least five years, and, at the time it is
called upon to give  independent  financial  advice to Newco is not (and none of
its directors,  executive officers or 5% stockholders is) a promoter,  director,
or officer of Newco or any of its subsidiaries. The Independent Financial Expert
may be compensated and indemnified by Newco for opinions or services it provides
as an Independent Financial Expert.

                      "Newco" has the meaning  specified in the recitals to this
Agreement.

                      "Notes" has the meaning  specified in the recitals to this
Agreement.

                      "Notice Date" has the meaning  specified in Section 3.4(b)
hereof.

                      "Offer Notice" has the meaning specified in Section 3.4(f)
hereof.

                      "Offer to  Purchase"  means an offer to purchase  Notes by
Newco from the Holders commenced by mailing a notice to the relevant trustee and
each Holder  stating:  (i) the covenant of the  Indenture  pursuant to which the
offer is being made and that all Notes  validly  tendered  will be accepted  for
payment on a pro rata basis;  (ii) the  purchase  price and the date of purchase
(which  shall be a Business  Day no earlier  than 30 days nor later than 60 days
from the date such notice is mailed) (the "Payment  Date");  (iii) that any Note
not tendered  will  continue to accrue  interest (or  original  issue  discount)
pursuant to its terms;  (iv) that,  unless Newco  defaults in the payment of the
purchase price,  any Note accepted for payment pursuant to the Offer to Purchase
shall cease to accrue  interest  (or original  issue  discount) on and after the
Payment Date; (v) that Holders electing to have a Note purchased pursuant to the
Offer to Purchase will be required to surrender the Note, together with the form
entitled  "Option of the Holder to Elect  Purchase"  on the reverse  side of the
Note  completed,  to the  Paying  Agent (as  defined in the  Indentures)  at the
address  specified  in the notice prior to the close of business on the Business
Day  immediately  preceding the Payment Date; (vi) that Holders will be entitled
to withdraw  their  election if the Paying  Agent  receives,  not later than the
close of business on the third  Business Day  immediately  preceding the Payment
Date, a telegram,  facsimile  transmission  or letter  setting forth the name of
such Holder,  the principal  amount at maturity of Notes  delivered for purchase
and a statement that such Holder is withdrawing  his election to have such Notes
purchased;  and (vii) that Holders whose Notes are being  purchased only in part
will  be  issued  new  Notes  equal  in  principal  amount  at  maturity  to the
unpurchased portion of the Notes surrendered;  provided that each Note purchased
and each new Note issued shall be in a principal amount at maturity of $1,000 or
an integral multiple thereof.

                      "Orion" has the meaning  specified in the recitals to this
Agreement.

<PAGE>

                      "Person" means any individual,  corporation,  partnership,
limited liability  company,  joint venture,  association,  joint-stock  company,
trust,  unincorporated  organization  or  government  or any agency or political
subdivision thereof.

                      "Registration  Statement"  has the  meaning  specified  in
Section 11.1 hereof.

                      "Relevant  Value"  has the  meaning  specified  in Section
3.4(d) hereof.

                      "Repurchase Event" means, and shall be deemed to occur on,
any date prior to the Expiration Date when Newco (i) consolidates or merges into
or with  another  Person  (but only where the holders of Common  Shares  receive
consideration  in exchange for all or part of such Common  Shares) if the Common
Shares (or other securities)  thereafter  issuable upon exercise of the Warrants
are not registered under the Exchange Act or (ii) sells all or substantially all
of its assets to  another  Person if the  Common  Shares  (or other  securities)
thereafter  issuable upon exercise of the Warrants is not  registered  under the
Exchange Act; provided that in each case a "Repurchase Event" will not be deemed
to have occurred if the  consideration for the Common Shares in such transaction
consists solely of cash.

                      "Repurchase  Notice" has the meaning  specified in Section
3.4(a) hereof.

                      "Repurchase  Obligation"  has  the  meaning  specified  in
Section 9.2 hereof.

                      "Repurchase  Offer" has the meaning  specified  in Section
3.4(b) hereof.

                      "Repurchase  Price" has the meaning  specified  in Section
3.4(d) hereof.

                      "Securities  Act"  means the  Securities  Act of 1933,  as
amended.

                      "Senior Discount Note Indenture" has the meaning specified
in the recitals to this Agreement.

                      "Senior  Discount Notes" has the meaning  specified in the
recitals to this Agreement.

                      "Senior Discount Notes Units" has the meaning specified in
the recitals to this Agreement.

                      "Senior Note  Indenture" has the meaning  specified in the
recitals to this Agreement.

                      "Senior  Notes" has the meaning  specified in the recitals
to this Agreement.

<PAGE>

                      "Senior  Note  Units"  has the  meaning  specified  in the
recitals to this Agreement.

                      "Separation  Date"  means the close of  business  upon the
earliest of (i) the date that is six months  after the Closing  Date,  (ii) such
date as the Underwriters may, in their discretion, deem appropriate and (iii) in
the event of an Offer to  Purchase,  the date  Newco  mails  notice  thereof  to
holders of the Notes.

                      "Spread" means,  with respect to any Warrant,  the Current
Market  Value  of the  Underlying  Securities  issuable  upon  exercise  of such
Warrant,  less the Exercise  Price of such Warrant,  in each case as adjusted as
provided herein.

                      "Underlying  Securities"  means the Common Shares or other
securities or property issuable upon exercise of the Warrants.

                      "Underwriting  Agreement" has the meaning specified in the
recitals to this Agreement.

                      "Units" has the meaning  specified in the recitals to this
Agreement.

                      "Valuation  Date" means the date five  Business Days prior
to the Notice Date.

                      "Value  Certificate" has the meaning  specified in Section
3.4(d)(ii)(1) hereof.

                      "Value  Report"  means the  value  report  prepared  by an
Independent Financial Expert in accordance with Section 3.4(d)(ii)(2) hereof.

                      "Warrant"  has the meaning  specified  in the  recitals to
this Agreement.

                      "Warrant Agent" has the meaning  specified in the preamble
to this Agreement.

                      "Warrant   Certificates"  has  the  meaning  specified  in
Section 2.1 hereof.


                                   ARTICLE II
                           ORIGINAL ISSUE OF WARRANTS

                  Section  2.1.  Form  of  Warrant  Certificates.   Certificates
representing  the  Warrants  (the  "Warrant  Certificates")  shall be  issued in
registered  form only,  shall be  substantially  in the form attached  hereto as
Exhibit A, shall be dated the date on which  countersigned  by the Warrant Agent
and shall have such  insertions as are  appropriate  or required or permitted by
this   Agreement  and  may  have  such  letters,   numbers  or  other  marks  of
identification and such legends and endorsements stamped, printed,  lithographed
or engraved thereon as Newco may deem

<PAGE>


appropriate and as are not  inconsistent  with the provisions of this Agreement,
or as may be  required  to  comply  with any law or with any rule or  regulation
pursuant  thereto or with any rule or regulation of any  securities  exchange on
which the Warrants may be listed, or to conform to usage.

                      The Warrants shall be issued  initially in the form of one
or more permanent  global Warrant  Certificates in definitive,  fully registered
form,  substantially in the form set forth in Exhibit A (the "Global  Warrant"),
deposited with the Warrant Agent, as custodian for the Depositary, duly executed
by Newco and countersigned by the Warrant Agent as hereinafter provided.

                      The  definitive  Warrant   Certificates  shall  be  typed,
printed,  lithographed  or  engraved or  produced  by any  combination  of these
methods or may be produced  in any other  manner  permitted  by the rules of any
securities  exchange on which the Warrants may be listed,  all as  determined by
the  officers  executing  such  Warrant  Certificates,  as  evidenced  by  their
execution of such Warrant Certificates.

                      Section 2.2.  Legends.  (a) Each Global Warrant shall also
bear the following legend on the face thereof:

      UNLESS  THIS  WARRANT   CERTIFICATE   IS   PRESENTED   BY  AN   AUTHORIZED
      REPRESENTATIVE  OF THE  DEPOSITORY  TRUST  COMPANY TO NEWCO OR THE WARRANT
      AGENT  FOR  REGISTRATION  OF  TRANSFER,  EXCHANGE  OR  REPURCHASE  AND ANY
      CERTIFICATE  ISSUED IS  REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER
      ENTITY AS IS REQUESTED BY AN AUTHORIZED  REPRESENTATIVE  OF THE DEPOSITORY
      TRUST  COMPANY  (AND ANY  PAYMENT  HEREON IS MADE TO CEDE & CO. OR TO SUCH
      OTHER  ENTITY  AS IS  REQUESTED  BY AN  AUTHORIZED  REPRESENTATIVE  OF THE
      DEPOSITORY  TRUST COMPANY),  ANY TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR
      VALUE OR  OTHERWISE BY OR TO ANY PERSON IS WRONGFUL  SINCE THE  REGISTERED
      OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

      TRANSFERS OF THIS GLOBAL  SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE,
      BUT NOT IN PART,  TO  NOMINEES  OF THE  DEPOSITORY  TRUST  COMPANY OR TO A
      SUCCESSOR THEREOF OR SUCH SUCCESSOR'S NOMINEE AND TRANSFERS OF PORTIONS OF
      THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH
      THE RESTRICTIONS SET FORTH IN ARTICLE II OF THE WARRANT AGREEMENT.

<PAGE>


                      (b)  Each   Warrant   Certificate   issued  prior  to  the
Separation Date shall bear the following legend on the face thereof:

      THE WARRANTS  EVIDENCED BY THIS  CERTIFICATE WERE INITIALLY ISSUED AS PART
      OF AN  ISSUANCE  OF SENIOR  NOTE  UNITS  (CUSIP NO.  [______])  AND SENIOR
      DISCOUNT NOTE UNITS (CUSIP NO. [_______]),  EACH SENIOR NOTE UNIT OF WHICH
      CONSISTS OF $[_______]  PRINCIPAL AMOUNT OF [__]% SENIOR NOTES DUE 2007 OF
      NEWCO (THE "SENIOR  NOTES") AND A WARRANT,  AND EACH SENIOR  DISCOUNT NOTE
      UNIT OF WHICH CONSISTS OF $[_____]  PRINCIPAL AMOUNT AT MATURITY OF SENIOR
      DISCOUNT NOTES DUE 2007 (TOGETHER WITH THE SENIOR NOTES,  THE "NOTES") AND
      A WARRANT.  PRIOR TO THE CLOSE OF  BUSINESS  UPON THE  EARLIEST OF (I) THE
      DATE THAT IS SIX MONTHS AFTER THE CLOSING DATE, (II) SUCH DATE AS THE
      UNDERWRITERS MAY, IN THEIR DISCRETION, DEEM APPROPRIATE AND (III) THE DATE
      NEWCO MAILS NOTICE OF AN OFFER TO  REPURCHASE  THE NOTES TO HOLDERS OF THE
      NOTES  PURSUANT  TO  THE  INDENTURES,   THE  WARRANTS  EVIDENCED  BY  THIS
      CERTIFICATE MAY NOT BE TRANSFERRED OR EXCHANGED  SEPARATELY  FROM, BUT MAY
      BE TRANSFERRED OR EXCHANGED ONLY TOGETHER WITH, THE NOTES.

                      Section   2.3.   Execution   and   Delivery   of   Warrant
Certificates.  Warrant Certificates evidencing Warrants to purchase initially an
aggregate of up to [__________]  Common Shares may be executed,  on or after the
date of this  Agreement,  by  Newco  and  delivered  to the  Warrant  Agent  for
countersignature,  and the Warrant Agent shall thereupon countersign and deliver
such Warrant  Certificates  upon the written order and at the direction of Newco
to the purchasers  thereof on the date of issuance.  The Warrant Agent is hereby
authorized to countersign and deliver  Warrant  Certificates as required by this
Section 2.3 or by Section 2.4, Section 3.3, Section 3.4 or Article VI hereof.

                      The  Warrant  Certificates  shall be executed on behalf of
Newco by its Chairman of the Board, Chief Executive Officer or President or by a
Vice President,  either manually or by facsimile signature printed thereon.  The
Warrant  Certificates shall be countersigned by manual or facsimile signature of
the  Warrant   Agent  and  shall  not  be  valid  for  any  purpose   unless  so
countersigned.  In case any  officer of Newco  whose  signature  shall have been
placed upon any of the Warrant  Certificates  shall cease to be such  officer of
Newco before countersignature by the Warrant Agent and the issuance and delivery
thereof,  such Warrant Certificates may,  nevertheless,  be countersigned by the
Warrant Agent and issued and delivered  with the same force and effect as though
such person had not ceased to be such officer of Newco.

                      Section 2.4.  Transfer and Exchange.  Newco shall cause to
be kept at the office of the Warrant Agent a register in which,  subject to such
reasonable  regulations  as it  may  

<PAGE>

prescribe,  Newco shall provide for the registration of Warrant Certificates and
transfers and exchanges of Warrant Certificates as herein provided.

                      A  Holder  may  transfer  its  Warrants  only  by  written
application to the Warrant Agent stating the name of the proposed transferee and
otherwise complying with the terms of this Agreement.  No such transfer shall be
effected until, and such transferee shall succeed to the rights of a Holder only
upon,  final acceptance and registration of the transfer by the Warrant Agent in
the register in accordance with this Agreement. Prior to the registration of any
transfer of Warrants by a Holder as provided  herein,  Newco,  the Warrant Agent
and any  agent of Newco may treat the  person  in whose  name the  Warrants  are
registered as the owner  thereof for all purposes and as the person  entitled to
exercise   the  rights   represented   thereby,   any  notice  to  the  contrary
notwithstanding.   Furthermore,  any  holder  of  a  Global  Warrant  shall,  by
acceptance of such Global Warrant,  agree that transfers of beneficial interests
in such  Global  Warrant  may be  effected  only  through  a  book-entry  system
maintained by the Holder of such Global Warrant (or
its  agent),  and  that  ownership  of a  beneficial  interest  in the  Warrants
represented  thereby  shall be required to be  reflected  in a book entry.  When
Warrants  are  presented  to the Warrant  Agent with a request to  register  the
transfer  thereof or to exchange  them for an equal  number of Warrants of other
authorized denominations,  the Warrant Agent shall register the transfer or make
the  exchange  as  requested  if the  requirements  of this  Agreement  for such
transaction are met. To permit  registrations of transfers and exchanges,  Newco
shall execute Warrant  Certificates at the Warrant Agent's  request.  No service
charge shall be made for any  registration  of transfer or exchange of Warrants,
but Newco may require  payment of a sum  sufficient to cover any transfer tax or
similar  governmental  charge  payable in connection  with any  registration  of
transfer or exchange of Warrants.

                      The  Warrants  will  initially  be  issued  as part of the
issuance of the Units.  Prior to the  Separation  Date,  the Warrants may not be
transferred  or exchanged  separately  from, but may be transferred or exchanged
only together with, the Notes issued as part of such Units.

                      Notwithstanding  any other provisions of this Section 2.4,
unless and until it is exchanged in whole or in part for Warrants in  definitive
registered form ("Certificated  Warrants"), a Global Warrant representing all or
a  portion  of the  Warrants  may not be  transferred  except  as a whole by the
Depositary to a nominee of such Depositary or by a nominee of such Depositary to
such  Depositary or another  nominee of such Depositary or by such Depositary or
any such  nominee  to a  successor  Depositary  or a nominee  of such  successor
Depositary.  Interests  of  beneficial  owners  in  the  Global  Warrant  may be
transferred  in  accordance  with the rules and  procedures  of the  Depositary.
Members of, or participants in, the Depositary  ("Agent  Members") shall have no
rights under this  Agreement  with  respect to the Global  Warrant held on their
behalf  by the  Depositary  or the  Warrant  Agent  as its  custodian,  and  the
Depositary may be treated by Newco,  the Warrant Agent and any agent of Newco or
the Warrant Agent as the absolute  owner of such Global Warrant for all purposes
whatsoever.  Notwithstanding the foregoing,  nothing herein shall prevent Newco,
the Warrant  Agent or any 

<PAGE>

agent  of  Newco  or the  Warrant  Agent  from  giving  effect  to  any  written
certification,  proxy or other  authorization  furnished  by the  Depositary  or
impair,  as between the  Depositary  and its Agent  Members,  the  operation  of
customary  practices  governing  the  exercise  of the rights of a Holder of any
Warrants.  The  registered  holder of the Global  Warrant may grant  proxies and
otherwise  authorize  any person,  including  Agent Members and persons that may
hold  interests  through  Agent  Members,  to take any action  which a Holder is
entitled to take under this Agreement or the Warrants.

                      If the  Depositary  notifies Newco that it is unwilling or
unable to continue as Depositary for the Global Warrant or Warrants or if at any
time the Depositary  shall no longer be eligible under the next sentence of this
paragraph,  Newco  shall  appoint a  successor  Depositary  with  respect to the
Warrants.  Each Depositary  appointed  pursuant to this Section 2.4 must, at the
time of its  appointment  and at all times while it serves as  Depositary,  be a
clearing  agency  registered  under the  Exchange  Act and any other  applicable
statute or regulation.  Newco will execute,  and the Warrant Agent, upon receipt
of written  instructions from Newco,  will countersign and deliver,  Warrants in
definitive  registered  form in any  authorized  denominations,  in an aggregate
amount equal to the amount of the Global Warrant or Warrants  representing  such
Warrants in  exchange  for such  Global  Warrant or  Warrants if the  Depositary
notifies  Newco that it is unwilling or unable to continue as Depositary for the
Global Warrant or Warrants or if at any time the  Depositary  shall no longer be
eligible to serve as Depositary  and a successor  Depositary for the Warrants is
not  appointed  by Newco  within 60 days after  Newco  receives  such  notice or
becomes aware of such ineligibility.

                      Newco may at any time and in its sole discretion determine
that the  Warrants  shall no  longer  be  represented  by a  Global  Warrant  or
Warrants.  In such event Newco will execute, and the Warrant Agent, upon receipt
of written  instructions from Newco, will countersign and deliver,  Certificated
Warrants in any authorized  denominations,  in an aggregate  amount equal to the
amount of Warrants represented by the Global Warrant or Warrants in exchange for
such Global Warrant or Warrants.

                      Upon the  exchange of a Global  Warrant  for  Certificated
Warrants,  such  Global  Warrant  shall  be  cancelled  by  the  Warrant  Agent.
Certificated  Warrants issued in exchange for a Global Warrant  pursuant to this
Section  2.4  shall  be  registered  in  such  names  and  in  such   authorized
denominations   as  the  Depositary  for  such  Global   Warrant,   pursuant  to
instructions  from its  direct or  indirect  participants  or  otherwise,  shall
instruct the Warrant  Agent.  The Warrant Agent shall deliver such  Certificated
Warrants to or as directed  by the Persons in whose names such  Warrants  are so
registered.

                      All Warrant  Certificates  issued upon any registration of
transfer  or  exchange  of  Warrants  shall be the valid  obligations  of Newco,
evidencing  the same  obligations,  and entitled to the same benefits under this
Agreement, as the Warrant Certificates  surrendered for registration of transfer
or exchange.

<PAGE>


                      Section  2.5.  Surrender  of  Warrant  Certificates.   Any
Warrant Certificate surrendered for registration of transfer, exchange, exercise
or repurchase of the Warrants  represented  thereby  shall,  if  surrendered  to
Newco,  be  delivered  to  the  Warrant  Agent,  and  all  Warrant  Certificates
surrendered or so delivered to the Warrant Agent shall be promptly  cancelled by
the Warrant Agent and shall not be reissued by Newco and,  except as provided in
this  Article  II in case of an  exchange,  Article  III  hereof  in case of the
exercise or  repurchase  of less than all the  Warrants  represented  thereby or
Article VI in case of a mutilated Warrant  Certificate,  no Warrant  Certificate
shall be issued  hereunder in lieu thereof.  The Warrant Agent shall destroy all
cancelled Warrant Certificates in accordance with its normal procedures.


                                   ARTICLE III
               EXERCISE PRICE; EXERCISE AND REPURCHASE OF WARRANTS

                      Section 3.1.  Exercise  Price.  Each  Warrant  Certificate
shall,  when  countersigned  by the Warrant Agent,  entitle the Holder  thereof,
subject to the provisions of this Agreement,  to purchase  [___________]  Common
Shares for each Warrant  represented  thereby at a purchase price (the "Exercise
Price") of $[_____] per share,  subject to adjustment as provided in Section 4.1
and  Article V hereof,  provided  that,  at the  option of the  Holder  thereof,
payment  of the  Exercise  Price  may be  satisfied  through  the  delivery  and
cancellation  of  additional  Warrants  having an aggregate  Spread equal to the
Exercise Price of the Warrants being exercised.

                      Section 3.2.  Exercise;  Restrictions on Exercise.  (a) At
any time after six months from the Closing Date and on or before the  Expiration
Date, any  outstanding  Warrants may be exercised on any Business Day;  provided
that the  Registration  Statement  is, at the time of  exercise,  effective  and
available  or the  exercise of such  Warrants  is exempt  from the  registration
requirements of the Securities Act. Any Warrants not exercised by 5:00 p.m., New
York City  time,  on the  Expiration  Date  shall  expire  and all rights of the
Holders of such  Warrants  shall  terminate.  Additionally,  pursuant to Section
4.1(i)(ii) hereof, the Warrants may expire and all rights of the Holders of such
Warrants  shall  terminate in the event Newco merges or  consolidates  with,  or
sells all or  substantially  all of its property and assets to, a Person  (other
than an  Affiliate of Newco) if the  consideration  payable to holders of Common
Shares in exchange  for their  Common  Shares in  connection  with such  merger,
consolidation  or  sale  consists  solely  of  cash  or  in  the  event  of  the
dissolution, liquidation or winding up of Newco.

                      (b) In the event a Holder exercises its Warrants at a time
when the Registration Statement is not effective and available, such Holder must
furnish to the Warrant Agent and Newco such  certifications,  legal  opinions or
other information as either of them may reasonably  require to confirm that such
exercise  is  being  made  pursuant  to  an  exemption  from  the   registration
requirements of the Securities Act.

<PAGE>

                      Section  3.3.  Method of  Exercise;  Payment  of  Exercise
Price. In order to exercise all or any of the Warrants  represented by a Warrant
Certificate,  the  Holder  thereof  must  surrender  for  exercise  the  Warrant
Certificate  to the Warrant  Agent at its  corporate  trust  office set forth in
Section  12.5  hereof,  with  the  Subscription  Form set  forth in the  Warrant
Certificate  duly executed,  together with payment in full of the Exercise Price
then in effect for each Common Share or other  securities  or property  issuable
upon exercise of the Warrants as to which a Warrant is  exercised;  such payment
may be made (x) in the  form of cash or by  certified  or  official  bank  check
payable to the order of Newco or (y) as  permitted  pursuant  to the  proviso in
Section 3.1. All payments  received upon exercise of Warrants shall be delivered
to Newco by the Warrant Agent as  instructed  in writing by Newco.  If less than
all the  Warrants  represented  by a Warrant  Certificate  are  exercised,  such
Warrant  Certificate  shall be surrendered and a new Warrant  Certificate of the
same tenor and for the number of  Warrants  which  were not  exercised  shall be
executed by Newco and delivered to the Warrant Agent and the Warrant Agent shall
countersign the new Warrant Certificate, registered in such name or names as may
be  directed  in  writing  by the  Holder,  and shall  deliver  the new  Warrant
Certificate to the Person or Persons
entitled to receive the same. Upon exercise of any Warrants following  surrender
of a Warrant  Certificate  in  conformity  with the  foregoing  provisions,  the
Warrant Agent shall instruct  Newco to transfer  promptly to or upon the written
order  of the  Holder  of  such  Warrant  Certificate  appropriate  evidence  of
ownership of any Common Shares or other securities or property (including money)
to which it is entitled, registered or otherwise placed in such name or names as
may be  directed  in writing by the  Holder,  and to deliver  such  evidence  of
ownership and any other securities or property  (including  money) to the Person
or Persons entitled to receive the same, together with an amount in cash in lieu
of any  fractional  shares as provided in Section 4.5 hereof;  provided that the
Holder of such  Warrant  shall be  responsible  for the payment of any  transfer
taxes  required as the result of any change in ownership of such Warrants or the
issuance of such Common Shares or other securities or property other than to the
registered owner of such Warrants.  Upon exercise of a Warrant or Warrants,  the
Warrant Agent is hereby authorized and directed to requisition from any transfer
agent of the Common Shares (and all such transfer agents are hereby  irrevocably
authorized to comply with all such  requests)  certificates  (bearing the legend
set forth in Section 12.11, if applicable) for the necessary number of shares to
which the Holder of the Warrant or Warrants may be entitled.  A Warrant shall be
deemed to have been exercised  immediately prior to the close of business on the
date  of  the  surrender  for  exercise,  as  provided  above,  of  the  Warrant
Certificate  representing  such Warrant and, for all purposes of this Agreement,
the Person entitled to receive any Common Shares or other securities or property
deliverable  upon such  exercise  shall,  as between  such Person and Newco,  be
deemed to be the Holder of such Common Shares or other securities or property of
record  as of the  close of  business  on such  date and  shall be  entitled  to
receive,  and the Warrant Agent shall deliver to such Person, any money,  Common
Shares or other  securities or property to which he would have been entitled had
he been the record holder on such date.  Without limiting the foregoing,  if, at
the date  referred to above,  the transfer  books for the Common Shares or other
securities  purchasable  upon the exercise of the Warrants shall be closed,  the
certificates  for the  Common  Shares or  securities  in  respect  of which such

<PAGE>


Warrants are then exercised shall be issuable as of the date on which such books
shall  next be  opened,  and  until  such date  Newco  shall be under no duty to
deliver any  certificate  for such Common Shares or other  securities;  provided
further that the transfer books or records, unless required by law, shall not be
closed at any one time for a period longer than 20 days.

                      Section 3.4.  Repurchase  Offers. (a) Notice of Repurchase
Event. Within five Business Days following the occurrence of a Repurchase Event,
Newco shall give notice (a  "Repurchase  Notice") to all Holders of the Warrants
and the Warrant Agent that such event has occurred.

                      (b) Repurchase Offers Generally.  Following the occurrence
of a Repurchase Event,  Newco shall offer to repurchase for cash all outstanding
Warrants pursuant to the provisions of this Section 3.4 (a "Repurchase  Offer").
Newco shall give notice of a Repurchase  Offer in accordance with Section 3.4(f)
hereof.  The  date on which  Newco  gives  any such  notice  with  respect  to a
Repurchase Offer is referred to as the "Notice Date". The Repurchase Offer shall
commence on the Notice Date for such  Repurchase  Offer and shall expire at 5:00
p.m., New York City time, on a date determined by Newco (the "expiration  date")
that is at least 30 but not more than 60  calendar  days after the Notice  Date.
Once a  Repurchase  Event  has  occurred,  there is no limit  on the  number  of
Repurchase Offers that Newco may make.

                      (c) Repurchase  Offers. (i) In any Repurchase Offer, Newco
shall offer to purchase for cash at the Repurchase  Price (as defined below) all
Warrants  outstanding  on the  Notice  Date for such  Repurchase  Offer that are
properly  tendered to the Warrant Agent on or prior to the  expiration  date for
such Repurchase Offer.

                      (ii) Each  Holder  may,  but shall  not be  obligated  to,
accept such  Repurchase  Offer by tendering to the Warrant Agent, on or prior to
the  expiration  date  for  such  Repurchase  Offer,  the  Warrant  Certificates
evidencing the Warrants such Holder  desires to have  repurchased in such offer,
together with a completed  Certificate for Surrender in  substantially  the form
attached to the Warrant  Certificate.  A Holder may withdraw all or a portion of
the Warrants  tendered to the Warrant Agent at any time prior to the  expiration
date for such Repurchase  Offer. If less than all the Warrants  represented by a
Warrant  Certificate  shall  be  tendered,  such  Warrant  Certificate  shall be
surrendered  and a new Warrant  Certificate of the same tenor and for the number
of Warrants  which were not tendered shall be executed by Newco and delivered to
the  Warrant  Agent and the  Warrant  Agent  shall  countersign  the new Warrant
Certificate,  registered  in such name or names as may be directed in writing by
the  Holder,  and shall  deliver the new  Warrant  Certificate  to the Person or
Persons entitled to receive the same;  provided that the Holder of such Warrants
shall be  responsible  for the  payment of any  transfer  taxes  required as the
result of any change in ownership of such Warrants.

                      (d)  Repurchase   Price.   (i)  The  purchase  price  (the
"Repurchase  Price") for each  Warrant  properly  tendered to the Warrant  Agent
pursuant  to a  Repurchase  Offer  shall be 

<PAGE>

equal to the value (the  "Relevant  Value") on the Valuation  Date of the Common
Shares  issuable,  and  other  securities  or  property  which  would  have been
delivered, upon exercise of Warrants had the Warrants been exercised (regardless
of whether the Warrants are then  exercisable),  less the Exercise Price then in
effect.

                      (ii) The  Relevant  Value of the  Common  Shares and other
securities or property issuable upon exercise of the Warrants,  on any Valuation
Date, shall be:

                      (1) (A) If the  Common  Shares (or other  securities)  are
      registered  under the Exchange Act,  deemed to be the average of the daily
      market prices (on the stock  exchange that is the primary  trading  market
      for the Common Shares) of the Common Shares (or other  securities) for the
      20 consecutive  trading days immediately  preceding such Valuation Date or
      (B) if the Common Shares (or other  securities) have been registered under
      the  Exchange  Act for less than 20  consecutive  trading days before such
      date,  then the average of the daily market  prices for all of the trading
      days before such date for which daily market prices are available,  in the
      case of each of (A) and (B),  as  certified  to the  Warrant  Agent by the
      President, any Vice President or the Chief Financial Officer of Newco (the
      "Value Certificate"). The Warrant Agent shall have no duty with respect to
      the  Value  Certificate,  except  to  keep it on file  and  available  for
      inspection  by the  Holders  and the  Warrant  Agent shall have no duty or
      responsibility   in  determining   the  accuracy  or  correctness  of  the
      calculations in such  certificate.  The market price for each such trading
      day shall be: (A) in the case of a security  listed or admitted to trading
      on any national securities exchange, the closing sales price, regular way,
      on such day,  or if no sale takes  place on such day,  the  average of the
      closing  bid and asked  prices on such day,  (B) in the case of a security
      not  then  listed  or  admitted  to  trading  on any  national  securities
      exchange,  the last  reported  sale price on such day, or if no sale takes
      place on such day, the average of the closing bid and asked prices on such
      day, as reported by a reputable  quotation source designated by Newco, (C)
      in the case of a security  not then  listed or  admitted to trading on any
      national  securities  exchange and as to which no such reported sale price
      or bid and asked prices are  available,  the average of the reported  high
      bid and low asked prices on such day, as reported by a reputable quotation
      service,  or  a  newspaper  of  general  circulation  in  the  Borough  of
      Manhattan,  City  and  State  of New York  customarily  published  on each
      Business Day,  designated by Newco, or, if there shall be no bid and asked
      prices on such day, the average of the high bid and low asked  prices,  as
      so  reported,  on the most  recent day (not more than 30 days prior to the
      date in question)  for which prices have been so reported and (D) if there
      are not bid and asked prices reported during the 30 days prior to the date
      in  question,  the  Relevant  Value shall be  determined  as if the Common
      Shares (or other  securities)  were not registered under the Exchange Act;
      or

                      (2) If the  Common  Shares (or other  securities)  are not
      registered under the Exchange Act or if the value cannot be computed under
      clause (1)  above,  deemed to be 

<PAGE>

      equal to the value set forth in the Value  Report  (as  defined  below) as
      determined by an Independent  Financial Expert, which shall be selected by
      the Board of Directors of Newco in accordance  with Section 3.4(e) hereof,
      and  retained  on  customary  terms  and  conditions,  using  one or  more
      valuation  methods  that the  Independent  Financial  Expert,  in its best
      professional  judgment,  determines  to be most  appropriate  but  without
      giving effect to any discount for lack of  liquidity,  the fact that Newco
      has no class of equity securities registered under the Exchange Act or the
      fact that the Common Shares and other securities or property issuable upon
      exercise of the  Warrants  represent a minority  interest in Newco.  Newco
      shall cause the Independent  Financial Expert to deliver to Newco,  with a
      copy to the  Warrant  Agent,  within  45 days  of the  appointment  of the
      Independent  Financial  Expert in accordance with Section 3.4(e) hereof, a
      value report (a "Value  Report")  stating the Relevant Value of the Common
      Shares and other  securities or property,  if any,  being valued as of the
      Valuation Date and containing a brief statement as to the nature and scope
      of the  examination  or  investigation  upon  which the  determination  of
      Relevant Value was made. The Warrant Agent shall have no duty with respect
      to the Value Report of any Independent Financial Expert, except to keep it
      on file and available for  inspection by the Holders and the Warrant Agent
      shall  have no duty or  responsibility  in  determining  the  accuracy  or
      correctness of the  calculations in such report.  The  determination as to
      Relevant  Value in accordance  with the  provisions of this Section 3.4(d)
      shall be conclusive on all Persons. The Independent Financial Expert shall
      consult with  management of Newco in order to allow  management to comment
      on the  proposed  Relevant  Value  prior to delivery to Newco of any Value
      Report of the Independent Financial Expert.

                      (e) Selection of Independent  Financial  Expert. If clause
(d)(ii)(2)  is  applicable,  the Board of  Directors  of Newco  shall  select an
Independent  Financial  Expert  not more than five  Business  Days  following  a
Repurchase  Event.  Within  two  calendar  days  after  such  selection  of  the
Independent  Financial Expert, Newco shall deliver to the Warrant Agent a notice
setting forth the name of such Independent Financial Expert.

                      (f)  Notice  of  Repurchase   Offer.   Each  notice  of  a
Repurchase  Offer (an "Offer  Notice") given by Newco pursuant to Section 3.4(b)
shall (i) be given by Newco directly to all Holders of the Warrants, with a copy
to the Warrant Agent;  (ii) be given  simultaneously  with the Repurchase Notice
(or,  in the  event  that the  Relevant  Value  of the  Common  Shares  or other
securities  or property  issuable  upon  exercise of all the Warrants  cannot be
determined  pursuant to Section  3.4(d)(ii)(1),  then such Offer Notice shall be
given  within five  Business  Days after Newco  receives  the Value  Report with
respect to such  offer);  and (iii)  specify  (A) the  expiration  date for such
Repurchase  Offer,  (B) the manner in which  Warrants may be  surrendered to the
Warrant Agent for  repurchase by Newco,  (C) the  Repurchase  Price at which the
Warrants  will be  repurchased  by  Newco,  (D) if  applicable,  the name of the
Independent  Financial  Expert  whose  valuation  of the Common  Shares or other
securities  or  property  was  utilized  in  connection  with  determining  such
Repurchase  Price and (E) that payment of the  Repurchase  Price will be 

<PAGE>

made  by  the  Warrant  Agent.  Each  such  notice  shall  be  accompanied  by a
Certificate  for  Surrender  for  Repurchase  Offer  in  substantially  the form
attached to the Warrant Certificate and a copy of the Value Report, if any.

                      (g) Payment for Warrants. Upon surrender for repurchase of
any Warrants in conformity  with the provisions of this Section 3.4, the Warrant
Agent shall  thereupon  promptly  notify Newco of such  surrender.  Before 10:00
A.M., New York City time, on the expiration date for any Repurchase Offer, Newco
shall  deposit with the Warrant  Agent funds  sufficient to make payment for the
Warrants tendered to the Warrant Agent and not withdrawn.  After receipt of such
deposit from Newco, the Warrant Agent shall make payment,  by delivering a check
in such  amount  as is  appropriate,  to such  Person  or  Persons  as it may be
directed  in  writing  by the  Holder  surrendering  such  Warrants,  net of any
transfer  taxes  required  to be paid in the event  payment  is made to a Person
other than the Holder.

                      (h)  Compliance   with  Laws.   Notwithstanding   anything
contained  in this  Section  3.4,  if Newco is  required  to comply with laws or
regulations in connection with making
any Repurchase  Offer,  such laws or regulations shall govern the making of such
Repurchase Offer.


                                   ARTICLE IV
                                   ADJUSTMENTS

                      Section  4.1.  Adjustments.  The  Exercise  Price  and the
number of Common Shares  issuable upon exercise of each Warrant shall be subject
to adjustment from time to time as follows:

                      (a) Stock Dividends;  Stock Splits;  Reverse Stock Splits;
Reclassifications.  In the event  Newco  shall (i)  declare or pay a dividend or
make any other  distribution  with respect to its Common Shares in shares of any
class or series of its capital  stock,  (ii)  subdivide its  outstanding  Common
Shares,  (iii) combine its  outstanding  Common Shares into a smaller  number of
shares, or (iv) issue any shares of its capital stock in a  reclassification  of
the Common Shares (other than a  reclassification  in connection  with a merger,
consolidation  or other business  combination  which will be governed by Section
4.1(j)),  the number of Common Shares  purchasable upon exercise of each Warrant
immediately  prior to the record date for such dividend or  distribution  or the
effective date of such subdivision,  or combination or reclassification shall be
adjusted  so that the Holder of each  Warrant  shall  thereafter  be entitled to
receive the kind and number of Common Shares or other  securities of Newco which
such Holder would have been  entitled to receive  after the  happening of any of
the events described above had such Warrant been exercised  immediately prior to
the  happening of such event or any record date with respect  thereto  (with any
record date requirement being deemed to have been satisfied). An adjustment made
pursuant to this Section  4.1(a) shall become  effective  

<PAGE>

immediately  after the effective  date of such event  retroactive  to the record
date, if any, for such event.

                      (b) Rights;  Options;  Warrants.  In the event Newco shall
issue rights, options, warrants or convertible or exchangeable securities (other
than a convertible or  exchangeable  security  subject to Section 4.1(a)) to all
holders of its Common Shares, entitling them to subscribe for or purchase Common
Shares at a price per share  (determined  in the case of such  rights,  options,
warrants or convertible or  exchangeable  securities,  by dividing (x) the total
amount  receivable  by Newco in  consideration  of the  issuance of such rights,
options,  warrants or convertible or exchangeable  securities,  if any, plus the
total  consideration  payable to Newco upon  exercise,  conversion  or  exchange
thereof,  by (y) the total  number  of Common  Shares  covered  by such  rights,
options,  warrants or convertible or exchangeable securities) which is lower (at
the record date for such issuance) than the then Current Market Value per Common
Share, the number of Common Shares  thereafter  purchasable upon the exercise of
each Warrant  shall be  determined  by  multiplying  the number of Common Shares
theretofore  purchasable  upon  exercise  of each  Warrant  by a  fraction,  the
numerator of which shall be the number of Common Shares outstanding  immediately
prior to the  issuance  of such  rights,  options,  warrants or  convertible  or
exchangeable  securities plus the number of additional Common Shares offered for
subscription  or purchase or  issuable  upon  conversion  or  exchange,  and the
denominator  of  which  shall  be  the  number  of  Common  Shares   outstanding
immediately  prior  to  the  issuance  of  such  rights,  options,  warrants  or
convertible  or  exchangeable  securities  plus the  number of shares  which the
aggregate  offering  price of the total number of Common Shares so offered would
purchase at the then Current  Market  Value per Common  Share.  Such  adjustment
shall  be made  whenever  such  rights,  options,  warrants  or  convertible  or
exchangeable  securities are issued,  and shall become  effective  retroactively
immediately after the record date for the determination of shareholders entitled
to receive  such  rights,  options,  warrants  or  convertible  or  exchangeable
securities.

                      (c)  Issuance  of Common  Shares at Lower  Values.  In the
event Newco shall sell and issue any Common Shares or Right  (excluding  (i) any
Right  issued in any of the  transactions  described  in  Section  4.1(a) or (b)
above,  (ii) any Common Shares issued pursuant to (x) any Rights  outstanding on
the date of this  Agreement  and (y) a  Right,  if on the date  such  Right  was
issued, the exercise, conversion or exchange price per Common Share with respect
thereto was at least equal to the then Current Market Value per Common Share and
(iii) any Right  issued as  consideration  when any  corporation  or business is
acquired,  merged into or becomes part of Newco or a  subsidiary  of Newco in an
arm's-length  transaction  between Newco and a Person other than an Affiliate of
Newco) at a price per Common  Share  (determined  in the case of such Right,  by
dividing (x) the total amount  receivable by Newco in  consideration of the sale
and issuance of such Right, plus the total  consideration  payable to Newco upon
exercise,  conversion  or exchange  thereof,  by (y) the total  number of Common
Shares  covered by such Right) that is lower than the Current  Market  Value per
Common  Share in effect  immediately  prior to such sale or  issuance,  then the
number of Common Shares thereafter purchasable upon 

<PAGE>

                      the  exercise  of each  Warrant  shall  be  determined  by
multiplying the number of Common Shares theretofore purchasable upon exercise of
such Warrant by a fraction, the numerator of which shall be the number of Common
Shares  outstanding  immediately after such sale or issuance and the denominator
of which shall be the number of Common Shares  outstanding  immediately prior to
such sale or  issuance  plus the  number of Common  Shares  which the  aggregate
consideration  received (determined as provided below) for such sale or issuance
would  purchase at such Current  Market Value per Common Share.  For purposes of
this Section 4.1(c),  the Common Shares which the holder of any such Right shall
be  entitled  to  subscribe  for or  purchase  shall be deemed to be issued  and
outstanding  as of the date of such  sale  and  issuance  and the  consideration
received by Newco therefor shall be deemed to be the  consideration  received by
Newco for such Right, plus the consideration or premiums stated in such Right to
be paid for the Common  Shares  covered  thereby.  In case Newco  shall sell and
issue Common Shares or any Right, for a consideration consisting, in whole or in
part, of property other than cash or its  equivalent,  then in  determining  the
"price per Common Share" and the "consideration  received by Newco" for purposes
of the first  sentence of this Section  4.1(c),  the Board of Directors of Newco
shall  determine,  in  good  faith,  the  fair  value  of said  property,  which
determination  shall be evidenced  by a resolution  of the Board of Directors of
Newco.  In case Newco shall sell and issue any Right  together  with one or more
other  securities as part of a unit at a price per unit, then in determining the
"price per Common Share" and the "consideration  received by Newco" for purposes
of the first  sentence of this Section  4.1(c),  the Board of Directors of Newco
shall  determine,  in good faith, the fair value of the Right then being sold as
part of such unit, which determination shall be evidenced by a resolution of the
Board of Directors of Newco.  For purposes of this  paragraph,  a "Right"  shall
mean  any  right,  option,  warrant  or  convertible  or  exchangeable  security
containing  the right to  subscribe  for or acquire one or more  Common  Shares,
excluding the Warrants.

                      (d) Distributions of Debt, Assets,  Subscription Rights or
Convertible  Securities.  In the event  Newco  shall  fix a record  date for the
making of a distribution to all holders of its Common Shares of evidences of its
indebtedness,  assets, cash dividends or distributions  (excluding  dividends or
distributions referred to in Section 4.1(a) above and excluding distributions in
connection with the  dissolution,  liquidation or winding up of Newco which will
be governed by Section 4.1(j)(ii) below) or securities (excluding those referred
to in Section 4.1(a), Section 4.1(b) or Section 4.1(c) above), then in each case
the number of Common Shares purchasable after such record date upon the exercise
of each Warrant shall be determined by  multiplying  the number of Common Shares
purchasable upon the exercise of such Warrant  immediately  prior to such record
date by a fraction, the numerator of which shall be the Current Market Value per
Common Share  immediately prior to the record date for such distribution and the
denominator  of  which  shall be the  Current  Market  Value  per  Common  Share
immediately  prior to the record date for such  distribution  less the then fair
value (as  determined  in good faith by the Board of  Directors of Newco) of the
portion of the assets, evidence of indebtedness, cash dividends or distributions
or securities so  distributed  applicable to one Common Share.  Such  adjustment
shall be made whenever any such distribution is made, and 

<PAGE>

shall become  effective on the date of  distribution  retroactive  to the record
date  for  the   determination   of   shareholders   entitled  to  receive  such
distribution.

                      (e) Self-Tenders. In case of the consummation of an issuer
bid or a tender or  exchange  offer  (other  than an odd-lot  tender  offer or a
normal  course  issuer bid) made by Newco or any  subsidiary of Newco for all or
any  portion of the Common  Shares to the extent  that the cash and value of any
other  consideration  included  in such  payment  per Common  Share  exceeds the
Current  Market  Price  per  share of  Common  Shares  on the  trading  day next
succeeding the Expiration Time (as defined  below),  the Exercise Price shall be
reduced so that the same shall equal the price  determined  by  multiplying  the
Exercise Price in effect immediately prior to the last time tenders or exchanges
were  made  pursuant  to such  issuer  bid or  tender  or  exchange  offer  (the
"Expiration  Time") by a fraction of which the numerator  shall be the number of
Common Shares  outstanding  (including any tendered or exchanged  shares) on the
Expiration  Time  multiplied by the Current Market Price of the Common Shares on
the trading day next succeeding the Expiration  Time, and the denominator  shall
be the sum of (A) the fair market value (determined by the Board of Directors of
Newco, whose  determination shall be conclusive and described in a resolution of
the Board of Directors) of the aggregate  consideration  payable to stockholders
based on the acceptance (up to any maximum  specified in the terms of the issuer
bid or tender or exchange offer) of all shares validly tendered or exchanged and
not withdrawn as the Expiration  Time (the shares deemed so accepted,  up to any
such maximum,  as of the Expiration  Time (the shares deemed so accepted,  up to
any such  maximum,  being  referred to as the  "Purchased  Shares")  and (B) the
product of the number of Common Shares  outstanding  (less any Purchased Shares)
on the Expiration  Time and the Current Market Price of the Common Shares on the
trading day next  succeeding  the  Expiration  Time,  such  reduction  to become
effective  immediately prior to the opening of business on the day following the
Expiration Time.

                      (f)   Expiration   of  Rights,   Options  and   Conversion
Privileges.  Upon the expiration of any rights, options,  warrants or conversion
or exchange privileges that have previously resulted in an adjustment hereunder,
if any thereof shall not have been exercised,  the Exercise Price and the number
of Common  Shares  issuable upon the exercise of each Warrant  shall,  upon such
expiration,  be readjusted and shall  thereafter,  upon any future exercise,  be
such as they  would  have been had they  been  originally  adjusted  (or had the
original  adjustment not been  required,  as the case may be) as if (i) the only
Common Shares so issued were the Common Shares,  if any, actually issued or sold
upon the exercise of such rights,  options,  warrants or  conversion or exchange
rights  and  (ii)  such  Common  Shares,  if any,  were  issued  or sold for the
consideration   actually   received  by  Newco  upon  such   exercise  plus  the
consideration, if any, actually received by Newco for issuance, sale or grant of
all such rights,  options,  warrants or conversion or exchange rights whether or
not  exercised;  provided  that no such  readjustment  shall  have the effect of
increasing the Exercise  Price by an amount,  or decreasing the number of shares
issuable upon  exercise of each Warrant by a number,  in excess of the 

<PAGE>

amount or number of the  adjustment  initially  made in respect to the issuance,
sale or grant of such  rights,  options,  warrants  or  conversion  or  exchange
rights.

                      (g)  Current  Market  Value.   For  the  purposes  of  any
computation  under this Article IV, the Current Market Value per Common Share or
of any other security (herein  collectively  referred to as a "security") at any
date herein specified shall be:

                           (i)  if the  security  is not  registered  under  the
      Exchange Act, the value of the security (1) most recently determined as of
      a date  within  the six  months  preceding  such  date  by an  Independent
      Financial  Expert  selected by Newco in  accordance  with the criteria for
      such valuation set out in Section 4.1(l), or (2) if no such  determination
      shall have been made within such six-month  period or if Newco so chooses,
      determined as of such date by an Independent  Financial Expert selected by
      Newco in  accordance  with the  criteria  for  such  valuation  set out in
      Section 4.1(l), or

                           (ii) if the security is registered under the Exchange
      Act,  the average of the daily  market  prices of the  security for the 20
      consecutive  trading  days  immediately  preceding  such  date or,  if the
      security  has been  registered  under  the  Exchange  Act for less than 20
      consecutive  trading days before such date,  then the average of the daily
      market prices for all of the trading days before such date for which daily
      market  prices are  available.  The market price for each such trading day
      shall be: (A) in the case of a security  listed or  admitted to trading on
      any national securities exchange, the closing sales price, regular way, on
      such day,  or if no sale  takes  place on such  day,  the  average  of the
      closing  bid and  asked  prices  on  such  day on the  principal  national
      securities  exchange  on which such  security  is listed or  admitted,  as
      determined by the Board of Directors of Newco,  in good faith,  (B) in the
      case of a security  not then listed or admitted to trading on any national
      securities  exchange,  the last  reported sale price on such day, or if no
      sale takes  place on such day,  the  average of the  closing bid and asked
      prices on such day, as reported by a reputable quotation source designated
      by Newco,  (C) in the case of a security  not then  listed or  admitted to
      trading  on any  national  securities  exchange  and as to  which  no such
      reported sale price or bid and asked prices are available,  the average of
      the  reported  high bid and low asked prices on such day, as reported by a
      reputable  quotation service, or a newspaper of general circulation in the
      Borough of Manhattan,  City and State of New York customarily published on
      each Business Day,  designated by Newco,  or, if there shall be no bid and
      asked  prices  on such  day,  the  average  of the high bid and low  asked
      prices,  as so  reported,  on the most  recent  day (not more than 30 days
      prior to the date in question)  for which prices have been so reported and
      (D) if there are no bid and asked prices reported during the 30 days prior
      to the date in question, the Current Market Value of the security shall be
      determined as if the security were not registered under the Exchange Act.

<PAGE>


                           (h) De  Minimis  Adjustments.  No  adjustment  in the
      number of Common Shares  purchasable  hereunder  shall be required  unless
      such  adjustment  would  require an  increase  or decrease of at least one
      percent (1%) in the number of Common Shares  purchasable upon the exercise
      of each Warrant;  provided,  however, that any adjustments which by reason
      of this  Section  4.1(h)  are not  required  to be made  shall be  carried
      forward  and  taken  into  account  in  any  subsequent  adjustment.   All
      calculations shall be made to the nearest one-thousandth of a share.

                           (i) Adjustment of Exercise Price. Whenever the number
      of  Common  Shares  purchasable  upon  the  exercise  of each  Warrant  is
      adjusted, as herein provided,  the Exercise Price per Common Share payable
      upon exercise of such Warrant shall be adjusted (calculated to the nearest
      $.0001) so that it shall equal the price  determined by  multiplying  such
      Exercise  Price  immediately  prior to such  adjustment  by a fraction the
      numerator of which shall be the number of Common Shares  purchasable  upon
      the exercise of each Warrant  immediately prior to such adjustment and the
      denominator  of which shall be the number of Common Shares so  purchasable
      immediately thereafter.

                      (j)           Consolidation, Merger, Etc.

                           (i)  Subject to the  provisions  of  subsection  (ii)
      below of this Section 4.1(j),  in case of the consolidation of Newco with,
      or merger of Newco  with or into,  or of the sale of all or  substantially
      all of  the  properties  and  assets  of  Newco  to,  any  Person,  and in
      connection therewith  consideration is payable to holders of Common Shares
      (or other securities or property purchasable upon exercise of Warrants) in
      exchange  therefor,  the Warrants  shall  remain  subject to the terms and
      conditions set forth in this Agreement and each Warrant shall,  after such
      consolidation, merger or sale, entitle the Holder to receive upon exercise
      the  number of shares of capital  stock or other  securities  or  property
      (including  cash)  of  Newco,  or  of  such  Person  resulting  from  such
      consolidation  or  surviving  such  merger or to which  such sale shall be
      made, as the case may be, that would have been distributable or payable on
      account of the Common Shares (or other securities or property  purchasable
      upon  exercise of Warrants) if such Holder's  Warrants had been  exercised
      immediately   prior  to  such  merger,   consolidation  or  sale  (or,  if
      applicable, the record date therefor); and in any such case the provisions
      of this Agreement  with respect to the rights and interests  thereafter of
      the Holders of Warrants  shall be  appropriately  adjusted by the Board of
      Directors of Newco in good faith so as to be applicable,  as nearly as may
      reasonably be, to any shares of stock or other  securities or any property
      thereafter deliverable on the exercise of the Warrants.

                           (ii)  Notwithstanding  the  foregoing,  (x) if  Newco
      merges or  consolidates  with,  or sells all or  substantially  all of its
      property and assets to,  another Person (other than an Affiliate of Newco)
      and  consideration  is payable to holders of Common Shares in exchange for
      their Common Shares in connection with such merger,  consolidation or 

<PAGE>

      sale  which  consists  solely  of  cash,  or  (y)  in  the  event  of  the
      dissolution,  liquidation  or  winding  up of Newco,  then the  Holders of
      Warrants  shall be entitled to receive  distributions  on the date of such
      event on an equal basis with holders of Common Shares (or other securities
      issuable  upon  exercise  of the  Warrants)  as if the  Warrants  had been
      exercised  immediately  prior  to such  event,  less the  Exercise  Price.
      Notwithstanding the foregoing,  if Newco has made, or is required to make,
      a  Repurchase  Offer  pursuant to Section  3.4 hereof and such  Repurchase
      Offer has not expired at the time of such transaction,  the Holders of the
      Warrants shall be entitled to receive the higher of (i) the amount payable
      to the holders of the Warrants as described in the preceding  sentence and
      (ii) the Repurchase Price payable to the Holders of the Warrants  pursuant
      to such Repurchase Offer. Upon receipt of such payment, if any, the rights
      of a Holder shall  terminate  and cease and such Holder's  Warrants  shall
      expire. In case of any such merger,  consolidation or sale of assets,  the
      surviving  or  acquiring  Person  and,  in the  event of any  dissolution,
      liquidation or winding up of Newco,  Newco shall deposit promptly with the
      Warrant  Agent the  funds,  if any,  necessary  to pay the  Holders of the
      Warrants.  After  receipt of such  deposit  from such  Person or Newco and
      after receipt of surrendered Warrant Certificates, the Warrant Agent shall
      make payment by delivering a check in such amount as is  appropriate  (or,
      in the case of consideration  other than cash, such other consideration as
      is appropriate) to such Person or Persons as it may be directed in writing
      by the Holder surrendering such Warrants.

                      (k) In addition to the foregoing adjustments, the Board of
Directors  of Newco may make any other  adjustment  to  increase  the  number of
Common  Shares  issuable  upon  exercise of Warrants or to decrease the Exercise
Price as it may,  in good  faith,  deem  desirable  to  protect  the  rights and
benefits of Holders.

                      (l) If required pursuant to Section 4.1(g)(i), the Current
Market  Value  shall be  deemed  to be equal to the value set forth in the Value
Report (as defined  below) as determined  by an  Independent  Financial  Expert,
which shall be  selected by the Board of  Directors  of Newco,  and  retained on
customary  terms and  conditions,  using one or more valuation  methods that the
Independent Financial Expert, in its best professional  judgment,  determines to
be most  appropriate.  Newco shall  cause the  Independent  Financial  Expert to
deliver  to  Newco,  with a copy to the  Warrant  Agent,  within  45 days of the
appointment  of the  Independent  Financial  Expert,  a value report (the "Value
Report") stating the value of the Common Shares and other securities or property
of Newco,  if any,  being valued as of the Valuation Date and containing a brief
statement as to the nature and scope of the  examination or  investigation  upon
which the  determination of value was made. The Warrant Agent shall have no duty
with respect to the Value Report of any Independent  Financial Expert, except to
keep it on file and  available  for  inspection  by the  Holders and the Warrant
Agent  shall have no duty or  responsibility  in  determining  the  accuracy  or
correctness of the calculations in such report. The determination as to value in
accordance with the provisions of this Section 4.1(l) shall be conclusive on all
Persons. The Independent Financial Expert shall consult with 

<PAGE>

management  of Newco in order to allow  management  to comment  on the  proposed
value  prior to  delivery  to  Newco  of any  Value  Report  of the  Independent
Financial Expert.

                      Section 4.2. Notice of Adjustment.  Whenever the number of
Common Shares or other stock or property  purchasable  upon the exercise of each
Warrant or the Exercise Price is adjusted, as herein provided, Newco shall cause
the  Warrant  Agent  promptly to mail,  at the expense of Newco,  to each Holder
notice of such  adjustment or adjustments and shall deliver to the Warrant Agent
a certificate of a firm of independent public accountants  selected by the Board
of  Directors  of Newco (who may be the regular  accountants  employed by Newco)
setting forth the number of Common Shares or other stock or property purchasable
upon the exercise of each Warrant and the Exercise Price after such  adjustment,
setting  forth a brief  statement of the facts  requiring  such  adjustment  and
setting  forth  the   computation  by  which  such  adjustment  was  made.  Such
certificate shall be conclusive  evidence of the correctness of such adjustment.
The Warrant  Agent shall be  entitled to rely on such  certificate  and shall be
under no duty or responsibility with respect to any such certificate,  except to
exhibit  the same,  from time to time,  to any  Holder  desiring  an  inspection
thereof during  reasonable  business  hours.  The Warrant Agent shall not at any
time be under any duty or responsibility to any Holders to determine whether any
facts exist which may require any adjustment of the Exercise Price or the number
of Common Shares or other securities or property  purchasable on exercise of the
Warrants,  or with respect to the nature or extent of any such  adjustment  when
made, or with respect to the method employed in making such  adjustment,  or the
validity  or  value  (or the  kind or  amount)  of any  Common  Shares  or other
securities or property which may be purchasable on exercise of the Warrants. The
Warrant Agent shall not be responsible for any failure of Newco to make any cash
payment or to issue,  transfer or deliver any Common Shares or other  securities
or property upon the exercise of any Warrant.

                      Section 4.3.  Statement on Warrants.  Irrespective  of any
adjustment  in the  Exercise  Price or the number or kind of shares  purchasable
upon the exercise of the Warrants, Warrants theretofore or thereafter issued may
continue  to express  the same price and number and kind of shares as are stated
in the Warrants initially issuable pursuant to this Agreement.

                      Section 4.4. Notice of Consolidation, Merger, Etc. In case
at any time after the date hereof and prior to 5:00 p.m., New York City time, on
the Expiration  Date,  there shall be any (i)  consolidation or merger involving
Newco or sale,  transfer or other  disposition  of all or  substantially  all of
Newco's property, assets or business (except a merger or other reorganization in
which Newco shall be the surviving  corporation and holders of Common Shares (or
other securities or property  purchasable upon exercise of the Warrants) receive
no  consideration  in  respect of their  shares)  or (ii) any other  transaction
contemplated by Section 4.1(i)(ii) above, then in any one or more of such cases,
Newco  shall  cause to be  mailed  to the  Warrant  Agent  and each  Holder of a
Warrant,  at the earliest  practicable time (and, in any event, not less than 20
calendar days before any date set for definitive action),  notice of the date on
which such reorganization, sale, consolidation, merger, dissolution, liquidation
or winding up shall take 

<PAGE>

place,  as the case may be. Such notice shall also set forth such facts as shall
indicate  the effect of such  action (to the extent  such effect may be known at
the date of such notice) on the Exercise Price and the kind and amount of Common
Shares and other securities,  money and other property deliverable upon exercise
of the Warrants. Such notice shall also specify the date as of which the holders
of record of the Common  Shares or other  securities  or property  issuable upon
exercise  of the  Warrants  shall be  entitled  to  exchange  their  shares  for
securities, money or other property deliverable upon such reorganization,  sale,
consolidation,  merger, dissolution,  liquidation or winding up, as the case may
be.

                      Section  4.5.  Fractional  Interests.  If  more  than  one
Warrant  shall be  presented  for  exercise in full at the same time by the same
Holder,  the number of full Common  Shares  which  shall be  issuable  upon such
exercise  thereof  shall be  computed  on the basis of the  aggregate  number of
Common  Shares  purchasable  on exercise of the  Warrants so  presented.  If any
fraction of an Common Share  would,  except for the  provisions  of this Section
4.5, be issuable on the exercise of any Warrant (or specified  portion thereof),
Newco  shall  pay an  amount  in cash  calculated  by it to be equal to the then
Current  Market Value per Common Share  multiplied by such fraction  computed to
the nearest whole cent.


                                    ARTICLE V
                           DECREASE IN EXERCISE PRICE

                      The Board of Directors of Newco,  in its sole  discretion,
shall have the right at any time, or from time to time, to decrease the Exercise
Price of the Warrants,  such reduction of the Exercise Price to be effective for
a period or periods to be determined by it, but in no event for a period of less
than 30 calendar  days.  Any  exercise by the Board of Directors of Newco of any
rights granted in this Article V must be preceded by a written notice from Newco
to each  Holder of the  Warrants  and to the  Warrant  Agent  setting  forth the
reduction  in the  Exercise  Price,  which  notice  shall be  mailed at least 30
calendar  days prior to the  effective  date of such  decrease  in the  Exercise
Price.  Any  reduction  of the Exercise  Price  pursuant to  provisions  of this
Article  V shall  not alter or  adjust  the  number  of  Common  Shares or other
securities or property issuable upon the exercise of the Warrants.

                                 ARTICLE VI
                               LOSS OR MUTILATION

                      Upon  receipt by Newco and the  Warrant  Agent of evidence
satisfactory  to them of the  ownership  and the  loss,  theft,  destruction  or
mutilation of any Warrant Certificate and of indemnity  satisfactory to them and
(in the case of mutilation)  upon surrender and cancellation  thereof,  then, in
the  absence  of  notice  to  Newco  or the  Warrant  Agent  that  the  Warrants
represented  thereby have been  acquired by a bona fide  purchaser,  Newco shall
execute and the 

<PAGE>

Warrant  Agent shall  countersign  and deliver to the  registered  Holder of the
lost, stolen, destroyed or mutilated Warrant Certificate,  in exchange for or in
lieu  thereof,  a new  Warrant  Certificate  of the  same  tenor  and for a like
aggregate number of Warrants.  Upon the issuance of any new Warrant  Certificate
under this  Article VI,  Newco may require  the payment of a sum  sufficient  to
cover any tax or other  governmental  charge  that may be  imposed  in  relation
thereto  and other  expenses  (including  the fees and  expenses  of the Warrant
Agent) in  connection  therewith.  Every new Warrant  Certificate  executed  and
delivered  pursuant to this Article VI in lieu of any lost,  stolen or destroyed
Warrant Certificate shall constitute a contractual  obligation of Newco, whether
or not the allegedly lost, stolen or destroyed Warrant  Certificates shall be at
any time  enforceable  by anyone,  and shall be entitled to the benefits of this
Agreement   equally  and   proportionately   with  any  and  all  other  Warrant
Certificates  duly  executed and  delivered  hereunder.  The  provisions of this
Article VI are  exclusive  and shall  preclude (to the extent  lawful) all other
rights or remedies with respect to the replacement of mutilated,  lost,  stolen,
or destroyed Warrant Certificates.


                                   ARTICLE VII
                          AUTHORIZATION AND RESERVATION
                                OF COMMON SHARES

                      Newco shall at all times  reserve and keep  available  for
issue upon the exercise of Warrants such number of its  authorized  but unissued
Common Shares or other securities of Newco deliverable upon exercise of Warrants
as will be sufficient to permit the exercise in full of all outstanding Warrants
and will cause appropriate  evidence of ownership of such Common Shares or other
securities  of Newco to be delivered  to the Warrant  Agent upon its request for
delivery upon the exercise of Warrants,  and all such Common Shares will, at all
times,  be duly approved for listing  subject to official  notice of issuance on
each securities  exchange,  if any, on which such Common Shares are then listed.
Newco covenants that all Common Shares or other  securities of Newco that may be
issued  upon  the  exercise  of  the  Warrants  will,  upon  issuance,  be  duly
authorized,  validly  issued,  fully paid and not subject to any calls for funds
and nonassessable,  and free from preemptive or similar rights (other than those
validly and  effectively  waived)  and all taxes,  liens,  charges and  security
interests.

                                  ARTICLE VIII
                                 WARRANT HOLDERS

                      Section  8.1.  Warrant  Holder Not  Deemed a  Stockholder.
Newco and the Warrant Agent may deem and treat the  registered  Holder(s) of the
Warrant  Certificates  as the absolute  owner(s)  thereof  (notwithstanding  any
notation of ownership or other writing thereon made by anyone),  for the purpose
of any exercise  thereof and for all other  purposes,  and neither Newco nor the
Warrant  Agent  shall be affected  by any notice to the  contrary.  Prior to the
exercise of the Warrants, no Holder of a Warrant Certificate,  as such, shall be
entitled to any 

<PAGE>

rights of a stockholder of Newco,  including,  without limitation,  the right to
vote or to consent to any action of the  stockholders,  to receive  dividends or
other  distributions,  to exercise any preemptive right or to receive any notice
of meetings of stockholders and, except as otherwise provided in this Agreement,
shall not be entitled to receive any notice of any proceedings of Newco.

                      Section  8.2.  Right of Action.  All rights of action with
respect to this  Agreement  are vested in the Holders of the  Warrants,  and any
Holder of any Warrant,  without the consent of the Warrant  Agent or the Holders
of any other Warrant,  may, in his own behalf and for his own benefit,  enforce,
and may  institute  and maintain any suit,  action or  proceeding  against Newco
suitable  to enforce,  or  otherwise  in respect  of, his right to exercise  his
Warrants  in the manner  provided in the Warrant  Certificate  representing  his
Warrants and in this Agreement.


                                   ARTICLE IX
                                    REMEDIES

                      Section  9.1.  Defaults.  It  shall  be  deemed  to  be  a
"Default" with respect to Newco's (or its  successor's)  obligations  under this
Agreement if:

                      (a) a Repurchase Event occurs and Newco (or its successor)
shall fail to make a Repurchase Offer pursuant to Section 3.4 hereof; or

                      (b) Newco (or its  successor)  shall fail to purchase  the
Warrants  pursuant to the Repurchase  Offer in accordance with the provisions of
Section 3.4 hereof.

                      Section 9.2. Payment Obligations.  Upon the happening of a
Default  under this  Agreement,  Newco shall be obligated to increase the amount
otherwise payable pursuant to Section 3.4(d) hereof in respect of the Repurchase
Offer to which such Default relates by an amount equal to interest  thereon at a
rate  per  annum  equal to [__]%  from  the date of the  Default  to the date of
payment,  which interest shall compound quarterly (all such payment  obligations
in respect of such Repurchase Offer,  together with all such increased  amounts,
being the "Repurchase Obligation").

                      Section  9.3.  Remedies;  No Waiver.  Notwithstanding  any
other  provision  of  this  Warrant  Agreement,  if  a  Default  occurs  and  is
continuing,  the  Holders of the  Warrants  may pursue any  available  remedy to
collect the Repurchase Obligation or to enforce the performance of any provision
of this  Warrant  Agreement.  A delay or  omission by any Holder of a Warrant in
exercising,  or a failure  to  exercise,  any right or remedy  arising  out of a
Default  shall not  impair  the right or  remedy  or  constitute  a waiver of or
acquiescence in the Default. All remedies are cumulative to the extent permitted
by law.

<PAGE>

                                    ARTICLE X
                                THE WARRANT AGENT

                      Section 10.1.  Duties and  Liabilities.  The Warrant Agent
hereby  accepts the agency  established  by this Agreement and agrees to perform
the same upon the terms and conditions  herein set forth,  by all of which Newco
and the Holders of Warrants,  by their acceptance  thereof,  shall be bound. The
Warrant Agent shall not, by countersigning  Warrant Certificates or by any other
act  hereunder,  be deemed to make any  representations  as to the  validity  or
authorization  of the  Warrants  or the Warrant  Certificates  (except as to its
countersignature  thereon) or of any securities or other property delivered upon
exercise or repurchase of any Warrant,  or as to the accuracy of the computation
of the  Exercise  Price  or the  number  or kind or  amount  of  stock  or other
securities  or other  property  deliverable  upon  exercise or repurchase of any
Warrant,  or as to the  independence of any Independent  Financial Expert or the
correctness of the  representations  of Newco made in the certificates  that the
Warrant Agent  receives.  The Warrant Agent shall not be accountable for the use
or  application  by Newco of the proceeds of the  exercise of any  Warrant.  The
Warrant Agent shall not have any duty to calculate or determine any  adjustments
with  respect to either the  Exercise  Price or the kind and amount of shares or
other  securities  or any  property  receivable  by Holders upon the exercise or
repurchase  of Warrants  required  from time to time and the Warrant Agent shall
have no duty or  responsibility  in  determining  the accuracy or correctness of
such  calculation.  The Warrant Agent shall not be (a) liable for any recital or
statement of fact  contained  herein or in the Warrant  Certificates  or for any
action  taken,  suffered  or omitted by it in good faith in the belief  that any
Warrant  Certificate  or any other  documents or any  signatures  are genuine or
properly  authorized,  (b)  responsible  for any failure on the part of Newco to
comply with any of its covenants and obligations  contained in this Agreement or
in the Warrant  Certificates or (c) liable for any act or omission in connection
with this Agreement except for its own gross  negligence or willful  misconduct.
The Warrant Agent is hereby  authorized to accept  instructions  with respect to
the performance of its duties  hereunder from the Chief Executive  Officer,  the
President,  any Vice President,  the Chief Financial Officer or the Secretary or
Treasurer  of Newco and to apply to any such  officer  for  instructions  (which
instructions  will be promptly given in writing when  requested) and the Warrant
Agent shall not be liable for any action  taken or suffered to be taken by it in
good faith in accordance with the instructions of any such officer;  however, in
its  discretion,  the Warrant Agent may in lieu thereof accept other evidence of
such  or may  require  such  further  or  additional  evidence  as it  may  deem
reasonable.  The  Warrant  Agent  shall not be liable for any action  taken with
respect to any  matter in the event it  requests  instructions  from Newco as to
that matter and does not receive such instructions within a reasonable period of
time after the request therefor.

                      The  Warrant  Agent may execute  and  exercise  any of the
rights  and powers  hereby  vested in it or perform  any duty  hereunder  either
itself or by or through  its  attorneys,  agents or  employees,  and the Warrant
Agent shall not be answerable or accountable  for any act,  default,  neglect or
misconduct of any such attorneys, agents or employees,  provided reasonable care
has 

<PAGE>

been  exercised in the  selection  and in the  continued  employment of any such
attorney, agent or employee. The Warrant Agent shall not be under any obligation
or duty to institute,  appear in or defend any action,  suit or legal proceeding
in respect  hereof,  unless  first  indemnified  to its  satisfaction,  but this
provision shall not affect the power of the Warrant Agent to take such action as
the Warrant Agent may consider  proper,  whether with or without such indemnity.
The Warrant  Agent shall  promptly  notify Newco in writing of any claim made or
action, suit or proceeding instituted against it arising out of or in connection
with this Agreement.

                      Newco will perform,  execute,  acknowledge  and deliver or
cause to be delivered all such further acts,  instruments  and assurances as are
consistent  with this Agreement and as may reasonably be required by the Warrant
Agent in order to  enable it to carry  out or  perform  its  duties  under  this
Agreement.

                      The  Warrant  Agent  shall  act  solely  as agent of Newco
hereunder.  The  Warrant  Agent  shall not be liable  except for the  failure to
perform  such  duties as are  specifically  set  forth  herein,  and no  implied
covenants or obligations  shall be read into this Agreement  against the Warrant
Agent,  whose duties and obligations  shall be determined  solely by the express
provisions hereof.

                      Section 10.2. Right to Consult Counsel.  The Warrant Agent
may at any time consult with legal counsel (who may be legal counsel for Newco),
and  the  opinion  or  advice  of  such  counsel  shall  be  full  and  complete
authorization  and  protection  to the Warrant Agent and the Warrant Agent shall
incur no  liability or  responsibility  to Newco or to any Holder for any action
taken, suffered or omitted by it in good faith in accordance with the opinion or
advice of such counsel.

                      Section 10.3. Compensation;  Indemnification. Newco agrees
promptly  to pay the Warrant  Agent from time to time,  on demand of the Warrant
Agent,  compensation  for its services  hereunder as Newco and the Warrant Agent
may agree from time to time,  and to  reimburse it for  reasonable  expenses and
counsel fees incurred in connection  with the  execution and  administration  of
this  Agreement,  and further  agrees to indemnify the Warrant Agent and save it
harmless  against  any  losses,  liabilities  or  expenses  arising out of or in
connection with the acceptance and  administration of this Agreement,  including
the  costs  and  expenses  of  investigating  or  defending  any  claim  of such
liability,  except that Newco shall have no  liability  hereunder  to the extent
that any such loss,  liability or expense  results from the Warrant  Agent's own
gross  negligence or willful  misconduct.  The  obligations  of Newco under this
Section  shall  survive the exercise and the  expiration of the Warrants and the
resignation or removal of the Warrant Agent.

                      Section  10.4.  No  Restrictions  on Actions.  The Warrant
Agent and any  stockholder,  director,  officer or employee of the Warrant Agent
may buy,  sell or deal in any of the  Warrants or other  securities  of Newco or
become pecuniarily  interested in transactions in 

<PAGE>

which  Newco  may be  interested,  or  contract  with or lend  money to Newco or
otherwise  act as fully and freely as though it were not the Warrant Agent under
this  Agreement.  Nothing herein shall preclude the Warrant Agent from acting in
any other capacity for Newco or for any other legal entity.

                      Section 10.5.  Discharge or Removal;  Replacement  Warrant
Agent.  The Warrant Agent may resign from its position as such and be discharged
from all further duties and liabilities hereunder (except liability arising as a
result of the Warrant Agent's own gross negligence or willful misconduct), after
giving one month's prior written  notice to Newco.  Newco may remove the Warrant
Agent upon one month's  written  notice  specifying the date when such discharge
shall take  effect,  and the  Warrant  Agent shall  thereupon  in like manner be
discharged  from  all  further  duties  and  liabilities  hereunder,  except  as
aforesaid.  Newco shall cause to be mailed to each Holder of a Warrant a copy of
said notice of resignation  or notice of removal,  as the case may be. Upon such
resignation  or removal Newco shall appoint in writing a new warrant  agent.  If
Newco shall fail to make such  appointment  within a period of 30 calendar  days
after it has been  notified  in writing  of such  resignation  by the  resigning
Warrant  Agent or after such removal,  then the  resigning  Warrant Agent or the
Holder of any Warrant may apply to any court of competent  jurisdiction  for the
appointment  of a new warrant agent.  Pending  appointment of a successor to the
original  Warrant Agent,  either by Newco or by such a court,  the duties of the
Warrant  Agent shall be carried out by Newco.  Any new  warrant  agent,  whether
appointed by Newco or by such a court,  shall be a bank or trust  company  doing
business  under the laws of the  United  States or any  state  thereof,  in good
standing and having a combined capital and surplus of not less than $25,000,000.
The combined  capital and surplus of any such new warrant  agent shall be deemed
to be the  combined  capital and surplus as set forth in the most recent  annual
report  of  its  condition   published  by  such  warrant  agent  prior  to  its
appointment, provided that such reports are published at least annually pursuant
to law or to the  requirements  of a federal or state  supervising  or examining
authority.  After  acceptance in writing of such  appointment by the new warrant
agent,   it  shall  be  vested  with  the  same  powers,   rights,   duties  and
responsibilities as if it had been originally named herein as the Warrant Agent,
without any further assurance,  conveyance,  act or deed; however,  the original
Warrant Agent shall in all events deliver and transfer to the successor  Warrant
Agent all property,  if any, at the time held hereunder by the original  Warrant
Agent and if for any reason it shall be  necessary  or  expedient to execute and
deliver any further assurance,  conveyance,  act or deed, the same shall be done
at the expense of Newco and shall be legally and validly  executed and delivered
by the resigning or removed Warrant Agent.  Not later than the effective date of
any such  appointment,  Newco shall file notice  thereof  with the  resigning or
removed  Warrant  Agent and shall  forthwith  cause a copy of such  notice to be
mailed to each Holder of a Warrant.  Failure to give any notice  provided for in
this Section 10.5, however, or any defect therein, shall not affect the legality
or validity of the  resignation of the Warrant Agent or the appointment of a new
warrant agent, as the case may be.


<PAGE>

                      Section 10.6.  Successor  Warrant Agent.  Any  corporation
into which the  Warrant  Agent or any new  warrant  agent may be merged,  or any
corporation  resulting from any  consolidation to which the Warrant Agent or any
new warrant  agent shall be a party,  shall be a successor  Warrant  Agent under
this Agreement  without any further act, provided that such corporation would be
eligible for  appointment as successor to the Warrant Agent under the provisions
of Section 10.5 hereof.  Any such  successor  Warrant Agent shall promptly cause
notice of its  succession  as  Warrant  Agent to be  mailed to each  Holder of a
Warrant.


                                   ARTICLE XI
                                  REGISTRATION

                      Section   11.1.    Effectiveness   and   Availability   of
Registration  Statement.  (a) Newco shall use its best  efforts to maintain  the
effectiveness  of  the  registration  statement  covering  the  issuance  of the
Underlying  Securities (the  "Registration  Statement") until the earlier of (i)
such time as all Warrants have been exercised and (ii) [__________], 2007. Prior
to filing any  amendment to the  Registration  Statement,  Newco shall provide a
copy thereof to Morgan Stanley and its counsel and afford them a reasonable time
to  comment  thereon.   Newco  will  furnish  the  Warrant  Agent  with  current
prospectuses  meeting the  requirements  of the Securities Act and the rules and
regulations  of the Commission  thereunder in sufficient  quantity to permit the
Warrant Agent to deliver,  at Newco's expense,  a prospectus to each Holder of a
Warrant upon the exercise thereof. Newco shall promptly inform the Warrant Agent
of any  change  in  the  status  of the  effectiveness  or  availability  of the
Registration Statement.

                      (b)  Newco  shall use its best  efforts  to  register  the
Underlying Securities on the Nasdaq Stock Market by [__________], 1997.

                      Section 11.2.  Suspension.  Notwithstanding the foregoing,
during any consecutive 365-day period, Newco shall have the privilege to suspend
availability  of the  Registration  Statement  for up to two  15-consecutive-day
periods,  except during the 30-day period  immediately  prior to the  Expiration
Date,  if Newco's  Board of Directors  determines  in good faith that there is a
valid  business  purpose  for  such  suspension  and  provides  notice  of  such
determination  to the Holders at their  addresses  appearing  in the register of
Warrants maintained by the Warrant Agent.

                      Section 11.3.  Blue Sky.  Newco shall use its best efforts
to register or qualify the Underlying Securities under all applicable securities
or "blue  sky" laws of all  jurisdictions  in the  United  States and Canada and
shall use its best  efforts  to  maintain  such  registration  or  qualification
through the earlier of the date upon which all Warrants have been  exercised and
[__________],  2007; provided,  however, that Newco shall not be required to (i)
qualify  as  a  foreign  corporation  or  as  a  dealer  in  securities  in  any
jurisdiction  where it would not  otherwise  

<PAGE>

be required to qualify but for this Section 11.3,  (ii) file any general consent
to service of process or (iii) subject itself to taxation in any jurisdiction if
it is not otherwise so subject.

                      Section 11.4. Accuracy of Disclosure. Newco represents and
warrants  to each  Holder and agrees for the benefit of each Holder that (i) the
Registration  Statement and the documents incorporated by reference therein will
not contain any untrue  statement of a material fact or omit to state a material
fact  necessary  to make the  statements  therein not  misleading;  and (ii) the
prospectus  delivered  to such  Holder upon its  exercise  of  Warrants  and the
documents  incorporated  by  reference  therein  will  not  contain  any  untrue
statement of a material fact or omit to state a material fact  necessary to make
the  statements  therein,  in light of the  circumstances  under which they were
made, not misleading.

                      Section 11.5.  Indemnity.  Newco hereby  indemnifies  each
beneficial  owner of a Warrant  (whether or not it is, at the time the indemnity
provided for in this Section 11.5 is sought,  such a beneficial  owner)  against
all losses,  damages or  liabilities  which such  beneficial  owner suffers as a
result  of any  breach,  on the  date  of any  exercise  of a  Warrant  by  such
beneficial owner, of the representations,  warranties or agreements contained in
Section 11.4.

                      Section 11.6.  Expenses.  All expenses incident to Newco's
performance of or compliance with its  obligations  under this Agreement will be
borne  by  Newco,   regardless  of  whether  a  Registration  Statement  becomes
effective,  including without limitation: (i) all Commission,  stock exchange or
National Association of Securities Dealers,  Inc.  registration and filing fees,
(ii) all fees and expenses  incurred in connection  with  compliance  with state
securities or "blue sky" laws,  (iii) all expenses of any Persons incurred by or
on behalf of Newco in  preparing or assisting  in  preparing,  word  processing,
printing and  distributing  any  registration  statement,  any  prospectus,  any
amendments  or  supplements   thereto  and  other  documents   relating  to  the
performance  of  and  compliance  with  this   Agreement,   (iv)  the  fees  and
disbursements  of the Warrant Agent,  (v) the fees and  disbursements of counsel
for  Newco and the  Warrant  Agent  and (vi) the fees and  disbursements  of the
independent public  accountants of Newco,  including the expenses of any special
audits or "cold comfort" letters required by or incident to such performance and
compliance.

                      Section 11.7.  Additional Acts. If the issuance or sale of
any Common Shares or other securities issuable upon the exercise of the Warrants
require  registration or approval of any governmental  authority (other than the
registration  requirements under the Securities Act), or the taking of any other
action  under  the  laws  of the  United  States  of  America  or any  political
subdivision  thereof before such  securities  may be validly  offered or sold in
compliance  with such laws, then Newco covenants that it will, in good faith and
as expeditiously as reasonably practicable, endeavor to secure and maintain such
registration or approval or to take such other action, as the case may be.


<PAGE>

                                   ARTICLE XII
                                  MISCELLANEOUS

                      Section 12.1.  Money Deposited with the Warrant Agent. The
Warrant  Agent  shall not be required  to pay  interest on any moneys  deposited
pursuant to the  provisions of this  Agreement  except such as it shall agree in
writing  with Newco to pay thereon.  Any moneys,  securities  or other  property
which at any time shall be  deposited by Newco or on its behalf with the Warrant
Agent pursuant to this Agreement shall be and are hereby  assigned,  transferred
and set over to the  Warrant  Agent in trust  for the  purpose  for  which  such
moneys, securities or other property shall have been deposited; but such moneys,
securities or other property need not be segregated from other funds, securities
or other property except to the extent required by law. Any money, securities or
other property  deposited with the Warrant Agent for payment or  distribution to
the  Holders  that  remains  unclaimed  for two years  after the date the money,
securities  or other  property  was  deposited  with the Warrant  Agent shall be
delivered to Newco upon its request therefor.

                      Section 12.2. Payment of Taxes. All Common Shares or other
securities issuable upon the exercise of Warrants shall be validly issued, fully
paid and not  subject to any calls for funds,  and Newco shall pay any taxes and
other  governmental  charges  that may be  imposed  under the laws of the United
States of America or any political  subdivision or taxing  authority  thereof or
therein  in  respect of the issue or  delivery  thereof  or of other  securities
deliverable  upon  exercise of Warrants  or in respect of any  Repurchase  Offer
(other than income taxes imposed on the  Holders).  Newco shall not be required,
however,  to pay any tax or other charge imposed in connection with any transfer
involved in the issue of any certificate  for Common Shares or other  securities
or  property  issuable  upon the  exercise  of the  Warrants  or in respect of a
Repurchase  Offer or payment  of cash to any  Person  other than the Holder of a
Warrant Certificate surrendered upon the exercise or repurchase of a Warrant and
in case of such  transfer or payment,  the Warrant  Agent and Newco shall not be
required to issue any stock certificate or pay any cash until such tax or charge
has been paid or it has been  established  to the  Warrant  Agent's  and Newco's
satisfaction that no such tax or charge is due.

                      Section 12.3. No Merger,  Consolidation  or Sale of Assets
of Newco.  Except as  otherwise  provided  herein,  Newco will not merge into or
consolidate with any other Person,  or sell or otherwise  transfer its property,
assets and business substantially as an entirety to a successor of Newco, unless
the Person  resulting  from such merger or  consolidation,  or such successor of
Newco, shall expressly assume, by supplemental agreement satisfactory in form to
the Warrant Agent and executed and delivered to the Warrant  Agent,  the due and
punctual  performance and observance of each and every covenant and condition of
this Agreement to be performed and observed by Newco.

                      Section  12.4.  Reports to Holders.  Newco shall file with
the  Commission  the annual,  quarterly  and other  reports  required by Section
13(a),  13(c) or 15(d) of the Exchange 

<PAGE>

Act,  regardless of whether such Sections of the Exchange Act are  applicable to
Newco, and shall, at its expense, provide copies of such reports to each Holder,
without cost to such Holder,  and the Warrant  Agent within seven days after the
date it would have been required to file such reports or other  information with
the Commission had it been subject to such sections.

                      Section 12.5. Notices. (a) Except as otherwise provided in
Section  12.5(b)  hereof,  any  notice,  demand or delivery  authorized  by this
Agreement  shall be  sufficiently  given or made when  mailed,  if sent by first
class  mail,  postage  prepaid,  addressed  to any  Holder of a Warrant  at such
Holder's last known address appearing on the register of Newco maintained by the
Warrant Agent and to Newco or the Warrant Agent as follows:

                      To Newco:

                      Orion Newco Services, Inc.
                      2440 Research Boulevard, Suite 40
                      Rockville, MD 20850
                      Attention: [Chief Financial Officer]

                      To the Warrant Agent:

                      Bankers Trust Company
                      4 Albany Street
                      New York, New York 10006
                      Attention:  Corporate Trust and Agency Group

or such other address as shall have been furnished to the party giving or making
such notice, demand or delivery.  Any notice that is mailed in the manner herein
provided  shall be  conclusively  presumed to have been duly given when  mailed,
whether or not the Holder receives the notice.

                      (b) Any  notice  required  to be  given  by  Newco  to the
Holders pursuant to Section 3.4(b) hereof shall be made by mailing by registered
mail,  return receipt  requested,  to the Holders at their last known  addresses
appearing  on  the  register  maintained  by the  Warrant  Agent.  Newco  hereby
irrevocably  authorizes  the  Warrant  Agent,  in the name and at the expense of
Newco, to mail any such notice upon receipt thereof from Newco.  Any notice that
is mailed in the manner herein provided shall be  conclusively  presumed to have
been duly given when mailed, whether or not the Holder receives the notice.

                      Section  12.6.  Governing  Law.  This  Agreement  shall be
governed by the laws of the State of New York.

<PAGE>

                      Section 12.7.  Binding  Effect.  This  Agreement  shall be
binding  upon and inure to the benefit of Newco and the Warrant  Agent and their
respective  successors  and  assigns,  and the Holders  from time to time of the
Warrants.  Nothing in this Agreement is intended or shall be construed to confer
upon any  Person,  other than Newco,  the  Warrant  Agent and the Holders of the
Warrants, any right, remedy or claim under or by reason of this Agreement or any
part hereof.

                      Section 12.8. Counterparts. This Agreement may be executed
manually or by facsimile in any number of  counterparts,  each of which shall be
deemed  an  original,  but all of  which  together  constitute  one and the same
instrument.

                      Section 12.9.  Amendments.  The Warrant Agent may, without
the consent or  concurrence  of the  Holders of the  Warrants,  by  supplemental
agreement or otherwise,  join with Newco in making any changes or corrections in
this  Agreement  that (a) are  required to cure any  ambiguity or to correct any
defective or inconsistent  provision or clerical omission or mistake or manifest
error herein  contained or (b) add to the covenants  and  agreements of Newco in
this  Agreement  further  covenants  and  agreements  of Newco  thereafter to be
observed,  or surrender any rights or power  reserved to or conferred upon Newco
in this  Agreement;  provided that in either case such changes or corrections do
not and will not  adversely  affect,  alter or change the rights,  privileges or
immunities of the Holders of Warrants.  Amendments or  supplements  which do not
meet the  requirements  of the  preceding  sentence  shall  require  the written
consent of the Holders of a majority of the then outstanding Warrants; provided,
however,  that the  consent of each  Holder is  required  for any  amendment  or
supplement pursuant to which the Exercise Price would be increased or the number
of Common  Shares  purchasable  upon  exercises  of Warrants  would be decreased
(other  than  pursuant  to  adjustments  as  provided  in  Article  IV  of  this
Agreement).

                      Section 12.10.  Headings.  The descriptive headings of the
several  Sections of this Agreement are inserted for convenience  only and shall
not  control or affect  the  meaning or  construction  of any of the  provisions
hereof.

                      Section 12.11. Common Shares Legend. In the event a Holder
exercises  its  Warrants  at a  time  when  the  Registration  Statement  is not
effective  and  available   pursuant  to  an  exemption  from  the  registration
requirements  of the  Securities  Act, any Common Shares or other  securities of
Newco issuable upon exercise of such Warrants shall bear the following legend:

      THE COMMON SHARES [OR OTHER SECURITIES] EVIDENCED BY THIS CERTIFICATE HAVE
      NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933 (THE "SECURITIES
      ACT") AND  ACCORDINGLY MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED STATES
      OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S.  PERSONS EXCEPT AS SET FORTH
      IN THE FOLLOWING  SENTENCE.  BY ITS ACQUISITION  HEREOF, THE HOLDER 

<PAGE>

      AGREES THAT (1) IT WILL NOT, WITHIN THE TIME PERIOD REFERRED TO UNDER RULE
      144(k)  (TAKING INTO ACCOUNT THE  PROVISIONS OF RULE 144(d) IF APPLICABLE)
      UNDER THE  SECURITIES ACT AS IN EFFECT WITH RESPECT TO THE TRANSFER OF THE
      COMMON SHARES [OR OTHER SECURITIES]  EVIDENCED HEREBY, RESELL OR OTHERWISE
      TRANSFER THE COMMON SHARES [OR OTHER  SECURITIES]  EVIDENCED HEREBY EXCEPT
      (A) TO NEWCO OR ANY SUBSIDIARY THEREOF,  (B) INSIDE THE UNITED STATES TO A
      QUALIFIED  INSTITUTIONAL  BUYER IN  COMPLIANCE  WITH RULE  144A  UNDER THE
      SECURITIES  ACT, (C) OUTSIDE THE UNITED STATES IN AN OFFSHORE  TRANSACTION
      IN COMPLIANCE  WITH RULE 904 UNDER THE SECURITIES ACT, (D) PURSUANT TO THE
      EXEMPTION FROM REGISTRATION  PROVIDED BY RULE 144 UNDER THE SECURITIES ACT
      (IF  AVAILABLE),   (E)  INSIDE  THE  UNITED  STATES  TO  AN  INSTITUTIONAL
      "ACCREDITED  INVESTOR" (AS DEFINED IN RULE  501(a)(1),  (2), (3) OR (7) OF
      REGULATION  D UNDER THE  SECURITIES  ACT)  THAT,  PRIOR TO SUCH  TRANSFER,
      FURNISHES   TO  THE   REGISTRAR  A  SIGNED   LETTER   CONTAINING   CERTAIN
      REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF
      THE COMMON  SHARES [OR OTHER  SECURITIES]  EVIDENCED  HEREBY  (THE FORM OF
      WHICH  LETTER CAN BE OBTAINED  FROM THE  REGISTRAR)  AND, IF  REQUESTED BY
      NEWCO, AN OPINION OF COUNSEL  ACCEPTABLE TO NEWCO THAT SUCH TRANSFER IS IN
      COMPLIANCE  WITH THE  SECURITIES ACT OR (F) AFTER  REGISTRATION  UNDER THE
      SECURITIES  ACT AND (2) IT WILL  DELIVER TO EACH PERSON TO WHOM THE COMMON
      SHARES [OR OTHER  SECURITIES]  EVIDENCED  HEREBY ARE  TRANSFERRED A NOTICE
      SUBSTANTIALLY  TO THE EFFECT OF THIS  LEGEND.  AS USED  HEREIN,  THE TERMS
      "OFFSHORE  TRANSACTION,"  "UNITED  STATES"  AND  "U.S.  PERSON"  HAVE  THE
      MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

                      Section  12.12.  Third  Party  Beneficiaries.  The Holders
shall be third party  beneficiaries  to the agreements  made  hereunder  between
Newco,  on the one hand,  and the Warrant  Agent,  on the other  hand,  and each
Holder shall have the right to enforce such agreements directly to the extent it
deems such  enforcement  necessary  or  advisable  to protect  its rights or the
rights of Holders hereunder.

                      Section 12.13. Submission to Jurisdiction;  Appointment of
Agent for Service.  By the execution and delivery of this  Agreement,  Newco (i)
acknowledges that it has, by separate written instrument, irrevocably designated
and appointed  [NAME AND ADDRESS OF AGENT]  (together  with any  successor,  the
"Authorized Agent"), as its authorized agent upon which process may be served in
any  suit or  proceeding  arising  out of or  relating  to this  Agreement,  the
Warrants or the Underlying  Securities  that may be instituted in any federal or

<PAGE>

                      state  court  in  the  State  of  New  York,   Borough  of
Manhattan,  or brought under federal or state  securities laws, and acknowledges
that the  Authorized  Agent has accepted such  designation,  (ii) submits to the
non-exclusive jurisdiction of any such court in any such suit or proceeding, and
waives any objection  which it may now or hereafter  have to the laying of venue
of any such proceeding or any claim of inconvenient  forum and (iii) agrees that
service of process upon the Authorized  Agent and written notice of said service
to Newco  (mailed or delivered to [its Chief  Financial  Officer] at the address
provided in Section 12.5, shall be deemed in every respect  effective service of
process upon Newco in any such suit or proceeding.  Newco further agrees to take
any and all  action,  including  the  execution  and  filing of any and all such
documents and instruments,  as may be necessary to continue such designation and
appointment of the  Authorized  Agent in full force and effect so long as any of
the Warrants or Underlying Securities shall be outstanding.

                      To the extent that Newco has or hereafter  may acquire any
immunity  from  jurisdiction  of any  court or from any legal  process  (whether
through service of notice,  attachment  prior to judgment,  attachment in aid of
execution,  execution or otherwise)  with respect to itself or its property,  it
hereby  irrevocably waives such immunity in respect of its obligations under the
above-referenced documents, to the extent permitted by law.




<PAGE>

                      IN WITNESS WHEREOF, the parties have caused this Agreement
to be duly executed, as of the day and year first above written.


                                         ORION NEWCO SERVICES, INC.


                                         By:
                                             -----------------------------------
                                             Name:
                                             Title:


                                         BANKERS TRUST COMPANY, as Warrant Agent

                                         By:  
                                             -----------------------------------
                                             Name:
                                             Title:



<PAGE>
                                                                       EXHIBIT A

                           FORM OF WARRANT CERTIFICATE


[THE WARRANTS  EVIDENCED BY THIS CERTIFICATE WERE INITIALLY ISSUED AS PART OF AN
ISSUANCE OF SENIOR NOTE UNITS  (CUSIP NO.  [______])  AND SENIOR  DISCOUNT  NOTE
UNITS  (CUSIP  NO.  [_______]),  EACH  SENIOR  NOTE  UNIT OF WHICH  CONSISTS  OF
$[_______] PRINCIPAL AMOUNT OF [__]% SENIOR NOTES DUE 2007 OF NEWCO (THE "SENIOR
NOTES") AND A WARRANT,  AND EACH SENIOR  DISCOUNT NOTE UNIT OF WHICH CONSISTS OF
$[_____]  PRINCIPAL  AMOUNT  AT  MATURITY  OF  SENIOR  DISCOUNT  NOTES  DUE 2007
(TOGETHER WITH THE SENIOR NOTES, THE "NOTES") AND A WARRANT.  PRIOR TO THE CLOSE
OF  BUSINESS  UPON THE  EARLIEST  OF (I) THE DATE THAT IS SIX  MONTHS  AFTER THE
CLOSING DATE, (II) SUCH DATE AS THE UNDERWRITERS MAY, IN THEIR DISCRETION,  DEEM
APPROPRIATE  AND (III) THE DATE NEWCO MAILS NOTICE OF AN OFFER TO REPURCHASE THE
NOTES TO HOLDERS OF THE NOTES PURSUANT TO THE INDENTURES, THE WARRANTS EVIDENCED
BY THIS CERTIFICATE MAY NOT BE TRANSFERRED OR EXCHANGED SEPARATELY FROM, BUT MAY
BE TRANSFERRED OR EXCHANGED ONLY TOGETHER WITH, THE NOTES.]*

[UNLESS THIS WARRANT CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
THE DEPOSITORY  TRUST COMPANY TO NEWCO OR THE WARRANT AGENT FOR  REGISTRATION OF
TRANSFER, EXCHANGE OR REPURCHASE AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE
NAME OF  CEDE & CO.  OR SUCH  OTHER  ENTITY  AS IS  REQUESTED  BY AN  AUTHORIZED
REPRESENTATIVE  OF THE DEPOSITORY  TRUST COMPANY (AND ANY PAYMENT HEREON IS MADE
TO  CEDE  & CO.  OR TO  SUCH  OTHER  ENTITY  AS IS  REQUESTED  BY AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY),  ANY TRANSFER,  PLEDGE OR OTHER
USE HEREOF FOR VALUE OR  OTHERWISE  BY OR TO ANY  PERSON IS  WRONGFUL  SINCE THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

TRANSFERS OF THIS GLOBAL  SECURITY  SHALL BE LIMITED TO TRANSFERS IN WHOLE,  BUT
NOT IN PART,  TO  NOMINEES  OF THE  DEPOSITORY  TRUST  COMPANY OR TO A SUCCESSOR
THEREOF OR SUCH  SUCCESSOR'S  NOMINEE AND  TRANSFERS  OF PORTIONS OF THIS GLOBAL
SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE  RESTRICTIONS
SET FORTH IN ARTICLE II OF THE WARRANT AGREEMENT.]**














- -----------------------------
*        To be included on Warrants issued prior to the Separation Date.
**       To be included on any Global Warrant.


<PAGE>
                                      A-2


                           ORION NEWCO SERVICES, INC.


No. _____                                                    CUSIP No. [_______]

                       WARRANTS TO PURCHASE COMMON SHARES

                  This certifies that _____________,  or its registered assigns,
is the owner of the number of Warrants set forth above, each of which represents
the right to purchase,  after [_____], 1997, from ORION NEWCO SERVICES,  INC., a
Delaware  corporation  ("Newco"),  one share of common stock, par value $.01 per
share (collectively,  the "Common Shares"),  of Newco at the purchase price (the
"Exercise  Price") of $[___] per Common Share (subject to adjustment as provided
in the Warrant Agreement  hereinafter referred to), upon surrender hereof at the
office of Bankers  Trust  Company or to its successor as the warrant agent under
the Warrant  Agreement  hereinafter  referred to (any such  warrant  agent being
herein called the "Warrant  Agent"),  with the Subscription  Form on the reverse
hereof  duly  executed,  with  signature  guaranteed  as therein  specified  and
simultaneous  payment in full (by cash or by certified or official  bank or bank
cashier's  check payable to the order of Newco,  or by the surrender of Warrants
having an aggregate  Spread (as defined in the Warrant  Agreement)  equal to the
Exercise  Price of the Warrants  being  exercised) of the purchase price for the
share(s) as to which the Warrant(s)  represented by this Warrant Certificate are
exercised,  all  subject to the terms and  conditions  hereof and of the Warrant
Agreement.  Notwithstanding  the  foregoing,  Newco  shall have the right to not
allow an exercise of any Warrants in the event the Registration Statement is not
effective and available at the time Warrants are exercised,  unless prior to the
exercise of such Warrants, the Holder thereof furnishes to the Warrant Agent and
Newco such certifications, legal opinions or other information as either of them
may  reasonably  require to confirm that such exercise is being made pursuant to
an exemption from the registration requirements of the Securities Act.

                  This Warrant  Certificate  is issued  under and in  accordance
with a Warrant Agreement dated as of [_______],  1997 (the "Warrant Agreement"),
between Newco and Bankers Trust Company, as Warrant Agent, and is subject to the
terms and provisions contained therein, to all of which terms and provisions the
Holder of this Warrant  Certificate  consents by acceptance  hereof. The Warrant
Agreement is hereby  incorporated  herein by  reference  and made a part hereof.
Reference is hereby made to the Warrant  Agreement for a full description of the
rights, limitations of rights, obligations,  duties and immunities thereunder of
Newco and the Holders of the  Warrants.  The summary of the terms of the Warrant
Agreement  contained in this Warrant Certificate is qualified in its entirety by
express  reference  to the  Warrant  Agreement.  All terms used in this  Warrant
Certificate  that are defined in the Warrant  Agreement  shall have the meanings
assigned to them in the Warrant Agreement.

<PAGE>
                                      A-3

                  Copies of the Warrant  Agreement  are on file at the office of
the Warrant  Agent and may be  obtained  by writing to the Warrant  Agent at the
following address:

                  Bankers Trust Company
                  4 Albany Street
                  New York, New York 10006
                  Attention:  Corporate Trust and Agency Group

                  A  "Repurchase  Event",  as defined in the Warrant  Agreement,
shall be deemed to occur on any date  prior to  [________],  2007 when Newco (i)
consolidates  or merges into or with another  Person (but only where the holders
of Common  Shares  receive  consideration  in  exchange  for all or part of such
Common Shares) if the Common Shares (or other  securities)  thereafter  issuable
upon exercise of the Warrants are not registered  under the Exchange Act or (ii)
sells all or  substantially  all of its assets to  another  Person if the Common
Shares (or other securities)  thereafter  issuable upon exercise of the Warrants
is not  registered  under  the  Exchange  Act;  provided  that  in  each  case a
"Repurchase  Event" will not be deemed to have occurred if the consideration for
the Common Shares in such transaction consists solely of cash.

             Following  a  Repurchase  Event,   Newco  must  make  an  offer  to
repurchase all  outstanding  Warrants (a "Repurchase  Offer").  If Newco makes a
Repurchase  Offer,  Holders  may,  until  the  expiration  date of  such  offer,
surrender all or part of their Warrants for repurchase by Newco.

                  Warrants received by the Warrant Agent in proper form during a
Repurchase Offer will, except as otherwise provided in the Warrant Agreement, be
repurchased  by Newco at a price in cash (the  "Repurchase  Price") equal to the
value on the  Valuation  Date  relating  thereto of the Common  Shares and other
securities  or property  which would have been  delivered  upon  exercise of the
Warrants had the Warrants been  exercised,  less the Exercise  Price (whether or
not the  Warrants  are then  exercisable).  The value of such Common  Shares and
other  securities  will be (i) if the Common  Shares (or other  securities)  are
registered  under the  Exchange  Act,  determined  based upon the average of the
closing  sales  prices of the  Common  Shares (or other  securities)  for the 20
consecutive  trading days  immediately  preceding such Valuation Date or, if the
Common Shares (or other  securities) have been registered under the Exchange Act
for less than 20 consecutive  trading days before such date, then the average of
the closing  sales prices for all of the trading days before such date for which
closing  sales  prices  are  available  or (ii) if the  Common  Shares (or other
securities) are not registered  under the Exchange Act or if the value cannot be
computed under clause (i) above,  determined by the Independent Financial Expert
(as defined in the Warrant Agreement),  in each case as set forth in the Warrant
Agreement.

                  The "Valuation Date" with respect to a Repurchase Offer is the
date five  Business  Days prior to the date notice of such  Repurchase  Offer is
first given.

<PAGE>
   
                                   A-4
                  If  Newco  fails to make or  complete  a  Repurchase  Offer (a
"Default")  as required  by the  Warrant  Agreement,  it shall be  obligated  to
increase  the amount  otherwise  payable  pursuant to the Warrant  Agreement  in
respect of the Repurchase Offer by an amount equal to interest thereon at a rate
per annum of [__]% from the date of the  Default to the date of  payment,  which
interest shall compound quarterly.

                  If Newco merges or consolidates  with or into, or sells all or
substantially all of its property and assets to, another Person solely for cash,
or in the event of the  dissolution,  liquidation  or winding-up  of Newco,  the
Holders of Warrants  shall be entitled to receive  distributions  on the date of
such event on an equal basis with holders of Common Shares (or other  securities
issuable upon  exercise of the  Warrants) as if the Warrants had been  exercised
immediately  prior to such event (less the Exercise Price) or the amount payable
pursuant  to an  outstanding  Repurchase  Offer  if a  Repurchase  Offer is then
outstanding or required, if higher.

                  The number of Common Shares  purchasable  upon the exercise of
each  Warrant and the price per share are subject to  adjustment  as provided in
the Warrant Agreement.  Except as stated in the immediately preceding paragraph,
in the event Newco merges or  consolidates  with, or sells all or  substantially
all of its assets to, another Person, each Warrant will, upon exercise,  entitle
the Holder  thereof to  receive  the number of shares of capital  stock or other
securities  or the  amount  of money and other  property  which the  holder of a
Common  Share (or other  securities  or  property  issuable  upon  exercise of a
Warrant) is entitled to receive upon completion of such merger, consolidation or
sale.

                  As to any final  fraction  of a share which the same Holder of
one or more  Warrants  would  otherwise  be entitled to purchase  upon  exercise
thereof  in the  same  transaction,  Newco  shall  pay the  cash  value  thereof
determined as provided in the Warrant Agreement.

                  All Common Shares or other  securities  issuable by Newco upon
the exercise of Warrants shall be validly issued,  fully paid and not subject to
any  calls for  funds,  and  Newco  shall  pay all taxes and other  governmental
charges  that may be imposed  under the laws of the United  States of America or
any political  subdivision or taxing authority  thereof or therein in respect of
the issue or  delivery of such shares or of other  securities  deliverable  upon
exercise of Warrants.  Newco shall not be required,  however,  to pay any tax or
other charge  imposed in connection  with any transfer  involved in the issue of
any certificate for Common Shares,  and in such case Newco shall not be required
to issue or deliver  any stock  certificate  until such tax or other  charge has
been  paid  or it has  been  established  to the  Warrant  Agent's  and  Newco's
satisfaction that no tax or other charge is due.

                  This  Warrant   Certificate  and  all  rights   hereunder  are
transferable  by the  registered  Holder  hereof,  in whole  or in part,  on the
register of Newco maintained by the Warrant Agent for such purpose at its office
in New York, New York, upon surrender of this Warrant Certificate duly endorsed,
or accompanied by a written instrument of transfer in form 

<PAGE>
                                    A-5

satisfactory  to Newco and the  Warrant  Agent duly  executed,  with  signatures
guaranteed as specified in the attached Form of  Assignment,  by the  registered
Holder hereof or his attorney duly authorized in writing and upon payment of any
necessary transfer tax or other governmental  charge imposed upon such transfer.
Upon any partial  transfer,  Newco will issue and the Warrant Agent will deliver
to such Holder a new Warrant  Certificate  or  Certificates  with respect to any
portion not so transferred.  Each taker and Holder of this Warrant  Certificate,
by  taking  and  holding  the  same,  consents  and  agrees  that  prior  to the
registration  of transfer as  provided in the Warrant  Agreement,  Newco and the
Warrant Agent may treat the person in whose name the Warrants are  registered as
the absolute owner hereof for any purpose and as the Person entitled to exercise
the rights represented hereby, any notice to the contrary notwithstanding.

                  This Warrant Certificate may be exchanged at the office of the
Warrant  Agent  maintained  for such  purpose in New York,  New York for Warrant
Certificates  representing  the same  aggregate  number  of  Warrants,  each new
Warrant  Certificate  to represent  such number of Warrants as the Holder hereof
shall designate at the time of such exchange.

                  Prior to the exercise of the Warrants  represented hereby, the
Holder of this Warrant Certificate, as such, shall not be entitled to any rights
of a stockholder of Newco, including,  without limitation,  the right to vote or
to consent  to any action of the  stockholders,  to receive  dividends  or other
distributions,  to  exercise  any  preemptive  right or to receive any notice of
meetings of stockholders, and shall not be entitled to receive any notice of any
proceedings of Newco except as provided in the Warrant Agreement.

                  This  Warrant   Certificate  shall  be  void  and  all  rights
evidenced hereby shall cease on [________],  2007,  unless sooner  terminated by
the liquidation,  dissolution or winding-up of Newco or as otherwise provided in
the Warrant Agreement upon the consolidation or merger of Newco with, or sale of
Newco to,  another  Person or unless  such date is  extended  as provided in the
Warrant Agreement.




<PAGE>
                                      A-6


                  This  Warrant  Certificate  shall not be valid for any purpose
until it shall have been countersigned by the Warrant Agent.


Dated:


                                                      ORION NEWCO SERVICES, INC.




                                                      By: 
                                                          ----------------------
                                                          Name:
                                                          Title:



Countersigned:

BANKERS TRUST COMPANY,
   as Warrant Agent


By:  
      ---------------------
      Authorized Signatory


<PAGE>

                                      A-7

                     FORM OF REVERSE OF WARRANT CERTIFICATE

                                SUBSCRIPTION FORM
(To be executed only upon exercise of Warrant) To:

                  The undersigned irrevocably exercises ________ of the Warrants
represented by the Warrant  Certificate for the purchase of [_____]  (subject to
adjustment)  Common Shares,  par value $.01 per share,  of ORION NEWCO SERVICES,
INC. and herewith  makes  payment of $_______  (such payment being by cash or by
certified or official  bank or bank  cashier's  check payable to the order or at
the  direction of Newco,  or by the  surrender  of Warrants  having an aggregate
Spread (as defined in the Warrant  Agreement) equal to the Exercise Price of the
Warrants  being  exercised),  all at the  exercise  price  and on the  terms and
conditions specified in the within Warrant Certificate and the Warrant Agreement
therein referred to,  surrenders this Warrant  Certificate and all right,  title
and interest therein to and directs that the Common Shares  deliverable upon the
exercise of such Warrants be registered or placed in the name and at the address
specified below and delivered thereto.

Dated:                                      
                                            ------------------------------------
                                            (Signature of Owner)

                                            ------------------------------------
                                            (Street Address)

                                            ------------------------------------
                                            (City)          (State)   (Zip Code)


                                            Signature Guaranteed By:1


                                            ------------------------------------

- ----------
1    The Holder's  signature must be guaranteed by a member firm of a registered
     national securities  exchange or of the National  Association of Securities
     Dealers,  Inc.,  a  commercial  bank or trust  company  having an office or
     correspondent in the United States or an "eligible  guarantor  institution"
     as defined by Rule 17Ad-15 under the Exchange Act.  Securities and/or check
     to be issued to: Please insert social security or identifying number: Name:

<PAGE>
                                      A-8

Securities and/or check to be issued to:
Please insert social security or identifying number:
Name:
Street Address:
City, State and Zip Code:






<PAGE>


             FORM OF CERTIFICATE FOR SURRENDER FOR REPURCHASE OFFER

                      (To be executed only upon repurchase
                              of Warrant by Newco)

To:

                  The   undersigned,   having   received  prior  notice  of  the
consideration for which ORION NEWCO SERVICES,  INC. will repurchase the Warrants
represented by the within Warrant  Certificate,  hereby  surrenders this Warrant
Certificate  for  repurchase  by ORION  NEWCO  SERVICES,  INC.  of the number of
Warrants specified below for the consideration set forth in such notice.

Dated:
                                     -----------------------------------
                                     (Number of Warrants
                                        to be Repurchased)


                                     -----------------------------------
                                     (Signature of Owner)


                                     -----------------------------------
                                     (Street Address)


                                     -----------------------------------
                                     (City)     (State)       (Zip Code)


                                     Signature Guaranteed By:1


                                     -----------------------------------

- ----------
1    The Holder's  signature must be guaranteed by a member firm of a registered
     national securities  exchange or of the National  Association of Securities
     Dealers,  Inc.,  a  commercial  bank or trust  company  having an office or
     correspondent in the United States or an "eligible  guarantor  institution"
     as defined by Rule 17Ad-15 under the Exchange Act.  Securities and/or check
     to be issued to: Please insert social security or identifying number: Name:

<PAGE>
                                      A-10

Securities and/or check to be issued to:
Please insert social security or identifying number:
Name:
Street Address:
City, State and Zip Code:




<PAGE>

                               FORM OF ASSIGNMENT

                  FOR VALUE RECEIVED the  undersigned  registered  holder of the
within  Warrant  Certificate  hereby  sells,  assigns,  and  transfers  unto the
Assignee(s)  named below (including the undersigned with respect to any Warrants
constituting a part of the Warrants evidenced by the within Warrant  Certificate
not being assigned hereby) all of the right of the undersigned  under the within
Warrant Certificate, with respect to the number of Warrants set forth below:

Name(s) of Assignee(s):  _____________________________________

Address:  __________________________________________________

No. of Warrants:  ___________________________________________

Please insert social security or other identifying number of assignee(s):

and does hereby irrevocably constitute and appoint  ________________________ the
undersigned's  attorney to make such transfer on the books of __________________
maintained for the purposes, with full power of substitution in the premises.

Dated:                              
                                     -------------------------------------
                                     (Signature of Owner)


                                     -------------------------------------
                                     (Street Address)


                                     -------------------------------------
                                     (City)     (State)       (Zip Code)

                                     Signature Guaranteed By:*


                                     -------------------------------------

- ----------
1    The Holder's  signature must be guaranteed by a member firm of a registered
     national securities  exchange or of the National  Association of Securities
     Dealers,  Inc.,  a  commercial  bank or trust  company  having an office or
     correspondent in the United States or an "eligible  guarantor  institution"
     as defined by Rule 17Ad-15 under the Exchange Act.  Securities and/or check
     to be issued to: Please insert social security or identifying number: Name:


<PAGE>






                                   APPENDIX A


LIST OF FINANCIAL EXPERTS
- -------------------------

[Alex. Brown & Sons
Bear, Stearns & Co., Inc.
Dillon, Read & Co. Inc.
Donaldson, Lufkin & Jenrette Securities Corporation
Goldman, Sachs & Co.
Lazard Freres & Co.
Merrill Lynch, Pierce, Fenner & Smith Incorporated
Morgan Stanley & Co. Incorporated
PaineWebber Incorporated
Prudential Securities Inc.
Salomon Brothers Inc
Lehman Brothers]


<PAGE>



- --------
11    The Holder's signature must be guaranteed by a member firm of a registered
      national securities exchange or of the National  Association of Securities
      Dealers,  Inc., a  commercial  bank or trust  company  having an office or
      correspondent in the United States or an "eligible guarantor  institution"
      as defined by Rule 17Ad-15 under the Exchange Act.

11    The Holder's signature must be guaranteed by a member firm of a registered
      national securities exchange or of the National  Association of Securities
      Dealers,  Inc., a  commercial  bank or trust  company  having an office or
      correspondent in the United States or an "eligible guarantor  institution"
      as defined by Rule 17Ad-15 under the Exchange Act.

*     The Holder's signature must be guaranteed by a member firm of a registered
      national securities exchange or of the National  Association of Securities
      Dealers,  Inc., a  commercial  bank or trust  company  having an office or
      correspondent in the United States or an "eligible guarantor  institution"
      as defined by Rule 17Ad-15 under the Exchange Act.



<TABLE>
<CAPTION>

Exhibit 12.1-Statement Re:  Computation of Ratio of Earnings to Fixed Charges

                                                            Year Ended December 31,
                         -------------------------------------------------------------------------------------------------
                              1991           1992           1993           1994            1995           1995 Pro Forma
                         -------------------------------------------------------------------------------------------------
EARNINGS
<S>                      <C>            <C>           <C>            <C>              <C>                <C>           
Net loss                 $(2,573,226)   $(3,294,863)   $ (7,886,071)   $ (7,964,918)    $(26,915,178)      $(103,156,070)
Interest                     455,987      5,636,736      16,280,888      27,291,040       26,049,216          52,893,581
Interest capitalized
  during the period               --     (5,457,139)    (16,148,019)    (27,230,481)      (1,310,770)         (2,256,781)
Interest portion of
  rental Expense              79,774        108,720         838,644       1,037,149        1,326,206           1,326,206
                         -------------------------------------------------------------------------------------------------
                         $(2,037,465)   $(3,006,546)   $ (6,914,558)   $ (6,867,210)    $   (850,526)      $ (51,193,064)
                         =================================================================================================

FIXED CHARGES            $   455,987    $ 5,636,736    $ 16,280,888    $ 27,291,040     $ 26,049,216       $  52,893,581
Interest
Interest portion of
  rental expense              79,774        108,720         838,644       1,037,149        1,326,206           1,326,206
                         -------------------------------------------------------------------------------------------------
                         $   535,761    $ 5,745,456    $ 17,119,532    $ 28,328,189     $ 27,375,422       $  54,219,787
                         =================================================================================================

DEFICIENCY               $(2,573,226)   $(8,752,002)   $(24,034,090)   $(35,195,399)    $(28,225,948)      $(105,412,851)
                         =================================================================================================
</TABLE>

                                     Nine months ended September 30,     
                         -------------------------------------------------------
                              1995             1996           1996 Pro Forma  
                         -------------------------------------------------------
EARNINGS                 $(19,985,085)    $(19,807,287)       $(67,262,637)
Net loss          
Interest                   18,390,916       20,228,519          42,763,127      
Interest capitalized
  during the period        (1,310,770)              --          (3,241,875)
Interest portion of
  rental Expense              993,099          962,637             962,637  
                         -------------------------------------------------------
                         $ (1,911,840)    $  1,383,869        $(26,778,748)
                         =======================================================

FIXED CHARGES            
Interest                 $ 18,390,916     $ 20,228,519        $ 42,763,127
Interest portion of
  rental expense              993,099          962,637             962,637 
                         -------------------------------------------------------
                         $ 19,384,015     $ 21,191,156        $ 43,725,764
                         =======================================================
                  
DEFICIENCY               $(21,295,855)    $(19,807,287)       $(70,504,512)     
                         =======================================================


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