ORION NETWORK SYSTEMS INC/DE/
8-K, 1996-12-20
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K
                                 CURRENT REPORT
                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



Date of Report (Date of earliest event reported):        Commission File Number:
                   December 13, 1996                             0-26450



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



                 Delaware                                52-1271418
       (State or other jurisdiction                     (IRS Employer
             of incorporation)                     Identification Number)



                             2440 Research Boulevard
                                    Suite 400
                            Rockville, Maryland 20850
              (Address of principal executive offices) (Zip Code)


               Registrant's telephone number, including area code:
                                 (301) 258-8101


          (Former name or former address, if changed since last report)

                                 Not applicable



<PAGE>



                           ORION NETWORK SYSTEMS, INC.

Item 5  - Other Events

                  Orion Network  Systems,  Inc.  ("Orion") has agreed to acquire
all of the  interests  which  it does  not  already  own in the  Orion  Atlantic
partnership. Orion currently owns 41.7% of Orion Atlantic, a limited partnership
formed in 1991 to construct,  launch and operate communications  satellites over
the Atlantic  Ocean.  The partners  whose  interests  are being  acquired by the
Company  are  British   Aerospace   Communications,   Inc.,  COM  DEV  Satellite
Communications Limited, Kingston Communications  International Limited, Lockheed
Martin Commercial Launch Services, Inc., MCN Sat US, Inc. (an affiliate of Matra
Hachette),  and Trans  Atlantic  Satellite,  Inc.  (an  affiliate of Nissho Iwai
Corp.).  A copy of the Section 351  Exchange  Agreement  and Plan of  Conversion
(together with certain exhibits thereto) is attached as Exhibit B to this report
on Form 8-K, and is incorporated by reference herein.

                  Under the agreement  Orion is to exchange  approximately  $122
million  of a  new  class  of  convertible  preferred  stock  for  the  acquired
interests.  The preferred stock will be convertible  into common stock at $17.50
per  share,   representing   approximately  seven  million  common  shares.  The
acquisition,  which is expected to be completed in the first quarter of 1997, is
subject to  stockholder  approval  and the  refinancing  of  approximately  $210
million of existing Orion Atlantic bank debt.

                  In connection  with the  acquisition,  British  Aerospace will
invest   approximately   $50  million  in   convertible   securities  of  Orion,
representing approximately 3.5 million common shares.

                  As part of the exchange, Orion will form a new holding company
substantially  identical  to  Orion  and  merge  into a  subsidiary  of that new
company.  As a result,  the holding  company will become  publicly traded on the
Nasdaq  National  Market  System,  Orion will become a subsidiary of the holding
company  and all of the  stockholders  of Orion  will  receive  stock in the new
company with  substantially  identical  rights to the Orion stock they presently
hold.


                                      -2-

<PAGE>



                                    SIGNATURE

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.



                                                     ORION NETWORK SYSTEMS, INC.


Date:  December 19, 1996                             By:/S/W. Neil Bauer
                                                        ------------------------
                                                        W. Neil Bauer
                                                        President and CEO


                                      -3-


<PAGE>


                                  EXHIBIT INDEX
                                  -------------


Exhibit                             Description                             Page
- -------                             -----------                             ----

 10       Section 351 Exchange  Agreement  and Plan of  Conversion  (the
          "Exchange  Agreement"),  dated  as  of  June  __,  1996  among
          International Private Satellite Partners,  L.P., Orion Network
          Systems, Inc., Orion Satellite Corporation,  British Aerospace
          Communications,   Inc.,   COM  DEV  Satellite   Communications
          Limited,   Kingston   Communications   International  Limited,
          Lockheed Martin Commercial Launch Services,  Inc., MCN Sat US,
          Inc., and Trans Atlantic Satellite, Inc., and certain exhibits
          thereto

 99       Press Release dated December 16, 1996












              SECTION 351 EXCHANGE AGREEMENT AND PLAN OF CONVERSION

                                      AMONG

                 INTERNATIONAL PRIVATE SATELLITE PARTNERS, L.P.

                          ORION NETWORK SYSTEMS, INC.,

                          ORION SATELLITE CORPORATION,

                     BRITISH AEROSPACE COMMUNICATIONS, INC.

                    COM DEV SATELLITE COMMUNICATIONS LIMITED

                  KINGSTON COMMUNICATIONS INTERNATIONAL LIMITED

                LOCKHEED MARTIN COMMERCIAL LAUNCH SERVICES, INC.

                                MCN SAT US, INC.

                                       and

                         TRANS-ATLANTIC SATELLITE, INC.






                                   Dated as of

                                 June ___, 1996


<PAGE>


                                TABLE OF CONTENTS
                                -----------------
                                                                          Page
                                                                          ----

1.    DEFINITIONS..........................................................2

2.    NEWCO FORMATION......................................................2
      2.1.  Formation of New Corporation...................................2
      2.2.  Initial Ownership of Newco.....................................2
      2.3.  Replication of ONS Management..................................3
      2.4.  Newco Formation Documents......................................3

3.    EXCHANGE OF INTERESTS................................................3
      3.1.  Newco Preferred Stock..........................................3
      3.2.  Terms of Exchange..............................................4
      3.3.  Allocation of Newco Preferred Stock............................8

4.    MERGER...............................................................8
      4.1.  Formation of Subsidiary of Newco...............................8
      4.2.  Terms of Merger................................................8
      4.3.  Transfer of Certain Contracts..................................9
      4.4.  Merger Documents...............................................9

5.    ADDITIONAL UNDERTAKINGS AND COVENANTS................................9
      5.1.  Consents and Approvals.........................................9
      5.2.  Approval by Stockholders of ONS................................10
      5.3.  Refinancing of Credit Facility; Cancellation of Capacity
               Agreements..................................................11
      5.4.  Amendment and Restatement of Partnership Agreement.............12
      5.5.  Registration Rights............................................12
      5.6.  Access; Investigations by the Exchanging Partners..............13
      5.7.  Waiver of Right of First Refusal under the Partnership
               Agreement...................................................13
      5.8.  Convertible Subordinated Debentures............................14
      5.9.  Agreement Regarding Transfer...................................14
      5.10. Release of Claims..............................................14
      5.11. Legend, Removal................................................15
      5.12. Tax-Free Status................................................15

6.    REPRESENTATIONS AND WARRANTIES OF EXCHANGING
      PARTNERS.............................................................15
      6.1.  Title to LP Interests; Other LP Rights.........................16
      6.2.  Organization and Standing; Capacity............................16
      6.3.  Authorization..................................................16
      6.4.  Restrictions and Consents......................................17
      6.5.  Binding Obligation.............................................17

                                      - i-
<PAGE>

      6.6.  Transfer of Title..............................................17
      6.7.  Accredited Investors...........................................17
      6.8.  Name Change of Lockheed Martin.................................17

7.    REPRESENTATIONS AND WARRANTIES OF ONS................................17
      7.1.  Organization and Standing......................................18
      7.2.  Authorization..................................................18
      7.3.  Restrictions and Consents......................................18
      7.4.  Binding Obligation.............................................18
      7.5.  Issuance of Shares.............................................19
      7.6.  Capitalization.................................................19
      7.7.  No Liabilities.................................................20
      7.8.  Taxes..........................................................20
      7.9.  Subsidiaries...................................................20
      7.10. Books and Records..............................................21
      7.11. Litigation.....................................................21
      7.12. SEC Filings....................................................21
      7.13. Transactions with Exchanging Partners..........................22
      7.14. Absence of Violations..........................................22

8.    RESTRICTED SECURITIES................................................22
      8.1.  No Registration Under the Securities Act.......................22
      8.2.  Acquisition for Investment.....................................22
      8.3.  Evaluation of Merits and Risks of Investment...................23
      8.4.  Review of Documents............................................23
      8.5.  Opportunity to Request Information.............................23

9.    CONDITIONS PRECEDENT TO OBLIGATIONS OF THE EXCHANGING
      PARTNERS.............................................................24
      9.1.  Representations and Warranties.................................24
      9.2.  Performance....................................................24
      9.3.  Documents at Closing...........................................24
      9.4.  Refinancing of Credit Facility, Cancellation of Capacity
               Agreements..................................................24
      9.5.  Consents.......................................................25
      9.6.  Registration...................................................25
      9.7.  Satellite Contract.............................................25
      9.8.  Launch Sub Contract............................................25
      9.9.  Newco Formation................................................25
      9.10. Merger.........................................................26
      9.11. Tax Opinion....................................................26

10.   CONDITIONS PRECEDENT TO OBLIGATIONS OF ONS AND
      ORIONSAT.............................................................26
      10.1. Representations and Warranties.................................26

                                     - ii -

<PAGE>

      10.2.  Performance...................................................26
      10.3.  Documents at Closing..........................................26
      10.4.  Consents......................................................27
      10.5.  Refinancing of Credit Facility, Cancellation of Capacity
               Agreements..................................................27
      10.6.  Partnership Agreement Amendment...............................27
      10.7.  Consents of the ONS Stockholders..............................27
      10.8.  Completion of Financing for a Second Satellite................27
      10.9.  Satellite Contract............................................27
      10.10. Newco Formation...............................................27
      10.11. Merger........................................................28

11.   CLOSING..............................................................28
      11.1.  Closings......................................................28
      11.2.  Deliveries by the Exchanging Partners.........................28
      11.3.  Deliveries by ONS and Newco...................................29
      11.4.  Order of Effectiveness........................................30

12.   SURVIVAL OF REPRESENTATIONS; INDEMNIFICATION;
      REMEDIES.............................................................30
      12.1.  Survival of Representations...................................30
      12.2.  Agreement of Newco, ONS and OrionSat to Indemnify.............30
      12.3.  Conditions of Indemnification.................................31
      12.4.  Specific Performance; No Consequential Damages................32

13.   TERMINATION..........................................................32
      13.1.  Termination...................................................32
      13.2.  Effect of Termination.........................................33

14.   MISCELLANEOUS........................................................33
      14.1.  Additional Actions and Documents..............................33
      14.2.  Broker's Fees or Liabilities..................................34
      14.3.  Expenses......................................................34
      14.4.  Assignment....................................................34
      14.5.  Entire Agreement; Amendment...................................34
      14.6.  Waiver........................................................34
      14.7.  Consent to Jurisdiction.......................................35
      14.8.  Severability..................................................35
      14.9.  Governing Law.................................................35
      14.10. Notices.......................................................35
      14.11. Headings......................................................37
      14.12. Execution in Counterparts.....................................37
      14.13. Limitation on Benefits........................................38
      14.14. Binding Effect................................................38

                                     - iii-


<PAGE>





EXHIBITS:

Exhibit A                  Definitions
Exhibit B                  Certificate of Designations
Exhibit C                  Third Amended and Restated Partnership Agreement
Exhibit D                  Registration Rights Agreement
Exhibit E                  Agreement Regarding Transfer Restrictions
Exhibit F                  Assignment of LP Interests
Exhibit G                  Assignment of Other LP Rights
Exhibit H                  Termination of Guarantees
Exhibit I                  Legal Opinion of ONS and Newco Counsel
Exhibit J                  Escrow Agreement
Exhibit K                  Communications Memorandum



SCHEDULES:

Schedule 7.3               Restrictions and Consents
- ------------
Schedule 7.9               List of Subsidiaries of ONS
- ------------
Schedule 7.11              Skydata Litigation
- -------------

                                     - iv -

<PAGE>


              SECTION 351 EXCHANGE AGREEMENT AND PLAN OF CONVERSION


                  THIS SECTION 351  EXCHANGE  AGREEMENT  AND PLAN OF  CONVERSION
(this  "Agreement")  is entered  into as of June ___,  1996,  between  and among
International  Private Satellite Partners,  L.P., a Delaware limited partnership
("Orion Atlantic"); Orion Network Systems, Inc., a Delaware corporation ("ONS");
Orion Satellite Corporation,  a Delaware corporation  ("OrionSat");  and each of
the following  entities that executes and delivers a signature page hereto on or
before  July 12,  1996:  British  Aerospace  Communications,  Inc.,  a  Delaware
corporation  ("BAe"),  COM DEV  Satellite  Communications  Limited,  a  Canadian
corporation  ("COM  DEV"),  Kingston  Communications  International  Limited,  a
company  incorporated  under the laws of England  ("Kingston"),  Lockheed Martin
Commercial Launch Services,  Inc., a Delaware  corporation  ("Lockheed Martin"),
MCN Sat US,  Inc.,  a  Delaware  corporation  ("MCN  Sat"),  and Trans  Atlantic
Satellite,   Inc.,  a  Delaware  corporation  ("TA  Sat")   (collectively,   the
"Exchanging Partners").

                  WHEREAS,  ONS and the Exchanging Partners  (collectively,  the
"Limited  Partners")  collectively  own limited  partnership  interests in Orion
Atlantic;

                  WHEREAS,  OrionSat  is  the  sole  general  partner  of  Orion
Atlantic;

                  WHEREAS,  ONS and the Exchanging Partners desire to (i) form a
new  Delaware  corporation  to be named Orion  Newco  Services,  Inc.  ("Newco")
substantially  identical in all  material  respects  (including  with respect to
certificate of incorporation, bylaws, capital structure, and similar matters) to
ONS in the  Newco  Formation  (as  defined  below);  (ii)  have a newly  created
subsidiary of Newco merge into ONS in a  transaction  in which all capital stock
of ONS is exchanged  for  equivalent  capital  stock  (common or  preferred,  as
applicable,  with the same relative  rights and  preferences)  of Newco,  and in
which ONS becomes a wholly owned  subsidiary  of Newco in the Merger (as defined
below);   and  (iii)  have  the  Exchanging   Partners  transfer  their  limited
partnership  interests  in Orion  Atlantic to Newco in exchange  for shares of a
newly created class of Series C 6% Cumulative  Convertible  Redeemable Preferred
Stock of Newco (the "Newco  Preferred  Stock") on the terms and  conditions  set
forth herein in the Exchange (as defined below),  all pursuant to Section 351 of
the Internal Revenue Code of 1986, as amended (the "Code"); and

                  WHEREAS, in connection with the transactions  described in the
prior paragraph, the Credit Facility Refinancing,  Bond Offering, Bank Agreement
Termination,   Capacity  Agreement  Termination  and  Convertible   Subordinated
Debenture  Offering  (as  defined  below)  will  be  pursued.  The  transactions
contemplated  by this  Agreement are believed to be necessary to accomplish  the
Credit Facility Refinancing, Bond Offering, Bank Agreement Termination, Capacity
Agreement Termination and Convertible  Subordinated  Debenture Offering, and all

<PAGE>

parties  hereto,   including  the  Exchanging   Partners,   which  will  be  the
stockholders of Newco immediately after completion of the Exchange, believe that
they will  benefit  substantially  from the Credit  Facility  Refinancing,  Bond
Offering,  Bank  Agreement  Termination,   Capacity  Agreement  Termination  and
Convertible Subordinated Debenture Offering.

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


1.                DEFINITIONS

                  For all purposes of this Agreement,  certain capitalized terms
specified  in Exhibit A shall  have the  meanings  set forth in that  Exhibit A,
except as otherwise expressly provided.


2.                NEWCO FORMATION


                  2.1.      FORMATION OF NEW CORPORATION

                  The parties hereto shall form a new Delaware corporation to be
named  Orion  Newco  Services,  Inc.  which is  substantially  identical  in all
material  respects to ONS (the "Newco  Formation").  In particular,  Newco shall
have a certificate of incorporation  and bylaws  substantially  identical in all
material  respects to those of ONS (modified to reflect the  different  name and
Newco  being  a  newly  formed  corporation).  Pursuant  to the  certificate  of
incorporation  of Newco,  the board of  directors  of Newco  shall  duly  adopt,
authorize, execute and file Certificates of Designations, Rights and Preferences
of  Series  A 8%  Cumulative  Redeemable  Convertible  Preferred  Stock of Newco
substantially  identical in all material  respects to the ONS Series A Preferred
Stock (as defined  below) and of Series B 8% Cumulative  Redeemable  Convertible
Preferred Stock of Newco substantially identical in all material respects to the
ONS Series B Preferred Stock (as defined below).


                  2.2.      INITIAL OWNERSHIP OF NEWCO

                  ONS shall be the initial  stockholder of Newco,  and shall own
one share of Newco common stock.

                                       2

<PAGE>


                  2.3.      REPLICATION OF ONS MANAGEMENT

                  ONS shall take the steps  necessary to make the  management of
Newco  identical to the  management of ONS,  including with respect to directors
and officers.


                  2.4.     NEWCO FORMATION DOCUMENTS

                  ONS shall cause all necessary  documents (the "Newco Formation
Documents")  to effect the Newco  Formation  and other  matters  referred  to in
Sections  2.1,  2.2 and 2.3 to be  prepared  and  circulated  to the  Exchanging
Partners for review and comment.  The  Exchanging  Partners  agree to submit any
comments on the Newco Formation Documents,  consistent with the requirement that
Newco be  substantially  identical  in all material  respects to ONS,  within 10
Business Days after all Exchanging  Partners have received the initial drafts of
such documents and within five Business Days after receipt of subsequent drafts.
ONS shall cause final  drafts of the Newco  Formation  Documents to be prepared,
consistent with the  requirement  that Newco be  substantially  identical in all
material  respects  to ONS,  and  circulated  to the  Exchanging  Partners.  The
Exchanging  Partners  shall  have a  period  of five  Business  Days  after  all
Exchanging  Partners have received such final drafts to raise any  objections to
the contents of such documents,  consistent  with the requirement  that Newco be
substantially  identical in all material  respects to ONS, and the parties shall
negotiate in good faith to resolve any such  objections.  The  resolution of any
such objections  shall be reflected in the Newco Formation  Documents,  and such
documents  shall be  finalized  and  implemented.  ONS  shall  cause  the  Newco
Formation  Documents,  as finalized  and  implemented,  to be  circulated to the
Exchanging  Partners.  If  the  finalized  Newco  Formation  Documents  are  not
consistent with the  requirement  that Newco be  substantially  identical in all
material respects to ONS and any discrepancies are not reasonably  acceptable to
the Exchanging Partners, each of the Exchanging Partners shall have the right to
terminate this Agreement pursuant to the final paragraph of Section 13.1. If all
of the Exchanging  Partners shall not have terminated this Agreement pursuant to
the final  paragraph of Section 13.1 within a period of five Business Days after
all  Exchanging  partners  have received such  finalized and  implemented  Newco
Formation  Documents,  the  "Newco  Finalization  Date"  shall be deemed to have
occurred on the last day of such period.


3.                EXCHANGE OF INTERESTS


                  3.1.      NEWCO PREFERRED STOCK

                  Newco  shall  duly  adopt,  authorize,  execute  and  file the
Certificate of  Designations,  Rights and  Preferences of Series C 6% Cumulative
Redeemable  Convertible  Preferred  Stock  establishing  the terms and  relative
rights and  

                                       3

<PAGE>

preferences of such series of Newco  Preferred Stock in the form set
forth as Exhibit B to this Agreement (the  "Certificate  of  Designations")  and
authorize  the issuance  and sale to the  Exchanging  Partners of the  aggregate
number  of  shares  of Newco  Preferred  Stock to be  issued  to the  Exchanging
Partners  hereunder  (and Newco shall  authorize  the  issuance and sale of such
additional  shares of Newco  Preferred Stock in an amount equal to the aggregate
of the Adjustment Amounts referred to in Section 3.2(c) hereof). The Certificate
of Designations shall be in full force and effect under the laws of the State of
Delaware as of the Closing Date.


                  3.2.      TERMS OF EXCHANGE

                  On the basis of the representations, warranties and agreements
contained herein,  and subject to the terms and conditions  hereof,  each of the
Exchanging Partners hereby agrees to transfer to Newco at the Closing all of its
limited partnership interests in Orion Atlantic (individually,  an "LP Interest"
and  collectively  the "LP  Interests")  and other  rights  relating  thereto as
specified  below  ("Other LP Rights") in exchange for shares of Newco  Preferred
Stock (collectively, the "Exchange"), as follows:

                  (a)      Transfers by the Exchanging Partners to Newco.

                           (i) If BAe is an  Exchanging  Partner,  BAe agrees to
transfer to Newco at the Closing its 25.00% LP  Interest;  all of its rights and
obligations  under the  Partnership  Agreement,  including  all of its rights to
receive  distributions and allocations  thereunder,  and all other rights it may
have as a limited  partner of Orion  Atlantic under  applicable  law; all of its
rights and obligations under the Refund  Agreement,  including all of its rights
to receive  refunds  thereunder;  all of its rights  and  obligations  under the
Consent and  Agreement,  including  all of its rights to  transfer LP  Interests
thereunder;  all of its  rights  and  obligations  under the  Preferred  Bidders
Agreement; all of its rights under the Option Agreement; all of its rights under
the  Subscription  Agreement;  and all of its rights and  obligations  under the
Agreement of Principles (collectively, the "BAe Exchange Assets").

                           (ii) If COM  DEV is an  Exchanging  Partner,  COM DEV
agrees to transfer to Newco at the  Closing  its 4.17% LP  Interest;  all of its
rights and  obligations  under the Partnership  Agreement,  including all of its
rights to receive distributions and allocations thereunder, and all other rights
it may have as a limited partner of Orion Atlantic under  applicable law; all of
its rights and  obligations  under the Refund  Agreement,  including  all of its
rights to receive refunds  thereunder;  all of its rights and obligations  under
the PPU Agreement,  including all of its rights to receive  repayment of amounts
advanced thereunder and interest accrued on such advances; all of its rights and
obligations under the Preferred Bidders  Agreement;  all of its rights under the
Option Agreement; all of its rights under the Subscription Agreement; and all of
its rights and obligations under the Agreement of Principles (collectively,  the
"COM DEV Exchange Assets").

                                       4

<PAGE>

                           (iii) If Kingston is an Exchanging Partner,  Kingston
agrees to transfer to Newco at the  Closing  its 4.17% LP  Interest;  all of its
rights and  obligations  under the Partnership  Agreement,  including all of its
rights to receive distributions and allocations thereunder, and all other rights
it may have as a limited partner of Orion Atlantic under  applicable law; all of
its rights and obligations under the PPU Agreement,  including all of its rights
to receive repayment of amounts advanced thereunder and interest accrued on such
advances,  other than interest paid to Kingston under Section 3.2(d); all of its
rights and obligations under the Preferred Bidders Agreement;  all of its rights
under the Option Agreement;  all of its rights under the Subscription Agreement;
and  all of its  rights  and  obligations  under  the  Agreement  of  Principles
(collectively,   the   "Kingston   Exchange   Assets").   The   Kingston   Sales
Representative  Agreements shall remain in full force without any  modifications
being  effected by this  Agreement,  and Orion  Atlantic,  OrionSat and Kingston
agree that even after the Closing and the  transfer of the  Kingston LP Interest
to Newco,  Kingston shall continue to be treated as if it were a limited partner
of Orion Atlantic for purposes of payment of the Override  Commissions under the
Kingston Sales Representative Agreements only.

                           (iv) If  Lockheed  Martin is an  Exchanging  Partner,
Lockheed  Martin  agrees  to  transfer  to Newco  at the  Closing  its  8.33% LP
Interest;  all of its rights and obligations  under the  Partnership  Agreement,
including all of its rights to receive distributions and allocations thereunder,
and all other rights it may have as a limited  partner of Orion  Atlantic  under
applicable  law; all of its rights and obligations  under the Refund  Agreement,
including all of its rights to receive refunds thereunder; all of its rights and
obligations  under the PPU  Agreement,  including  all of its  rights to receive
repayment of amounts advanced  thereunder and interest accrued on such advances;
all of its rights and obligations under the Preferred Bidders Agreement;  all of
its rights under the Option Agreement;  all of its rights under the Subscription
Agreement;  and  all of its  rights  and  obligations  under  the  Agreement  of
Principles (collectively, the "Lockheed Martin Exchange Assets").

                           (v) If MCN  Sat is an  Exchanging  Partner,  MCN  Sat
agrees to  transfer  (or cause to be  transferred)  to Newco at the  Closing its
8.33% LP  Interest;  all of its rights  and  obligations  under the  Partnership
Agreement,  including all of its rights to receive distributions and allocations
thereunder,  and all  other  rights it may have as a  limited  partner  of Orion
Atlantic  under  applicable  law;  all  of the  rights  and  obligations  of its
Affiliate,  MCN Sat Service S.A., under the Refund  Agreement,  including all of
such  Affiliate's  rights to receive refunds  thereunder;  all of its rights and
obligations  under the PPU  Agreement,  including  all of its  rights to receive
repayment of amounts advanced  thereunder and interest accrued on such advances;
all of its rights and obligations under the Preferred Bidders Agreement;  all of
its rights under the Option Agreement;  all of its rights under the Subscription
Agreement;  and  all of its  rights  and  obligations  under  the  Agreement  of
Principles (collectively, the "MCN Sat Exchange Assets"). (All references herein
to  rights or  obligations  of MCN Sat shall  include  those  which may still be
retained by MMB, the  
                                       5

<PAGE>

transferor  of  MCN  Sat's  LP  Interest.)  The  MCN  Sat  Sales  Representative
Agreements shall remain in full force without any  modifications  being effected
by this  Agreement,  and Orion  Atlantic,  OrionSat  and MCN Sat agree that even
after the Closing and the transfer of the MCN Sat LP Interest to Newco,  MCN Sat
shall  continue to be treated as if it were a limited  partner of Orion Atlantic
for  purposes  of payment of the  Override  Commissions  under the MCN Sat Sales
Representative Agreements only.

                           (vi) If TA Sat is an Exchanging Partner, TA Sat shall
transfer to Newco at the Closing  its 8.33% LP  Interest;  all of its rights and
obligations  under the  Partnership  Agreement,  including  all of its rights to
receive  distributions and allocations  thereunder,  and all other rights it may
have as a limited  partner of Orion  Atlantic under  applicable  law; all of its
rights and obligations under the Refund  Agreement,  including all of its rights
to receive  refunds  thereunder;  all of its rights  and  obligations  under the
Preferred Bidders Agreement;  all of its rights under the Option Agreement;  all
of its  rights  under the  Subscription  Agreement;  and all of its  rights  and
obligations  under  the  Agreement  of  Principles  (collectively,  the  "TA Sat
Exchange Assets").

                  (b)      Transfers by Newco to the Exchanging Partners.

                           (i) If  BAe is an  Exchanging  Partner,  Newco  shall
transfer to BAe at the Closing, in exchange for the BAe Exchange Assets,  43,953
shares  of  Newco  Preferred  Stock,  plus  its  respective  Adjustment  Amount,
calculated as set forth in Section 3.2(c).

                           (ii) If COM DEV is an Exchanging Partner, Newco shall
transfer to COM DEV at the Closing, in exchange for the COM DEV Exchange Assets,
8,302 shares of Newco Preferred Stock,  plus its respective  Adjustment  Amount,
calculated as set forth in Section 3.2(c).

                           (iii) If Kingston  is an  Exchanging  Partner,  Newco
shall transfer to Kingston at the Closing, in exchange for the Kingston Exchange
Assets,  10,222 shares of Newco Preferred Stock, plus its respective  Adjustment
Amount,  calculated  as set forth in  Section  3.2(c)  and PPU  Interest  Shares
calculated as set forth in Section 3.2(d).

                           (iv) If  Lockheed  Martin is an  Exchanging  Partner,
Newco shall  transfer to Lockheed  Martin at the  Closing,  in exchange  for the
Lockheed Martin Exchange Assets,  17,143 shares of Newco Preferred  Stock,  plus
its respective Adjustment Amount, calculated as set forth in Section 3.2(c).

                           (v) If MCN Sat is an Exchanging Partner,  Newco shall
transfer to MCN Sat at the Closing, in exchange for the MCN Sat Exchange Assets,
15,746 shares of Newco Preferred Stock, plus its respective  Adjustment  Amount,
calculated as set forth in Section 3.2(c).

                                       6


<PAGE>

                           (vi) If TA Sat is an Exchanging Partner,  Newco shall
transfer to TA Sat at the Closing,  in exchange for the TA Sat Exchange  Assets,
12,426 shares of Newco Preferred Stock, plus its respective  Adjustment  Amount,
calculated as set forth in Section 3.2(c).

                  The number of shares of Newco  Preferred  Stock  specified  in
this  Section   3.2(b),   in  Sections  3.2(c)  and  3.2(d)  shall  be  adjusted
proportionately  to  reflect  any  subdivision,  stock  split,  stock  dividend,
recapitalization,  combination  or reverse  stock split of ONS capital  stock or
similar transaction by ONS between the date hereof and the Closing Date.

                  (c)      Adjustment Amounts.

                  The numbers of shares of Newco Preferred Stock to be issued to
the  respective  Exchanging  Partners  as  listed  in  Section  3.2(b)  shall be
increased by the Adjustment  Amount for such Exchanging  Partner,  calculated as
set forth below. The "Adjustment  Amount" for an Exchanging  Partner shall equal
(i) the sum of (A) the amounts paid by such  Exchanging  Partner for obligations
(or an Affiliate of such Exchanging  Partner) pursuant to the Capacity Agreement
(as  defined  below)  and which is subject  to being  refunded  under the Refund
Agreement,  and by such Exchanging  Partner pursuant to the Contingent  Capacity
Agreement (as defined below), in each case to which such Exchanging  Partner (or
an Affiliate of such Exchanging Partner) is a party, during the period from July
1, 1996 through the Closing Date (the "Adjustment Period"),  plus (B) the amount
of interest  accrued with respect to funds advanced by such  Exchanging  Partner
(or an  Affiliate  of  such  Exchanging  Partner)  other  than  Kingston  (or an
Affiliate  of  Kingston)  pursuant to the PPU  Agreement  during the  Adjustment
Period,  minus (ii) the product of the number of days in the  Adjustment  Period
multiplied by the Tax Adjustment Factor for such Exchanging Partner,  divided by
(iii)  $1,000.  To the extent that amounts are due or payable from an Exchanging
Partner  or  Affiliate  under its  Capacity  Agreement  or  Contingent  Capacity
Agreement during the Adjustment  Period,  but are not actually paid prior to the
Closing  Date,  such  amounts  shall not be  included  in clause  (i)(A) of this
paragraph.  Similarly,  to the extent  that  amounts  are paid by an  Exchanging
Partner  or  Affiliate  under its  Capacity  Agreement  or  Contingent  Capacity
Agreement  during the  Adjustment  Period  for  obligations  of such  Exchanging
Partner  arising  after  the  Closing,  such  amount  shall be  refunded  to the
Exchanging  Partner at the Closing.  Nothing in this paragraph  shall affect the
obligations  of any  Exchanging  Partner to make any payment  under its Capacity
Agreement or  Contingent  Capacity  Agreement  during the  Adjustment  Period or
otherwise, or affect the amount of interest accruing under the PPU Agreement.

                  (d)      Kingston Investment in PPU Interest Shares.

                  Notwithstanding  the  exchange  of  Kingston  Exchange  Assets
pursuant to Sections 3.2(a)(iii) and 3.2(b)(iii),  at the Closing Orion Atlantic
shall pay to 

                                       7

<PAGE>


Kingston in cash the total interest  accrued until Closing with respect to funds
advanced  by  Kingston  pursuant to the PPU  Agreement  (the "Total  Accrued PPU
Interest").  Kingston  shall at the Closing  invest an amount equal to the Total
Accrued  PPU  Interest  in shares of Newco  Preferred  Stock (the "PPU  Interest
Shares").  Since the amount to be paid to Kingston  under this  paragraph is the
same as the amount to be  invested by  Kingston,  Orion  Atlantic  shall pay the
Total Accrued PPU Interest directly to Newco at the Closing. The total number of
shares of Newco  Preferred  Stock to be issued to  Kingston  for its  investment
under this paragraph shall equal (i) the Total Accrued PPU Interest,  minus (ii)
the product of the number of days in the Adjustment Period multiplied by the Tax
Adjustment  Factor for such  Exchanging  Partner  (to the extent Tax  Adjustment
Factor was not fully applied in (c) above), divided by (iii) $1,000.


                  3.3.     ALLOCATION OF NEWCO PREFERRED STOCK

                           The  Newco  Preferred  Stock  to be  issued  to  each
Exchanging  Partner at the  Closing  shall be  allocated  among such  Exchanging
Partner's  Exchange  Assets  as  follows:  first,  to the  rights  under the PPU
Agreement,  including rights to receive repayment of amounts advanced thereunder
and  interest  accrued  on  such  advances,  and the  rights  under  the  Refund
Agreement, including rights to receive refunds thereunder, until such Exchanging
Partner has  received  Newco  Preferred  Stock with a fair market value equal to
such  rights;  and second,  to such  Exchanging  Partner's LP Interest and other
Exchange Assets.


4.                MERGER


                  4.1.     FORMATION OF SUBSIDIARY OF NEWCO

                  Newco shall form a new Delaware  corporation to be named Orion
Merger Company,  Inc. ("Merger Sub"), and Newco shall be the sole stockholder of
Merger Sub.


                  4.2.     TERMS OF MERGER

                  On the basis of the representations, warranties and agreements
contained in a merger agreement, and subject to the terms and conditions hereof,
at the  Closing  Merger Sub shall be merged into ONS  pursuant  to the  Delaware
General  Corporation Law in a merger in which ONS shall be the surviving company
and all of the assets, rights,  property,  liabilities and obligations of Merger
Sub and ONS shall be  vested in ONS as the  surviving  company  (the  "Merger").
Pursuant  to the  Merger,  holders  of all of the  capital  stock  of ONS  shall
receive, as consideration for their capital stock of ONS, an identical number of
shares of  substantially  identical  capital  stock  (common  or  preferred,  as
applicable, with the same relative rights and preferences) of Newco.

                                       8

<PAGE>


                  4.3.     TRANSFER OF CERTAIN CONTRACTS

                  In connection  with the Merger,  all contracts and  agreements
relating to capital stock of ONS in effect at the Closing shall be replaced with
contracts  and  agreements  substantially  equivalent  in all material  respects
relating  to the  capital  stock of Newco,  including  without  limitation,  all
options,  warrants and other rights to purchase  capital stock and all contracts
relating  to  registration  rights,  voting of  shares,  transfer  of shares and
similar matters.


                  4.4.     MERGER DOCUMENTS

                  ONS  shall  cause  all   necessary   documents   (the  "Merger
Documents")  to effect the Merger and other matters  referred to in Section 4 to
be prepared and  circulated to the  Exchanging  Partners for review and comment.
The  Exchanging  Partners  agree to submit any comments on the Merger  Documents
within 10 Business  Days after receipt of the initial  drafts of such  documents
and within five  Business Days after  receipt of  subsequent  drafts.  ONS shall
cause final drafts of the Merger  Documents to be prepared and circulated to the
Exchanging  Partners.  The  Exchanging  Partners  shall  have a  period  of five
Business Days after receipt of such final drafts to raise any  objections to the
contents of such  documents,  and the parties  shall  negotiate in good faith to
resolve any such  objections.  The  resolution of any such  objections  shall be
reflected in the Merger Documents, and such documents shall be put in final form
for execution at the Closing.


5.                ADDITIONAL UNDERTAKINGS AND COVENANTS

                  ONS and OrionSat,  jointly and severally on the one hand,  and
the  Exchanging  Partners,  severally and not jointly on the other hand,  hereby
covenant and agree with each other as follows:


                  5.1.     CONSENTS AND APPROVALS

                  ONS and OrionSat shall take all measures reasonably  necessary
or  advisable  to  secure  such  consents,   authorizations   and  approvals  of
governmental  authorities and of private persons or entities with respect to the
transactions contemplated by this Agreement, and to the performance of all other
obligations  of such  parties  hereunder,  as may be required by any  applicable
statute  or  regulation  of the  United  States or any  country,  state or other
jurisdiction  or by any agreement of any kind whatsoever to which any of them is
a party or by which any of them is bound  and  which  are set forth on  Schedule
7.3.  Notwithstanding  Sections 6.4 and 7.3, subsequent to the execution of this
Agreement  and prior to the  Closing  Date,  ONS,  OrionSat  and the  Exchanging
Partners  shall take all  measures  reasonably  necessary or advisable to secure
such consents,  authorizations and approvals of governmental  authorities and of
private  persons or entities with respect to the  

                                       9
<PAGE>

transactions contemplated by this Agreement, and to the performance of all other
obligations  of such  parties  hereunder,  as may be required by any  applicable
statute  or  regulation  of the  United  States or any  country,  state or other
jurisdiction  or by any agreement of any kind whatsoever to which any of them is
a party or by which  any of them is  bound.  ONS,  OrionSat  and the  Exchanging
Partners shall (a) cooperate in the filing of all forms, notifications,  reports
and information,  if any,  required or reasonably  deemed advisable  pursuant to
applicable  statutes,  rules,  regulations  or  orders  of any  governmental  or
supragovernmental  authority in connection with the transactions contemplated by
this  Agreement  and (b) use their  respective  good faith  efforts to cause any
applicable  waiting  periods  thereunder  to expire  and any  objections  to the
transactions contemplated hereby to be withdrawn before the Closing.


                  5.2.     APPROVAL BY STOCKHOLDERS OF ONS

                  In  addition  to the  consents  and  approvals  referred to in
Section 5.1 above, ONS shall take all measures reasonably necessary or advisable
to secure all  required  consents  of the  stockholders  of ONS  (including  the
consent of holders of ONS' preferred stock) to the Merger,  the Exchange and any
related  transactions  requiring  stockholder  consent  (collectively,  with any
required consent of ONS' preferred stockholders, the "ONS Stockholder Consent").
The parties acknowledge that in order to obtain the ONS Stockholder Consent, ONS
will need to file a merger proxy statement with the United States Securities and
Exchange  Commission  ("SEC"),  revise the merger proxy statement in response to
comments  from the SEC,  obtain  approval of the SEC of the final version of the
merger proxy statement before it is mailed to ONS  stockholders,  call a meeting
of  stockholders  of ONS for  approximately  30 days  after  such  merger  proxy
statement is mailed to ONS  stockholders  and obtain the  requisite  stockholder
vote at the meeting  (such  merger proxy  statement,  including  all  amendments
thereto is referred to herein as the "Merger Proxy  Statement").  The Exchanging
Partners  shall  cooperate  with ONS in  preparing  and filing the Merger  Proxy
Statement  with the SEC and in  obtaining  SEC  clearance  of the  Merger  Proxy
Statement,  including supplying  information on each Exchanging Partner which is
reasonably  necessary  or  advisable  for ONS to  include  in the  Merger  Proxy
Statement or to be provided to any  government  agency or authority  pursuant to
applicable  statutes,  rules,  regulations  or  orders  of any  governmental  or
supragovernmental authority in connection with the Merger and other transactions
contemplated by this Agreement;  provided,  however, that none of the Exchanging
Partners   shall  be  required  to  supply  any   confidential   or  proprietary
information.  ONS shall use its good faith efforts to cause the ONS  Stockholder
Consent to be obtained  expeditiously  and any objections of ONS Stockholders to
the Merger and other transactions contemplated hereby to be withdrawn before the
Closing.

                                       10

<PAGE>



            5.3.  REFINANCING  OF  CREDIT  FACILITY;  CANCELLATION  OF  CAPACITY
                  AGREEMENTS

                  It is presently  contemplated that Newco, Orion Atlantic,  ONS
and OrionSat will, as of the Closing Date,  complete a refinancing  (the "Credit
Facility  Refinancing") of the indebtedness of Orion Atlantic  outstanding under
the Credit Agreement (the "Credit  Facility") dated December 6, 1991 among Orion
Atlantic,  the Banks named therein (the  "Lenders") and The Chase Manhattan Bank
(National  Association),  as Agent  ("Chase")  using proceeds of an underwritten
offering of notes or debentures of Newco to the public (a "Bond Offering").  The
Credit Facility Refinancing is to effect the Capacity Agreement  Termination and
release of the Capacity  Guarantees,  as discussed  (and defined)  below in this
Section 5.3.  ONS shall use its good faith  efforts to cause Newco to complete a
Bond Offering on reasonable commercial terms. Notwithstanding the foregoing, the
parties acknowledge and agree that the terms of a Bond Offering are likely to be
determined in large part by the  requirements  of prospective  investors in that
Bond  Offering,  and that Newco and ONS reserve the right not to proceed  with a
Bond Offering if they determine that such Bond Offering would not be in the best
interest  of the  stockholders  of Newco or the  stockholders  of ONS (who would
become  stockholders of Newco in the Merger)  generally,  including the entities
who would be  becoming  stockholders  of Newco  pursuant to the  Exchange).  ONS
agrees to inform the Exchanging Partners periodically and in a timely fashion of
the progress of the Bond  Offering,  including  the terms being  proposed by the
underwriters  thereof, and the Exchanging Partners may advise ONS of their views
regarding  the terms of the Bond  Offering.  Newco is to use the proceeds of the
Bond Offering first for the Credit Facility Refinancing (including costs of such
transaction and the costs of terminating the interest rate protection agreements
entered  into in  connection  with the  Credit  Facility),  and if any  proceeds
remain,  then for financing of a second  satellite with coverage of the Atlantic
Ocean region and Europe ("Orion 2") or for working capital.

                  In connection  with the Credit  Facility  Refinancing,  Newco,
Orion  Atlantic,  ONS,  OrionSat  and the  Exchanging  Partners  shall  take all
measures  reasonably  necessary or advisable to cause the termination (the "Bank
Agreement Termination"), concurrently with the completion of the Credit Facility
Refinancing,  of all agreements  between or among the Lenders and Chase,  on the
one  hand,  and one or more of  Newco,  Orion  Atlantic,  OrionSat,  ONS and the
Exchanging  Partners and/or their affiliates on the other hand,  relating to the
Credit  Facility or the security or credit support  thereof,  including  without
limitation,  in the case of each Exchanging  Partner and/or their affiliates,  a
Consent and  Agreement,  an  Assignment  and Security  Agreement and a Guarantee
Agreement (the "Credit Facility Documents"). However, the previous sentence will
not oblige the Exchanging Partners to incur any liability in connection with the
Bank Agreement Termination.

                                       11

<PAGE>

                  In connection  with the Credit  Facility  Refinancing  and the
Bank  Agreement  Termination,  Newco,  Orion  Atlantic,  ONS,  OrionSat  and the
Exchanging Partners shall take all measures reasonably necessary or advisable to
cause the termination (the "Capacity Agreement Termination"),  concurrently with
the  completion  of the  Credit  Facility  Refinancing  and the  Bank  Agreement
Termination,  of all obligations  under the  Communications  Satellite  Capacity
Agreements  and the  Contingent  Communications  Satellite  Capacity  Agreements
between  Orion  Atlantic  and  each  of the  Exchanging  Partners  and/or  their
affiliates (the "Capacity  Agreements" and the "Contingent Capacity Agreements,"
respectively) arising from and after the Capacity Agreement Termination, and all
guarantees or other credit support of such obligations ("Capacity  Guarantees");
provided,  however,  that (i) the  Capacity  Agreements  of Kingston and MCN Sat
Service S.A. (but not the associated  Capacity  Guarantees) shall remain in full
force and effect,  (ii) the Kingston Capacity Agreement shall be deemed amended,
effective as of the Closing (and Kingston and Orion  Atlantic  shall execute and
deliver  such  written  documents   evidencing  such  amendment  as  either  may
reasonably  request),  to reduce to 17 MHz the amount of capacity subject to the
Kingston Capacity Agreement (of which 8 MHz shall be the capacity presently used
by Kingston  under the Kingston  Capacity  Agreement and of which 9 MHz shall be
the  capacity  presently  used  by  Kingston  under  one  of  the  BAe  Capacity
Agreements),  with an option (subject to availability) to increase the amount of
capacity  subject to the  Kingston  Capacity  Agreement  for use by  Kingston in
providing its network service  products,  but not for resale, up to a maximum of
27 MHz at the same rate and on the same terms and conditions as set forth in the
Kingston  Capacity  Agreement,  but (to the extent easily effected  technically)
without  any  obligation  to take  such  capacity  in 9 MHz  units or any  other
pre-determined  denomination,  and  (iii)  the MCN  Sat  Service  S.A.  Capacity
Agreement  shall be deemed  amended,  effective  as of the Closing  (and MCN Sat
Service S.A. and Orion Atlantic shall execute and deliver such written documents
evidencing such amendment as either may reasonably request), to reduce to 18 MHz
the amount of capacity subject thereto.


            5.4.  AMENDMENT AND RESTATEMENT OF PARTNERSHIP AGREEMENT

                  The Partnership  Agreement shall be amended and restated as of
the Closing  Date to read in its  entirety as set forth in Exhibit C (the "Third
Amended and Restated Partnership Agreement"),  and each of ONS, OrionSat and the
Exchanging Partners agree to execute,  and deliver at the Closing,  counterparts
to the Third Amended and Restated Partnership Agreement.


            5.5.  REGISTRATION RIGHTS

                  Concurrently   with  the  Closing,   Newco  and  each  of  the
Exchanging Partners shall execute and deliver a Registration Rights Agreement in
the form set forth as Exhibit D (the "Registrations Rights Agreement").

                                       12
<PAGE>


            5.6.  ACCESS; INVESTIGATIONS BY THE EXCHANGING PARTNERS

                  ONS   shall,    through   the   Closing   Date,   provide   to
representatives  of the Exchanging  Partners  reasonable  access to the offices,
books, agreements and records of ONS and its Subsidiaries and Newco, and furnish
to  representatives  of the Exchanging  Partners such financial and  operational
data and other  information  with  respect to the business and assets of ONS and
its  Subsidiaries and Newco as the Exchanging  Partners may reasonably  request.
The  Exchanging  Partners  agree at all times  through the  Closing  Date to use
reasonable efforts, at least as stringent as those employed by them with respect
to  their  own  confidential  information,  (a) to keep  confidential  all  such
information that is identified as being of a confidential nature, (b) not to use
such confidential information on their own behalf, except in connection with the
transactions  contemplated  hereby,  or on behalf of any other  person,  firm or
entity, and (c) not to disclose such confidential information to any third party
(other than to the Exchanging  Partners' various counsel,  accountants and other
consultants in connection  with the  transactions  contemplated  hereby) without
ONS' advance  written  authorization;  provided,  however,  that the  Exchanging
Partners shall have no such obligations with respect to confidential information
that  (i)  was  lawfully  obtained  by  them  not  subject  to  restrictions  of
confidentiality;  (ii) is a matter of public knowledge;  or (iii) has been or is
hereafter publicly  disclosed other than by or through the Exchanging  Partners.
In the event this Agreement is terminated,  the Exchanging  Partners will return
to ONS all  documents  and other  materials  furnished to any one or more of the
Exchanging Partners relating to the transactions contemplated hereunder, whether
obtained  before or after the  execution  of this  Agreement.  In the event of a
breach or threatened breach by the Exchanging Partners of the provisions of this
Section 0, ONS shall be entitled to an injunction  restraining  such  Exchanging
Partners from disclosing, in whole or in part, such information.  The Exchanging
Partners  investigation  of the  financial  and  operating  data,  assets,  real
property  and other  information  with respect to the business and assets of ONS
and its  Subsidiaries  and Newco shall in no way affect the  obligations  of ONS
with  respect to the  agreements,  representations,  warranties,  covenants  and
indemnification provisions set forth in this Agreement.


            5.7.  WAIVER  OF  RIGHT  OF  FIRST  REFUSAL  UNDER  THE  PARTNERSHIP
                  AGREEMENT

                  Pursuant  to Section  13.09(b) of the  Partnership  Agreement,
ONS,  OrionSat and each of the Exchanging  Partners hereby amend the Partnership
Agreement, as of the date hereof, to the extent necessary to cause Section 10.04
thereof,  which  section  contains  the  partners'  right of first  refusal with
respect to the sale of limited partnership  interests of Orion Atlantic,  not to
apply to the Exchange or any of the transactions  referred to in this Agreement,
and hereby waives any rights it may have under Section 10.04 of the  Partnership
Agreement,  with respect to the Exchange or any of the transactions  referred to
in this Agreement.

                                       13

<PAGE>


            5.8.  CONVERTIBLE SUBORDINATED DEBENTURES

                  It is  presently  contemplated  that  Newco  will,  as of  the
Closing Date,  complete an offering  (the  "Convertible  Subordinated  Debenture
Offering") of approximately $100 million of convertible  subordinated debentures
of Newco ("Convertible Subordinated  Debentures").  ONS shall use its good faith
efforts  to cause  Newco to  complete  the  Convertible  Subordinated  Debenture
Offering.  Notwithstanding the foregoing, the parties acknowledge and agree that
the terms of a  Convertible  Subordinated  Debenture  Offering  are likely to be
determined  in  large  part by the  requirements  of  prospective  investors  in
Convertible  Subordinated Debenture Offering, and that Newco and ONS reserve the
right not to proceed with a Convertible  Subordinated Debenture Offering if they
determine that such Convertible  Subordinated Debenture Offering would not be in
the best interest of the  stockholders of Newco or the  stockholders of ONS (who
would  become  stockholders  of Newco in the Merger)  generally,  including  the
entities who would be becoming  stockholders of Newco pursuant to the Exchange).
ONS  agrees to  inform  the  Exchanging  Partners  periodically  and in a timely
fashion of the  progress of the  Convertible  Subordinated  Debenture  Offering,
including  the terms being  proposed by the  underwriters  or  placement  agents
thereof, and the Exchanging Partners may advise ONS of their views regarding the
terms of the Convertible  Subordinated Debenture Offering. ONS intends for Newco
to  use  BAe's  $50  million  expected  payment  for  Convertible   Subordinated
Debentures and an additional $10 million of the proceeds of the offering for the
financing  of Orion 2.  While not  intended  to be legally  binding,  BAe hereby
confirms  that it intends to  purchase  from  Newco $50  million of  Convertible
Subordinated  Debentures on substantially the same terms as the remainder of the
offering of the Convertible Subordinated Debentures.


            5.9.  AGREEMENT REGARDING TRANSFER

                  Concurrent  with the  Closing,  each  Exchanging  Partner will
enter into an  agreement,  in the form set forth as Exhibit E hereto,  regarding
the transfer of the shares of Newco Common Stock issuable upon conversion of the
Newco Preferred Stock.


            5.10. RELEASE OF CLAIMS

                  Concurrently  with the  Closing,  each of the  parties  hereto
agrees to release and forever  discharge  each of the other  parties  hereto and
each of their  Affiliates  from and after the Closing,  from and against any and
all rights,  causes of action,  claims,  suits,  obligations,  liabilities,  and
demands  whatsoever (other than those arising from fraud or  misrepresentation),
in law or in equity,  whether presently known or unknown,  to the fullest extent
permitted by law by reason of,  related to, or arising out of any one or more of
the agreements referred to in Section 3.2 hereof (other than this Agreement).

                                       14

<PAGE>


            5.11. LEGEND, REMOVAL

                  Each  certificate or instrument  representing  Newco Preferred
Stock  (or  Newco  Common  Stock  received  upon the  conversion  thereof  or as
dividends  thereon)  shall be  imprinted  with a legend to the  effect  that the
securities  have not been  registered  under the  Securities  Act and may not be
transferred  or sold except  pursuant  to an  effective  registration  under the
Securities Act and applicable  state  securities laws or an available  exemption
from such  registration.  In connection with the transfer of any Newco Preferred
Stock  (or  Newco  Common  Stock  received  upon the  conversion  thereof  or as
dividends  thereon) other than pursuant to an effective  registration  statement
filed  by ONS,  the  holder  thereof  shall  deliver  written  notice  to  Newco
describing in reasonable detail the transfer or proposed transfer, together with
an  opinion  of  counsel   which  (to  Newco's   reasonable   satisfaction)   is
knowledgeable in securities law matters to the effect that such transfer of such
securities may be effected  without  registration of such  securities  under the
Securities Act. Upon issuance of such opinion (to the extent it relates to Newco
Preferred Stock) or acceptance of such opinion by Newco's transfer agent (to the
extent it  relates  to Newco  Common  Stock),  Newco  shall  promptly  upon such
contemplated  transfer  deliver or caused to be delivered new  certificates  for
such securities which do not bear the Securities Act legend referred to above in
this  paragraph.  If any Newco  Preferred  Stock (or Newco Common Stock received
upon the conversion  thereof or as dividends  thereon) becomes eligible for sale
pursuant to Rule  144(k),  Newco  shall,  upon the request of the holder of such
securities (together with the opinion referred to above in this paragraph, which
shall state that the provisions of Rule 144(k) have been complied with),  remove
the legend  referred to above in this paragraph from the  certificates  for such
securities.


            5.12. TAX-FREE STATUS

                  No party hereto  shall,  nor shall any party hereto permit any
of its affiliates to, take any action, or omit to take any required action, that
would, or would be reasonably  likely to, adversely affect the  qualification of
the Merger and the Exchange, taken together, as a tax-free transaction described
in Code Section 351(a). Each party hereto shall, for all tax purposes, treat the
Merger and the Exchange,  taken together, as a tax-free transaction described in
Code Section 351(a).


6.                REPRESENTATIONS AND WARRANTIES OF EXCHANGING PARTNERS

                  Each of the Exchanging  Partners hereby  severally  represents
and warrants to ONS as follows (provided that the representations and warranties
in Section 6.8 are made solely by Lockheed Martin):

                                       15

<PAGE>


            6.1.  TITLE TO LP INTERESTS; OTHER LP RIGHTS

                  Such  Exchanging  Partner is, and on the Closing Date will be,
the  lawful  owner  of the LP  Interest  of such  Exchanging  Partner,  and such
Exchanging Partner (or such Exchanging Partner's Affiliate, as the case may be),
is and on the  Closing  Date  will  be,  the  lawful  owner  of such  Exchanging
Partner's (or Affiliate's)  Other LP Rights, as listed in Section 3.2. Except as
set forth  below,  such  Exchanging  Partner  has,  and on the Closing Date such
Exchanging  Partner will have, good, valid and marketable  title, free and clear
of all  Encumbrances,  to the LP Interest of such Exchanging  Partner,  and such
Exchanging Partner (or such Exchanging Partner's Affiliate, as the case may be),
has, and on the Closing Date will have, good, valid and marketable  title,  free
and clear of all  Encumbrances,  to such Exchanging  Partner's (or  Affiliate's)
Other LP  Rights,  as listed in  Section  3.2,  in each case with full right and
lawful  authority  to  transfer  the LP  Interest  and  Other LP Rights to Newco
pursuant  to  this  Agreement.   Notwithstanding  the  foregoing,   the  parties
acknowledge that the LP Interests and certain of the Other LP Rights are pledged
to the  Lenders  under  the  Credit  Facility  Documentation,  and  that  the LP
Interests are pledged to Orion Atlantic under the respective Contingent Capacity
Agreements.


            6.2.  ORGANIZATION AND STANDING; CAPACITY

                  Such  Exchanging  Partner  is a  corporation  duly  organized,
validly  existing  and in  good  standing  under  the  laws  of  its  respective
jurisdiction,  and has the full  corporate  power and  authority to carry on its
business as currently  conducted.  Each Exchanging Partner has full legal right,
capacity,  power and  authority  (corporate or otherwise) to execute and deliver
this Agreement and to consummate the transactions contemplated hereby.


            6.3.  AUTHORIZATION

                  The  execution,  delivery and  performance  by the  Exchanging
Partner of this  Agreement  and all other  documents  contemplated  hereby,  the
fulfillment  of and the  compliance  with the  respective  terms and  provisions
hereof and thereof, and the consummation of the transactions contemplated hereby
and  thereby  have  been  duly  authorized  by the  Board of  Directors  of such
Exchanging  Partner (which  authorization has not been modified or rescinded and
is in full force and effect),  and will not: (a) conflict  with,  or  materially
violate  any  provision  of, any law  having  applicability  to such  Exchanging
Partner  or any of its  Affiliates  which  is a party to any  agreement  with or
relating  to  Orion  Atlantic  or any  term  or  provision  of the  articles  of
incorporation  or  organization,  or  bylaws  or  operating  agreement  of  such
Exchanging  Partner or any of such  Affiliates,  as applicable;  or (b) conflict
with,  or result in any material  breach of, or  constitute  a material  default
under, any agreement to which such Exchanging  Partner or any of such Affiliates
is a party or by which such Exchanging  Partner or any of such Affiliates may be
bound.

                                       16

<PAGE>


            6.4.  RESTRICTIONS AND CONSENTS

                  Except for  certain  approvals  which may be  required  by the
Japanese  government  if TA Sat  becomes  an  Exchanging  Partner,  there are no
agreements,  laws or other  restrictions  of any kind to which  such  Exchanging
Partner  is party or subject  that would  prevent  or  restrict  the  execution,
delivery or performance of this Agreement.


            6.5.  BINDING OBLIGATION

                  This Agreement  constitutes a valid and binding  obligation of
such Exchanging Partner, enforceable in accordance with its terms. Each document
to be executed by such Exchanging  Partner  pursuant  hereto,  when executed and
delivered in accordance with the provisions hereof,  will be a valid and binding
obligation of such Exchanging Partner, enforceable in accordance with its terms.


            6.6.  TRANSFER OF TITLE

                  At the Closing,  Newco will acquire good, valid and marketable
title to such  Exchanging  Partner's LP Interest and such  Exchanging  Partner's
Other LP Rights, free and clear of all Encumbrances, other than those imposed by
the terms of the Partnership  Agreement and  restrictions on resale contained in
federal and state securities laws.


            6.7.  ACCREDITED INVESTORS

                  Each  Exchanging  Partner and any Affiliate of such Exchanging
Partner who will be receiving Newco Preferred Stock is an "accredited  investor"
as such term is defined in Rule 501 of the Securities Act.


            6.8.  NAME CHANGE OF LOCKHEED MARTIN

                  Lockheed  Martin only hereby  represents  and warrants that it
was formerly named Martin Marietta Commercial Launch Services,  Inc., that it is
a limited partner of Orion Atlantic and a party to the agreements referred to in
Section  3.2(a)(iv) and that it has provided  evidence of its name change to the
other parties hereto.


7.                REPRESENTATIONS AND WARRANTIES OF ONS

                  ONS hereby represents and warrants to the Exchanging  Partners
as follows:

                                       17
<PAGE>


            7.1.  ORGANIZATION AND STANDING

                  ONS is a corporation  duly organized,  validly existing and in
good  standing  under  the  laws of the  State  of  Delaware,  and has the  full
corporate  power and authority to carry on its business as currently  conducted.
ONS has the full  legal  right,  capacity,  power and  authority  (corporate  or
otherwise) to execute and deliver this Agreement and the other documents  called
for  herein and to  consummate  the  transactions  contemplated  hereby.  ONS is
qualified as a foreign corporation in the State of Maryland,  and in every other
jurisdiction  in which the failure to so qualify  would have a Material  Adverse
Effect.


            7.2.  AUTHORIZATION

                  The  execution,  delivery  and  performance  by  ONS  of  this
Agreement and the other documents  contemplated  hereby,  the fulfillment of and
the compliance with the respective terms and provisions hereof and thereof,  and
the consummation of the transactions  contemplated  hereby and thereby have been
duly  authorized by the Board of Directors of ONS (which  authorization  has not
been modified or rescinded  and is in full force and effect),  and will not: (a)
conflict  with,  or  materially   violate  any  provision  of,  any  law  having
applicability  to ONS or any of its  Affiliates  or any term or provision of the
articles of incorporation or organization,  or bylaws or operating  agreement of
ONS, as applicable;  or (b) conflict with, or result in any material  breach of,
or constitute a material default under, any agreement to which ONS or any of its
Affiliates is a party or by which ONS or any of its Affiliates may be bound.


            7.3.  RESTRICTIONS AND CONSENTS

                  Except for certain  approvals  which are set forth on Schedule
7.3, which ONS will use its reasonable efforts to obtain prior to Closing, there
are no agreements,  laws or other restrictions of any kind to which ONS is party
or subject that would prevent or restrict the execution, delivery or performance
of this Agreement. ONS has no reason to believe, as of the date hereof, that any
of the conclusions reached in the memorandum from ONS's  communications  counsel
previously  circulated to the Exchanging Partners and attached hereto as Exhibit
K indicating  that the Exchange  will not  constitute a change of control of ONS
that would  require the consent of the U.S.  Federal  Communications  Commission
("FCC"),  or otherwise require the consent of that Commission,  are incorrect in
any material  respect and will promptly  notify each  Exchanging  Partner if ONS
becomes aware of any reason why any such conclusions may become  incorrect.  If,
notwithstanding such memorandum,  such FCC consent is required, ONS will use its
reasonable good faith efforts to obtain such consent prior to Closing.

                                       18

<PAGE>


            7.4.  BINDING OBLIGATION

                  This  Agreement  constitutes,   and  the  Registration  Rights
Agreement when executed will  constitute,  valid and binding  obligations of ONS
and Newco, as the case may be,  enforceable in accordance  with its terms.  Each
document to be executed  by ONS or Newco  pursuant  hereto,  when  executed  and
delivered in accordance with the provisions hereof,  will be a valid and binding
obligation of ONS or Newco, enforceable in accordance with its terms.


            7.5.  ISSUANCE OF SHARES

                  Upon  consummation  of the  transactions  contemplated by this
Agreement at Closing, the Newco Preferred Stock will be duly and validly issued,
fully paid and nonassessable and no personal liability attaches to the ownership
thereof,  and  the  Exchanging  Partners  will  acquire  the  legal,  valid  and
marketable  title  to  the  Newco  Preferred  Stock,   free  and  clear  of  all
Encumbrances, except as set forth in this Agreement.


            7.6.  CAPITALIZATION

                  As of the date hereof,  the  authorized  capital  stock of ONS
consists  of  40,000,000  shares of ONS  Common  Stock and  1,000,000  shares of
preferred  stock,  par value $.01 per share, of which  10,945,133  shares of ONS
Common Stock, 13,961 shares of ONS Series A Preferred Stock and 4,211,001 shares
of ONS Series B  Preferred  Stock are duly  authorized  and  validly  issued and
outstanding,  fully  paid and  nonassessable.  ONS has no  other  class of stock
authorized or outstanding.  Options and warrants to purchase 1,396,851 shares of
ONS Common Stock are  outstanding on the date hereof,  and when such options are
exercised and the prescribed exercise price paid, the shares of ONS Common Stock
issued with  respect to such options will be duly  authorized,  validly  issued,
fully  paid  and  nonassessable.  Options  to  purchase  350.666  shares  of ONS
preferred stock are outstanding on the date hereof, the terms of which are to be
substantially identical to the ONS Series A Preferred Stock and the ONS Series B
Preferred Stock other than the conversion  price.  Except as set forth above, or
in the  certificates of designations of the ONS Series A Preferred Stock and ONS
Series B Preferred  Stock, as of the date hereof there are no existing  options,
warrants or rights to purchase or otherwise  acquire  from ONS capital  stock of
ONS of any class,  no outstanding  securities of ONS that are  convertible  into
shares of capital stock of ONS of any class, and no options,  warrants or rights
to purchase from ONS any such convertible securities, and ONS has no outstanding
contractual or other obligation to repurchase,  redeem or otherwise  acquire any
outstanding shares of its capital stock. Upon the issuance of Newco Common Stock
upon  the  conversion  of the  Newco  Preferred  Stock  in  accordance  with the
Certificate  of  Designations,  such Newco Common Stock will be duly and validly
issued,  fully paid and  non-assessable and no personal liability will attach to
the ownership  thereof.  As of the Closing Date, Newco will have reserved

                                       19

<PAGE>

out of its  authorized  but unissued  shares of Newco Common  Stock,  solely for
issue upon such conversion,  the number of shares necessary for such purpose. As
of the  Closing  Date,  Newco  will have  sufficient  authorized  capital  stock
(including Newco Preferred Stock) to meet its obligations hereunder.  The issued
and  outstanding  shares  of ONS  capital  stock  have not  been,  and the Newco
Preferred  Stock to be issued to the  Exchanging  Partners  hereunder (and Newco
Common  Stock  issuable  upon the  conversion  thereof)  will not be,  issued in
violation of any  preemptive or other rights of any person,  whether  arising by
statute,  under the Certificate of  Incorporation  or By-Laws of Newco or in any
other manner.


            7.7.  NO LIABILITIES

                  Except  as set  forth in the  consolidated  audited  financial
statements of ONS as of December 31, 1995, and for the period ended on such date
(the "Current Financial  Statements"),  or included in the Disclosure Materials,
there exist no material liabilities (whether contingent or absolute,  matured or
unmatured, known or unknown) of ONS or any Subsidiary.  Immediately prior to the
Closing,  Newco will have no  liabilities  (other  than de  minimis  liabilities
relating  to Newco's  formation,  any  liabilities  or  obligations  relating to
transactions  contemplated by this  Agreement,  and any liabilities for expenses
relating to the Credit  Facility  Refinancing,  Bond  Offering,  Bank  Agreement
Termination,   Capacity  Agreement  Termination  and  Convertible   Subordinated
Debenture Offering).


            7.8.  TAXES

                  ONS and each  Subsidiary  has filed or has  caused to be filed
(or has obtained  extensions  with respect to) all material  federal,  state and
local tax returns which are required to be filed and has paid in full or accrued
all  material  federal,  state  and  local  taxes,  estimated  taxes,  interest,
penalties,  assessments  and  deficiencies  assessed  in  connection  with  such
returns.  Neither ONS nor any  Subsidiary  is a party to any  pending  action or
proceeding,  and to the  knowledge  of ONS  there  is no  action  or  proceeding
threatened, by any governmental authority for assessment or collection of taxes,
and no unresolved  claim for assessment or collection of taxes has been asserted
against ONS or any Subsidiary, which would have a Material Adverse Effect.


            7.9.  SUBSIDIARIES

                  Schedule 7.9 hereto sets forth the name of each Subsidiary and
ONS' ownership in such entity. Each Subsidiary is a corporation, or partnership,
duly  organized,  validly  existing and in good  standing  under the laws of its
state of incorporation  or  organization,  and each has the full corporate power
and  authority  to carry on its  business  as it is now  being  conducted.  Each
Subsidiary is qualified 

                                       20
<PAGE>

in every  jurisdiction  in which the failure to so qualify would have a Material
Adverse Effect.


            7.10. BOOKS AND RECORDS

                  The books of account,  stock  record,  minute  books and other
records of ONS and its Subsidiaries have been maintained in accordance with good
business  practices,  and the matters  contained  therein are  appropriately and
accurately reflected in the Current Financial Statements.


            7.11. LITIGATION

                  Except as set forth in the  Disclosure  Materials and Schedule
7.11 regarding the Skydata matter, there are no material claims, actions, suits,
proceedings or investigations pending or, to the knowledge of ONS, threatened or
anticipated  against,  affecting  or  involving  ONS  or any  Subsidiary  or the
transactions  contemplated by this Agreement, at law or in equity, or before any
court,  arbitrator or governmental authority,  domestic or foreign.  Neither ONS
nor any Subsidiary is operating under,  subject to or in default with respect to
any  order,  judgment,   injunction  or  decree  of  any  court,  arbitrator  or
governmental  authority,  domestic or foreign that would have a Material Adverse
Effect, except for orders of the Federal Communications Commission pertaining to
the authority of ONS to conduct its operations,  and with respect to such orders
ONS is in full compliance.


            7.12. SEC FILINGS

                  Since  August 1,  1995,  all  reports,  proxy  statements  and
registration statements required to be filed by ONS with the SEC pursuant to the
Securities  Act, and the  Securities  and Exchange Act of 1934,  as amended (the
"1934  Act"),  have been timely  filed with the SEC and complied in all material
respects with the requirements of the Securities Act, the 1934 Act and the rules
and regulations under the Securities Act and 1934 Act, and none of such reports,
proxy  statements or registration  statements  contained as of their  respective
dates any untrue  statement  of a  material  fact or omitted to state a material
fact required to be stated  therein or necessary in order to make the statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.  In addition,  the Merger Proxy  Statement  insofar as it relates to
ONS,  as of the date of  mailing  of the Merger  Proxy  Statement  by ONS to its
stockholders  and as of the date of the ONS  stockholders  meeting to which such
Merger Proxy Statement  relates,  (i) will comply in all material  respects with
the provisions of the 1934 Act and the rules and regulations thereunder and (ii)
except  with  respect to any  information  relating to the  Exchanging  Partners
provided to ONS by the Exchanging  Partners in writing  specifically  for use in
the Merger Proxy  Statement,  will not contain an untrue statement of a material
fact or omit to state a material fact required to be stated 

                                       21

<PAGE>

therein  or  necessary  to  make  the  statements   therein,  in  light  of  the
circumstances under which they were made, not misleading.


            7.13. TRANSACTIONS WITH EXCHANGING PARTNERS

                  Neither ONS nor any of its Affiliates  currently is a party to
any  transaction  or  agreement  with any of the  Exchanging  Partners  or their
Affiliates  relating  to  the  Exchange,  other  than  this  Agreement  and  the
agreements  contemplated  hereby,  that  has not been  disclosed  to each of the
Exchanging Partners or otherwise publicly disclosed by ONS.


            7.14. ABSENCE OF VIOLATIONS

                  Neither ONS nor any of its  Subsidiaries  is in default under,
nor has it breached,  any material term or material provision of its Certificate
of Incorporation or By-laws or any Material  Contract.  ONS and its Subsidiaries
have complied with and are in full compliance  with all Laws,  where the failure
to so comply would have a Material Adverse Effect.


8.                RESTRICTED SECURITIES

                  Each Exchanging Partner hereby severally represents,  warrants
and covenants to ONS as follows:


            8.1.  NO REGISTRATION UNDER THE SECURITIES ACT

                  Such Exchanging  Partner  understands that the Newco Preferred
Stock to be  acquired by it under this  Agreement,  and the Newco  Common  Stock
issuable  upon  the  conversion  thereof,  have not been  registered  under  the
Securities Act, in reliance upon  exemptions  contained in the Securities Act or
interpretations  thereof,  and cannot be  offered  for sale,  sold or  otherwise
transferred  unless  subsequently  so registered  or qualify for exemption  from
registration  under the Securities Act. The Newco Preferred Stock, and the Newco
Common Stock issuable upon the conversion thereof, will not be offered for sale,
sold  or  otherwise  transferred  by  such  Exchanging  Partner  without  either
registration or exemption from registration under the Securities Act.


            8.2.  ACQUISITION FOR INVESTMENT

                  The Newco  Preferred Stock being acquired under this Agreement
by such  Exchanging  Partner is being  acquired  in good  faith  solely for such
Exchanging  Partner's  own account,  for  investment  and not with a view toward
distribution  within the meaning of the Securities Act. Such Exchanging  Partner
has, and at the time of Closing such  Exchanging  Partner will have,  no present
plan or  intention  to 

                                       22
<PAGE>

sell or otherwise dispose of the Newco Preferred Stock being acquired under this
Agreement or any Newco Common Stock  issuable upon the  conversion of such Newco
Preferred Stock;  provided,  however,  that such Exchanging  Partner may decide,
from time to time,  to sell some or all of such stock based upon a change in the
investment  policy of such Exchanging  Partner and provided  further,  that this
provision  shall not restrict MCN Sat from  transferring  a portion of its Newco
Preferred Stock to BAe.


            8.3.  EVALUATION OF MERITS AND RISKS OF INVESTMENT

                  Such  Exchanging  Partner has such knowledge and experience in
financial  and  business  matters  that such  Exchanging  Partner  is capable of
evaluating the merits and risks of its investment in the Newco  Preferred  Stock
being acquired  hereunder.  Such Exchanging  Partner  understands and is able to
bear any economic risks  associated  with such  investment  (including,  without
limitation, the necessity of holding the Newco Preferred Stock for an indefinite
period of time,  inasmuch as the Newco  Preferred Stock have not been registered
under the Securities Act).


            8.4.  REVIEW OF DOCUMENTS

                  Such  Exchanging  Partner  and  its  advisers,  if  any,  have
received,  and  have had a  reasonable  opportunity  to  review,  the  following
documents (collectively,  the "Disclosure Materials"): (i) Annual Report on Form
10-K for ONS for the fiscal year ended December 31, 1995; (ii) Quarterly  Report
on Form 10-Q for ONS for the fiscal  quarter  ended March 31, 1996;  (iii) Proxy
Statement of ONS relating to the Annual  Meeting of  Stockholders  to be held on
May 23, 1996; and (iv) Risk Factors Relating to Orion and Description of Capital
Stock of Orion.


            8.5.  OPPORTUNITY TO REQUEST INFORMATION

                  Such Exchanging  Partner and its advisers,  if any, have had a
reasonable  opportunity to ask questions of and receive  information and answers
from a person or persons  acting on behalf of ONS  concerning  the  transactions
contemplated by this Agreement and all such questions have been answered and all
such information has been provided to their full satisfaction. If this Agreement
is not  terminated on or before the Newco  Finalization  Date,  such  Exchanging
Partner and its advisers,  if any, as of the Newco  Finalization Date, will have
had a reasonable  opportunity  to ask questions of and receive  information  and
answers  from a person or  persons  acting on  behalf  of Newco  concerning  the
transactions  contemplated  by this  Agreement and all such  questions will have
been  answered and all such  information  will have been  provided to their full
satisfaction.  In making  their  investment,  the  Exchanging  Partners  will be
relying  solely on their  review of the  Disclosure  Materials  (other  than any
projections   included   therein,   

                                       23

<PAGE>

which are not being relied upon), the  representations  and warranties set forth
herein,  the  Newco  Formation  Documents  and  the  Merger  Documents,  and the
documents made available for inspection and the answers to questions referred to
in this Section 8.5.


9.                CONDITIONS PRECEDENT TO OBLIGATIONS OF THE EXCHANGING PARTNERS

                  The  obligations  of each of the  Exchanging  Partners (and of
Lockheed  Martin,  in the case of the  condition  in  Section  9.8)  under  this
Agreement are subject to the fulfillment, at or prior to the Closing, of each of
the following conditions (other than those in Section 9.8, which are a condition
only to the  obligations  of Lockheed  Martin),  and failure to satisfy any such
condition  shall excuse and discharge all  obligations of each of the Exchanging
Partners  (and of Lockheed  Martin only, in the case of failure of the condition
in Section  9.8) to carry out the  provisions  of this  Agreement,  unless  such
failure  is agreed to in  writing  by each of the  Exchanging  Partners  (and of
Lockheed Martin only, in the case of the condition in Section 9.8):


            9.1.  REPRESENTATIONS AND WARRANTIES

                  The  representations  and  warranties  made  by  ONS  in  this
Agreement shall be true and complete in all material  respects when made, and on
and as of the Closing Date as though such  representations  and warranties  were
made on and as of such date.


            9.2.  PERFORMANCE

                  ONS and  OrionSat  shall have  performed  and  complied in all
material  respects with all agreements and covenants  required by this Agreement
to be performed  or complied  with by ONS and/or  OrionSat  prior to the Closing
Date.


            9.3.  DOCUMENTS AT CLOSING

                  All  documents  required  to be  furnished  by Newco,  ONS and
OrionSat to the  Exchanging  Partners prior to or at the Closing shall have been
so furnished.


            9.4.  REFINANCING  OF  CREDIT  FACILITY,  CANCELLATION  OF  CAPACITY
                  AGREEMENTS

                  The  Credit  Facility   Refinancing  and  Capacity   Agreement
Termination  shall have been  completed,  other than any  actions to be taken by
such  Exchanging  Partner,  and the documents  effecting the Capacity  Agreement
Termination  shall be substantially in the form of Exhibit H hereto or otherwise
in form  and  substance  

                                       24

<PAGE>

reasonably  satisfactory to each Exchanging Partner.  Evidence of the completion
of the Capacity Agreement  Termination and Credit Facility  Refinancing shall be
the execution of Exhibit H by Chase and the  unconditional  delivery of the same
at Closing.


            9.5.  CONSENTS

                  ONS and OrionSat  shall have  received all material  consents,
authorizations  and  approvals of  governmental,  supragovernmental  and private
parties  listed on  Schedule  7.3 which are  required to be obtained in order to
consummate the transactions contemplated hereby.


            9.6.  REGISTRATION

                  The Registration Rights Agreement shall have been executed and
delivered by Newco.


            9.7.  SATELLITE CONTRACT

                  ONS or  one  of  its  affiliates  shall  have  entered  into a
satellite  procurement  contract (the "Orion 2 Satellite  Contract")  with Matra
Marconi  Space  or  an  affiliate   thereof  ("Matra  Marconi  Space")  for  the
construction  and  launch of Orion 2, ONS or one of its  affiliates  shall  have
given Matra  Marconi  Space notice to proceed  under such contract and Amendment
No. 10 between Matra Marconi Space and Orion  Atlantic to the Second Amended and
Restated  Contract,  dated  September  26,  1991,  as amended  shall have become
effective and Orion  Atlantic  shall not be in default under such  Amendment No.
10.


            9.8.  LAUNCH SUB CONTRACT

                  Lockheed  Martin and Matra  Marconi  Space shall have  entered
into a subcontract to the Orion 2 Satellite  Contract  relating to the launch of
Orion 2.


            9.9.  NEWCO FORMATION

                  The Newco  Formation  Documents  shall be consistent  with the
requirement  that Newco be substantially  identical in all material  respects to
ONS, or any  discrepancies  shall be  reasonably  acceptable  to the  Exchanging
Partners  (provided,  however,  that such condition shall be deemed to have been
satisfied,  and shall terminate,  and be of no further force and effect, if this
Agreement  shall not have been  terminated  on or before the Newco  Finalization
Date); and the Newco Formation shall have occurred in accordance with Section 2.

                                       25

<PAGE>


            9.10. MERGER

                  The Merger shall have  occurred,  or shall occur  concurrently
with the Closing, in accordance with Section 4.


            9.11. TAX OPINION

                  The  Exchanging  Partners  shall have received an opinion from
Ernst & Young,  L.L.P., tax advisors to Newco, in form and substance  reasonably
satisfactory to the Exchanging  Partners,  dated the Closing Date, which opinion
may be based on appropriate  representations  of the parties hereto, in form and
substance reasonably  satisfactory to such tax advisors,  to the effect that the
Merger and the Exchange,  taken together,  will be a tax-free exchange described
in Code Section 351(a).


10.               CONDITIONS PRECEDENT TO OBLIGATIONS OF ONS AND ORIONSAT

                  The  obligations  of ONS and OrionSat under this Agreement are
subject to the fulfillment, at or prior to the Closing, of each of the following
conditions, and failure to satisfy any such condition shall excuse and discharge
all  obligations  of ONS  and  OrionSat  to  carry  out the  provisions  of this
Agreement, unless such failure is agreed to in writing by ONS and OrionSat:


            10.1. REPRESENTATIONS AND WARRANTIES

                  The  representations  and  warranties  made by the  Exchanging
Partners in this Agreement  shall be true and complete in all material  respects
when made, and on and as of the Closing Date as though such  representations and
warranties  were made on and as of such date,  except for any changes  expressly
permitted by this Agreement.


            10.2. PERFORMANCE

                  The Exchanging Partners shall have performed and complied with
all material agreements and covenants required by this Agreement to be performed
or complied with prior to the Closing Date.


            10.3. DOCUMENTS AT CLOSING

                  All  documents  required  to be  furnished  by the  Exchanging
Partners  to ONS and  OrionSat  prior to or at the  Closing  shall  have been so
furnished.

                                       26

<PAGE>


            10.4. CONSENTS

                  The  Exchanging  Partners  shall have  received  all  material
consents,  authorizations and approvals of governmental,  supragovernmental  and
private  parties  which are required to be obtained in order to  consummate  the
transactions contemplated hereby.


            10.5. REFINANCING  OF  CREDIT  FACILITY,  CANCELLATION  OF  CAPACITY
                  AGREEMENTS

                  The Credit Facility  Refinancing,  Bank Agreement  Termination
and Capacity  Agreement  Termination  shall have been completed,  other than any
actions to be taken by ONS and OrionSat.


            10.6. PARTNERSHIP AGREEMENT AMENDMENT

                  The   Partnership   Agreement   shall  have  been  amended  as
contemplated  by Section  5.4,  other than due to any actions to be taken by ONS
and OrionSat.


            10.7. CONSENTS OF THE ONS STOCKHOLDERS

                  The ONS Stockholder  Consent has been obtained for the Merger,
the Exchange and any related transactions requiring stockholder consent.


            10.8. COMPLETION OF FINANCING FOR A SECOND SATELLITE

                  Newco shall have raised at least $100 million from the sale of
Convertible Subordinated  Debentures,  not including any amounts representing or
in  satisfaction  of any amounts due by ONS or Orion  Atlantic to any Exchanging
Partner or Affiliate thereof,  and BAe shall have purchased at least $50 million
of Convertible Subordinated Debentures from Newco.


            10.9. SATELLITE CONTRACT

                  ONS or one of its affiliates shall have entered into the Orion
2 Satellite Contract with Matra Marconi Space for the construction and launch of
Orion 2.


            10.10. NEWCO FORMATION

                  The Newco  Formation  shall have occurred in  accordance  with
Section 2.

                                       27
<PAGE>


            10.11. MERGER

                  The Merger shall have occurred,  or be occurring  concurrently
with the  Closing,  in  accordance  with Section 4; and no ONS  stockholder  (or
former stockholder of ONS, if the Merger already shall have occurred) shall have
delivered   to  ONS  a  written   notice  of  such   stockholder's   (or  former
stockholder's) intention, or otherwise indicated an intention, to dissent to the
Merger or otherwise seek to exercise any right to sell to ONS, or obtain payment
from ONS  for,  such  stockholder's  stock  in ONS in lieu of such  stock  being
converted in the Merger to stock of Newco.


11.         CLOSING


            11.1. CLOSINGS

                  (a)      Deposit into Escrow

                  Simultaneously  with execution and delivery of this Agreement,
the  Exchanging  Partners  are  entering  into an Escrow  Agreement  in the form
attached as Exhibit J and  depositing  into escrow with one counsel  selected by
the Exchanging  Partners (which may be counsel  representing  one or more of the
Exchanging  Partners  in other  capacities),  acting as escrow  agent,  executed
copies of each of the  documents to be delivered by the  Exchanging  Partners to
Newco,  ONS or OrionSat at the  Closing.  Each of the parties  hereto  agrees to
abide by the terms of such Escrow Agreement.

                  (b)      Closing

                  Subject to the terms and  conditions  of this  Agreement,  the
Closing  shall  take  place  at the  offices  of  Hogan &  Hartson  L.L.P.,  555
Thirteenth Street, N.W., Washington, D.C. 20004 on the Closing Date.


            11.2. DELIVERIES BY THE EXCHANGING PARTNERS

                  At or prior to the  Closing,  the  Exchanging  Partners  shall
deliver to Newco, ONS or OrionSat, as applicable, the following:

                  (a)  documents  of  transfer  of  partnership   interests  and
substitution  of  limited  partners  with  respect  to  the LP  Interests  being
transferred to Newco pursuant to Section 0, in the form attached as Exhibit F;

                  (b) documents transferring the rights included in the Other LP
Rights, in the form attached as Exhibit G.

                                       28

<PAGE>

                  (c) counterparts to the Third Amended and Restated Partnership
Agreement duly executed by each of the Exchanging Partners;

                  (d) a certified copy of the  resolutions  adopted by the Board
of Directors of each of the Exchanging  Partners  authorizing  the  transactions
contemplated by this Agreement; and

                  (e)  such  other  documents  as  Newco,  ONS or  OrionSat  may
reasonably request, including without limitation certificates of the officers of
the Exchanging Partners as to the matters set forth in Sections 10.1 and 10.2.


            11.3. DELIVERIES BY ONS AND NEWCO

                  At or  prior  to  the  Closing,  Newco,  ONS or  OrionSat,  as
applicable, shall deliver to the Exchanging Partners the following:

                  (a) certificates  representing the Newco Preferred Stock being
issued to the Exchanging Partners pursuant to Section 2;

                  (b) the Registration Rights Agreement, duly executed by Newco;

                  (c) evidence in the form of the documents  included as Exhibit
H hereto,  duly  executed  and  delivered  by all  parties  thereto  other  than
Exchanging Partners,  that the Capacity Termination  Agreement has been effected
and that the Capacity Guarantees have been terminated in their entirety;

                  (d) a certified copy of the resolutions  adopted by the Boards
of  Directors  of  Newco,   ONS  and  OrionSat   authorizing  the   transactions
contemplated by this Agreement;

                  (e)      evidence of receipt of the ONS Stockholder Consent;

                  (f) good  standing  certificates  as of a date  not more  than
fifteen days prior to the Closing  Date issued by the  Secretary of State of the
State of Delaware with respect to Newco, ONS and OrionSat;

                  (g)  opinion(s) of counsel to Newco and ONS, dated the Closing
Date and addressed to the Exchanging  Partners,  substantially to the effect set
forth on Exhibit I;

                  (h) an  agreement  by  Newco  to be  bound  by  the  indemnity
provisions of Section 12 (the "Newco Indemnity"); and

                  (i)  such  other  documents  as the  Exchanging  Partners  may
reasonably request, including without limitation certificates of the officers of
Newco and ONS as to the matters set forth in Sections 9.1 and 9.2.

                                       29

<PAGE>

            11.4. ORDER OF EFFECTIVENESS

                  Of the documents being delivered by the Exchanging Partners at
the Closing,  the  counterparts  to the Third  Amended and Restated  Partnership
Agreement  duly  executed  by each of the  Exchanging  Partners  shall be deemed
delivered  first,  and upon  signature by ONS and OrionSat the Third Amended and
Restated  Partnership  Agreement shall be deemed in full force and effect, prior
to  delivery of the (i)  documents  of transfer  of  partnership  interests  and
substitution  of  limited  partners  with  respect  to  the LP  Interests  being
transferred  to Newco  pursuant to Section 2, in the form attached as Exhibit F,
and (ii) documents  transferring the rights included in the Other LP Rights,  in
the form attached as Exhibit G.


12.         SURVIVAL OF REPRESENTATIONS; INDEMNIFICATION; REMEDIES


            12.1. SURVIVAL OF REPRESENTATIONS

                  All representations,  warranties,  covenants,  indemnities and
other  agreements made by any party to this Agreement  herein or pursuant hereto
shall  also  be  deemed  made  on and as of the  Closing  Date  as  though  such
representations,  warranties,  covenants,  indemnities and other agreements were
made  on  and  as of  such  date,  and  all  such  representations,  warranties,
covenants,  indemnities and other  agreements  shall survive the Closing and any
investigation, audit or inspection at any time made by or on behalf of any party
hereto, including the review of the Disclosure Materials under Section 8.4.


            12.2. AGREEMENT OF NEWCO, ONS AND ORIONSAT TO INDEMNIFY

                  Subject to the conditions and provisions of this Section 12.2,
ONS and OrionSat  jointly and severally shall (and Newco shall,  pursuant to the
Newco Indemnity) jointly and severally indemnify,  defend and hold harmless each
of the EP  Indemnified  Persons  from and after the Closing  Date against and in
respect of all Claims asserted  against,  resulting to, imposed upon or incurred
by any of the EP  Indemnified  Persons  (whether such Claims are by,  against or
relate  to  Newco,  ONS or  OrionSat  or any  other  party,  including,  without
limitation,  a governmental  entity),  directly or  indirectly,  by reason of or
resulting from any of the following:

                  (i) any of the  matters  with  respect  to which they would be
obligated to indemnify the EP Indemnified  Persons under Section  7.09(e) of the
Partnership  Agreement  and  which  arose  before  or after  the  Closing  Date,
notwithstanding  the Exchanging Partners ceasing to be limited partners of Orion
Atlantic as of the Closing Date; or

                                       30

<PAGE>

                  (ii) any  Claims  asserted  by one or more of the  Lenders  or
Chase, or their  successors or assigns,  arising from and after the Closing Date
under (A) any of the Capacity  Agreements,  Contingent  Capacity  Agreements  or
Capacity  Guarantees  which are  terminated on or prior to the Closing Date, (B)
any agreements or other  documents  terminated or to be terminated in connection
with  the  Bank  Agreement  Termination,  or (C) this  Agreement,  in each  case
excluding   any  Claims   arising   from  or  relating  to  any  breach  of  any
representation  or  warranty,  or  noncompliance  with any  conditions  or other
agreements,  given  or  made  by  any EP  Indemnified  Person  under  any of the
agreements  or  documents  referred to above in this  paragraph  or any document
furnished by or on behalf of any EP Indemnified Person pursuant thereto.


            12.3. CONDITIONS OF INDEMNIFICATION.

                  The  obligations  and  liabilities of Newco,  ONS and OrionSat
with respect to their respective indemnities pursuant to the Newco Indemnity and
Section 12.2, resulting from any Claims, shall be subject to the following terms
and conditions:

                  12.3.1.  The party seeking  indemnification  (the "Indemnified
Party")  must  give  the  other  party  or  parties,  as the  case  may be  (the
"Indemnifying Party"),  notice of any such Claims promptly after the Indemnified
Party  receives  notice  thereof;  provided that the failure to give such notice
shall not affect the rights of the  Indemnified  Party  hereunder  except to the
extent that the  Indemnifying  Party shall have suffered actual damage by reason
of such failure.

                  12.3.2.  The  Indemnifying  Party  shall  have  the  right  to
undertake,  by counsel or other representatives of its own choosing, the defense
of such Claims at the Indemnifying Party's risk and expense.

                  12.3.3.  In the event that the Indemnifying  Party shall elect
not to undertake  such defense,  or, within a reasonable  time after notice from
the Indemnified Party of any such Claims,  shall fail to defend, the Indemnified
Party (upon further  written  notice to the  Indemnifying  Party) shall have the
right to undertake the defense,  compromise  or  settlement  of such Claims,  by
counsel or other  representatives of its own choosing,  on behalf of and for the
account  and  risk  of the  Indemnifying  Party  (subject  to the  right  of the
Indemnifying  Party to  assume  defense  of such  Claims  at any  time  prior to
settlement,  compromise  or final  determination  thereof).  In such event,  the
Indemnifying  Party shall pay to the Indemnified Party, in addition to the other
sums  required  to be paid  hereunder,  the costs and  expenses  incurred by the
Indemnified  Party in connection with such defense,  compromise or settlement as
and when such costs and expenses are so incurred.

                                       31
  

<PAGE>

                12.3.4.   Anything  in  this  Section  12.3  to  the  contrary
notwithstanding,  (a) if there  is a  reasonable  probability  that  Claims  may
materially and adversely affect the Indemnified  Party other than as a result of
money  damages or other money  payments,  the  Indemnified  Party shall have the
right, at its own cost and expense, to participate in the defense, compromise or
settlement  of the Claims,  (b) the  Indemnifying  Party shall not,  without the
Indemnified Party's written consent,  settle or compromise any Claims or consent
to entry of any judgment which does not include as an unconditional term thereof
the  giving by the  claimant  or the  plaintiff  to the  Indemnified  Party of a
release  from all  liability  in  respect of such  Claims in form and  substance
satisfactory  to  the  Indemnified   Party,  and  (c)  in  the  event  that  the
Indemnifying  Party undertakes  defense of any Claims, the Indemnified Party, by
counsel or other  representative  of its own  choosing  and at its sole cost and
expense,  shall have the right to consult  with the  Indemnifying  Party and its
counsel or other  representatives  concerning  such Claims and the  Indemnifying
Party  and  the  Indemnified  Party  and  their  respective   counsel  or  other
representatives shall cooperate with respect to such Claims and (d) in the event
that the Indemnifying  Party undertakes  defense of any Claims, the Indemnifying
Party shall have an obligation  to keep the  Indemnified  Party  informed of the
status of the defense of such Claims and furnish the Indemnified  Party with all
documents,   instruments  and  information  that  the  Indemnified  party  shall
reasonably request in connection therewith.


            12.4. SPECIFIC PERFORMANCE; NO CONSEQUENTIAL DAMAGES

                  In addition to any other remedies which the parties hereto may
have at law or in equity,  the parties  hereto  hereby  acknowledge  that the LP
Interests,  the Other LP Rights and the Newco  Preferred  Stock are unique,  and
that the harm to Newco, ONS and OrionSat,  and the Exchanging Partners resulting
from breaches by the other  parties of their  respective  obligations  cannot be
adequately  compensated by damages.  Accordingly,  the parties hereto agree that
each  party  shall  have  the  right  to  have  all  obligations,  undertakings,
agreements,  covenants  and  other  provisions  of this  Agreement  specifically
performed by the other parties, and that the parties hereto 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.
Notwithstanding  any other  provision of this  Agreement to the contrary,  in no
event shall remedies for breach of this Agreement  include a party's  incidental
or consequential damages.


13.         TERMINATION


            13.1. TERMINATION

                  This  Agreement  may be  terminated  at any  time  before  the
Closing Date under any one or more of the following circumstances:

                                       32

<PAGE>

                  (a)  by  the mutual written consent of the parties hereto;  or

                  (b)  by  ONS  and  OrionSat  or  by  the  Exchanging  Partners
collectively  or (as to a particular  Exchanging  Partner),  by such  Exchanging
Partner,  by written notice of termination to the other parties  hereto,  if the
Closing has not  occurred  by January  30,  1997;  provided,  however,  that the
terminating  party is not in breach of any  obligations or agreements  hereunder
that are causing any of the conditions precedent to Closing not to be satisfied.

                  In addition,  following  circulation  by ONS to the Exchanging
Partners of the finalized and  implemented  Newco  Formation  Documents,  if the
finalized and implemented Newco Formation  Documents are not consistent with the
requirement  that Newco be substantially  identical in all material  respects to
ONS, and any  discrepancies  are not  reasonably  acceptable to such  Exchanging
Partner(s),  then this  Agreement may be terminated at any time on or before the
Newco  Finalization  Date by the Exchanging  Partners  collectively  or (as to a
particular Exchanging Partner), by such Exchanging Partner, by written notice of
termination  to the other  parties  hereto on or before the close of business on
the Newco Finalization Date.


            13.2. EFFECT OF TERMINATION

                  In the event this  Agreement is terminated as provided in this
Section  13  (other  than as to less  than all the  Exchanging  Partners),  this
Agreement shall forthwith  become wholly void and of no effect,  and the parties
shall be released from all future obligations hereunder; provided, however, that
the  obligations of the Exchanging  Partners as to  confidentiality  provided in
Section  5.6,  and the  provisions  of Section  14.3  relating to the payment of
expenses,  shall  not  be  extinguished  but  shall  survive  such  termination;
provided, further, however, that no party shall be relieved from its liabilities
for breach of  representations,  warranties,  obligations or agreements prior to
termination  of this  Agreement.  The  parties  hereto  shall  have  any and all
remedies to enforce such  obligations  provided at law or in equity  (including,
without limitation, specific performance).


14.         MISCELLANEOUS


            14.1. ADDITIONAL ACTIONS AND DOCUMENTS

                  Each of the parties  hereto  hereby agrees to take or cause to
be taken such  further  actions,  to  execute,  deliver  and file or cause to be
executed,  delivered  and filed such  further  documents,  and will  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.

                                       33

<PAGE>


            14.2. BROKER'S FEES OR LIABILITIES

                  The fees and  expenses of Salomon  Brothers  shall be borne by
ONS. Except for such fees and expenses,  each party agrees to indemnify,  defend
and hold  harmless each of the other parties from and against any and all claims
asserted against such parties for any unpaid liability to any broker,  finder or
agent for any brokerage fees, finders' fees or commissions,  with respect to the
transactions contemplated by this Agreement.


            14.3. EXPENSES

                  Subject to the  provisions of Section 14.2,  each party hereto
shall pay its own  expenses  incident  to this  Agreement  and the  transactions
contemplated hereunder.


            14.4. ASSIGNMENT

                  The  Exchanging  Partners shall have the right to assign their
respective  rights  under the  Agreement,  in whole or in part,  to any of their
respective  Affiliates  or to designate  any of their  respective  Affiliates to
receive  directly the Newco  Preferred  Stock to be acquired  hereunder (in each
case,  to the extent  permitted  by  applicable  law).  ONS,  OrionSat and Orion
Atlantic  shall have the right to assign their rights  under the  Agreement,  in
whole or in part, to any of their respective Affiliates (to the extent permitted
by applicable  law). In no event shall the assignment by ONS,  OrionSat,  or any
Exchanging Partner of its respective rights under this Agreement, whether before
or after the Closing,  release ONS, OrionSat, or any Exchanging Partner from its
respective liabilities and obligations hereunder.


            14.5. ENTIRE AGREEMENT; AMENDMENT

                  This  Agreement,  including the Schedules,  Exhibits and other
documents  referred to herein or furnished pursuant hereto constitute the entire
agreement among the parties hereto with respect to the transactions contemplated
herein  and  therein,  and  supersede  all  prior  oral or  written  agreements,
commitments or  understandings  with respect to the matters  provided for herein
and therein.  No amendment or  modification  of this Agreement shall be valid or
binding unless set forth in writing and duly executed and delivered by the party
against whom enforcement of the amendment or modification is sought.


            14.6. WAIVER

                  No  delay  or  failure  on the  part of any  party  hereto  in
exercising any right, power or privilege under this Agreement or under any other
documents  

                                       34


<PAGE>

furnished in connection with or pursuant to this Agreement shall impair any such
right,  power or  privilege  or be  construed  as a waiver of any default or any
acquiescence  therein. No single or partial exercise of any such right, power or
privilege shall preclude the further exercise of such right, power or privilege,
or the exercise of any other right, power or privilege. No waiver shall be valid
against any party hereto  unless made in writing and signed by the party against
whom  enforcement of such waiver is sought and then only to the extent expressly
specified therein.


            14.7. CONSENT TO JURISDICTION

                  This  Agreement  and  the  duties  and   obligations  of  ONS,
OrionSat,  the  Exchanging  Partners  hereunder  and under each of the documents
referred to herein shall be enforceable against any of ONS, OrionSat,  or one or
more of the Exchanging Partners, as the case may be, in the courts of the United
States  and of the States of  Maryland  and  Delaware.  For such  purpose,  ONS,
OrionSat and each of the Exchanging  Partners hereby  irrevocably  submit to the
non-exclusive jurisdiction of such courts, and agrees that all claims in respect
of this Agreement and such other documents may be heard and determined in any of
such courts.


            14.8. SEVERABILITY

                  If any part of any  provision  of this  Agreement or any other
agreement or document  given  pursuant to or in connection  with this  Agreement
shall be invalid or unenforceable in any respect, such part shall be ineffective
to the extent of such invalidity or  unenforceability  only,  without in any way
affecting the remaining  parts of such provision or the remaining  provisions of
this Agreement.


            14.9. 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  (excluding  the
choice of law rules thereof).


            14.10. NOTICES

                  All notices, demands,  requests, or other communications which
may be or are  required to be given,  served,  or sent by any party to any other
party  pursuant  to  this  Agreement  shall  be in  writing  and  shall  be hand
delivered,  sent by overnight  courier or mailed by  first-class,  registered or
certified mail,  return receipt  requested,  postage prepaid,  or transmitted by
telegram, telecopy or telex, addressed as follows:

                                       35

<PAGE>

                  (i)      If to Orion Atlantic, ONS or OrionSat:

                           2440 Research Boulevard
                           Suite 400
                           Rockville, Maryland  20817
                           Attn:  Richard H. Shay, Esq.

                  (ii)     If to the Exchanging Partners, to each of the
                           following who is an Exchanging Partner:

                           British Aerospace
                              Holding, Inc.
                           22070 Broderick Drive
                           Sterling, Virginia  20166
                           Attn:  Charles Gaba


                           COM DEV Satellite
                               Communications Limited
                           155 Sheldon Drive
                           Cambridge, Ontario
                           Canada N1R 7H6
                           Attn:  David Belbeck


                           Kingston Communications
                              International Limited
                           Telephone House
                           Carr Lane
                           Kingston-upon-Hull
                           HU1 3RE   England
                           Attn:  John Bailey


                           Lockheed Martin Commercial
                              Launch Services, Inc.
                           Attention:  Chester Wheeler
                           Lockheed Martin Commercial
                              Launch Services, Inc.
                           P.O. Box 179
                           MSM DC-1400
                           Denver, Colorado  80201-0179

                                       36

<PAGE>

                           MCN Sat US, Inc.
                           37, Avenue Louis Breguet B.P.1
                           78146 Velizy Villacoublay Cedex
                           France
                           Attn:  Claude Goumy


                           Trans-Atlantic Satellite, Inc.
                           1211 Avenue of the Americas
                           41st Floor
                           New York, NY  10036
                           Attn:  Ken Mori


Each party 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 hand delivered,
sent,  mailed,  telecopied or telexed in the manner  described  above,  or which
shall be delivered to a telegraph company,  shall be deemed  sufficiently given,
served,  sent,  received  or  delivered  for all  purposes at such time as it is
delivered to the addressee (with the return receipt,  the delivery  receipt,  or
(with respect to a telecopy or telex) the  answerback  being deemed  conclusive,
but not  exclusive,  evidence of such  delivery)  or at such time as delivery is
refused by the addressee upon presentation.


            14.11. HEADINGS

                  Section 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.


            14.12. EXECUTION IN COUNTERPARTS

                  To facilitate execution,  this Agreement may be executed in as
many  counterparts  as may be  required.  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.

                                       37

<PAGE>


            14.13. LIMITATION ON BENEFITS

                  The covenants,  undertakings  and agreements set forth in this
Agreement shall be solely for the benefit of, and shall be enforceable  only by,
the  parties  hereto  and  their  respective   successors,   heirs,   executors,
administrators, legal representatives and permitted assigns, except that (i) the
agreements  set  forth in  Section  10 also  shall be for the  benefit  of,  and
enforceable by, EP Indemnified Persons and their respective  successors,  heirs,
executors,  administrators, legal representatives or permitted assigns, and (ii)
agreements  relating to Affiliates of the Exchanging  Partners named or referred
to specifically  herein also shall be for the benefit of, enforceable by and (to
the extent  permitted  by law)  enforceable  against such  Affiliates  and their
respective successors, heirs, executors,  administrators,  legal representatives
or permitted assigns.


            14.14. BINDING EFFECT

                  Subject to any provisions hereof restricting assignment,  this
Agreement  shall be binding  upon and shall  inure to the benefit of the parties
hereto and their respective successors, heirs, executors,  administrators, legal
representatives and assigns.

                                       38

<PAGE>



                  IN WITNESS WHEREOF, the parties hereto have duly executed this
Agreement, or have caused this Agreement to be duly executed on their behalf, as
of the day and year first above written.

                            INTERNATIONAL PRIVATE SATELLITE PARTNERS, L.P.

                                            By: Orion Satellite Corporation, its
                                                general partner

                                            By:
                                                --------------------------------
                                            Title:
                                                  ------------------------------



                                            ORION NETWORK SYSTEMS, INC.

                                            By:
                                                --------------------------------
                                            Title:
                                                  ------------------------------



                                            ORION SATELLITE CORPORATION

                                            By:
                                                --------------------------------
                                            Title:
                                                  ------------------------------



                                       39

<PAGE>



                                            BRITISH AEROSPACE 
                                            COMMUNICATIONS, INC.


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

Date:                                       Title:
     ---------------------------------            ------------------------------



                                            COM DEV SATELLITE 
                                            COMMUNICATIONS LIMITED


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

Date:                                       Title:
     ---------------------------------            ------------------------------



                                            KINGSTON COMMUNICATIONS 
                                            INTERNATIONAL LIMITED


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

Date:                                       Title:
     ---------------------------------            ------------------------------


                                            LOCKHEED MARTIN 
                                            COMMERCIAL LAUNCH 
                                            SERVICES, INC.


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

Date:                                       Title:
     ---------------------------------            ------------------------------



                                            MCN SAT US, INC.


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

Date:                                       Title:
     ---------------------------------            ------------------------------

                                       40

<PAGE>


                                            TRANS-ATLANTIC SATELLITE, 
                                            INC.


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

Date:                                       Title:
     ---------------------------------            ------------------------------















                                       41

<PAGE>

                                                                       EXHIBIT A
                                                                       ---------

                                   DEFINITIONS

                  "Affiliate" means: (a) with respect to a person, any member of
such  person's  family;  (b) with respect to an entity,  any officer,  director,
stockholder,  partner or investor of or in such entity or of or in any Affiliate
of such entity; and (c) with respect to a person or entity, any person or entity
which directly or indirectly,  through one or more intermediaries,  Controls, is
Controlled by, or is under common Control with such person or entity.

                  "Agreement"  means the Exchange  Agreement,  including each of
the Schedules and Exhibits hereto.

                  "Agreement  of  Principles"  means the Agreement of Principles
dated  as of  April  2,  1992,  among  Orion  Atlantic,  OrionSat,  ONS  and the
Exchanging Partners.

                  "BAe" means British Aerospace Communications, Inc., a Delaware
corporation.

                  "Business Day" means any day on which  commercial banks in New
York City are not required or authorized to close.

                  "Certificate  of   Designations"   means  the  Certificate  of
Designations,  Rights and Preferences establishing the terms and relative rights
and preferences of the Newco Preferred Stock in substantially the form set forth
as Exhibit B to this Agreement.

                  "Claims"  means  all  demands,  claims,  actions  or causes of
action, assessments, losses, damages (including, without limitation,  diminution
in value),  liabilities,  costs and  expenses,  including,  without  limitation,
interest, penalties and attorneys' fees and disbursements.

                  "Closing"  means the  closing  of the  exchange  of  interests
pursuant to the Agreement.

                  "Closing  Date"  means  such  time  and  date as  shall  be as
proposed by ONS not more than ten days after  satisfaction  or waiver of all the
conditions specified in Sections 9 and 10.

                  "COM DEV" means COM DEV Satellite  Communications  Limited,  a
Canadian corporation.

<PAGE>


                  "Consent  and  Agreement"  means  the  Consent  and  Agreement
effective as of December 20, 1991, among Orion Atlantic,  OrionSat,  ONS and the
Exchanging Partners.

                  "Control" means possession,  directly or indirectly,  of power
to direct or cause the  direction of  management  or policies  (whether  through
ownership of voting securities, by agreement or otherwise).

                  "Encumbrance" means any mortgage,  lien, pledge,  encumbrance,
security interest,  deed of trust,  option,  encroachment,  reservation,  order,
decree, judgment, condition,  restriction, charge, agreement, claim or equity of
any kind.

                  "EP  Indemnified  Persons' means the  Exchanging  Partners and
their respective Affiliates,  employees,  representatives,  agents, officers and
directors.

                  "Exhibit" means an exhibit attached to the Agreement.

                  "Exchange Act" means the Exchange Act of 1934, as amended.

                  "Kingston"   means   Kingston   Communications   International
Limited, a company organized under the laws of England.

                  "Kingston  Sales  Representative  Agreements"  means the Sales
Representative Agreement dated as of June 30, 1994, between Orion Atlantic and a
Kingston  Affiliate,  Kingston  Satellite Systems Limited,  as amended,  and the
Ground  Operations  Agreement dated as of June 30, 1994,  between Orion Atlantic
and Kingston, as amended.

                  "Laws" means all foreign,  federal,  state and local statutes,
laws,  ordinances,  regulations,  rules,  resolutions,  orders,  determinations,
writs,  injunctions,  awards  (including,  without  limitation,  awards  of  any
arbitrator),  judgments  and  decrees  applicable  to the  specified  persons or
entities  and  to  the  businesses  and  assets  thereof   (including,   without
limitation,  Laws relating to securities registration and regulation;  the sale,
leasing,  ownership or management of real property;  employment practices, terms
and conditions,  and wages and hours;  building standards,  land use and zoning;
safety, health and fire prevention; and environmental protection).

                  "Limited  Partner"  means ONS and the  Exchanging  Partners as
limited partners of Orion Atlantic.

                  "LP Interest"  means a limited  partnership  interest in Orion
Atlantic.

                  "Lockheed  Martin" means  Lockheed  Martin  Commercial  Launch
Services, Inc., a Delaware corporation.

                                       2

<PAGE>

                  "Material Adverse Effect"  means a material  adverse effect on
the  business,  results  of  operations,  liabilities,   properties,  assets  or
financial condition of ONS and its Subsidiaries, taken as a whole, or a material
adverse effect on the transactions contemplated by this Agreement.

                  "Material Contract" means any contract, instrument, commitment
or  arrangement  of ONS which ONS would be  required  to file with the SEC as an
exhibit to a registration  statement on Form S-1 pursuant to Item  601(b)(10) of
Regulation S-K under the Securities Act.

                  "MCN Sat" means MCN Sat US, Inc., a Delaware corporation.

                  "MCN Sat  Sales  Representative  Agreements"  means  the Sales
Representative  Agreement  dated as of June 30, 1995 between Orion  Atlantic and
MCN Sat Service,  S.A., as amended, and the Ground Operations Agreement dated as
of June 30, 1995 between Orion Atlantic and MCN Sat Service, S.A., as amended.

                  "Newco Common  Stock" means shares of common stock,  par value
$.01 per share, of Newco.

                  "Newco Preferred Stock" means shares of Series C 6% Cumulative
Redeemable  Convertible  Preferred  Stock of Newco,  par value  $.01 per  share,
having the rights and preferences set forth in the Certificate of Designations.

                  "ONS" means ONS Network Systems, Inc., a Delaware corporation.

                  "ONS Common  Stock"  means shares of common  stock,  par value
$.01 per share, of ONS.

                  "ONS  Series  A  Preferred   Stock"  means  the  Series  A  8%
Cumulative Redeemable Convertible Preferred Stock of ONS.

                  "ONS  Series  B  Preferred   Stock"  means  the  Series  B  8%
Cumulative Redeemable Convertible Preferred Stock of ONS.

                  "Orion  Atlantic"  means   International   Private   Satellite
Partners, L.P., a Delaware limited partnership.

                  "Option  Agreements"  means the  applicable  Option  Agreement
effective as of December 20, 1991,  among Orion  Atlantic,  OrionSat and each of
the Exchanging Partners.

                  "OrionSat"  means  Orion  Satellite  Corporation,  a  Delaware
corporation.

                                       3
 

<PAGE>

                 "Partnership  Agreement" means the Second Amended and Restated
Agreement of Limited  Partnership of International  Private Satellite  Partners,
L.P., as amended.

                  "PPU  Agreement"  means  the  Preferred   Participating   Unit
Agreements dated as of October 7, 1993, among Orion Atlantic, OrionSat, and each
of ONS, COM DEV, Kingston, Lockheed Martin and MCN Sat.

                  "Preferred   Bidder  Agreement"  means  the  Preferred  Bidder
Agreement effective as of December 20, 1991, among Orion Atlantic, OrionSat, ONS
and the Exchanging Partners.

                   "Refund Agreement" means the Refund Agreement, dated December
31, 1994,  among Orion  Atlantic,  OrionSat,  ONS and certain of the  Exchanging
Partners.

                  "SEC" means the U.S. Securities and Exchange Commission.

                  "Section" means a Section (or a subsection) of the Agreement.

                  "Securities Act" means the Securities Act of 1933, as amended,
and all laws promulgated pursuant thereto or in connection therewith.

                   "Subscription  Agreement" means the  Subscription  Agreements
effective  as of December  20,  1991,  between  Orion  Atlantic  and each of the
Exchanging Partners.

                  "Subsidiary"   means,   with   respect  to  any  Person,   any
corporation, partnership, association or other business entity of which (i) if a
corporation,  a majority of the total voting  power of shares of stock  entitled
(without regard to the occurrence of any contingency) to vote in the election of
directors,  managers  or  trustees  thereof is at the time owned or  controlled,
directly or indirectly,  by that Person or one or more of the other Subsidiaries
of that Person or a combination  thereof, or (ii) if a partnership,  association
or other  business  entity,  a  majority  of the  partnership  or other  similar
ownership  interest  thereof is at the time  owned or  controlled,  directly  or
indirectly,  by any  Person  or one or more  Subsidiaries  of that  person  or a
combination thereof. For purposes hereof, a Person or Persons shall be deemed to
have a  majority  ownership  interest  in a  partnership,  association  or other
business  entity if such  Person or Persons  shall be  allocated  a majority  of
partnership, association or other business entity gains or losses or shall be or
control a general  partner of such  partnership,  association  or other business
entity.   Without  limiting  the  foregoing,   International  Private  Satellite
Partners,  L.P.,  a  Delaware  limited  partnership,  shall  be  deemed  to be a
Subsidiary of the Corporation for so long as the Corporation or any of its other
Subsidiaries is the general partner thereof.

                                       4

<PAGE>

                  "TA Sat"  means  Trans-Atlantic  Satellite,  Inc.,  a Delaware
corporation.

                  "Tax  Adjustment  Factor"  means,  with  respect  to (i)  BAe,
$11,634;  (ii) COM DEV, $1,940;  (iii) Kingston,  $1,940;  (iv) Lockheed Martin,
$3,878; (v) MCN Sat, $3,878; and (vi) TA Sat, $3,878.

                                       5

<PAGE>




                                                                       EXHIBIT B
                                                                       ---------


                          CERTIFICATE OF DESIGNATIONS,

                             RIGHTS AND PREFERENCES

                                       OF

                        SERIES C 6% CUMULATIVE REDEEMABLE

                           CONVERTIBLE PREFERRED STOCK

                                       OF

                           ORION NEWCO SERVICES, INC.

- --------------------------------------------------------------------------------

                             Pursuant to Section 151
                         of the General Corporation Law
                            of the State of Delaware

- --------------------------------------------------------------------------------


         The  undersigned  DOES HEREBY  CERTIFY that,  pursuant to the authority
contained in Article FOURTH of the Certificate of  Incorporation  of Orion Newco
Services,  Inc., a Delaware corporation (the  "Corporation"),  and in accordance
with Section 151 of the General  Corporation  Law of the State of Delaware,  the
Board of Directors of the Corporation has authorized the creation of a series of
Preferred Stock of the Corporation having the designation Series C 6% Cumulative
Redeemable  Convertible  Preferred  Stock and  having  the  powers,  rights  and
preferences,  and the qualifications,  limitations and restrictions  thereof, as
are set forth in Exhibit A hereto and made a part hereof and that the  following
resolution was duly adopted by the Board of Directors of the Corporation:

                           RESOLVED,  that  a  series  of  authorized  Preferred
                  Stock,  par value $0.01 per share,  of the Corporation be, and
                  it hereby is,  created;  that the shares of such series  shall
                  be, and they hereby are, designated as "Series C 6% 

<PAGE>

                  Cumulative  Redeemable  Convertible Preferred Stock;" that the
                  number of shares  constituting  such  series  shall be, and it
                  hereby is, fixed at _______,000;  and that the powers,  rights
                  and  preferences  and  the  qualifications,   limitations  and
                  restrictions  thereof, of the shares of such series are as set
                  forth in Exhibit A attached hereto and made a part hereof.

         IN WITNESS WHEREOF, the Corporation has caused its corporate seal to be
hereunto  affixed and this  Certificate  to be signed by its President and Chief
Executive  Officer and attested to by its Vice  President,  Corporate  and Legal
Affairs, and Secretary this ____ day of __________, 1996.

                                            ORION NEWCO SERVICES, INC.


                                            By:
                                                     ---------------------------
[SEAL]                                      Name:    W. Neil Bauer
                                            Title:   President/Chief Executive
                                                      Officer


ATTEST:


- -----------------------------------------
Name:      Richard H. Shay, Esq.
Title:     Vice President, Corporate and
              Legal Affairs/Secretary


                                      -2-


<PAGE>

                                                                       EXHIBIT A
                                                                       ---------



                        SERIES C 6% CUMULATIVE REDEEMABLE
                           CONVERTIBLE PREFERRED STOCK

                  The  following  sections  set forth  the  powers,  rights  and
preferences,  and the qualifications,  limitations and restrictions  thereof, of
the Corporation's Series C 6% Cumulative Redeemable Convertible Preferred Stock.
Capitalized terms used herein are defined in Section 10 below.

                  Section 1.        Dividends.
                                    ---------
                  1A. General Obligation.  Subject to the preferential rights of
Series A  Preferred  Stock or Series B  Preferred  Stock  ranking  senior to the
Preferred  Stock,  the record  holders of  Preferred  Stock shall be entitled to
receive  dividends,  when,  as and if  declared  by the  Corporation's  board of
directors  (the  "Board")  and  to  the  extent   permitted  under  the  General
Corporation Law of Delaware,  as amended, as provided in this Section 1, subject
to paragraph 1F.  Dividends shall accrue on a daily basis commencing on the Date
of Issuance of each Preferred  Share at the simple interest rate of 6% per annum
of the Liquidation Value thereof,  and shall be payable as provided in paragraph
1B. Dividends shall cease accruing upon the earliest to occur of (i) the date on
which the  Liquidation  Value of such Preferred  Share is paid, (ii) the date on
which such Preferred  Share is converted into shares of Common Stock  hereunder,
or (iii) the Maturity Date. Such dividends shall accrue whether or not they have
been  declared and whether or not there are net profits,  surplus or other funds
of the Corporation legally available for the payment of dividends.

                  1B.  Payment  of  Dividends.  Subject  to  the  provisions  of
paragraph 1A and paragraph 1F, dividends shall be payable, in arrears, following
each Dividend  Reference  Date within twenty days after such Dividend  Reference
Date.  The amount of the  dividend  on each  share of  Preferred  Stock  payable
following each Dividend  Reference Date shall equal the aggregate  amount of all
accrued and unpaid  dividends  on such share of  Preferred  Stock from the Prior
Dividend  Date (or, in the case of the first  dividend paid with respect to such
share,  the Date of Issuance of such  Preferred  Share)  through  such  Dividend
Reference  Date. To the extent any dividend is not paid within twenty days after
a Dividend Reference Date, all dividends which have accrued and remain unpaid on
each outstanding  Preferred Share through such Dividend  Reference Date shall be
accumulated  and  shall  remain  accumulated  dividends  with  respect  to  such
Preferred  Share until the date paid.  No interest,  dividend or sum of money in
lieu of  interest,  shall be  payable  in  respect  of any  dividend  payment or
payments that may be accrued and unpaid.

<PAGE>


                  1C.  Distribution  of  Partial  Dividend  Payments.  Except in
connection with redemptions or repurchases pursuant to paragraph 3A or 3B below,
if at any time the Corporation pays less than the total amount of dividends then
accrued with respect to the Preferred  Stock such payment  shall be  distributed
ratably among the holders  thereof  based upon the aggregate  accrued but unpaid
dividends  on the  Preferred  Shares held by each such  holder and such  payment
shall be applied first to dividends which have accrued on such Preferred  Shares
during the period since the latest preceding  Dividend Reference Date and second
to reduce any  previously  accumulated  dividends with respect to such Preferred
Shares.

                  1D.   Payment  of  Dividends  in  Common   Stock.   Except  as
specifically  provided  herein,  the  Corporation  shall pay all dividends  with
respect to the Preferred  Stock  (including,  in the case of a  redemption,  any
amount  equal to accrued  and  unpaid  dividends  constituting  a portion of the
Redemption Price) in fully paid and  non-assessable  shares of Common Stock. The
number of shares of Common  Stock  distributable  in a dividend on each share of
Preferred  Stock shall be equal to the  quotient  obtained  by dividing  (a) the
amount of such dividend,  as determined under paragraph 1B, by (b) the higher of
(i) the  Market  Price  of the  Common  Stock  on the  Dividend  Reference  Date
immediately  preceding  the  dividend  payment and (ii) the Series A/B  Dilution
Price.  When the Corporation  pays a dividend to the holders of Preferred Stock,
the Corporation  shall provide each holder of Preferred Stock with a calculation
of the  aggregate  number of shares of Common  Stock  payable in such  dividend,
including the computation of the Market Price.  If any fractional  interest in a
share of Common Stock would,  except for the  provisions  of this  sentence,  be
deliverable  upon  payment  of any  dividend  in  shares of  Common  Stock,  the
Corporation,  in lieu of delivering the fractional share therefor,  shall pay an
amount  to the  holder  thereof  equal to the  Market  Price of such  fractional
interest, calculated as set forth above in this paragraph 1D.

                  1E. Dividends on Junior Securities.  The Corporation shall not
declare and pay any dividends on Junior Securities unless all accrued and unpaid
dividends on the Preferred Stock have been paid in full.

                  1F. Certain Withholding Provisions.  Notwithstanding any other
provision of Section 1, and without limiting the generality of the Board's power
and authority  with respect to the  declaration  and payment of  dividends,  the
Board shall have and may  exercise  the power and  authority to provide that the
receipt  by each  record  holder of  Preferred  Shares  entitled  thereto of any
dividend  paid by the  Corporation  as  declared  on the issued and  outstanding
Preferred Shares shall be subject to the condition (the "Tax Payment Condition")
that the  Corporation  receive,  at or prior  to the  time for  payment  of such
dividend (the "Payment Time"), from or on behalf of such record holder,  payment
in full of the taxes, fees, duties,  assessments,  or other amounts, if any (the
"Tax"), that the Corporation is required under applicable law to pay or withhold
in  connection  with the  declaration  and payment to such record holder of such
dividend.  If the Tax Payment Condition  

                                      -2-


<PAGE>

applies and has been satisfied,  or has been duly waived by the Corporation,  at
or prior to the Payment Time, at the Payment Time the Corporation shall pay such
dividend to such record holder. If the Tax Payment Condition applies but has not
been satisfied, and has not been duly waived by the Corporation,  at or prior to
the Payment Time, at the Payment Time the Corporation  shall pay the dividend to
which such record holder is entitled by irrevocably depositing and setting aside
such  dividend  with the  Secretary  of the  Corporation  as escrow  holder (the
"Escrow Holder").  Upon the Escrow Holder's  receipt,  from or on behalf of such
record  holder,  of payment in full of the Tax, plus any interest,  penalty,  or
additional amount to be paid or withheld as a result of the passage of time from
and after the Payment Time (the "Escrow  Termination  Time"),  the Escrow Holder
shall  release such  dividend to such record  holder and shall release such Tax,
and such additional amount if any, to the Corporation.  If such dividend is paid
in shares of Common Stock and is not received at or prior to the Payment Time by
the  record  holder of  Preferred  Shares  entitled  to  payment  thereof,  then
(notwithstanding  any  provision  hereof  to  the  contrary)  until  the  Escrow
Termination Time (and only until such time, whether or not the dividend has been
released by the Escrow Holder), such record holder shall not be entitled to vote
such shares of Common Stock for any purpose,  to receive payment of dividends or
other  distributions  on such shares of Common  Stock,  or to exercise any other
rights or privileges  in respect of such shares of Common Stock,  and the Escrow
Holder  shall have no right to vote such  shares of Common  Stock or to exercise
any other right or privilege in respect thereof  (whether in accordance with the
wishes or directions of such record holder or otherwise),  but the Escrow Holder
shall receive and hold in escrow until the Escrow Termination Time together with
such shares of Common Stock any dividends  paid or other  distributions  made on
such shares of Common  Stock and at the Escrow  Termination  Time shall  release
such dividends paid or other  distributions made on such shares of Common Stock,
if any, along with such shares of Common Stock.

                  Section 2.        Liquidation.
                                    -----------
                  Subject to the provisions of Section 2 of each of the Series A
Certificate and the Series B Certificate:  upon any Liquidation,  each holder of
Preferred Stock shall be entitled to be paid, before any distribution or payment
is made upon any Junior  Securities,  an amount in cash equal to the  greater of
(a) the  aggregate  Liquidation  Value (plus an amount  equal to all accrued and
unpaid  dividends)  of all shares of Preferred  Stock held by such holder or (b)
the amount which would be distributed with respect to the shares of Common Stock
(including  fractional  shares for purposes of this calculation) into which such
shares  of  Preferred  Stock  are  convertible   (assuming   conversion  of  all
outstanding  Preferred  Stock)  immediately  prior to the  record  date for such
distribution (or, if there is no such record date, then the date as of which the
holders of Common Stock entitled to such  distribution are determined),  and the
holders of Preferred Stock shall not be entitled to any further payment;  and if
upon any such Liquidation the  Corporation's  assets to be distributed among the
holders  of the  Preferred  Stock are  insufficient  to permit  

                                      -3-


<PAGE>

payment to such  holders of the  aggregate  amount which they are entitled to be
paid,  then the entire assets to be  distributed  shall be  distributed  ratably
among such holders based upon the aggregate  Liquidation Value (plus all accrued
and unpaid dividends) of the Preferred Shares held by each such holder. Prior to
such Liquidation, the Corporation shall (to the extent permitted by law) declare
for  payment  all accrued and unpaid  dividends  with  respect to the  Preferred
Stock, which dividends shall be payable in cash  notwithstanding  the provisions
of paragraph 1D. (Payment of the greater of the amounts specified in clauses (a)
and (b) of this Section 2 in respect of such Preferred  Shares shall  constitute
payment of such declared  dividends.) The Corporation  shall mail written notice
of such  Liquidation,  not less than 60 days prior to the  payment  date  stated
therein, to each record holder of Preferred Stock.

                  Section 3.        Redemptions.
                                    -----------
                 3A.  Redemption at the Maturity Date. At the Maturity Date the
Corporation  shall redeem all of the  Preferred  Shares then  outstanding  for a
price equal to the Redemption  Price.  The Corporation  shall pay the Redemption
Price for the  Preferred  Shares within thirty (30) days after the Maturity Date
(or such later date upon which the certificates  evidencing the Preferred Shares
are surrendered to the Corporation).

                  3B.  Redemption at the Option of the Corporation.  At any time
after the Initial  Redemption Date, or, if prior to the Initial Redemption Date,
immediately  prior to the consummation of any  consolidation,  merger or sale in
which the successor  entity or purchasing  entity is other than the Corporation,
to the extent that it has funds legally sufficient therefor, the Corporation may
redeem all or, subject to the last sentence of this paragraph,  a portion of the
Preferred  Shares  then  outstanding  for the  Redemption  Price.  The number of
Preferred Shares to be redeemed from each holder thereof in a partial redemption
pursuant to this paragraph 3B shall be the number of Preferred Shares determined
by  multiplying  the  total  number of  Preferred  Shares  to be  redeemed  by a
fraction,  the  numerator  of  which  shall  be the  total  Redemption  Price of
Preferred  Shares then held by such holder and the denominator of which shall be
the aggregate Redemption Price of Preferred Shares then outstanding.

                  3C. Redemption  Payment.  For each Preferred Share which is to
be redeemed,  the Corporation  shall be obligated to pay the Redemption Price to
the holder thereof on the  Redemption  Date or such later date upon which occurs
the  surrender  by such  holder  at the  Corporation's  principal  office of the
certificate  representing  such  Preferred  Share.  Subject to the provisions of
paragraph  4C of the  Series A  Certificate  and  paragraph  4C of the  Series B
Certificate,  if the funds of the Corporation  legally  available for payment of
the cash portion of the Redemption  Price of Preferred  Shares on any Redemption
Date are  insufficient  to pay the cash portion of the Redemption  Price for the
total number of Preferred  Shares to be 

                                      -4-

<PAGE>

redeemed on such date, those funds which are legally  available shall be used to
redeem the maximum  possible  number of such Preferred  Shares ratably among the
holders  of the  Preferred  Shares  to be  redeemed  based  upon  the  aggregate
Redemption  Price of the  Preferred  Shares  held by each  such  holder  and the
remaining Preferred Shares called for redemption will remain outstanding; and at
any time  thereafter  when  additional  funds  of the  Corporation  are  legally
available for the redemption of Preferred  Shares,  such funds shall immediately
be used to redeem the balance of the Preferred  Shares which the Corporation has
become obligated to redeem on any Redemption Date but which it has not redeemed.
Payment  of the  Redemption  Price in  respect of such  Preferred  Shares  shall
extinguish  all  rights  to  dividends  that are  accrued  and  unpaid as of the
Redemption Date with respect to the Preferred  Shares which are redeemed on such
Redemption Date.

                  3D. Notice of Redemption.  The Corporation  shall mail written
notice  of each  redemption  of any  Preferred  Stock to each  record  holder of
Preferred  Stock  not more  than 60 nor less  than 30 days  prior to the date on
which  such  redemption  is to be made  specifying  (a) the  number of shares of
Preferred Stock to be redeemed by the  Corporation and (b) the Redemption  Date.
Upon  mailing  any such  notice of  redemption,  the  Corporation  shall  become
obligated  to redeem the total  number of  Preferred  Shares  specified  in such
notice at the time of redemption  specified therein and upon the surrender on or
before such time of the certificates  representing such Preferred Shares. If one
or more holders of Preferred  Shares being  redeemed shall fail to surrender the
certificates  representing  such Preferred  Shares by the  Redemption  Date, the
Corporation shall pay the Redemption Price by irrevocably  depositing or setting
aside  the  required   amount  to  be  paid  promptly  upon  surrender  of  such
certificates.  Such  deposit  or  set  aside  shall  be  deemed  payment  of the
Redemption  Price to the holder for whom it is deposited  or set aside.  In case
fewer than the total number of Preferred  Shares  represented by any certificate
are redeemed, a new certificate  representing the number of unredeemed Preferred
Shares shall be issued to the holder thereof  without cost to such holder within
three Business Days after surrender of the certificate representing the redeemed
Preferred Shares.

                  3E.  Dividends after  Redemption Date. No Preferred Share that
is redeemed is entitled to any dividends  accruing after the Redemption Date. On
the  Redemption  Date of any Preferred  Share,  all rights of the holder of such
Preferred  Share shall cease,  and such Preferred Share shall be deemed to be no
longer outstanding.

                  3F.  Redeemed or  Otherwise  Acquired  Preferred  Shares.  Any
Preferred  Shares which are  redeemed,  converted  or otherwise  acquired by the
Corporation  thereupon  shall be  retired.  All such  shares  shall  upon  their
retirement  become  authorized  but unissued  shares of  preferred  stock of the
Corporation  and may not be reissued as  Preferred  Stock but may be reissued as
part  of a new  series

                                      -5-

<PAGE>

of preferred  stock to be created by resolution or  resolutions  of the board of
directors,  subject to the conditions or  restrictions  on issuance set forth in
the certificate of incorporation of the Corporation.

                  Section 4.        Voting Rights.
                                    -------------
                  The holders of the Preferred Stock shall be entitled to notice
of all stockholders  meetings in accordance with the Corporation's  bylaws,  and
except as otherwise required by law, the holders of the Preferred Stock shall be
entitled  to  vote  on all  matters  submitted  to the  stockholders  for a vote
together with the holders of the Common Stock voting  together as a single class
with  each  share of  Common  Stock  entitled  to one vote per  share,  and each
Preferred  Share  (including  fractional  shares)  entitled to one vote for each
whole  share of Common  Stock that would be  issuable  upon  conversion  of such
Preferred Share at the time the vote is taken.

                  Section 5.        Conversion.
                                    ----------
                  5A.      Conversion Procedure.
                           --------------------
                  (i) At any time  and  from  time to time  after  the  issuance
thereof,  any holder of Preferred  Stock may convert all or any of the Preferred
Shares  (including any fraction of a Preferred Share) held by such holder into a
number of shares of Common  Stock  equal to the sum of: (a) the number of shares
of Common Stock  computed by  multiplying  the number of Preferred  Shares to be
converted by the Liquidation Value of a Preferred Share, and dividing the result
by the Conversion Price then in effect,  plus (b) the number of shares of Common
Stock that would be payable if all accrued but unpaid  dividends  were  declared
and paid on the Preferred  Shares to be converted.  For purposes of  determining
the amount of  dividends  payable or that  would be  payable  with  respect to a
conversion  under Section 5, the date for  determining the Market Price shall be
the Business Day immediately preceding the date on which conversion is deemed to
have been effected.

                  (ii) Each  conversion  of  Preferred  Stock shall be deemed to
have  been  effected  as of the  close of  business  on the  date on  which  the
certificate or certificates  representing  the Preferred  Shares to be converted
have been surrendered at the principal office of the Corporation,  together with
written notice of the holder's desire to convert such Preferred  Shares. At such
time as such  conversion  has been  effected,  the  rights of the holder of such
Preferred  Shares as such holder shall cease, and the Person or Persons in whose
name or names any certificate or certificates  for shares of Common Stock are to
be issued  upon such  conversion  shall be deemed to have  become  the holder or
holders  of record of the  shares of Common  Stock  represented  thereby,  which
Common  Stock shall be deemed to have been  issued as of such time.  Issuance of
Common Stock by the  Corporation to effect any conversion  shall  extinguish all
rights  to  dividends  that  are  accrued  and  unpaid  as of the  date 

                                      -6-

<PAGE>

on which conversion is to be made with respect to the Preferred Shares which are
to be converted on such date.

                  (iii) The conversion  rights of any Preferred Share subject to
redemption  hereunder  shall terminate on the Redemption Date for such Preferred
Share  unless  the  Corporation  has  failed to pay to the  holder  thereof  the
Redemption Price thereof.

                  (iv)   Notwithstanding   any  other  provision  hereof,  if  a
conversion  of any Preferred  Shares is to be made in  connection  with a Public
Offering or prior to a redemption,  such  conversion may, at the election of the
holder of such Preferred  Shares,  be conditioned  upon the  consummation of the
Public  Offering or the redemption  occurring on or before a specified  date, in
which  case  such  conversion  shall not be  deemed  to be  effective  until the
consummation of the Public Offering or unless the redemption occurs on or before
the specified date.

                  (v) As soon as possible  after a conversion  has been effected
(but in any event within three  Business  Days in the case of  subparagraph  (a)
below), the Corporation shall deliver to the converting holder:

                  (a)      a certificate or certificates representing the number
                           of shares of Common Stock  issuable by reason of such
                           conversion   in  such   name  or   names   and   such
                           denomination  or   denominations  as  the  converting
                           holder has specified;

                  (b)      payment  of the  amount  payable  under  subparagraph
                           (viii) below with respect to such conversion; and

                  (c)      a certificate representing any Preferred Shares which
                           were  represented by the  certificate or certificates
                           delivered to the  Corporation in connection with such
                           conversion but which were not converted.

                  (vi) The issuance of  certificates  for shares of Common Stock
upon  conversion of Preferred  Stock shall be made without charge to the holders
of such  Preferred  Stock for any issuance tax in respect  thereof or other cost
incurred by the  Corporation in connection  with such conversion and the related
issuance of shares of Common Stock.

                  (vii) The  Corporation  shall not close its books  against the
transfer  of  Preferred  Stock  or of  Common  Stock  issued  or  issuable  upon
conversion  of Preferred  Stock in any manner which  interferes  with the timely
conversion of Preferred Stock.  The Corporation  shall assist and cooperate (but
the Corporation  shall not be required to expend  substantial  efforts or funds)
with any holder of Preferred Shares required to make any governmental filings or
obtain any  governmental  approval prior to or in connection with any conversion
of Preferred Shares hereunder 

                                      -7-


<PAGE>

(including,  without  limitation,  making any filings required to be made by the
Corporation).

                  (viii) If any  fractional  interest in a share of Common Stock
would,  except for the provisions of this subparagraph,  be deliverable upon any
conversion of shares of a holder's Preferred Stock, the Corporation,  in lieu of
delivering  the  fractional  share  therefor,  shall pay an amount to the holder
thereof equal to the Market Price of such fractional interest as of the Business
Day immediately preceding the date of conversion.

                  (ix) The  Corporation  shall  at all  times  reserve  and keep
available out of its authorized but unissued shares of Common Stock,  solely for
the purpose of issuance upon the  conversion of the  Preferred  Stock,  not less
than the number of shares of Common Stock  issuable  upon the  conversion of all
outstanding  Preferred  Stock which may then be exercised.  All shares of Common
Stock which are so issuable  shall,  when  issued,  be duly and validly  issued,
fully paid and  nonassessable  and free from all taxes,  liens and charges.  The
Corporation  shall take all such  actions as may be necessary to ensure that all
such shares of Common Stock may be so issued without violation of any applicable
law or governmental  regulation or any  requirements of any domestic  securities
exchange  upon which shares of Common  Stock may be listed  (except for official
notice of issuance which shall be immediately  delivered by the Corporation upon
each such issuance).

                  5B.  Subdivision  or  Combination  of  Common  Stock.  If  the
Corporation  at any  time  subdivides  (by  any  stock  split,  stock  dividend,
recapitalization  or otherwise) the outstanding shares of one or more classes of
Common  Stock into a greater  number of shares,  the  Conversion  Price (and the
Trigger Price and Series A/B Dilution Price) in effect immediately prior to such
subdivision shall be proportionately reduced, and if the Corporation at any time
combines (by reverse stock split or otherwise) the outstanding  shares of one or
more classes of Common  Stock into a smaller  number of shares,  the  Conversion
Price  (and  the  Trigger  Price  and  Series  A/B  Dilution  Price)  in  effect
immediately prior to such combination shall be proportionately increased.

                  5C. Reorganization, Reclassification, Consolidation, Merger or
Sale. In connection with any Reorganization,  (i) the holders of Preferred Stock
shall  thereafter  have  the  right to  acquire  and  receive,  in lieu of or in
addition  to (as the  case  may be)  the  shares  of  Common  Stock  immediately
theretofore  acquirable  and  receivable  upon the  conversion  of such holder's
Preferred Stock, such shares of stock, securities,  cash or other assets (or, if
not practicably  attainable,  the reasonable  equivalent thereof) as such holder
would have received in connection  with such  Reorganization  if such holder had
converted its Preferred Stock immediately prior to such Reorganization, and (ii)
dividends  and amounts in respect of  dividends  hereunder  payable in shares of
Common  Stock prior to such  Reorganization  shall be  payable,  in lieu of each
share of Common Stock, in such 

                                      -8-

<PAGE>

shares of stock,  securities,  cash or other  assets (or  reasonable  equivalent
thereof) as the holder of one share of Common Stock received in connection  with
such Reorganization. The Corporation shall make appropriate provisions to ensure
that the requirements of the previous sentence are effected.  In each such case,
the  Corporation  shall  also make  appropriate  provisions  to ensure  that the
provisions of this Section 5 and Sections 6 and 7 shall thereafter be applicable
to the Preferred Stock.

                  5D.      Notices.
                           -------
                  (i) Immediately  upon any adjustment of the Conversion  Price,
the  Corporation  shall give written  notice thereof to all holders of Preferred
Stock, setting forth in reasonable detail and certifying the calculation of such
adjustment.

                  (ii) The Corporation  shall give written notice to all holders
of Preferred  Stock at least 20 days prior to the date on which the  Corporation
closes  its books or fixes a record  date (a) with  respect to any  dividend  or
distribution  upon Common Stock,  (b) with respect to any pro rata  subscription
offer to  holders  of Common  Stock or (c) for  determining  rights to vote with
respect to any Liquidation or Reorganization.

                  5E.  Mandatory  Conversion.  The Corporation  may require,  by
written notice to all holders of Preferred  Stock,  the conversion of all of the
outstanding Preferred Stock into a number of shares of Common Stock equal to the
sum of: (a) the number of shares of Common  Stock  computed by  multiplying  the
number  of  Preferred  Shares  to be  converted  by the  Liquidation  Value of a
Preferred Share, and dividing the result by the applicable Conversion Price then
in effect,  plus (b) the number of shares of Common  Stock that would be payable
if all accrued but unpaid  dividends  were  declared  and paid on the  Preferred
Shares to be  converted;  provided  that the Closing  Price of the Common  Stock
(adjusted proportionately for stock dividends, stock splits,  combinations,  and
similar  changes in the Common  Stock  occurring  after the Closing) on at least
twenty (20) of the thirty (30) latest  trading  days  preceding  the date of the
Corporation's  notice has been greater than or equal to the Conversion Price. If
the  Corporation  shall require the conversion of the Preferred Stock under this
Section 5E within two years from the Initial Date of  Issuance,  then the number
of shares of Common Stock into which the shares of Preferred Stock are converted
shall be increased by the number of shares of Common Stock that would be payable
if the Corporation were immediately to declare and pay all dividends that in the
absence of conversion  would have accrued on such shares of Preferred Stock over
the six-month  period  immediately  following the date of conversion;  provided,
however,  that the total  dividends and amounts in respect of dividends  paid on
the Preferred Stock after the Date of Issuance thereof, including any additional
amounts in respect of dividends paid as a result of a required  conversion under
this Section 5E, shall not be less than the 

                                      -9-
<PAGE>

amount of  dividends  that would have accrued on all  outstanding  shares of the
Preferred Stock for one full year following the Initial Date of Issuance.

                  Any  conversion  of  shares  of  Preferred  Stock  under  this
Paragraph  5E shall be  effected  and be deemed to have been  effected as of the
close of business on the date on which the Corporation  provides  written notice
of such  conversion  to the  holders  of such  shares of  Preferred  Stock  (the
"Mandatory  Conversion  Time"),  and as of the Mandatory  Conversion  Time,  the
rights of the holders of the converted shares of Preferred Stock, as such, shall
cease and terminate,  such converted  shares of Preferred Stock shall be retired
in  accordance  with  paragraph  3F, the shares of Common  Stock into which such
shares of Preferred  Stock are converted shall be issued and deemed to have been
issued,  the  certificate(s)  that theretofore  represented  shares of Preferred
Stock thereafter shall represent the number of shares of Common Stock into which
the shares of Preferred Stock  theretofore  represented  thereby shall have been
converted, and the holder of any such certificate, upon the surrender thereof to
the  Corporation,  shall be  entitled  to  receive  from the  Corporation  a new
certificate  representing  the  number of shares of Common  Stock into which the
shares of  Preferred  Stock  theretofore  represented  thereby  shall  have been
converted.

                  5F.      Effect on Conversion Price of Certain Events.
                           --------------------------------------------
                  (i) General.  In order to prevent  dilution of the  conversion
rights  granted under this Section 5, the  Conversion  Price shall be subject to
adjustment from time to time pursuant to this paragraph 5F.

                  (ii)  Adjustment  of Conversion  Price.  If and whenever on or
after the Date of Issuance the  Corporation  issues or sells,  or in  accordance
with  this  paragraph  5F is deemed to have  issued  or sold,  other  than in an
Excluded Issuance,  any share of Common Stock for a consideration per share less
than the Trigger  Price in effect  immediately  prior to such time (a  "Dilutive
Event"),  then  forthwith  upon  such  issue or sale in the  Dilutive  Event the
Conversion  Price shall be reduced by multiplying the Conversion Price in effect
immediately  before the Dilutive Event by a fraction,  the numerator of which is
the number of shares of Common  Stock that are  Outstanding  on an  As-Converted
Basis (as defined below)  immediately  before the Dilutive Event plus the number
of shares of Common Stock that could be  purchased  at the Trigger  Price at the
time of the Dilutive Event for the aggregate  consideration paid or payable upon
the sale or issuance of Common Stock in the Dilutive Event,  and the denominator
of which is the  number of shares of Common  Stock  that are  Outstanding  on an
As-Converted  Basis  immediately  before the  Dilutive  Event plus the number of
shares  that are  acquired  or to be  acquired  upon the sale or issuance of the
Common  Stock in the Dilutive  Event.  For  purposes of this  paragraph  5F(ii),
"Outstanding on an  As-Converted  Basis"  immediately  before the Dilutive Event
means the sum of (i) all Common Stock issued and outstanding  immediately before
the  Dilutive  Event plus (ii) all Common  Stock  issuable  upon the 

                                      -10-

<PAGE>

exercise  of  Options  or  conversion  of  Convertible   Securities  outstanding
immediately before the Dilutive Event (other than Preferred Stock).

                  (iii) Issuance of Rights or Options. If the Corporation in any
manner  grants any  Options  and the price per share for which  shares of Common
Stock are issuable upon the exercise of any such Option is less than the Trigger
Price in effect  immediately  prior to the time of the  granting of such Option,
then such shares of Common Stock shall be deemed to have been issued and sold by
the  Corporation  at the time of the granting of such Options for such price per
share and the  Conversion  Price shall be adjusted in accordance  with paragraph
5F(ii) above.  For purposes of this  paragraph,  the "price per share" for which
shares of Common  Stock are  issuable  upon the  exercise of any Option shall be
equal to the sum of the amounts of consideration (if any) received or receivable
by the Corporation with respect to such shares of Common Stock upon the granting
of the Option and upon  exercise of the  Option.  No further  adjustment  of the
Conversion  Price shall be made upon the actual  issue of such Common Stock upon
the exercise of such Options.

                  (iv) Issuance of Convertible Securities. If the Corporation in
any manner issues or sells any Convertible  Security (or Options to purchase any
Convertible  Security)  and the price per share for shares of Common  Stock that
are issuable upon conversion or exchange  thereof is less than the Trigger Price
in effect  immediately  prior to the time of such issue or sale (or the granting
of such  Option),  then such shares of Common Stock shall be deemed to have been
issued and sold by the  Corporation  at the time of the issuance or sale of such
Convertible Securities (or the granting of such Option) for such price per share
and the Conversion  Price shall be adjusted in accordance with paragraph  5F(ii)
above.  For the  purposes  of this  paragraph,  the  "price per share" for which
shares  of  Common  Stock  are  issuable  upon  conversion  or  exchange  of any
Convertible  Security (or exercise of any Option therefor) shall be equal to the
sum of the  amounts of  consideration  (if any)  received or  receivable  by the
Corporation  upon the issuance of the Convertible  Security (or such Option) and
upon the  conversion  or exchange of such  Convertible  Security (or exercise of
such Option).  No further  adjustment of the Conversion Price shall be made upon
the  actual  issue of such  Common  Stock upon  conversion  or  exchange  of any
Convertible Security, and if any such issue or sale of such Convertible Security
is made upon  exercise of any Options for which  adjustments  of the  Conversion
Price had been or are to be made pursuant to other provisions of this Section 5,
no further  adjustment of the  Conversion  Price shall be made by reason of such
issue or sale.

                  (v) Change in Option Price or Conversion Rate. If the purchase
price provided for in any Option, the additional  consideration (if any) payable
upon the issue,  conversion or exchange of any Convertible Security, or the rate
at which any Convertible Security is convertible into or exchangeable for Common
Stock change at any time, any Conversion Price previously  adjusted with respect
to such Option or Convertible  Security and in effect at the time of such change
shall be 

                                      -11-

<PAGE>

readjusted to the Conversion  Price which would have been in effect at such time
had such Option or  Convertible  Security  originally  provided for such changed
purchase price, additional consideration or changed conversion rate, as the case
may be, at the time initially granted, issued or sold.

                  (vi) Treatment of Expired Options and Unexercised  Convertible
Securities. Upon the expiration of any Option or the termination of any right to
convert or exchange any  Convertible  Security  without the exercise of any such
Option or right, any Conversion Price then in effect hereunder shall be adjusted
to the  Conversion  Price  which  would  have been in effect at the time of such
expiration or termination had such Option or Convertible Security, to the extent
outstanding  immediately  prior to such  expiration or  termination,  never been
issued.

                  (vii)  Calculation of  Consideration  Received.  If any Common
Stock,  Option or Convertible  Security is issued or sold or deemed to have been
issued or sold for cash, the consideration  received therefor shall be deemed to
be the amount  received by the Corporation  therefor.  In case any Common Stock,
Options or Convertible  Securities are issued or sold for a consideration  other
than cash,  the amount of the  consideration  other  than cash  received  by the
Corporation  shall be the fair value of such  consideration,  except  where such
consideration consists of securities,  in which case the amount of consideration
received by the Corporation  shall be the Market Price thereof as of the date of
receipt.  If any Common Stock,  Option or Convertible  Security is issued to the
owners of the  non-surviving  entity in connection  with any merger in which the
Corporation is the surviving  corporation,  the amount of consideration therefor
shall be deemed to be the fair value of such  portion of the assets and business
of the non-surviving  entity as is attributable to such Common Stock, Options or
Convertible Securities,  as the case may be. The fair value of any consideration
other than cash and securities shall be as determined in good faith by the Board
of Directors of the Corporation.

                  (viii) Integrated  Transactions.  In case any Option is issued
in connection  with the issue or sale of other  securities  of the  Corporation,
together   comprising   one   integrated   transaction   in  which  no  specific
consideration  is  allocated to such Option by the parties  thereto,  the Option
shall be deemed to have been issued for a consideration of $.01.

                  (ix) Treasury Shares.  For purposes of calculating  under this
paragraph 5F the number of shares of Common Stock outstanding at any given time,
the number of shares of Common Stock  outstanding  at such time does not include
shares owned or held by or for the account of the  Corporation or any subsidiary
thereof,  and the disposition of any shares so owned or held shall be considered
an issue or sale of Common Stock.

                  (x)  De  Minimis   Adjustments.   Notwithstanding   any  other
provisions of this Section 5, the Corporation  shall not be required to make any

                                      -12

<PAGE>

adjustment  of the  Conversion  Price unless such  adjustment  would  require an
increase or decrease of at least one  percent  (1%) in the  Conversion  Price as
then in effect. Any lesser adjustment shall be carried forward and shall be made
no later than the time of, and together  with,  the next  subsequent  adjustment
which,  together with any adjustment or adjustments  so carried  forward,  shall
amount to an increase or decrease of at least one percent (1%) of the Conversion
Price  as  then  in  effect.  If any  action  would  require  adjustment  of the
Conversion  Price pursuant to more than one  subparagraph  of this paragraph 5F,
only one  adjustment  shall be made as  determined in good faith by the Board of
Directors of the Corporation.

                  Section 6.        Liquidating Dividends.
                                    ---------------------
                  If the  Corporation  declares or pays a  Liquidating  Dividend
upon the  Common  Stock,  then  the  Corporation  shall  pay to the  holders  of
Preferred Stock at the time of payment  thereof the  Liquidating  Dividend which
would have been paid to such  holders had such  Preferred  Stock been  converted
immediately  prior to the record  date fixed for  determining  the  stockholders
entitled to receive payment of such Liquidating Dividend,  or, if no record date
is fixed,  the date as of which the record  holders of Common Stock  entitled to
such dividends are to be determined.

                  Section 7.        Purchase Rights.
                                    ---------------
                  If at any time the  Corporation  grants,  issues  or sells any
Purchase  Rights  pro rata to the record  holders of any class of Common  Stock,
then each holder of Preferred Stock shall be entitled to acquire, upon the terms
applicable to such Purchase  Rights,  the aggregate  Purchase  Rights which such
holder  would  have  acquired  if such  holder  had held the number of shares of
Common Stock  acquirable  upon  conversion  of such  holder's  Preferred  Shares
immediately  before the date on which a record is taken for the grant,  issuance
or sale of such Purchase Rights,  or, if no such record is taken, the date as of
which the record  holders of Common  Stock are to be  determined  for the grant,
issue or sale of such Purchase Rights.

                  Section 8.        Registration of Transfer.
                                    ------------------------
                  The Corporation  shall keep at its principal office a register
for the  registration  of issuances and transfers of Preferred  Stock.  Upon the
surrender of any certificate  representing  Preferred  Stock at such place,  the
Corporation  shall,  at the  request of the record  holder of such  certificate,
execute  and  deliver  (at  the  Corporation's  expense)  a new  certificate  or
certificates  in exchange  therefor  representing in the aggregate the number of
Preferred  Shares  represented  by the  surrendered  certificate.  Each such new
certificate  shall be registered in such name and shall represent such number of
Preferred  Shares as is requested by the holder of the  surrendered  certificate
and shall be substantially identical in form to the surrendered certificate, and
dividends  shall  accrue  on  the  Preferred  Stock   

                                      -13-

<PAGE>

represented by such new  certificate  from the date to which dividends have been
fully paid on such Preferred Stock represented by the surrendered certificate.

                  Section 9.        Replacement.
                                    -----------
                  Upon  receipt  of  evidence  reasonably  satisfactory  to  the
Corporation (an affidavit of the registered holder shall be satisfactory) of the
ownership and the loss,  theft,  destruction  or  mutilation of any  certificate
evidencing  Preferred  Shares,  and in the  case  of any  such  loss,  theft  or
destruction,   upon  receipt  of  indemnity   reasonably   satisfactory  to  the
Corporation  (provided  that if the holder is a financial  institution  or other
institutional  investor,  its own agreement shall be  satisfactory),  or, in the
case of any such mutilation upon surrender of such certificate,  the Corporation
shall (at its  expense)  execute and deliver in lieu of such  certificate  a new
certificate of like kind representing the number of Preferred Shares represented
by such lost, stolen,  destroyed or mutilated  certificate and dated the date of
such lost,  stolen,  destroyed or mutilated  certificate,  and  dividends  shall
accrue on the Preferred Stock  represented by such new certificate from the date
to which dividends have been fully paid on the Preferred  Shares  represented by
such lost, stolen, destroyed or mutilated certificate.

                  Section 10.       Definitions.
                                    -----------
                  "Bond  Offering"  means an  underwritten  offering of notes or
debentures of the Corporation to the public, with or without Options,  primarily
for the  purpose  of  refinancing  the  indebtedness  of  International  Private
Satellite  Partners,  L.P.  ("Orion  Atlantic")  outstanding  under  the  Credit
Agreement dated December 6, 1991 among Orion  Atlantic,  the Banks named therein
and The Chase Manhattan Bank (National Association), as Agent.

                  "Business  Day" means a day on which banks are generally  open
for business in New York City.

                  "Closing" means ______ ___, 1996.

                  "Closing  Price"  of each  share  of  Common  Stock  or  other
security  means the composite  closing price of the sales of the Common Stock or
such other  security on all  securities  exchanges on which such security may at
the time be listed (as  reported in The Wall Street  Journal),  or, if there has
been no sale on any such exchange on any day, the average of the highest bid and
lowest  asked  prices of the  Common  Stock or such other  security  on all such
exchanges  at the end of such day,  or, if such  security is not so listed,  the
closing  price (or last price,  if  applicable)  of sales of the Common Stock or
such other  security  in the Nasdaq  National  Market (as  reported  in The Wall
Street  Journal)  on such day,  or if such  security is not quoted in the Nasdaq
National Market but is traded  over-the-counter,  the average of the highest bid
and lowest asked prices on such day in the  over-the-counter  

                                      -14-

<PAGE>

market as reported by the National Quotation Bureau Incorporated, or any similar
successor organization.

                  "Common Stock" means,  collectively,  the Corporation's common
stock,  par value  $0.01 per share,  and any  capital  stock of any class of the
Corporation  hereafter  authorized  which  is  not  limited  to a  fixed  sum or
percentage  of par or stated  value in  respect  to the  rights  of the  holders
thereof to  participate in dividends or in the  distribution  of assets upon any
Liquidation  of  the  Corporation;  and if  there  is a  change  such  that  the
securities  issuable upon  conversion  of the  Preferred  Stock are issued by an
entity  other  than  the  Corporation  or  there  is a  change  in the  class of
securities so issuable, then the term "Common Stock" shall mean one share of the
security  issuable upon  conversion  of the Preferred  Stock if such security is
issuable in shares,  or shall mean the smallest  unit in which such  security is
issuable if such security is not issuable in shares.

                  "Conversion  Price"  shall mean,  with respect to any Series C
Share,  $17.50  (subject  to  adjustment  as  provided  in  Section 5 for events
occurring after its Date of Issuance).

                  "Convertible  Securities"  means any stock or other securities
of the Corporation convertible into or exchangeable for Common Stock.

                  "Convertible   Subordinated   Debenture   Offering"  means  an
offering  of  convertible  subordinated  debentures  of the  Corporation  to the
public, which debentures would be convertible into Common Stock.

                  "Corporation" means Orion  Newco  Services,  Inc.,  a Delaware
corporation.

                  "Date of Issuance," with respect to any Preferred Share, means
the date on  which  the  Corporation  initially  issues  such  Preferred  Share,
regardless of the number of times  transfer of such  Preferred  Share is made on
the stock records  maintained by or for the  Corporation  and  regardless of the
number of certificates which may be issued to evidence such Preferred Share.

                  "Dividend  Reference  Date" mean  [___________]  of each year,
commencing  __________,  1996, and each of the following:  (i) the date on which
the  Liquidation  Value of such Preferred  Share is paid, (ii) the date on which
such  Preferred  Share is converted into shares of Common Stock  hereunder,  and
(iii) the Maturity Date.

                  "Excluded  Issuance"  means the issue or sale of (i) shares of
Common Stock in respect of any transaction  described in paragraph 5B (including
without  limitation any stock split, stock dividend or  recapitalization),  (ii)
shares of Common  Stock by the  Corporation  pursuant to the exercise of Options
and  Convertible  Securities  outstanding  immediately  prior to the  Closing at
exercise prices that are 

                                      -15-

<PAGE>

greater than or equal to the respective  exercise prices in effect as of Closing
(as adjusted  pursuant to the terms of such  securities  to give effect to stock
dividends  or stock  splits or a  combination  of shares  in  connection  with a
recapitalization,  merger, consolidation or other reorganization occurring after
the Closing),  (iii) up to an aggregate of 150,000 shares of Common Stock by the
Corporation  for any  purpose,  (iv)  Options  to  acquire  Common  Stock by the
Corporation  pursuant to a resolution  of, or a stock option plan  approved by a
resolution of, the Board of Directors of the  Corporation  (or the  compensation
committee  thereof) to the Corporation's  employees or directors,  (v) shares of
Common  Stock,  Options or  Convertible  Securities  (or shares of Common  Stock
pursuant to the exercise of Options and Convertible Securities) as part of or in
connection  with  a  Bond  Offering  or  a  Convertible  Subordinated  Debenture
Offering.

                  "Initial  Date of Issuance"  means the Date of Issuance of the
first share of Preferred Stock to be issued.

                  "Initial  Redemption  Date" means the earlier of (i) the close
of business on ______,  1998.  [two years from the Date of Issuance] or (ii) the
effective date of a Reorganization.

                  "Junior  Securities"  means Common Stock and any other capital
stock or other equity  securities  issued by the Corporation,  whether currently
existing or  hereafter  authorized  or issued  (other than Series A Preferred or
Series B Preferred  or any other series of  preferred  stock of the  Corporation
issued  pursuant to an option  granted to  purchasers  of Series A Preferred  in
connection with the initial issuances of Series A Preferred by the Corporation).

                  "Liquidation" means the liquidation, dissolution or winding up
of the Corporation;  provided, however, that neither the consolidation or merger
of the  Corporation  into or with any other entity or entities,  nor the sale or
transfer by the Corporation of all or any part of its assets,  nor the reduction
of the capital stock of the  Corporation,  shall be deemed to be a  liquidation,
dissolution or winding up of the Corporation.

                  "Liquidating  Dividend" means a dividend upon the Common Stock
payable  otherwise than in cash out of legally  available  funds  (determined in
accordance with generally accepted accounting principles,  consistently applied)
except for a stock dividend payable in shares of Common Stock.

                  "Liquidation  Value" of any Preferred  Share shall be equal to
$1,000.

                  "Market Price" of each share of Common Stock or other security
means,  with  respect to a specified  date,  the Closing  Price of such share or
other security, averaged over a period of the 20 consecutive Business Days prior
to such  date.  If  during  this  period  such  security  is not  listed  on any
securities  exchange,  quoted in the Nasdaq  National  Market,  or quoted in the
over-the-counter  market, 

                                      -16-

<PAGE>

the  Market  Price  will be the fair  value of such  shares of  Common  Stock or
security  determined by agreement  between the  Corporation and the holders of a
majority of the  outstanding  Preferred  Shares.  If such  parties are unable to
reach  agreement  within a  reasonable  period of time,  the fair  value of such
security shall be determined by an independent  appraiser experienced in valuing
such type of  consideration  jointly selected by the Corporation and the holders
of a majority of the outstanding  Preferred  Shares.  The  determination of such
appraiser shall be final and binding upon the parties, and the fees and expenses
of such appraiser shall be borne by the Corporation.

                  "Maturity  Date"  means the close of  business  on ______  __,
2021. [25 years from the Date of Issuance]

                  "Options"  means any options,  warrants or rights to subscribe
for or to purchase Common Stock or any Convertible Securities.

                  "Person" means an individual, a partnership, a corporation, an
association,  a joint stock company,  a limited  liability  company,  a trust, a
joint venture,  an unincorporated  organization and a governmental entity or any
department, agency or political subdivision thereof.

                  "Preferred Share" means a share of Series C Preferred.

                  "Preferred Stock" means the Series C Preferred.

                  "Prior  Dividend  Date"  means,  with  respect  to a  Dividend
Reference Date, the previous  Dividend  Reference Date following which dividends
were  paid on shares  of  Preferred  Stock  hereunder  (or,  if there is no such
previous Dividend Reference Date, the Date of Issuance).

                  "Public Offering" means any offering by the Corporation of its
equity securities to the public pursuant to an effective  registration statement
under the Securities Act of 1933, as then in effect, or any comparable statement
under  any  similar  federal  statute  then in  force;  provided,  that  "Public
Offering"  shall not  include an  offering  made in  connection  with a business
acquisition or combination or an employee benefit plan.

                  "Purchase Rights" means any Options, Convertible Securities or
rights to purchase stock, warrants, securities or other property.

                  "Redemption Date" means the date on which the Redemption Price
of a Preferred Share is paid to the holder thereof.

                  "Redemption   Price"  means  the  Liquidation  Value  of  such
Preferred Share, payable in cash, plus an amount equal to all accrued and unpaid
dividends thereon, payable in shares of Common Stock pursuant to paragraph 1D.

                                      -17-

<PAGE>

                  "Reorganization"  means any recapitalization,  reorganization,
reclassification, consolidation, merger, sale of all or substantially all of the
Corporation's assets to another Person or other transaction which is effected in
such a manner  that  holders of Common  Stock are  entitled  to receive  (either
directly  or upon  subsequent  liquidation)  stock,  securities  or assets  with
respect to or in exchange for Common Stock.

                  "Series A Certificate"  means the Certificate of Designations,
Rights and Preferences for the Series A Preferred.

                  "Series B Certificate"  means the Certificate of Designations,
Rights and Preferences for the Series B Preferred.

                  "Series  A  Preferred"  means  the  Corporation's  Series A 8%
Cumulative Redeemable Convertible Preferred Stock, par value $.01 per share.

                  "Series  B  Preferred"  means  the  Corporation's  Series B 8%
Cumulative Redeemable Convertible Preferred Stock, par value $.01 per share.

                  "Series  C  Preferred"  means  the  Corporation's  Series C 6%
Cumulative Redeemable Convertible Preferred Stock, par value $.01 per share.

                  "Series A/B Dilution Price" means, at any time, the conversion
price  for the  Series  B  Preferred  as then  in  effect  under  the  Series  B
Certificate.

                  "Series A Share" means a share of Series A Preferred.

                  "Series B Share" means a share of Series B Preferred.

                  "Series C Share" means a share of Series C Preferred.

                  "Trigger  Price"  shall  mean,  with  respect  to any Series C
Share,  $14.00  (subject  to  adjustment  as  provided  in Section 5B for events
occurring after its Date of Issuance).

                  Section 11.       Amendment and Waiver.
                                    --------------------

                  No  amendment,  modification  or waiver  shall be  binding  or
effective  with respect to any provision  hereof  without the prior  affirmative
vote or written  consent of the  holders of a majority of the  Preferred  Shares
outstanding at the time such action is taken;  provided,  however,  that without
the prior  affirmative  vote or  written  consent  of each  holder  individually
holding at least 51% of the  Preferred  Stock then  outstanding,  no such action
shall  change  (i) the rate at which or the  manner  in which  dividends  on the
Preferred Stock accrue or the form of  consideration in which such dividends are
payable  or the times at which  such  dividends  become  payable  or the  amount
payable on redemption of the Preferred 

                                      -18-

<PAGE>

Stock or the times at which redemption of Preferred Stock is to occur,  (ii) any
Conversion  Price of the  Preferred  Stock or the  number  of shares or class of
stock into which the  Preferred  Stock is  convertible,  (iii) the  priority  of
payment of dividends to the Preferred Stock, (iv) the Liquidation Value, (v) the
voting rights of the  Preferred  Stock,  (vi) the rights of the Preferred  Stock
upon a  reorganization,  (vii) the  provisions  for mandatory  conversion of the
Preferred Stock,  (viii) the rights of holders of the Preferred Stock to acquire
Purchase Rights,  or (ix) the percentage  required to approve any change in this
Section 11.

                  Section 12.       Notices.
                                    -------
                  Except as otherwise expressly provided hereunder,  all notices
referred to herein shall be in writing and shall be delivered by  registered  or
certified mail,  return receipt  requested and postage prepaid,  or by reputable
overnight  courier service,  charges  prepaid,  and shall be deemed to have been
given when so mailed or sent (i) to the Corporation,  at its principal executive
offices and (ii) to any  stockholder,  at such holder's address as it appears in
the stock records of the  Corporation  (unless  otherwise  indicated by any such
holder).













                                      -19-


<PAGE>


                                                                       EXHIBIT D
                                                                       ---------

                          REGISTRATION RIGHTS AGREEMENT


         THIS  REGISTRATION  RIGHTS  AGREEMENT  (the  "Agreement")  is made  and
entered  into as of _______,  199__,  between and among Orion  Network  Systems,
Inc., a Delaware corporation ("ONS"); British Aerospace Communications,  Inc., a
Delaware  corporation  ("BAe");  COM DEV  Satellite  Communications  Limited,  a
Canadian corporation ("COM DEV"); Kingston Communications International Limited,
a company incorporated under the laws of England  ("Kingston");  Lockheed Martin
Commercial Launch Services,  Inc., a Delaware  corporation  ("Lockheed Martin");
MCN Sat US,  Inc.,  a  Delaware  corporation  ("MCN  Sat");  and  Trans-Atlantic
Satellite, Inc., a Delaware corporation ("TA Sat") (collectively,  BAe, COM DEV,
Kingston,  Lockheed  Martin,  MCN  Sat,  and  TA  Sat  are  referred  to as  the
"Exchanging Partners").

         This Agreement is made in connection  with and is conditioned  upon the
consummation  by ONS and the  Exchanging  Partners of (i) the formation of a new
Delaware  corporation  to be named Orion Newco  Services,  Inc.  ("Newco" or the
"Company")  substantially  identical in all material  respects to ONS;  (ii) the
merger of a newly created subsidiary of Newco into ONS in a transaction in which
all capital  stock of ONS is exchanged for  equivalent  capital stock (common or
preferred,  as applicable,  with the same relative  rights and  preferences)  of
Newco,  and in which ONS becomes a wholly owned  subsidiary of Newco;  and (iii)
the  Exchanging  Partners'  transfer of their limited  partnership  interests in
International  Private Satellite Partners,  L.P., a Delaware limited partnership
("Orion Atlantic"), to Newco in exchange for shares of a newly created series of
the  preferred  stock of Newco  having the  designation  Series C 6%  Cumulative
Redeemable Convertible Preferred Stock (the "Series C Preferred Stock") pursuant
to a Section 351 Exchange  Agreement  and Plan of  Conversion,  dated as of June
___, 1996, between ONS, Orion Atlantic, Orion Satellite Corporation,  a Delaware
corporation,  and the Exchanging Partners ("Exchange  Agreement").  The Series C
Preferred  Stock  issued to the  Exchanging  Partners  pursuant to the  Exchange
Agreement  will be convertible  into shares of common stock,  par value $.01 per
share, of Newco ("Common Stock"), and is to have certain registration rights set
forth herein.

         In consideration of the foregoing, the parties hereto agree as follows:


1.          Definitions.
            -----------
            As used in this Agreement,  the following  capitalized defined terms
shall have the following meanings:

                  "Business  Day" shall mean a day on which banks are  generally
open for business in New York City.


<PAGE>


                  "Closing  Date" shall mean the date of closing of Newco's sale
of its Series C Preferred  Stock to the Exchanging  Partners as  contemplated by
the Exchange Agreement.

                  "Certificate  of   Designations"   means  the  Certificate  of
Designations,  Rights and Preferences establishing the terms and relative rights
and preferences of the Series C Preferred Stock.

                  "Common  Stock" means common stock,  par value $.01 per share,
of  Newco,  and any  capital  stock of Newco  into  which  the  Common  Stock is
converted or convertible.

                  "Company" shall have the meaning set forth in the preamble and
shall also include the Company's  successors or other parties who succeed to the
Company's obligations hereunder.

                  "Eligible   Registrable   Securities"  means  the  Registrable
Securities  which a Holder is  permitted to sell under the terms of the Transfer
Restriction Agreements.

                  "Exchange Act" shall mean the Securities Exchange Act of 1934,
as amended from time to time.

                  "Exchange  Agreement"  shall have the meaning set forth in the
preamble.

                  "Exchanging  Partner"  shall have the meaning set forth in the
preamble.

                  "Holder" shall mean any holder of Registrable Securities.

                  "Initial Shelf  Registration  Statement"  shall mean the Shelf
Registration Statement filed by the Company pursuant to Section 2(a).

                  "Losses" means any losses, claims, damages, liabilities, costs
and expenses, including, but not limited to reasonable attorney's fees.

                  "Majority Holders" shall mean the Holders of a majority of the
Eligible Registrable Securities.

                  "Market Value" shall mean,  with respect to a specified  date,
the  aggregate  closing  price of such shares of Common  Stock,  averaged over a
period of 20 consecutive Business Days prior to such date. If during this period
the Common Stock is not listed on any securities exchange,  quoted on the Nasdaq
National Market, or quoted in the over-the-counter market, the Market Value will
be the fair  value of the Common  Stock  determined  by  agreement  between  the
Company and 

                                      -2-

<PAGE>

the  Holders of a  majority  of the  Eligible  Registrable  Securities.  If such
parties are unable to reach  agreement  within a reasonable  period of time, the
fair value of the Common Stock shall be determined by an  independent  appraiser
experienced  in  valuing  such type of  consideration  jointly  selected  by the
Company and the Holders of a majority of the  Eligible  Registrable  Securities.
The determination of such appraiser shall be final and binding upon the parties,
and the fees and expenses of such appraiser shall be borne by the Company.

                  "Person" shall mean an individual,  partnership,  corporation,
trust, or  unincorporated  organization,  or a government or agency or political
subdivision thereof.

                  "Piggyback  Registration" shall mean the registration by Newco
of the Common  Stock  (whether for its own account or for the account of others)
under the Securities Act, other than a registration  statement filed pursuant to
the provisions of Section 2 or Section 3 hereof or a registration  of securities
in connection with a business  acquisition or combination or an employee benefit
plan.

                  "Prior Registration Rights Agreement" shall mean the following
agreements  entered into by ONS on or before the date of the Exchange  Agreement
under which ONS is obligated to register, or include in a registration statement
under the Securities Act, shares of capital stock of ONS, and all amendments and
supplements  to any such  agreement  entered  into on or before  the date of the
Exchange Agreement,  in each case as such agreement will be amended prior to the
closing  under the  Exchange  Agreement  to  transfer  all of ONS's  rights  and
obligations under each of such agreements to Newco: (i) the Registration  Rights
Agreement dated as of June 17, 1994, among ONS and the Schedule of Investors set
forth therein, as amended (including without limitation the amendment dated June
__, 1996, a copy of which is attached  hereto (the  "Recent  PRRAA"));  (ii) the
Registration Rights Agreement, dated as of April 29, 1994, between ONS and Space
Systems/Loral, Inc. (the "SS/L RR Agreement"); and (iii) the respective Warrants
of  ONS  dated  as  of  December   20,  1991,   granted  to  British   Aerospace
Communications, Inc. and Kingston Communications (Hull) plc.

                  "Proceeding"   means   any   action,   suit,   proceeding   or
investigation or written threat thereof.

                  "Registrable  Securities" shall mean,  regardless of who holds
such  securities  at the  applicable  time,  the shares of Common Stock or other
securities  issued or issuable upon  conversion of the Series C Preferred  Stock
purchased  by the  Exchanging  Partners  pursuant to the  Exchange  Agreement or
issued  as  dividends  or   distributions   pursuant  to  the   Certificate   of
Designations;  provided,  however,  that  such  securities  shall  cease  to  be
Registrable  Securities  when  a  registration  statement  with  respect  to the
registration  of such  securities  shall have been 

                                      -3-

<PAGE>

declared  effective under the Securities Act and such securities shall have been
disposed of pursuant to such registration statement.

                  "Registration  Expenses"  shall  mean  any  and  all  expenses
incident to the filing and  effectiveness  of each  registration  statement  and
performance  of or  compliance  by the Company  with this  Agreement,  including
without  limitation:  (i) all SEC,  stock  exchange or National  Association  of
Securities  Dealers,  Inc. ("NASD")  registration and filing fees, (ii) all fees
and expenses  incurred in connection with  compliance  with state  securities or
blue  sky laws  (including  reasonable  fees and  disbursements  of  counsel  in
connection  with  blue  sky  qualification  of any of the  Eligible  Registrable
Securities and the  preparation of a Blue Sky memorandum and compliance with the
rules of the NASD,  (iii) all  expenses of any Persons in preparing or assisting
in  preparing,  word  processing,  printing and  distributing  any  registration
statement,   any  prospectus,   any  amendments  or  supplements   thereto,  any
underwriting  agreements,  securities sales  agreements,  certificates and other
documents  relating to the  performance of and compliance  with this  Agreement,
(iv) all fees and expenses incurred in connection with the listing of any of the
Eligible  Registrable  Securities  on any  securities  exchange  or  The  Nasdaq
National  Market  System,  (v) the fees and  disbursements  of  counsel  for the
Company and of the independent public accountants of the Company,  including the
expenses of any special audits or "cold comfort" letters required by or incident
to such  performance  and  compliance,  (vi) the fees and  disbursements  of one
special counsel  representing  the Holders of Eligible  Registrable  Securities,
such special counsel to be selected by the Holders of a majority of the Eligible
Registrable  Securities  being  registered,  (vii)  the fees and  expenses  of a
"qualified independent  underwriter" if required by Schedule E of the By-Laws of
the NASD in  connection  with the  offering of any of the  Eligible  Registrable
Securities,  (viii) the fees and expenses of any escrow agent or custodian,  and
(ix) any fees and disbursements of any Underwriters  customarily paid by issuers
or sellers of  securities  and the  reasonable  fees and expenses of any special
experts retained by the Company in connection with any  registration  statement,
but excluding underwriting discounts and commissions and transfer taxes, if any,
relating to the sale or disposition of Registrable Securities by a Holder.

                  "Registration Period" shall mean a period terminating five (5)
years following the Closing Date.

                  "SEC" shall mean the Securities and Exchange Commission.

                  "Securities  Act" shall mean the  Securities  Act of 1933,  as
amended from time to time.

                  "Series C Preferred  Stock" shall mean Series C 6%  Cumulative
Redeemable Convertible Preferred Stock of Newco.

                                      -4-

<PAGE>

                  "Shelf Registration" shall mean a registration  required to be
effected pursuant to Section 2(a).

                  "Shelf   Registration   Statement"   shall   mean  a   "shelf"
registration  statement of Newco which covers the  registration  of  Registrable
Securities  on  a  Form  S-3,  and  all  amendments  and   supplements  to  such
registration  statement,  including  post-effective  amendments,  in  each  case
including  the  prospectus  contained  therein,  all  exhibits  thereto  and all
material incorporated by reference therein; "Shelf Registration Statement" shall
include  the  Initial  Shelf  Registration   Statement  and  each  Top-up  Shelf
Registration Statement.

                  "Top-up  Period"  shall have the  meaning set forth in Section
2(c).

                  "Top-up Shelf  Registration  Statement" shall have the meaning
set forth in Section 2(c).

                  "Transfer  Restriction  Agreement"  means (i) each  agreement,
dated on or about the Closing Date, between Newco and any Exchanging Partner and
(ii)  each  subsequent  agreement  entered  into  between  Newco  and  any of an
Exchanging Partner,  any affiliate thereof, any transferee of Series C Preferred
Stock or Common  Stock into which such Series C Preferred  Stock is converted or
which is issued as a  dividend  on such  Series C  Preferred  Stock or any other
party pursuant to the terms of another Transfer Restriction  Agreement,  in each
case which provides for restrictions on transfer of the Series C Preferred Stock
or Common  Stock into which such Series C Preferred  Stock is converted or which
is issued as a dividend on such Series C Preferred Stock.

                  "Underwriter"  shall mean each Person who  participates  as an
underwriter of securities in a registered offering under the Securities Act.

                  "Underwritten Offering" shall mean a sale of securities of the
Company to an Underwriter or Underwriters for reoffering to the public.


2.                Shelf Registration.
                  ------------------
                  2(a)  Filing of  Initial  Shelf  Registration  Statement.  The
Company shall prepare and cause to be filed as soon as practicable (but no later
than 15 days  after)  the  expiration  of the 180 day period  referred  to under
paragraph  1  of  the  Transfer   Restriction   Agreement,   the  Initial  Shelf
Registration  Statement  providing  for the  registration  of any and all of the
Eligible  Registrable  Securities  each Holder  elects to include in the Initial
Shelf  Registration  Statement.  The Company shall use all its  reasonable  best
efforts to have the Initial Shelf  Registration  Statement declared effective by
the SEC as soon as practicable  after filing.  Subject to Section 7 hereof,  the
Company  shall  use its  reasonable  best  efforts  to keep  the  Initial  Shelf
Registration  Statement  continuously  effective for the Registration Period, or
such shorter period which will  terminate  when all of the 

                                      -5-

<PAGE>

Eligible  Registrable  Securities  covered  by the  Initial  Shelf  Registration
Statement, as amended from time to time pursuant to Section 2(c), have been sold
pursuant to the Initial Shelf Registration Statement.

                  2(b) Election to Include  Eligible  Registrable  Securities in
Initial Shelf Registration  Statement.  The Company shall include in the Initial
Shelf Registration  Statement all Eligible  Registrable  Securities,  other than
Eligible  Registrable  Securities  as to which a Holder  advises  the Company in
writing, at least 15 days prior to the expiration of the 180 day period referred
to under  paragraph 1 of the Transfer  Restriction  Agreement,  that such Holder
does not wish to have included in the Initial Shelf Registration Statement.  Any
Holder who does not advise the Company in writing that such Holder does not wish
to have such Holder's Eligible  Registrable  Securities  included in the Initial
Shelf  Registration  Statement shall be deemed to have assented to the inclusion
thereof.  Notwithstanding  the foregoing,  except as set forth below, any Holder
who does not  provide the  information  reasonably  requested  by the Company in
connection with the Initial Shelf  Registration  Statement shall not be entitled
to have its  Eligible  Registrable  Securities  included  in the  Initial  Shelf
Registration Statement.

                  2(c) Filing of  Subsequent  Shelf  Registration  Statements or
Amendments.  The Company shall use all reasonable  efforts to cause to be filed,
during each successive period of not less than 60 days and not more than 90 days
(as determined by the Company, having regard principally to coordination of such
registration   with  ongoing  business  matters  and  disclosure   requirements)
following  effectiveness  of the  Initial  Shelf  Registration  Statement  which
terminates  on or before the end of the  Registration  Period  (each,  a "Top-up
Period"),  an  additional  Shelf  Registration  Statement  or, at the  Company's
option,  a post-effective  amendment to any  then-effective  Shelf  Registration
Statement  (a  "Top-up  Shelf   Registration   Statement")   providing  for  the
registration of any and all of the Eligible  Registrable  Securities each Holder
elects to include in such Top-up  Shelf  Registration  Statement  which have not
been registered previously. The Company shall use all reasonable efforts to have
each such Shelf  Registration  Statement or  post-effective  amendment  declared
effective by the SEC as soon as practicable  after filing.  Subject to Section 7
hereof,  the Company shall use all reasonable  efforts to keep each Top-up Shelf
Registration  Statement  continuously  effective for the Registration Period, or
such shorter period which will  terminate  when all of the Eligible  Registrable
Securities covered by such Top-up Shelf Registration  Statement, as amended from
time to time  pursuant to this  Section  2(c),  have been sold  pursuant to such
Top-up Shelf Registration Statement.

                  2(d) Election to Include  Eligible  Registrable  Securities in
Top-up Shelf Registration  Statements.  The Company shall give written notice to
all  Holders  of record of its  intention  to file a Top-up  Shelf  Registration
Statement  with the SEC as far in  advance of (and in no event less than 20 days
prior  to) the  anticipated  filing  date,  and set  forth  in such  notice  the
anticipated  filing  date.  The  

                                      -6-

<PAGE>

Company  shall include in the Top-up Shelf  Registration  Statement all Eligible
Registrable  Securities as to which a Holder advises the Company in writing,  at
least 10 days prior to the Top-up  Shelf  Registration  Statement's  anticipated
filing  date,  that such  Holder  wishes to have  included  in the Top-up  Shelf
Registration  Statement. In addition, any Holder who does not advise the Company
in  writing  that  such  Holder  does not wish to have  such  Holder's  Eligible
Registrable Securities included in the Top-up Shelf Registration Statement shall
be deemed to have assented to the inclusion thereof.  Except as set forth below,
any  Holder  who  has  requested  or  assented  to  inclusion  of  its  Eligible
Registrable  Securities in the Top-up Shelf Registration  Statement but who does
not provide the  information  reasonably  requested by the Company in connection
with the Top-up Shelf  Registration  Statement shall not be entitled to have its
Eligible  Registrable  Securities  included  in the  Top-up  Shelf  Registration
Statement.

                  2(e) Effective  Registration  Statement,  Amendments.  A Shelf
Registration  Statement  pursuant  to this  Section 2 will not be deemed to have
become  effective  unless it has been declared  effective by the SEC;  provided,
however,  that if,  after it has been  declared  effective,  the offering of any
Registrable  Securities  pursuant to such  registration  statement is interfered
with by any stop order,  injunction or other order or  requirement of the SEC or
any other  governmental  agency or court,  such  registration  statement will be
deemed not to have  become  effective,  and the  Company  shall be  required  to
continue to use its reasonable best efforts to have such registration  statement
declared effective.  Further, the Company shall, if necessary,  to supplement or
amend each Shelf Registration Statement,  if required by the rules,  regulations
or instructions applicable to the registration form used by the Company for such
Shelf Registration  Statement or by the Securities Act or by any other rules and
regulations thereunder for shelf registration.

                  2(f) Expenses.  The Company shall pay any and all Registration
Expenses  incident  to the  filing  of  each  Shelf  Registration  Statement  or
otherwise  incident to the performance of or compliance by the Company with this
Section 2. Each Holder shall pay all underwriting  discounts and commissions and
transfer  taxes,  if any,  relating to the sale or  disposition of such Holder's
Eligible Registrable Securities pursuant to the Shelf Registration Statement.

                  2(g) Consultation Regarding Top-up Registration. Within thirty
(30) days after the  filing of the second  Top-up  Registration  Statement,  the
Company and the other  parties  hereto shall  consult  regarding (i) whether the
process of filing Top-up  Registration  Statements  rather than  registering all
Registrable  Securities  is  resulting  in any  delays or other  impediments  in
Holders  being able to sell  Eligible  Registrable  Securities,  and (ii) if any
delays are  occurring,  whether this  Agreement  should be modified to eliminate
such delays in view of the detriments associated with such modifications.

                                      -7-

<PAGE>


3.       Demand Registration of Underwritten Offerings.
         ---------------------------------------------
                  3(a)  Requests  for  Underwritten  Registration.  At any  time
following  expiration of the 180 day period referred to under paragraph 1 of the
Transfer Restriction Agreement, one or more Holders may request that the Company
effect a  registration  under the Securities Act of all or any of their Eligible
Registrable Securities in an Underwritten Offering;  provided, however, that the
requesting Holders must request registration of Eligible Registrable  Securities
with a Market  Value,  on the date of such request,  of at least $17.5  million.
Each request for an Underwritten  Offering shall specify the approximate  number
of shares of Eligible Registrable  Securities requested to be registered and the
anticipated  per share  price  range for such  offering.  Within  ten days after
receipt  of any such  request,  the  Company  will give  written  notice of such
requested demand registration to all other Holders and, subject to Section 3(b),
will include in any such registration which constitutes an Underwritten Offering
satisfying  the  requirements  of this  Section  3(a) all  Eligible  Registrable
Securities with respect to which the Company has received  written  requests for
inclusion therein within 15 days after the date the Company's notice is given.

                  3(b)  Priority  on  Underwritten  Offering.  If  the  managing
Underwriters for an Underwritten  Offering advise the Company in writing that in
their reasonable opinion the aggregate number of Eligible Registrable Securities
to be included in an  Underwritten  Offering  (together with any other shares of
Common  Stock  ("Other  Registrable  Stock")  which the  Company is  required to
include  in such  registration  on a pro rata basis  with  Eligible  Registrable
Securities under a Prior  Registration  Rights Agreement)  exceeds the number of
shares which can be sold in an orderly  manner in such  offering  within a price
range  acceptable  to the  Holders of a  majority  of the  Eligible  Registrable
Securities  and  Other  Registrable  Stock  requested  to be  included  in  such
registration,  the Company  will  include in such  registration  (i) first,  the
maximum  amount of  Eligible  Registrable  Securities  requested  to be included
therein,  pro rata  among the  respective  Holders  thereof  on the basis of the
amount of  Eligible  Registrable  Securities  requested  to be  included in such
registration by each such Holder,  and (ii) second,  the maximum amount of Other
Registrable  Stock and any other  securities  requested  to be included  therein
(including by the Company,  subject to Section 3(e)), pro rata among the holders
of such Other  Registrable Stock and other securities on the basis of the number
of shares requested to be included in such  registration by each such holder, in
each case up to the  greatest  number of  shares  of Common  Stock  which in the
reasonable  opinion of such underwriters can be sold in an orderly manner in the
price range of such offering,

                  3(c) Restrictions on Underwritten Offerings.  The Company will
not be  obligated to effect more than one  Underwritten  Offering for Holders of
Eligible  Registrable  Securities within any twelve month period and will not be
obligated to effect an Underwritten Offering for Holders of Eligible Registrable

                                      -8-
<PAGE>

Securities  at any time  before 90 days  after the  earlier  of (i) the date the
previous  registration  statement  prepared in connection  with an  Underwritten
Offering for holders of Eligible  Registrable  Securities ceases to be effective
or (ii) the date that all shares registered thereunder have been sold.

                  3(d) Selection of  Underwriters.  The Holders of a majority of
the  Eligible   Registrable   Securities   requested  to  be  included  in  such
Underwritten Offering will have the right to select the managing  Underwriter(s)
to administer the offering;  provided,  first, that if the Company is successful
in obtaining the services of one or more Underwriters who have been the managing
Underwriters   for  an  Underwritten   Offering  of  the  Company's   securities
previously, such Underwriters shall be the managing Underwriter(s) to administer
the offering;  and provided,  second,  that if the Company  participates  in the
Underwritten  Offering  under  Section  3(e),  such  Holders  shall  obtain  the
Company's consent to managing  Underwriter(s) to administer the offering,  which
consent shall not be unreasonably withheld.

                  3(e)  Inclusion  by the  Company  of its  Common  Stock  in an
Underwritten Offering. If the managing underwriters for an Underwritten Offering
advise the  Company in writing  that in their  opinion the  aggregate  number of
Eligible  Registrable  Securities  to be  included in an  Underwritten  Offering
(together  with any Other  Registrable  Stock) is less than the number of shares
which can be sold in an orderly  manner in such  offering  within a price  range
acceptable to the holders of a majority of the Eligible  Registrable  Securities
and Other Registrable Stock requested to be included in such  registration,  the
Company may include in such registration,  on its own behalf, up to the greatest
number of shares of Common Stock which in the opinion of such  underwriters  can
be sold (together with the Eligible Registrable Securities and Other Registrable
Stock requested to be included in such registration) in an orderly manner in the
price range of such offering.

                  3(f)    Participation    in    Underwritten     Registrations.
Notwithstanding any other provision of this Section 3 to the contrary, no Person
may participate in any  Underwritten  Offering  hereunder unless such Person (a)
agrees to sell such Person's  securities on the basis provided in the applicable
underwriting  arrangements  and (b) completes  and executes all  questionnaires,
powers of attorney,  indemnities,  underwriting  agreements and other  documents
required under the terms of such underwriting arrangements;  provided,  however,
that no Holder of Eligible  Registrable  Securities included in any Underwritten
Offering  shall be required to make any  representations  or  warranties  to the
Company or the underwriters other than  representations and warranties regarding
such Holder and such Holder's intended method of distribution.

                  3(g) Expenses of Underwriting  Offering.  If the  Underwritten
Offering  includes Eligible  Registrable  Securities with a Market Value, on the
date 

                                      -9-

<PAGE>


of the  request  under  Section  3(a) that the Company  effect the  Underwritten
Offering,  of  at  least  $35  million,  the  Company  shall  pay  any  and  all
Registration  Expenses incident to the filing of each registration  statement or
otherwise  incident to the performance of or compliance by the Company with this
Section  3;  if  such  Market  Value  is  less  than  $35  million,  any and all
Registration Expenses incident to the filing of each registration  statement and
other out of pocket expenses incident to the performance of or compliance by the
Company  with  this  Section  3 shall  be borne by the  Holders  whose  Eligible
Registrable  Securities are included in the Underwritten Offering and holders of
any other securities included therein (including the Company, if it is including
its securities in the Underwritten Offering),  pro rata based upon the number of
shares  included by each such  holder.  Each Holder  shall pay all  underwriting
discounts and commissions  and transfer  taxes, if any,  relating to the sale or
disposition of such Holder's  Eligible  Registrable  Securities  included in the
Underwritten Offering.

                  3(h)  Relationship  to  Shelf  Registration.  The  rights  and
obligations  of the parties  hereto under Section 3 shall be in addition to, and
not in lieu of, their respective rights and obligations under Section 2.


4.                Piggyback Registration Rights.
                  -----------------------------
                  4(a)  Requests  for  Piggyback  Registration.  If at any  time
following the expiration of the 180 day period referred to in paragraph 1 of the
Transfer  Restriction  Agreement,  the  Company  proposes  to effect a Piggyback
Registration,  the  Company  will  give  written  notice to all  Holders  of its
intention to effect such a registration and, subject to Section 4(b) and Section
4(c), will include in such registration all Eligible Registrable Securities with
respect to which the Company has received written requests for inclusion therein
within 15 days after the date the Company's notice is given.

                  4(b)  Priority  on  Primary  Registrations.  If  the  proposed
Piggyback  Registration is an underwritten primary registration on behalf of the
Company,  and the  managing  Underwriters  advise the Company in writing that in
their  opinion  the  number  of  securities  requested  to be  included  in such
registration exceeds the number which can be sold in such offering in an orderly
manner within a price range acceptable to the Company,  the Company will include
in such  registration (i) first, the securities the Company proposes to sell and
the High Priority  Registrable  Securities (as defined in the Recent PRRAA), pro
rata  among  the  Company  and the  holders  of such High  Priority  Registrable
Securities on the basis of the number of shares  requested to be included by the
Company and each such holder,  and (ii) second,  the greatest number of Eligible
Registrable Securities and the remaining Other Registrable Stock requested to be
included  which in the  opinion of such  Underwriters  can be sold in an orderly
manner in the  price  range of such  offering,  pro rata  among  the  respective
holders thereof on the basis of the 

                                      -10-

<PAGE>



amount of Eligible  Registrable  Securities or Other Registrable Stock requested
to be included in such registration by each such holder.

                  4(c)  Priority  on  Secondary  Registrations.  If a  Piggyback
Registration is an underwritten  secondary  registration on behalf of holders of
the Company's  securities,  and the managing  Underwriters advise the Company in
writing that in their opinion the number of securities  requested to be included
in such  registration  exceeds  the  number  which can be sold in such  offering
without adversely affecting the marketability of the offering,  the Company will
include in such registration (i) first, the securities  requested to be included
therein by the holders  requesting such registration and any other securities to
be included in such registration  (including Other  Registrable  Stock) and (ii)
second,  the Eligible  Registrable  Securities  requested to be included in such
registration, pro rata among the holders of such Eligible Registrable Securities
and other  securities  on the basis of the  number  of  shares  requested  to be
included by each such holder.

                  4(d) Participation in Piggyback Registrations. Notwithstanding
any other provision of this Section 4 to the contrary, no Person may participate
in any Piggyback  Registrations  hereunder unless such Person (a) agrees to sell
such Person's  securities on the basis provided in the  applicable  underwriting
arrangements  and (b)  completes  and  executes  all  questionnaires,  powers of
attorney,  indemnities,  underwriting  agreements and other  documents  required
under the terms of such underwriting  arrangements;  provided,  however, that no
Holder  of  Eligible   Registrable   Securities   included   in  any   Piggyback
Registrations shall be required to make any representations or warranties to the
Company or the underwriters other than  representations and warranties regarding
such Holder and such Holder's intended method of distribution.

                  4(e) Expenses of Piggyback Registration. The Company shall pay
any and all Registration  Expenses  incident to the filing of each  registration
statement or  otherwise  incident to the  performance  of or  compliance  by the
Company with this Section 4. Each Holder  shall pay all  underwriting  discounts
and commissions and transfer taxes, if any,  relating to the sale or disposition
of such  Holder's  Eligible  Registrable  Securities  included in the  Piggyback
Registration.


5.       Registration Procedures.
         -----------------------
         In  connection  with the  obligations  of the Company with respect to a
registration statement pursuant to Section 2, Section 3 or Section 4 hereof, the
Company shall use its reasonable  best efforts to effect or cause to be effected
(subject to the  provisions  of Section  6(c)  hereof) the  registration  of the
Eligible  Registrable  Securities under the Securities Act to permit the sale of
such Eligible  Registrable  Securities  by the Holders in accordance  with their
intended method or methods of distribution, and the Company shall:

                                      -11-

<PAGE>


                  5(a)  prepare  and  file  with  the  Securities  and  Exchange
Commission a registration  statement  with respect to such Eligible  Registrable
Securities  and use its  reasonable  best  efforts  to cause  such  registration
statement  to  become  effective  within  the  time  period  required  hereunder
(provided  that before  filing a  registration  statement or  prospectus  or any
amendments  or  supplements  thereto,  the Company  will  furnish to one counsel
selected by the holders of 70% of the Eligible Registrable  Securities (together
with any Other Registrable Stock) covered by such registration  statement copies
of all such documents  proposed to be filed,  which documents will be subject to
the  review  of  such  counsel,   and  the  Company  will  incorporate  in  such
registration  statement the reasonable comments of such counsel not inconsistent
with the Company's disclosure obligations under applicable securities laws);

                  5(b)  prepare  and  file  with  the SEC  such  amendments  and
supplements to such registration statement and the prospectus used in connection
therewith as may be necessary to keep such registration  statement effective for
the period required  hereunder (or if no period is so required,  a period of not
less than 180 days or such shorter  period which is  sufficient  to complete the
distribution of the securities registered under the registration  statement) and
comply with the provisions of the Securities Act with respect to the disposition
of all securities  covered by such registration  statement during such period in
accordance  with the intended  methods of disposition by the sellers thereof set
forth in such registration statement;

                  5(c) furnish to each seller of Eligible Registrable Securities
such  number  of copies  of such  registration  statement,  each  amendment  and
supplement  thereto,  the  prospectus  included in such  registration  statement
(including each preliminary  prospectus) and such other documents as such seller
may reasonably  request in order to facilitate  the  disposition of the Eligible
Registrable Securities owned by such seller;

                  5(d) use its  reasonable  best  efforts to register or qualify
such Eligible  Registrable  Securities  under such other  securities or blue sky
laws of such jurisdictions as any seller reasonably  requests and do any and all
other acts and things which may be  reasonably  necessary or advisable to enable
such seller to consummate the disposition in such  jurisdictions of the Eligible
Registrable  Securities owned by such seller (provided that the Company will not
be required to (i) qualify generally to do business in any jurisdiction where it
would not  otherwise  be  required to qualify  but for this  subparagraph,  (ii)
subject itself to taxation in any such  jurisdiction or (iii) consent to general
service of process in any such jurisdiction);

                  5(e)  notify  each   seller  of  such   Eligible   Registrable
Securities (i) at any time when a prospectus  relating thereto is required to be
delivered under the Securities Act, of the happening of any event as a result of
which the prospectus 

                                      -12-

<PAGE>

included  in such  registration  statement  contains  an untrue  statement  of a
material  fact or omits any fact  necessary to make the  statements  therein not
misleading,  and, at the request of any such seller,  the Company will prepare a
supplement or amendment to such  prospectus so that, as thereafter  delivered to
the purchasers of such Eligible Registrable Securities, such prospectus will not
contain  an  untrue  statement  of a  material  fact or omit to  state  any fact
necessary  to  make  the  statements   therein  not  misleading;   (ii)  when  a
registration statement and any amendment thereto has been filed with the SEC and
when the  registration  statement or any  post-effective  amendment  thereto has
become  effective;  (iii) of any request by the SEC for amendment or supplements
to  the  registration  statement  or  the  prospectus  included  therein  or for
additional  information;  (iv)  of the  issuance  by the SEC of any  stop  order
suspending the effectiveness of the registration  statement or the initiation of
any  proceedings  for that  purpose;  and (v) the  receipt by the Company of any
notification  with  respect  to  the  suspension  of  the  qualification  of the
securities  included  therein for sale in any  jurisdiction or the initiation of
any proceeding for such purpose;

                  5(f)  cause all such  Eligible  Registrable  Securities  to be
listed on each  securities  exchange on which similar  securities  issued by the
Company  are  then  listed  and,  if not so  listed,  to be  listed  on the NASD
automated  quotation  system  and,  if  listed on the NASD  automated  quotation
system,  use its  reasonable  best  efforts  to secure  designation  of all such
Eligible  Registrable  Securities  covered by such  registration  statement as a
Nasdaq  "national  market system security" within the meaning of Rule 11Aa2-1 of
the SEC or,  failing  that,  to secure  Nasdaq  authorization  for such Eligible
Registrable Securities and without limiting the generality of the foregoing,  to
arrange for at least two market  makers to register as such with respect to such
Eligible Registrable Securities with the NASD;

                  5(g)  provide  a  transfer  agent and  registrar  for all such
Eligible  Registrable  Securities  not  later  than the  effective  date of such
registration statement;

                  5(h)  enter   into  such   customary   agreements   (including
underwriting  agreements  in customary  form) and take all such other actions as
the holders of a majority of the Eligible Registrable  Securities (together with
any Other Registrable Stock) being sold or the Underwriters,  if any, reasonably
request in order to expedite or  facilitate  the  disposition  of such  Eligible
Registrable Securities;

                  5(i) make available all financial and other records, pertinent
corporate  documents and  properties of the Company for inspection by, and cause
the Company's  officers,  directors,  employees and  independent  accountants to
supply  all  information   reasonably  requested  by,  any  seller  of  Eligible
Registrable  Securities,   any  Underwriter  participating  in  any  disposition
pursuant to such  registration  statement and any attorney,  accountant or other
agent  retained  by any such  seller  or  Underwriter  in  connection  with such
registration  statement who executes any  

                                      -13-

<PAGE>

reasonable  confidentiality  agreement  that may be reasonably  requested by the
Company or who is bound by  fiduciary  duty or  professional  responsibility  to
preserve the confidentiality thereof;

                  5(j) otherwise use its reasonable  best efforts to comply with
all applicable rules and regulations of the SEC; and

                  5(k) use its  reasonable  best efforts to cause such  Eligible
Registrable  Securities covered by such registration  statement to be registered
with or approved by such other  governmental  agencies or  authorities as may be
necessary to enable the sellers  thereof to consummate  the  disposition of such
Eligible Registrable Securities.

                  5(l) take such  reasonable  action as may be necessary so that
(i) any  registration  statement  and any amendment  thereto and any  prospectus
forming part thereof and any amendment or supplement thereto (and each report or
other document  incorporated  therein by reference in each case) complies in all
material  respects  with  the  Securities  Act  and  the  Exchange  Act  and the
respective rules and regulations thereunder, (ii) any registration statement and
any  amendment  thereto does not, when it becomes  effective,  contain an untrue
statement  of a material  fact or omit to state a material  fact  required to be
stated  therein or necessary to make the statement  therein not  misleading  and
(iii)  any  prospectus  forming  part  of any  registration  statement,  and any
amendment or supplement to such prospectus, does not include an untrue statement
of a material fact or omit to state a material  fact  necessary in order to make
the  statements  therein,  in light of the  circumstances  under which they were
made, not misleading.

                  5(m) use its reasonable  best efforts to prevent the issuance,
and  if  issued  to  obtain  the  withdrawal,   of  any  order   suspending  the
effectiveness of any registration statement at the earliest possible time.

                  5(n) unless any Eligible  Registrable  Securities  shall be in
book-entry form, cooperate with the Holders to facilitate the timely preparation
and delivery of certificates  representing Eligible Registrable Securities to be
sold pursuant to any registration  statement free of any restrictive  legend and
in such  permitted  denominations  and  registered  in such names as Holders may
request in connection with the sale of Eligible Registrable  Securities pursuant
to such registration statement.

                  5(o)  use its  reasonable  best  efforts  to  comply  with all
applicable rules and regulations of the SEC and make generally  available to its
security  holders or otherwise  provide in accordance  with Section 11(a) of the
Securities  Act within  the  period  required  after the  effective  date of the
applicable   registration   statement  an  earnings  statement   satisfying  the
provisions of Section 11(a) of the Securities Act and Rule 158 thereof.

                                      -14-

<PAGE>


         The Company may require each Holder of Eligible Registrable  Securities
(i)  to  furnish  to  the  Company  such  information   regarding  the  proposed
distribution  by such  Holder of such  Eligible  Registrable  Securities  as the
Company may from time to time reasonably  request in writing,  and (ii) to enter
into an  underwriting  agreement  and  securities  sales  agreement  in the form
contemplated by Section 5(h).

         Each Holder agrees that, upon receipt of any notice from the Company of
the  happening of any event of the kind  described in Section 5(e) hereof,  such
Holder  will  immediately   discontinue   disposition  of  Eligible  Registrable
Securities  pursuant to a registration  statement until such Holder's receipt of
the copies of the  supplemented  or amended  prospectus  contemplated by Section
5(b) hereof, and, if so directed by the Company, such Holder will deliver to the
Company (at the expense of the Company) all copies in its possession, other than
permanent  file  copies  then in such  Holder's  possession,  of the  prospectus
covering such Eligible Registrable  Securities current at the time of receipt of
such  notice.  If the  Company  shall  give  any  such  notice  to  suspend  the
disposition  of  Eligible  Registrable  Securities  pursuant  to a  registration
statement,  the Company  shall extend the period  during which the  registration
statement shall be maintained effective pursuant to this Agreement by the number
of days  during the  period  from and  including  the date of the giving of such
notice to and including the date when the Holders shall have received  copies of
the supplemented or amended prospectus necessary to resume such dispositions.


6.                Hold-Back Agreements.
                  --------------------
                  6(a)  Restrictions  on Public Sale by Holders.  By electing to
include  Eligible  Registrable  Securities  in a  registration  statement  filed
pursuant  to  Section  3 or  Section  4 hereof,  each  such  Holder of  Eligible
Registrable  Securities  shall be deemed to have agreed not to effect any public
sale or  distribution  of securities of the Company of the same or similar class
or classes of the  securities  included  in the  registration  statement  or any
securities  convertible into or exchangeable or exercisable for such securities,
including  a sale  pursuant to Rule 144 or Rule 144A under the  Securities  Act,
during the 15-day  period  prior to,  and during  such  period of time as may be
required by the  Underwriters,  but not to exceed a 180-day period beginning on,
the  effective  date  of the  registration  statement  (except  pursuant  to the
registration statement), except to the extent otherwise agreed in writing by the
managing Underwriter.

                  6(b)  Restrictions on Public Sale by the Company.  The Company
shall not effect any public sale or distribution of any securities which are the
same as or substantially  similar to the Eligible  Registrable  Securities being
registered  pursuant to a registration  statement filed pursuant to Section 3 or
Section  4  hereof,  or any  securities  convertible  into  or  exchangeable  or
exercisable  for such  securities  during the 15-day period prior to, and during
the 180-day period 

                                      -15-
<PAGE>


beginning on, the effective date of a registration statement (except pursuant to
the registration statement).

                  6(c) Coordination with Prior  Registration  Rights Agreements.
The Company may, as necessary for the Company to perform its  obligations  under
the SS/L RR Agreement,  delay (only to the extent necessary to avoid a violation
by the Company thereunder) in proceeding with any registration, under Section 2,
3 or 4 or otherwise.

7.                Black-Out Periods for Shelf Registration Statements.
                  ---------------------------------------------------
                  Notwithstanding  anything to the  contrary in this  Agreement,
commencing  thirty  (30) days after the  effectiveness  of a Shelf  Registration
Statement,  the Company may, not more than once in any 12-month period,  and one
additional  time  during  the term of this  Agreement  (but not during any other
Suspension  Event or within  thirty  (30) days  after  termination  of any other
Suspension Event),  direct the Holders to suspend sales of Eligible  Registrable
Securities  registered  thereunder,  as provided  herein,  if one or more of the
following  events (a "Suspension  Event") occurs:  (i) an  underwritten  primary
offering  by  the  Company   where  the  Company  is  advised  by  the  managing
Underwriter(s)  for such offering that sale of Eligible  Registrable  Securities
under the Shelf  Registration  Statement  would  have an  adverse  effect on the
primary  offering,  (ii) a private  placement  offering by the Company where the
Company is advised by the placement agent(s) for such offering,  or, if there is
no such placement agent, the Company  reasonably  determines,  based upon advice
from the  Company's  then  financial  advisors,  if any,  that sale of  Eligible
Registrable  Securities  under the Shelf  Registration  Statement  would have an
adverse effect on the private  placement  offering,  (iii) pending  negotiations
relating to, or consummation of, a material corporate transaction (x) that would
require  additional  disclosure  of material  information  by the Company in the
Shelf Registration  Statement (or such filings), (y) as to which the Company has
a bona  fide  business  purpose  for  preserving  confidentiality  and (z) which
renders the Company unable to comply with SEC  requirements,  in each case under
circumstances  that would make it  impractical or inadvisable to cause the Shelf
Registration  Statement  (or such  filings) to become  effective  or to promptly
amend or supplement the Shelf Registration  Statement on a post-effective basis,
as applicable, or (iv) to the extent necessary under the Recent PRRAA.

                  In the case of a Suspension Event, the Company may give notice
(a  "Suspension  Notice")  to the  Holders  to  suspend  sales  of the  Eligible
Registrable  Securities  so that the  Company  may  correct  or update the Shelf
Registration  Statement (or such filings).  Each suspension  shall continue only
for so long as the Suspension Event or its effect is continuing, and in no event
will any suspension  exceed 90 days. The Holders agree that they will not effect
any  sales  of the  Eligible  Registrable  Securities  pursuant  to  such  Shelf
Registration  Statement (or such filings) at any time after they have received a
Suspension Notice from the 

                                      -16-

<PAGE>

Company. If so directed by the Company,  Holders will deliver to the Company all
copies of the prospectus  covering the Eligible  Registrable  Securities held by
them at the time of receipt of the Suspension Notice. The Holders may recommence
effecting  sales of the Eligible  Registrable  Securities  pursuant to the Shelf
Registration Statement (or such filings) following further notice to such effect
(an "End of Suspension Notice") from the Company, which End of Suspension Notice
shall be given by the Company not later than five days after the  conclusion  of
any Suspension  Event and shall be accompanied by copies of the  supplemented or
amended prospectus necessary to resume such sales.

                  Notwithstanding  Section  2,  if  the  Company  shall  give  a
Suspension  Notice  pursuant  to this  Section 7, the Company  shall  extend the
period  during  which  the  Shelf  Registration  Statement  shall be  maintained
effective  pursuant  to this  Agreement  by the number of days during the period
from the date of the giving of the  Suspension  Notice to and including the date
when the Holders shall have received the End of Suspension  Notice and copies of
the supplemented or amended prospectus necessary to resume sales.


8.          Indemnification.
            ---------------
                  8(a)   Indemnification   by  the  Company  The  Company  shall
indemnify,  to the extent permitted by law, each Holder of Eligible  Registrable
Securities,  each Person who controls such Holder (within the meaning of Section
15 of the Securities Act or Section 20 of the Securities Exchange Act) and their
respective officers, directors, partners, employees, agents and representatives,
against all Losses caused by any untrue or alleged untrue  statement of material
fact  contained  in  any  registration  statement,   prospectus  or  preliminary
prospectus  or any amendment  thereof or  supplement  thereto or any omission or
alleged  omission of a material fact required to be stated  therein or necessary
to make the statements  therein, in light of the circumstances under which made,
not  misleading,  except  insofar as the same are caused by or  contained in any
information furnished in writing to the Company by such Holder expressly for use
therein  or by such  Holder's  failure  to  deliver  a copy of the  registration
statement or  prospectus  or any  amendments  or  supplements  thereto after the
Company has furnished such Holder with a sufficient number of copies of the same
and except  insofar as the same are caused by or contained in any  prospectus if
such Holder  failed to send or deliver a copy of any  subsequent  prospectus  or
prospectus  supplement  which would have corrected such untrue or alleged untrue
statement of material  fact or such  omission or alleged  omission of a material
fact with or prior to the delivery of written  confirmation  of the sale by such
Holder after the Company has furnished  such Holder with a sufficient  number of
copies of the same. In connection  with an  Underwritten  Offering,  the Company
will indemnify  such  Underwriters,  each Person who controls such  Underwriters
(within  the  meaning of Section 15 of the  Securities  Act or Section 20 of the
Securities  Exchange Act) and their respective  officers,  directors,  partners,
employees,  agents and representatives 

                                      -17-
<PAGE>


to the same extent as provided above with respect to the  indemnification of the
Holders of Eligible Registrable Securities.

                  8(b)  Indemnification  by  Holders.  In  connection  with  any
registration  statement in which Holders of Eligible Registrable  Securities are
participating,  each such  Holder will  furnish to the  Company in writing  such
information as the Company  reasonably  requests for use in connection  with any
such  registration  statement or prospectus and, to the extent permitted by law,
will  indemnify  the Company,  each Person who controls the Company  (within the
meaning  of  Section 15 of the  Securities  Act or Section 20 of the  Securities
Exchange Act) and their respective  officers,  directors,  partners,  employees,
agents and  representatives  against any Losses arising out of or based upon any
untrue  or  alleged  untrue  statement  of a  material  fact  contained  in  any
registration statement,  prospectus, or form of prospectus, or arising out of or
based upon any omission or alleged  omission of a material  fact  required to be
stated  therein or necessary  to make the  statements  therein,  in light of the
circumstances  under which made, not misleading,  to the extent, but only to the
extent,  that such untrue or alleged  untrue  statement is contained in, or such
omission or alleged  omission is required to be contained in, any information so
furnished  in writing by such  Holder to the Company  expressly  for use in such
registration  statement or  prospectus  and that such  statement or omission was
relied  upon by the  Company  in  preparation  of such  registration  statement,
prospectus  or form of  prospectus;  provided,  however,  that  such  Holder  of
Eligible  Registrable  Securities  shall  not be  liable in any such case to the
extent  that the Holder has  furnished  in writing to the  Company  prior to the
filing  of any  such  registration  statement  or  prospectus  or  amendment  or
supplement thereto information expressly for use in such registration  statement
or prospectus or any amendment or supplement thereto which corrected or made not
misleading,  information  previously  furnished to the Company,  and the Company
failed to include such information  therein.  In no event shall the liability of
any selling Holder of Eligible  Registrable  Securities  hereunder be greater in
amount than the dollar  amount of the proceeds  (net of payment of all expenses)
received  by such Holder upon the sale of the  Eligible  Registrable  Securities
giving rise to such indemnification  obligation.  Such indemnity shall remain in
full force and effect  regardless of any  investigation  made by or on behalf of
such indemnified party.

         8(c)  Conduct of  Indemnification  Proceedings.  If any Person shall be
entitled to indemnity  hereunder such indemnified party shall give prompt notice
to the party or parties from which such indemnity is sought of the  commencement
of  any  Proceeding  with  respect  to  which  such   indemnified   party  seeks
indemnification or contribution  pursuant hereto;  provided,  however,  that the
failure to so notify the indemnifying parties shall not relieve the indemnifying
parties  from  any  obligation  or  liability  except  to the  extent  that  the
indemnifying  parties have been  prejudiced  by such failure.  The  indemnifying
parties  shall  have the  right,  exercisable  by  giving  written  notice to an
indemnified  party  promptly  after the  receipt  of  written  notice  from such
indemnified party of such Proceeding,  to assume, at the indemnifying

                                      -18-
<PAGE>


parties' expense,  the defense of any such Proceeding,  with counsel  reasonably
satisfactory to such indemnified party;  provided,  however, that an indemnified
party or  parties  (if more  than  one  such  indemnified  party is named in any
Proceeding)  shall  have  the  right  to  employ  separate  counsel  in any such
Proceeding and to participate in the defense thereof,  but the fees and expenses
of such  counsel  shall be at the expense of such  indemnified  party or parties
unless the parties to such  Proceeding  include  both the  indemnified  party or
parties and the indemnifying party or parties,  and there exists, in the opinion
of the parties' counsel, a conflict between one or more indemnifying parties and
one or more indemnified  parties, in which case the indemnifying  parties shall,
in connection with any one such Proceeding or separate but substantially similar
or related Proceedings in the same jurisdiction, arising out of the same general
allegations  or  circumstances,  be liable for the fees and expenses of not more
than one separate firm of attorneys (together with appropriate local counsel) at
any time for such indemnified party or parties. If an indemnifying party assumes
the defense of such Proceeding,  the indemnifying parties will not be subject to
any liability for any settlement  made by the  indemnified  party without its or
their consent (such consent not to be unreasonably withheld).

                  8(d) Contribution. If the indemnification provided for in this
Section 8 is unavailable to an indemnified party or is insufficient to hold such
indemnified  party  harmless  for any Losses in respect of which this  Section 8
would otherwise apply by its terms, then each applicable  indemnifying party, in
lieu of  indemnifying  such  indemnified  party,  shall  have an  obligation  to
contribute to the amount paid or payable by such  indemnified  party as a result
of such Losses,  in such  proportion as is  appropriate  to reflect the relative
fault of the indemnifying party, on the one hand, and such indemnified party, on
the other hand, in  connection  with the actions,  statements or omissions  that
resulted in such Losses as well as any other relevant equitable  considerations.
The relative fault of such indemnifying  party, on the one hand, and indemnified
party,  on the other hand,  shall be  determined  by  reference  to, among other
things,  whether any action in question,  including any untrue or alleged untrue
statement of a material fact or omission or alleged omission to state a material
fact,  has  been  taken  by,  or  relates  to  information   supplied  by,  such
indemnifying  party or  indemnified  party,  and the parties'  relative  intent,
knowledge,  access to information and opportunity to correct or prevent any such
action, statement or omission. The amount paid or payable by a party as a result
of any  Losses  shall be deemed to include  any legal or other fees or  expenses
incurred by such party in  connection  with any  Proceeding,  to the extent such
party would have been  indemnified  for such expenses  under Section 8(c) if the
indemnification  provided for in Section  8(a) or Section 8(b) was  available to
such party.  The parties hereto agree that it would not be just and equitable if
contribution  pursuant  to  this  Section  8(d)  were  determined  by  pro  rata
allocation  or by any other method of  allocation  that does not take account of
the equitable considerations referred to in the immediately preceding paragraph.
Notwithstanding  the provision of this Section 8(d), an indemnifying  party that
is a

                                      -19-

<PAGE>

selling  Holder of  Eligible  Registrable  Securities  shall not be  required to
contribute any amount in excess of the amount by which the net proceeds received
by  such  indemnifying  party  exceeds  the  amount  of any  damages  that  such
indemnifying  party has otherwise been required to pay by reasons of such untrue
or alleged untrue statement or omission or alleged omission.  No person adjudged
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.



9.          Miscellaneous.
            -------------
                  9(a) Amendments and Waivers. The provisions of this Agreement,
including  the  provisions  of this  sentence,  may not be amended,  modified or
supplemented,  and waivers or consents to departures from the provisions  hereof
may not be given  unless the Company  has  obtained  the written  consent of the
Majority  Holders;  provided,  however,  that  no  amendment,   modification  or
supplement or waiver or consent to the departure  with respect to the provisions
of Section  2,  Section 3,  Section  4,  Section 7 or Section 8 hereof  shall be
effective  as  against  any Holder of  Eligible  Registrable  Securities  unless
consented to in writing by such Holder of Eligible Registrable Securities.

                  9(b) Notices.  All notices and other  communications  provided
for or permitted hereunder shall be made in writing by hand-delivery, registered
first-class  mail,  telex,  telecopier,  or any courier  guaranteeing  overnight
delivery (i) if to a Holder, at the most current address given by such Holder to
the Company by means of a notice given in accordance with the provisions of this
Section 9(b),  (ii) if to the Company,  at 2440 Research  Boulevard,  Suite 400,
Rockville,  MD 20850,  Attention:  General Counsel, and thereafter at such other
address,  notice of which is given in  accordance  with the  provisions  of this
Section 9(b).

         All such notices and  communications  shall be deemed to have been duly
given:  at the time  delivered by hand, if personally  delivered;  five business
days after  being  deposited  in the mail,  postage  prepaid,  if  mailed;  when
answered back, if telexed; when receipt is acknowledged,  if telecopied;  and on
the  next  business  day if  timely  delivered  to an air  courier  guaranteeing
overnight delivery.

                  9(c) Successors and Assigns. This Agreement shall inure to the
benefit of and be binding upon the  successors,  assigns and transferees of each
of the  parties,  including,  without  limitation  and  without  the need for an
express assignment, subsequent Holders. If any successor, assignee or transferee
of any Holder shall acquire Registrable  Securities,  in any manner,  whether by
operation of law or otherwise, such Registrable Securities shall be held subject
to  all of  the  terms  of  this  Agreement,  and by  taking  and  holding  such
Registrable  Securities 

                                      -20-

<PAGE>

such  Person  shall be  entitled  to receive  the  benefits  hereof and shall be
conclusively  deemed  to  have  agreed  to be  bound  by all of  the  terms  and
provisions hereof.

                  9(d)  Counterparts.  This  Agreement  may be  executed  in any
number of counterparts and by the parties hereto in separate counterparts,  each
of which when so  executed  shall be deemed to be an  original  and all of which
taken together shall constitute one and the same agreement.

                  9(e)  Headings.   The  headings  in  this  Agreement  are  for
convenience  of  reference  only and  shall not limit or  otherwise  affect  the
meaning hereof.

                  9(f) Governing Law;  Consent to  Jurisdiction.  THIS AGREEMENT
AND THE DUTIES AND  OBLIGATIONS  OF THE PARTIES  HERETO SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF DELAWARE, WITHOUT
GIVING EFFECT TO THE CONFLICTS OF LAW  PROVISIONS  THEREOF.  EACH OF THE PARTIES
HERETO AGREES TO SUBMIT TO THE  NON-EXCLUSIVE  JURISDICTION OF THE COURTS OF THE
STATES OF MARYLAND  AND DELAWARE IN ANY ACTION OR  PROCEEDING  ARISING OUT OF OR
RELATING TO THIS AGREEMENT.

                  9(g)  Severability.  In the event  that any one or more of the
provisions contained herein, or the application thereof in any circumstance,  is
held   invalid,   illegal  or   unenforceable,   the   validity,   legality  and
enforceability of any such provision in every other respect and of the remaining
provisions contained herein shall not be affected or impaired thereby.

                  9(h) Specific Performance. The parties hereto acknowledge that
there  would be no  adequate  remedy at law if any party fails to perform any of
its obligations hereunder, and accordingly agree that each party, in addition to
any  other  remedy to which it may be  entitled  at law or in  equity,  shall be
entitled to compel  specific  performance of the  obligations of any other party
under  this  Agreement  in  accordance  with the  terms and  conditions  of this
Agreement  in any  court  of the  United  States  or any  State  thereof  having
jurisdiction.

                  9(i)  Entire  Agreement.  This  Agreement  is  intended by the
parties as a final  expression of their  agreement and intended to be a complete
and exclusive statement of the agreement and understanding of the parties hereto
in respect of the subject matter contained herein. This Agreement supersedes all
prior oral or written  agreements,  commitments  or  understandings  between the
parties with respect to the matters provided for herein.

                  9(j) Execution by Newco.  At or prior to the Closing under the
Exchange Agreement,  ONS shall cause Newco to execute and deliver this Agreement
or a  counterpart  hereof,  at which  time  Newco  shall  become a party to this
Agreement  and be bound  (and have all rights and  obligations  of the  Company)

                                      -21-

<PAGE>


hereunder. Each of the parties hereto hereby agrees to take or cause to be taken
such further actions,  and to execute and deliver such amendments hereto, as may
be necessary or as may be reasonably requested in order to make Newco a party to
this Agreement and be bound (and have all rights and obligations of the Company)
hereunder.

                                      -22-



<PAGE>



         IN WITNESS WHEREOF,  the parties have executed this Agreement as of the
date first written above.

                                        ORION NETWORK SYSTEMS, INC.


                                        By:
                                             -----------------------------------
                                            Name:
                                            Title:



                                        BRITISH AEROSPACE COMMUNICATIONS, 
                                        INC.


                                        By:
                                             -----------------------------------
                                            Name:
                                            Title:



                                        COM DEV SATELLITE COMMUNICATIONS 
                                        LIMITED


                                        By:
                                             -----------------------------------
                                            Name:
                                            Title:



                                        KINGSTON COMMUNICATIONS 
                                        INTERNATIONAL LIMITED


                                        By:
                                             -----------------------------------
                                            Name:
                                            Title:


                                      -23-

<PAGE>




                                        LOCKHEED MARTIN COMMERCIAL LAUNCH 
                                        SERVICES, INC.


                                        By:
                                            ------------------------------------
                                            Name:
                                            Title:



                                        MCN SAT US, INC.


                                        By:
                                            ------------------------------------
                                            Name:
                                            Title:



                                        TRANS-ATLANTIC SATELLITE, INC.


                                        By:
                                            ------------------------------------
                                            Name:
                                            Title:


                                      -24-
<PAGE>


                FIRST AMENDMENT TO REGISTRATION RIGHTS AGREEMENT
                ------------------------------------------------


                  THIS FIRST  AMENDMENT TO REGISTRATION  RIGHTS  AGREEMENT (this
"Amendment") is entered into as of __________,  1996, by and among Orion Network
Systems,  Inc., a Delaware  corporation  (the  "Company"),  and the  undersigned
holders of more than 70% of the Registrable Securities (as defined in and) under
the Registration  Rights Agreement dated June 17, 1994 among the Company and the
Persons  (Series A/B investors) set forth on the Schedule of Investors  attached
thereto (the "Series A/Series B Registration Rights Agreement").

                  WHEREAS,  the Series A/Series B Registration  Rights Agreement
sets forth certain rights of the holders of Registrable Securities to have their
common stock  issuable  upon  conversion  of the Series A and Series B preferred
stock of the Company registered by the Company; and

                  WHEREAS, the Company is proposing to enter into a registration
rights agreement substantially in the form attached hereto, with such changes as
the  holders of more than 70% of the  Registrable  Securities  may agree upon in
writing  (the  "Series C  Registration  Rights  Agreement"),  among the Company;
British  Aerospace  Communications,   Inc.,  COM  DEV  Satellite  Communications
Limited,   Kingston  Communications   International  Limited,   Lockheed  Martin
Commercial  Launch  Services,   Inc.,  MCN  Sat  US,  Inc.,  and  Trans-Atlantic
Satellite, Inc.; and

                  WHEREAS,  the Company is proposing to issue approximately $100
million of convertible  subordinated  debentures or other  securities to finance
its Orion 2 satellite  (the  "Convert"),  and in connection  therewith may enter
into a registration  rights agreement with the purchasers  thereof (the "Convert
Registration Rights Agreement");

                  WHEREAS,  the  parties  hereto  desire  to  amend  the  Series
A/Series B Registration  Rights Agreement to eliminate the conflicts between the
Series  A/Series B Registration  Rights  Agreement and the Series C Registration
Rights Agreement and to provide for a further amendment to the Series A/Series B
Registration  Rights Agreement with respect to the Convert  Registration  Rights
Agreement, and effect certain other changes.

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

<PAGE>


                  1.    PROVISIONS REGARDING OTHER REGISTRATIONS

                  Sections 2(d) and 3(b) of the Series  A/Series B  Registration
Rights  Agreement  are hereby  amended  so that the  provisions  thereof  (which
provisions   restrict  the  Company  from  filing  or  causing  to  be  filed  a
registration  or effecting any public sale or distribution of its securities) do
not apply to any registration or public sale or distribution  under the Series C
Registration Rights Agreement. Instead, the Company agrees that, to the extent a
registration or public sale or distribution of its securities under the Series C
Registration  Rights  Agreement  would  otherwise  have been a violation  of the
Series A/Series B Registration  Rights Agreement,  the Company agrees to use any
then  available  rights  under the Series C  Registration  Rights  Agreement  to
suspend any shelf registration statements filed by the Company thereunder.

                  In addition,  the provisions of Section 3(b)(ii) of the Series
A/Series B Registration  Rights Agreement are hereby amended so that they do not
apply to any of the  Series C 6%  Cumulative  Redeemable  Convertible  Preferred
Stock ("Series C Preferred Stock") or any of the Common Stock issuable or issued
as dividends on or with respect to, or upon  conversion  of,  Series C Preferred
Stock or other  shares of capital  stock issued in respect of Series C Preferred
Stock (whether or not held by the Exchanging Partners).

                  2.    PROVISIONS REGARDING PRIORITY IN PIGGYBACK REGISTRATIONS

                  Section  2(b) of the  Series  A/Series B  Registration  Rights
Agreement is hereby amended to read in its entirety as follows:

                                    (b)  Priority on Primary  Registrations.  If
                  the proposed Piggyback Registration is an underwritten primary
                  registration  on  behalf of the  Company  (not  including  any
                  registration  initiated  by  the  Company  at the  request  of
                  holders of Series C Preferred  Stock  pursuant to Section 3 of
                  the Series C Registation Rights Agreement,  whether or not the
                  Company ultimately  includes its shares in such registration),
                  and the  managing  underwriters  advise the Company in writing
                  that in their opinion the number of securities requested to be
                  included in such registration  exceeds the number which can be
                  sold  in  such  offering  without   adversely   affecting  the
                  marketability  of the  offering,  the Company  will include in
                  such  registration  (i)  first,  the  securities  the  Company
                  proposes to sell and (ii) second,  the Registrable  Securities
                  requested  to be included in such  registration  and any other
                  securities requested to be included in

<PAGE>


                  such  registration,   pro  rata  among  the  holders  of  such
                  Registrable  Securities  and other  securities on the basis of
                  the number of shares  requested  to be  included  by each such
                  holder.  Notwithstanding the prior sentence, if securities are
                  proposed to be included in such Piggyback  Registration  under
                  the Series C Registration  Rights Agreement,  and the managing
                  underwriters  advise  the  Company  in  writing  that in their
                  opinion the number of  securities  requested to be included in
                  such registration exceeds the number which can be sold in such
                  offering without adversely  affecting the marketability of the
                  offering,  the Company will include in such  registration  (i)
                  first,  the securities the Company  proposes to sell and up to
                  one half of the Registrable Securities initially issued by the
                  Company to the holders thereof and requested to be included in
                  such    registration    (the   "High   Priority    Registrable
                  Securities"),  pro rata among the  Company  and the holders of
                  such High Priority Registrable  Securities on the basis of the
                  number of shares  requested  to be included by the Company and
                  each such holder, and (ii) second,  the remaining  Registrable
                  Securities requested to be included in such registration,  the
                  securities requested to be included in such registration under
                  the  Series C  Registration  Rights  Agreement  and any  other
                  securities requested to be included in such registration,  pro
                  rata among the  holders  of such  Registrable  Securities  and
                  other  securities  on  the  basis  of  the  number  of  shares
                  requested to be included by each such holder.

                  3.    WAIVER OF MOST FAVORABLE RIGHTS PROVISION

                  The  provisions  of  Section  1(g) of the  Series  A/Series  B
Registration  Rights  Agreement  (which provide for the Company  agreeing not to
grant materially more favorable  registration rights than were granted under the
Series  A/Series B Registration  Rights  Agreement  unless the Company agrees to
amend the Series  A/Series B  Registration  Rights  Agreement to grant such more
favorable  rights to the  holders  of  Registrable  Securities  under the Series
A/Series B Registration  Rights Agreement) are hereby waived with respect to the
Series C Registration Rights Agreement.

                  4. CONFIRMATION REGARDING PARTICIPATION IN SHELF REGISTRATION

                  The parties  hereto  confirm that the rights of the holders of
Registrable Securities under the Series A/Series B Registration Rights Agreement
entitle such holders to have their Registrable  Securities included in any Shelf
Registration  Statement,  including any Top-Up Shelf 

<PAGE>


Registration  Statement  (as  defined in and)  under the  Series C  Registration
Rights Agreement

                  5.  AGREEMENT TO FURTHER  AMENDMENT  FOR CONVERT  REGISTRATION
                      RIGHTS AGREEMENT

                  The undersigned holders of Registrable Securities hereby agree
to enter into a further  amendment to the Series A/Series B Registration  Rights
Agreement with regard to the Convert Registration Rights Agreement substantially
similar to this Amendment,  provided that the terms of the Convert  Registration
Rights  Agreement are not materially more restrictive with respect to the rights
of (or less favorable to) the holders of Registrable  Securities (as such rights
may be  implemented  by or through the  Company)  than the terms of the Series C
Registration Rights Agreement.

                  6.    MISCELLANEOUS

                        6(a)     Defined Terms

                  Capitalized  terms used in this  Amendment  and not  otherwise
defined in this  Amendment  shall have the  meanings  provided for in the Series
A/Series B Registration Rights Agreement.

                        6(b)     Governing Law

                  This  Amendment,  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 same laws as govern  the  Series  A/Series B
Registration Rights Agreement.

                        6(c)     Counterparts

                  To facilitate execution,  this Amendment 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  Amendment  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.

                        6(d)     Facsimile Execution

<PAGE>


                  To  facilitate  execution,  this  Amendment  may  be  executed
through the use of facsimile  transmission,  and a counterpart of this Amendment
that contains the facsimile  signature of a party,  which  counterpart  has been
transmitted  by facsimile  transmission  to each of the other parties  hereto at
such facsimile numbers as such other parties shall request,  shall constitute an
executed counterpart of this Amendment.

                        6(e)     Ratification

                  The Series A/Series B Registration Rights Agreement, except as
amended and modified as hereinabove set forth,  is in all respects  ratified and
confirmed,  and the terms,  covenants and agreements thereof shall be and remain
in full force and effect.

                       6(f)     Effectiveness of the Amendment

                  This First Amendment to Series A/Series B Registration  Rights
Agreement  is being  made  pursuant  to Section  9(c) of the  Series  A/Series B
Registration  Rights  Agreement  which allows for  amendment and waiver upon the
prior  written  consent  of the  Company  and  holders  of at  least  70% of the
Registrable  Securities,   and  this  First  Amendment  to  Registration  Rights
Agreement shall become effective upon receipt of the signatures (in counterpart)
from the Company and the holders of at least 70% of the  Registrable  Securities
without  any  requirement  that  any  other  party  to  the  Series  A/Series  B
Registration Rights Agreement be a signatory hereto.



<PAGE>



                  IN WITNESS  WHEREOF,  the undersigned  have duly executed this
Amendment, or have caused this Amendment to be duly executed on their behalf, as
of the day and year first hereinabove set forth.


                                         ORION NETWORK SYSTEMS, INC.



                                         By
                                             --------------------------
                                         Its
                                             --------------------------


                                         CIBC WOOD GUNDY VENTURES, INC.


                                         By
                                             --------------------------
                                              Richard J. Brekka
                                              President


                                         FLEET VENTURE RESOURCES, INC.



                                         By
                                             --------------------------
                                         Its


                                         FLEET EQUITY PARTNERS, VI L.P.

                                         By:  Fleet Growth Resources II, Inc., a
                                         General Partner


                                         By
                                             --------------------------
                                         Its
                                             --------------------------




<PAGE>



                                         CHISOLM PARTNERS, II, L.P.

                                         By:  Silverado II, L.P., Its General 
                                         Partner

                                         By:  Silverado II Corp., Its General 
                                         Partner

                                         By
                                             --------------------------
                                         Its
                                             --------------------------



<PAGE>



                                                                       EXHIBIT E
                                                                       ---------

                              __________ ___, 1996



Orion Network Systems, Inc.
Suite 400
2440 Research Boulevard
Rockville, MD 20850

                  Re:  Resale Restrictions
                  ---  -------------------

                  Pursuant to and subject to the terms and conditions  contained
in the Section 351 Exchange  Agreement and Plan of Conversion,  dated as of June
___,  1996,  among  International  Private  Satellite  Partners,   L.P.  ("Orion
Atlantic"),  Orion Network Systems, Inc. ("ONS"),  Orion Satellite  Corporation,
British  Aerospace  Communications,   Inc.,  Com  Dev  Satellite  Communications
Limited,   Kingston  Communications   International  Limited,   Lockheed  Martin
Commercial  Launch  Services,  Inc.,  MCN  Sat  U.S.,  Inc.  and  Trans-Atlantic
Satellite, Inc. (the "Exchange Agreement"),  ONS and the Exchanging Partners (as
defined therein) are agreeing to (i) formation of a new Delaware  corporation to
be named Orion Newco  Services,  Inc.  ("Newco" or the "Company")  substantially
identical in all material respects to ONS; (ii) have a newly created  subsidiary
of Newco merge into ONS in a  transaction  in which all capital  stock of ONS is
exchanged for equivalent capital stock (common or preferred, as applicable, with
the same relative rights and  preferences) of Newco,  and in which ONS becomes a
wholly  owned  subsidiary  of Newco;  and  (iii)  have the  Exchanging  Partners
(including  the  undersigned)  transfer their limited  partnership  interests in
Orion  Atlantic to Newco in  exchange  for shares of a newly  created  series of
preferred  stock  of  Newco  having  the  designation  Series  C  6%  Cumulative
Redeemable  Convertible Preferred Stock (the "Series C Preferred Stock"),  which
shares will be convertible into common stock, par value $.01 per share, of Newco
(the "Common Stock").

                  In consideration of the foregoing, as required by the Exchange
Agreement and in order to induce the parties  thereto to consummate the Exchange
Agreement and the  transactions  contemplated  thereby,  the undersigned  hereby
irrevocably agrees as follows:

                  1. 180 Day  Lockup.  The  undersigned  will not,  directly  or
indirectly,  sell,  offer,  contract  to sell,  make any short  sale,  pledge or
otherwise  dispose  of  ("transfer")  any  shares of Common  Stock  issued  upon
conversion of shares of Series C Preferred  Stock or as dividends on such Series
C Preferred Stock  ("Affected  Shares") without the prior written consent of the
Company for a period of 

<PAGE>

180  days  (the  "Lockup  Period")  from the date of  issuance  of the  Series C
Preferred Stock as contemplated by the Exchange Agreement.

                  Notwithstanding  the foregoing  provision of this paragraph 1,
the undersigned  shall not be precluded from transferring any Affected Shares to
an "affiliate"  (as such term is defined in Rule 144 under the Securities Act of
1933, as amended (the  "Securities  Act")) of the undersigned  during the Lockup
Period in any transfer not involving a public  distribution or public  offering;
provided,  however, that prior to such transfer the transferee shall execute and
deliver to the Company an agreement  substantially  identical to this  agreement
and otherwise  reasonably  satisfactory in form and substance to the Company, in
which such  affiliate  agrees to abide by all of the  restrictions  set forth in
this agreement.

                  Notwithstanding  the foregoing  provision of this paragraph 1,
the undersigned shall not be precluded from transferring any Affected Shares, in
any transfer (i) pursuant to a tender or exchange  offer made by or on behalf of
the Company or a third-party,  (ii) in connection with a merger,  consolidation,
sale of all or  substantially  all of the  assets,  recapitalization  or similar
transaction  involving the Company or (iii) not involving a public  distribution
or offering  registered under the Securities Act and which is not made through a
broker,  dealer or  market-maker  pursuant to Rule 144 under the  Securities Act
(including a pledge that meets such requirements); provided, however, that prior
to any transfer of Affected  Shares under clause (iii) and prior to any transfer
of Series C Preferred  Stock  (other than under the  circumstances  set forth in
clauses (i) or (ii)), the transferee shall execute and deliver to the Company an
agreement  substantially  identical to this  agreement and otherwise  reasonably
satisfactory  in form and  substance  to the Company,  in which such  transferee
agrees to abide by all of the restrictions set forth in this agreement.

                    The  undersigned  further  agrees that prior to the transfer
during the Lockup Period of any Series C Preferred  Stock or Common Stock issued
as dividends paid on Series C Preferred  Stock, the transferee shall execute and
deliver to the Company an agreement  substantially  identical to this  agreement
and otherwise  reasonably  satisfactory in form and substance to the Company, in
which such transferee  agrees to abide by all of the  restrictions  set forth in
this agreement.

                  2.  25%  Limit.  The  undersigned   further  agrees  that  the
undersigned  will not  transfer  during any 90 day period  Affected  Shares that
collectively represent more than 25% of the aggregate number of shares of Common
Stock issuable upon the  conversion of the Series C Preferred  Stock received by
the  undersigned  pursuant to the  Exchange  Agreement  or as  dividends on such
Series C Preferred Stock (the "25% Limit"), except as provided below.

                  Notwithstanding  the foregoing  provision of this paragraph 2,
the  undersigned  shall not be precluded from  transferring  any Affected Shares
after the

<PAGE>


Lockup Period, in any transfer (i) pursuant to an underwritten,  public offering
pursuant to a registration  statement under the Securities Act, (ii) pursuant to
a tender or exchange offer made by or on behalf of the Company or a third-party,
(iii) in connection with a merger,  consolidation,  sale of all or substantially
all of the assets, recapitalization or similar transaction involving the Company
or (iv) not involving a public  distribution  or offering  registered  under the
Securities  Act and which is not made through a broker,  dealer or  market-maker
pursuant to Rule 144 under the Securities Act; provided,  however, that prior to
any  transfer of Affected  Shares under clause (iv) and prior to any transfer of
Series C  Preferred  Stock  (other  than  under the  circumstances  set forth in
clauses (i),  (ii) or (iii)),  the  transferee  shall execute and deliver to the
Company an agreement  substantially  similar to this agreement (but omitting the
provisions of paragraph 1 hereof), reasonably satisfactory in form and substance
to the Company, in which such transferee agrees that it will comply with the 25%
Limit,  pro rated as to the Affected Shares  transferred to it, and that it will
furnish to the Company notice of each sale of Common Stock  certifying that each
such sale, collectively with all prior sales by such entity, did not result in a
violation of the 25% Limit and, provided,  further,  that the number of Affected
Shares that any such  transferee  may sell during the  applicable  90 day period
that includes the original date of transfer to such transferee  shall be reduced
by a number of shares  equal to the  proportionate  number of shares sold by the
transferor during such 90 day period prior to such original date of transfer.

                  3.  Termination of 25% Limit.  The  restrictions  contained in
paragraph 2 hereof, and in all agreements  entered into by transferees  pursuant
to paragraph 2, shall terminate on the date that is five years after the date of
issuance of the Series C Preferred Stock under the Exchange Agreement.

                  4.  Execution by Newco.  At or prior to the Closing  under the
Exchange Agreement,  ONS shall cause Newco to execute and deliver this agreement
or a  counterpart  hereof,  at which  time  Newco  shall  become a party to this
agreement  and be bound  (and have all rights and  obligations  of the  Company)
hereunder. Each of the parties hereto hereby agrees to take or cause to be taken
such further actions,  and to execute and deliver such amendments hereto, as may
be necessary or as may be reasonably requested in order to make Newco a party to
this Agreement and be bound (and have all rights and obligations of the Company)
hereunder.

                  5. Similar Agreements.  ONS represents that ONS is entering or
has  entered  into  agreements  (the  "Similar  Agreements")  with  each  of the
Exchanging  Partners  identical  (other  than  with  respect  to the name of the
Exchanging Partner and the date of signature) to this agreement. ONS agrees that
it will  not  amend  or  waive  one or  more  provisions  of any of the  Similar
Agreements  without  offering to amend or waive one or more  provisions  of this
agreement in an identical manner.

<PAGE>


                  6. General. The undersigned understands that the agreements of
the   undersigned   herein  are  irrevocable  and  shall  be  binding  upon  the
undersigned's  legal  representatives,  successors and assigns.  The undersigned
agrees  and  consents  to the  entry  of stop  transfer  instructions  with  the
Company's  transfer  agent  against  the  transfer  of  Common  Stock  or  other
securities of the Company held by the undersigned except in compliance with this
agreement.


                                            [Name]


                                            By:
                                               ---------------------------------
                                            Its:
                                                  ------------------------------



Agreed and Acknowledged:

ORION NETWORK SYSTEMS, INC.


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

Its:
     ----------------------------

<PAGE>

                                                                    Schedule 7.3
                                                                    ------------

                              List of ONS Approvals
                              ---------------------


1.                Consents of the stockholders of ONS (including consents of the
                  holders of ONS' preferred stock).

2.                Filings may be required under the Hart-Scott-Rodino  Antitrust
                  Improvements Act of 1976, as amended.

3.                Any consent of the U.S. Federal Communications Commission that
                  may  be  required  for  the  Exchange,   notwithstanding   the
                  memorandum from ONS's  communications  counsel attached hereto
                  as   Exhibit  K,  and  the   consent   of  the  U.S.   Federal
                  Communications  Commission  that  will  be  required  for  the
                  Merger.

4.                Any  consents  necessary  to effect  the  transfer  of certain
                  contracts under Section 4.3 hereto.




<PAGE>



                                                                    Schedule 7.9
                                                                    ------------

                           List of Subsidiaries of ONS
                           ---------------------------


Name of Subsidiary                   Number of Shares     Owned of Record By

Orion Satellite Corporation               100             Orion Network 
                                                          Systems, Inc.

OrionNet, Inc.                            100             Orion Network 
                                                          Systems, Inc.

OrionNet Finance Corporation              100             OrionNet, Inc.

Orion Asia Pacific Corporation           1,000            Orion Network 
                                                          Systems, Inc.

Asia Pacific Space and                2,089,392           Orion Network
  Communications, Ltd.           (of 2,511,739 shares        Systems, Inc.
                                     outstanding)





<PAGE>



                                                                   Schedule 7.11
                                                                   -------------


                                 SKYDATA MATTER
                                 --------------


In October  1995,  Skydata  Corporation  ("Skydata"),  a former  Orion  Atlantic
contractor,  filed suit against Orion Atlantic,  Orion Satellite Corporation and
ONS (the "Orion  parties"),  in the United States  District Court for the Middle
District of Florida, claiming that certain Orion Atlantic operations using frame
relay  switches  infringe a Skydata  patent.  Skydata's  suit sought  damages in
excess of $10 million and asked that any  damages  assessed be trebled  although
Skydata's prior demands were for amounts far lower than the amount now sought in
the lawsuit.  On December 11, 1995,  the Orion parties filed a motion to dismiss
the lawsuit on the grounds of lack of jurisdiction  and violation of a mandatory
arbitration  agreement.  In addition,  on December 19, 1995,  the Orion  parties
filed a Demand for  Arbitration  against  Skydata with the American  Arbitration
Association in Atlanta,  Georgia,  requesting  damages in excess of $100,000 for
breach of contract  and  declarations,  among other  things,  that ONS and Orion
Atlantic owns a royalty-free  license to the patent,  that the patent is invalid
and unenforceable and that ONS and Orion Atlantic have not infringed the patent.
On March 5, 1996,  the court  granted ONS's motion to dismiss the lawsuit on the
basis that Skydata's claims are subject to arbitration. Skydata has appealed the
dismissal to the United States Court of Appeals for the Federal Circuit. Skydata
has also filed a counterclaim  in the arbitration  proceeding  asserting a claim
for $2  million  in  damages  as a  result  of the  conduct  of  Orion  and  its
affiliates.  The Orion parties believe that they may be entitled to co-ownership
of the patent at issue  and,  in any event,  that there are  substantial  issues
concerning  inventorship,  validity and  enforceability of the patent as well as
certain  non-infringement  and  contractual  defenses.  On  May  15,  1996,  the
arbitrator  granted the Orion parties'  request for an initial hearing on claims
relating  to the Orion  parties'  rights to the patent,  including  co-ownership
claim and other contractual claims. This initial hearing,  which may obviate the
need for a subsequent hearing on patent infringement and validity,  is scheduled
to begin in late  September  1996.  The  Orion  parties  believe  that they have
meritorious  defenses  and intend to assert  their  position  vigorously  in the
arbitration  proceeding.  Although ONS believes that its potential  exposure for
royalties to Skydata will not be material to its financial conditions or results
of operations, there can be no assurance as to the outcome of this matter.










                                                                       EXHIBIT A



AT THE COMPANY                        AT THE FINANCIAL RELATIONS BOARD
- --------------                        --------------------------------
David J. Frear                        Marianne Stewart - Gen Info (212) 661-8030
V.P. and Chief Financial Officer      Jordan Darrow - Analyst (212) 661-8030
(301) 258-3332                        Wendy Shapiro - Media (212) 661-8030

FOR IMMEDIATE RELEASE
- ---------------------
December 16, 1996

              ORION NETWORK SYSTEMS TO ACQUIRE PARTNERS' INTERESTS
              ----------------------------------------------------

          Contracts for Construction and Launch of Additional Satellite
          -------------------------------------------------------------

ROCKVILLE,  MD, December 16, 1996 -- Orion Network Systems, Inc. (NASDAQ:  ONSI)
announced today that it has agreed to acquire all of the interests which it does
not  already  own in the  Orion  Atlantic  partnership.  Orion  Network  Systems
currently owns 41.7% of Orion Atlantic,  a limited partnership formed in 1991 to
construct, launch and operate communications satellites over the Atlantic Ocean.
The  partners  whose  interests  are being  acquired  by the Company are British
Aerospace, ComDev, Kingston Communications,  Lockheed Martin, Matra Hachette and
Nissho Iwai Corp.

Orion will exchange  approximately  $122 million of convertible  preferred stock
for the acquired interests.  The preferred stock will be convertible into common
stock at $17.50 per  share,  representing  approximately  seven  million  common
shares. The acquisition, which is expected to be completed in the first quarter,
1997, is subject to stockholder  approval and the  refinancing of  approximately
$210 million of existing Orion Atlantic partnership bank debt.

In connection with the acquisition,  British Aerospace will invest approximately
$50 million in convertible securities of Orion,  representing  approximately 3.5
million common shares.

Orion's first  satellite,  located over the Atlantic Ocean, has been operational
since January 1995, and serves Europe,  the United States to the Rocky Mountains
and portions of Canada and Mexico. Orion recently announced a major expansion of
its international satellite communications services into the Asia Pacific region
with  the  signing  of an $89  million  agreement  with  DACOM,  a major  Korean
telecommunications  common  carrier,  for satellite  communications  capacity to
serve the Korean peninsula. Hughes Space -more-

                                      A-1
<PAGE>



and Communications International, Inc. has been selected to construct and launch
Orion's Asia Pacific regional satellite.  The Asia Pacific satellite is expected
to be operational  by the fourth  quarter 1998.  The Company  expects to arrange
permanent  financing  for the Asia Pacific  satellite  by the second  quarter of
1998.

Orion today also  announced the signing of a contract for the  construction  and
launch of a satellite  which will  provide  expanded  capacity  and  coverage of
Europe,  Russia,  South  America  and  the  eastern  U.S.  Construction  of this
satellite  will  commence  coincident  with  Orion's  acquisition  of the  Orion
Atlantic  partnership  interests.  It will be constructed by Matra Marconi Space
and  launched  by  Lockheed  Martin's  Atlas IIAS  launch  vehicle in the second
quarter of 1999.  The Company  expects to arrange  permanent  financing for this
satellite by the second quarter of 1998.

Orion Network  Systems  President and Chief  Executive  Officer,  W. Neil Bauer,
commented  "Elimination  of the complex  partnership  will greatly  simplify our
corporate  structure  and  significantly  increase our equity base.  Our current
operations have  demonstrated the existence of significant  demand for satellite
communications  services such as private business  networks,  video distribution
and direct-to-home video (DTH). With three operational satellites, Orion will be
capable of providing global  communications  services to over 75% of the world's
population   with  an   emphasis   on  areas  with   relatively   underdeveloped
communications infrastructure."

Orion Network Systems is an international satellite  communications company that
provides  private,  multimedia,  network  communications  services  directly  to
multinational  businesses via small receiving  antennas which bypass terrestrial
infrastructures. It also transmits video communications for television and other
program  distribution  services.  Orion  currently  serves  over  150  customers
throughout  North America,  Europe and Latin America,  including  Amoco,  Amway,
AT&T, BBC World Services, Citibank, Colgate Palmolive, Pepsi Cola International,
Viacom and Westinghouse.

                                      # # #






                                       A-2




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