ORION NETWORK SYSTEMS INC/NEW/
S-3, 1997-11-13
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 13, 1997
                                                    REGISTRATION NO. 333-_______
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              --------------------
                                    FORM S-3

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                              --------------------

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

               DELAWARE                                    52-2008654
   (State or other jurisdiction of                       (I.R.S. Employer
    incorporation or organization)                     Identification Number)
 
                             2440 RESEARCH BOULEVARD
                                    SUITE 400
                            ROCKVILLE, MARYLAND 20850
                                 (301) 258-8101
          (Address, including zip code, and telephone number, including
             area code, of registrant's principal executive offices)
                              --------------------

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

                             STEVEN M. KAUFMAN, ESQ.
                             HOGAN & HARTSON L.L.P.
                           555 THIRTEENTH STREET, N.W.
                             WASHINGTON, D.C. 20004
                                 (202) 637-5600
                              --------------------

           APPROXIMATE  DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As
soon as practicable after this Registration Statement becomes effective.

           If the only  securities  being  registered  on this  form  are  being
offered pursuant to dividend or interest  reinvestment  plans,  please check the
following box. |_|
                              --------------------
           If any of the  securities  being  registered  on this  Form are to be
offered  on a  delayed  or  continuous  basis  pursuant  to Rule 415  under  the
Securities Act of 1933,  other than  securities  offered only in connection with
dividend or interest reinvestment plans, check the following box. |X|
                              --------------------
           If this  Form is  filed  to  register  additional  securities  for an
offering  pursuant to Rule 462(b) under the Securities Act of 1933, please check
the following box and list the  Securities  Act of 1933  registration  statement
number of the earlier  effective  registration  statement for the same offering.
|_|
                              --------------------
           If this Form is a  post-effective  amendment  filed  pursuant to Rule
462(c) under the  Securities  Act of 1933,  check the following box and list the
Securities Act of 1933  registration  statement number of the earlier  effective
registration statement for the same offering. |_|
                              --------------------
           If delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box. |_|

<TABLE>
<CAPTION>
                                           CALCULATION OF REGISTRATION FEE
===============================================================================================================
                                               Proposed maximum        Proposed maximum       
  Title of each class of       Amount to be   offering price per      aggregate offering     Amount of
rsecurities to be registered     registered          (1) (2)                  (1)         registration fee (1)
- ---------------------------------------------------------------------------------------------------------------
<S>                              <C>                <C>                 <C>                    <C>
Common Stock, par value
 $.01 per share                  5,052,202          $16.8125            $84,940,146.12         $25,740
===============================================================================================================
</TABLE>

(1)  Estimated  pursuant to Rule 457(c) solely for purposes of  calculating  the
amount of the registration  fee, based on the average of the high and low prices
of the Common Stock,  as reported on the Nasdaq  National Market on November 11,
1997.

(2)  Pursuant  to Rule 416,  there also are being  registered  an  indeterminate
number of shares of the Common Stock,  which may become issuable pursuant to the
antidilution provisions of the underlying convertible securities.

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

                                5,052,202 SHARES

                           ORION NETWORK SYSTEMS, INC.

                                  COMMON STOCK

           This  Prospectus  relates  to the offer and sale from time to time by
certain  holders (the  "Selling  Stockholders")  of up to 5,052,202  shares (the
"Offered Shares") of common stock, par value $.01 per share ("Common Stock"), of
Orion Network Systems,  Inc. ("Orion" or the "Company").  Certain of the Offered
Shares  (4,030,627  shares) are issuable to certain of the Selling  Stockholders
upon  conversion  of shares of the Company's  Series C 6% Cumulative  Redeemable
Convertible  Preferred Stock (the "Series C Preferred  Stock")  received by such
Selling Stockholders in exchange for their limited partnership  interests in the
Company's  subsidiary,  International  Private Satellite Partners,  L.P. ("Orion
Atlantic"), or as dividends on the Series C Preferred Stock (241,835 shares). Of
the remaining 779,740 Offered Shares,  (i) 65,455 shares were acquired by or are
issuable to one of the Selling  Stockholders  in connection with the issuance by
the Company of Common Stock on August 1, 1997 and proposed  issuance on February
1, 1998, as interest payments on $10 million of the Company's convertible junior
subordinated  debentures (the "Debentures") and (ii) 714,285 shares are issuable
to the same Selling Stockholder upon conversion of shares of the Debentures held
by such Selling Stockholder.  This Prospectus also relates to such indeterminate
number of shares of the Common  Stock  which may become  issuable to the Selling
Stockholders  pursuant to the antidilution  provisions of the Series C Preferred
Stock  and  Debentures.   The  registration  of  the  Offered  Shares  does  not
necessarily mean that the Selling  Stockholders will convert any of the Series C
Preferred  Stock or Debentures or offer or sell any of the Offered  Shares.  The
Company  is  registering  the  Offered  Shares  as  required  under the terms of
registration rights agreements between the Company and the Selling Stockholders.
The  Company  will  receive no part of the  proceeds  from sales of the  Offered
Shares. See "Selling Stockholders" and "Plan of Distribution."

       The Common Stock is traded on the Nasdaq National Market under the symbol
"ONSI." On November 11, 1997,  the last  reported sale price of the Common Stock
on the Nasdaq National Market was $16.875 per share.


           SEE "RISK FACTORS" BEGINNING ON PAGE 8 OF THIS PROSPECTUS FOR CERTAIN
FACTORS RELATING TO AN INVESTMENT IN THE COMMON STOCK.


           THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
            SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
             COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION
                OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
                   ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
                         REPRESENTATION TO THE CONTRARY IS
                                A CRIMINAL OFFENSE.

       The  Selling  Stockholders  may from time to time offer and sell all or a
portion of the Offered Shares in transactions on the Nasdaq National Market,  in
the over-the-counter  market, on any other national securities exchange on which
the Common Stock is listed or traded,  in negotiated  transactions or otherwise,
at prices then  prevailing  or related to the  then-current  market  price or at
negotiated  prices. The Offered Shares may be sold directly or through agents or
broker-dealers

<PAGE>

acting as principal or agent,  or in block trades or pursuant to a  distribution
by one or more  underwriters on a firm commitment or best-efforts  basis. To the
extent  required,  the names of any  agents  or  broker-dealers  and  applicable
commissions or discounts and any other required  information with respect to any
particular offer will be set forth in this Prospectus under the caption "Plan of
Distribution"  or an  accompanying  supplement to this Prospectus (a "Prospectus
Supplement").  Each of the Selling Stockholders  reserves the right to accept or
reject,  in whole or in part, any proposed  purchase of the Offered Shares to be
made  directly or through  agents.  The Selling  Stockholders  and any agents or
broker-dealers  participating  in the  distribution of the Offered Shares may be
deemed to be "underwriters" within the meaning of the Securities Act of 1933, as
amended (the "Securities  Act"), and any profit on the sale of Offered Shares by
the  Selling  Stockholders  and any  commissions  received by any such agents or
broker-dealers  may be deemed to be underwriting  commissions or discounts under
the Securities Act.

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


                 The date of this Prospectus is November 13, 1997.

                                       2
<PAGE>
                                 TABLE OF CONTENTS

The Company............................................................... 3

Risk Factors.............................................................. 8

Use of Proceeds...........................................................17

Selling Stockholders......................................................17

Plan of Distribution......................................................19

Experts...................................................................20

Legal Matters.............................................................21

Available Information.....................................................21

Incorporation of Certain Documents By Reference...........................22

Forward-Looking Statements ...............................................23

                                    THE COMPANY

       Orion is a rapidly  growing  provider of  satellite-based  communications
services, focused primarily on (i) private communications network services, (ii)
Internet services and (iii) video distribution and other satellite  transmission
services. Orion provides multinational  corporations with private communications
networks designed to carry high speed data, fax, video  teleconferencing,  voice
and other  specialized  services.  The  Orion  satellite's  ubiquitous  coverage
reaches all locations within its footprint,  enabling the delivery of high speed
data to  customers  in  emerging  markets  and remote  locations  which lack the
necessary infrastructure to support these services. The Company also offers high
speed Internet access and transmission  services to companies outside the United
States  seeking  to avoid  "last  mile"  terrestrial  connections  and to bypass
congested  regional  Internet  network  routes.  In  addition,   Orion  provides
satellite  capacity for video  distribution,  satellite news gathering and other
satellite   services   primarily  to  broadcasters,   news   organizations   and
telecommunications service providers. The Company provides its services directly
to customer premises using very small aperture terminals ("VSATs").

       The  Company  commenced  operations  of  Orion  1, a high  power  Ku-band
satellite,  in January  1995.  As of  September  30,  1997,  Orion  serviced 282
customers  through 635 sites in  service.  As of  September  30,  1997,  Orion's
contract  backlog was $254.1  million  (including $89 million for one pre-launch
customer  on Orion 3).  Substantially  all of  Orion's  current  contracts  with
customers are denominated in U.S.  dollars.  For the nine months ended September
30, 1997,  the Company  generated  revenues of $54.5 million and had a loss from
operations,  net loss,  net cash used in  operating  activities  and  EBITDA (as
defined below) of $30.5 million,  $78.2 million, $17.8 million and $5.3 million,
respectively.  For the year ended  December  31,  1996,  the  Company  generated
revenues of $41.8  million and had a loss from  operations,  net loss,  net cash
used in operating activities and EBITDA of $36.4 million,  $27.2 million,  $21.8
million and $0.6 million,  respectively.  "EBITDA"  represents  earnings  before
minority interests,  interest income,  interest expense, other expense (income),
income  taxes,  depreciation  and  amortization.  EBITDA is commonly used in the
communications   industry  to  analyze  companies  on  the  basis  of  operating
performance,  leverage and  liquidity.  EBITDA is not intended to represent cash
flows from  operating,  investing  or  financing  activities  as  determined  in
accordance  with  GAAP.  EBITDA is not a  measurement  under GAAP and may not be
comparable to other similarly titled measures of other companies.

       The  Company  believes  that  demand for  satellite-based  communications
services will continue to grow due to (i) the expansion of businesses beyond the
limits of wide bandwidth  terrestrial  infrastructure,  (ii) accelerating demand
for high speed data  services,  (iii)  growing  demand for Internet and intranet
services, especially outside the United States, (iv) increased size and scope of
television   programming    distribution,    (v)   worldwide   deregulation   of
telecommunications  markets  and  (vi)  continuing  technological  advancements.
Satellites are able to provide  reliable,  high bandwidth 


                                       3
<PAGE>
services  anywhere in their coverage areas,  and the Company believes that it is
well positioned to satisfy market demand for these services.

       The  Company  launched  Orion 1, a high power  satellite  with 34 Ku-band
transponders,  in  November  1994.  Orion 1  provides  coverage  of 34  European
countries,  much of the  United  States  and parts of  Canada,  Mexico and North
Africa.  Through  arrangements with local ground operators,  Orion currently has
the  ability to deliver  network  services  to and among  points in 27  European
countries,  portions of the United States and a limited number of Latin American
countries.

       In July 1996,  the Company  signed a contract with Matra Marconi Space UK
Limited ("Matra Marconi Space"), which was amended and restated in January 1997,
for the  construction  and  launch  of  Orion 2, its  second  satellite,  and in
February 1997 commenced construction of that satellite. Orion 2, which will be a
high power  satellite  with 30 Ku-band  transponders,  will expand the Company's
European  coverage  and extend  coverage  to  portions  of the  Commonwealth  of
Independent  States,  Latin  America and the Middle East.  Orion 2 will increase
significantly  the  Company's  pan-European  capacity,  currently  the  area  of
strongest  demand for the Company's  services.  The Company  recently  commenced
selling  services in certain areas of Latin America.  Orion 2 is scheduled to be
launched in the second quarter of 1999.

       In  January  1997,  the  Company  entered  into a  satellite  procurement
contract  with  Hughes  Space and  Communications  International,  Inc.  for the
construction  and  launch of Orion 3,  construction  of which was  commenced  in
December  1996.  Orion 3, which will be a high power  satellite  with 33 Ku-band
transponders  and 10 C-Band  transponders,  will cover  broad  areas of the Asia
Pacific region, including China, Japan, Korea, India, Southeast Asia, Australia,
New Zealand,  Eastern  Russia and Hawaii.  Orion 3's footprint  will provide the
Company with the ability to  distribute  programming  from the United States via
Hawaii to most of the Asia  Pacific  region.  The Company  has  already  taken a
number of steps to establish an early market  presence in Asia,  and has entered
into a $89  million  lease  for  eight of  Orion  3's  transponders.  Orion 3 is
scheduled to be launched in the fourth quarter of 1998.

       In the  aggregate,  the  footprints  of Orion 1, Orion 2 and Orion 3 will
cover over 85% of the world's population.

       The Company's  principal  executive  offices are located at 2440 Research
Boulevard,  Rockville,  Maryland  20850,  and  its  telephone  number  is  (301)
258-8101.

PENDING ACQUISITION OF THE COMPANY BY LORAL

       ON OCTOBER 7, 1997, ORION,  LORAL SPACE & COMMUNICATIONS  LTD.  ("LORAL")
AND LORAL  SATELLITE  CORPORATION,  A WHOLLY OWNED  SUBSIDIARY OF LORAL ("MERGER
SUB"),  ENTERED INTO AN AGREEMENT  AND PLAN OF MERGER (THE "MERGER  AGREEMENT"),
PURSUANT  TO WHICH  MERGER SUB WILL MERGE  WITH AND INTO THE  COMPANY,  WITH THE
COMPANY  BEING THE  SURVIVING  CORPORATION  AND THEREBY  BECOMING A WHOLLY OWNED
SUBSIDIARY OF LORAL (THE "MERGER").

       THE  MERGER  AGREEMENT  PROVIDES  THAT (I) EACH  SHARE OF  COMMON  STOCK,
EXCLUDING TREASURY SHARES AND SHARES OWNED BY LORAL OR ITS SUBSIDIARIES, WILL BE
CONVERTED  INTO AND  EXCHANGED FOR THE RIGHT TO RECEIVE THE NUMBER OF FULLY PAID
AND  NONASSESSABLE  SHARES OF COMMON STOCK,  PAR VALUE $.01 PER SHARE,  OF LORAL
("LORAL COMMON STOCK") EQUAL TO THE EXCHANGE  RATIO (AS DESCRIBED  BELOW),  (II)
EACH  SHARE OF THE  COMPANY'S  SERIES  A 8%  CUMULATIVE  REDEEMABLE  CONVERTIBLE
PREFERRED  STOCK  (THE  "SERIES  A  PREFERRED  STOCK"),  SERIES B 8%  CUMULATIVE
REDEEMABLE  CONVERTIBLE  PREFERRED  STOCK (THE  "SERIES B  PREFERRED  STOCK" AND
TOGETHER WITH THE SERIES A PREFERRED  STOCK, THE "SENIOR  PREFERRED  STOCK") AND
SERIES C  PREFERRED  STOCK (THE SERIES C  PREFERRED  STOCK AND SENIOR  PREFERRED
STOCK ARE  HEREINAFTER  REFERRED TO AS THE  "SENIOR  PREFERRED  STOCK")  WILL BE
CONVERTED  INTO AND

                                       4
<PAGE>
EXCHANGED  FOR THE RIGHT TO RECEIVE  THE NUMBER OF FULLY PAID AND  NONASSESSABLE
SHARES OF LORAL  COMMON  STOCK EQUAL TO THE  EXCHANGE  RATIO  MULTIPLIED  BY THE
NUMBER OF SHARES OF COMMON  STOCK INTO WHICH SUCH SHARE OF  PREFERRED  STOCK WAS
CONVERTIBLE  IMMEDIATELY  PRIOR TO THE EFFECTIVE TIME OF THE MERGER,  (III) EACH
OUTSTANDING  STOCK  OPTION TO PURCHASE  SHARES OF COMMON STOCK WILL BE CONVERTED
INTO AN OPTION TO ACQUIRE  THE NUMBER OF SHARES OF LORAL  COMMON  STOCK EQUAL TO
THE EXCHANGE RATIO  MULTIPLIED BY THE NUMBER OF SHARES OF COMMON STOCK FOR WHICH
SUCH  OPTION WAS  EXERCISABLE,  AND (IV) EACH  OUTSTANDING  WARRANT TO  PURCHASE
SHARES OF COMMON STOCK WILL BE CONVERTED INTO A WARRANT TO ACQUIRE THE NUMBER OF
SHARES OF COMMON STOCK EQUAL TO THE EXCHANGE  RATIO  MULTIPLIED BY THE NUMBER OF
SHARES OF COMPANY COMMON STOCK FOR WHICH SUCH WARRANT WAS EXERCISABLE.

       PURSUANT  TO THE TERMS OF THE MERGER  AGREEMENT,  THE  EXCHANGE  RATIO IS
DETERMINED AS FOLLOWS:

       (i) IF THE AVERAGE OF THE VOLUME-WEIGHTED AVERAGE TRADING PRICES OF LORAL
COMMON STOCK FOR THE TWENTY  CONSECUTIVE  TRADING DAYS ON WHICH TRADING OF LORAL
COMMON  STOCK  OCCURS  ENDING THE TENTH  TRADING  DAY  IMMEDIATELY  PRIOR TO THE
CLOSING DATE FOR THE MERGER (THE "DETERMINATION PRICE") IS LESS THAN $24.458 BUT
GREATER THAN $16.305,  THE EXCHANGE  RATIO IS THE QUOTIENT  OBTAINED BY DIVIDING
$17.50 BY THE DETERMINATION PRICE,

       (ii) IF THE DETERMINATION PRICE IS EQUAL TO OR GREATER THAN $24.458,  THE
EXCHANGE RATIO IS 0.71553 AND

       (iii) IF THE  DETERMINATION  PRICE IS EQUAL TO OR LESS THAN $16.305,  THE
EXCHANGE RATIO IS 1.07329.

       THE MERGER IS SUBJECT TO A NUMBER OF  CONDITIONS,  INCLUDING  APPROVAL BY
ORION'S  STOCKHOLDERS,  APPROVAL BY THE FEDERAL  COMMUNICATIONS  COMMISSION  AND
OTHER  REGULATORY  APPROVALS.  ALTHOUGH  NOT A CONDITION  OF THE  MERGER,  ORION
INTENDS TO SEEK AN  INTERNAL  REVENUE  SERVICE  RULING AS TO  ELIGIBILITY  FOR A
TAX-FREE EXCHANGE.

       IN CONNECTION WITH THE MERGER AGREEMENT,  CERTAIN PRINCIPAL  STOCKHOLDERS
OF ORION AND MEMBERS OF ORION'S  MANAGEMENT  HAVE AGREED TO VOTE IN FAVOR OF THE
MERGER AND HAVE GRANTED TO THE LORAL THE RIGHT TO PURCHASE  THEIR  SECURITIES IN
ORION FOR A PRICE EQUAL TO THE MERGER CONSIDERATION UNDER CERTAIN CIRCUMSTANCES.
THE COMPANY EXPECTS THE MERGER TO BE CONSUMMATED BY THE FIRST QUARTER OF 1998.

       THE  FOREGOING   DESCRIPTIONS  OF  THE  MERGER  AGREEMENT  AND  PRINCIPAL
STOCKHOLDER  AGREEMENT  WITH  LORAL DO NOT  PURPORT TO BE  COMPLETE.  THE MERGER
AGREEMENT AND PRINCIPAL  STOCKHOLDER  AGREEMENT  HAVE BEEN FILED AS EXHIBITS 2.1
AND 2.2, RESPECTIVELY,  TO COMPANY'S CURRENT REPORT ON FORM 8-K DATED OCTOBER 9,
1997, AND ARE INCORPORATED HEREIN BY REFERENCE.

OTHER RECENT DEVELOPMENTS

PRE-CONSTRUCTION LEASE ON ORION 3

       Orion  has  entered  into  a  contract   with  DACOM   Corp.,   a  Korean
communications  company  ("DACOM"),  under which DACOM will,  subject to certain
conditions,  lease  eight  dedicated  transponders  on Orion 3 for 13 years,  in
return for approximately  $89 million,  payable over a period from December 1996
through seven months following the lease  commencement date for the transponders
(which is  scheduled to occur by January  1999).  Payments are subject to refund
unless Orion 3 commences commercial operation by June 30, 1999.




                                        5

<PAGE>
ACQUISITION OF TELPORT EUROPE GMBH

       On March 26, 1997,  Orion acquired  Teleport  Europe GmbH (whose name was
subsequently  changed to Orion Network  Systems-Europe GmbH) ("Orion Europe"), a
German  communications  company  specializing in private satellite  networks for
voice and data services.  Orion purchased the shares of Orion Europe held by two
German companies,  Vebacom GmbH and RWE Telliance AG, now known as o.tel.o., for
$8.9 million.  Orion Europe's 1996 revenues were approximately $14 million.  The
acquisition  expanded  Orion's  customer  base by  approximately  55  customers,
including some of Germany's leading multinational  corporations,  and added over
200 network service sites (exclusive of broadcast  service sites).  In addition,
Orion  acquired  Orion  Europe's  licenses and  operating  agreements to provide
satellite  network  services in 40  countries,  including  17 countries in which
Orion previously did not provide service.

JANUARY 1997 TRANSACTIONS

       In January  1997,  Orion  consummated a series of  transactions  that are
described briefly below,  including the Exchange,  the January Merger,  the Bond
Offering and the Debentures Offering (each as defined below), the acquisition of
the remaining  minority interest in a subsidiary and certain uses of proceeds of
the offerings (collectively, the "January 1997 Transactions"),  all as described
more  fully  in Note 9 to the  Consolidated  Financial  Statements  incorporated
herein by reference  from the Company's  Annual Report on Form 10-K for the year
ended December 31, 1996 and amendment thereto on Form 10-K/A dated June 25, 1997
(together, the "1996 Form 10-K").

       THE  EXCHANGE.  On January  31,  1997,  the Company  acquired  all of the
limited  partnership  interests  which it did not already  own in the  Company's
operating  subsidiary,   Orion  Atlantic,  that  owns  the  Orion  1  satellite.
Specifically,  pursuant  to  a  Section  351  Exchange  Agreement  and  Plan  of
Conversion (the "Exchange  Agreement"),  the Company acquired the Orion Atlantic
limited partnership  interests and other rights relating thereto held by 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. (collectively,
the "Exchanging  Partners").  The Exchanging Partners exchanged (the "Exchange")
their Orion  Atlantic  limited  partnership  interests for 123,172 shares of the
Company's  Series C Preferred  Stock. In addition,  the Company acquired certain
rights  held by certain of the  Exchanging  Partners  to  receive  repayment  of
various advances (aggregating  approximately $41.6 million at January 31, 1997).
The  123,172  shares of Series C  Preferred  Stock  issued in the  Exchange  are
convertible  into  approximately 7 million shares of the Company's Common Stock.
As a result of the Exchange, certain of the Exchanging Partners became principal
stockholders of the Company.

       THE JANUARY  MERGER.  The Exchange was  conducted on a tax-free  basis by
means of the January Merger  (defined below) that was consummated on January 31,
1997. Pursuant to the Exchange Agreement,  Orion Oldco Services,  Inc., formerly
known as Orion Network Systems, Inc. ("Old Orion"),  formed the Company as a new
Delaware  corporation  with a certificate of  incorporation,  bylaws and capital
structure  substantially  identical in all material  respects  with those of Old
Orion.  Also  pursuant to the Exchange  Agreement,  the Company  formed a wholly
owned  subsidiary,  Orion Merger  Company,  Inc.  ("Orion  Merger  Subsidiary").
Pursuant to an Agreement and Plan of Merger,  Orion Merger Subsidiary was merged
with and into Old Orion,  and Old Orion became a wholly owned  subsidiary of the
Company (the "January  Merger").  On January 31, 1997, the effective time of the
January  Merger,  all of the  stockholders  of Old Orion  received  stock in the
Company  with  substantially  identical  rights to the Old Orion stock they held
prior to the effective time of the January Merger. Following the January Merger,
the Company  changed its name from Orion Newco  Services,  Inc. to Orion Network
Systems, Inc. and the Company's wholly owned subsidiary,  Orion Network Systems,
Inc., changed its name to Orion Oldco Services, Inc.


                                       6
<PAGE>
       BOND OFFERING AND DEBENTURES  OFFERING.  On January 31, 1997, the Company
completed the $710 million Bond Offering  composed of 445,000 Senior Note Units,
each of which consists of one 11 1/4% Senior Note due 2007 (a "Senior Note") and
one Senior Note Warrant to purchase  0.8463 shares of Common Stock,  and 484,000
Senior  Discount  Note  Units,  each of  which  consists  of one 12 1/2%  Senior
Discount Note due 2007 (a "Senior  Discount  Note," and together with the Senior
Notes,  the "Notes") and one Warrant to purchase  0.6628 shares of Common Stock.
Interest on the Senior Notes is payable  semi-annually in cash on January 15 and
July 15 of each year, commencing July 15, 1997. The Senior Discount Notes do not
pay cash interest prior to January 15, 2002.  Thereafter,  cash interest will be
payable  semi-annually  on January 15 and July 15 of each year,  commencing July
15, 2002.

       On January 31, 1997,  the Company also  completed the sale of $60 million
of its Debentures to two investors,  British Aerospace Holdings,  Inc. ("British
Aerospace") and Matra Marconi Space.  British Aerospace purchased $50 million of
the Debentures  and Matra Marconi Space  purchased $10 million of the Debentures
(collectively, the "Debentures Offering").

       The Company used a portion of the net  proceeds of the Bond  Offering and
Debentures  Offering  primarily  to repay  the  Orion 1 credit  facility  and to
pre-fund  the first three years of interest  payments on the Senior  Notes.  The
Company  plans to use the balance of such net  proceeds  primarily  to build and
launch Orion 2 and Orion 3.







                                       7
<PAGE>
                                   RISK FACTORS

       In addition to the other  information  contained in this Prospectus,  the
following factors should be considered  carefully in evaluating an investment in
the Common Stock, which involves a high degree of risk.  Statements contained in
this Prospectus and in the documents  incorporated herein by reference regarding
Orion's  expectations  with respect to Orion 2 and Orion 3, related  financings,
future operations and other  information,  which can be identified by the use of
forward-looking  terminology,  such as "may,"  "will,"  "expect,"  "anticipate,"
"estimate," or "continue" or the negative thereof or other variations thereon or
comparable  terminology,  are  forward-looking  statements within the meaning of
Section  27A of the  Securities  Act and Section 21E of the  Exchange  Act.  See
"Forward-Looking   Statements."  The  discussions  set  forth  below  constitute
cautionary  statements  identifying  important  factors  with  respect  to  such
forward-looking  statements,  including  certain risks and  uncertainties,  that
could cause actual results to differ  materially from results referred to in the
forward-looking statements.  There can be no assurance that Orion's expectations
regarding any of these matters will be fulfilled. The forward-looking statements
are  made  as of the  date of  this  Prospectus,  and  the  Company  assumes  no
obligation to update the forward-looking statements or to update the reasons why
actual  results  could  differ  from  those  projected  in such  forward-looking
statements.

ACQUISITION:  NO ASSURANCE THAT LORAL ACQUISITION WILL BE CONSUMMATED

       The  consummation  of the Merger is  subject  to a number of  conditions,
including  approval  of the  Merger  Agreement  by the  Company's  stockholders,
approval  by  the  Federal  Communications   Commission,   expiration  of  early
termination  of  the  waiting  period  under  the  Hart-Scott-Rodino   Antitrust
Improvements  Act of  1976,  accuracy  of  representations  and  warranties  and
compliance  with  covenants set forth in the Merger  Agreement.  It is presently
anticipated that each of the conditions to the Merger would have to be satisfied
to consummate  the Merger.  There can be no assurance that Orion will obtain all
necessary  approvals and satisfy all other  conditions  to the Merger.  See "The
Company--Pending Acquisition of the Company by Loral."

LIMITED OPERATIONS; HISTORY OF LOSSES, EXPECTATION OF FUTURE LOSSES

       From its  inception  in 1982  through  January  20,  1995,  when  Orion 1
commenced  commercial  operations,   Orion  was  a  development  stage  company.
Accordingly,  Orion has limited  experience  operating its  business.  Orion has
experienced  net losses in each fiscal year since its  inception,  including net
losses of  approximately  $26.9 million and $27.2 million  during 1995 and 1996,
respectively.  On  a  pro  forma  basis,  giving  effect  to  the  January  1997
Transactions, the Company would have had a net loss of $145.7 million and $133.6
million for 1995 and 1996, respectively. The increase in net loss on a pro forma
basis is  associated  with the  depreciation  on the step up in the basis of the
Orion 1 satellite and the  amortization of excess cost over fair value resulting
from the acquisition of the Exchanging Partners'  partnership interests in Orion
Atlantic in the  Exchange,  the net increase to interest  expense as a result of
the January 1997  Transactions,  and the  elimination of minority  interest as a
result of the Exchange.  See Note 9 to the Consolidated  Financial Statements of
the Company  included in the Company's 1996 Form 10-K. Orion also had a net loss
of  $78.2  million  during  the  nine  months  ended  September  30,  1997.  The
implementation  of Orion's  business plan regarding Orion 2 and Orion 3 requires
substantial  capital for the  construction,  launch,  insurance,  financing  and
start-up  costs of those  satellites.  A substantial  portion of these costs has
been financed with  indebtedness,  which will  substantially  increase  interest
costs. The Company's negative cash flow (after payments for capital expenditures
and interest) has been substantial and net losses and negative cash flows (after
payments for capital  expenditures  and  interest) are expected to increase over
the next few years.


                                       8
<PAGE>
CAPITAL INTENSIVE BUSINESS; NEED FOR ADDITIONAL CAPITAL

       Based upon its current  expectations for growth, the Company  anticipates
it will have substantial funding  requirements over the next three years to fund
the  costs  of Orion 2 and  Orion  3,  the  purchase  of  VSATs,  other  capital
expenditures and other capital needs. The Company has pre-funded the first three
years of interest  payments on the Senior  Notes out of the net  proceeds of the
Bond Offering.

       The in-orbit  delivered  costs of the Orion 2 and Orion 3 satellites  are
expected  to  aggregate   approximately   $540  million.   In  addition  to  the
approximately $85 million incurred through the third quarter of 1997, Orion will
need to make payments of approximately $17 million, $350 million and $50 million
in the remainder of 1997, 1998 and 1999, respectively. These amounts include the
Company's  estimate  regarding the cost of launch insurance based on discussions
with potential insurers, although the Company has not received any commitment to
provide  insurance.  The  contracts  for Orion 2 and Orion 3 provide  firm fixed
prices for the  construction  and launch of those  satellites  and  provide  for
penalties in event of late delivery by the manufacturer;  however, the Company's
actual payments could be  substantially  higher due to any change orders for the
satellites, insurance rates, delays and other factors.

       The Company  anticipates  that its  existing  cash  balances and payments
under the DACOM  contract will be sufficient  to meet  substantially  all of its
capital  requirements  for the  delivery  in orbit  of  Orion 2 and  Orion 3. In
connection  with the Bond Offering,  the Company  segregated $273 million of the
net proceeds to make  payments for  additional  satellites  and certain  related
costs (or to pay  interest  and  principal  on the Notes).  The Company can also
apply to such  uses a portion  of its  working  capital  of  $109.2  million  at
September 30, 1997.  However,  there can be no assurance that cost increases for
Orion 2 and/or Orion 3 due to change  orders,  insurance  rates or  construction
delays, among other factors, may not increase the Company's capital requirements
or that the Company's  growth may not vary from its  expectations,  resulting in
changes in its cash requirements or expected cash position.

       The balance of the Company's funding  requirements are dependent upon its
growth and cash flow from  operations.  The Company cannot  predict  whether its
existing  resources  and cash flows will be  adequate  to cover its future  cash
needs.  If existing  resources  and cash flows are not  sufficient  to cover the
Company's  future  cash  needs,  the  Company  will  need  to  raise  additional
financing. The Company does not have a revolving credit facility or other source
of readily available  capital.  Sources of additional capital may include public
or private debt, equity financings or strategic investments.  To the extent that
the Company seeks to raise additional debt financing, the Notes indentures limit
the  amount of such  additional  debt the  Company  may incur and  prohibit  the
Company from using Orion 1, Orion 2 or Orion 3 as  collateral  for  indebtedness
for money  borrowed.  Moreover,  the  Company's  ability to raise public  equity
financing  may be limited by the  registration  rights it has granted to certain
investors. See "-- Potential Adverse Effect of Shares Eligible for Future Sale."
If the Company requires  additional  financing and is unable to obtain financing
from outside  sources in the amounts and at the times  needed,  there would be a
material adverse effect on the Company and the value of the Common Stock.

       The  foregoing  estimates of capital needs do not include any amounts for
other possible financing  requirements.  The Company may from time to time enter
into joint ventures and make  acquisitions  of  complementary  businesses and is
often engaged in discussions or negotiations with regard to such potential joint
ventures and acquisitions.  Such joint ventures or acquisitions would need to be
financed,  which would increase the Company's need for  additional  capital.  In
addition,  Orion  intends  to  replace  Orion  1 at the end of its  useful  life
(expected  to  be  in  October  2005).  Such  replacement  likely  will  require
additional  financing if the cash flow from Orion's operations is not sufficient
to fund a replacement satellite.

                                       9
<PAGE>
SUBSTANTIAL LEVERAGE; SECURED INDEBTEDNESS

       As of  September  30, 1997,  Orion had  approximately  $790.6  million of
long-term  indebtedness,  and was highly  leveraged.  The  accretion of original
issue discount on the Senior Discount Notes will substantially  increase Orion's
liabilities.  The Company has deposited  approximately $134 million in a pledged
account to pre-fund the first six  scheduled  payments of interest on the Senior
Notes.  However, the Company will need to service the cash interest expense on a
very  substantial  amount  of  indebtedness  (including  the  Notes)  with  cash
generated by its  operations.  For the nine months ended September 30, 1997, the
Company  had EBITDA of $5.3  million  and  interest  expense  of $62.3  million,
respectively.

       The level of the Company's indebtedness could have important consequences
to holders of Common  Stock,  including  the  following:  (i) the ability of the
Company  to  obtain  any   necessary   financing   in  the  future  for  capital
expenditures,  working capital,  debt service requirements or other purposes may
be  limited;  (ii)  a  substantial  portion  of the  Company's  cash  flow  from
operations,  if any,  must be  dedicated  to the  payment  of  principal  of and
interest on its indebtedness and other obligations and will not be available for
use in the Company's  business;  (iii) the Company's level of indebtedness could
limit its  flexibility in planning for, or reacting to changes in, its business;
(iv) the Company  will be more highly  leveraged  than some of its  competitors,
which may place it at a competitive  disadvantage;  and (v) the  Company's  high
degree  of  indebtedness  will  make it more  vulnerable  to a  default  and the
consequences  thereof (such as bankruptcy workout) in the event of a downturn in
its business.

RISKS OF SATELLITE LOSS OR REDUCED PERFORMANCE

       Satellite  Loss  or  Reduced  Performance.   Satellites  are  subject  to
significant  risks,  including  launch failure,  damage that impairs  commercial
performance, failure to achieve correct orbital placement during launch, loss of
fuel that reduces satellite life, and satellite in-orbit risks. Although Orion 1
has been  successfully  launched and is in  commercial  operation,  and although
Orion maintains  satellite  in-orbit  insurance on Orion 1, any loss in orbit or
reduced performance of Orion 1 would have a material adverse effect on Orion. In
addition,  no assurance  can be given that the launch of Orion 2 or Orion 3 will
be successful.  Although various sources of data permit  differing  conclusions,
Orion is aware of  sources  indicating  that the  historical  loss  rate for all
commercial geosynchronous satellite launches may be as high as 15%. Launch risks
vary based upon the launch  vehicle used.  The Delta III launcher to be used for
Orion 3 is new and has no significant launch history.  Even though the Delta III
is based upon earlier Delta launch  vehicles,  the new technology  used in Delta
III could affect its launch success rate. A Delta II launch vehicle  exploded on
January 17, 1997.

       Orion may have to change  launch  vehicles and could be subject to delays
and higher  costs of launch  insurance  if,  for  example,  one of its  selected
vehicles experiences a launch failure with respect to another satellite. In such
event,  delays in the launch of one of Orion's  satellites could result from the
manufacturer's  need to  investigate  the  reasons for the failure of the launch
vehicle and address any design or manufacturing concerns that are identified. It
is not  possible to predict  the  duration of any such  potential  delays.  With
respect to the risk of launch failure of Orion's satellites, Orion has an option
to  purchase  an  additional  satellite  (which  may be  used  as a  replacement
satellite) to be delivered in orbit, in the case of Orion 3, within 12, 15 or 19
months (at Orion's  election) after it exercises the option,  or, in the case of
Orion 2,  within 21 1/4 months  after it  exercises  the option.  Therefore,  an
unsuccessful  launch of Orion 2 or Orion 3 would involve a delay in revenues for
at least  one  year,  and  perhaps  substantially  longer.  Any loss or delay of
revenue  from any of the  Company's  satellites  would have a  material  adverse
effect on the Company and the value of the Common Stock.

       In  November  1995,  one  of  Orion  1's   components   supporting   nine
transponders of dedicated  capacity  serving the European portion of the Orion 1
footprint   experienced  an  anomaly  that  resulted

                                       10
<PAGE>
in a temporary  service  interruption,  lasting  approximately  two hours.  Full
service to all affected customers was restored using redundant  equipment on the
satellite. These transponders currently generate a majority of Orion's revenues.
Orion  believes,  based  on the  data  received  to date by  Orion  from its own
investigations  and from the  manufacturer,  and based upon advice from  Orion's
independent engineering  consultant,  Telesat Canada, that because the redundant
component  is  functioning  fully  in  accordance  with  specifications  and the
performance  record of similar  components is strong,  the anomalous behavior is
unlikely to affect the expected  performance  of the  satellite  over its useful
life.  Furthermore,  there has been no  further  effect on  Orion's  ability  to
provide  services  to  customers.  However,  in the  event  that  the  currently
operating component fails, Orion 1 would experience a significant loss of usable
capacity.  In such event, while Orion would be entitled to insurance proceeds of
approximately $47 million and could lease replacement capacity and function as a
reseller with respect to such capacity (at substantially reduced gross margins),
the loss of capacity would have a material adverse effect on the Company and the
value of the Common Stock.

       Limited  Insurance  for  Satellite  Launch and  Operation.  The  in-orbit
insurance of Orion 1 and the launch and in-orbit insurance for Orion 2 and Orion
3 will not protect the Company against business  interruption,  loss or delay of
revenues  and  similar  losses and may not fully  reimburse  the Company for its
expenditures. In addition, such insurance includes or can be expected to include
certain contract terms,  exclusions,  deductibles and material change conditions
that are customary in the industry. Accordingly, an unsuccessful launch of Orion
2 or Orion 3 or any significant  loss of performance  with respect to any of its
satellites  would have a material  adverse  effect on Orion and the value of the
Common  Stock.   Although  Orion  has  obtained  a  commitment   from  insurance
underwriters  to  provide  launch  insurance  for the  construction,  launch and
insurance  costs of Orion 2 and Orion 3,  Orion has not yet  received  insurance
policies.  There can be no assurance that the terms and exclusions in the actual
insurance policies will be favorable to the Company.

       Limited Life of Satellites.  While Orion 1 is expected to have an orbital
life of approximately 10.7 years (through October 2005), and Orion 2 and Orion 3
are  expected  to have  orbital  lives of  approximately  13 years and 15 years,
respectively,  there  can be no  assurance  as to the  actual  longevity  of the
satellites.  A number of factors will affect the useful life of each  satellite,
including the rate of fuel  consumption in achieving  correct orbital  placement
during  launch,  the  quality  of its  construction  and the  durability  of its
component  parts.   There  is  a  significant   possibility  that  one  or  more
transponders   on  a  satellite  may  cease  to  function  in  accordance   with
specifications  during its estimated  useful life and there is no assurance that
service could be restored through  redundant  transponders.  In addition,  while
Orion plans to replace each  satellite at the end of its useful life,  there can
be no assurance that the required  financing and  regulatory  approvals to do so
will be available.

LAUNCH OF ORION 2 AND ORION 3 SUBJECT TO SIGNIFICANT UNCERTAINTIES

       Cost  Uncertainties.   Based  on  the  current  designs  of  and  current
construction  schedules  for Orion 2 and Orion 3, the total costs of Orion 2 and
Orion 3, including construction,  launch, launch insurance,  financing costs and
start-up expenses,  are presently estimated to be approximately $265 million and
$275 million, respectively. These costs may increase as a result of changes that
may occur during the  construction of the satellites or if the cost of insurance
exceeds the Company's  expectations.  There can be no assurance  that the actual
costs of these  satellites will not be materially  greater than these estimates.
To the extent that actual costs are materially greater than expected, completion
of Orion 2 and Orion 3 will likely  require  substantial  additional  financing.
Failure to raise such  financing  would have a material  adverse effect on Orion
and the value of the Common Stock.

       Timing  Uncertainties.  Orion  presently  plans to launch  Orion 2 in the
second  quarter  of 1999 and plans to launch  Orion 3 in the  fourth  quarter of
1998,  based  upon  the  construction  and  launch  schedules  set  forth in the
satellite  contracts.  To meet  these  schedules,  Orion  must  receive  certain


                                       11
<PAGE>
regulatory  approvals,  finalize the satellite  designs and take other necessary
steps.  Failure to meet the construction and launch schedules could increase the
cost of Orion 2 or Orion 3, requiring additional financing. Although the Orion 2
satellite contract and the Orion 3 satellite contract are fixed-price  contracts
with firm  schedules  for  construction,  delivery  and launch,  there can be no
assurance  that increases in costs due to change orders or delay will not occur.
There can be no assurance  that the launch of Orion 2 or Orion 3 will take place
as scheduled. Delays in launching satellites are quite common, and a significant
delay in the  delivery  or  launch of Orion 2 or Orion 3 would  have a  material
adverse  effect on Orion's  marketing plan for such  satellites,  its ability to
generate revenue and service its indebtedness and the value of the Common Stock.

       Risks of Proceeding With  Construction  Prior to Obtaining all Regulatory
Approvals for Orion 2 and Orion 3. Orion has commenced  construction  of Orion 2
and  Orion  3  prior  to  completion  of  the  required  consultation  with  the
International  Telecommunications  Satellite  Organization  ("INTELSAT") and the
European regional satellite facilities  consortium  ("EUTELSAT") (in the case of
Orion  2),  receipt  of final  authority  from the U.S.  Federal  Communications
Commission  (the  "FCC")  (in  the  case  of  Orion  2)  and  completion  of the
International  Telecommunication Union ("ITU") coordination process.  Failure to
obtain one or more  necessary  approvals in a timely  manner would likely have a
material  adverse effect on the Company.  See "Approvals  Needed;  Regulation of
Industry" below.

RISKS RELATING TO POTENTIAL LACK OF MARKET ACCEPTANCE AND DEMAND; GROUND 
OPERATIONS

       Orion's success will depend in part on the continued growth in demand for
international  private network  services,  which to date have not been a primary
focus of satellite  companies,  and on Orion's  ability to market such  services
effectively.  Marketing will be critical to Orion's success.  However, Orion has
limited  experience in marketing,  having  commenced full commercial  operations
only in 1995. Orion's marketing program until recently consisted of direct sales
using  a  U.S.-based  sales  force,  and  indirect  sales  channels,   including
Exchanging  Partner  sales  representatives,  for sales in Europe.  During 1996,
certain of Orion's indirect sales channels in Europe did not meet  expectations,
and Orion has supplemented  its sales in Europe by significantly  increasing its
direct  sales  capabilities  in Europe,  particularly  with  respect to sales of
private network services,  through expansion of its sales force and acquisitions
such as the  purchase of Orion  Europe in March 1997.  However,  there can be no
assurance  that  this  effort  will be  successful.  Sales of  Orion's  services
generally involve a long-term,  complex sales process, and new contract bookings
will  vary from  quarter  to  quarter.  In  addition,  as an early  provider  of
international   network   services   using  VSATs,   Orion  is  subject  to  the
uncertainties  associated  with  the  development  of  new  services,  including
uncertainties regarding customer interest in and acceptance of higher data speed
communications, the need to develop and convince customers of the attractiveness
of new applications,  and customer  acceptance of the ability of Orion (as a new
market  entrant)  to provide  service.  In  addition,  Orion's  operations  will
continue to depend significantly on Orion's ability to provide ground operations
for private network services using ground operators  throughout the footprint of
Orion's  satellites.  In the event that its network of ground  operators  is not
maintained  and  expanded or fails to perform as  expected,  Orion's  ability to
offer private network services will be impaired.

RISKS CONCERNING ABILITY TO MANAGE GROWTH

       The Company's future  performance will depend,  in part, upon its ability
to manage its growth effectively, which will require it to continue to implement
and improve its marketing,  operating,  financial and accounting  systems and to
expand, train and manage its employee base and manage its relationships with its
local  ground  operators.  For  example,  Orion is in the  process of seeking to
integrate  a  significant   number  of  newly  hired  direct  sales   personnel.
Furthermore,  the  Company may from time to time enter into joint  ventures  and
acquire  complementary  businesses  and  is  often  engaged  in  discussions  or
negotiations with regard to such potential joint ventures and acquisitions. Such
joint ventures and acquired  businesses,  such as Orion Europe, would need to be

                                       12
<PAGE>
integrated  with the  Company,  which  would place an  additional  burden on the
Company's  internal  systems  and its  ability to manage its  employees  and its
relationships  with its local  ground  operators.  In  addition,  the  Company's
ability to attract new orders is subject to substantial  variations from quarter
to quarter.  If the Company fails either to expand in accordance  with its plans
or to manage its growth effectively, there could be a material adverse effect on
its business,  growth,  financial  condition  and results of operations  and the
value of the Common Stock.

POTENTIAL ADVERSE EFFECTS OF COMPETITION

       The international  telecommunications  industry is highly competitive. In
providing  international   telecommunications   services,  Orion  competes  with
established  satellite and other transmission  facilities  providers,  including
INTELSAT, EUTELSAT, PanAmSat and consortia of major telephone carriers operating
undersea  fiber  optic  cables.   In  addition,   Orion  competes  with  certain
established  telephone  carriers,  such as AT&T, MCI,  Sprint,  British Telecom,
Cable & Wireless, Deutsche Telekom, France Telecom and Kokusai Denshin Denwa, as
well as resellers of satellite capacity, such as companies similar to Impsat, in
providing  private network  communications  services.  Many of these competitors
have  significant  competitive  advantages,   including  long-standing  customer
relationships,  close ties with regulatory authorities, control over connections
to local telephone lines and the ability to subsidize  competitive services with
revenues from services they provide as a dominant or monopoly  carrier,  and are
substantially  larger  than  Orion  and have  financial  resources,  experience,
marketing  capabilities and name recognition that are substantially greater than
those of Orion.  The Company  believes  that  competition  in emerging  markets,
particularly  with  respect to  private  network  services,  will  intensify  as
dominant and monopoly long distance providers adapt to a competitive environment
and large carriers  increase  their presence in these markets.  The Company also
believes that  competition  in more  developed  markets will  intensify as large
carriers consolidate,  enhance their international  alliances and increase their
focus on private network  services.  For example,  the possible merger involving
MCI.  The ability of Orion to compete  with these  organizations  will depend in
part on Orion's  ability to price its  services  at a  significant  discount  to
terrestrial  service providers,  its level of customer support and service,  and
the technical advantages of its systems.

       The  services  provided by the Company  have been  subject to  decreasing
prices over recent years and this pricing  pressure is expected to continue (and
may  accelerate)  for the  foreseeable  future.  Orion will need to increase its
volume of sales in order to compensate for such price reductions. Orion believes
that customers will increase the data speeds in their communications networks to
support new applications, and that such upgrading of customer networks will lead
to  increased  revenues  that will  mitigate  the  effect  of price  reductions.
However,  there can be no assurance that this will occur.  In addition,  a large
portion of satellite capacity globally is currently used for video distribution.
As an increasing  portion of satellite  capacity is used for  providing  private
network  services,  prices for these  services may decline.  Compressed  digital
video ("CDV"), which substantially  increases transmission capacity per channel,
is beginning to be used for video  distribution.  As CDV becomes more prevalent,
the supply of effective video capacity could increase significantly, which could
result in lower prices.

       The Company is aware of a substantial  number of new satellites  that are
in construction or in the planning  stages.  Most of these satellites will cover
areas within the footprint of Orion 1 and/or the proposed  footprints of Orion 2
and Orion 3. As these new  satellites  (other than  replacement  satellites  not
significantly larger than the ones they replace) commence operations,  they will
substantially increase the capacity available for the provision of services that
compete with the Company's  services.  After a satellite  has been  successfully
delivered in orbit,  the variable cost of  transmitting  additional data via the
satellite is limited.  Accordingly,  absent a corresponding  increase in demand,
this new  capacity  can be expected to result in  significant  additional  price


                                       13
<PAGE>
reductions.  Continued price  reductions could have a material adverse effect on
Orion and the value of the Common Stock.

APPROVALS NEEDED; REGULATION OF INDUSTRY

       Telecommunications  Regulatory  Policy.  Orion  is  subject  to the  U.S.
Communications  Act  of  1934,  as  amended  (the  "Communications   Act"),  and
regulation  by the FCC (and,  to a limited  extent,  by the U.S.  Department  of
Commerce) and by the national and local governments of other countries.  The FCC
regulates terms and conditions of communications services, including among other
things changes in control or assignment of licenses.  The business  prospects of
Orion  could be  adversely  affected by the  adoption  of new laws,  policies or
regulations,  or changes in the  interpretation or application of existing laws,
policies  or  regulations,  that modify the present  regulatory  environment  or
conditions  of the licenses  granted by the FCC and the Republic of the Marshall
Islands to Orion.

       Additional Regulatory Approvals Needed. The launch and operation of Orion
2 and  Orion  3 will  require  a  number  of  additional  regulatory  approvals,
including the following: (i) approvals of the FCC (in the case of Orion 2); (ii)
completion of successful  consultations  with INTELSAT and, in the case of Orion
2, with EUTELSAT;  (iii)  satellite  "landing"  rights in countries that are not
INTELSAT  signatories or that require additional  approvals to provide satellite
or VSAT services;  and (iv) other regulatory approvals.  Obtaining the necessary
licenses and approvals  involves  significant  time and expense,  and receipt of
such   licenses  and  approvals   cannot  be  assured.   Although  the  FCC  has
conditionally  authorized  the  construction,  launch and  operation  of Orion 2
(subject to  completion  of an INTELSAT  consultation  and  required  showing of
ability to finance the  construction,  launch and  operation for one year of the
satellite,  which  requirements  generally  must  be  satisfied  for  final  FCC
authorization of all FCC satellite  licenses),  and Orion will apply for certain
other approvals for Orion 2 and Orion 3, the FCC  authorization  for Orion 2 has
not become final (since Orion has not yet satisfied the  conditions) and most of
the other requisite approvals have not yet been obtained. Failure to obtain such
approvals  would  have a material  adverse  effect on Orion and the value of the
Common Stock. In addition,  Orion is required to obtain  approvals from numerous
national  and  local  authorities  in the  ordinary  course of its  business  in
connection with most  arrangements  for the provision of services.  Within Orion
1's  footprint,  many of such  approvals  generally  have not been difficult for
Orion to  obtain  in a timely  manner,  but the  failure  to  obtain  particular
approvals has delayed, and in the future may delay, the provision of services by
Orion. The Orion 1 license from the FCC expires in January 2005.  Although Orion
has no reason to believe that its licenses  will not be renewed (or new licenses
obtained) at the  expiration of the license  term,  there can be no assurance of
renewal.  In addition,  Orion will need to comply with the national laws of each
country in which it provides  services.  Laws with respect to satellite services
are currently unclear in certain jurisdictions,  particularly within the Orion 3
footprint.  In certain of these  jurisdictions,  satellite  services may only be
provided via domestic  satellites.  The Company  believes  that certain of these
restrictions  may change and that it can structure its operations to comply with
the remaining restrictions. However, there can be no assurance in this regard.

       ITU Coordination  Process.  An  international  treaty to which the United
States and the Republic of the Marshall  Islands  (through which the Company has
applied for the Orion 3 orbital slot) are parties  requires ITU  coordination of
satellite  orbital slots.  Various  non-U.S.  governments or  telecommunications
authorities have commenced  coordination  procedures pursuant to ITU regulations
for proposed  satellites at orbital locations and in frequency bands that are in
close  proximity to those proposed for Orion 2 and Orion 3. Existing  satellites
and any proposed  satellites that are launched prior to Orion 2 and Orion 3 will
effectively  have priority  over Orion's  satellites.  Orion's  proposed use for
Orion 2 and Orion 3 conflicts  to some  extent  with the use or proposed  use of
certain  existing  or proposed  satellites.  While  Orion  believes  that it can
successfully  coordinate  the use of the orbital  locations and frequency  bands
proposed  for Orion 2 and Orion 3, there can be no assurance  that  coordination
will be achieved.  The Company has commenced construction of Orion 2 and Orion 3
prior to completion of ITU  coordination  and there can be no assurance that ITU

                                       14


<PAGE>
coordination will be completed. In the event that successful coordination cannot
be achieved,  Orion may have to modify the satellite design for Orion 2 or Orion
3 in order to  minimize  the  extent of any  potential  interference  with other
proposed  satellites using those orbital  locations or frequency bands. Any such
modifications  could increase the cost or delay the launch of the satellites (if
significant changes to the satellite are required) and may result in limitations
on the use of one or more transponders on Orion 2 or Orion 3, which could affect
the amount of revenue realized from such  transponders.  If interference  occurs
with  satellites  that  are in  close  proximity  to Orion 2 or Orion 3, or with
satellites  that are  subsequently  launched into  locations in close  proximity
before completion of ITU coordination  procedures,  such interference would have
an adverse effect on the proposed use of the satellites and on Orion's  business
and financial performance. Orion cannot predict the extent of any adverse effect
on Orion from any such occurrences.

UNCERTAINTIES RELATING TO BACKLOG

       The  Company's  current  backlog  consists  of a mix of large  and  small
contracts  for private  communications  networks and  transmission  capacity for
video and other  satellite  transmission  services  with a variety of customers.
Although many of the Company's  customers,  especially customers under large and
long-term   contracts,   are  large  corporations  with  substantial   financial
resources, other contracts are with companies that may be subject to business or
financial risks affecting  their credit  worthiness.  If customers are unable or
unwilling to make required  payments,  the Company may be required to reduce its
backlog  figures  (which would  result in a reduction in future  revenues of the
Company), and such reductions could be substantial.  In 1996, the Company had to
remove from its backlog  significant  contracts with customers.  Orion presently
anticipates that  approximately $18 million of its $254.1 million in backlog (as
of  September  30,  1997) will be realized  during the  remainder  of 1997.  The
Company's  contracts  commence and  terminate on fixed dates.  If the Company is
delayed in commencing service or does not provide the required service under any
particular contract, as it has occasionally done in the past, it may not be able
to  recognize  all the  revenue it  initially  includes  in  backlog  under that
contract.  In addition,  the current  backlog  contains  some  contracts for the
useful life of Orion 1; if the useful life of Orion 1 is shorter than  expected,
some portion of backlog may not be realized unless services  satisfactory to the
customer can be provided over another satellite.

TECHNOLOGICAL CHANGES

       Although Orion believes that Orion 1 does employ, and Orion 2 and Orion 3
will employ, advanced technologies, the telecommunications industry continues to
experience  substantial  technological  changes. The Company believes that there
are numerous  telecommunications  companies that are seeking ways to improve the
data  transmission  capacity of the  existing  terrestrial  infrastructure.  Any
significant  improvement of such capacity,  particularly  with respect to copper
wire, would have a material  adverse effect on Orion.  There can be no assurance
that  other  changes  will  not  adversely  affect  the  prospects  or  proposed
operations or expenses of Orion.

RISKS OF CONDUCTING INTERNATIONAL BUSINESS

       The Company's  international  service contracts are generally denominated
in  U.S.  dollars  and  those  of its  Orion  Europe  subsidiary  are  generally
denominated  in Deutsche  Marks.  It is possible  that the portion of  contracts
denominated in non-U.S. currencies will increase over time. The vast majority of
the  Company's  costs  (including  interest and  principal  of the Notes,  other
indebtedness  and the costs for VSATs,  Orion 2 and Orion 3) are  denominated in
U.S. dollars.  Accordingly, an increase in the value of the U.S. dollar relative
to other currencies could have an adverse effect on the Company and the value of
the Common Stock.  International  operations  are also subject to certain risks,
such  as  changes  in  domestic   and   foreign   government   regulations   and
telecommunication standards, licensing requirements,  tariffs or taxes and other
trade barriers and political and economic instability.


                                       15

<PAGE>

DEPENDENCE OF ORION ON KEY PERSONNEL

       Orion's  business is dependent on its  executive  and other  officers and
other key personnel. Orion presently does not have employment contracts with, or
key man life insurance covering, such key officers or other personnel.  The loss
of key officers or personnel could have an adverse effect on Orion.

CONTROL OF ORION BY PRINCIPAL STOCKHOLDERS

       Executive  officers,  directors  and their  affiliates  own  beneficially
approximately  8.0 million shares or  approximately  43% of Orion's  outstanding
voting  stock  (12  million  shares or  approximately  46% of the  voting  stock
outstanding on a fully diluted basis). As a result of their stock ownership and,
in the case of stockholders with  representation on the Board of Directors,  the
incumbency of directors  affiliated  with them, such  stockholders  are and will
continue to be in a position to elect the Board of Directors and thereby control
the affairs and management of Orion.

RISKS RELATING TO SENIOR PREFERRED STOCK

       At September 30, 1997, the Company has  outstanding  approximately  $16.9
million  (including  accrued  dividends)  of Orion Series A Preferred  Stock and
approximately  $5.1  million  (including  accrued  dividends)  of Orion Series B
Preferred Stock.  Although the holders of the Senior Preferred Stock have agreed
not to exercise any such  mandatory  redemption or  repurchase  rights while the
Notes or the Debentures are outstanding,  such holders have the right to require
Orion to  repurchase  the  shares  of  Common  Stock  received  as a  result  of
conversion  of the Senior  Preferred  Stock upon,  among other  things,  certain
mergers, changes of control or sales of substantially all the assets of Orion at
the pro rata interest of the holders of such stock in the consideration received
or,  in the  case of  certain  fundamental  changes,  fair  market  value;  and,
beginning  in June  1999  such  holders  have  the  right  to  require  Orion to
repurchase  Senior  Preferred  Stock (and any  Common  Stock  received  upon the
conversion  thereof) at the fair market  value (in the case of Common  Stock) or
liquidation value, including accrued and unpaid dividends (in the case of Senior
Preferred  Stock). In addition,  the documents  relating to the Senior Preferred
Stock  impose  certain  covenants  on Orion,  and  failure to comply  with those
covenants could have an adverse effect on Orion.

LIMITATIONS ON PAYING DIVIDENDS ON COMMON STOCK

       Orion has never paid any cash  dividends on its Common Stock and does not
anticipate  paying  cash  dividends  in the  foreseeable  future.  Orion  is not
permitted  to pay  dividends  on the  Common  Stock  as  long  as the  Company's
preferred  stock is  outstanding,  subject to  certain  limited  exceptions.  In
addition,  the  Notes  indentures  effectively  prohibit  the  payment  of  cash
dividends on the Common Stock for the foreseeable future.

POTENTIAL ADVERSE EFFECT OF SHARES ELIGIBLE FOR FUTURE SALE

       There are  approximately  28.4 million shares of Common Stock outstanding
on  a  fully  diluted  basis.  Orion's  current  stockholders  (other  than  the
Exchanging   Partners,   British   Aerospace  and  Matra  Marconi   Space)  hold
approximately 15.7 million of these shares, all of which are freely transferable
without restriction or further registration under the Securities Act, other than
the 5.5 million  shares held by  "affiliates"  of the  Company,  as that term is
defined under the Securities Act (approximately 35% of which also are subject to
restrictions on transfer under the Principal  Stockholder Agreement with Loral).
The shares held by  affiliates  are expected to be eligible for sale pursuant to
Rule 144 under the  Securities  Act. The Exchanging  Partners,  as owners of the
Series C Preferred  Stock  received in January 1997,  and British  Aerospace and
Matra Marconi Space, as owners of the Debentures, beneficially own the remaining
11.4  million  of such  shares of  Common


                                       16
<PAGE>

Stock which will be issuable upon conversion of such securities.  Apart from the
5,052,202  Offered  Shares which will be freely  tradeable once sold pursuant to
the  Registration  Statement of which this  Prospectus is a part,  the remaining
6,579,199  shares of Common  Stock  issuable  upon  conversion  of the  Series C
Preferred  Stock or the Debentures  are deemed to be "restricted  securities" as
that term is defined in Rule 144.  Although  the  Company  is  required  to file
certain  additional  shelf  registration  statements for the remaining shares of
Common Stock  issuable upon  conversion of the Series C Preferred  Stock and the
Debentures,  the Principal  Stockholder Agreement with Loral presently restricts
their transfer.  No predictions can be made as to the effect, if any, that sales
of Common Stock or the  availability  of  additional  shares of Common Stock for
sale  would  have on the  market  price of such  securities.  Nevertheless,  the
foregoing could  adversely  affect the market prices of the Common Stock and the
ability of the Company to raise equity financing.

ANTI-TAKEOVER AND OTHER PROVISIONS OF THE CERTIFICATE OF INCORPORATION

       Orion's  Certificate  of  Incorporation   includes  provisions  that  may
discourage  or prevent  certain  types of  transactions  involving  an actual or
potential  change in  control  of  Orion,  including  transactions  in which the
stockholders  might  otherwise  receive a premium  for  their  shares  over then
current market prices. In addition,  the Board of Directors has the authority to
fix the rights and preferences of and issue shares of preferred stock, which may
have the effect of delaying or  preventing a change in control of Orion  without
action  by the  stockholders.  The  staggered  terms of the  Company's  Board of
Directors could also discourage any potential  acquirer.  Orion's Certificate of
Incorporation  also permits the  redemption  of Common  Stock from  stockholders
where necessary to protect Orion's regulatory licenses. In addition,  any change
of control of Orion is subject to the prior approval of the FCC.


                                  USE OF PROCEEDS

             All  of  the   Offered   Shares  are  being  sold  by  the  Selling
Stockholders.  All proceeds from the sale of the Offered  Shares will be for the
account of the Selling  Stockholders.  See "Selling  Stockholders"  and "Plan of
Distribution."  The Company will not receive any of the  proceeds  from sales of
the Offered Shares.  The Company will incur certain  expenses in connection with
the offering.  Such expenses are estimated to be approximately  $55,740.  If the
Company is required to update this Prospectus,  it may incur additional expenses
in excess of the amount estimated above.



                               SELLING STOCKHOLDERS

       Certain of the Offered Shares (4,030,627  shares) are issuable to certain
of the Selling  Stockholders upon conversion of shares of the Company's Series C
Preferred  Stock  received by such  Selling  Stockholders  in exchange for their
limited partnership interests in the Company's subsidiary, Orion Atlantic, or as
dividends on the Series C Preferred  Stock  (241,835  shares).  Of the remaining
779,740  Offered  Shares,  (i) 65,455 shares were acquired by or are issuable to
one of the Selling  Stockholders  in connection with the issuance by the Company
of Common Stock on August 1, 1997 and proposed  issuance on February 1, 1998, as
interest  payments on $10 million of the Company's  Debentures  and (ii) 714,285
shares are issuable to the same Selling Stockholder upon conversion of shares of
the Debentures held by such Selling Stockholder. This Prospectus also relates to
such  indeterminate  number of  shares  of the  Common  Stock  which may  become
issuable to the Selling Stockholders pursuant to the antidilution  provisions of
the Series C  Preferred  Stock and  Debentures.  The  Offered  Shares  represent
approximately  17.8% of the  total  shares  of Common  Stock  outstanding  as of
September 30, 1997  (assuming (i) the conversion as of such date of all Series C
Preferred Stock or Debentures held by each such Selling Stockholder and (ii) the
receipt of shares of Common Stock as  dividends on the Series C Preferred  Stock
or as interest on the Debentures to which such Selling


                                       17
<PAGE>

Stockholders  are entitled to through February 1, 1998). The registration of the
Offered  Shares does not  necessarily  mean that the Selling  Stockholders  will
convert any of the Series C Preferred  Stock or  Debentures or offer or sell any
of the Offered Shares.  The Company may amend or supplement this Prospectus from
time to time to disclose the names, relationships to the Company and holdings of
Common  Stock of  additional  Selling  Stockholders  (each  of  which  will be a
"Holder" under the Registration Rights Agreements  described below) or to update
the disclosure set forth herein.

       The following  table sets forth,  as of September  30, 1997,  the name of
each  Selling  Stockholder  and the number of shares of Common  Stock which each
such Selling  Stockholder  owned as of such date (assuming (i) the conversion as
of such date of all Series C  Preferred  Stock or  Debentures  held by each such
Selling  Stockholder and (ii) the receipt of shares of Common Stock as dividends
on the Series C Preferred  Stock or as interest on the  Debentures to which such
Selling  Stockholders  are entitled to through February 1, 1998). The table also
sets  forth  the  number  of  shares  of  Common  Stock  owned  by each  Selling
Stockholder  that may be offered  for sale from time to time by this  Prospectus
and the  number  of  shares  of  Common  Stock to be held by each  such  Selling
Stockholder, assuming the sale of all of the Offered Shares.

<TABLE>
<CAPTION>

                           TOTAL NUMBERS    PERCENTAGE                   TOTAL NUMBER       PERCENTAGE OF  
                             OF SHARES      OF SHARES                     OF SHARES             SHARES     
                           BENEFICIALLY    BENEFICIALLY                  BENEFICIALLY        BENEFICIALLY  
                            OWED AS OF     OWNED AS OF     NUMBER OF        OWNED               OWNED      
                             THE DATE        THE DATE       SHARES       ASSUMING THE        ASSUMING THE  
NAME OF SELLING               OF THIS        OF THIS        OFFERED     SALE OF ALL THE     SALE OF ALL THE
  STOCKHOLDER             PROSPECTUS (1)   PROSPECTUS (1)  HEREBY (1)    OFFERED SHARES      OFFERED SHARES
  -----------            ---------------   -------------- ------------  ---------------     ---------------

<S>                       <C>              <C>          <C>              <C>                   <C>
COM DEV Satellite           597,807           2.1%         579,425          18,282                 * 
Communications Limited                                                                               
Kingston                    679,308           2.4%         679,308              --                 * 
Communications                                                                                       
International Limited                                                                                
Lockheed Martin           1,436,054           5.0%       1,196,285         239,769                 * 
Commercial Launch                                                                                    
Services, Inc.                                                                                       
MCN Sat US, Inc.            966,780           3.4%         966,780              --                 * 
Matra Marconi Space UK      779,740           2.7%         779,740              --                 * 
Limited                                                                                              
Trans-Atlantic Satellite,   850,664           3.0%         850,664              --                 * 
Inc.                                                                                                 
                                                                                                     
TOTAL                     5,310,353          18.7%       5,052,202         258,051                 * 
                          ---------                     ----------         -------                   
*  Less than 1%
</TABLE>

(1) Amount shown assumes (i) conversion of 100% of the Series C Preferred  Stock
held by each Selling Stockholder at a price of $17.50 per share of Common Stock,
(ii) receipt of approximately  3.4285 shares of Common Stock per share of Series
C Preferred Stock as dividends on the Series C Preferred Stock, (iii) conversion
of 100% of the Debentures held by a certain Selling  Stockholder at a conversion
rate of  71.42857  shares of Common  Stock for each $1,000  principal  amount of
Debentures, and (iv) receipt of 65,455 shares of Common Stock as interest on the
Debentures. The number of shares of Common Stock issuable upon conversion of the
Series C  Preferred  Stock is equal to the sum of (a) the  number  of  shares of
Common Stock computed by multiplying  the number of shares of Series C Preferred
Stock to be  converted  by $1,000,  and  dividing  the result by the  applicable
Conversion  Price  (as  such  term is used in the  certificate  of  designations
relating  to the  Series  C  Preferred  Stock),  initially  $17.50,  subject  to
adjustment,  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 shares of the
Series C Preferred  Stock to be converted.  The number of shares of Common Stock
issuable upon conversion of the Debentures is equal to the sum of (a) the number
of shares of Common  Stock  computed by  dividing  the  principal  amount of the
Debentures to be converted by $1,000,  and dividing the result by the applicable
Conversion  Rate  (as  such  term is used in the  debenture  purchase  agreement
relating to the Debentures), initially 71.42857, subject to adjustment, plus (b)
the number of shares of Common  Stock that would be payable if all  accrued  but
unpaid interest was paid on the shares of the Debentures to be converted.

       Certain of the Selling  Stockholders  are former limited  partners of the
Company's    subsidiary    Orion    Atlantic.     See    "The    Company--Recent
Developments--January 1997 Transactions--The

                                       18
<PAGE>

Exchange." The Company is or was a party to numerous agreements with one or more
of the Selling Stockholders who are former limited partners,  most of which were
entered into in December 1991, and many of which  terminated in connection  with
the Exchange.  Another Selling Stockholder,  Matra Marconi Space, is the present
parent  company  of the prime  contractor  for Orion 1, and is the  manufacturer
under the Orion 2 satellite  contract for the  construction  of Orion 2. Another
Selling  Stockholder,  MCN Sat US,  Inc.  ("Matra"),  is a  subsidiary  of Matra
Hachette that is one of the parent  companies of Matra Marconi Space. One of the
Selling Stockholders, Kingston Communications International Limited, serves as a
ground operations  representative  in the United Kingdom;  an affiliate of Matra
serves as a ground operations representative in France. The Selling Stockholders
and the Company are also party to the registration  rights agreements  described
below under "Plan of Distribution."



                               PLAN OF DISTRIBUTION

       Any of the Selling  Stockholders  named herein may from time to time,  in
one or more  transactions,  sell all or a portion of the  Offered  Shares on the
Nasdaq National Market,  in the  over-the-counter  market, on any other national
securities exchange on which the Common Stock is listed or traded, in negotiated
transactions,   in  underwritten  transactions  or  otherwise,  at  prices  then
prevailing or related to the then current market price or at negotiated  prices.
The decision to convert the Series C Preferred  Stock or Debentures  into shares
of Common Stock or to sell any Offered  Shares is within the sole  discretion of
the  holders  thereof.  There  can be no  assurance  that  any of the  Series  C
Preferred  Stock or  Debentures  will be converted or any of the Offered  Shares
will be sold by the  Selling  Stockholders.  The  offering  price of the Offered
Shares from time to time will be determined by the Selling  Stockholders and, at
the time of such determination,  may be higher or lower than the market price of
the Common Stock on the Nasdaq National Market.

       The Offered Shares may be sold directly or through  broker-dealers acting
as principal or agent, or pursuant to a distribution by one or more underwriters
on a firm  commitment or  best-efforts  basis.  The methods by which the Offered
Shares may be sold include,  but are not limited to, the following:  (i) a block
trade in which the  broker-dealer  so engaged  will  attempt to sell the Offered
Shares as agent but may  position and resell a portion of the block as principal
to facilitate the  transaction;  (ii) purchases by a broker-dealer  as principal
and resale by such  broker-dealer  for its account  pursuant to this Prospectus;
(iii)  ordinary  brokerage  transactions  and  transactions  in which the broker
solicits purchasers;  (iv) an exchange distribution in accordance with the rules
of the Nasdaq Stock Market;  (v)  privately  negotiated  transactions;  and (vi)
underwritten   transactions.   In  connection  with  an  underwritten  offering,
underwriters  or  agents  may  receive  compensation  in the form of  discounts,
concessions or  commissions  from a Selling  Stockholder  or from  purchasers of
Offered  Shares  for whom  they may act as  agents,  and  underwriters  may sell
Offered Shares to or through dealers,  and such dealers may receive compensation
in the form of  discounts,  concessions  or  commissions  from the  underwriters
and/or  commissions  from the  purchasers  for whom they may act as agents.  The
Selling  Stockholders  may also sell the Offered Shares in accordance  with Rule
144 under the Securities  Act. This  Prospectus may be amended and  supplemented
from time to time to describe a specific plan of distribution.

       From time to time,  the Selling  Stockholders  may engage in short sales,
short sales against the box, puts and calls and other transactions in securities
of the Company or  derivatives  thereof,  and may sell and deliver the shares in
connection  therewith.  From time to time, the Selling  Stockholders  may pledge
their  Offered  Shares  pursuant to the margin  provisions  of their  respective
customer  agreements with their respective brokers or otherwise.  Upon a default
by a Selling Stockholder, the brokers or pledgees may offer and sell the pledged
shares of Common Stock from time to time.


                                       19
<PAGE>

       Under  agreements that may be entered into by the Company,  underwriters,
dealers and agents who participate in the  distribution of Offered Shares may be
entitled  to  indemnification  by  the  Company  against  certain   liabilities,
including  liabilities under the Securities Act, or to contribution with respect
to payments which such  underwriters,  dealers or agents may be required to make
in respect thereof.  The Selling  Stockholders and any underwriters,  dealers or
agents  participating in the distribution of the Offered Shares may be deemed to
be  "underwriters"  within the meaning of the Securities  Act, and any profit on
the sale of the Offered Shares by the Selling  Stockholders  and any commissions
received by an such broker-dealers may be deemed to be underwriting  commissions
under the Securities Act.

       When a Selling  Stockholder  elects to make a particular offer of Offered
Shares, a Prospectus  Supplement,  if required,  will be distributed  which will
identify any underwriters,  dealers or agents and any discounts, commissions and
other terms  constituting  compensation  from such Selling  Stockholder  and any
other required information.

       Under the registration  rights agreements  relating to the Offered Shares
issuable in connection with the Series C Preferred Stock and the Debentures (the
"Registration  Rights  Agreements"),  the Company is  required  to maintain  the
effectiveness  of the  registration  statement to which this Prospectus  relates
until January 31, 2002 (or such shorter  period which will terminate when all of
the Offered Shares have been sold).  Under the terms of the Registration  Rights
Agreements  and subject to the  occurrence  of certain  events set forth therein
(each a "Suspension Event"), the Company may determine that this Prospectus will
not be usable by the Selling  Stockholders  for so long as a Suspension Event or
its effect is continuing  (but in no event to exceed 90 consecutive  days).  The
Registration  Rights Agreements also provide that, subject to certain conditions
and  limitations  set  forth  therein,  the  Company  may  require  the  Selling
Stockholders  to refrain  from any public  sale or  distribution  of the Offered
Shares issued in connection  with the Series C Preferred  Stock or Debentures or
any securities convertible into the Company's Common Stock as may be required by
the underwriters of Common Stock of the Company.

       In order to  comply  with  the  securities  laws of  certain  states,  if
applicable,  the Offered Shares may be sold only through  registered or licensed
brokers or dealers.  In addition,  in certain states, the Offered Shares may not
be sold unless they have been  registered or qualified for sale in such state or
an exemption from such  registration or  qualification  requirement is available
and is complied with.

       Pursuant to the Registration Rights Agreements, the Company has agreed to
pay all costs and expenses  incurred in connection with the  registration  under
the Securities Act of the Offered Shares,  including,  without  limitation,  all
registration  and filing fees,  printing  expenses,  fees and  disbursements  of
counsel and accountants for the Company, the fees and disbursements of one legal
counsel to the Selling  Stockholders and  underwriter's  fees and expenses,  but
excluding  underwriting  discounts and  commissions  and transfer taxes, if any,
attributable to the sale of the Offered  Shares.  Such expenses are estimated to
be approximately  $55,740. If the Company is required to update this Prospectus,
it may incur additional expenses in excess of the amount estimated above.

       Pursuant to the Registration Rights Agreements, the Company has agreed to
indemnify  each of the  Selling  Stockholders  and  their  respective  officers,
directors  and trustees and each person who controls  (within the meaning of the
Securities  Act)  such  Selling  Stockholder  against  certain  losses,  claims,
damages,  liabilities,  costs and expenses  arising under the securities laws in
connection with this offering.  Each of the Selling  Stockholders  has agreed to
indemnify  the Company,  its officers and directors and each person who controls
(within  the  meaning of the  Securities  Act) the  Company  against any losses,
claims,  damages,  liabilities,  costs and expenses arising under the securities
laws in  connection  with this  offering  with  respect to  written  information
furnished to the Company by such Selling Stockholder.


                                       20
<PAGE>

                                      EXPERTS

       The consolidated  financial statements of Orion Network Systems,  Inc. at
December 31, 1996 and 1995,  and for each of the three years in the period ended
December 31, 1996,  appearing in the Orion Network  Systems,  Inc. Annual Report
(Form 10-K and amendment thereto on Form 10-K/A) for the year ended December 31,
1996 have been audited by Ernst & Young LLP, independent  auditors, as set forth
in their report thereon included  therein and incorporated  herein by reference.
Such consolidated  financial  statements are incorporated herein by reference in
reliance  upon such report  given upon the  authority of such firm as experts in
accounting and auditing.


                                   LEGAL MATTERS

       Certain legal matters in connection  with the Common Stock offered hereby
are being  passed  upon for the Company by Hogan & Hartson  L.L.P.,  Washington,
D.C., counsel for the Company.


                               AVAILABLE INFORMATION

       The Company is subject to the informational  requirements of the Exchange
Act, and, in accordance therewith,  files reports and other information with the
Securities  and Exchange  Commission  (the  "Commission").  Such reports,  proxy
statements  and other  information  can be  inspected  at the  Public  Reference
Section  maintained  by the  Commission at Room 1024,  450 Fifth  Street,  N.W.,
Washington, D.C. 20549 and the following regional offices of the Commission: 500
West Madison Street,  Suite 1400,  Chicago,  Illinois 60661-2511 and Seven World
Trade Center,  13th Floor, New York, New York 10048. Copies of such material can
be  obtained  from the Public  Reference  Section of the  Commission,  450 Fifth
Street,  N.W.,  Washington,  D.C. 20549,  upon payment of prescribed rates or in
certain   cases  by  accessing   the   Commission's   World  Wide  Web  site  at
http://www.sec.gov.  In addition,  the  Company's  Common Stock is listed on the
Nasdaq National Market (Symbol:  ONSI),  and such reports,  proxy statements and
other information concerning the Company also can be inspected at the offices of
Nasdaq Operations, 1735 K Street, N.W., Washington, D.C. 20006.

       The Company has filed with the  Commission  a  registration  statement on
Form S-3 (the  "Registration  Statement"),  of which this  Prospectus is a part,
under the Securities Act, with respect to the Common Stock offered hereby.  This
Prospectus does not contain all of the information set forth in the Registration
Statement, certain portions of which have been omitted as permitted by the rules
and regulations of the Commission. Statements contained in this Prospectus as to
the contents of any contract or other  documents are not  necessarily  complete,
and in  each  instance,  reference  is made to the  copy  of  such  contract  or
documents filed as an exhibit to the Registration Statement, each such statement
being qualified in all respects by such reference and the exhibits and schedules
thereto.  For further  information  regarding  the Company and the Common Stock,
reference is hereby made to the  Registration  Statement  and such  exhibits and
schedules  which may be obtained from the Commission at its principal  office in
Washington, D.C. upon payment of the fees prescribed by the Commission.

       No  person  has been  authorized  to given  any  information  or make any
representations  not contained in this  Prospectus in connection  with the offer
made  by  this  Prospectus   and,  if  given  or  made,   such   information  or
representations must not be relied upon as having been authorized by the Company
or by any underwriter,  dealer or agent.  This Prospectus does not constitute an
offer  to sell or a  solicitation  of an offer  to buy any of the  Common  Stock
offered hereby in any  jurisdiction to any person to whom it is unlawful to make
such  offer or  solicitation  in such  jurisdiction.  This  Prospectus  does not
constitute an offer to sell or a solicitation  to buy any securities  other than
those to which it relates.  Neither the delivery of this Prospectus nor any sale
of  or  offer  to  sell  the  Common  Stock  offered


                                       21

<PAGE>

hereby shall, under any circumstances, create an implication that there has been
no change  in the  affairs  of the  Company  since  the date  hereof or that the
information herein is correct as of any time subsequent to its date.


                  INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

       The  documents  listed  below  have been filed by the  Company  (File No.
000-22085)  under the  Exchange  Act with the  Commission  and are  incorporated
herein by reference:

    1.  The  Company's  Current  Report  on Form  8-K  dated  October  9,  1997,
        reporting the execution of the Merger Agreement.

    2.  The Company's Annual Report on Form 10-K for the year ended December 31,
        1996 and amendment thereto on Form 10-K/A dated June 25, 1997.

    3.  The  Company's  Quarterly  Reports on Form 10-Q for the  quarters  ended
        March 31, 1997 and June 30, 1997.

    4.  The Company's  definitive proxy statement on Schedule 14A filed with the
        Commission  on April 22,  1997,  with  respect to the  Company's  annual
        meeting of stockholders held on May 22, 1997.

    5.  The  Company's  Current  Report on Form 8-K  dated  February  14,  1997,
        reporting  consummation of the Exchange,  and Current Report on Form 8-K
        dated March 26, 1997, reporting consummation of the acquisition of Orion
        Europe.

    6.  The description of the Company's Common Stock contained in the Company's
        Registration  Statement on Form 8-B filed with the Commission on January
        31, 1997,  pursuant to Section 12(g) of the Exchange Act,  including any
        amendments   or  reports   filed  for  the  purpose  of  updating   such
        description.

       All documents filed subsequent to the date of this Prospectus pursuant to
Section 13(a),  13(c),  14 or 15(d) of the Exchange Act and prior to termination
of the offering of the Common Stock to which this  Prospectus  relates  shall be
deemed to be  incorporated  by  reference in this  Prospectus  and shall be part
hereof from the date of filing of such document.

       Any statement contained herein or in a document incorporated or deemed to
be incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this  Prospectus to the extent that it is modified or superseded
by a statement  contained (i) in this Prospectus  (i.e. where a statement herein
modifies or supersedes a statement in a previously  filed document  incorporated
or deemed to be  incorporated  by reference  herein),  (ii) in any  accompanying
Prospectus  Supplement  relating to a specific offering of Common Stock or (iii)
in any other  subsequently filed document that is also incorporated or deemed to
be  incorporated  by  reference  herein.  Any  such  statement  so  modified  or
superseded  shall  not be  deemed,  except  as so  modified  or  superseded,  to
constitute a part of this Prospectus or any accompanying  Prospectus Supplement.
Subject to the foregoing,  all information appearing in this Prospectus and each
accompanying   Prospectus  Supplement  is  qualified  in  its  entirety  by  the
information appearing in the documents incorporated by reference.

       The Company will provide upon written or oral request  without  charge to
each person to whom a copy of this Prospectus is delivered, including beneficial
owners, a copy of any or all of the documents  incorporated  herein by reference
(other than exhibits to such  documents,  unless such exhibits are  specifically
incorporated by reference in such  documents).  Written requests for such


                                       22
<PAGE>

copies  should be  addressed to Richard H. Shay,  Esq.,  the  Company's  General
Counsel, at 2440 Research Boulevard, Rockville, Maryland 20850, telephone number
(301) 258-8101.


                            FORWARD-LOOKING STATEMENTS

             Information  set  forth in this  Prospectus,  including  under  the
caption "Risk Factors," and  incorporated by reference  herein contains  various
"forward-looking statements" within the meaning of Section 27A of the Securities
Act, and Section 21E of the Exchange Act,  which  statements  represent  Orion's
reasonable  judgment  concerning  the  future  and  are  subject  to  risks  and
uncertainties  that could cause Orion's actual  operating  results and financial
position  to differ  materially.  Such  forward-looking  statements  include the
following:  Orion's  projections  regarding the continuation of operating losses
and net cash flow deficits;  Orion's belief and the judgments of its independent
engineering  consultant,  Telesat Canada,  regarding the expected performance of
the Orion 1 satellite over its useful life,  and the effect of such  performance
on Orion's business;  Orion's expectations regarding the period for construction
and  launch  of  Orion 2 and  Orion  3;  Orion's  belief  that  it can  overcome
uncertainties  relating to Orion 2 and Orion 3; Orion's  expectations  regarding
receipt of regulatory approvals,  coordination of orbital slots and avoidance of
possible interference;  Orion's beliefs regarding existing and future regulatory
requirements,  its  ability to comply with such  requirements  and the effect of
such  requirements  on  its  business;  Orion's  belief  that  it  can  overcome
uncertainties  relating to Orion 2 and Orion 3; Orion's  expectations  regarding
receipt of regulatory approvals,  coordination of orbital slots and avoidance of
possible interference;  Orion's beliefs regarding existing and future regulatory
requirements,  its  ability to comply with such  requirements  and the effect of
such  requirements on its business;  Orion's  beliefs  regarding the competitive
advantages of satellites and of Orion's  satellites,  strategies and services in
particular,  both in general and as compared to other  providers  of services or
transmission  capacity  and other  services  presently  offered  or which may be
offered  in  the  future;   Orion's   expectations   regarding   the  growth  in
telecommunications  and the  demand  for  telecommunications  services;  Orion's
beliefs regarding the demand for or attractiveness of Orion's services;  Orion's
beliefs regarding  technological advances and their effect on telecommunications
services or demand  therefor;  Orion's  beliefs  regarding  availability  of net
operating loss carryforwards;  Orion's beliefs regarding its representatives and
distributors;  Orion's  intention not to pay any dividend on the Common Stock in
the foreseeable future; Orion's belief that any liability that might be incurred
by Orion upon the resolution of certain existing or future legal proceedings not
having a material  adverse  effect on the  consolidated  financial  condition or
results of operations of Orion; and the adoption of new accounting  releases not
being material to its financial condition or results of operations.

       Orion  cautions  that the  above  statements  are  further  qualified  by
important  factors that could cause Orion's actual results to differ  materially
from those in the  forward-looking  statements.  Such factors  include,  without
limitation,  those set forth in this  Prospectus  under "Risk  Factors"  and the
following:  no assurances regarding the business plan; Orion's history of losses
and expectation of future losses; the substantial  financial risks and financing
requirements;  substantial  leverage  and  limits on  Orion's  ability  to raise
additional  funds;  risks of satellite  loss or reduced  performance;  launch of
Orion 2 and  Orion 3  being  subject  to  significant  uncertainties;  potential
adverse  effects of  competition;  no  assurances  regarding  approvals  needed,
current or future regulation of the  telecommunications  industry; no assurances
regarding  technological  changes; risks of conducting  international  business;
dependence   of  Orion  on  key   personnel;   control  of  Orion  by  principal
stockholders;  risks  relating  to  senior  preferred  stock;  limits  on paying
dividends on Orion common stock; and  anti-takeover  and other provisions of the
Certificate of Incorporation. See "Risk Factors."


                                       23

<PAGE>


                                      PART II

                      INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM  14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

       The following  table sets forth the various  expenses in connection  with
the issuance and distribution of the securities being registered  hereby,  other
than  underwriting  discounts  and  commissions.  All  amounts  except  the  SEC
Registration Fee are estimated.

SEC Registration Fee                    $  25,740
Blue Sky Fees and Expenses                  3,000
Accounting Fees and Expenses               15,000
Legal Fees and Expenses                    10,000
Printing and Engraving Expenses             2,000
                                        ---------
        Total                           $  55,740
                                        =========


ITEM  15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

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

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

       The Company has agreed to indemnify each of the Selling  Stockholders and
their respective  officers,  directors and trustees and each person who controls
(within the meaning of the  Securities  Act) such  Selling  Stockholder  against
certain losses, claims, damages,  liabilities,  costs and expenses arising under
the  securities  laws in  connection  with this  offering.  Each of the  Selling
Stockholders has agreed to indemnify the Company, its officers and directors and
each person who controls  (within the meaning of the Securities Act) the Company
against any losses,  claims,  damages,  liabilities,  costs


                                      II-1
<PAGE>

and expenses  arising under the securities laws in connection with this offering
with  respect to written  information  furnished  to the Company by such Selling
Stockholder.

ITEM  16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

       (A)  EXHIBITS.

<TABLE>
<CAPTION>
EXHIBIT
NUMBER       EXHIBIT DESCRIPTION
- -------      -------------------
<S>         <C>

3.1          Restated  Certificate of Incorporation of Orion Network Systems,  Inc.
             (Incorporated  by  reference  to exhibit  number  3.1 in  Registration
             Statement on Form 8-B filed with the Commission on January 31, 1997).

3.2          Amended  and  Restated   Bylaws  of  Orion   Network   Systems,   Inc.
             (Incorporated  by  reference  to exhibit  number  3.2 in  Registration
             Statement on Form 8-B filed with the Commission on January 31, 1997).

3.3          Certificate  of Amendment of  Certificate  of  Incorporation  of Orion
             Network  Systems,  Inc.  (Incorporated  by reference to exhibit number
             3.1 in Registration Statement No. 333-32457 on Form S-8).

4.1          Form  of  Common  Stock  Certificate  of  Orion.  (Incorporated  by
             reference to exhibit number 4.5 in Registration Statement No.
             333-19795 on Form S-4).

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

21.1         List of subsidiaries of Orion Network Systems,  Inc.  (Incorporated
             by reference to exhibit number 21.1 in Registration Statement No.
             333-32457 on Form S-8).

23.1         Consent of Ernst & Young LLP.

23.2         Consent  of Hogan & Hartson  L.L.P.  (included  in the  legal  opinion
             filed as Exhibit 5.1 hereto).

24.1         Power of Attorney (included on signature page).
</TABLE>

       (B)  FINANCIAL STATEMENT SCHEDULES.

       Schedules have been omitted  because the  information  required to be set
forth therein is not applicable or is shown in the items incorporated  herein by
reference.

ITEM  17.  UNDERTAKINGS

       The undersigned registrant hereby undertakes:

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

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

                                      II-2

<PAGE>

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

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

provided,  however,  that  subparagraphs  (i) and (ii) above do not apply if the
registration statement is on Form S-3, Form S-8 or Form F-3, and the information
required to be included in a  post-effective  amendment by those  paragraphs  is
contained in periodic  reports filed with or furnished to the  Commission by the
registrant  pursuant to Section 13 or Section 15(d) of the  Securities  Exchange
Act of 1934 that are incorporated by reference in this registration statement.

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

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

       The undersigned registrant further undertakes that:

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

       For the purposes of determining any liability under the Securities Act of
1933, each filing of the registrant's annual report pursuant to Section 13(a) or
Section 15(d) of the  Securities  Exchange Act of 1934 that is  incorporated  by
reference  in  this  registration   statement  shall  be  deemed  to  be  a  new
registration  statement  relating to the Common Stock offered  therein,  and the
offering  of such  Common  Stock at that time shall be deemed to be the  initial
bona fide offering thereof.

       Insofar as indemnification  for liabilities  arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
registrant pursuant to the foregoing  provisions,  or otherwise,  the registrant
has been advised that in the opinion of the Securities  and Exchange  Commission
such indemnification is against public policy as expressed in the Securities Act
and is, therefore,  unenforceable. In the event that a claim for indemnification
against such  liabilities  (other than the payment by the registrant of expenses
incurred or paid by a director,  officer or controlling person of the registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director,  officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to


                                      II-3
<PAGE>


a court of appropriate jurisdiction the question whether such indemnification by
it is against  public  policy as  expressed  in the  Securities  Act and will be
governed by the final adjudication of such issue.




                                      II-4
<PAGE>


                                   SIGNATURES

       Pursuant  to the  requirements  of the  Securities  Act,  the  Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the  City of  Rockville,  State  of  Maryland  on the 4th day of
November, 1997.

                                      ORION NETWORK SYSTEMS, INC.



                                      BY:   /s/ W. Neil
                                      Bauer___________________
                                          W. Neil Bauer
                                          President and Chief Executive Officer


                                POWER OF ATTORNEY

             Know  all  Men  by  These  Presents,  that  each  individual  whose
signature  appears below  constitutes and appoints John G. Puente, W. Neil Bauer
and David J. Frear, and each of them, his true and lawful  attorney-in-fact  and
agent, with power of substitution and  resubstitution,  for him and in his name,
place  and  stead,  in any and all  capacities,  to sign any and all  amendments
(including  post-effective  amendments) to this Registration  Statement,  and to
sign  any  and all  registration  statements  relating  to the  registration  of
additional  shares of Common Stock issuable (i) upon conversion of the Company's
Series C 6% Cumulative  Redeemable  Convertible  Preferred  Stock (the "Series C
Preferred Stock"), (ii) as dividends on the Series C Preferred Stock, (iii) upon
conversion of shares of the Company's convertible junior subordinated debentures
(the  "Debentures"),  or (iv) as  interest  payments  on the  Debentures  (which
registration   statements  may  constitute   amendments  to  this   Registration
Statement)  pursuant to the Securities Act of 1933, as amended,  and to file the
same,  with all exhibits  thereto and other  documents in connection  therewith,
with   the   Securities   and   Exchange   Commission,    granting   unto   said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite  and necessary to be done in
and about the  premises,  as fully to all  intents  and  purposes as he might or
could do in person,  hereby ratifying and confirming all that said attorneys-in-
fact and agents, or any of them, or their, his or her substitutes or substitute,
may lawfully do or cause to be done by virtue hereof.

             Pursuant to the  requirements  of the  Securities  Act of 1933,  as
amended,  this  Registration  Statement  has been signed below by the  following
persons in the capacities and on the dates indicated.


            Signature                      Title                     Date

        /s/ W. Neil Bauer               Chief Executive        November 4, 1997
- --------------------------------     Officer and Director
    W. Neil Bauer, President     (Principal Executive Officer)
                               


       /s/ David J. Frear               Chief Financial        November 4, 1997
- --------------------------------     Officer and Treasurer
 David J. Frear, Vice President  (Principal Financial Officer
                               and Principal Accounting Officer)
                               


                                      II-5
<PAGE>




      /s/ Gustave M. Hauser              Director              November  4, 1997
- --------------------------------
   Gustave M. Hauser, Chairman


       /s/ John V. Saeman                Director              November 4, 1997
- --------------------------------
         John V. Saeman


       /s/ John G. Puente                Director              November 4, 1997
- --------------------------------
         John G. Puente


      /s/ Richard J. Brekka              Director              November 4, 1997
- --------------------------------
        Richard J. Brekka


    /s/ Warren B. French, Jr.            Director              November 4, 1997
- --------------------------------
      Warren B. French, Jr.


       /s/ Sidney S. Kahn                Director              November 4, 1997
- --------------------------------
         Sidney S. Kahn


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


     /s/ Robert M. Van Degna             Director              November 4, 1997
- --------------------------------
       Robert M. Van Degna


       /s/ Barry Horowitz                Director              November 4, 1997
- --------------------------------
         Barry Horowitz


                                      II-6



                                                                     EXHIBIT 5.1





                                November 13, 1997


Board of Directors
Orion Network Systems, Inc.
2440 Research Boulevard
Suite 400
Rockville, Maryland  20850



Ladies and Gentlemen:

           We are acting as counsel to Orion Network  Systems,  Inc., a Delaware
corporation  (the "Company"),  in connection with the registration  statement on
Form S-3 (the  "Registration  Statement") filed with the Securities and Exchange
Commission  relating to the proposed public  offering of up to 5,052,202  shares
(the  "Offered  Shares")  of the  Company's  common  stock,  $.01 par value (the
"Common  Stock"),  all of  which  Offered  Shares  may be  sold  by the  Selling
Stockholders  identified in the Registration  Statement from time to time as set
forth in the prospectus  which forms a part of the  Registration  Statement (the
"Prospectus")  and  as to be  set  forth  in  one  or  more  supplements  to the
Prospectus.  The Offered Shares consist of (i) 4,030,627  shares of Common Stock
(the "Series C  Conversion  Shares")  issuable  upon  conversion  of Series C 6%
Cumulative Redeemable  Convertible Stock of the Company (the "Series C Preferred
Stock"),  (ii) 241,835  shares of Common Stock (the "Series C Dividend  Shares")
issuable in payment of  dividends  on Series C Preferred  Stock,  (iii)  779,740
shares of  Common  Stock  (the  "Debenture  Conversion  Shares")  issuable  upon
conversion of certain convertible junior subordinated  debentures of the Company
(the  "Debentures"),  and (iv)  65,455  shares of Common  Stock (the  "Debenture
Interest Shares") issuable in payment of interest on the Debentures.

           This opinion letter is furnished to you at your request to enable you
to fulfill the  requirements of Item 601(b)(5) of Regulation S-K, 17 C.F.R.  ss.
229.601(b)(5), in connection with the Registration Statement.

           For purposes of this opinion  letter,  we have examined copies of the
following documents:

<PAGE>
Board of Directors
Orion Network Systems, Inc.
November 13, 1997
Page 2

           1.   An executed copy of the Registration Statement.

           2.   An executed copy of the Debenture Purchase  Agreement,  dated as
                of January 13, 1997,  as amended as of January 31,  1997,  among
                the Company,  British Aerospace Holdings, Inc. and Matra Marconi
                Space UK Limited (the "Debenture Purchase Agreement").

           3.   The  Certificate  of  Designations  for the  Series C  Preferred
                Stock,  as certified  by the  Secretary of State of the State of
                Delaware on November 3, 1997 and by the  Assistant  Secretary of
                the Company on the date hereof as then being complete,  accurate
                and in effect (the "Certificate of Designations").

           4.   The Restated  Certificate of  Incorporation  of the Company,  as
                certified by the  Secretary of State of the State of Delaware on
                November 3, 1997 and by the  Assistant  Secretary of the Company
                on the date  hereof  as then  being  complete,  accurate  and in
                effect (the "Certificate of Incorporation").

           5.   The Amended and Restated Bylaws of the Company,  as certified by
                the  Assistant  Secretary  of the  Company on the date hereof as
                being complete, accurate and in effect (the "Bylaws").

           6.   Resolutions of the Board of Directors of the Company  adopted on
                October 31, 1997, as certified by the Assistant Secretary of the
                Company on the date hereof as then being complete,  accurate and
                in effect,  relating to the filing of the Registration Statement
                and related matters (the "Authorizing Resolutions").

           In our  examination of the aforesaid  documents,  we have assumed the
genuineness  of all  signatures,  the legal  capacity  of natural  persons,  the
authenticity,  accuracy and  completeness of all documents  submitted to us, and
the conformity with the original  documents of all documents  submitted to us as
certified, telecopied, photostatic, or reproduced copies. This opinion letter is
given, and all statements herein are made, in the context of the foregoing.

<PAGE>
Board of Directors
Orion Network Systems, Inc.
November 13, 1997
Page 3

           This  opinion  letter  is based as to  matters  of law  solely on the
General  Corporation  Law of the State of Delaware (the  "DGCL").  We express no
opinion herein as to any other laws, statutes, regulations or ordinances.

           Based upon,  subject to and limited by the  foregoing,  we are of the
opinion that:

           (i) when Series C  Conversion  Shares are issued and  delivered  upon
conversion of Series C Preferred  Stock in accordance  with the  Certificate  of
Designations and the Authorizing  Resolutions,  such Series C Conversion  Shares
will be validly issued, fully paid and non-assessable.

           (ii) when  Series C  Dividend  Shares are  issued  and  delivered  in
payment of validly declared  dividends on Series C Preferred Stock in accordance
with the Certificate of Designations,  with the Authorizing Resolutions and with
additional appropriate resolutions duly adopted by the Board of Directors of the
Company  authorizing and declaring such dividends and the payment thereof,  such
Series C Dividend Shares will be validly issued, fully paid and non-assessable.

           (iii) when the Debentures  Conversion Shares are issued and delivered
upon  conversion of  Debentures  in  accordance  with the terms of the Debenture
Purchase Agreement and the Debentures and with the Authorizing Resolutions, such
Debentures   Conversion   Shares  will  be  validly   issued,   fully  paid  and
non-assessable.

           (iv) when  Debenture  Interest  Shares are issued  and  delivered  in
payment  of  interest  on the  Debentures  in  accordance  with the terms of the
Debenture  Purchase  Agreement  and the  Debentures  and  with  the  Authorizing
Resolutions,  such Debenture Interest Shares will be validly issued,  fully paid
and non-assessable.

           We assume no obligation to advise you of any changes in the foregoing
subsequent to the delivery of this opinion letter.  This opinion letter has been
prepared solely for your use in connection  with the filing of the  Registration
Statement on the date of this  opinion  letter and should not be quoted in whole
or in part or  otherwise  be  referred  to, nor filed with or  furnished  to any
governmental agency or other person or entity, without the prior written consent
of this firm.

<PAGE>

Board of Directors
Orion Network Systems, Inc.
November 13, 1997
Page 4

           We hereby consent to the filing of this opinion letter as Exhibit 5.1
to the  Registration  Statement  and to the  reference  to this  firm  under the
caption  "Validity of the  Securities" in the prospectus  constituting a part of
the Registration Statement. In giving this consent, we do not thereby admit that
we are an "expert" within the meaning of the Securities Act of 1933, as amended.


                                     Very truly yours,



                                     HOGAN & HARTSON L.L.P.






                                                                    EXHIBIT 23.1

                         CONSENT OF INDEPENDENT AUDITORS


We  consent to the  reference  to our firm under the  caption  "Experts"  in the
Registration  Statement (Form S-3 No. 333-xxxxx) and related Prospectus of Orion
Network  Systems,  Inc. for the  registration of 5,052,202  shares of its common
stock and to the incorporation by reference therein of our report dated March 7,
1997,  with respect to the  consolidated  financial  statements of Orion Network
Systems, Inc. (a Delaware corporation that is now known as Orion Oldco Services,
Inc.)  included in its Annual  Report (Form 10-K and  amendment  thereto on Form
10-K/A) for the year ended  December 31,  1996,  filed with the  Securities  and
Exchange Commission.




                                                   ERNST & YOUNG LLP


Washington, D.C.
November 11, 1997




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