ORBITAL SCIENCES CORP /DE/
10-Q, 1995-08-14
GUIDED MISSILES & SPACE VEHICLES & PARTS
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               SECURITIES AND EXCHANGE COMMISSION
                     Washington, D.C.  20549
                                
                            FORM 10-Q
                                
       Quarterly Report Pursuant to Section 13 or 15(d) of
               the Securities Exchange Act of 1934
                                
                      For the quarter ended
                                
                          June 30, 1995
                                
                  ORBITAL SCIENCES CORPORATION
                                
                                
                 Commission file number 0-18287
                                
                                
          Delaware                           06-1209561
  (State of Incorporation)               (IRS Identification
                                               number)
                                       
  21700 Atlantic Boulevard                        
   Dulles, Virginia 20166                  (703) 406-5000
    (Address of principal                (Telephone number)
     executive offices)
                                       
                                
                                
The registrant has (1) filed all reports required to be filed by
Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months, and (2) has been subject to such filing
               requirements for the past 90 days.
                                
     As of August 10, 1995, 22,662,618 shares of the
           registrant's common stock were outstanding.
<PAGE>
<TABLE>
<CAPTION>
                                
                               PART I
                       FINANCIAL INFORMATION
ITEM 1.  FINANCIAL STATEMENTS
                    ORBITAL SCIENCES CORPORATION
               CONDENSED CONSOLIDATED BALANCE SHEETS
                           (Unaudited; in
                    thousands, except share data)
                                  
                                                                    
                 A S S E T S
                                                           June 30,            December 31,
                                                             1995                1994
<S>                                                        <C>                 <C>

CURRENT ASSETS:                                                                        
Cash and cash equivalents                                   $18,377             $21,156
Short-term investments, at market                            21,440              12,426
Receivables, net                                             83,376              94,236
Inventories                                                  28,320              26,098
Deferred income taxes and other assets                        8,145               5,914
     Total current assets                                   159,658             159,830
                                                                                       
PROPERTY, PLANT AND EQUIPMENT, at cost, less                                           
     accumulated depreciation and amortization of 
     $30,366 and $33,432, respectively                      101,882             102,061
                                                                                       
INVESTMENTS IN AFFILIATES                                    64,093              54,721
                                                                                       
EXCESS OF PURCHASE PRICE OVER NET ASSETS ACQUIRED,                                     
     less accumulated amortization of $11,426 and            67,464              68,878
$10,042, respectively
                                                                                       
DEFERRED INCOME TAXES AND OTHER ASSETS                       15,737              17,238
                                                                                       
          TOTAL ASSETS                                     $408,834            $402,728
                                                                                       
CURRENT LIABILITIES:                                                                   
     Short-term borrowings and current portion of                                      
     long-term obligations                                  $11,752             $28,160
     Accounts payable                                        13,823              14,961
     Accrued expenses                                        26,381              37,439
     Payable to subcontractors                                3,259              13,695
     Deferred revenue                                        11,557              13,272
     Total current liabilities                               66,772             107,527
                                                                                       
LONG-TERM OBLIGATIONS, net of current portion                95,203              81,163
                                                                                       
DEFERRED INCOME TAXES AND OTHER LIABILITIES                  11,245              11,992
          TOTAL LIABILITIES                                 173,220             200,682
                                                                                       
                                                                                       
COMMITMENTS AND CONTINGENCIES                                                          
                                                                                       
STOCKHOLDERS' EQUITY:                                                                  
     Preferred stock, par value $.01; 10,000,000                                       
       shares authorized, no shares issued or outstanding         -                   -
     Common stock, par value $.01; 40,000,000 shares                                   
       authorized, 22,636,351 and 20,170,196 shares                                               
       outstanding,  after deducting 15,735 shares 
       held in treasury                                         227                 202
     Additional paid-in capital                             237,549             201,328
     Unrealized gains (losses) on short-term                 
       investments                                            (221)               (462)
     Retained earnings (losses)                             (1,941)                 978
     Total stockholders' equity                             235,614             202,046
          TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY       $408,834            $402,728


See accompanying notes to condensed consolidated financial statements
</TABLE>
<PAGE>
<TABLE>
<CAPTION>

               ORBITAL SCIENCES CORPORATION
       CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
       (Unaudited; in thousands, except share data)
                                                                                               
                                                                                
                                                                          Three Months
                                                                              Ended
                                                                            June 30,
                                                                  1995                   1994
<S>                                                               <C>                    <C>
                                                                                               
REVENUES                                                         $64,589                $48,365
                                                                                               
COSTS OF GOODS SOLD                                               47,806                 37,594
                                                                                               
GROSS PROFIT                                                      16,783                 10,771
                                                                                               
RESEARCH AND DEVELOPMENT EXPENSES                                  4,932                  2,808
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES                      11,497                  7,215
AMORTIZATION OF EXCESS OF PURCHASE PRICE OVER                                                  
        NET ASSETS ACQUIRED                                          740                    385
                                                                                               
INCOME (LOSS) FROM OPERATIONS                                      (386)                    363
                                                                                               
NET INTEREST INCOME (EXPENSE)                                    (1,119)                    420
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES                           (65)                  (121)
                                                                                               
INCOME (LOSS) BEFORE PROVISION FOR INCOME TAXES                  (1,570)                    662
                                                                                               
PROVISION (BENEFIT) FOR INCOME TAXES                               (843)                    101
                                                                                               
NET INCOME (LOSS)                                                 ($727)                   $561
                                                                                               
                                                                                               
                                                                                               
NET INCOME PER COMMON AND COMMON EQUIVALENT SHARE                ($0.03)                  $0.03
                                                                                               
SHARES USED IN COMPUTING NET INCOME                                                            
         PER COMMON AND COMMON EQUIVALENT SHARE               21,220,824             17,943,673
                                                                                               
NET INCOME PER COMMON SHARE, ASSUMING FULL DILUTION              ($0.03)                  $0.03
                                                                                               
SHARES USED IN COMPUTING NET INCOME                                                            
         PER COMMON SHARE, ASSUMING FULL DILUTION             25,116,476             22,048,014



See accompanying notes to condensed consolidated financial statements
</TABLE>
<PAGE>
<TABLE>
<CAPTION>

                     ORBITAL SCIENCES CORPORATION
       CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
        (Unaudited; in thousands, except share data)
                                         
                                                              Six Months Ended
                                                                  June 30,
                                                             1995          1994
<S>                                                         <C>            <C>       
REVENUES                                                    $132,930       $98,675
                                                                                  
COSTS OF GOODS SOLD                                           97,293        73,623
                                                                                  
GROSS PROFIT                                                  35,637        25,052
                                                                                  
RESEARCH AND DEVELOPMENT EXPENSES                              8,764         6,506
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES                  22,707        14,472
AMORTIZATION OF EXCESS OF PURCHASE PRICE OVER                                     
        NET ASSETS ACQUIRED                                    1,400           808
                                                                                  
INCOME (LOSS) FROM OPERATIONS                                  2,766         3,266
                                                                                  
NET INTEREST INCOME (EXPENSE)                                (1,887)           931
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES                        362         (544)
                                                                                  
INCOME BEFORE PROVISION FOR INCOME TAXES                                          
     AND CUMULATIVE EFFECT OF ACCOUNTING CHANGE                1,241         3,653
                                                                                  
PROVISION FOR INCOME TAXES                                         -           917
                                                                                  
INCOME (LOSS) BEFORE CUMULATIVE                                                    
     EFFECT OF ACCOUNTING CHANGE                               1,241         2,736
                                                                                  
CUMULATIVE EFFECT OF ACCOUNTING CHANGE                       (4,160)             -
                                                                                  
NET INCOME (LOSS)                                           ($2,919)        $2,736
                                                                                  
NET INCOME PER COMMON AND COMMON EQUIVALENT SHARE                                 
Income Before Cumulative Effect of Accounting Change           $0.06         $0.15
Cumulative Effect of Accounting Change                       ($0.20)             -
                                                             ($0.14)         $0.15
                                                                                  
SHARES USED IN COMPUTING NET INCOME                                               
         PER COMMON AND COMMON EQUIVALENT SHARE           20,954,359    17,904,561
                                                                                  
NET INCOME PER COMMON SHARE, ASSUMING FULL DILUTION                               
Income Before Cumulative Effect of Accounting Change           $0.06         $0.12
Cumulative Effect of Accounting Change                       ($0.20)             -
                                                             ($0.14)         $0.12
SHARES USED IN COMPUTING NET INCOME                                               
         PER COMMON SHARE, ASSUMING FULL DILUTION         24,863,449    22,011,237


See accompanying notes to condensed consolidated financial statements
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
                ORBITAL SCIENCES CORPORATION
      CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                 (Unaudited; in thousands)
                                                                    
                                                                    
                                                                         Six Months Ended
                                                                             June 30,
                                                                   1995             1994
<S>                                                                <C>              <C>
CASH FLOWS FROM OPERATING ACTIVITIES:                                                       
     Net income (loss)                                               ($2,919)         $2,735
     Adjustments to reconcile net income to net cash                                        
provided by
       (used in)operating activities:
     Depreciation and amortization expense                              9,620          4,978
     Equity in (earnings) losses of affiliates                            361            543
     Cumulative effect of accounting change                             4,160              -
     Change in assets and liabilities:                                                      
     (Increase) decrease in receivables                                10,860            402
     (Increase) decrease in inventory                                 (2,222)            727
     (Increase) decrease in other current assets                      (2,467)          (629)
     (Increase) decrease in deposits and other assets                   1,236          3,043
     Increase (decrease) in payables and accrued expenses            (24,132)        (9,660)
     Increase (decrease) in deferred revenue                          (2,216)       (11,904)
     Increase (decrease) in deferred income taxes and other             (747)          (428)
     Net cash provided by (used in) operating activities              (8,466)       (10,193)
                                                                                            
CASH FLOWS FROM INVESTING ACTIVITIES:                                                       
     Capital expenditures                                             (9,854)       (10,287)
     Proceeds from sales of fixed assets                                  125              -
     Purchase of investment securities                               (13,083)        (8,916)
     Sale of investment securities                                      4,310          4,990
     Investments in affiliates                                        (9,689)        (5,125)
     Net cash used in investing activities                           (28,191)       (19,338)
                                                                                            
CASH FLOWS FROM FINANCING ACTIVITIES:                                                       
     Net short-term borrowings                                       (16,435)        (2,667)
     Principal payments on long-term obligations                      (2,933)          (751)
     Proceeds from issuance of long-term obligations                   20,000              -
     Net proceeds from issuances of common stock                       33,246          1,161
     Adjustment to recast pooled company's year end                         -        (1,138)
     Net cash provided by (used in) financing activities               33,878        (3,395)
                                                                                            
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                  (2,779)       (32,926)
                                                                                            
CASH AND CASH EQUIVALENTS, beginning of period                         21,156         49,458
CASH AND CASH EQUIVALENTS, end of period                              $18,377        $16,532
                                
                                
                                
See accompanying notes to condensed consolidated financial statements
</TABLE>
<PAGE>


                  ORBITAL SCIENCES CORPORATION
      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                     JUNE 30, 1995 AND 1994
                           (Unaudited)

BASIS OF PRESENTATION

       In  the  opinion  of  management,  the  accompanying  unaudited
interim    financial    information    reflects    all    adjustments,
consisting  of  normal  recurring  accruals,  necessary  for  a   fair
presentation    thereof.     Certain    information    and    footnote
disclosure  normally  included  in financial  statements  prepared  in
accordance   with   generally  accepted  accounting  principles   have
been  condensed  or  omitted  pursuant  to  instructions,  rules   and
regulations  prescribed  by the Securities  and  Exchange  Commission.
Although  the  Company  believes that  the  disclosures  provided  are
adequate  to  make  the  information presented not  misleading,  these
unaudited   interim   condensed  consolidated   financial   statements
should   be   read  in  conjunction  with  the  audited   consolidated
financial  statements  and  the  footnotes  thereto  included  in  the
Company's  Annual  Report  on Form 10-K for the  year  ended  December
31,  1994.   Operating  results for the three- and  six-month  periods
ended  June  30,  1995  and  1994 are not  necessarily  indicative  of
the results expected for the full year.

Orbital   Sciences   Corporation   is   hereafter   referred   to   as
"Orbital" or the "Company."

     (1)   The Financial Accounting Standards Board recently
     issued Statement of Financial Accounting Standards  No.
     121,  "Accounting  for  the  Impairment  of  Long-Lived
     Assets  and Long-Lived Assets to be Disposed Of" ("SFAS
     121"), which (i) requires that long-lived assets "to be
     held  and  used"  be  reviewed for impairment  whenever
     events  or changes in circumstances indicate  that  the
     carrying  amount  of an asset may not  be  recoverable,
     (ii)  requires that long-lived assets "to  be  disposed
     of" be reported at the lower of carrying amount or fair
     value  less cost to sell, and (iii) provides guidelines
     and  procedures for measuring an impairment  loss  that
     are  significantly  different from existing  guidelines
     and procedures.
     
     The  Company adopted the provisions of SFAS 121  during
     the  quarter ended June 30, 1995.  As a result,  as  of
     January   1,   1995  Orbital  recorded   a   cumulative
     adjustment  for  a  change in accounting  principle  of
     approximately $4.2 million related to the impairment in
     the carrying amount of certain assets to be disposed of
     that support its orbit transfer vehicle product line.
     
     (2)  Inventories
     
     Inventories  consist of components inventory,  work-in-
     process inventory and finished goods inventory and  are
     generally stated at the lower of cost or net realizable
     value    on   a   first-in,   first-out   or   specific
     identification basis.
     
     Components  inventory consists primarily of  components
     and   raw   materials  purchased  to   support   future
     production efforts.  Work-in-process inventory consists
     primarily  of (i) costs incurred under U.S.  Government
     fixed-price   contracts   accounted   for   using   the
     percentage  of completion method of accounting  applied
     on  a  units  of  delivery  basis  and  (ii)  partially
     assembled  commercial products, and generally  includes
     direct  production costs and certain allocated indirect
     costs   (including  an  allocation   of   general   and
     administrative costs).  Work-in-process  inventory  has
     been reduced by contractual progress payments received.
     Finished  goods  inventory consists of fully  assembled
     commercial products awaiting shipment.
     
     (3)  Investments in Affiliates
     
     The   Company's   majority-owned  subsidiary,   Orbital
     Communications  Corporation  ("OCC"),   and   Teleglobe
     Mobile Partners, an affiliate of Teleglobe Inc., formed
     a   partnership,  ORBCOMM  Development  Partners,  L.P.
     ("ORBCOMM  Development"), for  the  two-phased  design,
     development,   construction,  integration,   test   and
     operation    of   a   26-satellite   low-Earth    orbit
     communications system (the "ORBCOMM System").  Pursuant
     to  the  terms  of the partnership agreement,  OCC  and
     Teleglobe Mobile Partners are each 50% general partners
     in ORBCOMM Development.  Teleglobe Mobile has an option
     to  invest an additional $70,000,000 in the next  phase
     of the ORBCOMM System implementation.
     
     Orbital   and   OCC  are  the  primary   suppliers   of
     communications  satellites,  launch  vehicles,   ground
     tracking   systems,  system  software  and  integration
     services   to  ORBCOMM  Development,  and  successfully
     launched  the  first two ORBCOMM System  satellites  in
     April   1995.    In  July  1995,  Orbital  successfully
     completed   on-orbit   functional   testing   of    the
     satellites.   With  the testing complete,  ORBCOMM  can
     begin  conducting communications testing with customers
     in actual operating conditions.
     
     Based on its current assessment of the overall business
     prospects  of  ORBCOMM  Development  and   the  ORBCOMM
     System,  the Company currently believes its  investment
     in  ORBCOMM Development of approximately $64,000,000 is
     fully  recoverable.  If, in the future,  implementation
     of   the   ORBCOMM  System  is  significantly  delayed,
     significantly restricted or abandoned, the Company  may
     be required to expense part or all of its investment.
     
     (4)  Equity in Earnings (Losses) of Affiliates
     
     During  the six months ended June 30, 1995 and for  the
     years   ended  December  31,  1994  and  1993,  Orbital
     recorded   contract  revenues  on  sales   to   ORBCOMM
     Development  of approximately $12,000,000,  $30,000,000
     and $38,000,000, respectively, and eliminated as equity
     in  earnings of affiliates 50% of its profits on  those
     sales.   At  June  30, 1995, Orbital had  approximately
     $7,900,000   in  unbilled  receivables   from   ORBCOMM
     Development.

     During the construction phase of the ORBCOMM System and
     prior   to  the  commencement  of  planned  operations,
     ORBCOMM  Development is capitalizing substantially  all
     construction-related costs and is expensing as incurred
     all selling, general and administrative costs as period
     costs.
     
     (5)  Long-Term Unsecured Debt
     
     In  June  1995, the Company entered into a $20  million
     fixed-rate unsecured debt financing arrangement with  a
     private  insurance company.  The debt  has  a  six-year
     term and bears interest at 10 1/2% per annum.
     
     (6)  Common Stock and Income Per Share
     
     In June 1995, the Company completed a private placement
     of  two  million shares of its Common Stock,  receiving
     net   proceeds  of  approximately  $32  million.    The
     Company's shares were  placed  with  various   offshore
     institutional  investors and the  issuance  was  exempt
     from  public registration pursuant to Regulation  S  of
     the Securities Act of 1933, as amended.
     
     Income  per  common  and  common  equivalent  share  is
     calculated using the weighted average number of  common
     and  common equivalent shares, to the extent  dilutive,
     outstanding  during  the periods.   Income  per  common
     share  assuming full dilution is calculated  using  the
     weighted average number of common and common equivalent
     shares  outstanding during the periods plus the effects
     of  an  assumed  conversion of  the  Company's  6  3/4%
     convertible   subordinated  debentures,  after   giving
     effect  to all net income adjustments that would result
     from  the  assumed conversion.  Any reduction  of  less
     than  three  percent  in  the aggregate  has  not  been
     considered dilutive in the calculation and presentation
     of income per common share assuming full dilution.
     
     (7)  Income Taxes
     
     The   Company  has  recorded  its  interim  income  tax
     provision based on estimates of the Company's effective
     tax  rate expected to be applicable for the full fiscal
     year.    Estimated  effective  rates  recorded   during
     interim   periods  may  be  periodically  revised,   if
     necessary, to reflect current estimates.
     
     
     (8)  Hercules Incorporated
     
     In  November  1988,  Orbital and Hercules  Incorporated
     ("Hercules")  entered into an joint  venture  agreement
     relating  to  the  development and  production  of  the
     Pegasus   space  launch  vehicle  (the  "Joint  Venture
     Agreement").    In  1994,  Alliant  Techsystems,   Inc.
     ("Alliant")  acquired the assets of Hercules  Aerospace
     Company (a wholly owned subsidiary of Hercules) and, in
     connection   therewith,   assumed   the   rights    and
     responsibilities of Hercules with respect to the  Joint
     Venture Agreement.  During the second quarter of  1995,
     Orbital   and   Alliant  replaced  the  Joint   Venture
     Agreement with a joint teaming agreement to provide for
     the  continuation of joint performance on  the  Pegasus
     and  Taurus  space launch vehicle programs (the  "Joint
     Teaming   Agreement").   The  Joint  Teaming  Agreement
     provides, among other things, that Orbital will perform
     as  the  system  prime contractor for all  present  and
     future  Pegasus  and Taurus missions and  Alliant  will
     perform  as  a  solid rocket motor and payload  fairing
     subcontractor to Orbital on the Pegasus program and  as
     a  solid rocket motor subcontractor to Orbital  on  the
     Taurus  program.   As  a  subcontractor,  Alliant  will
     receive firm-fixed prices for its subcontracts and will
     no  longer  share in contract profits and  losses,  but
     will   share  in  the  costs  and  benefits  associated  
     with     certain      specified    portions  of current
     contracts.   The Joint Teaming Agreement will  continue
     through December 31, 2005, unless terminated earlier by
     mutual agreement.
     
     Orbital   and  Alliant  have  also  agreed   to  release
     all present  and  future claims related to  the    Joint
     Venture Agreement, including (i) a final dismissal  with
     prejudice of the January 1994 lawsuit filed by  Hercules
     against   Orbital   alleging   breaches   of     certain
     representations and warranties by  Orbital  in the  1988
     stock purchase agreement between Hercules and   Orbital,
     and  (ii)  a final dismissal with prejudice of the  July
     1994  lawsuit  filed  by    Hercules    against  Orbital
     alleging breach of  fiduciary  duty  and  breach  of 
     contract in the determination  of  Orbital's  recoverable
     costs  pursuant  to  the  Joint    Venture Agreement.
     
     (9)  Reclassifications
     
     Certain  reclassifications have been made to  the  1994
     condensed consolidated financial statements to  conform
     to the 1995 condensed consolidated  financial statement
     presentation.    The  December  1994   acquisition   of
     Magellan Corporation was recorded using the pooling  of
     interests    method   of   accounting   for    business
     combinations    and,   accordingly,   Orbital's    1994
     historical  financial statements have been restated  to
     reflect this transaction.
     
   ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
               CONDITION AND RESULTS OF OPERATIONS
                                

RESULTS OF OPERATIONS FOR THE THREE- AND SIX-MONTH PERIODS  ENDED
JUNE 30, 1995 AND 1994

The  ORBCOMM  System.   The Company's majority-owned  subsidiary,
Orbital Communications Corporation ("OCC"), and Teleglobe  Mobile
Partners,  an  affiliate of Teleglobe Inc., formed a partnership,
ORBCOMM  Development Partners, L.P. ("ORBCOMM Development"),  for
the  two-phased  design, development, construction,  integration,
test   and   operation   of   a  26-satellite   low-Earth   orbit
communications  system (the "ORBCOMM System").  Pursuant  to  the
terms  of  the  partnership agreement, OCC and  Teleglobe  Mobile
Partners  are  each 50% general partners in ORBCOMM  Development.
Teleglobe   Mobile  has  an  option  to  invest   an   additional
$70,000,000   in   the   next  phase  of   the   ORBCOMM   System
implementation,   and  the  parties  are currently in discussions 
concerning the exercise of such option.

Orbital  and  OCC  are  the primary suppliers  of  communications
satellites,  launch  vehicles, ground  tracking  systems,  system
software  and  integration services to ORBCOMM  Development,  and
successfully launched the first two ORBCOMM System satellites  in
April  1995.   In July 1995, Orbital successfully  completed  on-
orbit  functional  testing of the satellites.  With  the  testing
complete,  ORBCOMM  can  begin conducting communications  testing
with customers in actual operating conditions.
     
Based on its current assessment of the overall business prospects
of  ORBCOMM  Development  and  the ORBCOMM  System,  the  Company
currently  believes  its  investment in  ORBCOMM  Development  of
approximately  $64,000,000  is fully  recoverable.   If,  in  the
future,  implementation  of the ORBCOMM System  is  significantly
delayed,  significantly restricted or abandoned, the Company  may
be required to expense part or all of its investment.

Adoption  of  New Accounting Standard.  The Financial  Accounting
Standards Board recently issued Statement of Financial Accounting
Standards  No. 121, "Accounting for the Impairment of  Long-Lived
Assets  and  Long-Lived Assets to be Disposed  Of"  ("SFAS  121")
which  (i) requires that long-lived assets "to be held and  used"
be   reviewed  for  impairment  whenever  events  or  changes  in
circumstances indicate that the carrying amount of an  asset  may
not  be recoverable, (ii) requires that long-lived assets "to  be
disposed of" be reported at the lower of carrying amount or  fair
value  less  cost  to  sell, and (iii)  provides  guidelines  and
procedures   for   measuring   an  impairment   loss   that   are
significantly different from existing guidelines and procedures.

The Company adopted the provisions of SFAS 121 during the quarter
ended  June 30, 1995.  As a result, as of January 1, 1995 Orbital
recorded  a  cumulative  adjustment for a  change  in  accounting
principle of approximately $4.2 million related to the impairment
in  the carrying amount of certain assets to be disposed of  that
support its orbit transfer vehicle product line.

Revenues.   Orbital's revenues for the three-month periods  ended
June   30,  1995  and  1994  were  $64,589,000  and  $48,365,000,
respectively.   The Company's revenues for the six-month  periods
ended  June  30, 1995 and 1994 were $132,930,000 and $98,675,000,
respectively.

Revenues   from  the  Company's  space  launch  vehicle  products
decreased  to $5,307,000 during the 1995 three-month period  from
$14,152,000  during  the comparable 1994  period.   Space  launch
vehicle  revenues were $11,965,000 and $29,762,000 for  the  six-
month  periods  ended June 30, 1995 and 1994, respectively.   The
significant   decrease  in  revenues  during   the   periods   is
attributable  primarily to the continuing effects  of  production
delays  caused by the Company's failed first launch  of  its  new
Pegasus XL launch vehicle in June 1994, and was impacted to  some
extent  by  the failed second launch of the Pegasus  XL  in  June
1995. Orbital expects revenues during the rest of 1995 to be less
than  1994 as a result of the ongoing failure review process  and
resulting  schedule  delays.  Sales of space launch  vehicles  to
ORBCOMM Development were $1,360,000 and $2,074,000 for the three-
month  periods  ended June 30, 1995 and 1994,  respectively,  and
were  $1,452,000 and $4,150,000 for the 1995 and  1994  six-month
periods, respectively.

Revenues  from  suborbital launch vehicle products  increased  to
$5,772,000  in  the  1995  three-month  period  as  compared   to
$4,529,000   in  the  1994  period.   Suborbital  revenues   were
$11,492,000 and $11,626,000 for the six-month periods ended  June
30,  1995 and 1994, respectively.  While suborbital revenues have
decreased  significantly  during  the  past  few  years  as  U.S.
Government defense spending has been reduced, the Company expects
1995  revenues  to remain approximately consistent  with,  or  to
increase slightly from, revenue levels achieved in 1994.

For  the  three  months ended June 30, 1995,  spacecraft  systems
revenues  increased to $14,382,000 from $4,065,000  in  the  1994
period, and revenues for the six-month period ended June 30, 1995
were $28,901,000 as compared to $11,043,000 in the same period in
1994.  The increase in spacecraft system sales is primarily as  a
result  of  additional  revenues  generated  from  the  Company's
Germantown operations, acquired in August 1994 (the "August  1994
Acquisition").   The 1995 and 1994 three-month  periods  included
$1,535,000  and $1,414,000, respectively, in sales  of  MicroStar
spacecraft  to  ORBCOMM  Development and  the  six-month  periods
included  $3,395,000 and $4,496,000 in such sales,  respectively.
Revenues generated from sales of space sensors and instruments of
$3,062,000  during the 1995 quarter decreased from the comparable
1994  quarter sales of $5,386,000.  Space sensors and instruments
sales  were $6,547,000 and $8,773,000 for the 1995 and 1994  six-
month  periods,  respectively, and are expected to  remain  lower
than 1994 levels throughout 1995.

Revenues  from  defense  electronics and avionics  products  were
approximately $14,327,000 for the three-month period  ended  June
30,  1995 as compared to $2,639,000 in the 1994 period.   Defense
electronics  and  avionics products sales  were  $29,790,000  and
$5,860,000  in the 1995 and 1994 six-month periods, respectively.
The  Company  acquired these products as part of the August  1994
Acquisition  and the September 1993 acquisition  of  the  Applied
Science Operation of The Perkin-Elmer Corporation.

Revenues  from  sales  of  navigation  and  positioning  products
increased to $12,573,000 for the three months ended June 30, 1995
as compared to $9,631,000 for the 1994 period, and to $26,459,000
for the six months ended June 30, 1995 as compared to $18,553,000
for  the  1994  period,  primarily due to  increased  unit  sales
offset, in part, by lower unit prices for GPS navigators.

Revenues  from the Company's newly established Advanced  Projects
Group  were  $5,840,000 during the second quarter  of  1995  (and
$9,404,000  for  the  first half of 1995) as  a  result  of  work
performed under a cooperative agreement with NASA awarded earlier
in  1995  for  the  development of a new  small  reusable  launch
vehicle  and  work  under a contract with the  U.S.  Government's
Advanced  Research Projects Agency, completed in April 1995,  for
the  study of a new advanced unmanned, long-duration, high-flying
aircraft.

Gross  Profit.   Gross  profit depends on a  number  of  factors,
including the Company's mix of contract types and costs  incurred
thereon  in  relation  to estimated costs.  The  Company's  gross
profit  for the three-month periods ended June 30, 1995 and  1994
were $16,783,000 and $10,771,000, respectively.  Gross profit for
the   six-month  periods  ended  June  30,  1995  and  1994   was
$35,637,000  and $25,052,000, respectively.  Gross profit  margin
as  a  percentage of sales was approximately 26.0% and 22.3%  for
the   three-month  periods  ended  June  30,   1995   and   1994,
respectively,  and  26.8% and 25.4%, for  the  six-month  periods
ended  June 30, 1995 and 1994, respectively.  The increased gross
profit margin during 1995 was primarily attributable to increased
margins  for  spacecraft systems and navigation  and  positioning
products, offset in part by cost increases on the Pegasus program
as  a result of the Pegasus XL failures in June of 1994 and 1995.
The  Company  believes  that  its gross  profit  margin  for  the
remainder of 1995 will increase slightly as compared to the first
half of 1995.

Research  and  Development  Expenses.  Research  and  development
expenses  represent  Orbital's  self-funded  product  development
activities,   and  exclude  direct  customer-funded  development.
Research and development expenses during the three-month  periods
ended  June  30,  1995 and 1994 were $4,932,000  and  $2,808,000,
respectively.  Research and development expenses for the 1995 and
1994   six-month   periods   were  $8,764,000   and   $6,506,000,
respectively.  Research and development expenses in  1995  relate
primarily  to  the  development of  new  or  improved  navigation
products  and  development efforts on the  Company's  Pegasus  XL
program,  and  include estimated expenses related to  the  recent
Pegasus  XL  failure.   The  Company  expects  its  research  and
development  expenditures for the rest of 1995 to  be  consistent
with second half 1994 expenditures.

Selling, General and Administrative Expenses.   Selling,  general
and  administrative  expenses include  the  costs  of  marketing,
advertising, promotional and other selling expenses  as  well  as
the  costs  of the finance, administrative and general management
functions  of  the Company.  Selling, general and  administrative
expenses  for the three months ended June 30, 1995 and 1994  were
$11,497,000  (or 17.8% of revenues) and $7,215,000 (or  14.9%  of
revenues),  respectively.   Selling, general  and  administrative
expenses  for  the six months ended June 30, 1995 and  1994  were
$22,707,000 (or 17.1% of revenues) and $14,472,000 (or  14.7%  of
revenues),  respectively.  The increase in selling,  general  and
administrative  expenses  during 1995 as  compared  to  1994  was
primarily  attributable to expanded marketing efforts related  to
the Company's ORBCOMM project ($3,304,000 of expenses in 1995  as
compared  to  $1,714,000 in 1994) and to various  remote  sensing
systems  ($408,000  of  expenses in 1995  with  no  corresponding
expenses   in   1994),  and  to  the  August   1994   Acquisition
($12,188,000 of expenses in 1995).  The Company expects  selling,
general  and administrative expenses as a percentage of  revenues
during  the  remainder of 1995 to be less than  or  approximately
equal to those in the first half of 1995.

Interest  Income and Interest Expense.  Net interest expense  was
$1,119,000  for the three months ended June 30, 1995 as  compared
to  net interest income of $420,000 during the 1994 quarter.  Net
interest expense for the 1995 six-month period was $1,887,000  as
compared  to  $931,000 of net interest income for the  1994  six-
month  period.  Interest income for the periods reflects interest
earnings   on  short-term  investments.   Interest   expense   is
primarily  for outstanding amounts on Orbital's revolving  credit
facility, on the Company's public debentures and, during 1995, on
acquisition  debt  incurred in connection with  the  August  1994
Acquisition.   Interest expense has been reduced  by  capitalized
interest of $1,330,000 and $1,275,000 for the 1995 and 1994 three-
month periods, respectively, and by $2,533,000 and $2,517,000 for
the 1995 and 1994 six-month periods, respectively.

Equity  in  Earnings (Losses) of Affiliates.  Equity in  earnings
(losses) of affiliates for the three-month periods ended June 30,
1995 and 1994 of ($65,000) and ($121,000), respectively, and  for
the  six-month  periods  ended June  30,  1995  of  $362,000  and
($544,000), respectively, represents elimination of  50%  of  the
profits on sales to ORBCOMM Development, as well as the Company's
pro  rata  share of ORBCOMM Development's current period earnings
and  losses.   During the construction phase of the  project  and
prior   to  the  commencement  of  planned  operations,   ORBCOMM
Development   is  capitalizing  substantially  all  construction-
related  costs and is expensing as incurred all selling,  general
and administrative costs as period costs.

Provision for Income Taxes.  A provision for income taxes was not
necessary  for  the  six months ended June  30,  1995  given  the
Company's  reported  operating losses.  The Company  recorded  an
income tax provision of $101,000 and $917,000 for the three-  and
six-month periods ended June 30, 1994, respectively.  The Company
records  its interim income tax provisions based on estimates  of
the  Company's  effective tax rate expected to be applicable  for
the  full fiscal year.  Estimated effective rates recorded during
interim  periods  may be periodically revised, if  necessary,  to
reflect current estimates.

At  December 31, 1994, Orbital had approximately $50,000,000  and
$900,000  of  net  operating loss and tax  credit  carryforwards,
respectively,  which are available to reduce  future  income  tax
obligations,  subject  to certain annual  limitations  and  other
restrictions.


LIQUIDITY AND CAPITAL RESOURCES

The  Company's  growth has required substantial capital  to  fund
both  an  expanding  business base and significant  research  and
development  and capital investment expenditures.   Additionally,
the  Company  has  historically made  strategic  acquisitions  of
businesses   and   routinely  evaluates   potential   acquisition
candidates.  The Company expects to continue to pursue  potential
acquisitions  that  it  believes  would  augment  its  marketing,
technical, manufacturing or financial capabilities.  The  Company
has  funded these requirements to date, and expects to  fund  its
requirements in the future, through cash generated by operations,
working  capital  loan facilities, asset-based financings,  joint
venture  arrangements,  and private and public  equity  and  debt
offerings.

During  the quarter ended June 30, 1995, Orbital entered  into  a
$20  million fixed-rate unsecured debt financing arrangement with
a  private insurance company.  The debt has a six-year  term  and
bears  interest  at  10  1/2% per annum.   The  debt  arrangement
restricts the payment of dividends and contains certain covenants
with  respect  to  the  Company's working capital,  fixed  charge
ratio,  leverage ratio and tangible net worth.  Additionally,  in
June  1995,  the  Company completed a private  placement  of  two
million  shares  of its Common Stock, receiving net  proceeds  of
approximately $32 million.  The Company's shares were placed with
various  offshore  institutional investors and the  issuance  was
exempt  from public registration pursuant to Regulation S of  the
Securities  Act  of  1933, as amended.  In August  1994,  Orbital
issued secured notes totaling approximately $24,200,000 to  eight
financial  institutions, to support the August 1994  Acquisition.
The  notes have an average interest rate of approximately 8  3/4%
and  generally mature on a monthly basis over a three-  to  five-
year period.

Cash,   cash   equivalents   and  short-term   investments   were
$39,817,000 at June 30, 1995, and the Company had short-term  and
long-term   debt   obligations   outstanding   of   approximately
$106,955,000.  The outstanding debt relates primarily to advances
under the Company's line of credit facility, secured notes issued
in  connection with the August 1994 Acquisition, unsecured  notes
issued  in 1995, fixed asset financings and the Company's  public
debentures.   During  the quarter ended June  30,  1995,  Orbital
converted,  at  a  premium,  approximately  $3,000,000   of   its
convertible   debentures   at  the  request  of certain debenture
holders, issuing approximately 209,000 shares of Common Stock.

The  Company's  revolving  credit  facility  provides  for  total
borrowings from an international syndicate of six banks of up  to
$65,000,000,  subject to a defined borrowing  base  comprised  of
certain   contract  receivables.   Approximately  $6,113,000   of
borrowings were outstanding under the facility at June 30,  1995,
against an available facility limit of approximately $25,491,000.
At  June  30,  1995,  the average interest  rate  on  outstanding
borrowings   under   this   facility  was   approximately   8.2%.
Borrowings are secured by contract receivables and certain  other
assets.   The  facility restricts the payment  of  dividends  and
contains certain covenants with respect to the Company's  working
capital,  fixed  charge ratio, leverage ratio  and  tangible  net
worth, and expires in September 1997.

The   Company's   operations  used  net  cash  of   approximately
$8,466,000  in the six months ended June 30, 1995.   The  Company
also  incurred approximately $9,689,000 of investment related  to
the ORBCOMM System and $9,854,000 in capital expenditures related
primarily to spacecraft production and test equipment.

Orbital's   capital  expenditures  for  1995  are   expected   to
approximate 1994 and 1993 levels, including continued investments
in  space  launch  vehicle and spacecraft production,  test,  and
airborne  and  ground  support equipment.  Additionally,  Orbital
expects  to  invest up to $10,000,000 in various ORBIMAGE  remote
sensing  projects.  Assuming that Teleglobe Mobile exercises  its
option to invest in the next phase of the ORBCOMM System, Orbital
intends to invest approximately $5,000,000 in the ORBCOMM  System
over  the next two years.  In the event Teleglobe Mobile  chooses
not  to  exercise its option to invest in the next phase  of  the
project and Orbital desires to proceed, additional investment  by
Orbital  or  that  of  other  potential  investors  could  exceed
$80,000,000 over the next two years.

Orbital  expects  that its 1995 capital needs  for  its  existing
operations,  including its planned $5,000,000 investment  in  the
ORBCOMM System, will in part be provided by working capital, cash
flows from operations, credit facilities, asset-based financings,
customer    financings   and   operating   lease    arrangements.
Additionally,  as part of a joint venture to be partially  funded
by  NASA  and  Rockwell  International Corporation,  Orbital  has
committed to invest at least $67,500,000 in the development of  a
new  small  reusable  launch vehicle, which  investment  will  be
required  over  the  next  four  years,  including  approximately
$5,000,000  in  1995.   Orbital  believes  that  it  may  require
additional  equity  and/or  debt  financing  to  fund  fully  its
currently  planned operations and capital requirements,  to  meet
its  potential increased investment in the ORBCOMM System and  to
meet its investment requirements for the new launch vehicle.

On  July  31, 1995, Orbital signed a letter of intent to  acquire
MacDonald,  Dettwiler  and Associates  Ltd.  ("MDA"),  a  leading
supplier of commercial remote sensing ground stations, located in
Vancouver,  British  Columbia.   During  its  recently  completed
fiscal  year  ended March 31, 1995, MDA reported  net  income  of
approximately   US  $5,500,000  on  sales  of  approximately   US
$80,000,000.  Pursuant to the terms of the preliminary agreement,
Orbital  will  exchange  approximately 3,600,000  shares  of  its
Common  Stock  for  all of MDA's outstanding common  stock.   The
transaction  is  to  be accounted for as a pooling  of  interests
combination and is expected to be completed later in 1995.

                             PART II
                                
                        OTHER INFORMATION
                                
                                
ITEM 1.   LEGAL PROCEEDINGS
          
          Not applicable.
          
ITEM 2.   CHANGES IN SECURITIES

          Not applicable.
          
ITEM 3.   DEFAULTS UPON SENIOR SECURITIES

          Not applicable.

ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITIES HOLDERS

                     (a)  The annual meeting of stockholders
               of the Company was held on April 27, 1995.

                    (b)  Not applicable.

                (c)  (i)   Election of five directors,  each
          serving for a three-year term:

               Fred C. Alcorn

                 Votes:  For:        16,447,193        Against:  0
                         Withheld:  102,969           Abstain: 0
                         Broker Non-Votes:  0

               Lennard A. Fisk

                 Votes:  For:        16,443,042         Against:  0
                         Withheld: 107,120             Abstain: 0
                         Broker Non-Votes:  0

               Jack L. Kerrebrock

                 Votes:  For:        16,447,643        Against:  0
                         Withheld:  102,519           Abstain: 0
                         Broker Non-Votes:  0

               David W. Thompson

                 Votes:  For:        16,451,464        Against:  0
                         Withheld:  98,698            Abstain: 0
                         Broker Non-Votes:  0

               James R. Thompson

                 Votes:  For:        16,451,363        Abstain:  0
                         Withheld:  98,799            Abstain: 0
                         Broker Non-Votes:  0

                    (ii) Proposal to approve the increase in  the
               number  of  shares of common stock authorized  for
               issuance  under  the 1990 Stock Option  Plan  from
               2,000,000 to 2,975,000 shares.

               Votes:   For:  9,607,196                  Against:  1,846,991
                          Withheld:  0                   Abstain:  193,249
                         Broker Non-Votes:  4,902,726

                    (iii)      Proposal approving  amendments  to
               the   1990  Stock  Option  Plan  for  Non-Employee
               Directors  to  increase the option exercise  price
               to  100% of the fair market value; to increase the
               number  of  shares  of common stock  automatically
               granted  annually to 3,000 shares; and to increase
               the  number  of shares of common stock  authorized
               for issuance to 170,000 shares.

                 Votes:  For:        10,799,307     Against:  578,459
                          Withheld:  0               Abstain: 269,670
                         Broker Non-Votes:  4,902,726

                     (iv)   Ratification  of  selection  of   the
               Company's independent auditors.

                 Votes:  For:        16,377,182     Against:   61,786
                          Withheld:  0               Abstain: 111,194
                         Broker Non-Votes:  0

          (d)  Not applicable.
          
ITEM 5.   OTHER INFORMATION

          Not Applicable.

ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

          (a)  Exhibits - A complete listing of exhibits required
               is  given  in the Exhibit Index that precedes  the
               exhibits filed with this report.
<PAGE>

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

                                   ORBITAL SCIENCES CORPORATION


DATED:  August  14, 1995           By: /s/ David W. Thompson
                                     David    W.   Thompson,President
                                     and   Chief   Executive Officer


DATED:  August  14, 1995            By: /s/ Carlton B. Crenshaw
                                      Carlton   B.   Crenshaw, Senior
                                      Vice President and Principal
                                       Financial Officer


<PAGE>


                          EXHIBIT INDEX
                                
                                
     The following exhibits are filed as part of this report.

 Exhibit                         Description
   No.                                
  4.7.1   Promissory Note dated as of June 14, 1995 made by
          Corporation and The Northwestern Mutual Life Insurance
          Company (transmitted herewith).
  4.7.2   Note  Agreement  dated as of June 14,  1995  between  the
          Corporation  and The Northwestern Mutual  Life  Insurance
          Company (transmitted herewith).
  10.5.1  Orbital Sciences Corporation 1990 Stock Option Plan,
          restated as of April 27, 1995 (transmitted herewith).
  10.5.2  Orbital Sciences Corporation 1990 Stock Option Plan for
          Non-Employee Directors, restated as of April 27, 1995
          (transmitted herewith).
  10.6.3  Amendment No. 2 dated July 5, 1995 to the Credit
          Agreement dated September 27, 1994 among the Company,
          Orbital Imaging Corporation and Fairchild Space and
          Defense Corporation, the Banks listed therein, Morgan
          Guaranty Trust Company of New York, as Administrative
          Agent, and J.P. Morgan Delaware, as Collateral Agent
          (transmitted herewith).
    11    Statement re:  Computation of Earnings Per Share
          (transmitted herewith).
    27    Financial Data Schedule (such schedule is furnished for
          the information of the Securities and Exchange
          Commission and is not to be deemed "filed" as part of
          the Form 10-Q, or otherwise subject to the liabilities
          of Section 18 of the Securities Exchange Act of 1934)
          (transmitted herewith).





                      Orbital Sciences Corporation
                                    
                                    
                           10.50% Senior Note
                            Due June 14, 2001
                                    
                                    
No. R-1                                                     June 14, 1995

$20,000,000
     
     
     ORBITAL   SCIENCES   CORPORATION,  a   Delaware   corporation   (the
"Company"), for value received, hereby promises to pay to

             The Northwestern Mutual Life Insurance Company

                          or registered assigns
                         the principal amount of

                  Twenty Million Dollars ($20,000,000)

and to pay interest (computed on the basis of a 360-day year of twelve 30-
day  months)  on the principal amount from time to time remaining  unpaid
hereon  at  the  rate  of  10.50% per annum from the  date  hereof  until
maturity, payable semiannually on the fourteenth of June and December  in
each year (commencing on December 14, 1995) and at maturity.  The Company
agrees  to  pay  interest  on overdue principal  (including  any  overdue
required  or optional prepayment of principal) and premium, if  any,  and
(to  the  extent  legally  enforceable) on  any  overdue  installment  of
interest,  at  the  rate  Overdue Rate after the  due  date,  whether  by
acceleration  or otherwise, until paid.  "Overdue Rate"  shall  mean  the
lesser  of  (a) the maximum interest rate permitted by law  and  (b)  the
greater  of  (1) 12.50% per annum and (2) the rate which Morgan  Guaranty
Trust  Company of New York, New York City, New York, announces from  time
to  time  as its prime lending rate as in effect from time to time,  plus
2%.
     
     Both  the  principal hereof and interest hereon are payable  at  the
principal  office of the Company in Dulles, Virginia in coin or  currency
of  the  United States of America which at the time of payment  shall  be
legal  tender for the payment of public and private debts.  If any amount
of  principal, premium, if any, or interest on or in respect of this Note
becomes  due  and payable on any date which is not a Business  Day,  such
amount  shall  be  payable  on the immediately  preceding  Business  Day.
"Business  Day" means any day other than a Saturday, Sunday or other  day
on  which banks in Dulles, Virginia or New York, New York are required by
law to close or are customarily closed.
     
     This  Note is one of the 10.50% Senior Notes due June 14, 2001  (the
"Notes")  of the Company in the aggregate principal amount of $20,000,000
issued or to be issued under and pursuant to the terms and provisions  of
the  Note  Agreement  dated as of June 1, 1995  (the  "Note  Agreement"),
entered  into by the Company with the original Purchaser therein referred
to  and  this Note and the holder hereof are entitled equally and ratably
with  the holders of all other Notes outstanding under the Note Agreement
to  all  the  benefits  provided  for thereby  or  referred  to  therein.
Reference  is hereby made to the Note Agreement for a statement  of  such
rights and benefits.
     
     This  Note  and the other Notes outstanding under the Note Agreement
may  be  declared due prior to their expressed maturity date and  certain
prepayments  are required to be made thereon, all in the events,  on  the
terms and in the manner and amounts as provided in the Note Agreement.
     
     The  Notes are not subject to prepayment or redemption at the option
of  the  Company prior to their expressed maturity dates  except  on  the
terms and conditions and in the amounts and with the premium, if any, set
forth in the Note Agreement.
     
     This  Note  is  registered  on  the books  of  the  Company  and  is
transferable  only by surrender thereof at the principal  office  of  the
Company  duly endorsed or accompanied by a written instrument of transfer
duly  executed by the registered holder of this Note or its attorney duly
authorized  in writing.  Payment of or on account of principal,  premium,
if any, and interest on this Note shall be made only to or upon the order
in writing of the registered holder.
     
     This  Note and said Note Agreement are governed by and construed  in
accordance   with  the  laws  of  Illinois,  including  all  matters   of
construction, validity and performance.

                                    Orbital Sciences Corporation



                                    By   /s/ Carlton B. Crenshaw
                                      Its  Sr. Vice President/Finance
                                       and Administration and Treasurer











                                    
                      Orbital Sciences Corporation
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                             Note Agreement
                                    
                                    
                                    
                                    
                                    
                                    
                        Dated as of June 1, 1995


     
     
     Re:            $20,000,000 10.50% Senior Notes
                            Due June 14, 2001








                            Table of Contents
                                    
                      (Not a part of the Agreement)
Section 1.Description of Notes and Commitment              1
   Section 1.1. Description of Notes                     1
   Section 1.2. Commitment, Closing Date                 1
Section 2.Prepayment of Notes                              2
   Section 2.1. Required Prepayments                     2
   Section 2.2. Optional Prepayment with Premium         2
   Section 2.3. Prepayment of Notes upon Change of Control2
   Section 2.4. Notice of Optional Prepayments           4
   Section 2.5. Application of Prepayments               4
   Section 2.6. Direct Payment                           4
Section 3.Representations                                  5
   Section 3.1. Representations of the Company           5
   Section 3.2. Representations of the Purchaser         5
Section 4.Closing Conditions                               5
   Section 4.1. Conditions                               5
   Section 4.2. Waiver of Conditions                     6
Section 5.Company Covenants                                7
   Section 5.1. Corporate Existence, Etc                 7
   Section 5.2. Insurance                                7
   Section 5.3. Taxes, Claims for Labor and Materials; Compliance with
                 Laws                                     7
   Section 5.4. Maintenance, Etc                         8
   Section 5.5. Nature of Business                       8
   Section 5.6. Consolidated Tangible Net Worth          8
   Section 5.7. Consolidated Funded Debt Maintenance Ratio8
   Section 5.8. Fixed Charges Coverage Ratio             8
   Section 5.9. Priority Funded Debt Ratio               9
   Section 5.10.Limitation on Liens                      9
   Section 5.11.Restricted Investments                  10
   Section 5.12.Restricted Payments                     11
   Section 5.13.Mergers, Consolidations and Sales of Assets  12
   Section 5.14.Repurchase of Notes                     16
   Section 5.15.Transactions with Affiliates            16
   Section 5.16.Termination of Pension Plans            16
   Section 5.17.Reports and Rights of Inspection        17
Section 6.Events of Default and Remedies Therefor         20
   Section 6.1. Events of Default                       20
   Section 6.2. Notice to Holders                       21
   Section 6.3. Acceleration of Maturities              22
   Section 6.4. Rescission of Acceleration              22
Section 7.Amendments, Waivers and Consents                23
   Section 7.1. Consent Required                        23
   Section 7.2. Solicitation of Holders                 23
   Section 7.3. Effect of Amendment or Waiver           23
Section 8.Interpretation of Agreement; Definitions        23
   Section 8.1. Definitions                             23
   Section 8.2. Accounting Principles                   37
   Section 8.3. Directly or Indirectly                  37
Section 9.Miscellaneous                                   37
   Section 9.1. Registered Notes                        37
   Section 9.2. Exchange of Notes                       37
   Section 9.3. Loss, Theft, Etc. of Notes              38
   Section 9.4. Expenses, Stamp Tax Indemnity           38
   Section 9.5. Powers and Rights Not Waived; Remedies Cumulative 38
   Section 9.6. Notices                                 39
   Section 9.7. Successors and Assigns                  39
   Section 9.8. Survival of Covenants and Representations39
   Section 9.9. Severability                            39
   Section 9.10.Governing Law                           39
   Section 9.11.Captions                                39
Signature  40




Attachments to Note Agreement:


Schedule I   Name and Address of Purchaser and Amount of Commitment

Schedule II    Funded Debt; Liens Securing Funded Debt (including
               Capitalized Leases); and Subsidiaries as of the Closing
               Date

Schedule III Use of Proceeds

Exhibit A    Form of 10.50% Senior Note due June 14, 2001

Exhibit B    Representations and Warranties of the Company

Exhibit C    Description of Special Counsel's Closing Opinion

Exhibit D    Description of Closing Opinion of Counsel to the Company

                      Orbital Sciences Corporation
                        21700 Atlantic Boulevard
                         Dulles, Virginia  20166
                                    
                                    
                             Note Agreement
                                    
                                    
                  Re:  $20,000,000 10.50% Senior Notes
                            Due June 14, 2001
                                                                         
                                                              Dated as of
                                                             June 1, 1995


To the Purchaser named in Schedule I"
  hereto which is a signatory of this
  Agreement

Ladies and Gentlemen:
     
     The   undersigned,   Orbital  Sciences   Corporation,   a   Delaware
corporation (the "Company"), agrees with you as follows:


Section1.Description of Notes and Commitment.

Section1.1.Description of Notes.  The Company will  authorize  the  issue
and  sale of $20,000,000 aggregate principal amount of its 10.50%  Senior
Notes (the "Notes") to be dated the date of issue, to bear interest  from
such  date at the rate of 10.50% per annum, payable semiannually  on  the
fourteenth day of June and December in each year (commencing December 14,
1995)  and  at  maturity  and  to  bear  interest  on  overdue  principal
(including any overdue required or optional prepayment of principal)  and
premium,  if any, and (to the extent legally enforceable) on any  overdue
installment  of interest at the Overdue Rate after the date due,  whether
by  acceleration or otherwise, until paid, to be expressed to  mature  on
June  14,  2001, and to be substantially in the form attached  hereto  as
Exhibit A.  Interest on the Notes shall be computed on the basis of a 360-
day  year  of  twelve  30-day  months.  The  Notes  are  not  subject  to
prepayment  or  redemption at the option of the Company  prior  to  their
expressed  maturity date except on the terms and conditions  and  in  the
amounts  and with the premium, if any, set forth in 2 of this  Agreement.
The  term  "Notes"  as  used  herein shall include  each  Note  delivered
pursuant to this Agreement.  You are hereinafter sometimes referred to as
the  "Purchaser".  The terms which are capitalized herein shall have  the
meanings set forth in 8.1 unless otherwise defined herein.

Section1.2.Commitment, Closing Date.  Subject to the terms and conditions
hereof and on the basis of the representations and warranties hereinafter
set forth, the Company agrees to issue and sell to you, and you agree  to
purchase  from  the  Company,  Notes in the principal  amount  set  forth
opposite  your  name  on Schedule I hereto at a  price  of  100%  of  the
principal amount thereof on the Closing Date hereafter mentioned.
     
     Delivery  of  the Notes will be made at the offices of  Chapman  and
Cutler,  111 West Monroe Street, Chicago, Illinois 60603, against payment
therefor  in  Federal  Reserve  or other funds  current  and  immediately
available at the principal office of Chapman and Cutler, 111 West  Monroe
Street,  Chicago, Illinois 60603, in the amount of the purchase price  at
10:00  A.M., Chicago time, on June 14, 1995 or such later date  as  shall
mutually  be  agreed upon by the Company and the Purchaser (the  "Closing
Date").  The Notes delivered to you on the Closing Date will be delivered
to  you  in  the  form of a single registered Note in the  form  attached
hereto  as  Exhibit  A  for  the full amount  of  your  purchase  (unless
different denominations are specified by you), registered in your name or
in  the  name of such nominee, as may be specified in Schedule I attached
hereto.


Section2.Prepayment of Notes.

Section2.1.Required  Prepayments.   In  addition  to  paying  the  entire
outstanding  principal amount and the interest due on the  Notes  on  the
maturity date thereof, the Company agrees that on June 14, 1999 and  June
14, 2000, it will prepay and apply and there shall become due and payable
on  the principal indebtedness evidenced by the Notes an amount equal  to
the  lesser  of (a) $6,666,667 or (b) the principal amount of  the  Notes
then  outstanding.  The entire remaining principal amount  of  the  Notes
shall  become  due  and payable on June 14, 2001.  No  premium  shall  be
payable in connection with any required prepayment made pursuant to  this
2.1.
     
     In  the  event that the Company shall prepay less than  all  of  the
Notes  pursuant  to  2.2 or 2.3 hereof, the amounts  of  the  prepayments
required  by  this 2.1 shall be reduced by an amount which  is  the  same
percentage  of  such  required prepayment  as  the  percentage  that  the
principal  amount  of Notes prepaid pursuant to 2.2  or  2.3  is  of  the
aggregate principal amount of outstanding Notes immediately prior to such
prepayment.

Section2.2.Optional Prepayment with Premium.  In addition to the payments
required  by  2.1, upon compliance with 2.4, the Company shall  have  the
privilege, on any date on which interest is payable pursuant to  1.1,  of
prepaying  the outstanding Notes, either in whole or in part (but  if  in
part then in a minimum principal amount of $2,000,000), by payment of the
principal  amount  of the Notes, or portion thereof to  be  prepaid,  and
accrued interest thereon to the date of such prepayment, together with  a
premium  equal  to the Make-Whole Amount, determined as of  two  Business
Days prior to the date of such prepayment pursuant to this 2.2.

Section2.3.Prepayment of Notes upon Change of Control.  (a) In the  event
that  the Company shall have knowledge of any proposed Change of Control,
the  Company will give written notice of such fact in the manner provided
in  9.6  hereof  to  the holders of the Notes describing  the  facts  and
circumstances of such proposed Change of Control and estimating the  date
on  which the Company expects that such Change of Control will occur.  In
the  event that any Change of Control shall occur, the Company will  give
written notice (the "Company Notice") of such fact in the manner provided
in  9.6 hereof to the holders of the Notes.  The Company Notice shall  be
delivered promptly upon receipt of such knowledge by the Company  and  in
any  event no later than three Business Days following the occurrence  of
any  Change of Control.  The Company Notice shall (1) describe the  facts
and  circumstances  of such Change of Control in reasonable  detail,  (2)
make  reference to this 2.3 and the right of the holders of the Notes  to
require prepayment of the Notes on the terms and conditions provided  for
in  this  2.3,  (3)  offer  in writing to prepay the  outstanding  Notes,
together  with accrued interest to the date of prepayment, and a  premium
equal  to the then applicable Make-Whole Amount, and (4) specify  a  date
for  such  prepayment  (the "Change of Control Prepayment  Date"),  which
Change of Control Prepayment Date shall be not more than 90 days nor less
than  30 days following the date of such Company Notice.  Each holder  of
the  then outstanding Notes shall have the right to accept such offer and
require  prepayment of the Notes held by such holder in full  by  written
notice  to  the Company (a "Noteholder Notice") given not later  than  20
days  after  receipt  of the Company Notice.  The Company  shall  on  the
Change of Control Prepayment Date prepay in full all of the Notes held by
holders  which have so accepted such offer of prepayment.  The prepayment
price  of the Notes payable upon the occurrence of any Change of  Control
shall  be an amount equal to 100% of the outstanding principal amount  of
the  Notes so to be prepaid and accrued interest thereon to the  date  of
such  prepayment,  together with a premium equal to the  then  applicable
Make-Whole Amount, determined as of two Business Days prior to  the  date
of such prepayment pursuant to this 2.3(a).

    (b)   (1) Without limiting the foregoing, notwithstanding any failure
on  the part of the Company to give the Company Notice herein required as
a  result  of the occurrence of a Change of Control, each holder  of  the
Notes  shall have the right by delivery of written notice to the  Company
to  require  the  Company to prepay, and the Company  will  prepay,  such
holder's  Notes  in full, together with accrued interest thereon  to  the
date of prepayment, and a premium equal to the then applicable Make-Whole
Amount.   Notice  of any required prepayment pursuant to  this  2.3(b)(1)
shall be delivered by any holder of the Notes which was entitled to,  but
did not receive, such Company Notice to the Company after such holder has
actual knowledge of such Change of Control.  On the date (the "Change  of
Control  Delayed  Prepayment Date") designated in  such  holder's  notice
(which shall be not more than 90 days nor less than 30 days following the
date  of such holder's notice), the Company shall prepay in full  all  of
the Notes held by such holder, together with accrued interest thereon  to
the  date of prepayment, and a premium equal to the then applicable Make-
Whole  Amount.   If the holder of any Note gives any notice  pursuant  to
this  2.3(b)(1),  the  Company shall give a Company Notice  within  three
Business  Days  of  receipt of such notice and  identify  the  Change  of
Control  Delayed Prepayment Date to all other holders of  the  Notes  and
each  of  such other holders shall then and thereupon have the  right  to
accept  the  Company's offer to prepay the Notes held by such  holder  in
full  and  require prepayment of such Notes by delivery of  a  Noteholder
Notice  within 20 days following receipt of such Company Notice; provided
only  that  any date for prepayment of such holder's Notes shall  be  the
Change  of  Control  Delayed Prepayment Date.  On the Change  of  Control
Delayed  Prepayment Date, the Company shall prepay in full the  Notes  of
each  holder  thereof which has accepted such offer of  prepayment  at  a
prepayment price equal to 100% of the outstanding principal amount of the
Notes  so to be prepaid and accrued interest thereon to the date of  such
prepayment,  together with a premium equal to the then  applicable  Make-
Whole  Amount, determined as of two Business Days prior to  the  date  of
such prepayment pursuant to this 2.3(b)(1).

     (2)    Compliance with the provisions of this 2.3(b)  shall  not  be
deemed to constitute a waiver of, or consent to, any Default or Event  of
Default caused by any violation of the provisions of 2.3(a).

Section2.4.Notice of Optional Prepayments.  The Company will give  notice
of  any  prepayment of the Notes pursuant to 2.2 to each  holder  thereof
not  less  than 30 days nor more than 60 days before the date  fixed  for
such  optional  prepayment specifying (a) such date,  (b)  the  principal
amount  of  the  holder's Notes to be prepaid on such date,  (c)  that  a
premium  may  be  payable,  (d)  the  date  when  such  premium  will  be
calculated,  (e)  the  estimated  premium,  together  with  a  reasonably
detailed  computation  of such estimated premium,  and  (f)  the  accrued
interest  applicable to the prepayment.  Such notice of prepayment  shall
also  certify  all facts, if any, which have given rise to the  Company's
right  or  obligation to make any such prepayment.  Notice of  prepayment
having  been  so  given,  the aggregate principal  amount  of  the  Notes
specified in such notice, together with accrued interest thereon and  the
premium,  if  any,  payable with respect thereto  shall  become  due  and
payable  on  the prepayment date specified in said notice.  Two  Business
Days  prior to the prepayment date specified in such notice, the  Company
shall  provide  each holder of a Note written notice of the  premium,  if
any,  payable in connection with such prepayment and, whether or not  any
premium  is  payable, a reasonably detailed computation of the Make-Whole
Amount.

Section2.5.Application  of  Prepayments.  All  partial  prepayments  made
pursuant  to  2.1  or  2.2  shall be applied  on  all  outstanding  Notes
ratably  in  accordance with the unpaid principal amounts  thereof.   All
partial  prepayments made pursuant to 2.3 shall be applied  only  to  the
Notes of the holders who have elected to participate in such prepayment.

Section2.6.Direct  Payment.  Notwithstanding  anything  to  the  contrary
contained  in this Agreement or the Notes, in the case of any Note  owned
by  you  or your nominee or owned by any subsequent Institutional  Holder
which  has  given  written  notice to the  Company  requesting  that  the
provisions of this 2.6 shall apply, the Company will punctually pay  when
due the principal thereof, interest thereon and premium, if any, due with
respect  to said principal, without any presentment thereof, directly  to
you,  to your nominee or to such subsequent Institutional Holder at  your
address or your nominee's address set forth in Schedule I hereto or  such
other  address  as  you,  your nominee or such  subsequent  Institutional
Holder may from time to time designate in writing to the Company or, if a
bank  account  with a United States bank is designated for  you  or  your
nominee on Schedule I hereto or in any written notice to the Company from
you,  from your nominee or from any such subsequent Institutional Holder,
the  Company  will make such payments in immediately available  funds  to
such bank account, no later than 11:00 a.m. Chicago, Illinois time on the
date  due, marked for attention as indicated, or in such other manner  or
to  such other account in any United States bank as you, your nominee  or
any such subsequent Institutional Holder may from time to time direct  in
writing.  If for any reason whatsoever the Company does not make any such
payment by such 11:00 a.m. transmittal time, such payment shall be deemed
to  have  been  made on the next following Business Day and such  payment
shall bear interest at the Overdue Rate.


Section3.Representations.

Section3.1.Representations of the Company.  The  Company  represents  and
warrants  that all representations and warranties set forth in Exhibit  B
are true and correct as of the date hereof and are incorporated herein by
reference  with the same force and effect as though herein set  forth  in
full.

Section3.2.Representations of the Purchaser.  (a) You represent,  and  in
entering  into  this  Agreement the Company  understands,  that  you  are
acquiring the Notes for the purpose of investment and not with a view  to
the  distribution  thereof, and that you have  no  present  intention  of
selling,  negotiating  or otherwise disposing  of  the  Notes;  it  being
understood, however, that the disposition of your property shall  at  all
times be and remain within your control.

     (b)   You further represent that either:  (1) you are acquiring  the
Notes  with assets from your general account and not with the  assets  of
any separate account in which any employee benefit plan has any interest;
(2)  no  part  of  the  funds to be used by you  to  purchase  the  Notes
constitutes  assets allocated to any separate account maintained  by  you
such  that  the  application  of  such  funds  constitutes  a  prohibited
transaction  under Section 406 of ERISA; or (3) all or  a  part  of  such
funds  constitute assets of one or more separate accounts,  trusts  or  a
commingled pension trust maintained by you, and you have disclosed to the
Company  the  names of such employee benefit plans whose assets  in  such
separate  account or accounts or pension trusts exceed 10% of  the  total
assets  or are expected to exceed 10% of the total assets of such account
or accounts or trusts as of the date of such purchase and the Company has
advised  you in writing (and in making the representations set  forth  in
this clause (3) you are relying on such advice) that the Company is not a
party-in-interest nor are the Notes employer securities with  respect  to
the  particular employee benefit plan disclosed to the Company by you  as
aforesaid (for the purpose of this clause (3), all employee benefit plans
maintained by the same employer or employee organization are deemed to be
a  single  plan).  As used in this 3.2(b), the terms "separate  account",
"party-in-interest",  "employer securities" and "employee  benefit  plan"
shall have the respective meanings assigned to them in ERISA.


Section4.Closing Conditions.

Section4.1.Conditions.   Your obligation to purchase  the  Notes  on  the
Closing  Date shall be subject to the performance by the Company  of  its
agreements hereunder which by the terms hereof are to be performed at  or
prior  to the time of delivery of the Notes and to the following  further
conditions precedent:
     
           (a)     Closing  Certificate.   You  shall  have  received   a
     certificate  dated the Closing Date, signed by the  President  or  a
     Vice President of the Company, the truth and accuracy of which shall
     be  a condition to your obligation to purchase the Notes proposed to
     be  sold  to you and to the effect that (1) the representations  and
     warranties of the Company set forth in Exhibit B hereto are true and
     correct on and with respect to the Closing Date, (2) the Company has
     performed all of its obligations hereunder which are to be performed
     on  or  prior  to the Closing Date, and (3) no Default or  Event  of
     Default has occurred and is continuing.
     
          (b)   Legal Opinions.  You shall have received from Chapman and
     Cutler,  who are acting as your special counsel in this transaction,
     and  from  Ropes  & Gray, counsel for the Company, their  respective
     opinions  dated the Closing Date, in form and substance satisfactory
     to  you,  and covering the matters set forth in Exhibits  C  and  D,
     respectively, hereto.
     
          (c)    Company's Existence and Authority.  On or prior  to  the
     Closing  Date,  you  shall  have received,  in  form  and  substance
     reasonably  satisfactory  to  you and  your  special  counsel,  such
     documents  and  evidence  with respect to the  Company  as  you  may
     reasonably  request  in order to establish the  existence  and  good
     standing  of  the Company and the authorization of the  transactions
     contemplated by this Agreement.
     
          (d)    Private  Placement Number.  On or prior to  the  Closing
     Date,  special  counsel to the Purchaser shall have  duly  made  the
     appropriate filings with Standard & Poor's CUSIP Service Bureau,  as
     agent  for  the National Association of Insurance Commissioners,  in
     order to obtain a private placement number for the Notes.
     
          (e)   Funding Instructions.  At least three Business Days prior
     to  the  Closing Date, you shall have received written  instructions
     executed  by  a  Responsible Officer of the  Company  directing  the
     manner  of the payment of funds and setting forth (1) the  name  and
     address  of  the  transferee bank, (2) such  transferee  bank's  ABA
     number,  (3)  the  account name and number into which  the  purchase
     price  for  the  Notes  is to be deposited, and  (4)  the  name  and
     telephone  number  of  the  account representative  responsible  for
     verifying receipt of such funds.
     
          (f)   Special Counsel Fees.  Concurrently with the delivery  of
     the  Notes to you on the Closing Date, the charges and disbursements
     of Chapman and Cutler, your special counsel, shall have been paid by
     the Company.
     
          (g)   Legality of Investment.  The Notes to be purchased by you
     shall  be  a  legal  investment for  you  under  the  laws  of  each
     jurisdiction to which you may be subject (without resort to any  so-
     called "basket provisions" to such laws).
     
          (h)    Satisfactory  Proceedings.   All  proceedings  taken  in
     connection with the transactions contemplated by this Agreement, and
     all  documents  necessary  to  the consummation  thereof,  shall  be
     satisfactory in form and substance to you and your special  counsel,
     and you shall have received a copy (executed or certified as may  be
     appropriate)  of  all  legal  documents  or  proceedings  taken   in
     connection with the consummation of said transactions.

Section4.2.Waiver  of  Conditions.  If on the Closing  Date  the  Company
fails  to tender to you the Notes to be issued to you on such date or  if
the  conditions  specified  in  4.1 have  not  been  fulfilled,  you  may
thereupon  elect  to  be relieved of all further obligations  under  this
Agreement.   Without limiting the foregoing, if the conditions  specified
in  4.1  have not been fulfilled, you may waive compliance by the Company
with any such condition to such extent as you may in your sole discretion
determine.   Nothing in this 4.2 shall operate to relieve the Company  of
any  of  its obligations hereunder or to waive any of your rights against
the Company.


Section5.Company Covenants.
     
     From and after the Closing Date and continuing so long as any amount
remains unpaid on any Note:

Section5.1.Corporate Existence, Etc.  The Company will preserve and  keep
in  full force and effect, and will cause each Subsidiary to preserve and
keep  in  full force and effect, its corporate existence and all licenses
and  permits  necessary to the proper conduct of its  business,  provided
that the foregoing shall not prevent any transaction permitted by 5.13.

Section5.2.Insurance.  The Company will maintain,  and  will  cause  each
Subsidiary  to  maintain,  insurance coverage by  financially  sound  and
reputable   insurers   and  of  the  character  usually   maintained   by
corporations of established reputation engaged in the same or  a  similar
business  and owning and operating similar properties and in  such  forms
and  amounts  and  against  such risks as a Responsible  Officer  of  the
Company  or  the  relevant  Subsidiary  shall  have  determined  in  such
officer's reasonable opinion to be necessary or advisable in the  conduct
of the Company's or such Subsidiary's business, as the case may be.

Section5.3.Taxes, Claims for Labor and Materials; Compliance  with  Laws.
(a)  The  Company  will promptly pay and discharge, and will  cause  each
Subsidiary  promptly to pay and discharge, all lawful taxes,  assessments
and  governmental  charges or levies imposed upon  the  Company  or  such
Subsidiary, respectively, or upon or in respect of all or any part of the
property  or  business  of  the Company or  such  Subsidiary,  all  trade
accounts  payable in accordance with usual and customary business  terms,
and all claims for work, labor or materials, which if unpaid might become
a  Lien upon any property of the Company or such Subsidiary; provided the
Company  or  such Subsidiary shall not be required to pay any  such  tax,
assessment,  charge, levy, account payable or claim if (1) the  validity,
applicability  or  amount thereof is being contested  in  good  faith  by
appropriate actions or proceedings so long as such actions or proceedings
will  prevent  the forfeiture or sale of any property of the  Company  or
such Subsidiary or any material interference with the use thereof by  the
Company  or such Subsidiary during the pendency of such proceedings,  and
(2) the Company or such Subsidiary shall set aside on its books, adequate
reserves to the extent required in accordance with GAAP.

    (b)   The Company will promptly comply and will cause each Subsidiary
to  promptly comply with all laws, ordinances or governmental  rules  and
regulations  to  which it is subject, including, without limitation,  the
Occupational  Safety and Health Act of 1970, as amended,  ERISA  and  all
Environmental Laws, the violation of which could reasonably  be  expected
to  materially and adversely affect the properties, business,  prospects,
profits  or  condition (financial or otherwise) of the  Company  and  its
Subsidiaries  taken as a whole or would result in any Lien not  permitted
under  5.10, except where the necessity of compliance therewith is  being
contested in good faith by appropriate actions or proceedings,  but  only
so  long  as  the  continued  violation of any  such  law,  ordinance  or
governmental  rule  or regulation would not subject the  Company  or  any
Subsidiary to further penalties.

Section5.4.Maintenance,  Etc.  The Company will  maintain,  preserve  and
keep, and will cause each Subsidiary to maintain, preserve and keep,  its
properties  which  are  used or useful in the  conduct  of  its  business
(whether owned in fee or a leasehold interest) in good repair and working
order.

Section5.5.Nature  of Business.  Neither the Company nor  any  Subsidiary
will  engage in any business if, as a result, the general nature  of  the
business,  taken on a consolidated basis, which would then be engaged  in
by  the Company and its Subsidiaries would be substantially changed  from
the  general  nature of the business engaged in by the  Company  and  its
Subsidiaries on the date of this Agreement.

Section5.6.Consolidated  Tangible Net Worth.  The  Company  will  at  all
times keep and maintain Consolidated Tangible Net Worth at an amount  not
less  than  (a)  $100,000,000  plus (b) 50% of  Consolidated  Net  Income
computed  on  a cumulative basis for each of the elapsed fiscal  quarters
ending   after  March  31,  1995;  provided  that  notwithstanding   that
Consolidated  Net  Income for any such elapsed fiscal quarter  may  be  a
deficit figure, no reduction as a result thereof shall be made in the sum
to be maintained pursuant hereto.

Section5.7.Consolidated Funded Debt Maintenance Ratio.  The Company  will
not  at  any time permit the ratio of Consolidated Funded Debt (excluding
Non-Recourse  ORBIMAGE  Debt)  to Consolidated  Total  Capitalization  to
exceed:
                                                         
                                              Ratio of Consolidated
                                                  Funded Debt to
                During the Period               Consolidated Total
                                                  Capitalization
                                                         
              Closing Date through                 .45 to 1.00
                 December 30, 1995
                                                         
              December 31, 1995 and                .40 to 1.00
                     thereafter

Section5.8.Fixed Charges Coverage Ratio.  The Company will at  all  times
keep and maintain the Fixed Charges Coverage Ratio at not less than:
                                                    
                During the Period         Minimum Ratio Level
                                                    
          Closing Date through                1.25 to 1.00
             March 31, 1996
                                                    
          April 1, 1996 and                   1.50 to 1.00
             thereafter

Section5.9.Priority Funded Debt Ratio.  The Company will not at any  time
permit  the  ratio of Consolidated Priority Funded Debt  to  Consolidated
Tangible Net Worth to exceed:
                                                    
                                             Percentage of
                During the Period        Consolidated Tangible
                                               Net Worth
                                                    
          Closing Date through                      
          December 30, 1995                   .40 to 1.00
                                                    
          December 31, 1995 through                 
          December 30, 1996                   .30 to 1.00
                                                    
          December 31, 1996 and                     
          thereafter                          .20 to 1.00

Section5.10.Limitation  on Liens.  The Company will  not,  and  will  not
permit any Subsidiary to, create or incur, or suffer to be incurred or to
exist, any Lien on its or their property or assets, whether now owned  or
hereafter acquired, or upon any income or profits therefrom, or  transfer
any  property  for the purpose of subjecting the same to the  payment  of
obligations in priority to the payment of its or their general creditors,
or  acquire or agree to acquire, or permit any Subsidiary to acquire, any
property  or  assets  upon conditional sales agreements  or  other  title
retention devices, except:
     
          (a)    Liens for property taxes and assessments or governmental
     charges  or levies and Liens securing claims or demands of mechanics
     and  materialmen, provided that payment thereof is not at  the  time
     required by 5.3;
     
         (b)   Liens of or resulting from any judgment or award, the time
     for  the  appeal or petition for rehearing of which shall  not  have
     expired, or in respect of which the Company or a Subsidiary shall at
     any time in good faith be prosecuting an appeal or proceeding for  a
     review, in respect of which a stay of execution pending such  appeal
     or  proceeding for review shall have been secured, and for which the
     Company  or  the  relevant Subsidiary shall have set  aside  on  its
     books,  adequate reserves to the extent required in accordance  with
     GAAP;
     
          (c)    Liens  incidental  to the conduct  of  business  or  the
     ownership  of  properties and assets (including Liens in  connection
     with  worker's compensation, unemployment insurance and  other  like
     laws,  warehousemen's and attorneys' liens and statutory  landlords'
     liens) and Liens to secure the performance of bids, tenders or trade
     contracts,  or  to  secure statutory obligations, surety  or  appeal
     bonds  or  other  Liens of like general nature,  in  any  such  case
     incurred  in  the ordinary course of business and not in  connection
     with  the  borrowing of money, provided in each case, the obligation
     secured  is not overdue or, if overdue, is being contested  in  good
     faith by appropriate actions or proceedings;
     
           (d)     survey   exceptions  or  encumbrances,  easements   or
     reservations,  or rights of others for rights-of-way, utilities  and
     other  similar purposes, or zoning or other restrictions as  to  the
     use  of real properties, which are necessary for the conduct of  the
     activities  of the Company and its Subsidiaries or which customarily
     exist on properties of corporations used in a manner consistent with
     the  current and intended used by the Company of its properties  and
     which  do  not  in  any event materially impair  their  use  in  the
     operation of the business of the Company and its Subsidiaries;
     
          (e)    Liens consisting of stockholder agreements, voting trust
     agreements,  buy-back  agreements and similar  arrangements  entered
     into  by  the  Company  or  any Subsidiary in  connection  with  its
     investment  or participation in joint ventures, provided  that  such
     agreements  or arrangements are made solely with other  participants
     in  the  subject  joint venture and the Liens  resulting  from  such
     agreements or arrangements shall relate solely to voting of  venture
     interests, control over venture property and dispositions of venture
     participations or interests;
     
          (f)    Liens  securing  Indebtedness  of  the  Company  or  any
     Subsidiary  maturing  within one year  from  the  date  of  issuance
     thereof, provided that (1) such Liens are released promptly upon the
     maturity of such Indebtedness, (2) all Indebtedness secured by  such
     Liens  is outstanding pursuant to a single credit facility, may  not
     be  renewed,  extended,  refunded or replaced  by  other  short-term
     Indebtedness  secured by any Lien for a period of 30 days  following
     the maturity, expiration or termination thereof, and (4) at the time
     of  any  renewal, extension, refunding or replacement of such short-
     term  Indebtedness,  whether with other short-term  Indebtedness  or
     Funded Debt, no Default or Event of Default would exist;
     
         (g)   Liens securing Indebtedness of a Subsidiary to the Company
     or to another Wholly-owned Subsidiary; and
     
          (h)    Liens  existing as of the Closing Date and described  on
     Schedule II hereto, and Liens created, issued or incurred after  the
     Closing  Date  given to secure Indebtedness of the  Company  or  any
     Subsidiary  maintained  within  the limitations  set  forth  in  5.9
     hereof,  provided that at the time such Lien is created,  issued  or
     incurred  no  Default or Event of Default under 6.1(a) through  (d),
     (f)  or  (g)  (arising,  in the case of 6.1(d),  by  reason  of  the
     failure  of the Company to observe or perform any covenant contained
     in 5.6 through 5.9) shall have occurred and be continuing.

Section5.11.Restricted Investments.  (a) Neither the Company nor  any  of
its   Subsidiaries  will  declare,  make  or  authorize  any   Restricted
Investment,  unless,  immediately after giving  effect  to  the  proposed
Restricted  Investment,  the aggregate amount of  Restricted  Investments
then  held by the Company and its Subsidiaries (valued immediately  after
the  making  of such Restricted Investment as provided in the  definition
thereof)  would not exceed 50% of an amount equal to the  excess  of  (1)
actual  Consolidated Tangible Net Worth at the time the  Company  or  any
Subsidiary  proposes  to make any such Restricted  Investment,  over  (2)
minimum Consolidated Tangible Net Worth then required by 5.6.

     (b)   For the purposes of making computations under paragraph (a) of
this  5.11,  (1) the amount of any Restricted Investment to  be  made  in
property or assets of the Company or a Subsidiary shall be deemed  to  be
the greater of the book value or fair market value (as determined in good
faith by the Company's Board of Directors) of such property or assets  as
of  the date the Investment is committed to and (2) the value of existing
Restricted  Investments  shall be taken at  the  original  cost  thereof,
without  allowance  for  any  subsequent write-offs  or  appreciation  or
depreciation therein, but less any amount repaid or recovered in cash  on
account of capital or principal.
     
     Any  entity  which  becomes a Subsidiary  after  the  date  of  this
Agreement  shall  be deemed to have made, on the 90th day  following  the
date  on which it became a Subsidiary, all Restricted Investments of such
corporation existing on such 90th day after it becomes a Subsidiary.

    (c)   Neither the Company nor any Subsidiary will make any Restricted
Investment if after giving effect to the proposed Restricted Investment a
Default or an Event of Default would exist.

Section5.12.Restricted  Payments.  (a) The Company  will  not  except  as
hereinafter provided:
     
          (1)   Declare or pay any dividends, either in cash or property,
     on any shares of its capital stock of any class (except dividends or
     other distributions payable solely in shares of common stock of  the
     Company);
     
          (2)    Directly  or  indirectly, or through any  Subsidiary  or
     through any Affiliate of the Company, purchase, redeem or retire any
     shares of its capital stock of any class or any warrants, rights  or
     options  to  purchase  or acquire any shares of  its  capital  stock
     (other  than in exchange for or out of the net cash proceeds to  the
     Company from the substantially concurrent issue or sale of shares of
     common  stock  of  the  Company or warrants, rights  or  options  to
     purchase or acquire any shares of its common stock); or
     
         (3)   Make any other payment or distribution, either directly or
     indirectly  or  through any Subsidiary, in respect  of  its  capital
     stock;

(such  declarations or payments of dividends, purchases,  redemptions  or
retirements of capital stock and warrants, rights or options and all such
other   payments  or  distributions  being  herein  collectively   called
"Restricted  Payments"),  if after giving effect  thereto  the  aggregate
amount  of Restricted Payments made during the period from and after  the
Closing  Date  to and including the date of the making of the  Restricted
Payment  in  question  would exceed the sum of (i) during  any  quarterly
fiscal period in which the Fixed Charges Coverage Ratio is less than 2.25
to  1.00,  25%  of  Consolidated Net Income (or if such Consolidated  Net
Income  is  a deficit figure, then minus 100% of such deficit)  for  such
quarterly fiscal period, plus (ii) during any quarterly fiscal period  in
which  the Fixed Charges Coverage Ratio is equal to or more than 2.25  to
1.00,  50% of Consolidated Net Income (or if such Consolidated Net Income
is  a deficit figure, then minus 100% of such deficit) for such quarterly
fiscal period, computed on a cumulative basis for the entire period  from
the  Closing  Date  to  and  including the date  of  the  making  of  the
Restricted Payment in question.

     (b)   The Company will not declare any dividend which constitutes  a
Restricted  Payment  payable  more  than  60  days  after  the  date   of
declaration thereof.

     (c)    For  the purposes of this 5.12, the amount of any  Restricted
Payment declared, paid or distributed in property shall be deemed  to  be
the greater of the book value or fair market value (as determined in good
faith  by the Board of Directors of the Company) of such property at  the
time of the making of the Restricted Payment in question.

     (d)   The Company will not authorize or make a Restricted Payment if
after giving effect to the proposed Restricted Payment a Default or Event
of Default would exist.

Section5.13.Mergers, Consolidations and Sales of Assets.  (a) The Company
will not, and will not permit any Subsidiary to, consolidate with or be a
party  to  a  merger with any other Person, or sell, lease  or  otherwise
dispose  of  all or substantially all of its assets (except any  sale  or
disposition of all or substantially all of the assets, or any stock  sale
or   disposition,   pursuant  to  5.13(b)  and  5.13(c),   respectively);
provided that:
     
          (1)   any Subsidiary may merge or consolidate with or into  the
     Company  or any Wholly-owned Subsidiary so long as in any merger  or
     consolidation  involving  the Company,  the  Company  shall  be  the
     surviving or continuing corporation;
     
          (2)   any Subsidiary may merge or consolidate with or into  any
     other  corporation so long as such Subsidiary shall be the surviving
     or  continuing corporation and the Company's percentage ownership of
     such  surviving  or  continuing corporation shall  be  equal  to  or
     greater  than the Company's percentage ownership of such  Subsidiary
     immediately prior to such merger or consolidation;
     
         (3)   any Wholly-owned Subsidiary which is formed by the Company
     or  any  other Subsidiary for the purpose of acquiring  all  of  the
     outstanding capital stock of another corporation may merge with such
     corporation;
     
          (4)    the  Company may consolidate or merge with or  into  any
     other   corporation  or  partnership  if  (i)  the  corporation   or
     partnership  which results from such consolidation  or  merger  (the
     "surviving entity") is organized under the laws of any state of  the
     United  States, the District of Columbia or under the laws of Canada
     or  any  Province thereof, (ii) the due and punctual payment of  the
     principal of and premium, if any, and interest on all of the  Notes,
     according  to their tenor, and the due and punctual performance  and
     observation of all of the covenants in the Notes and this  Agreement
     to  be performed or observed by the Company are expressly assumed in
     writing  by  the  surviving entity and the  surviving  entity  shall
     furnish to the holders of the Notes an opinion of counsel reasonably
     satisfactory  to such holders to the effect that the  instrument  of
     assumption  has  been duly authorized, executed  and  delivered  and
     constitutes  the legal, valid and binding contract and agreement  of
     the  surviving  entity  enforceable in accordance  with  its  terms,
     except  as  enforcement of such terms may be limited by  bankruptcy,
     insolvency,  reorganization, moratorium and similar  laws  affecting
     the  enforcement  of  creditors' rights  generally  and  by  general
     equitable principles, and (iii) at the time of such consolidation or
     merger  and  immediately after giving effect thereto, no Default  or
     Event  of Default would exist; provided that if the surviving entity
     is  a  partnership or a Canadian corporation, the Company will enter
     into  such  amendments to this Agreement and the  Notes  as  may  be
     required by the holders of the Notes in order to provide the holders
     of  the  Notes  with the practical benefits of this Agreement  after
     giving effect to such consolidation or merger and otherwise in  form
     and substance satisfactory to the holders of at least 66-2/3% of the
     principal amount of the Notes at the time outstanding;
     
          (5)    the  Company  may sell or otherwise dispose  of  all  or
     substantially  all  of  its assets to any Person  for  consideration
     which represents the fair market value of such assets (as determined
     in  good faith by the Board of Directors of the Company) at the time
     of  such sale or other disposition if (i) the acquiring Person is  a
     corporation or partnership organized under the laws of any state  of
     the  United  States, the District of Columbia or under the  laws  of
     Canada or any Province thereof, (ii) the due and punctual payment of
     the principal of and premium, if any, and interest on all the Notes,
     according  to their tenor, and the due and punctual performance  and
     observance  of  all  of  the covenants in  the  Notes  and  in  this
     Agreement  to be performed or observed by the Company are  expressly
     assumed in writing by the acquiring Person and the acquiring  Person
     shall  furnish  to  the holders of the Notes an opinion  of  counsel
     reasonably  satisfactory to such holders  to  the  effect  that  the
     instrument  of  assumption  has been duly authorized,  executed  and
     delivered and constitutes the legal, valid and binding contract  and
     agreement  of  such acquiring corporation enforceable in  accordance
     with  its terms, except as enforcement of such terms may be  limited
     by  bankruptcy, insolvency, reorganization, moratorium  and  similar
     laws affecting the enforcement of creditors' rights generally and by
     general equitable principles, and (iii) at the time of such sale  or
     disposition and immediately after giving effect thereto, no  Default
     or  Event  of  Default would exist; provided that if  the  acquiring
     Person is a partnership or a Canadian corporation, the Company  will
     enter into such amendments to this Agreement and the Notes as may be
     required by the holders of the Notes in order provide the holders of
     the Notes with the practical benefits of this Agreement after giving
     effect  to  such consolidation or merger and otherwise in  form  and
     substance  satisfactory to the holders of at least  66-2/3%  of  the
     principal amount of the Notes at the time outstanding;

     (b)    The Company will not, and will not permit any Subsidiary  to,
sell, lease, transfer, abandon or otherwise dispose of assets (except  in
the  ordinary  course  of business for fair market value  and  except  as
provided in 5.11 (including the disposal of Restricted Investments  of  a
Subsidiary  within  90  days  after it becomes  a  Subsidiary),  5.12  or
5.13(a)(5)); provided that the foregoing restrictions do not apply to:
     
          (1)    the sale, lease, transfer or other disposition of assets
     of  the  Company  or a Subsidiary to the Company or  a  Wholly-owned
     Subsidiary; or
     
          (2)   the sale of assets for cash or other property to a Person
     or  Persons  other  than  an  Affiliate  if  all  of  the  following
     conditions are met:
          
               (i)    such  assets  (valued at net book  value)  do  not,
          together  with  all  other  assets  of  the  Company  and   its
          Subsidiaries  previously  disposed of  during  the  immediately
          preceding 12 calendar months (other than in the ordinary course
          of  business), exceed 10% of Consolidated Tangible Assets,  and
          such  assets  (valued at net book value) do not, together  with
          all other assets of the Company and its Subsidiaries previously
          disposed  of during the period from the date of this  Agreement
          to  and  including the date of the sale of such  assets  (other
          than  in  the  ordinary  course of  business),  exceed  20%  of
          Consolidated  Tangible Assets, in each such case determined  as
          of the end of the immediately preceding fiscal year;
          
              (ii)    in the opinion of the Company's Board of Directors,
          the  sale is for fair value and is in the best interests of the
          Company; and
          
            (iii)   immediately after the consummation of the transaction
          and after giving effect thereto, no Default or Event of Default
          would exist;
     
     provided,  however, that for purposes of the foregoing  calculation,
     there  shall not be included that portion of the proceeds  from  the
     disposition  of  any  assets  which were  or  are  (y)  invested  in
     Investments of the character described in clauses (e), (f), (g), (h)
     or  (i)  of  the definition of Restricted Investments  contained  in
     8.1,  and (z) applied within 12 months of the date of sale  of  such
     assets  to either (A) the acquisition of assets (including stock  of
     an  entity  which  subsequently becomes  a  Subsidiary)  useful  and
     intended to be used in the operation of the business of the  Company
     and  its  Subsidiaries as described in 5.5 (including any Investment
     permitted by 5.11) and having a fair market value (as determined  in
     good  faith  (1)  by  a  Responsible Officer  in  the  case  of  any
     acquisition  of assets having a fair market value of  $1,500,000  or
     less,  and (2) by the Board of Directors of the Company in the  case
     of any acquisition of assets having a fair market value greater than
     $1,500,000)  at  least equal to the net proceeds of  the  assets  so
     disposed  of  or  (B)  the prepayment at any  applicable  prepayment
     premium,  on  a pro rata basis, of the Notes.  It is understood  and
     agreed by the Company that any such proceeds paid and applied to the
     prepayment of the Notes as hereinabove provided shall be prepaid  as
     and to the extent provided in 2.2.
     
     Computations  pursuant  to this 5.13(b) shall  include  dispositions
made  pursuant  to  5.13(c) and computations pursuant  to  5.13(c)  shall
include dispositions made pursuant to this 5.13(b).

     (c)    The Company will not, and will not permit any Subsidiary  to,
sell,  pledge or otherwise dispose of any shares of the stock  (including
as  "stock"  for the purposes of this 5.13(c) any options or warrants  to
purchase  stock or other Securities exchangeable for or convertible  into
stock)  of  a  Subsidiary  (said  stock,  options,  warrants  and   other
Securities herein called "Subsidiary Stock") or any Indebtedness  of  any
Subsidiary,  nor  will any Subsidiary issue, sell,  pledge  or  otherwise
dispose  of  any  shares of its own Subsidiary Stock, provided  that  the
foregoing restrictions do not apply to:
     
         (1)   the issue of directors' qualifying shares; or
     
         (2)   the issue of Subsidiary Stock to the Company; or
     
          (3)    the  issue or grant of any right, option or  warrant  to
     purchase   capital  stock  of  a  Subsidiary  or  other   Securities
     exchangeable  for  or  convertible  into  capital  stock   of   such
     Subsidiary to any employee or employees of such Subsidiary, provided
     that  after giving effect to the exercise of such right,  option  or
     warrant  or  other  convertible Security, such  holders  of  rights,
     options  or warrants do not hold in the aggregate more than  10%  of
     the outstanding capital stock of such Subsidiary; or
     
          (4)    the  sale  or other disposition of shares  of  stock  of
     ORBCOMM, provided that if, after giving effect to any such  sale  or
     other  disposition, the Company owns less than  20%  of  the  Voting
     Stock  of  ORBCOMM, then all proceeds from the sale  of  such  stock
     shall be applied in the manner required by the proviso to clause (4)
     of this 5.13(c); or
     
          (5)   the sale or other disposition at any one time to a Person
     (other  than directly or indirectly to an Affiliate) of all  or  any
     part of the Investment of the Company and its other Subsidiaries  in
     any Subsidiary if all of the following conditions are met:
          
               (i)    the  assets  (valued at net  book  value)  of  such
          Subsidiary to be so disposed of do not, together with all other
          assets  of the Company and its Subsidiaries previously disposed
          of  during the immediately preceding 12 calendar months  (other
          than  in  the  ordinary  course of  business),  exceed  10%  of
          Consolidated  Tangible Assets, and such assets (valued  at  net
          book  value) of such Subsidiary do not, together with all other
          assets  of the Company and its Subsidiaries previously disposed
          of  during  the period from the date of this Agreement  to  and
          including  the date of the sale of such assets (other  than  in
          the  ordinary  course of business), exceed 20% of  Consolidated
          Tangible Assets, in each such case determined as of the end  of
          the immediately preceding fiscal year;
          
              (ii)   in the case of the sale or other disposition of less
          than  all  of  the  Investment of the  Company  and  its  other
          Subsidiaries  in such Subsidiary, after giving effect  thereto,
          the Company and its other Subsidiaries will own and control not
          less  than 51% of the Voting Stock of the Subsidiary  of  which
          such part has been so sold or otherwise disposed of;
          
             (iii)    in the opinion of the Company's Board of Directors,
          the  sale is for fair value and is in the best interests of the
          Company; and
          
             (iv)   immediately after the consummation of the transaction
          and after giving effect thereto, no Default or Event of Default
          would exist;
     
     provided,  however, that for purposes of the foregoing  calculation,
     there  shall not be included that portion of the proceeds  from  the
     disposition  of  any  assets  which were  or  are  (y)  invested  in
     Investments of the character described in clauses (e), (f), (g), (h)
     or  (i)  of  the definition of Restricted Investments  contained  in
     8.1,  and (z) applied within 12 months of the date of sale  of  such
     assets  to either (A) the acquisition of assets (including stock  of
     an  entity  which  subsequently becomes  a  Subsidiary)  useful  and
     intended to be used in the operation of the business of the  Company
     and  its  Subsidiaries as described in 5.5 (including any Investment
     permitted by 5.11) and having a fair market value (as determined  in
     good  faith   (1)  by  a Responsible Officer  in  the  case  of  any
     acquisition  of assets having a fair market value of  $1,500,000  or
     less,  and (2) by the Board of Directors of the Company in the  case
     of any acquisition of assets having a fair market value greater than
     $1,500,000)  at  least equal to the net proceeds of  the  assets  so
     disposed  of  or  (B)  the prepayment at any  applicable  prepayment
     premium,  on  a pro rata basis, of the Notes.  It is understood  and
     agreed by the Company that any such proceeds paid and applied to the
     prepayment of the Notes as hereinabove provided shall be prepaid  as
     and to the extent provided 2.2.
     
     Computations  pursuant  to this 5.13(c) shall  include  dispositions
made  pursuant  to  5.13(b) and computations pursuant  to  5.13(b)  shall
include dispositions made pursuant to this 5.13(c).

Section5.14.Repurchase  of Notes.  Except as  provided  in  2.2  or  2.3,
neither  the  Company  nor  any  Subsidiary  or  Affiliate,  directly  or
indirectly, may repurchase or make any offer to repurchase any Notes.

Section5.15.Transactions with Affiliates.  The Company will not, and will
not permit any Subsidiary to, enter into or be a party to any transaction
or  arrangement  with any Affiliate (including, without  limitation,  the
purchase from, sale to or exchange of property with, or the rendering  of
any  service by or for, any Affiliate), except in the ordinary course  of
and  pursuant  to  the reasonable requirements of the Company's  or  such
Subsidiary's  business  and  upon  fair  and  reasonable  terms  no  less
favorable  to  the  Company or such Subsidiary than  would  obtain  in  a
comparable  arm's-length  transaction  with  a  Person  other   than   an
Affiliate.

Section5.16.Termination of Pension Plans.  The Company will not and  will
not  permit  any  Subsidiary to withdraw from any Multiemployer  Plan  or
permit  any  employee benefit plan maintained by it to be  terminated  if
such withdrawal or termination could reasonably be expected to result  in
withdrawal liability (as described in Part 1 of Subtitle E of Title IV of
ERISA) or the imposition of a Lien on any property of the Company or  any
Subsidiary pursuant to Section 4068 of ERISA.

Section5.17.Reports and Rights of Inspection.  The Company will keep, and
will cause each Subsidiary to keep, proper books of record and account in
which  full  and  correct  entries  will  be  made  of  all  dealings  or
transactions  of,  or in relation to, the business  and  affairs  of  the
Company  or such Subsidiary, in accordance with GAAP consistently applied
(except  for  changes disclosed in the financial statements furnished  to
you  pursuant  to  this 5.17 and concurred in by the  independent  public
accountants referred to in 5.17(b)), and will furnish to you so  long  as
you are the holder of any Note and to each other Institutional Holder  of
the  then  outstanding  Notes (in duplicate  if  so  specified  below  or
otherwise requested):
     
          (a)    Quarterly Statements.  As soon as available and  in  any
     event  within 60 days after the end of each quarterly fiscal  period
     (except the last) of each fiscal year, copies of:
          
               (1)   a consolidated balance sheet of the Company and  its
          Subsidiaries  as of the close of such quarterly fiscal  period,
          setting forth in comparative form the consolidated figures  for
          the fiscal year then most recently ended,
          
              (2)   consolidated statements of earnings and operations of
          the  Company  and  its Subsidiaries for such  quarterly  fiscal
          period and for the portion of the fiscal year ending at the end
          of  such  quarterly fiscal period, setting forth in comparative
          form the consolidated figures for the corresponding periods  of
          the preceding fiscal year, and
          
              (3)   a consolidated statement of cash flows of the Company
          and  its Subsidiaries for the portion of the fiscal year ending
          at  the  end of such quarterly fiscal period, setting forth  in
          comparative form the consolidated figures for the corresponding
          period of the preceding fiscal year,
     
     all  in  reasonable  detail and certified as  complete  and  correct
     (subject to year-end adjustments) by an authorized financial officer
     of the Company;
     
          (b)   Annual Statements.  As soon as available and in any event
     within  90 days after the close of each fiscal year of the  Company,
     copies of:
          
               (1)   a consolidated balance sheet of the Company and  its
          Subsidiaries as of the close of such fiscal year, and
          
               (2)    consolidated statements of earnings,  stockholders'
          equity  and cash flows of the Company and its Subsidiaries  for
          such fiscal year,
     
     in  each  case  setting forth in comparative form  the  consolidated
     figures for the preceding fiscal year, all in reasonable detail  and
     accompanied  by  a  report thereon of a firm of  independent  public
     accountants of recognized national standing selected by the  Company
     to  the  effect  that the consolidated financial statements  present
     fairly,   in  all  material  respects,  the  consolidated  financial
     position  of the Company and its Subsidiaries as of the end  of  the
     fiscal year being reported on and the consolidated results of  their
     operations and cash flows for said year in conformity with GAAP  and
     that  the  examination of such accountants in connection  with  such
     financial statements has been conducted in accordance with generally
     accepted  auditing  standards  and  included  such  tests   of   the
     accounting  records  and  such  other auditing  procedures  as  said
     accountants believe provide a reasonable basis for their report;
     
         (c)   Audit Reports.  Promptly upon receipt thereof, one copy of
     each interim or special audit made by independent accountants of the
     books  of  the  Company or any Subsidiary and any management  letter
     received from such accountants;
     
          (d)    SEC  and  Other Reports.  Promptly upon  their  becoming
     available, one copy of each financial statement, report,  notice  or
     proxy   statement  sent  by  the  Company  to  its   creditors   and
     stockholders generally and of each regular or periodic  report,  and
     any  definitive registration statement or prospectus  filed  by  the
     Company  or  any  Subsidiary  with any securities  exchange  or  the
     Securities  and  Exchange Commission or any  successor  agency,  and
     copies of any orders in any proceedings to which the Company or  any
     of  its  Subsidiaries is a party, issued by any governmental agency,
     Federal or state, having jurisdiction over the Company or any of its
     Subsidiaries;
     
          (e)    ERISA  Reports.   Promptly upon the occurrence  thereof,
     written  notice of (1) a Reportable Event with respect to  any  Plan
     (in  which  event,  such notice shall be given when  the  Reportable
     Event  is  required to be reported to the PBGC); (2) the institution
     of  any  steps by the Company, any ERISA Affiliate, the PBGC or  any
     other  Person to terminate any Plan pursuant to Sections 4041(c)  or
     4042  of  ERISA; (3) the institution of any steps by the Company  or
     any  ERISA Affiliate to withdraw from any Multiemployer Plan; (4)  a
     non-exempt  "prohibited transaction" within the meaning  of  Section
     406  of  ERISA  in  connection with any Plan (in which  event,  such
     notice  shall be given when either Form 5330 or Form 5500  is  filed
     with  the  Internal  Revenue Service or  the  Department  of  Labor,
     respectively, with respect to such prohibited transaction); (5)  any
     material increase in the contingent liability of the Company or  any
     Subsidiary with respect to any post-retirement welfare liability; or
     (6) the taking of any action by, or the threatening of the taking of
     any action by, the Internal Revenue Service, the Department of Labor
     or the PBGC with respect to any of the foregoing;
     
          (f)    Officer's Certificates.  Within the periods provided  in
     paragraphs  (a) and (b) above, a certificate of the chief  financial
     officer  of  the Company stating that such officer has reviewed  the
     provisions of this Agreement and setting forth:  (1) the information
     and, if applicable, computations (in sufficient detail) required  in
     order  to  establish whether the Company was in compliance with  the
     requirements  of 5.6 through 5.13 at the end of the  period  covered
     by  the  financial statements then being furnished, and (2)  whether
     there  existed  as  of  the  date of such financial  statements  and
     whether,  to the best of such officer's knowledge, there  exists  on
     the date of the certificate or existed at any time during the period
     covered by such financial statements any Default or Event of Default
     and,  if  any  such condition or event exists on  the  date  of  the
     certificate,  specifying the nature and period of existence  thereof
     and  the  action  the Company is taking and proposes  to  take  with
     respect thereto;
     
          (g)   Accountant's Certificates.  Within the period provided in
     paragraph (b) above, a certificate of the accountants who render  an
     opinion with respect to such financial statements, stating that they
     have  reviewed this Agreement and stating further whether, in making
     their  audit, such accountants have become aware of any  Default  or
     Event  of  Default  under any of the terms  or  provisions  of  this
     Agreement  insofar  as any such terms or provisions  pertain  to  or
     involve  accounting  matters  or determinations,  and  if  any  such
     condition or event then exists, specifying the nature and period  of
     existence thereof;
     
          (h)    Requested Information.  With reasonable promptness, such
     other  data  and  information  (other  than  confidential  data   or
     information  of  a  technical or scientific nature  which  does  not
     relate  directly  to  the business, financial condition,  assets  or
     properties of the Company or any Subsidiary or to the ability of the
     Company to perform its obligations hereunder or under the Notes)  as
     you or any such Institutional Holder may reasonably request.

Without  limiting the foregoing, the Company will permit you, so long  as
you are the holder of any Note, and each Institutional Holder of the then
outstanding  Notes  (or such Persons as either you or such  Institutional
Holder may designate), to visit and inspect, under the Company's guidance
and  subject  to  any  restrictions relating  to  access  to  proprietary
information  or  as  may otherwise be imposed by  any  of  the  Company's
contracts with third-parties, any of the properties of the Company or any
Subsidiary, to examine all of their books of account and records, to make
copies  and  extracts therefrom and to discuss their respective  affairs,
finances  and  accounts  with their respective officers,  employees,  and
independent  public  accountants  (and  by  this  provision  the  Company
authorizes said accountants to discuss with you the finances and  affairs
of  the Company and its Subsidiaries), all upon reasonable notice and  at
such  reasonable times and as often as may be reasonably  requested.  Any
visitation  or  inspection shall be at the sole expense of  you  or  such
Institutional  Holder, unless a Default or Event of  Default  shall  have
occurred  and  be continuing or the holder of any Note or  of  any  other
evidence  of  Indebtedness  of the Company or any  Subsidiary  gives  any
written  notice  or  takes any other action with  respect  to  a  claimed
default,  in  which  case,  the  Company  shall  reimburse  you  or  such
Institutional  Holder for the reasonable out-of-pocket  expenses  of  any
such visitation or inspection, provided, however, that any visitation  or
inspection made by you or any other Institutional Holder of the Notes  in
connection  with any claimed Default or Event of Default hereunder  which
the  Company demonstrates does not, in fact, exist, shall be at the  sole
expense of you or such Institutional Holder.
     
     The Purchaser and each other holder of the Notes agrees that it will
keep confidential in accordance with its internal policies and procedures
in  effect from time to time any written information with respect to  the
Company or its Subsidiaries which is furnished pursuant to this Agreement
and which is designated by the Company or its Subsidiaries to such holder
in  writing  as  confidential, provided that you may  disclose  any  such
information  (a) as has become generally available to the  public  (other
than  as a consequence of such holder's actions) or to such holder  on  a
non-confidential  basis  from a source other  than  the  Company  or  its
Subsidiaries  or as was known to such holder on a non-confidential  basis
prior to its disclosure by the Company or its Subsidiaries, (b) as may be
required  or appropriate in any report, statement or testimony  submitted
to  any municipal, state or Federal regulatory body having or claiming to
have  jurisdiction over you or to the National Association  of  Insurance
Commissioners or similar organizations or their successors, (c) as may be
required  or  appropriate in response to any summons or  subpoena  or  in
connection  with  any  litigation, (d) to the  extent  that  such  holder
reasonably believes it appropriate in order to protect its investment  in
the Notes or in order to comply with any law, order, regulation or ruling
applicable  to you, (e) to your officers, trustees, directors, employees,
auditors or counsel or to rating agencies or another holder of the Notes,
(f)  to  Persons which are parties to similar confidentiality agreements,
or  (g) to any prospective transferee which is an Institutional Holder in
connection with any contemplated transfer of any of the Notes by you.


Section6.Events of Default and Remedies Therefor.

Section6.1.Events  of Default.  Any one or more of  the  following  shall
constitute an "Event of Default" as such term is used herein:
     
         (a)   Default shall occur in the payment of interest on any Note
     when  the same shall have become due and such default shall continue
     for more than five Business Days; or
     
          (b)    Default  shall  occur  in the  making  of  any  required
     prepayment on any of the Notes as provided in 2.1; or
     
          (c)   Default shall occur in the making of any other payment of
     the  principal  of  any  Note or premium, if  any,  thereon  at  the
     expressed or any accelerated maturity date or at any date fixed  for
     prepayment; or
     
          (d)    Default shall occur in the observance or performance  of
     any  covenant  or  agreement contained in 5.6 through  5.9  or  5.11
     through 5.13; or
     
          (e)    Default shall occur in the observance or performance  of
     any  other provision of this Agreement which is not remedied  within
     30  days  after  the earlier of (1) the day on which  a  Responsible
     Officer  of the Company first obtains knowledge of such default,  or
     (2)  the day on which written notice thereof is given to the Company
     by the holder of any Note; or
     
          (f)   Default shall be made in the payment when due (whether by
     lapse  of time, by declaration, by call for redemption or otherwise)
     of  the  principal of or interest on any Indebtedness  for  borrowed
     money  (other  than  the  Notes) of the Company  or  any  Subsidiary
     aggregating  in excess of $5,000,000 in principal amount outstanding
     and  such default shall continue beyond the period of grace, if any,
     allowed with respect thereto; or
     
          (g)    Default or the happening of any event shall occur  under
     any  indenture,  agreement  or  other  instrument  under  which  any
     Indebtedness  for  borrowed money (other  than  the  Notes)  of  the
     Company  or  any Subsidiary aggregating in excess of  $5,000,000  in
     principal amount outstanding and such default or event is not waived
     or  cured  within applicable cure periods and shall continue  for  a
     period of time sufficient to permit the acceleration of the maturity
     of  any  Indebtedness  for borrowed money  of  the  Company  or  any
     Subsidiary outstanding thereunder; or
     
         (h)   Any representation or warranty made by the Company herein,
     or  made by the Company in any statement or certificate furnished by
     the  Company in connection with the consummation of the issuance and
     delivery  of the Notes or furnished by the Company pursuant  hereto,
     is  untrue in any material respect as of the date of the issuance or
     making thereof; or
     
          (i)    Final  judgment or judgments for the  payment  of  money
     aggregating  in  excess of $1,000,000 is or are outstanding  against
     the  Company or any Subsidiary or against any property or assets  of
     either  and such judgments have remained unpaid, unvacated, unbonded
     or  unstayed by appeal or otherwise for a period of 60 days from the
     date of its entry; or
     
          (j)   A custodian, liquidator, trustee or receiver is appointed
     for  the  Company  or any Subsidiary or for the major  part  of  the
     property  of either and is not discharged within 90 days after  such
     appointment; or
     
          (k)    The  Company  or  any Subsidiary  becomes  insolvent  or
     bankrupt,  is generally not paying its debts as they become  due  or
     makes an assignment for the benefit of creditors, or the Company  or
     any  Subsidiary  applies for or consents to  the  appointment  of  a
     custodian, liquidator, trustee or receiver for the Company  or  such
     Subsidiary or for the major part of the property of either; or
     
          (l)    Bankruptcy,  reorganization, arrangement  or  insolvency
     proceedings, or other proceedings for relief under any bankruptcy or
     similar law or laws for the relief of debtors, are instituted by  or
     against the Company or any Subsidiary and, if instituted against the
     Company  or  any Subsidiary, are consented to or are  not  dismissed
     within 90 days after such institution.

Section6.2.Notice to Holders.  When any Event of Default described in the
foregoing 6.1 has occurred, or if the holder of any Note or of any  other
evidence  of  Indebtedness for borrowed money of the  Company  gives  any
notice  or takes any other action with respect to a claimed default,  the
Company agrees to give notice within three Business Days of such event to
all holders of the Notes then outstanding.

Section6.3.Acceleration  of  Maturities.   When  any  Event  of   Default
described  in  paragraph  (a), (b) or (c) of  6.1  has  happened  and  is
continuing, any holder of any Note may, by notice in writing sent to  the
Company  in the manner provided in 9.6, declare the entire principal  and
all  interest  accrued on such Note to be, and such Note shall  thereupon
become  forthwith  due  and  payable, without  any  presentment,  demand,
protest  or  other notice of any kind, all of which are hereby  expressly
waived.   When any Event of Default described in paragraphs  (a)  through
(i),  inclusive, of said 6.1 has happened and is continuing,  the  holder
or holders of 66-2/3% or more of the principal amount of the Notes at the
time  outstanding may, by notice in writing to the Company in the  manner
provided  in  9.6, declare the entire principal and all interest  accrued
on  all Notes to be, and all Notes shall thereupon become, forthwith  due
and payable, without any presentment, demand, protest or other notice  of
any  kind, all of which are hereby expressly waived.  When any  Event  of
Default described in paragraph (j), (k) or (l) of 6.1 has occurred,  then
all  outstanding  Notes shall immediately become due and payable  without
presentment,  demand or notice of any kind.  Upon the Notes becoming  due
and payable as a result of any Event of Default as aforesaid, the Company
will  forthwith  pay to the holders of the Notes so due and  payable  the
entire  principal and interest accrued on such Notes and, to  the  extent
not prohibited by applicable law, an amount as liquidated damages for the
loss of the bargain evidenced hereby (and not as a penalty) equal to  the
Make-Whole Amount, determined as of the date on which the Notes shall  so
become  due and payable.  No course of dealing on the part of the  holder
or  holders  of  any Notes nor any delay or failure on the  part  of  any
holder  of Notes to exercise any right shall operate as a waiver of  such
right  or  otherwise prejudice such holder's rights, powers and remedies.
The Company further agrees, to the extent permitted by law, to pay to the
holder or holders of the Notes all costs and expenses incurred by them in
the  collection  of  any  Notes upon any default  hereunder  or  thereon,
including  reasonable compensation to such holder's or holders' attorneys
for all services rendered in connection therewith.

Section6.4.Rescission  of  Acceleration.   The  provisions  of  6.3   are
subject to the condition that if the principal of and accrued interest on
all  or  any  outstanding Notes have been declared  immediately  due  and
payable by reason of the occurrence of any Event of Default described  in
paragraphs (a) through (i), inclusive, of 6.1, the holders of 66-2/3%  in
aggregate principal amount of the Notes then outstanding may, by  written
instrument filed with the Company, rescind and annul such declaration and
the  consequences thereof, provided that at the time such declaration  is
annulled and rescinded:
     
          (a)   no judgment or decree has been entered for the payment of
     any monies due pursuant to the Notes or this Agreement;
     
          (b)    all arrears of interest upon all the Notes and all other
     sums  payable under the Notes and under this Agreement  (except  any
     principal, interest or premium on the Notes which has become due and
     payable  solely by reason of such declaration under 6.3) shall  have
     been duly paid; and
     
          (c)    each and every other Default and Event of Default  shall
     have been made good, cured or waived pursuant to 7.1;

and  provided further, that no such rescission and annulment shall extend
to  or  affect any subsequent Default or Event of Default or  impair  any
right consequent thereto.


Section7.Amendments, Waivers and Consents.

Section7.1.Consent Required.  Any term, covenant, agreement or  condition
of  this  Agreement may, with the consent of the Company, be  amended  or
compliance  therewith may be waived (either generally or in a  particular
instance and either retroactively or prospectively), if the Company shall
have  obtained the consent in writing of the holders of at least  66-2/3%
in aggregate principal amount of outstanding Notes; provided that without
the  written consent of the holders of all of the Notes then outstanding,
no  such amendment or waiver shall be effective (a) which will change the
time  of  payment  (including any prepayment  required  by  2.1)  of  the
principal  of or the interest on any Note or change the principal  amount
thereof or change the rate of interest thereon, or (b) which will  change
any  of the provisions with respect to optional prepayments, or (c) which
will change the percentage of holders of the Notes required to consent to
any such amendment or waiver of any of the provisions of this 7 or 6.

Section7.2.Solicitation  of Holders.  So long  as  there  are  any  Notes
outstanding,  the Company will not solicit, request or negotiate  for  or
with respect to any proposed waiver or amendment of any of the provisions
of  this Agreement or the Notes unless each holder of Notes (irrespective
of the amount of Notes then owned by it) shall be informed thereof by the
Company and shall be afforded the opportunity of considering the same and
shall be supplied by the Company with sufficient information to enable it
to make an informed decision with respect thereto.  The Company will not,
directly or indirectly, pay or cause to be paid any remuneration, whether
by  way of supplemental or additional interest, fee or otherwise, to  any
holder of Notes as consideration for or as an inducement to entering into
by any holder of Notes of any waiver or amendment of any of the terms and
provisions  of  this Agreement or the Notes unless such  remuneration  is
concurrently  offered, on the same terms, ratably to the holders  of  all
Notes then outstanding.  Promptly and in any event within 30 days of  the
date  of  execution  and delivery of any such waiver  or  amendment,  the
Company  shall provide a true, correct and complete copy thereof to  each
of the holders of the Notes.

Section7.3.Effect of Amendment or Waiver.  Any such amendment  or  waiver
shall  apply  equally to all of the holders of the  Notes  and  shall  be
binding  upon  them, upon each future holder of any  Note  and  upon  the
Company, whether or not such Note shall have been marked to indicate such
amendment  or  waiver.  No such amendment or waiver shall  extend  to  or
affect any obligation not expressly amended or waived or impair any right
consequent thereon.


Section8.Interpretation of Agreement; Definitions.

Section8.1.Definitions.  Unless the context otherwise requires, the terms
hereinafter set forth when used herein shall have the following  meanings
and  the  following definitions shall be equally applicable to  both  the
singular and plural forms of any of the terms herein defined:
     
     "Acquiring  Person"  shall mean a "person"  or  "group  of  persons"
within  the  meaning  of Section 13(d) and 14(d) of  the  Securities  and
Exchange Act of 1934, as amended.
     
     "Adjusted Consolidated Operating Earnings" for any period shall mean
the  sum of (a) Consolidated Operating Earnings, plus (b) Rentals  (other
than  Rentals  on Capitalized Leases) payable during such period  by  the
Company and its Subsidiaries.
     
     "Affiliate"  shall  mean  any  Person  (other  than  a  Wholly-owned
Subsidiary  and any holder of the Notes) (a) which directly or indirectly
through one or more intermediaries controls, or is controlled by,  or  is
under  common control with, the Company, (b) which beneficially  owns  or
holds 10% or more of any class of the Voting Stock of the Company or  (c)
10%  or more of the Voting Stock (or in the case of a Person which is not
a  corporation,  10%  or  more  of  the  equity  interest)  of  which  is
beneficially  owned  or held by the Company or a  Subsidiary.   The  term
"control" means the possession, directly or indirectly, of the  power  to
direct or cause the direction of the management and policies of a Person,
whether through the ownership of Voting Stock, by contract or otherwise.
     
     "American  Space  Lines" shall mean the joint  venture  between  the
Company  and  Rockwell International Corporation to  develop,  construct,
operate  and market the X-34 small reusable launch vehicles, an Affiliate
of the Company.
     
     "Bank  Credit Agreement" shall mean the Amended and Restated  Credit
and  Reimbursement  Agreement dated as of September 27,  1994  among  the
Banks  named  therein,  Morgan Guaranty Trust Company  of  New  York,  as
Administrative  Agent,  and J.P. Morgan Delaware,  as  Collateral  Agent,
including any extensions, renewals or replacements thereof.
     
     "Business  Day" shall mean any day other than a Saturday, Sunday  or
other  day on which banks in Dulles, Virginia or New York, New  York  are
required by law to close or are customarily closed.
     
     "Capitalized Lease" shall mean any lease the obligation for  Rentals
with  respect  to which is required to be capitalized on  a  consolidated
balance sheet of the lessee and its subsidiaries in accordance with GAAP.
     
     "Capitalized Rentals" of any Person shall mean as of the date of any
determination thereof the amount at which the aggregate Rentals  due  and
to  become due under all Capitalized Leases under which such Person is  a
lessee would be reflected as a liability on a consolidated balance  sheet
of such Person.
     
     "Change  of Control" shall mean the earliest to occur of:   (1)  the
date  the  Company  enters  into  a binding  written  agreement  with  an
Acquiring Person to permit such Acquiring Person to acquire, directly  or
indirectly, beneficial ownership of 30% or more of the total Voting Stock
of  the  Company  then outstanding, or (2) the date  a  tender  offer  or
exchange  offer  results in an Acquiring Person, directly or  indirectly,
beneficially owning 30% or more of the total Voting Stock of the  Company
then  outstanding, or (3) the date an Acquiring Person becomes,  directly
or  indirectly, the beneficial owner of 30% or more of the  total  Voting
Stock  of  the  Company then outstanding, or (4) the  date  of  a  merger
between  the Company and any other Person, a consolidation of the Company
with  any  other  Person or an acquisition of any  other  Person  by  the
Company, if immediately after such event, the Acquiring Person shall hold
30%  or  more  of  the  total  Voting Stock of  the  Company  outstanding
immediately  after  giving  effect  to  such  merger,  consolidation   or
acquisition, or, if the Company shall not be the surviving entity, of the
surviving, resulting or continuing corporation, or (5) during any  period
of  12  consecutive  calendar months, the date on which  individuals  who
served as Directors on the Company's Board of Directors on the first  day
of  such  period  shall cease to constitute a majority of  the  Board  of
Directors of the Company.
     
     "Code" shall mean the Internal Revenue Code of 1986, as amended, and
the regulations from time to time promulgated thereunder.
     
     "Company"  shall  mean  Orbital  Sciences  Corporation,  a  Delaware
corporation, and any Person who succeeds to all, or substantially all, of
the assets and business of Orbital Sciences Corporation.
     
     "Consolidated  Fixed  Charges"  for  any  period  shall  mean  on  a
consolidated  basis  the sum of (a) all Rentals (other  than  Rentals  on
Capitalized  Leases) payable during such period by the  Company  and  its
Subsidiaries,  and  (b)  all  Interest Expense  (including  the  interest
component  of  Rentals  on Capitalized Leases) of  the  Company  and  its
Subsidiaries.   For purposes of any determination of  Consolidated  Fixed
Charges  pursuant  to 5.8, the Company shall include "consolidated  fixed
charges" relating to Funded Debt (determined in a manner consistent  with
the   definition  of  "Consolidated  Fixed  Charges"  contained  in  this
Agreement),  on a pro forma basis, which were incurred in the immediately
preceding  four  fiscal quarter period by any business entity  to  be  or
actually  acquired  by  the  Company or  any  of  its  Subsidiaries,  and
concurrently with such determination, the Company shall have furnished to
the holders of the Notes audited financial statements (if the Company  is
required   pursuant  to  Regulation  S-X  to  prepare  audited  financial
statements in connection with such acquisition or otherwise to the extent
available) and other financial information with respect to such  business
entity  demonstrating to the reasonable satisfaction of such holders  the
basis  for  the  inclusion and computations of such  "consolidated  fixed
charges".
     
     "Consolidated Funded Debt" shall mean all Funded Debt of the Company
and  its  Subsidiaries,  determined on a consolidated  basis  eliminating
intercompany items.
     
     "Consolidated  Net  Income"  for any period  shall  mean  the  gross
revenues  of  the Company and its Subsidiaries for such period  less  all
expenses and other proper charges (including taxes on income), determined
on a consolidated basis after eliminating earnings or losses attributable
to outstanding Minority Interests, but excluding in any event:
     
          (a)    any gains or losses on the sale or other disposition  of
     Investments  or  fixed  or capital assets, and  any  taxes  on  such
     excluded gains and any tax deductions or credits on account  of  any
     such excluded losses;
     
         (b)   the proceeds of any life insurance policy;
     
         (c)   net earnings and losses of any Subsidiary accrued prior to
     the  date  it became a Subsidiary, except for Subsidiaries  acquired
     using the pooling of interests accounting method;
     
          (d)    net  earnings and losses of any company  (other  than  a
     Subsidiary),  substantially  all  the  assets  of  which  have  been
     acquired in any manner by the Company or any Subsidiary, realized by
     such  company  prior  to  the date of such acquisition,  except  for
     Subsidiaries  acquired  using the pooling  of  interests  accounting
     method;
     
          (e)    net  earnings and losses of any company  (other  than  a
     Subsidiary)  with  which  the Company or  a  Subsidiary  shall  have
     consolidated or amalgamated or which shall have merged into or  with
     the Company or a Subsidiary prior to the date of such consolidation,
     amalgamation or merger, except for Subsidiaries acquired  using  the
     pooling of interests accounting method;
     
         (f)   the Company's proportionate share of earnings or losses of
     any  business entity (other than a Subsidiary or ORBCOMM Development
     or  American Space Lines) in which the Company or any Subsidiary has
     an  ownership interest unless such net earnings shall have  actually
     been  received by the Company or such Subsidiary in the form of cash
     distributions;
     
          (g)    any portion of the net earnings of any Subsidiary  which
     for  any  reason  is  unavailable for payment of  dividends  to  the
     Company or any other Subsidiary, provided that for a period  of  not
     more  than 60 days following the Closing Date, the Company shall  be
     permitted to include the net earnings of Magellan Corporation  which
     are otherwise unavailable for payment of dividends to the Company by
     reason  of restrictions contained in the Loan and Security Agreement
     dated  as  of  December 2, 1990, as amended, between Silicon  Valley
     Bank and Magellan Corporation;
     
          (h)    earnings resulting from any reappraisal, revaluation  or
     write-up of assets;
     
          (i)    any deferred or other credit representing any excess  of
     the equity in any Subsidiary at the date of acquisition thereof over
     the amount invested in such Subsidiary;
     
         (j)   any gain arising from the acquisition of any Securities of
     the Company or any Subsidiary;
     
          (k)    any  creation  or  reversal of any contingency  reserve,
     except  reserves established in connection with the  application  of
     long term contract accounting in accordance with GAAP; and
     
           (l)  any other extraordinary gain, as determined in accordance
with GAAP.
     
     "Consolidated Operating Earnings" for any period shall mean the  sum
of (a) Consolidated Net Income during such period (excluding (1) earnings
(losses)  of  ORBIMAGE  generated  by assets  which  have  been  sold  or
otherwise  encumbered  in  connection with the issuance  of  Non-Recourse
ORBIMAGE  Debt  and  (2)  "equity  in earnings  (losses)  of  affiliates"
attributable to ORBCOMM Development and American Space Lines as set forth
on the Company's consolidated financial statements for such period), plus
(b)  (to the extent deducted in determining Consolidated Net Income)  (1)
all  provisions for any Federal, state or other income taxes made by  the
Company  and  its  Subsidiaries during such period, (2) Interest  Expense
(excluding  the  capitalized portion thereof)  of  the  Company  and  its
Subsidiaries  during such period, and (3) all provisions for amortization
of  goodwill  and  debt  issuance costs  made  by  the  Company  and  its
Subsidiaries  during  such period and (4) in the  event  the  Convertible
Subordinated  Debentures  are prepaid prior to their  expressed  maturity
(other  than  upon the occurrence of a default thereunder), all  one-time
costs  and  prepaid  interest expenses incurred in connection  with  such
prepayment.  For purposes of any determination of Consolidated  Operating
Earnings   pursuant   to   5.8  and  5.12,  the   Company   may   include
"consolidated operating earnings" (determined in a manner consistent with
the  definition  of "Consolidated Operating Earnings" contained  in  this
Agreement),  on  a pro forma basis, which were earned in the  immediately
preceding  four  fiscal quarter period by any business entity  to  be  or
actually  acquired  by  the Company or any of its Subsidiaries,  provided
that  concurrently  with  such  determination,  the  Company  shall  have
furnished  to  the holders of the Notes audited financial statements  (if
the  Company  is  required pursuant to Regulation S-X to prepare  audited
financial  statements  in  connection with such  acquisition)  and  other
financial  information with respect to such business entity demonstrating
to  the  reasonable  satisfaction  of such  holders  the  basis  for  the
inclusion and computations of such "consolidated operating earnings".
     
     "Consolidated  Priority  Funded Debt" shall  mean  the  sum  of  (a)
Consolidated  Secured  Funded  Debt plus  (b)  all  Funded  Debt  of  the
Company's Subsidiaries, plus (c) all preferred stock of Subsidiaries held
by Persons other than the Company or any Wholly-owned Subsidiary.
     
     "Consolidated Secured Funded Debt" shall mean all Funded Debt of the
Company and its Subsidiaries which is secured by a mortgage, trust  deed,
deed   of  trust,  deed  to  secure  debt,  security  agreement,  pledge,
conditional  sale  or  other  title retention  agreement  or  other  like
agreement  granting or conveying a Lien upon property or  assets  of  the
Company  or  any  of  its Subsidiaries (other than Non-Recourse  ORBIMAGE
Debt).
     
     "Consolidated  Tangible Assets" shall mean as of  the  date  of  any
determination thereof the total amount of all assets of the  Company  and
its   Subsidiaries  (less  depreciation,  depletion  and  other  properly
deductible valuation reserves) after deducting (a) all assets of ORBIMAGE
and  any subsidiary of ORBIMAGE securing Non-Recourse ORBIMAGE Debt,  and
(b)  goodwill, patents, trade names, trade marks, copyrights, franchises,
experimental expense, organization expense, unamortized debt discount and
expense, deferred assets other than prepaid insurance and prepaid  taxes,
the  excess of cost of shares acquired over book value of related  assets
and  such other assets as are properly classified as "intangible  assets"
in accordance with GAAP.
     
     "Consolidated Tangible Net Worth" shall mean as of the date  of  any
determination thereof the arithmetic sum of:
     
          (a)   the amount of the capital stock accounts (net of treasury
     stock,  at  cost),  plus  (or minus in the case of  a  deficit)  the
     surplus  and  retained earnings of the Company and its Subsidiaries,
     in each case, on a consolidated basis,
     
     Minus
     
           (b)    the  net  book  value,  after  deducting  any  reserves
     applicable  thereto, of all items of the following  character  which
     are  included in the assets of the Company and its Subsidiaries,  to
     wit:
          
               (1)    the incremental increase in an asset resulting from
          any  reappraisal, revaluation or write-up of assets (other than
          write-ups  of  assets of a going-concern business  made  within
          twelve months after the acquisition of such business); and
          
               (2)    (i) unamortized debt discount and expense and  (ii)
          goodwill,  patents,  patent applications, permits,  trademarks,
          trade  names,  copyrights,  licenses, franchises,  experimental
          expense,   organizational  expense,  research  and  development
          expense  and  such other assets as are properly  classified  as
          "intangible assets" in accordance with GAAP;

all  determined in accordance with GAAP.  For purposes of any computation
of  actual  Consolidated Tangible Net Worth pursuant  to  clause  (1)  of
5.11(a),  there shall in any event be excluded an amount (not  to  exceed
$75,000,000)  equal to the sum of the aggregate net proceeds  derived  by
the  Company from the sale of any of its common stock to any Person other
than an Affiliate or a Wholly-Owned Subsidiary plus  the increase in  the
book value of the capital stock accounts of the Company arising from  the
actual  conversion  of  any  of the Convertible  Subordinated  Debentures
pursuant to the Convertible Subordinated Debenture Indenture.
     
     "Consolidated Total Capitalization" shall mean, as of  the  date  of
any  determination  thereof,  the sum of  (a)  Consolidated  Funded  Debt
(excluding Non-Recourse ORBIMAGE Debt) plus (b) the amount of the capital
stock  accounts (net of treasury stock, at cost) plus (or  minus  in  the
case  of a deficit) the surplus and retained earnings of the Company  and
its  Subsidiaries  as determined in accordance with GAAP,  plus  (c)  the
aggregate   unpaid  principal  amount  of  the  Convertible  Subordinated
Debentures.
     
     "Convertible  Subordinated  Debentures"  shall  mean  the  Company's
6-3/4%  Subordinated Convertible Debentures due March,  2003  issued  and
outstanding pursuant to the Convertible Subordinated Debenture Indenture.
     
     "Convertible  Subordinated  Debenture  Indenture"  shall  mean  that
certain  Indenture dated as of February 25, 1993 between the Company  and
Security Trust Company, N.A.
     
     "Default" shall mean any event or condition the occurrence of  which
would,  with  the  lapse  of  time or the  giving  of  notice,  or  both,
constitute an Event of Default.
     
     "Environmental Law" shall mean any international, federal, state  or
local  statute, law, regulation, order, consent decree, judgment, permit,
license,   code,   covenant,  deed  restriction,  common   law,   treaty,
convention,  ordinance or other requirement relating  to  public  health,
safety  or the environment, including, without limitation, those relating
to  releases, discharges or emissions to air, water, land or groundwater,
to  the  withdrawal  or use of groundwater, to the use  and  handling  of
polychlorinated  biphenyls  or  asbestos,  to  the  disposal,  treatment,
storage   or  management  of  hazardous  or  solid  waste,  or  Hazardous
Substances or crude oil, or any fraction thereof, or to exposure to toxic
or  hazardous  materials, to the handling, transportation,  discharge  or
release  of  gaseous or liquid Hazardous Substances and  any  regulation,
order,  notice  or  demand  issued  pursuant  to  such  law,  statute  or
ordinance, in each case applicable to the property of the Company and its
Subsidiaries  or  the  operation, construction  or  modification  of  any
thereof,  including without limitation, the following:  the Comprehensive
Environmental  Response,  Compensation and  Liability  Act  of  1980,  as
amended by the Superfund Amendments and Reauthorization Act of 1986,  the
Solid  Waste  Disposal Act, as amended by the Resource  Conservation  and
Recovery  Act  of  1976 and the Hazardous and Solid Waste  Amendments  of
1984, the Hazardous Materials Transportation Act, as amended, the Federal
Water  Pollution Control Act, as amended by the Clean Water Act of  1976,
the  Safe  Drinking  Water Control Act, the Clean Air  Act  of  1966,  as
amended, the Toxic Substances Control Act of 1976, the Emergency Planning
and  Community  Right-to-Know  Act of 1986,  the  National  Environmental
Policy  Act  of  1975, the Oil Pollution Act of 1990 and any  similar  or
implementing state law, and any state statute and any further  amendments
to these laws providing for financial responsibility for cleanup or other
actions  with  respect to the release or threatened release of  Hazardous
Substances  or  crude  oil,  or  any fraction  thereof,  and  all  rules,
regulations, guidance documents and publications promulgated thereunder.
     
     "ERISA"  shall mean the Employee Retirement Income Security  Act  of
1974,  as  amended, and any successor statute of similar import, together
with  the regulations thereunder, in each case as in effect from time  to
time.   References to sections of ERISA shall be construed to also  refer
to any successor sections.
     
     "ERISA Affiliate" shall mean any corporation, trade or business that
is,  along  with  the  Company,  a  member  of  a  controlled  group   of
corporations or a controlled group of trades or businesses, as  described
in  section 414(b) and 414(c), respectively, of the Code or Section  4001
of ERISA.
     
     "Event of Default" shall have the meaning set forth in 6.1.
     
     "Fairchild"  shall mean Fairchild Space and Defense  Corporation,  a
Delaware corporation, and Subsidiary of the Company.
     
     "Fixed  Charges  Coverage Ratio" shall mean the  ratio  of  Adjusted
Consolidated Operating Earnings for the immediately preceding four fiscal
quarter period to Consolidated Fixed Charges for such four fiscal quarter
period.
     
     "Funded Debt" of any Person shall mean (a) all Indebtedness of  such
Person  for borrowed money or which has been incurred in connection  with
the acquisition of assets in each case having a final maturity of one  or
more than one year from the date of origin thereof (or which is renewable
or  extendible at the option of the obligor for a period or periods  more
than one year from the date of origin), including all payments in respect
thereof that are required to be made within one year from the date of any
determination of Funded Debt, whether or not the obligation to make  such
payments shall constitute a current liability of the obligor under  GAAP,
(b)  all  Capitalized Rentals of such Person, and (c) all  Guaranties  by
such  Person of Funded Debt of others.  "Funded Debt" shall in any  event
include  Indebtedness outstanding under and pursuant to the  Bank  Credit
Agreement.
     
     "GAAP"  shall mean generally accepted accounting principles  at  the
time.
     
     "Guaranties"  by any Person shall mean all obligations  (other  than
endorsements in the ordinary course of business of negotiable instruments
for  deposit  or collection) of such Person guaranteeing,  or  in  effect
guaranteeing, any Indebtedness, dividend or other obligation of any other
Person  (the  "primary  obligor")  in any  manner,  whether  directly  or
indirectly,  including,  without  limitation,  all  obligations  incurred
through  an agreement, contingent or otherwise, by such Person:   (a)  to
purchase  such  Indebtedness or obligation  or  any  property  or  assets
constituting  security therefor, (b) to advance or supply funds  (1)  for
the  purchase or payment of such Indebtedness or obligation,  or  (2)  to
maintain  working  capital  or  any balance  sheet  or  income  statement
condition  or  otherwise  to  advance or make  available  funds  for  the
purchase  or  payment of such Indebtedness or obligation,  (c)  to  lease
property  or  to  purchase  Securities  or  other  property  or  services
primarily  for the purpose of assuring the owner of such Indebtedness  or
obligation of the ability of the primary obligor to make payment  of  the
Indebtedness or obligation, or (d) otherwise to assure the owner  of  the
Indebtedness or obligation of the primary obligor against loss in respect
thereof.  For the purposes of all computations made under this Agreement,
a  Guaranty  in respect of any Indebtedness for borrowed money  shall  be
deemed  to  be Indebtedness equal to the outstanding principal amount  of
such  Indebtedness  for borrowed money which has been guaranteed,  and  a
Guaranty  in respect of any other obligation or liability or any dividend
shall  be deemed to be Indebtedness equal to the maximum aggregate amount
of such obligation, liability or dividend.
     
     "Hazardous  Substance" shall mean any hazardous or  toxic  material,
substance or waste, pollutant or contaminant which is regulated under any
statute, law, ordinance, rule or regulation of any local, state, regional
or federal authority having jurisdiction over the property of the Company
and  its  Subsidiaries  or its use, including  but  not  limited  to  any
material,  substance  or  waste which is:  (a)  defined  as  a  hazardous
substance  under Section 311 of the Federal Water Pollution Control  Act,
as  amended;  (b)  regulated as a hazardous waste under Section  1004  or
Section 3001 of the Federal Solid Waste Disposal Act, as amended  by  the
Resource  Conservation and Recovery Act, as amended;  (c)  defined  as  a
hazardous  substance under Section 101 of the Comprehensive Environmental
Response,  Compensation and Liability Act, as amended; or (d) defined  or
regulated as a hazardous substance or hazardous waste under any rules  or
regulations promulgated under any of the foregoing statutes.
     
     "Indebtedness" of any Person shall mean and include all  obligations
of  such Person which in accordance with GAAP shall be classified upon  a
balance  sheet of such Person as liabilities of such Person, and  in  any
event shall include all (a) obligations of such Person for borrowed money
or  which  have  been  incurred in connection  with  the  acquisition  of
property or assets, (b) obligations secured by any Lien upon property  or
assets  owned by such Person, even though such Person has not assumed  or
become  liable  for  the  payment of such  obligations,  (c)  obligations
created  or  arising under any conditional sale or other title  retention
agreement   with   respect   to  property  acquired   by   such   Person,
notwithstanding  the  fact that the rights and remedies  of  the  seller,
lender or lessor under such agreement in the event of default are limited
to  repossession  or sale of property, (d) Capitalized  Rentals  and  (e)
Guaranties of obligations of others of the character referred to in  this
definition.
     
     "Institutional Holder" shall mean any of the following Persons:  (a)
any  bank,  savings  and  loan  association, savings  institution,  trust
company or national banking association, acting for its own account or in
a  fiduciary  capacity, (b) any charitable foundation, (c) any  insurance
company,  (d) any fraternal benefit society, (e) any pension,  retirement
or profit-sharing trust or fund within the meaning of Title I of ERISA or
for  which  any  bank,  trust company, national  banking  association  or
investment adviser registered under the Investment Advisers Act of  1940,
as  amended, is acting as trustee or agent, (f) any investment company or
business development company, as defined in the Investment Company Act of
1940,  as  amended,  (g)  any  investment adviser  registered  under  the
Investment  Advisers  Act of 1940, as amended, (h)  any  government,  any
public  employees' pension or retirement system, or any other  government
agency  supervising the investment of public funds, (i) any other  entity
all  of  the equity owners of which are Institutional Holders or (j)  any
other   Person   which  may  be  within  the  definition  of   "qualified
institutional buyer" as such term is used in Rule 144A, as from  time  to
time in effect, promulgated under the Securities Act of 1933, as amended.
     
     "Interest  Expense" for any period shall mean all interest  (whether
or  not capitalized) and all amortization of debt discount and expense on
any    particular    Indebtedness   (including,    without    limitation,
payment-in-kind, zero coupon and other like Securities)  for  which  such
calculations  are  being  made;  provided  that,  for  purposes  of   any
calculation  of Interest Expense of the Company pursuant to 5.8,  in  the
event  the Convertible Subordinated Debentures are prepaid prior to their
expressed  maturity  (other  than  upon  the  occurrence  of  a   default
thereunder), all one-time costs and prepaid interest expenses incurred by
the Company in connection with any such prepayment shall be excluded from
such  calculation  for the period in which such costs  and  expenses  are
paid.   Computations  of  Interest Expense  on  a  pro  forma  basis  for
Indebtedness having a variable interest rate shall be calculated  at  the
rate in effect on the date of any determination.
     
     "Investments" shall mean all investments, in cash or by delivery  of
property,  made  directly  or  indirectly  in  any  Person,  whether   by
acquisition of shares of capital stock, Indebtedness or other obligations
or  Securities  or by loan, advance, capital contribution  or  otherwise;
provided  that  "Investments" shall not in  any  event  mean  or  include
routine investments in property or assets to be used or consumed  in  the
ordinary course of business.
     
     "Lien"  shall  mean any interest in property securing an  obligation
owed  to,  or a claim by, a Person other than the owner of the  property,
whether  such  interest is based on the common law, statute or  contract,
and  including but not limited to the security interest lien arising from
a  mortgage, encumbrance, pledge, conditional sale or trust receipt or  a
lease,  consignment or bailment for security purposes.  The  term  "Lien"
shall include reservations, exceptions, encroachments, easements, rights-
of-way,  covenants,  conditions, restrictions,  leases  and  other  title
exceptions   and   encumbrances  (including,  with  respect   to   stock,
stockholder agreements, voting trust agreements, buy-back agreements  and
all  similar arrangements) affecting property.  For the purposes of  this
Agreement, the Company or a Subsidiary shall be deemed to be the owner of
any property which it has acquired or holds subject to a conditional sale
agreement, Capitalized Lease or other arrangement pursuant to which title
to  the property has been retained by or vested in some other Person  for
security purposes and such retention or vesting shall constitute a Lien.
     
     "Make-Whole Amount" shall mean in connection with any prepayment  or
acceleration  of  the  Notes the excess, if any,  of  (a)  the  aggregate
present value as of the date of such prepayment or payment of each dollar
of  principal being prepaid or paid (taking into account the  application
of  such  prepayment  and payments required by 2.1)  and  the  amount  of
interest  (exclusive  of interest accrued to the date  of  prepayment  or
payment) that would have been payable in respect of such dollar  if  such
prepayment  or payment had not been made, determined by discounting  such
amounts at the Reinvestment Rate from the respective dates on which  they
would  have  been payable, over (b) 100% of the principal amount  of  the
outstanding  Notes  being prepaid or paid.  If the Reinvestment  Rate  is
equal to or higher than 10.50%, the Make-Whole Amount shall be zero.  For
purposes of any determination of the Make-Whole Amount:
          
          "Reinvestment Rate" shall mean (1) the sum of 0.50%, plus   the
     yield  reported  on  page "USD" of the Bloomberg  Financial  Markets
     Services   Screen  (or,  if  not  available,  any  other  nationally
     recognized trading screen reporting on-line intraday trading in  the
     United  States government Securities) at 11:00 A.M. (New  York,  New
     York  time)  for  the United States government Securities  having  a
     maturity  (rounded  to  the  nearest  month)  corresponding  to  the
     remaining Weighted Average Life to Maturity of the principal of  the
     Notes being prepaid or paid (taking into account the application  of
     such  prepayment and payments required by 2.1) or (2) in  the  event
     that  no  nationally  recognized trading  screen  reporting  on-line
     intraday  trading  in  the  United States government  Securities  is
     available, Reinvestment Rate shall mean the sum of 0.50%,  plus  the
     arithmetic mean of the yields for the two columns under the  heading
     "Week Ending" published in the Statistical Release under the caption
     "Treasury  Constant  Maturities" for the maturity  (rounded  to  the
     nearest  month)  corresponding  to  the  Weighted  Average  Life  to
     Maturity of the principal of the Notes being prepaid or paid (taking
     into account the application of such prepayment payments required by
     2.1).   If no maturity exactly corresponds to such Weighted  Average
     Life  to  Maturity,  yields  for the two published  maturities  most
     closely  corresponding  to such Weighted Average  Life  to  Maturity
     shall  be  calculated pursuant to the immediately preceding sentence
     and the Reinvestment Rate shall be interpolated or extrapolated from
     such  yields  on  a straight-line basis, rounding in  each  of  such
     relevant  periods  to  the  nearest  month.   For  the  purposes  of
     calculating  the  "Reinvestment Rate", the most  recent  Statistical
     Release  published prior to the date of determination of  the  Make-
     Whole Amount shall be used.
          
          "Statistical  Release"  shall  mean  the  then  most   recently
     published   statistical  release  designated  "H.15(519)"   or   any
     successor  publication  which is published  weekly  by  the  Federal
     Reserve System and which establishes yields on actively traded  U.S.
     Government  Securities adjusted to constant maturities or,  if  such
     statistical   release  is  not  published  at  the   time   of   any
     determination hereunder, then such other reasonably comparable index
     which  shall  be designated by the holders of 66-2/3%  in  aggregate
     principal amount of the outstanding Notes.
          
          "Weighted Average Life to Maturity" of the principal amount  of
     the  Notes being prepaid or paid shall mean, as of the time  of  any
     determination thereof, the number of years obtained by dividing  the
     then  Remaining  Dollar-Years of such  principal  by  the  aggregate
     amount of such principal.  The term "Remaining Dollar-Years" of such
     principal  shall  mean the amount obtained by  (1)  multiplying  the
     amount  of  principal that would have become due on  each  scheduled
     payment date if such prepayment or payment had not been made by  the
     number  of years (calculated to the nearest one-twelfth) which  will
     elapse  between the date of determination and such scheduled payment
     date, and (2) totalling the products obtained in (1).
     
     "Minority Interests" shall mean any shares of stock or other  equity
or  ownership  interests  of  any  class  of  a  Subsidiary  (other  than
directors'  qualifying shares as required by law) that are not  owned  by
the  Company and/or one or more of its Subsidiaries.  Minority  Interests
shall  be  valued  by  valuing Minority Interests constituting  preferred
stock at the voluntary or involuntary liquidating value of such preferred
stock,   whichever   is  greater,  and  by  valuing  Minority   Interests
constituting  common  stock  at the book value  of  capital  and  surplus
applicable  thereto adjusted, if necessary, to reflect any  changes  from
the  book value of such common stock required by the foregoing method  of
valuing Minority Interests in preferred stock.
     
     "Multiemployer Plan" shall have the same meaning as in ERISA.
     
     "Non-Recourse  ORBIMAGE Debt" shall mean Indebtedness  for  borrowed
money of ORBIMAGE not to exceed $75,000,000 in aggregate principal amount
created  in  connection with up to three separate financing  transactions
pursuant to which ORBIMAGE (or any subsidiary of ORBIMAGE created for the
purpose   of   participating  in  such  transaction)  shall  incur   such
Indebtedness  in order to finance the construction of ORBIMAGES's  remote
sensing  system, provided that recourse for payment of such  Indebtedness
for  borrowed  money  is expressly limited to the revenues  generated  by
purchase  contracts  entered into by ORBIMAGE with  customers  purchasing
satellite-based remote sensing data and related services  (the  "Contract
Revenues"), and provided, further, that with respect to such Indebtedness
for borrowed money neither the Company, ORBIMAGE or any other Subsidiary,
nor  any of the property or assets of the Company, ORBIMAGE or any  other
Subsidiary,  other than the Contract Revenues, is directly or  indirectly
liable in any manner whatsoever for the payment thereof.
     
     "ORBCOMM" shall mean Orbital Communications Corporation, a  Delaware
corporation and Subsidiary of the Company.
     
     "ORBCOMM  Development"  shall  mean  ORBCOMM  Development,  L.P.,  a
Delaware limited partnership and Affiliate of the Company.
     
     "ORBIMAGE"  shall  mean  Orbital  Imaging  Corporation,  a  Delaware
corporation and Subsidiary of the Company.
     
     "Overdue  Rate"  shall mean the lesser of (a) the  maximum  interest
rate permitted by law and (b) the greater of (1) 12.50% per annum and (2)
the  rate which Morgan Guaranty Trust Company of New York, New York City,
New  York,  announces from time to time as its prime lending rate  as  in
effect from time to time, plus 2%.
     
     "PBGC"  shall mean the Pension Benefit Guaranty Corporation and  any
entity succeeding to any or all of its functions under ERISA.
     
     "Person"  shall  mean an individual, partnership, limited  liability
company,  corporation,  trust  or  unincorporated  organization,  and   a
government or agency or political subdivision thereof.
     
     "Plan"  shall  mean  a "pension plan," as such term  is  defined  in
ERISA, which is qualified under the Code and is established or maintained
by  the Company or any ERISA Affiliate or as to which the Company or  any
ERISA  Affiliate  contributed or is a member or otherwise  may  have  any
liability.
     
     "Purchaser" shall have the meaning set forth in 1.1.
     
     "Regulation  S-X"  shall mean Regulation S-X promulgated  under  the
Securities Exchange Act of 1934, as amended.
     
     "Rentals" shall mean and include as of the date of any determination
thereof  all  fixed  payments (including as such all payments  which  the
lessee is obligated to make to the lessor on termination of the lease  or
surrender  of  the property) payable by the Company or a  Subsidiary,  as
lessee  or sublessee under a lease of real or personal property,  net  of
sublease  income, but shall be exclusive of any amounts  required  to  be
paid  by the Company or a Subsidiary (whether or not designated as  rents
or additional rents) on account of maintenance, repairs, insurance, taxes
and similar charges.  Fixed rents under any so-called "percentage leases"
shall  be  computed  solely on the basis of the minimum  rents,  if  any,
required  to  be paid by the lessee regardless of sales volume  or  gross
revenues.
     
     "Reportable Event" shall have the same meaning as in Section 4043 of
ERISA,  other  than a Reportable Event as to which the  provision  of  30
days'  notice  to  the  PBGC  is  waived  under  applicable  regulations;
provided,   however,  that  Reportable  Events  described   in   Sections
4043(c)(1)  and  4043(c)(5) of ERISA shall constitute  Reportable  Events
regardless of the issuance of any waiver of the reporting requirement  by
the PBGC.
     
     "Responsible  Officer" shall mean the Chairman  of  the  Board,  the
President, any Senior Vice President, the Treasurer, the Chief  Executive
Officer or the Chief Financial Officer of the Company.
     
     "Restricted Investments" shall mean all Investments, other than:
     
          (a)    Investments  by  the Company and  its  Subsidiaries,  in
     addition  to  Investments  set forth  on  Schedule  II,  in  and  to
     Subsidiaries,   including  any  Investment  in  a   corporation   or
     partnership (including the secondary purchase of Securities of  such
     corporation  or  partnership) which, after  giving  effect  to  such
     Investment, will become a Subsidiary;
     
          (b)    Investments of the Company and its Subsidiaries existing
     as of the Closing Date and described on Schedule II hereto;
     
         (c)   receivables arising from the sale of goods and services in
     the ordinary course of business of the Company and its Subsidiaries;
     
          (d)   Investments made by the Company after the Closing Date in
     connection  with (i) the development and growth of the  business  of
     ORBCOMM Development, and (ii) the formation and development  of  the
     business of American Space Lines, provided that the aggregate amount
     of  such additional Investments shall not exceed $75,000,000 in  the
     aggregate;
     
          (e)   Investments in commercial paper of corporations organized
     under the laws of the United States or any state thereof maturing in
     360  days  or less from the date of issuance which, at the  time  of
     acquisition by the Company or any Subsidiary, is accorded  a  rating
     of  "A-1"  or better by Standard & Poor's Ratings Group or "P-1"  by
     Moody's Investors Service, Inc.;
     
          (f)   Investments in direct obligations of the United States of
     America  or  any agency or instrumentality of the United  States  of
     America, the payment or guarantee of which constitutes a full  faith
     and  credit  obligation of the United States of America,  in  either
     case,  maturing  within twelve months from the date  of  acquisition
     thereof;
     
          (g)    Investments in certificates of deposit and time deposits
     maturing  within one year from the date of issuance thereof,  either
     (1)  issued by a bank or trust company organized under the  laws  of
     the  United States or any state thereof, having capital, surplus and
     undivided  profits aggregating at least $100,000,000, provided  that
     at  the  time of acquisition thereof by the Company or a Subsidiary,
     the senior unsecured long-term debt of such bank or trust company or
     of  the holding company of such bank or trust company is rated  "A-"
     or  better  by  Standard  & Poor's Ratings  Group,  Fitch  Investors
     Service, Inc. or Duff & Phelps Credit Rating Co., or "A3" or  better
     by  Moody's  Investors Service, Inc. or (2) issued by  any  bank  or
     trust  company organized under the laws of the United States or  any
     state  thereof to the extent that such Investments are fully insured
     by the Federal Depository Insurance Corporation;
     
           (h)     Investments  in  readily-marketable   obligations   of
     indebtedness  of any State of the United States or any  municipality
     organized  under the laws of any State of the United States  or  any
     political  subdivision thereof which, at the time of acquisition  by
     the  Company  or any Subsidiary, are accorded a rating  of  "AA"  or
     better  by Standard & Poor's Ratings Group, Fitch Investors Service,
     Inc.  or  Duff  &  Phelps Credit Rating Co., or "Aa"  or  better  by
     Moody's  Investors Service, Inc. or an equivalent rating by  another
     nationally recognized credit rating agency of similar standard which
     in  any  such case mature no later than one year after the  date  of
     acquisition thereof; and
     
          (i)   Investments in repurchase agreements with respect to  any
     Securities  described  in  clauses (e), (f),  (g)  or  (h)  of  this
     definition  entered  into  with a depository  institution  or  trust
     company  acting  as  principal  described  in  clause  (g)  of  this
     definition  if such repurchase agreements are by their terms  to  be
     performed  by the repurchase obligor and such repurchase  agreements
     are deposited with a bank or trust company of the type described  in
     clause (g) of this definition.
     
     "Security"  shall have the same meaning as in Section  2(1)  of  the
Securities Act of 1933, as amended.
     
     The  term  "subsidiary"  shall  mean as  to  any  particular  parent
corporation  any corporation or partnership of which more  than  50%  (by
number  of votes) of the Voting Stock or partnership interests  shall  be
beneficially  owned, directly or indirectly, by such  parent  corporation
and  which  is required to be consolidated in accordance with GAAP.   The
term "Subsidiary" shall mean a subsidiary of the Company.
     
     "Voting  Stock" shall mean Securities of any class or  classes,  the
holders  of  which  are  ordinarily, in  the  absence  of  contingencies,
entitled  to  elect  a  majority of the corporate directors  (or  Persons
performing similar functions).
     
     "Wholly-owned"  when  used in connection with any  Subsidiary  shall
mean  a  Subsidiary of which all of the issued and outstanding shares  of
stock  (except shares required as directors' qualifying shares)  and  all
Indebtedness for borrowed money shall be owned by the Company and/or  one
or more of its Wholly-owned Subsidiaries, provided, however, that so long
as  the  Company  shall own 90% or more of the Voting Stock  of  ORBCOMM,
ORBCOMM  shall be deemed to be a Wholly-Owned Subsidiary for all purposes
of this Agreement.

Section8.2.Accounting Principles.  Where the character or amount  of  any
asset  or  liability  or  item of income or expense  is  required  to  be
determined  or  any  consolidation  or other  accounting  computation  is
required to be made for the purposes of this Agreement, the same shall be
done in accordance with GAAP, to the extent applicable, except where  the
requirements  of  this Agreement are, by their terms,  inconsistent  with
GAAP.

Section8.3.Directly or Indirectly.  Where any provision in this Agreement
refers  to  action  to be taken by any Person, or which  such  Person  is
prohibited  from taking, such provision shall be applicable  whether  the
action in question is taken directly or indirectly by such Person.


Section9.Miscellaneous.

Section9.1.Registered Notes.  The Company shall cause to be kept  at  its
principal  office  a register for the registration and  transfer  of  the
Notes,  and  the  Company  will register  or  transfer  or  cause  to  be
registered  or  transferred, as hereinafter  provided,  any  Note  issued
pursuant to this Agreement.
     
     At  any time and from time to time the holder of any Note which  has
been  duly registered as hereinabove provided may transfer such Note upon
surrender thereof at the principal office of the Company duly endorsed or
accompanied  by  a written instrument of transfer duly  executed  by  the
holder of such Note or its attorney duly authorized in writing.
     
     The  Person  in  whose  name any Note shall be registered  shall  be
deemed  and  treated as the owner and holder thereof for all purposes  of
this  Agreement.  Payment of or on account of the principal, premium,  if
any,  and interest on any Note shall be made to or upon the written order
of such holder.

Section9.2.Exchange of Notes.  At any time and from time  to  time,  upon
not less than five days' notice to that effect given by the holder of any
Note initially delivered or of any Note substituted therefor pursuant  to
9.1,  this  9.2 or 9.3, and, upon surrender of such Note at  its  office,
the  Company will deliver in exchange therefor, without expense  to  such
holder,  except  as  set  forth  below, a Note  for  the  same  aggregate
principal  amount  as the then unpaid principal amount  of  the  Note  so
surrendered, or Notes in the denomination of $1,000,000 (or  such  lesser
amount  as  shall  constitute 100% of the Notes of such  holder)  or  any
amount  in excess thereof as such holder shall specify, dated as  of  the
date  to which interest has been paid on the Note so surrendered  or,  if
such  surrender  is  prior to the payment of any interest  thereon,  then
dated  as of the date of issue, registered in the name of such Person  or
Persons  as may be designated by such holder, and otherwise of  the  same
form and tenor as the Notes so surrendered for exchange.  The Company may
require  the  payment  of  a sum sufficient to cover  any  stamp  tax  or
governmental charge imposed upon such exchange or transfer.

Section9.3.Loss,  Theft,  Etc.  of  Notes.   Upon  receipt  of   evidence
satisfactory to the Company of the loss, theft, mutilation or destruction
of  any Note, and in the case of any such loss, theft or destruction upon
delivery  of  a  bond of indemnity in such form and amount  as  shall  be
reasonably  satisfactory  to  the  Company,  or  in  the  event  of  such
mutilation upon surrender and cancellation of the Note, the Company  will
make  and  deliver without expense to the holder thereof, a new Note,  of
like  tenor,  in lieu of such lost, stolen, destroyed or mutilated  Note.
If  the Purchaser or any subsequent Institutional Holder is the owner  of
any  such  lost,  stolen  or destroyed Note, then  the  affidavit  of  an
authorized  officer of such owner, setting forth the fact of loss,  theft
or  destruction  and of its ownership of such Note at the  time  of  such
loss,  theft  or  destruction shall be accepted as satisfactory  evidence
thereof and no further indemnity shall be required as a condition to  the
execution and delivery of a new Note other than the written agreement  of
such owner to indemnify the Company.

Section9.4.Expenses,   Stamp  Tax  Indemnity.    Whether   or   not   the
transactions herein contemplated shall be consummated, the Company agrees
to pay directly all of your out-of-pocket expenses in connection with the
preparation,   execution  and  delivery  of  this   Agreement   and   the
transactions  contemplated  hereby, including  but  not  limited  to  the
charges  and  disbursements of Chapman and Cutler, your special  counsel,
duplicating  and  printing  costs and charges  for  shipping  the  Notes,
adequately insured to you at your home office or at such other  place  as
you  may  designate,  and all such expenses relating to  any  amendments,
waivers or consents requested or agreed to by the Company pursuant to the
provisions  hereof  (whether or not the same are  actually  executed  and
delivered),  including, without limitation, any amendments,  waivers,  or
consents  resulting  from  any work-out, renegotiation  or  restructuring
relating to the performance by the Company of its obligations under  this
Agreement  and  the Notes.  The Company also agrees to pay,  within  five
Business Days of receipt thereof, supplemental statements of Chapman  and
Cutler for disbursements unposted or not incurred as of the Closing Date.
The Company further agrees that it will pay and save you harmless against
any  and  all  liability with respect to stamp and other taxes,  if  any,
which  may  be  payable  or  which may be determined  to  be  payable  in
connection  with  the  execution and delivery of this  Agreement  or  the
Notes, whether or not any Notes are then outstanding.  The Company agrees
to  protect  and  indemnify you against any liability  for  any  and  all
brokerage  fees and commissions payable or claimed to be payable  to  any
Person   in  connection  with  the  transactions  contemplated  by   this
Agreement.  Without limiting the foregoing, the Company agrees to pay the
cost  of  obtaining  the  private placement  number  for  the  Notes  and
authorizes  the  submission of such information as  may  be  required  by
Standard & Poor's CUSIP Service Bureau for the purpose of obtaining  such
number.

Section9.5.Powers and Rights Not Waived; Remedies Cumulative.   No  delay
or  failure on the part of the holder of any Note in the exercise of  any
power or right shall operate as a waiver thereof; nor shall any single or
partial  exercise  of  the same preclude any other  or  further  exercise
thereof, or the exercise of any other power or right, and the rights  and
remedies  of  the  holder  of any Note are cumulative  to,  and  are  not
exclusive  of,  any  rights or remedies any such holder  would  otherwise
have.

Section9.6.Notices.  All communications provided for hereunder  shall  be
in  writing and, if to you, delivered or mailed prepaid by registered  or
certified  mail  or overnight air courier, or by facsimile communication,
in  each case addressed to you at your address appearing on Schedule I to
this  Agreement or such other address as you or the subsequent holder  of
any Note initially issued to you may designate to the Company in writing,
and  if  to  the Company, delivered or mailed by registered or  certified
mail  or  overnight  air courier, or by facsimile communication,  to  the
Company  at 21700 Atlantic Boulevard, Dulles, Virginia  20166, Attention:
Chief  Financial Officer, or to such other address as the Company may  in
writing  designate to you or to a subsequent holder of the Note initially
issued  to you; provided, however, that a notice to you by overnight  air
courier  shall only be effective if delivered to you at a street  address
designated  for  such  purpose in Schedule I, and  a  notice  to  you  by
facsimile   communication  shall  only  be  effective  if  confirmed   by
transmission of a copy thereof by prepaid overnight air courier,  or,  in
either  case, as you or a subsequent holder of any Note initially  issued
to you may designate to the Company in writing.

Section9.7.Successors and Assigns.  This Agreement shall be binding  upon
the  Company  and  its  successors and assigns and shall  inure  to  your
benefit and to the benefit of your successors and assigns, including each
successive holder or holders of any Notes.

Section9.8.Survival  of  Covenants and Representations.   All  covenants,
representations  and warranties made by the Company  herein  and  in  any
certificates delivered pursuant hereto, whether or not in connection with
the  Closing  Date, shall survive the closing and the  delivery  of  this
Agreement and the Notes.

Section9.9.Severability.   Should any part  of  this  Agreement  for  any
reason  be  declared  invalid or unenforceable, such decision  shall  not
affect  the  validity or enforceability of any remaining  portion,  which
remaining  portion shall remain in force and effect as if this  Agreement
had  been  executed  with  the invalid or unenforceable  portion  thereof
eliminated and it is hereby declared the intention of the parties  hereto
that  they  would have executed the remaining portion of  this  Agreement
without including therein any such part, parts or portion which may,  for
any reason, be hereafter declared invalid or unenforceable.

Section9.10.Governing Law.  This Agreement and the Notes issued and  sold
hereunder shall be governed by and construed in accordance with  Illinois
law, including all matters of construction, validity and performance.

Section9.11.Captions.  The descriptive headings of the  various  Sections
or  parts of this Agreement are for convenience only and shall not affect
the meaning or construction of any of the provisions hereof.
     
     The  execution hereof by you shall constitute a contract between  us
for  the uses and purposes hereinabove set forth, and this Agreement  may
be  executed  in  any  number of counterparts, each executed  counterpart
constituting an original but all together only one agreement.

                                    Orbital Sciences Corporation



                                    By /s/ Carlton B. Crenshaw
                                      Its  Sr. Vice President/Finance
                                      and Administration and Treasurer

Accepted as of June 14, 1995.

                                      The Northwestern Mutual Life
                                      Insurance Company



                                      By /s/ A. Kipp Koester
                                       Its Vice President

<PAGE>
                                                                Exhibit B

                     Representations and Warranties
                                    
     
     The Company represents and warrants to you as follows:

     1.   Subsidiaries.  Schedule II attached to the Agreement states the
name  of  each  of  the  Company's  Subsidiaries,  its  jurisdiction   of
incorporation,  the percentage of its Voting Stock owned by  the  Company
and/or  its  Subsidiaries  and the foreign jurisdictions  in  which  such
Subsidiary  is qualified to do business.  The Company and each Subsidiary
has  good and marketable title to all of the equity interests it purports
to own of each Subsidiary, free and clear in each case of any Lien except
as  disclosed  on  Annex 1 hereto.  All shares of stock  of  Subsidiaries
which are corporations have been duly issued and are fully paid and  non-
assessable.

      2.    Corporate Organization and Authority.  The Company, and  each
Subsidiary,
     
          (a)   is a corporation or a limited partnership duly organized,
     validly  existing  and  in  good standing  under  the  laws  of  its
     jurisdiction of incorporation;
     
          (b)    has  all requisite power and authority and all  material
     licenses and permits to own and operate its properties and to  carry
     on its business as now conducted; and
     
         (c)   is duly licensed or qualified and is in good standing as a
     foreign   corporation  or  limited  partnership  in  each   of   the
     jurisdictions noted on Schedule II to the Agreement, which  Schedule
     II contains a listing of all jurisdictions wherein the nature of the
     business  transacted by it or the nature of the  property  owned  or
     leased by it requires such licensing or qualification, except  where
     the  failure to be so licensed or qualified could not reasonably  be
     expected to have a material adverse effect on the Company.

     3.   Business and Property.  You have heretofore been furnished with
a  copy  of  the  undated Private Placement Memorandum (the "Memorandum")
prepared  by GECC Capital Markets Group, Inc. which generally sets  forth
the  business conducted and proposed to be conducted by the  Company  and
its  Subsidiaries  and the principal properties of the  Company  and  its
Subsidiaries.

      4.   Financial Statements.  (a) The consolidated balance sheets  of
the  Company and its Subsidiaries as of December 31 in each of the  years
1990 to 1994, both inclusive, and the related consolidated statements  of
income, stockholders' equity and cash flows for the fiscal years ended on
said  dates, each accompanied by a report thereon containing  an  opinion
unqualified as to scope limitations imposed by the Company and  otherwise
without qualification except as therein noted, by KPMG Peat Marwick, have
been  prepared  in  accordance with GAAP consistently applied  except  as
therein  noted, are correct and complete and present fairly the financial
position  of the Company and its consolidated Subsidiaries at such  dates
and  the  results  of their operations and cash flows for  each  of  such
periods.   The unaudited consolidated balance sheets of the  Company  and
its  consolidated  Subsidiaries as of March 31, 1995, and  the  unaudited
statements of income and cash flows for the three-month period  ended  on
said  date prepared by the Company have been prepared in accordance  with
GAAP  consistently applied, are correct and complete and  present  fairly
the  financial position of the Company and its consolidated  Subsidiaries
as  of said date and their consolidated results of operations and changes
in their financial position or cash flows for such period, except that no
notes  are included in such interim financial statements and such interim
financial  statements are subject to normal recurring  adjustments  which
would be made in the course of an audit and which would not be material.

     (b)    Since  December 31, 1994, there has been  no  change  in  the
condition,  financial or otherwise, of the Company and  its  consolidated
Subsidiaries,  taken  as  a whole, as shown on the  consolidated  balance
sheet  as of such date except changes in the ordinary course of business,
none  of  which  individually  or in the aggregate  has  been  materially
adverse.
     
     The  Company notes that for the three months ended March  31,  1995,
total  cash  used in operating and investing activities was  $15,600,000.
While  the magnitude of such cash usage is material, such cash usage  has
not  had a material adverse effect on the properties, business prospects,
profits  or  condition (financial or otherwise) of the  Company  and  its
Subsidiaries, taken as a whole.

      5.   Indebtedness.  Schedule II attached to the Agreement correctly
describes  all  Funded Debt, Liens securing Funded Debt  and  Capitalized
Leases  of  the Company and its Subsidiaries outstanding on  the  Closing
Date.

      6.    Full  Disclosure.  The financial statements  referred  to  in
paragraph 4 hereof, the Agreement, the Memorandum and each other  written
statement  furnished  by  the  Company to  you  in  connection  with  the
negotiation of the sale of the Notes, taken collectively, do not  contain
any untrue statement of a material fact or omit a material fact necessary
to make the statements contained therein or herein not misleading.  There
is  no  fact  known  to any Responsible Officer to  the  Company  or  its
Subsidiaries which the Company has not disclosed to you in writing  which
materially affects adversely nor, so far as the Company can now  foresee,
will  materially  affect adversely the properties,  business,  prospects,
profits  or  condition (financial or otherwise) of the  Company  and  its
Subsidiaries, taken as a whole.

      7.    Pending Litigation.  There are no proceedings pending or,  to
the knowledge of the Company, threatened against or affecting the Company
or  any  Subsidiary in any court or before any governmental authority  or
arbitration  board  or tribunal in which there is  a  possibility  of  an
adverse  decision  which could reasonably be expected to  materially  and
adversely affect the properties, business, profits, results of operations
or   condition   (financial  or  otherwise)  of  the  Company   and   its
Subsidiaries, taken as a whole.

      8.   Title to Properties.  The Company and each Subsidiary has good
and  marketable  title in fee simple (or its equivalent under  applicable
law)  to all material parcels of real property and has good title to  all
the  other material items of property it purports to own, including  that
reflected  in  the most recent balance sheet referred to in  paragraph  4
hereof, except as sold or otherwise disposed of in the ordinary course of
business and except for Liens permitted by the Agreement.

      9.    Patents and Trademarks.  The Company and each Subsidiary owns
or  possesses  all the patents, trademarks, trade names,  service  marks,
copyrights,  trade  secrets, other intellectual  property,  licenses  and
rights  with  respect to the foregoing necessary for the conduct  of  its
business,  without  any known conflict with the rights  of  others  which
could  reasonably  be  expected to materially and  adversely  affect  the
Company's  and  its  Subsidiaries ability  to  conduct  their  respective
businesses.

     10.    Sale  Is  Legal and Authorized.  The sale of  the  Notes  and
compliance by the Company with all of the provisions of the Agreement and
the Notes_
     
         (a)   are within the corporate powers of the Company;
     
          (b)   will not violate any provisions of any applicable law  or
     any  order  of any court or governmental authority or agency  having
     jurisdiction  over  the  Company or  its  properties  and  will  not
     conflict  with  or  result  in  any breach  of  any  of  the  terms,
     conditions  or  provisions of, or constitute a  default  under,  the
     Certificate  of  Incorporation or By-laws  of  the  Company  or  any
     indenture or other agreement or instrument to which the Company is a
     party or by which it may be bound or result in the imposition of any
     Liens on any property or asset of the Company; and
     
          (c)    have been duly authorized by proper corporate action  on
     the  part  of  the  Company (no action by the  stockholders  of  the
     Company  being  required by law, by the Certificate of Incorporation
     or  By-laws of the Company or otherwise), executed and delivered  by
     the  Company and the Agreement and the Notes constitute  the  legal,
     valid  and  binding  obligations, contracts and  agreements  of  the
     Company enforceable in accordance with their respective terms.

     11.   No Defaults.  No Default or Event of Default has occurred  and
is continuing.  The Company is not in default in the payment of principal
or  interest on any Indebtedness for borrowed money and is not in default
under  any  instrument or instruments or agreements under and subject  to
which  any Indebtedness for borrowed money has been issued and  no  event
has  occurred  and  is  continuing  under  the  provisions  of  any  such
instrument  or  agreement which with the lapse of time or the  giving  of
notice, or both, would constitute an event of default thereunder.

     12.   Governmental Consent.  No approval, consent or withholding  of
objection on the part of any regulatory body, state, Federal or local, is
necessary in connection with the execution and delivery by the Company of
the  Agreement  or  the  issuance, sale  or  delivery  of  the  Notes  or
compliance by the Company with any of the provisions of the Agreement  or
the Notes.

     13.   Taxes.  All United States Federal income tax returns and other
material  tax  returns  required  to be  filed  by  the  Company  or  any
Subsidiary in any jurisdiction have, in fact, been filed, and all  taxes,
assessments, fees and other governmental charges upon the Company or  any
Subsidiary  or  upon  any  of  their  respective  properties,  income  or
franchises,  which are shown to be due and payable in such  returns  have
been  paid.  For all taxable years ending on or before December 31, 1990,
the  Federal income tax liability of the Company and its Subsidiaries has
been  satisfied  and  (a)  the  period of limitations  on  assessment  of
additional  Federal  income tax has expired,  (b)  the  Company  and  its
Subsidiaries  have  entered into an agreement with the  Internal  Revenue
Service closing conclusively the total tax liability for the taxable year
or  (c)  the  Company is carrying forward a net operating loss  from  the
taxable  year.  The Company does not know of any proposed additional  tax
assessment against it for which adequate provision has not been  made  on
its  accounts,  and  no  material controversy in  respect  of  additional
Federal  or state income taxes due since said date is pending or  to  the
knowledge  of  the Company threatened.  The provisions for taxes  on  the
books of the Company and each Subsidiary are in the reasonable opinion of
the  Chief Financial Officer of the Company adequate for all open  years,
and for its current fiscal period.

     14.    Use of Proceeds.  The net proceeds from the sale of the Notes
will  be  used  to  repay borrowing under the Bank Credit  Agreement  for
capital  expenditures,  and for other corporate purposes.   None  of  the
transactions contemplated in the Agreement (including, without limitation
thereof, the use of proceeds from the issuance of the Notes) will violate
or  result in a violation of Section 7 of the Securities Exchange Act  of
1934,  as  amended, or any regulation issued pursuant thereto, including,
without  limitation, Regulations G, T and X of the Board of Governors  of
the  Federal Reserve System, 12 C.F.R., Chapter II.  Neither the  Company
nor  any  Subsidiary  owns or intends to carry or  purchase  any  "margin
stock"  within  the meaning of said Regulation G.  None of  the  proceeds
from  the  sale  of the Notes will be used to purchase, or refinance  any
borrowing  the  proceeds of which were used to purchase,  any  "security"
within the meaning of the Securities Exchange Act of 1934, as amended.

    15.   Private Offering.  Neither the Company, directly or indirectly,
nor  any agent on its behalf has offered or will offer the Notes  or  any
similar  Security to or has solicited or will solicit an offer to acquire
the  Notes  or  any similar Security from or has otherwise approached  or
negotiated or will approach or negotiate in respect of the Notes  or  any
similar  Security with any Person other than the Purchaser and  not  more
than  fifty  other institutional investors, each of whom  was  offered  a
portion  of  the  Notes  at  private sale for  investment.   Neither  the
Company, directly or indirectly, nor any agent on its behalf has  offered
or  will  offer the Notes or any similar Security to or has solicited  or
will  solicit an offer to acquire the Notes or any similar Security  from
any  Person so as to bring the issuance and sale of the Notes within  the
provisions of Section 5 of the Securities Act of 1933, as amended.

     16.   ERISA.  Assuming the accuracy of the representations set forth
in  3.2(b)  of  the  Agreement,  the  consummation  of  the  transactions
provided  for  in  the Agreement and compliance by the Company  with  the
provisions  thereof and the Notes issued thereunder will not involve  any
prohibited transaction within the meaning of ERISA or Section 4975 of the
Code.   Each  Plan complies in all material respects with all  applicable
statutes  and  governmental rules and regulations, and (a) no  Reportable
Event  has  occurred  and is continuing with respect  to  any  Plan,  (b)
neither  the  Company  nor any ERISA Affiliate  has  withdrawn  from  any
Multiemployer  Plan or instituted steps to do so, and (c) no  steps  have
been  instituted  to terminate any Plan pursuant to Sections  4041(c)  or
4042  of ERISA.  No condition exists or event or transaction has occurred
in  connection with any Plan which could result in the incurrence by  the
Company  or  any  ERISA  Affiliate of any  material  liability,  fine  or
penalty.   No Plan maintained by the Company or any ERISA Affiliate,  nor
any  trust  created  thereunder, has incurred  any  "accumulated  funding
deficiency" as defined in Section 302 of ERISA nor does the present value
of  all  benefits  vested under all Plans exceed, as of the  last  annual
valuation  date, the value of the assets of the Plans allocable  to  such
vested  benefits.   Neither the Company nor any ERISA Affiliate  has  any
contingent liability with respect to any post-retirement "welfare benefit
plan" (as such term is defined in ERISA) except as has been disclosed  to
the Purchaser.

     17.    Compliance  with  Law.   (a)  Neither  the  Company  nor  any
Subsidiary  (1)  is  in  violation  of  any  law,  ordinance,  franchise,
governmental rule or regulation to which it is subject; or (2) has failed
to   obtain   any  license,  permit,  franchise  or  other   governmental
authorization  necessary  to the ownership of  its  property  or  to  the
conduct  of  its  business, which violation or failure  to  obtain  would
materially affect adversely the business, profits, properties, results of
operation  or condition (financial or otherwise) of the Company  and  its
Subsidiaries, taken as a whole, or impair the ability of the  Company  to
perform its obligations contained in the Agreement or the Notes.  Neither
the Company nor any Subsidiary is in default with respect to any order of
any  court  or  governmental authority or arbitration board  or  tribunal
having jurisdiction over the Company or any Subsidiary.

    (b)   Without limiting the provisions of clause (a) of this paragraph
17,  the Company is in compliance with all applicable Environmental Laws,
the  failure  to comply with which would materially affect adversely  the
properties,  business,  profits,  properties,  results  of  operation  or
condition  (financial or otherwise) of the Company and  its  Subsidiaries
taken as a whole or the ability of the Company to perform its obligations
under the Agreement or the Notes.

     18.    Investment  Company Act.  The Company  is  not,  and  is  not
directly  or indirectly controlled by or acting on behalf of  any  Person
which  is,  required  to register as an "investment  company"  under  the
Investment Company Act of 1940, as amended.

     19.    Foreign Assets Control Regulations, etc.  Neither the Company
nor any Affiliate of the Company is, by reason of being a "national" of a
"designated foreign country" or a "specially designated national"  within
the  meaning of the Regulations of the Office of Foreign Assets  Control,
United States Treasury Department (31 C.F.R., Subtitle B, Chapter V),  or
for any other reason, subject to any restriction or prohibition under, or
is  in violation of, any Federal statute or Presidential Executive Order,
or  any  rules or regulations of any department, agency or administrative
body  promulgated  under any such statute or order, concerning  trade  or
other  relations  with  any foreign country or any  citizen  or  national
thereof or the ownership or operation of any property.







                  ORBITAL SCIENCES CORPORATION
                     1990 STOCK OPTION PLAN

              (Restated Effective April 27, 1995)


                           ARTICLE I
                        PURPOSE OF PLAN

           The  purpose  of  this 1990 Stock Option  Plan  is  to
promote   the  growth  and  profitability  of  Orbital   Sciences
Corporation  by  providing,  through  the  ownership  of  Shares,
incentives  to  attract  and retain highly  talented  persons  to
provide managerial and administrative services to the Company and
other Participating Companies and to motivate such persons to use
their   best   effort  on  behalf  of  the  Company   and   other
Participating Companies.


                           ARTICLE II
                          DEFINITIONS

           For  the  purposes of this Plan, the  following  terms
shall have the meanings set forth in this Article II:

      2.01   Accrued Installment.  The term "Accrued Installment"
shall mean any vested installment of an Option.

      2.02   Board.   The term "Board" shall mean  the  Board  of
Directors of the Company.

       2.03   Committee.   The  term  "Committee"  shall  mean  a
committee  appointed by the Board pursuant to  Section  3.04  and
constituting not less than three (3) members of the Board.

      2.04   Company.   The  term "Company"  shall  mean  Orbital
Sciences  Corporation, a Delaware corporation, or  any  successor
thereof.

      2.05  Director.  The term "Director" shall mean a member of
the  Board,  or  a  member  of  the board  of  directors  of  any
Participating Company.

     2.06  Disinterested Person.  The term "Disinterested Person"
shall  mean  any person defined as a disinterested  person  under
Rule   16b-3  of  the  Securities  and  Exchange  Commission   as
promulgated under the Exchange Act.

      2.07  Effective Date.  The term "Effective Date" shall mean
November 9, 1987.

      2.08   Eligible Person.  The term "Eligible  Person"  shall
mean  any  employee of any Participating Company, but  shall  not
include any Director of any Participating Company who is not also
an employee or officer of a Participating Company.

      2.09  Exchange Act.  The term "Exchange Act" shall mean the
Securities Exchange Act of 1934, as amended.

     2.10  Fair Market Value.  The term "Fair Market Value," when
used  with  respect to the determination of the option  price  of
Options,  shall  mean the closing sale price  of  Shares  on  the
national securities exchange on which Shares are then principally
traded  or,  if  that  measure of price is not  available,  on  a
composite index of such exchanges or, if that measure of price is
not  available, in a national market system for securities on the
date of the grant of the Option.  In the event that there are  no
sales  of Shares on any such exchange or market on such  date  of
the  grant of the Option, the fair market value of Shares on  the
date  of the grant shall be deemed to be the closing sales  price
on  the next preceding day on which Shares were sold on any  such
exchange or market.  In the event that such Shares are not listed
on  any such market or exchange on such date of the grant of  the
Option,  a reasonable valuation of the fair market value  of  the
Shares on the date of the grant shall be made by the Board.

      2.11   I.R.C.   The term "I.R.C." shall mean  the  Internal
Revenue Code of 1986, as it may be amended from time to time.

      2.12   Incentive  Stock Option.  The term "Incentive  Stock
Option"   shall   mean  any  Option  intended  to   satisfy   the
requirements  under I.R.C. Section 422(b) as an  incentive  stock
option.

      2.13   Nonstatutory  Stock Option.  The term  "Nonstatutory
Stock  Option" shall mean any Option granted under the Plan  that
does not qualify as an Incentive Stock Option.

      2.14   Option.  The term "Option" shall mean an  option  to
acquire Shares granted under the Plan.

      2.15  Optionee.  The term "Optionee" shall mean an Eligible
Person who has been granted Options.

     2.16  ORBCOMM Partnerships.  The term "ORBCOMM Partnerships"
shall  mean  ORBCOMM  Development Partners,  L.P.,  ORBCOMM  U.S.
Partners,  L.P.,  ORBCOMM International Partners,  L.P.  and  any
successor partnerships thereto; provided, however, that the  term
"ORBCOMM  Partnership" shall not include any partnership  at  any
time   when   the   Company   holds,  directly   or   indirectly,
Participation   Percentages  (as  defined   in   the   applicable
partnership agreement) in such partnership aggregating less  than
20%.

      2.17   Parent  Corporation.  The term "Parent  Corporation"
shall mean a corporation as defined in I.R.C. Section 425(e).

       2.18   Participating  Company.   The  term  "Participating
Company" shall mean the Company and, any Parent Corporation or of
the  Company,  any Subsidiary Corporation of the Company  or  its
Parent Corporation and any ORBCOMM Partnership.

     2.19  Plan.  The term "Plan" shall refer to the Stock Option
Plan  of  the  Company  set forth herein that  provides  for  the
granting  of  Incentive  Stock  Options  and  Nonstatutory  Stock
Options.

       2.20    Restricted  Shareholder.   The  term   "Restricted
Shareholder"  shall mean an Optionee granted an  Incentive  Stock
Option  who,  at the time the Incentive Stock Option is  granted,
owns  stock possessing more than ten percent (10%) of  the  total
combined  voting  power of all classes of stock of  the  Company,
with   stock   ownership  determined  in  accordance   with   the
attribution rules of I.R.C. Section 425(d).

      2.21   Shares.  The term "Shares" shall mean shares of  the
Company's  authorized Common Stock, $.01 par value,  and  may  be
unissued  shares  or  treasury shares  or  shares  purchased  for
purposes of the Plan.

       2.22    Subsidiary  Corporation.   The  term   "Subsidiary
Corporation"  shall  mean  a corporation  as  defined  in  I.R.C.
Section 425(f).

       2.23   Terminating  Transaction.   The  term  "Terminating
Transaction"  shall mean any of the following  events:   (a)  the
dissolution  or liquidation of the Company; (b) a reorganization,
merger  or  consolidation of the Company with one or  more  other
corporations  as  a  result of which  the  Company  goes  out  of
existence  or  becomes a subsidiary of another corporation  other
than  a  corporation that was a Participating Company immediately
prior  to  such event (which shall be deemed to have occurred  if
another  corporation  shall own, directly or  indirectly,  eighty
percent  (80%)  or  more of the aggregate  voting  power  of  all
outstanding  equity securities of the Company);  (c)  a  sale  of
substantially all of the Company's assets to a person or  persons
other  than  a  corporation  that  was  a  Participating  Company
immediately prior to such event; or (d) a sale to one person  (or
two  or  more persons acting in concert) of equity securities  of
the  Company  representing eighty percent (80%) or  more  of  the
aggregate  voting power of all outstanding equity  securities  of
the  Company.  As used herein or elsewhere in this Plan, the word
"person"  shall  mean  an  individual, corporation,  partnership,
association  or other person or entity, or any group  of  two  or
more of the foregoing that have agreed to act together.

      2.24   Termination Date.  The term "Termination Date" shall
mean November 9, 1997.

      2.25   Total Disability.  The term "Total Disability" shall
mean a total and permanent disability as that term is defined  in
I.R.C. Section 22(e)(3).


                          ARTICLE III
                     ADMINISTRATION OF PLAN

       3.01    Administration  by  Board.   The  Plan  shall   be
administered  by  the  Board.  The  Board  shall  have  full  and
absolute   power  and  authority  in  its  sole   discretion   to
(a)  determine  which  Eligible Persons  shall  receive  Options;
(b)   determine   the  time  when  Options  shall   be   granted;
(c) determine the terms and conditions, not inconsistent with the
provisions   of  the  Plan,  of  any  Option  granted  hereunder,
including whether such Option is an Incentive Stock Option  or  a
Nonstatutory  Stock Option (except that Incentive  Stock  Options
may not be granted to any Eligible Person that is not an employee
or  officer of the Company, any Parent Corporation of the Company
or  any  Subsidiary  Corporation of the  Company  or  its  Parent
Corporation);  (d) determine the number of Shares  which  may  be
issued  upon  exercise  of the Options;  and  (e)  interpret  the
provisions  of  this  Plan and of any Option granted  under  this
Plan.

     3.02  Rules and Regulations.  The Board may adopt such rules
and regulations as the Board may deem necessary or appropriate to
carry out the purposes of the Plan and shall have authority to do
everything necessary or appropriate to administer the Plan.

      3.03   Binding  Authority.  All decisions,  determinations,
interpretations  or other actions by the Board  shall  be  final,
conclusive  and  binding  on  all  Eligible  Persons,  Optionees,
Participating  Companies and any successors-in-interest  to  such
parties.

     3.04  Administration by Committee.

            (a) The Board, in its sole discretion, may, from time
to  time, appoint a Committee to administer the Plan and exercise
all  of  the powers, authority and discretion of the Board  under
the  Plan,  other  than  the power and  authority  to  amend  and
terminate the Plan under Section 7.01.

            (b) In establishing the Committee, each member of the
Committee must be a Disinterested Person, and the Board may,  but
is  not  required  to,  take such other  actions  as  are  deemed
necessary or advisable to conform the Plan to the requirements of
Rule 16b-3 as promulgated under the Exchange Act.

            (c)  The Committee, in its sole discretion, may, from
time  to  time, delegate to the Chairman, the President  and  the
Chief  Executive Officer, or any of them, while any such  officer
is  a  member of the Board, authority to grant Options under  the
Plan  to  Eligible Persons who are not officers  of  the  Company
within  the  meaning  of  Rule  16a1-(f)  promulgated  under  the
Exchange  Act.   Such  authority  shall  be  on  such  terms  and
conditions,  and  subject to such limitations, as  the  Committee
shall  specify  in its delegation of authority.   Except  to  the
extent  otherwise specified by the Committee in such  delegation,
the  delegated authority to grant Options shall include the  full
and  absolute  power  in  his or their  sole  discretion  to  (a)
determine  which of such Eligible Persons shall receive  Options,
(b)  determine the time when such Options shall be  granted,  (c)
determine  the  terms and conditions (including  the  amount  and
manner  of payment of the exercise price), not inconsistent  with
the  provisions of the Plan, of any such Option granted  pursuant
to  such  delegated authority, and (d) determine  the  number  of
Shares  that may be issued upon exercise of such Options.  Except
to  the  extent  otherwise specified by  the  Committee  in  such
delegation,  the authority so delegated shall be in addition  to,
and  not  in  lieu  of, the authority of the Committee  to  grant
options  to Eligible Persons, including Eligible Persons who  are
not officers within the meaning of such Rule 16a-1(f).

           (d) The Committee, the Chairman, the President and the
Chief  Executive Officer shall report to the Board the  names  of
Eligible  Persons  granted  Options  by  the  Committee  or  such
officer, as the case may be, the number of Shares covered by each
Option, and the terms and conditions of each such Option.


                           ARTICLE IV
              NUMBER OF SHARES AVAILABLE FOR GRANT

             Subject   to  the  following  provisions   of   this
Article IV, the maximum aggregate number of Shares which  may  be
optioned and sold under the Plan is 2,975,000.  In the event that
Options  granted under the Plan shall, for any reason, terminate,
lapse, be forfeited or expire without being exercised, the Shares
subject to such unexercised Options shall again be available  for
the granting of Options under the Plan.  In the event that Shares
that  were previously issued by the Company, upon exercise of  an
Option,   are   reacquired  by  the  Company  as  part   of   the
consideration  received  (in  accordance  with  Section   6.05(b)
hereof)   upon  the  subsequent  exercise  of  an  Option,   such
reacquired  Shares shall again be available for the  granting  of
Options  hereunder.  Notwithstanding any other provision  of  the
Plan,  no  Eligible Person may be granted in any two-year  period
Options to acquire more than 70,000 Shares except that Options to
acquire  up  to  an additional 50,000 Shares may  be  granted  in
connection  with  an  Eligible  Person's  initial  hiring  as  an
employee  of a Participating Company or in connection  with  such
Eligible Person's employer becoming a Participating Company.


                           ARTICLE V
                          TERM OF PLAN

            The  Plan shall be effective as of the Effective Date
and  shall terminate on the Termination Date.  No Option  may  be
granted hereunder after the Termination Date.


                           ARTICLE VI
                          OPTION TERMS

      6.01   Form of Option Agreement.  Any Option granted  under
the  Plan shall be evidenced by an agreement ("Option Agreement")
in  such form as the Board, in its discretion, may, from time  to
time, approve.  Any Option Agreement shall contain such terms and
conditions  as  the Board may deem necessary or  appropriate  and
which are not inconsistent with the provisions of the Plan.

      6.02  Option Exercise Price.  The option exercise price for
Shares  to  be issued under the Plan shall be determined  by  the
Board  in  its sole discretion, but in no event shall the  option
exercise  price be less than the Fair Market Value of the  Shares
in  the  case of an Incentive Stock Option, or less than  eighty-
five  percent  (85%) of the Fair Market Value in the  case  of  a
Nonstatutory Stock Option.

      6.03   Vesting  and Exercise of Options.   Subject  to  the
limitations  set  forth  herein and/or in any  applicable  Option
Agreement entered into hereunder, Options granted under the  Plan
shall  vest and be exercisable in accordance with the  rules  set
forth in this Section 6.03:

            (a) General.  Subject to the other provisions of this
Section  6.03, Options shall vest and become exercisable at  such
time  and in such installments as the Board shall provide in each
individual Option Agreement.  Notwithstanding the foregoing,  the
Board  may, in its sole discretion, accelerate the time at  which
an  Option  or  installment  thereof may  be  exercised.   Unless
otherwise  provided  in  this  Section  6.03  or  in  the  Option
Agreement  pursuant to which an Option is granted, an Option  may
be exercised when Accrued Installments accrue as provided in such
Option Agreement and at any time thereafter until, and including,
the day before the Option Termination Date.

            (b)  Termination of Options.  All installments of  an
Option shall expire and terminate on such date as the Board shall
determine ("Option Termination Date"), which in no event shall be
later  than ten (10) years from the date such Option was  granted
and,  in  the  case  of an Incentive Stock Option  granted  to  a
Restricted  Shareholder, the Option shall, by its terms,  not  be
exercisable after the expiration of five (5) years from the  date
such Option was granted.

            (c)  Termination of Employment or Directorship  other
than  by  Death  or  Total Disability.  In  the  event  that  the
employment  of  an  Optionee  with  a  Participating  Company  is
terminated for any reason (other than death or Total Disability),
any  installments under an Option held by such Optionee that have
not  accrued  as of the employment termination date shall  expire
and  become unexercisable as of the employment termination  date.
In  the event that an Optionee who is a Director ceases to  be  a
Director  for  any reason (other than death or Total Disability),
any  installments under an Option held by such Optionee that have
not  accrued as of the directorship termination date shall expire
and become unexercisable as of the directorship termination date.
All Accrued Installments as of the employment termination date or
the  directorship termination date (whichever may be  applicable)
shall  expire  and  become unexercisable as  of  the  earlier  of
(i)  three  (3)  months following the employment or  directorship
termination  date; or (ii) the original Option Termination  Date.
For  purposes  of the Plan, an Optionee who is an employee  or  a
Director of any Participating Company shall not be deemed to have
incurred  a termination of his or her employment or a termination
of  his or her directorship (whichever may be applicable) so long
as  such  Optionee is an employee or Director (whichever  may  be
applicable) of any Participating Company.

            (d)  Leave of Absence.  An approved leave of  absence
shall  not constitute a termination of employment under the Plan.
An  approved  leave  of absence shall mean  an  absence  approved
pursuant  to  the policy of a Participating Company for  military
leave, sick leave, or other bona fide leave, not to exceed ninety
(90)  days  or,  if  longer, as long as the employee's  right  to
re-employment is guaranteed by contract, statute or the policy of
a  Participating Company.  Notwithstanding the foregoing,  in  no
event  shall  an  approved leave of absence operate  to  make  an
Option exercisable after the original Option Termination Date.

            (e)  Death  or  Total Disability  of  Optionee  while
Employed.   In  the event that the employment and/or directorship
of  an  Optionee  with a Participating Company is  terminated  by
reason  of  death  or  Total Disability, any unexercised  Accrued
Installments of Options granted hereunder to such Optionee  shall
expire and become unexercisable as of the earlier of:

                (i) The applicable Option Termination Date; or

                 (ii)  The  first  anniversary  of  the  date  of
     termination  of  employment  and/or  directorship  of   such
     Optionee  by  reason  of  the  Optionee's  death  or   Total
     Disability.

            Any  such Accrued Installments of a deceased Optionee
may be exercised prior to their expiration only by the person  or
persons to whom the Optionee's Option rights pass by will or  the
laws  of descent and distribution.  Any Option installments under
such  a  deceased  or disabled Optionee's Option  that  have  not
accrued  as  of  the  date  of  the  employee's  termination   of
employment and/or Director's termination of directorship  due  to
death  or  Total Disability shall expire and become unexercisable
as of the employment and/or directorship termination date.

             (f)  Termination  of  Affiliation  of  Participating
Company.   Notwithstanding  the  foregoing  provisions  of   this
Section  6.03, (i) in the case of an Optionee who is an  employee
or  Director  of a Participating Company other than the  Company,
upon  an  Affiliation  Termination (as defined  herein)  of  such
Participating  Company, such Optionee shall be  deemed  (for  all
purposes  of the Plan) to have incurred a termination of  his  or
her  employment or directorship (whichever may be applicable) for
reasons   other  than  death  or  Total  Disability,  with   such
termination  to be deemed effective as of the effective  date  of
said  Affiliation Termination and (ii) in the case of an Optionee
who is an employee or officer of a Participating Company that  is
an  ORBCOMM Partnership, upon an Affiliation Termination of  such
Participating Company, all unaccrued installments of  any  Option
held  by such Optionee shall vest and become Accrued Installments
immediately  prior  to  the  effectiveness  of  such  Affiliation
Termination  and  thereafter each such Option  shall  expire  and
become  unexercisable  as of the earlier of  (A)  the  applicable
Option  Termination  Date,  (B)  the  first  anniversary  of  the
Optionee's  death  or Total Disability or (C)  three  (3)  months
following  the  date the Optionee ceases to be  employed  by  any
Participating  Company  or  any  ORBCOMM  Partnership.   As  used
herein,  the  term  "Affiliation Termination"  shall  mean,  with
respect  to  a  Participating Company, the  termination  of  such
Participating Company's status as an ORBCOMM Partnership or as  a
Parent Corporation of the Company or a Subsidiary Corporation  of
the Company or its Parent Corporation.

      6.04   Exercise of Options.  An Option may be exercised  in
accordance with this Section 6.04 as to all or any portion of the
Shares covered by an Accrued Installment of the Option, from time
to  time  during  the applicable option period,  except  that  an
Option  shall not be exercisable with respect to fractions  of  a
Share.   Options may be exercised, in whole or in part, by giving
written  notice  of exercise to the Company, which  notice  shall
specify  the  number  of  Shares to be  purchased  and  shall  be
accompanied  by  payment  in  full  of  the  purchase  price   in
accordance  with  Section  6.05.   An  Option  shall  be   deemed
exercised when such written notice of exercise has been  received
by the Company.  No Shares shall be issued until full payment has
been made and the Optionee has satisfied such other conditions as
may  be  required by the Plan; as may be required  by  applicable
laws,  rules or regulations; or as may be adopted or  imposed  by
the Board.  Until the issuance of stock certificates, no right to
vote  or  receive dividends or any other rights as a  stockholder
shall  exist with respect to optioned Shares notwithstanding  the
exercise  of  the  Option.  No adjustment  will  be  made  for  a
dividend  or other rights for which the record date is  prior  to
the  date the stock certificate is issued, except as provided  in
Section 6.08(a).

     6.05  Payment of Option Exercise Price.

            (a)  Except as otherwise provided in Section 6.05(b),
the  entire option exercise price shall be paid at the  time  the
Option  is  exercised by cashier's check or such other  means  as
deemed acceptable by the Company.

            (b)  In the discretion of the Board, an Optionee  may
elect to pay for all or some of the Optionee's Shares with Shares
to  which the Optionee has a right at the time of the exercise by
the Optionee, including Shares to which the Optionee has obtained
a  right  by  previous exercise, subject to all restrictions  and
limitations of applicable laws, rules and regulations and subject
to  the  satisfaction  of any conditions the  Board  may  impose,
including, but not limited to, the making of such representations
and  warranties  and the providing of such other assurances  that
the Board may require with respect to the Optionee's title to the
Shares  used  for  payment of the exercise price.   Such  payment
shall  be  made by delivery of certificates representing  Shares,
duly  endorsed  or  with duly signed stock power  attached,  such
Shares to be valued at the last reported sale price of the Shares
on  a  public exchange on the day immediately preceding  the  day
notice  of exercise is received by the Company or, if such Shares
are  not then listed on such stock exchange, on such basis as the
Board shall determine.

      6.06  Options Not Transferable.  Options granted under this
Plan   may   not   be  sold,  pledged,  hypothecated,   assigned,
encumbered, gifted or otherwise transferred or alienated  in  any
manner, either voluntarily or involuntarily by operation of  law,
other  than by will or the laws of descent and distribution,  and
may  be exercised during the lifetime of an Optionee only by such
Optionee.

     6.07  Restrictions on Issuance of Shares.

            (a)  No  Shares  shall be issued  or  delivered  upon
exercise  of  an  Option unless and until there shall  have  been
compliance with all applicable requirements of the Securities Act
of  1933, as amended, all applicable listing requirements of  any
national securities exchange on which Shares are then listed, and
any  other  requirement of law or of any regulatory  body  having
jurisdiction  over such issuance and delivery.  The inability  of
the  Company  to  obtain any required permits, authorizations  or
approvals  necessary  for the lawful issuance  and  sale  of  any
Shares  hereunder on terms deemed reasonable by the  Board  shall
relieve the Company, the Board and any Committee of any liability
in respect of the non-issuance or sale of such Shares as to which
such  requisite  permits, authorizations or approvals  shall  not
have been obtained.

            (b) As a condition to the granting or exercise of any
Option,  the Board may require the person receiving or exercising
such  Option  to make any representation and/or warranty  to  the
Company  as  may  be  required  under  any  applicable   law   or
regulation, including, but not limited to, a representation  that
the  Option  and/or Shares are being acquired only for investment
and  without  any  present intention to sell or  distribute  such
Option and/or Shares, if such a representation is required  under
the  Securities Act of 1933, as amended, or any other  applicable
law, rule or regulation.

            (c)  The  exercise  of  Options  under  the  Plan  is
conditioned  on  approval of the Plan  by  the  vote  or  written
consent of a majority of the holders of outstanding Shares of the
Company's Common Stock represented and voting at a meeting within
twelve  (12)  months of the adoption of the Plan.  In  the  event
such  stockholder  approval  is not  obtained  within  such  time
period, any Options granted hereunder shall be void.

     6.08  Option Adjustments.

            (a) If the outstanding Shares of Common Stock of  the
Company are increased, decreased, changed into or exchanged for a
different  number  or  kind  of shares  of  the  Company  through
reorganization,    recapitalization,   reclassification,    stock
dividend,  stock split or reverse stock split, upon authorization
of  the  Board, a proportionate adjustment shall be made  in  the
number  or kind of shares and the per share option price thereof,
which  may be issued in the aggregate and to individual Optionees
upon  exercise  of  Options  granted under  the  Plan;  provided,
however, that no such adjustment need be made if, upon the advice
of  counsel, the Board determines that such adjustment may result
in  the receipt of federally taxable income to holders of Options
granted hereunder or the holders of Common Stock or other classes
of the Company's securities.

            (b) Upon the occurrence of a Terminating Transaction,
as  of  the  effective date of such Terminating Transaction,  the
Plan  and  any then outstanding Options (whether or  not  vested)
shall  terminate  unless (i) provision  is  made  in  writing  in
connection with such transaction for the continuance of the  Plan
and  for  the assumption of such Options, or for the substitution
for  such Options of new options covering the securities  of  any
successor  or survivor corporation in the Terminating Transaction
or an affiliate thereof, with such adjustments as the Board deems
appropriate with respect to the number and kind of securities and
the  per share exercise price under such substituted options,  in
which  event the Plan and such outstanding Options shall continue
or  be replaced, as the case may be, in the manner and under  the
terms  so provided; or (ii) the Board otherwise shall provide  in
writing for such adjustments as it deems appropriate in the terms
and  conditions of the then outstanding Options (whether  or  not
vested),  including,  without limitation,  (A)  accelerating  the
vesting  of  outstanding Options; and/or (B)  providing  for  the
cancellation of Options and their automatic conversion  into  the
right to receive the securities or other properties that a holder
of  Shares  underlying such Options would have been  entitled  to
receive upon the consummation of such Terminating Transaction had
such  Shares  been issued and outstanding (net of the appropriate
option   exercise  prices).   If,  pursuant  to   the   foregoing
provisions of this paragraph (b), the Plan and the Options  shall
terminate   by   reason  of  the  occurrence  of  a   Terminating
Transaction without provision for any of the action(s)  described
in  clause  (i)  and/or  (ii) hereof, then any  Optionee  holding
outstanding   Options  shall  have  the  right,  at   such   time
immediately   prior  to  the  consummation  of  the   Terminating
Transaction  as  the  Board shall designate,  to  exercise  their
Options  to the full extent not theretofore exercised,  including
any installments that have not yet become Accrued Installments.

            (c)  Except to the extent required in order to retain
the qualification of an Option as an Incentive Stock Option under
I.R.C.   Section  422,  to  the  maximum  extent  possible,   any
adjustments  authorized under this Section 6.08 with  respect  to
any  outstanding  Options shall be made by means  of  appropriate
adjustments to the number of Shares (or other securities) and the
option exercise price therefor under the unexercised portions  of
such  outstanding  Options, but without  changing  the  aggregate
exercise price applicable to said unexercised portions.   In  all
cases,  the  nature and extent of adjustments under this  Section
6.08 shall be determined by the Board in its sole discretion, and
any  such determination as to what adjustments shall be made, and
the  extent  thereof, shall be final and binding.  No  fractional
shares  of stock shall be issued under the Plan pursuant  to  any
such adjustment.

      6.09  Taxes.  The Board shall make such provisions and take
such  steps  as  it  deems  necessary  or  appropriate  for   the
withholding  of any federal, state, local and other tax  required
by law to be withheld with respect to the grant or exercise of an
Option  under  the  Plan, or with respect to the  disposition  of
Shares acquired pursuant to the exercise of an Option pursuant to
the Plan, including, but without limitation, the deduction of the
amount of any such withholding tax from any compensation or other
amounts payable to an Optionee by any member of the Participating
Companies,   or   requiring  an  Optionee  (or   the   Optionee's
beneficiary or legal representative), as a condition of  granting
or   exercising  an  Option,  to  pay  to  any  member   of   the
Participating Companies any amount required to be withheld, or to
execute  such  other  documents as the Board deems  necessary  or
desirable  in connection with the satisfaction of any  applicable
withholding obligation.

      6.10   Legends  on  Options and Stock  Certificates.   Each
Option   Agreement  and  each  certificate  representing   Shares
acquired  upon exercise of an Option shall be endorsed  with  all
legends,  if  any,  required  by  applicable  federal  and  state
securities  laws to be placed on the Option Agreement and/or  the
certificate.  The determination of which legends, if  any,  shall
be  placed upon Stock Option Agreements and/or said Shares  shall
be  made  by the Board in its sole discretion, and such  decision
shall be final and binding.



                          ARTICLE VII
                AMENDMENT OR TERMINATION OF PLAN

      7.01   Board Authority.  The Board may amend, alter  and/or
terminate the Plan at any time; provided, however, that no change
shall  be  effective unless approved by the stockholders  of  the
Company  if  such change would cause the Option Plan to  fail  to
meet  the  qualification requirements for Incentive Stock  Option
Plans as set forth in the I.R.C. or to comply with Rule 16b-3  of
the  Exchange  Act or any successor rule under  such  Act  as  in
effect on the date of such amendment.

      7.02   Limitation on Board Authority.  The Board may  amend
the  terms  of  any  Option previously granted, prospectively  or
retroactively,  and  may amend the Plan in  accordance  with  the
provisions  of  Section  7.01;  provided,  however,  that  unless
required  by applicable law, rule or regulation, no amendment  of
the  Plan  or of any Option Agreement shall affect, in a material
and adverse manner, Options granted prior to the date of any such
amendment  without the consent of any Optionee holding  any  such
affected Options.

      7.03   Substitution of Options.  In the Board's discretion,
the   Board   may,   with   an  Optionee's  consent,   substitute
Nonstatutory  Stock  Options  for  outstanding  Incentive   Stock
Options,  and  any such substitution shall not constitute  a  new
Option  grant for the purposes of the Plan, and shall not require
a  revaluation  of the Option exercise price for the  substituted
Option.  Any such substitution may be implemented by an amendment
to the applicable Option Agreement or in such other manner as the
Board in its discretion may determine.


                          ARTICLE VIII
                       GENERAL PROVISIONS

     8.01  Availability of the Plan.  A copy of the Plan shall be
delivered to the Secretary of the Company and shall be  shown  by
the  Secretary  to any Eligible Person making reasonable  inquiry
concerning the Plan.

     8.02  Notice.  Any notice or other communication required or
permitted  to be given pursuant to the Plan or under  any  Option
Agreement  must be in writing and may be given by  registered  or
certified  mail  and, if given by registered or  certified  mail,
shall  be  determined  to have been given  and  received  when  a
registered  or certified letter containing such notice,  properly
addressed with postage prepaid, is deposited in the United States
mails  and,  if given otherwise than by registered  or  certified
mail,  shall be deemed to have been given when delivered  to  and
received  by the party to whom addressed.  Notice shall be  given
to  Eligible Persons at their most recent addresses shown in  the
Company's  records.  Notice to the Company shall be addressed  to
the  Company at the address of the Company's principal  executive
offices, to the attention of the Secretary of the Company.

      8.03  Titles and Headings.  Titles and headings of sections
of  the Plan are for convenience of reference only and shall  not
affect the construction of any provision of the Plan.

      8.04   Governing  Law.   The Plan  shall  be  governed  by,
interpreted  under and construed and enforced in accordance  with
the  internal  laws, and not the laws pertaining to conflicts  or
choice  of  laws,  of  the  State  of  Delaware,  applicable   to
agreements  made and to be performed wholly within the  State  of
Delaware.


LEGAL\OPTPLAN






                  ORBITAL SCIENCES CORPORATION
       1990 STOCK OPTION PLAN FOR NON-EMPLOYEE DIRECTORS


                           ARTICLE I
                        PURPOSE OF PLAN

           The  purpose  of  this  1990  Stock  Option  Plan  for
Non-Employee Directors is to promote the growth and profitability
of   Orbital  Sciences  Corporation  by  providing,  through  the
ownership  of  Shares,  incentives to  attract  and  retain  non-
employee  directors  who are in a position  to  make  significant
contributions   to   the  success  of  the  Company   and   other
Participating  Companies and to reward such  directors  for  such
contributions.


                           ARTICLE II
                          DEFINITIONS

          For the purposes of the Plan, the following terms shall
have the meanings set forth in this Article II:

      2.01   Board.   The term "Board" shall mean  the  Board  of
Directors of the Company.

       2.02   Committee.   The  term  "Committee"  shall  mean  a
committee  appointed by the Board pursuant to  Section  3.04  and
constituting not less than three (3) members of the Board.

      2.03   Company.   The  term "Company"  shall  mean  Orbital
Sciences  Corporation, a Delaware corporation, or  any  successor
thereof.

      2.04  Director.  The term "Director" shall mean a member of
the  Board,  or  a  member  of  the board  of  directors  of  any
Participating Company.

      2.05  Effective Date.  The term "Effective Date" shall mean
August 2, 1990.

     2.06  Eligible Director.  The term "Eligible Director" shall
mean  any Director who is not an employee of the Company  or  any
Participating  Company  and is not a  holder  of  more  than  two
percent  (2%) of the outstanding Shares, nor a person who  is  an
affiliate of any such holder.

      2.07  Exchange Act.  The term "Exchange Act" shall mean the
Securities Exchange Act of 1934, as amended.

     2.08  Fair Market Value.  The term "Fair Market Value," when
used  with  respect to the determination of the option  price  of
Options, shall mean the closing sale price of outstanding  Shares
on  the  national securities exchange on which outstanding Shares
are  then principally traded or, if that measure of price is  not
available,  on a composite index of such exchanges  or,  if  that
measure of price is not available, in a national market system on
which  outstanding Shares are quoted on the date of the grant  of
the  Option.  In the event that there are no sales of outstanding
Shares  on any such exchange or market on such date of the  grant
of the Option, the fair market value of Shares on the date of the
grant  shall be deemed to be the closing sales price on the  next
preceding day on which outstanding Shares were sold on  any  such
exchange  or market.  In the event that Shares are not listed  or
quoted  on any such exchange or market on such date of the  grant
of the Option, a reasonable valuation of the fair market value of
the Shares on the date of the grant shall be made by the Board.

      2.09   I.R.C.   The term "I.R.C." shall mean  the  Internal
Revenue Code of 1986, as it has been or may be amended from  time
to time.

      2.10   Incentive  Stock Option.  The term "Incentive  Stock
Option"   shall   mean  any  Option  intended  to   satisfy   the
requirements  under I.R.C. Section 422(b) as an  incentive  stock
option.

      2.11   Nonstatutory  Stock Option.  The term  "Nonstatutory
Stock  Option" shall mean any Option granted under the Plan  that
does not qualify as an Incentive Stock Option.

      2.12   Option.  The term "Option" shall mean an  option  to
acquire Shares granted under the Plan.

      2.13  Optionee.  The term "Optionee" shall mean an Eligible
Director who has been granted Options.

      2.14   Parent  Corporation.  The term "Parent  Corporation"
shall mean a corporation as defined in I.R.C. Section 425(e).

       2.15   Participating  Company.   The  term  "Participating
Company"  shall  mean the Company and any Parent  Corporation  or
Subsidiary Corporation.

      2.16   Plan.  The term "Plan" shall refer to the 1990 Stock
Option  Plan for Non-Employee Directors of the Company set  forth
herein  that  provides  for the granting  of  Nonstatutory  Stock
Options.

      2.17  Securities Act.  The term "Securities Act" shall mean
the Securities Act of 1933, as amended.

      2.18   Shares.  The term "Shares" shall mean shares of  the
Company's  authorized Common Stock, $0.01 par value, and  may  be
unissued  shares  or  treasury shares  or  shares  purchased  for
purposes of the Plan.

       2.19    Subsidiary  Corporation.   The  term   "Subsidiary
Corporation"  shall  mean  a corporation  as  defined  in  I.R.C.
Section 425(f).

       2.20   Terminating  Transaction.   The  term  "Terminating
Transaction"  shall mean any of the following  events:   (a)  the
dissolution  or liquidation of the Company; (b) a reorganization,
merger  or  consolidation of the Company with one or  more  other
corporations  as  a  result of which  the  Company  goes  out  of
existence  or becomes a subsidiary of another corporation  (which
shall  be  deemed  to have occurred if another corporation  shall
own, directly or indirectly, eighty percent (80%) or more of  the
aggregate  voting power of all outstanding equity  securities  of
the  Company);  (c) a sale of substantially all of the  Company's
assets;  or  (d)  a sale to one person (or two  or  more  persons
acting   in   concert)  of  equity  securities  of  the   Company
representing eighty percent (80%) or more of the aggregate voting
power  of  all outstanding equity securities of the Company.   As
used  herein  or elsewhere in this Plan, the word "person"  shall
mean  an  individual,  corporation, partnership,  association  or
other  person  or  entity, or any group of two  or  more  of  the
foregoing that have agreed to act together.

      2.21   Termination Date.  The term "Termination Date" shall
mean August 2, 2000.

      2.22   Total Disability.  The term "Total Disability" shall
mean a total and permanent disability as that term is defined  in
I.R.C. Section 22(e)(3).


                          ARTICLE III
                     ADMINISTRATION OF PLAN

       3.01    Administration  by  Board.   The  Plan  shall   be
administered  by  the  Board.  The  Board  shall  have  full  and
absolute power and authority in its sole discretion (a) to  grant
Options in accordance with the Plan to Eligible Directors; (b) to
prescribe the form or forms of instruments evidencing Options and
any  other instruments required under the Plan and to change such
forms  from  time to time; (c) to adopt, amend and rescind  rules
and  regulations for the administration of the Plan; and  (d)  to
interpret  the  Plan and to decide any questions and  settle  all
controversies and disputes that may arise in connection with  the
Plan.

     3.02  Rules and Regulations.  The Board may adopt such rules
and regulations as the Board may deem necessary or appropriate to
carry out the purposes of the Plan and shall have authority to do
everything necessary or appropriate to administer the Plan.

      3.03   Binding  Authority.  All decisions,  determinations,
interpretations  or other actions by the Board  shall  be  final,
conclusive and binding on all parties and on their successors-in-
interest.

      3.04  Administration by Committee.  The Board, in its  sole
discretion,  may,  from  time to time,  appoint  a  Committee  to
administer the Plan and exercise all of the powers, authority and
discretion of the Board under the Plan, other than the power  and
authority to amend and terminate the Plan under Section 7.01.


                           ARTICLE IV
              NUMBER OF SHARES AVAILABLE FOR GRANT

            Subject  to  the provisions of this  Article  IV  and
Section 6.08(a), the maximum aggregate number of Shares which may
be  optioned  and sold under the Plan is 170,000.  In  the  event
that outstanding Options shall, for any reason, terminate, lapse,
be  forfeited  or  expire  without being  exercised,  the  Shares
subject to such unexercised Options shall again be available  for
the  granting  of  Options.  In the event that Shares  that  were
previously  issued by the Company upon exercise of an Option  are
reacquired  by the Company as part of the consideration  received
(in  accordance with Section 6.05(b) hereof) upon the  subsequent
exercise  of  an  Option, such reacquired Shares shall  again  be
available for the granting of Options.


                           ARTICLE V
                          TERM OF PLAN

            The  Plan shall be effective as of the Effective Date
and  shall terminate on the Termination Date.  No Option  may  be
granted after the Termination Date.


                           ARTICLE VI
                          OPTION TERMS

     6.01  Number of Options Shares and Form of Option Agreement.
Each  Eligible  Director shall be granted  a  Nonstatutory  Stock
Option  for  two thousand (2,000) Shares on August 2,  1991.   In
addition,  each Eligible Director shall be granted a Nonstatutory
Stock  Option for two thousand (2,000) Shares on January 2,  1991
and  on each anniversary thereafter through January 2, 1995,  and
three  thousand  (3,000) Shares on January 2, 1996  and  on  each
anniversary thereafter, provided that such individual is then  an
Eligible Director.  Any Option granted shall be evidenced  by  an
agreement ("Option Agreement") in such form as the Board, in  its
discretion,  may,  from  time  to  time,  approve.   Any   Option
Agreement  shall contain such terms and conditions as  the  Board
may  deem necessary or appropriate and which are not inconsistent
with the provisions of the Plan.

      6.02  Option Exercise Price.  The option exercise price for
Shares  covered by Options shall be the Fair Market Value of  the
Shares.

     6.03  Vesting and Exercisability of Options.  Subject to the
limitations  set  forth  herein and/or in any  applicable  Option
Agreement entered into hereunder, Options granted shall vest  and
be  exercisable in accordance with the rules set  forth  in  this
Section 6.03:

            (a) General.  Subject to the other provisions of this
Section  6.03,  Options  shall vest  and  become  exercisable  in
accordance with the following formula:

                 (i)  Options  granted on August  2,  1990  shall
     become  exercisable  to the extent of  one  hundred  percent
     (100%) of the Shares covered thereby on January 2, 1991; and

                (ii)  Options granted after August 2, 1990  shall
     become  exercisable as to one hundred percent (100%) of  the
     Shares covered thereby on the first anniversary of the  date
     of grant.

            (b)  Termination of Options.  All installments of  an
Option  shall  expire and terminate ten (10) years from  the  day
before  the date such Option was granted (the "Option Termination
Date").

           (c) Termination of Directorship other than by Death or
Total Disability.  In the event that an Optionee ceases to  be  a
Director  for  any reason (other than death or Total Disability),
any Options held by such Optionee that have not vested and become
exercisable as of the directorship termination date shall  expire
and become unexercisable as of the directorship termination date.
All  vested  and  exercisable  Options  as  of  the  directorship
termination date shall expire and become unexercisable as of  the
earlier  of  (i)  three  (3)  months following  the  directorship
termination  date  or (ii) the original Option Termination  Date.
For  purposes of the Plan, an Optionee who is a Director  of  any
Participating  Company shall not be deemed  to  have  incurred  a
termination  of his directorship so long as such  Optionee  is  a
Director of any Participating Company.

            (d)  Death  or Total Disability of Optionee  while  a
Director.  In the event that the directorship of an Optionee with
a Participating Company is terminated by reason of death or Total
Disability,  any  vested and exercisable  Options  held  by  such
Optionee shall expire and become unexercisable as of the  earlier
of  (i) the applicable Option Termination Date or (ii) the  first
anniversary  of the date of termination of directorship  of  such
Optionee by reason of the Optionee's death or Total Disability.

            Any  such  vested  and  exercisable  Options  may  be
exercised prior to their expiration only by the person or persons
to  whom the Optionee's Option rights pass by will or the laws of
descent and distribution.  Any Options held by such a deceased or
disabled Optionee that are not vested and exercisable as  of  the
date  of the Director's termination of directorship due to  death
or  Total Disability shall expire and become unexercisable as  of
the directorship termination date.

             (e)  Termination  of  Affiliation  of  Participating
Company.   Notwithstanding  the  foregoing  provisions  of   this
Section 6.03, in the case of an Optionee who is a Director  of  a
Participating Company other than the Company, upon an Affiliation
Termination  (as  defined herein) of such Participating  Company,
such  Optionee shall be deemed (for all purposes of the Plan)  to
have incurred a termination of his directorship for reasons other
than  death  or  Total Disability, with such  termination  to  be
deemed  effective  as of the effective date of  said  Affiliation
Termination.   As used herein, the term "Affiliation Termination"
shall  mean,  with  respect  to  a  Participating  Company,   the
termination   of  such  Participating  Company's  status   as   a
Participating Company.

      6.04   Exercise of Options.  Options may be  exercised,  in
whole  or  in part, by giving written notice of exercise  to  the
Company,  which notice shall specify the number of Shares  to  be
purchased  and  shall be accompanied by payment in  full  of  the
purchase price in accordance with Section 6.05.  An Option  shall
be deemed exercised when such written notice of exercise has been
received  by the Company.  No Shares shall be issued  until  full
payment  has been made and the Optionee has satisfied such  other
conditions as may be required by the Plan, as may be required  by
applicable  laws, rules or regulations, or as may be  adopted  or
imposed  by the Board.  Until the issuance of stock certificates,
no  right to vote or receive dividends or any other rights  as  a
stockholder   shall  exist  with  respect  to   optioned   Shares
notwithstanding  the exercise of the Option.  No adjustment  will
be  made for a dividend or other right for which the record  date
is  prior to the date the stock certificate is issued, except  as
provided in Section 6.08(a).



     6.05  Payment of Option Exercise Price.

            (a)  Except as otherwise provided in Section 6.05(b),
the  entire option exercise price shall be paid at the  time  the
Option  is  exercised by cashier's check or such other  means  as
deemed acceptable by the Company.

            (b)  An Optionee may elect to pay for all or some  of
the  Optionee's  Shares with Shares to which the Optionee  has  a
right  at  the  time  of the exercise by the Optionee,  including
Shares  to  which the Optionee has obtained a right  by  previous
exercise,   subject  to  all  restrictions  and  limitations   of
applicable  laws,  rules  and  regulations  and  subject  to  the
satisfaction  of any conditions the Board may impose,  including,
but  not  limited  to,  the  making of such  representations  and
warranties  and the providing of such other assurances  that  the
Board  may  require with respect to the Optionee's title  to  the
Shares  used  for  payment of the exercise price.   Such  payment
shall  be  made by delivery of certificates representing  Shares,
duly  endorsed  or  with duly signed stock power  attached,  such
Shares to be valued at the last reported sale price of the Shares
on  a  national securities exchange or national market system  on
the  date  immediately preceding the day notice  of  exercise  is
received by the Company or, if such Shares are not then listed or
quoted on such an exchange or market, on such basis as the  Board
shall determine.

      6.06  Options Not Transferable.  Options granted under  the
Plan   may   not   be  sold,  pledged,  hypothecated,   assigned,
encumbered, gifted or otherwise transferred or alienated  in  any
manner, either voluntarily or involuntarily by operation of  law,
other  than by will or the laws of descent and distribution,  and
may  be exercised during the lifetime of an Optionee only by such
Optionee.

     6.07  Restrictions on Issuance of Shares.

            (a)  No  Shares  shall be issued  or  delivered  upon
exercise  of  an  Option unless and until there shall  have  been
compliance  with  all applicable requirements of  the  Securities
Act,  all  applicable  listing  or similar  requirements  of  any
national  securities exchange or national market system on  which
Shares  are  then listed or quoted, and any other requirement  of
law  or  of  any  regulatory body having jurisdiction  over  such
issuance  and delivery.  The inability of the Company  to  obtain
any  required permits, authorizations or approvals necessary  for
the  lawful  issuance and sale of any Shares hereunder  on  terms
deemed  reasonable by the Board shall relieve  the  Company,  the
Board  and any Committee of any liability in respect of the  non-
issuance  or  sale  of  such Shares as to  which  such  requisite
permits,   authorizations  or  approvals  shall  not  have   been
obtained.

            (b) As a condition to the granting or exercise of any
Option,  the Board may require the person receiving or exercising
such  Option  to make any representation and/or warranty  to  the
Company  as  may  be  required  under  any  applicable   law   or
regulation, including, but not limited to, a representation  that
the  Option  and/or Shares are being acquired only for investment
and  without  any  present intention to sell or  distribute  such
Option and/or Shares, if such a representation is required  under
the  Securities  Act  or  any  other  applicable  law,  rule   or
regulation.

           (c) The grant of Options prior to approval of the Plan
by  the affirmative vote or written consent of a majority of  the
holders of outstanding Shares represented and voting at a meeting
or  by  written  consent is conditioned on  such  approval  being
obtained  within twelve (12) months of the adoption of the  Plan.
In  the  event  such stockholder approval is not obtained  within
such time period, any outstanding Options shall be void.

     6.08  Option Adjustments.

             (a)   If   the  outstanding  Shares  are  increased,
decreased,  changed into or exchanged for a different  number  or
kind   of   shares   of   the  Company  through   reorganization,
recapitalization, reclassification, stock dividend,  stock  split
or  reverse  stock  split, upon authorization  of  the  Board,  a
proportionate adjustment shall be made in the number or  kind  of
shares  and  the  per-share option price thereof,  which  may  be
issued in the aggregate and to individual Optionees upon exercise
of  Options; provided, however, that no such adjustment  need  be
made  if,  upon the advice of counsel, the Board determines  that
such  adjustment  may result in the receipt of federally  taxable
income to holders of outstanding Options or the holders of Common
Stock or other classes of the Company's securities.

            (b) In the event of any Terminating Transaction,  all
outstanding  Options  shall  become  exercisable  prior  to   the
consummation of such Terminating Transaction and the Board  shall
take  all  necessary actions to ensure that such  Options  remain
exercisable  for a period of at least twenty (20) days  prior  to
the   consummation.    Upon  consummation  of   the   Terminating
Transaction, all outstanding Options shall terminate and cease to
be  exercisable.  There shall be excluded from the  operation  of
the   provisions   of  this  Section  6.08(b)   any   Terminating
Transaction  in  which:   (i) the holders of  outstanding  Shares
prior to the Terminating Transaction retain or acquire securities
constituting a majority of the outstanding voting common stock of
the  acquiring  or  surviving corporation or  other  entity;  and
(ii)  no  single  person owns more than half of  the  outstanding
voting common stock of the acquiring or surviving corporation  or
other  entity.   For  purposes of this  Section  6.08(b),  voting
common  stock of the acquiring or surviving corporation or  other
entity, upon exercise of warrants or options, shall be considered
outstanding,  and  all securities that vote in  the  election  of
directors  (other than solely as the result of a default  in  the
making  of  any  dividend or other payment) shall  be  deemed  to
constitute that number of shares of voting common stock  that  is
equivalent  to the number of such votes that may be cast  by  the
holders of such securities.

            Notwithstanding the foregoing, in the event that  any
person  or  group  of  persons  commences  a  tender  offer   for
outstanding Shares within the scope of Regulation 14D  under  the
Exchange  Act,  all outstanding Options shall become  immediately
exercisable.  Any Shares received upon this accelerated  exercise
that  are not purchased pursuant to the offer (whether by failure
of  the offer or otherwise) shall be subject to repurchase at the
exercise  price by the Company upon termination of the Optionee's
service  as  a Director, in accordance with the vesting  schedule
that corresponds to the schedule of exercisability for the Option
under which the Shares were acquired.

            (c)  To  the maximum extent possible, any adjustments
authorized   under  this  Section  6.08  with  respect   to   any
outstanding  Options  shall  be  made  by  means  of  appropriate
adjustments to the number of Shares (or other securities) and the
option exercise price therefor under the unexercised portions  of
such  outstanding  Options, but without  changing  the  aggregate
exercise price applicable to said unexercised portions.   In  all
cases,  the  nature and extent of adjustments under this  Section
6.08 shall be determined by the Board in its sole discretion, and
any  such determination as to what adjustments shall be made, and
the  extent  thereof, shall be final and binding.  No  fractional
shares  of stock shall be issued under the Plan pursuant  to  any
such adjustment.

      6.09  Taxes.  The Board shall make such provisions and take
such  steps  as  it  deems  necessary  or  appropriate  for   the
withholding  of any federal, state, local and other tax  required
by law to be withheld with respect to the grant or exercise of an
Option,  or  with  respect to the disposition of Shares  acquired
pursuant  to  the  exercise of an Option pursuant  to  the  Plan,
including, but not limited to, the deduction of the amount of any
such  withholding  tax  from any compensation  or  other  amounts
payable  to  an  Optionee  by  any member  of  the  Participating
Companies,   or   requiring  an  Optionee  (or   the   Optionee's
beneficiary or legal representative), as a condition of  granting
or   exercising  an  Option,  to  pay  to  any  member   of   the
Participating Companies any amount required to be withheld, or to
execute  such  other  documents as the Board deems  necessary  or
desirable  in connection with the satisfaction of any  applicable
withholding obligation.  An Optionee may, in lieu of remitting to
the  Company amounts sufficient to satisfy federal, state,  local
or  other  withholding tax requirements, direct  the  Company  to
withhold Shares or deliver Shares in each case with a value equal
to such withholding tax requirements.

      6.10   Legends  on  Options and Stock  Certificates.   Each
Option   Agreement  and  each  certificate  representing   Shares
acquired  upon exercise of an Option shall be endorsed  with  all
legends,  if  any,  required  by  applicable  federal  and  state
securities  laws to be placed on the Option Agreement and/or  the
certificate.  The determination of which legends, if  any,  shall
be placed upon Option Agreements and/or said Shares shall be made
by  the Board in its sole discretion, and such decision shall  be
final and binding.


                          ARTICLE VII
                AMENDMENT OR TERMINATION OF PLAN

            The  Board may amend, alter and/or terminate the Plan
at any time; provided, however, that no change shall be effective
unless approved by the stockholders of the Company if such change
would  cause  the Plan to fail to comply with Rule 16b-3  of  the
Exchange Act or any successor rule under such Act as in effect on
the  date  of  such  amendment; provided,  further,  that  unless
required  by applicable law, rule or regulation, no amendment  of
the  Plan  shall affect in a material and adverse manner  Options
granted  prior  to  the  date of any such amendment  without  the
consent  of  any Optionee holding any such affected Options;  and
provided, further, that the provisions of Sections 6.01, 6.02 and
6.03  shall  not be amended more than once every six (6)  months,
other  than  to comport with changes in the I.R.C., the  Employee
Retirement Income Security Act or the rules thereunder.





                          ARTICLE VIII
                       GENERAL PROVISIONS

     8.01  Availability of the Plan.  A copy of the Plan shall be
delivered to the Secretary of the Company and shall be  shown  by
the  Secretary to any Eligible Director making reasonable inquiry
concerning the Plan.

     8.02  Notice.  Any notice or other communication required or
permitted  to be given pursuant to the Plan or under  any  Option
Agreement  must be in writing and may be given by  registered  or
certified  mail  and, if given by registered or  certified  mail,
shall  be  determined  to have been given  and  received  when  a
registered  or certified letter containing such notice,  properly
addressed with postage prepaid, is deposited in the United States
mails  and,  if given otherwise than by registered  or  certified
mail,  shall be deemed to have been given when delivered  to  and
received  by the party to whom addressed.  Notice shall be  given
to Eligible Directors at their most recent addresses shown in the
Company's  records.  Notice to the Company shall be addressed  to
the  Company at the address of the Company's principal  executive
offices, to the attention of the Secretary of the Company.

      8.03  Titles and Headings.  Titles and headings of sections
of  the Plan are for convenience of reference only and shall  not
affect the construction of any provision of the Plan.

      8.04   Governing  Law.   The Plan  shall  be  governed  by,
interpreted  under and construed and enforced in accordance  with
the  internal  laws, and not the laws pertaining to conflicts  or
choice  of  laws,  of  the  State  of  Delaware,  applicable   to
agreements  made and to be performed wholly within the  State  of
Delaware.






               AMENDMENT NO. 2 TO CREDIT AGREEMENT
                                
     AMENDMENT No. 2 dated as of July 5, 1995 among ORBITAL
SCIENCES CORPORATION (the "Company"), ORBITAL IMAGING CORPORATION
and FAIRCHILD SPACE AND DEFENSE CORPORATION, the BANKS listed on
the signature pages hereof, MORGAN GUARANTY TRUST COMPANY OF NEW
YORK,  as Administrative Agent (the "Administrative Agent"), and
J.P. MORGAN DELAWARE, as Collateral Agent.


                      W I T N E S S E T H :
                                
     WHEREAS, the parties hereto have heretofore entered into an
Amended and Restated Credit and Reimbursement Agreement dated as
of September 27, 1994 (as amended from time to time, the
"Agreement"); and

     WHEREAS, the parties hereto desire to amend the Agreement as
set forth below;

     NOW, THEREFORE, the parties hereto agree as follows:

          SECTION 1.     Definitions; References.  Unless
otherwise specifically defined herein, each term used herein
which is defined in the Agreement shall have the meaning assigned
to such term in the Agreement.  Each reference to "hereof",
"hereunder", "herein" and "hereby" and each other similar
reference and each reference to "this Agreement" and each other
similar reference contained in the Agreement shall from and after
the date hereof refer to the Agreement as amended hereby.

          SECTION 2.     Additional Permitted Investment.
Section 5.07 of the Agreement is amended by:

          (i)  deleting the preposition "and" at the end of
clause (d) thereof;

          (ii) renumbering clause (e) thereof as clause (f); and

          (iii)     inserting a new clause (e) immediately
following clause (d) thereof, to read in its entirety as follows:

     "(e)  Investments made by the Company or any of its
     Wholly-Owned Subsidiaries, substantially on the terms
     described by the Company to the Banks in the "Project
     Summary-American Space Lines" dated June, 1995, copies
     of which have been delivered to each of the Banks, in
     an aggregate principal amount not exceeding
     $68,000,000, in any entity or entities through which
     the Company or any of its Wholly-Owned Subsidiaries
     will participate in the development, construction,
     operation and/or marketing of the X-34 small reusable
     launch vehicles; and"

          SECTION 3.     Waiver Under Company Security Agreement.
The Banks waive (i) compliance by the Company with the terms of
Section 4(H) of the Company Security Agreement solely to the
extent necessary to permit the Company to  novate the Cooperative
Agreement effective March 30, 1995 between the Company and the
National Aeronautics and Space Administration and (ii) any
Default arising under the Credit Agreement by reason of
noncompliance by the Company with such Section solely as a result
of such novation.  Other than as specifically provided herein,
this Section shall not operate as a waiver of any right, remedy,
power or privilege of the Banks under any Financing Document or
of any other term or condition of any Financing Document.

          SECTION 4.     New York Law.  This Amendment shall be
governed and construed in accordance with the laws of the State
of New York.

          SECTION 5.     Counterparts; Effectiveness.  This
Amendment may be singed in any number of counterparts, each of
which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.
This Amendment shall become effective upon receipt by the
Administrative Agent of duly executed counterparts hereof signed
by the Borrowers and the Required Banks (or, in the case of any
party as to which an executed counterpart shall not have been
received, the Administrative Agent shall have received
telegraphic, telex or other written confirmation from such party
of execution of a counterpart hereof by such party).

          IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be duly executed as of the date first written above.

                              
                              ORBITAL SCIENCES CORPORATION
                              
                              
                              By  /s/ Carlton B. Crenshaw
                              Title:  Sr. Vice President/Finance
                              & Administration and Treasurer
                              
                              
                              ORBITAL IMAGING CORPORATION
                              
                              
                              By  /s/ Carlton B. Crenshaw
                                   Title:  Chief Financial
                              Officer
                                   and Treasurer
                              
                              
                              FAIRCHILD SPACE AND DEFENSE
                              CORPORATION
                              
                              
                              By  /s/ Carlton B. Crenshaw
                                   Title:  Treasurer
                              
                              MORGAN GUARANTY TRUST COMPANY OF
                              NEW YORK
                              
                              
                              By  /s/ Kevin J. O'Brien
                                   Title:  Vice President
                              
                              
                              THE BANK OF NOVA SCOTIA
                              
                              
                              By  /s/ J.R. Trimble
                                   Title:  Senior Relationship
                              Manager
                              
                              
                              SIGNET BANK/VIRGINIA
                              
                              
                              By  /s/ Ronald K. Hobson
                                   Title:  Vice President
                              
                              
                              NATIONSBANK, N.A.
                              
                              By  /s/ James W. Gaittens
                                   Title:  Vice President
                              
                              
                              THE BANK OF TOKYO TRUST COMPANY
                              
                              By  ______________________________
                                   Title:
                              
                              
                              THE DAIWA BANK, LIMITED
                              
                              By  /s/ Kevin Rauschenberg
                                   Title:  Vice President
                              
                              By  /s/ Louanne Baily
                                   Title:  Vice President and
                              Manager


<TABLE>

                                   Exhibit 11.
                 Statement re: Computation of Earnings Per Share
<CAPTION>
                                                                                                                                    
Three Month Period Ended                                     Six Month Period Ended                       
June 30,                                   1995              June 30,                                            1995
_____________________________              ____              ______________________________                      ____

                                                 Assuming                                                                Assuming
                                   Primary        Full                                                    Primary         Full 
                                                Dilution                                                                 Dilution
                                   __________   __________                                                _________      __________
<S>                               <C>           <C>           <C>                                        <C>            <C>
Weighted average of outstanding                               Weighted average of outstanding                                      
shares                             20,826,527    20,826,527    shares                                     20,518,375     20,518,375
                                                                                                                                    
Common equivalent shares:                                      Common equivalent shares:                                            
     Outstanding stock options        394,297       394,297         Outstanding stock options               435,984        449,422
                                                                                                                                   
Other potentially dilutive                                     Other potentially dilutive securities:                               
securities:
    Convertible debentures                 N/A    3,895,652        Convertible debentures                        N/A      3,895,652
                                                                                                                                    
Shares used in computing                                       Shares used in computing                                             
net income per share                21,220,824   25,116,476    net income per share                       20,954,359     24,863,449
                                                                                                                                   
Net income                          ($726,479)   ($726,479)    Net income                               ($2,919,082)   ($2,919,082)
                                                                                                                                   
Adjustments assuming full dilution:                            Adjustments assuming full dilution:                                  
  interest expense, net of taxes          N/A    1,228,625        interest expense, net of taxes                N/A      2,273,250
                                                                                                                                   
Net income, assuming full dilution  ($726,479)     $502,146    Net income, assuming full dilution       ($2,919,082)     ($645,832)
                                                                                                                                   
Net income per share                   ($0.034)       $0.020    Net income per share                         ($0.139)       ($0.026)
                                                                                                                                   
Dilution percentage assuming               N/A     158.824%    Dilution percentage assuming full                 N/A        81.295%
full dilution <F1>                                             dilution <F1>
                                                                                                                                   
Net income per share used              ($0.03)      ($0.03)    Net income per share used                     ($0.14)        ($0.14)
                                                                                                                                   
Notes:
<FN> 
<F1> Provided that dilution is greater than 3%, the convertible debentures
are considered dilutive in the calculation and presentation of per share data.
</FN>
</TABLE>


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE 
CONSOLIDATED BALANCE SHEETS AND CONSOLIDATED STATEMENTS OF EARNINGS AT AND 
FOR THE THREE MONTHS ENDED JUNE 30, 1995 AND IS QUALIFIED IN ITS 
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000820736
<NAME> ORBITAL SCIENCES CORP /DE/
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1994
<PERIOD-START>                              APR-1-1995
<PERIOD-END>                               JUN-30-1995
<CASH>                                          18,377
<SECURITIES>                                    21,440
<RECEIVABLES>                                   83,943
<ALLOWANCES>                                     (567)
<INVENTORY>                                     28,320
<CURRENT-ASSETS>                               159,658
<PP&E>                                         132,248
<DEPRECIATION>                                (30,366)
<TOTAL-ASSETS>                                 408,834
<CURRENT-LIABILITIES>                           66,772
<BONDS>                                         95,203
<COMMON>                                           227
                                0
                                          0
<OTHER-SE>                                     235,387
<TOTAL-LIABILITY-AND-EQUITY>                   408,834
<SALES>                                         64,589
<TOTAL-REVENUES>                                64,589
<CGS>                                           47,806
<TOTAL-COSTS>                                   47,806
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                    30
<INTEREST-EXPENSE>                               1,241
<INCOME-PRETAX>                                (1,570)
<INCOME-TAX>                                     (843)
<INCOME-CONTINUING>                              (727)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     (727)
<EPS-PRIMARY>                                    (.03)
<EPS-DILUTED>                                    (.03)
        


</TABLE>


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