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.



                                
                               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
                                                                         

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





               ORBITAL SCIENCES CORPORATION
       CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
       (Unaudited; in thousands, except share data)
                                                                                               
                                                                                
                                                                          Three Months
                                                                              Ended
                                                                            June 30,
                                                                  1995                   1994
                                                                                   
                                                                                               
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





                     ORBITAL SCIENCES CORPORATION
       CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
        (Unaudited; in thousands, except share data)
                                         
                                                              Six Months Ended
                                                                  June 30,
                                                             1995          1994
                                                                            
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




                ORBITAL SCIENCES CORPORATION
      CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                 (Unaudited; in thousands)
                                                                    
                                                                    
                                                                         Six Months Ended
                                                                             June 30,
                                                                   1995             1994
                                                                              
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




                  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.


                           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





                          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).