UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

___________________________________

FORM 10-Q

 (Mark One)

þ	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended June 30, 2009

OR

o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from ______ to ______

Commission file number 1-14279

____________________________________

ORBITAL SCIENCES CORPORATION

(Exact name of registrant as specified in charter)

Delaware	06-1209561
(State of Incorporation of Registrant)	(I.R.S. Employer Identification No.)

21839 Atlantic Boulevard

Dulles, Virginia  20166

(Address of principal executive offices)

(703) 406-5000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has 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 (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes þ  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes o  No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company.  See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.  (Check one):

Large accelerated filer þ                                            Accelerated filer o      Non-accelerated filer o       Smaller reporting company o

(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes o  No þ

As of July 27, 2009, 56,482,396 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)

	June 30,			December 31,
	2009			2008
				(As Adjusted)
ASSETS
Current assets:
Cash and cash equivalents	$	340,287		$	328,307
Receivables, net		217,740			203,111
Inventories, net		44,941			33,434
Deferred income taxes, net		39,331			35,368
Other current assets		3,533			8,951
Total current assets		645,832			609,171
Investments		14,700			16,700
Property, plant and equipment, net		115,932			104,880
Goodwill		55,551			55,551
Deferred income taxes, net		52,248			63,206
Other non-current assets		24,848			4,387
Total assets	$	909,111		$	853,895
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable and accrued expenses	$	149,646		$	179,658
Deferred revenues and customer advances		152,928			80,059
Total current liabilities		302,574			259,717
Long-term obligations		117,780			115,372
Other non-current liabilities		8,170			5,700
Total liabilities		428,524			380,789
Commitments and contingencies
Stockholders’ equity:
Preferred Stock, par value $.01; 10,000,000 shares authorized, none outstanding		—			—
Common Stock, par value $.01; 200,000,000 shares authorized, 56,482,376 and
57,499,260 shares outstanding, respectively		565			575
Additional paid—in capital		537,214			547,389
Accumulated other comprehensive loss		(3,088	)		(2,813	)
Accumulated deficit		(54,104	)		(72,045	)
Total stockholders’ equity		480,587			473,106
Total liabilities and stockholders’ equity	$	909,111		$	853,895

See accompanying notes to condensed consolidated financial statements.

ORBITAL SCIENCES CORPORATION

CONDENSED CONSOLIDATED INCOME STATEMENTS

(Unaudited, in thousands, except per share data)

	Quarters Ended June 30,						Six Months Ended June 30,
	2009			2008			2009			2008
				(As Adjusted)						(As Adjusted)
Revenues	$	270,129		$	301,223		$	565,870		$	584,768
Cost of revenues		208,815			242,789			455,163			477,471
Research and development expenses		30,734			10,202			49,705			18,406
Selling, general and administrative expenses		17,759			21,745			37,017			42,413
Income from operations		12,821			26,487			23,985			46,478
Investment impairment charge		(600	)		(10,600	)		(1,300	)		(10,600	)
Interest income and other		1,750			1,452			7,413			3,838
Interest expense		(2,157	)		(2,187	)		(4,414	)		(4,321	)
Income from continuing operations before income taxes		11,814			15,152			25,684			35,395
Income tax provision		(3,075	)		(5,041	)		(7,743	)		(13,222	)
Income from continuing operations		8,739			10,111			17,941			22,173
Income from discontinued operations, net of taxes		—			14,969			—			15,918
Net income	$	8,739		$	25,080		$	17,941		$	38,091
Basic income per share:
Income from continuing operations	$	0.15		$	0.17		$	0.31		$	0.37
Income from discontinued operations		—			0.25			—			0.27
Net income		0.15			0.42			0.31			0.64
Diluted income per share:
Income from continuing operations	$	0.15		$	0.17		$	0.31		$	0.36
Income from discontinued operations		—			0.24			—			0.26
Net income		0.15			0.41			0.31			0.62

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,
	2009			2008
				(As Adjusted)
Operating Activities:
Net income	$	17,941		$	38,091
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of business, net of tax		—			(14,800	)
Investment impairment charge		1,300			10,600
Depreciation expense		9,632			9,156
Deferred income taxes		6,668			10,091
Stock-based compensation and other		6,683			6,441
Changes in assets and liabilities		2,093			(16,656	)
Net cash provided by operating activities		44,317			42,923
Investing Activities:
Capital expenditures		(18,357	)		(11,855	)
Net proceeds from sale of business		—			39,882
Net proceeds from sale of property		100			2,193
Sale of investment		1,138			—
Other		84			1,081
Net cash (used in) provided by investing activities		(17,035	)		31,301
Financing Activities:
Repurchase of common stock		(16,681	)		(15,131	)
Net proceeds from issuances of common stock		1,262			6,216
Tax benefit of stock-based compensation		117			2,427
Net cash used in financing activities		(15,302	)		(6,488	)
Net increase in cash and cash equivalents		11,980			67,736
Cash and cash equivalents, beginning of period		328,307			235,822
Cash and cash equivalents, end of period	$	340,287		$	303,558

See accompanying notes to condensed consolidated financial statements.

ORBITAL SCIENCES CORPORATION

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2009 and 2008

(Unaudited)

(1)  Basis of Presentation

Orbital Sciences Corporation (together with its subsidiaries, “Orbital” or the “company”), a Delaware corporation, develops and manufactures small- and medium-class rockets and space systems for commercial, military and civil government customers.

In the opinion of management, the accompanying unaudited interim financial information reflects all adjustments, consisting of normal recurring accruals, necessary for a fair presentation on a going concern basis.  We have evaluated all subsequent events through July 29, 2009, the date the financial statements were issued.  Certain information and footnote disclosure normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America have been condensed or omitted pursuant to instructions, rules and regulations prescribed by the U.S. Securities and Exchange Commission.  The company believes that the disclosures provided herein are adequate to make the information presented not misleading when these unaudited interim condensed consolidated financial statements are read in conjunction with the audited consolidated financial statements contained in the company’s Annual Report on Form 10-K for the year ended December 31, 2008.

Operating results for the quarter ended June 30, 2009 are not necessarily indicative of the results expected for the full year.

(2)  Preparation of Condensed Consolidated Financial Statements

The preparation of condensed consolidated financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions, including estimates of future contract costs and earnings.  Such estimates and assumptions affect the reported amounts of assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and earnings during the current reporting period.  Management periodically assesses and evaluates the adequacy and/or deficiency of liabilities recorded for various reserves, contract risks and other uncertainties.  Actual results could differ from these estimates and assumptions.

All financial amounts are stated in U.S. dollars unless otherwise indicated.

(3)  Prior Period Adjustment for Adoption of New Accounting Standard

On January 1, 2009, the company adopted Financial Accounting Standards Board (“FASB”) Staff Position (“FSP”) No. APB 14-1 (“FSP No. APB 14-1”), “Accounting for Convertible Debt Instruments That May Be Settled in Cash upon Conversion (Including Partial Cash Settlement).”  The new accounting guidance requires the company to separately account for the liability and equity components of its $143.8 million of 2.4375% convertible senior subordinated notes due 2027 (see Note 9).  FSP No. APB 14-1 is required to be applied retrospectively.

The company determined the liability component of its convertible notes by assessing the fair value of debt instruments without an associated equity component issued by companies with similar credit ratings and terms at the time the company’s notes were issued.  The effective interest rate for non-convertible debt with similar credit ratings and terms was 7.2%.  The company determined the fair value of the equity component of the embedded conversion option by deducting the fair value of the liability component from the initial proceeds of the convertible debt instrument.  The company determined that the fair value of the embedded equity component of the convertible notes at the time of issuance was $37.2 million and this amount has been recorded as an increase to stockholders’ equity.  A corresponding debt discount has been recorded and is being amortized over a seven-year period ending in January 2014, when the convertible notes are first subject to redemption.

Debt issuance costs incurred in connection with the convertible notes amounted to $3.5 million.  The company determined that the portion of these costs that are associated with the equity component was $0.9 million and such amount has been recorded as a reduction to stockholders’ equity.  The remaining $2.6 million of debt issuance costs are being amortized over a seven-year period ending in January 2014.

As of June 30, 2009 and December 31, 2008, the net carrying value of the convertible notes was $117.8 million and $115.4 million, respectively.  The unamortized debt discount was $26.0 million at June 30, 2009 and $28.4 million as of December 31, 2008.

The company recorded additional interest expense of $1.2 million and $1.1 million attributable to the amortization of the debt discount in the second quarter of 2009 and 2008, respectively, and $2.4 million and $2.2 million in the first half of 2009 and 2008, respectively, as a result of the adoption of the new standard.  Total interest expense attributable to the convertible notes was $2.2 million for the second quarter of 2009 and 2008, and $4.4 million and $4.3 million for the first half of 2009 and 2008, respectively.

The following table presents the adjusted line items in the accompanying income statements for the quarter and six months ended June 30, 2008, that were adjusted as a result of the adoption of the new standard (in thousands, except per share data):

	Quarter Ended June 30, 2008
	Previously Reported		Adjustment			As Adjusted
Interest expense		$(1,098)		$(1,089)			$(2,187)
Income from continuing operations before taxes		16,241		(1,089)			15,152
Income tax provision		(5,459)		418			(5,041)
Net income		25,751		(671)			25,080
Basic net income per share		$0.44		$(0.02)			$0.42
Diluted net income per share		0.43		(0.02)	(1)		0.41	(1)
	Six Months Ended June 30, 2008
	Previously Reported		Adjustment			As Adjusted
Interest expense		$(2,143)		$(2,178)			$(4,321)
Income from continuing operations before taxes		37,573		(2,178)			35,395
Income tax provision		(14,058)		836			(13,222)
Net income		39,433		(1,342)			38,091
Basic net income per share		$0.67		$(0.03)			$0.64
Diluted net income per share		0.65		(0.03)	(1)		0.62	(1)

(1)  Reflects the impact of the adoption of FASB FSP No. EITF 03-6-1 (see Note 5).

The following table presents the adjusted line items in the accompanying balance sheet as of December 31, 2008 that were impacted by the adoption of FSP No. APB 14-1 (in thousands):

	Previously Reported	Adjustment		As Adjusted
Non-current deferred income taxes, net	$73,851		$10,645)	$63,206
Other non-current assets	5,033		(646)	4,387
Total assets	865,186		(11,291)	853,895
Long-term obligations	143,750		(28,378)	115,372
Total liabilities	409,167		(28,378)	380,789
Additional paid-in capital	525,027		22,362	547,389
Accumulated deficit	(66,770)		(5,275)	(72,045)
Total stockholders' equity	456,019		17,087	473,106

(4)  Industry Segment Information

Orbital’s products and services are grouped into three reportable business segments:  (i) launch vehicles; (ii) satellites and space systems; and (iii) advanced space programs.  Reportable segments are generally organized based upon product lines.  Corporate office transactions that have not been attributed to a particular segment, as well as consolidating eliminations and adjustments, are reported in corporate and other.  The primary products and services from which the company’s reportable segments derive revenues are:

• Launch Vehicles.  Rockets that are used as interceptor and target vehicles for missile defense systems, small- and medium-class space launch vehicles that place satellites into Earth orbit, and suborbital launch vehicles that place payloads into a variety of high-altitude trajectories.

• Satellites and Space Systems.  Small- and medium-class spacecraft that are used to enable global and regional communications and broadcasting, to conduct space-related scientific research, to carry out interplanetary and other deep-space exploration missions, to enable national security applications, to collect imagery and other remotely-sensed data about the Earth and to demonstrate new space technologies.

• Advanced Space Programs.  Human-rated space systems for Earth-orbit and lunar exploration, advanced launch systems for medium-class satellites, and small satellites and satellite subsystems primarily used for national security space programs and to demonstrate new space technologies.

Intersegment sales are generally negotiated and accounted for under terms and conditions that are similar to other commercial and government contracts.  Substantially all of the company’s assets and operations are located within the United States.

The following table presents operating information and identifiable assets by reportable segment (in thousands):

	Quarters Ended June 30,						Six Months Ended June 30,
	2009			2008			2009			2008
Launch Vehicles:
Revenues(1)	$	117,072		$	115,024		$	236,312		$	220,281
Operating income		4,082			13,399			8,368			21,014
Identifiable assets		161,163			127,609	(2)		161,163			127,609	(2)
Capital expenditures		1,267			955			2,727			4,957
Depreciation		1,470			1,340			3,081			2,627
Satellites and Space Systems:
Revenues(1)	$	94,121		$	108,078		$	204,278		$	214,480
Operating income		7,734			7,578			15,534			15,447
Identifiable assets		165,670			164,119	(2)		165,670			164,119	(2)
Capital expenditures		4,940			3,213			8,464			5,069
Depreciation		2,169			2,222			4,345			4,363
Advanced Space Programs:
Revenues	$	62,053		$	79,719		$	130,399		$	152,328
Operating income		1,005			5,730			83			10,572
Identifiable assets		103,936			85,185	(2)		103,936			85,185	(2)
Capital expenditures		5,171			—			5,749			—
Depreciation		3			3			6			6
Corporate and Other:
Revenues(1)	$	(3,117	)	$	(1,598	)	$	(5,119	)	$	(2,321	)
Operating income		—			(220	)(3)		—			(555	)
Identifiable assets		478,342			476,982	(2)(4)		478,342			476,982	(2)(4)
Capital expenditures		1,082			951	(3)		1,417			1,829	(3)
Depreciation		1,114			1,056	(3)		2,200			2,160	(3)
Consolidated:
Revenues	$	270,129		$	301,223		$	565,870		$	584,768
Operating income		12,821			26,487			23,985			46,478
Identifiable assets		909,111			853,895	(2)(4)		909,111			853,895	(2)(4)
Capital expenditures		12,460			5,119			18,357			11,855
Depreciation		4,756			4,621			9,632			9,156

 (1)  Corporate and other revenues are comprised solely of the elimination of intersegment sales.  Launch vehicles segment revenues include $2.5 million and $0.3 million of intersegment sales in the quarters ended June 30, 2009 and 2008, respectively, and $3.3 million and $0.5 million of intersegment sales in the six months ended June 30, 2009 and 2008, respectively.  Satellites and space systems segment revenues include $0.6 million and $1.2 million of intersegment sales in the quarters ended June 30, 2009 and 2008, respectively, and $1.7 in the six months ended June 30, 2009 and 2008.

(2)  As of December 31, 2008.

(3)  Includes amounts attributable to a former business unit that was sold in the second quarter of 2008.

(4)  As adjusted (see Note 3).

(5)  Earnings Per Share

The computation of basic and diluted earnings per share (“EPS”) for income from continuing operations is as follows (in thousands, except per share amounts):

		Quarters Ended June 30,						Six Months Ended June 30,
Numerator		2009			2008			2009			2008
	Income from continuing operations	$	8,739		$	10,111		$	17,941		$	22,173
	Percentage allocated to shareholders (1)		98.5	%		98.2	%		98.5	%		98.2	%
	Numerator for basic and diluted earnings per share	$	8,608		$	9,929		$	17,672		$	21,774
Denominator
	Denominator for basic earnings per share - weighted-
	average shares outstanding		56,450			58,656			56,818			58,575
	Dilutive effect of stock options		733			1,240			748			1,279
	Dilutive effect of convertible notes		—			191			—			—
	Denominator for diluted earnings per share		57,183			60,087			57,566			59,854
Per share income from continuing operations
	Basic	$	0.15		$	0.17		$	0.31		$	0.37
	Diluted		0.15			0.17			0.31			0.36
_____________________________________
(1)	Basic weighted-average shares outstanding		56,450			58,656			56,818			58,575
	Basic weighted-average shares outstanding and unvested
	restricted share units expected to vest		57,326			59,720			57,693			59,652
	Percentage allocated to shareholders		98.5	%		98.2	%		98.5	%		98.2	%

The company adopted FASB FSP No. EITF 03-6-1, “Determining Whether Instruments Granted in Share-Based Payment Transactions Are Participating Securities,”in the first quarter of 2009.  This new accounting guidance requires that unvested share-based payment awards that have non-forfeitable rights to dividends or dividend equivalents be treated as a separate class of securities in calculating earnings per share.  The company’s unvested restricted stock units (“RSUs”) contain rights to receive non-forfeitable dividends, and thus are participating securities requiring the two-class method to be used for computing EPS.  The calculation of EPS shown above excludes the income attributable to the unvested RSUs from the numerator and excludes the impact of those units from the denominator.

For the quarter ended June 30, 2008, diluted weighted-average shares outstanding included the dilutive effect of the company’s $143.8 million of 2.4375% convertible notes, which was 0.2 million shares.  For the quarter and six months ended June 30, 2009, and for the six months ended June 30, 2008, diluted weighted-average shares outstanding excluded the effect of the company’s convertible notes, which were anti-dilutive.  Diluted weighted-average shares outstanding excluded 0.1 million of stock options and the effect of the RSUs, both of which were anti-dilutive for all periods presented.

(6)  Receivables

Receivables consisted of the following (in thousands):

	June 30,		December 31,
	2009		2008
Billed	$	69,694	$	51,156
Unbilled		148,046		151,955
Total	$	217,740	$	203,111

As of June 30, 2009 and December 31, 2008, unbilled receivables included $18.0 million and $18.7 million, respectively, of incentive fees on certain satellite contracts that become due incrementally over periods of up to 15 years, subject to the achievement of performance criteria.

Certain satellite contracts require the company to refund cash to the customer if performance criteria, which cover periods of up to 15 years, are not satisfied.  Through June 30, 2009, the company has recognized approximately $42 million of revenues under such contracts, a portion or all of which could be reversed in future periods if satellite performance criteria are not met.  The company generally procures insurance policies that the company believes would indemnify the company for satellite incentive fees that are not earned and for performance refund obligations.

Through June 30, 2009, the company has recognized approximately $26 million of estimated award fees on a contract that is subject to a final assessment at the conclusion of the contract, projected to occur in 2013.  If the final award fee assessment is different than the company’s current estimate of such fee assessment, the company will be required to record a revenue and profit adjustment.

In August 2008, a communications satellite constructed by the company was damaged by an unaffiliated third party at the launch site.  The company repaired the satellite and the satellite was successfully launched in the second quarter of 2009.  The full amount of the repair costs is expected to be reimbursed under an existing insurance policy.  Receivables at June 30, 2009 and December 31, 2008 included $1.0 million and $5.7 million, respectively, for unreimbursed costs.

(7)  Inventories

Total inventories were $44.9 million at June 30, 2009 and $33.4 million at December 31, 2008.  Substantially all of the company’s inventory consisted of component parts, raw materials and milestone payments for future delivery of component parts.

(8)  Investments

As of June 30, 2009, investments consisted of four auction-rate debt securities, two auction-rate equity securities and a preferred stock investment.  The amortized cost and fair value of these investments are as follows (in thousands):

	June 30, 2009			December 31, 2008
	Cost or Amortized Cost	Net Unrealized Gain (Loss)	Fair Value	Cost or Amortized Cost	Net Unrealized Loss	Fair Value
Debt	$12,900	$   200	$13,100	$12,900	$—	$12,900
Equity	2,500	(900)	1,600	3,800	—	3,800
Total	$15,400	$(700)	$14,700	$16,700	$—	$16,700

  These investments are classified as available for sale securities and non-current assets on the company’s balance sheet.  Contractual maturities for the debt securities are 16 years or greater and the remaining securities have no fixed maturity.  Auction-rate securities are normally structured to provide liquidity through an auction process that resets the applicable interest rate at predetermined calendar intervals.  This mechanism allows existing investors either to roll over or liquidate their holdings by selling such securities at par.  Since the third quarter of 2007 and through June 30, 2009, the auctions, which occur approximately every 28 days for the auction-rate securities held by the company, have not had sufficient buyers to cover investors’ sell orders, resulting in unsuccessful auctions.  These unsuccessful auctions result in a resetting of the interest rate paid on the securities until the next auction date, at which time the process is repeated.

The company has estimated the fair value of these securities using a discounted cash flow analysis which considered the following key inputs:  (i) the underlying structure of each security; (ii) the present value of future principal and interest payments discounted at rates considered to reflect current market conditions and the relevant risk associated with each security; and (iii) the time horizon that the market value of each security could return to its cost and be sold.  The discount rates used in the present value calculations are based on yields on U.S. Treasury securities with similar time horizons plus interest rate risk premiums that are intended to compensate for general market risk and the risk specific to each security.  The risk premiums are based upon current credit default swap pricing market data for similar or related securities or credit spreads for corporate bonds with similar credit ratings and similar maturities.  Under Statement of Financial Accounting Standards (“SFAS”) No. 157, “Fair Value Measurements,” such valuation assumptions are defined as Level 3 inputs.

The company has concluded that the unrealized loss recorded in connection with the equity securities is temporary because (i) the company believes that the decline in market value is due to current economic and market conditions; (ii) the company believes that the auction-rate securities continue to be of high credit quality, the securities’ issuers have investment-quality credit ratings and the issuers continue to pay interest when due; and (iii) the company intends to hold the auction-rate securities until a recovery in market value occurs.

In the second quarter and first six months of 2009, the company recorded other-than-temporary impairment charges of $0.6 million and $1.3 million, respectively, pertaining to the preferred stock investment.  The company determined to record these other-than-temporary impairment charges based on the company’s assessment that it is likely that the fair value of the investment will not fully recover in the foreseeable future given the duration, severity and continuing declining trend of the fair value of the security, as well as the uncertain financial condition and near-term prospects of the issuer.

The changes in fair value of the investments were recorded as follows (in thousands):

	Quarters Ended June 30,						Six Months Ended June 30,
	2009			2008			2009			2008
Debt Securities
Fair value at beginning of period	$	12,800		$	17,600		$	12,900		$	17,700
Temporary impairment (charges) credits, net		300			1,100			200			1,000
Other-than-temporary impairment charges		—			(1,400	)		—			(1,400	)
Net change in fair value		300			(300	)		200			(400	)
Fair value at end of period	$	13,100		$	17,300		$	13,100		$	17,300
Equity Securities
Fair value at beginning of period	$	1,900		$	7,900		$	3,800		$	10,300
Temporary impairment (charges) credits, net		300			6,600			(900	)		4,200
Other-than-temporary impairment charges		(600	)		(9,200	)		(1,300	)		(9,200	)
Net change in fair value		(300	)		(2,600	)		(2,200	)		(5,000	)
Fair value at end of period	$	1,600		$	5,300		$	1,600		$	5,300
Total
Fair value at beginning of period	$	14,700		$	25,500		$	16,700		$	28,000
Temporary impairment (charges) credits, net		600			7,700			(700	)		5,200
Other-than-temporary impairment charges		(600	)		(10,600	)		(1,300	)		(10,600	)
Net change in fair value		—			(2,900	)		(2,000	)		(5,400	)
Fair value at end of period	$	14,700		$	22,600		$	14,700		$	22,600

At this time it is uncertain if or when the liquidity issues relating to these investments will improve, and there can be no assurance that the market for auction-rate securities will stabilize.  The fair value of the auction-rate securities could change significantly in the future and the company may be required to record additional temporary or other-than-temporary impairment charges if there are further reductions in fair value in future periods.

The company adopted FASB FSP No. FAS 115-2 and FAS 124-2, “Recognition and Presentation of Other-Than-Temporary Impairments,” effective April 1, 2009.  This FSP requires other-than-temporary impairments for debt securities to be separated into (i) the amount representing the decrease in cash flows expected to be collected from a security (referred to as credit losses) which is recognized in earnings, and (ii) the amount related to other factors (referred to as noncredit losses) which is recognized in other comprehensive income.  This noncredit loss component of the impairment may only be classified in other comprehensive income if (a) the holder of the security concludes that it does not intend to sell the security, and (b) the holder concludes that it is more likely than not that the holder will not be required to sell the security before the security recovers its value.  If these conditions are not met, the noncredit loss must also be recognized in earnings.  When adopting the FSP, an entity is required to record a cumulative effect adjustment as of the beginning of the period of adoption to reclassify the noncredit component of a previously recognized other-than-temporary impairment from retained earnings to accumulated other comprehensive income.  The company determined that none of the other-than-temporary impairment charges previously recognized as of April 1, 2009 were attributable to noncredit losses; accordingly, the company did not reclassify any previously recognized other-than-temporary impairment losses from retained earnings to accumulated other comprehensive income.

(9)  Debt

Convertible Notes

In December 2006, the company issued $143.8 million of 2.4375% convertible senior subordinated notes due 2027 with interest payable semi-annually each January 15 and July 15.  Under certain circumstances, the convertible notes are convertible into cash, or a combination of cash and common stock at the company’s election, based on an initial conversion rate of 40.8513 shares of the company’s common stock per $1,000 in principal amount of the convertible notes (equivalent to an initial conversion price of approximately $24.48 per share).

At any time on or after January 21, 2014, the convertible notes are subject to redemption at the option of the company, in whole or in part, for cash equal to 100% of the principal amount of the convertible notes, plus unpaid interest, if any, accrued to the redemption date.

Holders of the convertible notes may require the company to repurchase the convertible notes, in whole or in part, on January 15, 2014, January 15, 2017 or January 15, 2022, or, if a “fundamental change” (as such term is defined in the indenture governing the convertible notes) occurs, for cash equal to 100% of the principal amount of the convertible notes, plus any unpaid interest, if any, accrued to the redemption date.

The fair value of the company’s convertible notes at June 30, 2009 and December 31, 2008 was estimated at $130.4 million and $133.2 million, respectively.  The fair value was determined based on market prices quoted by a broker-dealer.

Credit Facility

In August 2007, the company entered into a $100 million revolving secured credit facility (the “Credit Facility”), with the option to increase the amount of the Credit Facility up to $175 million to the extent that any one or more lenders commit to be a lender for such additional amount.  At the election of the company, loans under the Credit Facility bear interest at either (i) LIBOR plus a margin ranging from 0.75% to 1.25%, with the applicable margin varying according to the company’s total leverage ratio, or (ii) at a prime rate.  The Credit Facility expires in 2012 and is secured by substantially all of the company’s assets.  Up to $75 million of the Credit Facility may be reserved for letters of credit.  As of June 30, 2009, there were no borrowings under the Credit Facility, although $17 million of letters of credit were issued under the Credit Facility.  Accordingly, as of June 30, 2009, $83 million of the Credit Facility was available for borrowings.

Debt Covenants

Orbital’s Credit Facility contains covenants limiting its ability to, among other things, pay cash dividends, incur debt or liens, redeem or repurchase company stock, enter into transactions with affiliates, make investments, merge or consolidate with others or dispose of assets.  In addition, the Credit Facility contains financial covenants with respect to leverage and interest coverage.

(10)  Comprehensive Income

Comprehensive income consisted of the following (in thousands):

	Quarter Ended June 30,					Six Months Ended June 30,
	2009		2008			2009			2008
			(As Adjusted)						(As Adjusted)
Net income	$	8,739	$	25,080		$	17,941		$	38,091
Temporary investment impariment (charges) credits, net		600		7,700			(700	)		5,200
Defined benefit plans, net of tax		743		(377	)		425			(987	)
Total comprehensive income	$	10,082	$	32,403		$	17,666		$	42,304

Accumulated other comprehensive loss as of June 30, 2009 and December 31, 2008 was $3.1 million and $2.8 million, respectively.

(11)  Stock-Based Compensation

The following tables summarize information related to stock-based compensation transactions:

	Restricted Stock Units			Stock Options
	Number of Units	Weighted Average Measurement Date Fair Value		Number of Options		Weighted Average Eercise Prce
Outstanding at December 31, 2008	877,794		$23.01	2,500,233			$9.01
Granted(1)	32,510		17.90	—			—
Exercised	—		—	(48,901)			8.99
Vested	(21,446)		23.19	—			—
Forfeited	(10,845)		21.94	(7,500)			12.15
Expired	—		—	(80,800)			28.00
Outstanding at June 30, 2009	878,013		$22.83	2,363,032	(2)		$8.35

(1)   The fair value of restricted stock unit grants is determined based on the closing market price of Orbital’s common stock on the date of grant.  Such value is recognized as expense over the service period, net of estimated forfeitures.

(2)   The weighted average remaining contractual term is 3.04 years.

	Quarters Ended June 30,
(in millions)	2009	2008
Stock-based compensation expense	$2.7		$1.9
Income tax benefit related to stock-based compensation expense	0.9		0.6
Intrinsic value of options exercised computed as the market
price on the exercise date less the price paid to exercise the options	0.1		5.3
Cash received from exercise of options	0.3		4.0
Tax benefit recorded as credits to additional paid-in capital related
to stock-based compensation transactions	0.1		1.7
	Six Months Ended June 30,
(in millions)	2009	2008
Stock-based compensation expense	$5.1		$4.0
Income tax benefit related to stock-based compensation expense	1.7		1.2
Intrinsic value of options exercised computed as the market
price on the exercise date less the price paid to exercise the options	0.3		7.1
Cash received from exercise of options	0.4		5.4
Tax benefit recorded as credits to additional paid-in capital related
to stock-based compensation transactions	0.1		2.4

	As of
(in millions)	June 30, 2009
Shares of common stock available for grant under stock-based incentive plans		1.5
Aggregate intrinsic value of restricted stock units that are expected to vest		$13.3
Unrecognized compensation expense related to non-vested restricted stock units, expected to
be recognized over a weighted-average period of 1.34 years		10.1
Aggregate intrinsic value of stock options outstanding, all fully vested		16.2

(12)  Research and Development

In the first quarter of 2008, the company entered into an agreement with the National Aeronautics and Space Administration (“NASA”) to design, build and demonstrate a new space transportation system under a program called Commercial Orbital Transportation Services (“COTS”), for delivering cargo to the International Space Station.  Under the agreement, NASA has agreed to pay the company $170 million in cash milestone payments, partially funding Orbital’s project costs which are currently estimated to be approximately $270 million.

The COTS agreement is being accounted for as a best-efforts research and development cost-sharing arrangement.  As such, the amounts funded by NASA are recognized proportionally as an offset to the company’s COTS project research and development expenses.  In the quarter and six months ended June 30, 2009, $22.8 million and $37.5 million, respectively, of costs were incurred on the COTS program, $14.4 million and $26.3 million, respectively, of which were proportionally offset by NASA funding, resulting in net research and development expenses of $8.4 million and $11.2 million, respectively, recorded by the company.  Through June 30, 2008, $3.3 million of research and development costs were incurred on the COTS program, $2.9 million of which were funded by NASA.  As of June 30, 2009 and December 31, 2008, deferred revenue and customer advances on the accompanying balance sheet included $51.1 million and $37.4 million, respectively, of cash received from NASA that had not yet been recognized as an offset to research and development expenses.

(13)  Income Taxes

The company’s estimated annual effective income tax rates on income from continuing operations were 30.0% and 39.4% as of June 30, 2009 and 2008, respectively.  The tax rate in 2009 includes tax credits associated with the company’s research and development programs.  These tax credits are currently estimated to total approximately $4.8 million, net of reserves, for full year 2009.

(14)  Commitments and Contingencies

U.S. Government Contracts

The accuracy and appropriateness of costs charged to U.S. Government contracts are subject to regulation, audit and possible disallowance by the Defense Contract Audit Agency or other government agencies.  Accordingly, costs billed or billable to U.S. Government customers are subject to potential adjustment upon audit by such agencies.

Most of the company’s U.S. Government contracts are funded incrementally on a year-to-year basis.  Changes in government policies, priorities or funding levels through agency or program budget reductions by the U.S. Congress or executive agencies could materially adversely affect the company’s financial condition or results of operations.  Furthermore, contracts with the U.S. Government may be terminated or suspended by the U.S. Government at any time, with or without cause.  Such contract suspensions or terminations could result

 in unreimbursable expenses or charges or otherwise adversely affect the company’s financial condition and/or results of operations.

The company’s launch vehicles and advanced space programs business units are jointly engaged in a major product development program of a medium-capacity rocket called Taurus II that could substantially increase the payload capacity of the company’s space launch vehicle platforms.  Approximately $20.3 million and $6.3 million of the research and development expenses in the second quarter of 2009 and 2008, respectively, and $34.8 million and $11.7 million in the first six months of 2009 and 2008, respectively, were attributable to the Taurus II program.  The company believes that it will continue to incur significant research and development expenses in 2009 and 2010 on the Taurus II development effort.

The majority of our revenues are attributable to contracts with the U.S. Government and we believe that a majority of our research and development expenses are recoverable and billable under such contracts.  Charging practices relating to research and development and other costs that may be charged directly or indirectly to government contracts are subject to audit by U.S. Government agencies to determine if such costs are reasonable and allowable under government contracting regulations and accounting practices.  The company is currently engaged in discussions with U.S. Government agencies regarding the allowability of certain research and development costs incurred during 2009 in connection with the company’s Taurus II development program.  The company believes that such costs are allowable, although the U.S. Government has not yet made a determination.  During the first half of 2009, the company incurred $21.8 million of expenses that have been recorded as allowable costs.  If such costs were determined to be unallowable, the company could be required to record revenue and profit reductions in future periods.

Litigation

From time to time the company is party to certain litigation or other legal proceedings arising in the ordinary course of business.  Because of the uncertainties inherent in litigation, the company cannot predict whether the outcome of such litigation or other legal proceedings will have a material adverse effect on the company’s results of operations or financial condition.

(15)  Recent Accounting Pronouncements

As discussed in Note 8 above, on April 1, 2009, the company adopted FASB FSP No. FAS 115-2 and FAS 124-2, “Recognition and Presentation of Other-Than-Temporary Impairments.”  This FSP changed existing guidance for determining whether an impairment of debt securities is other-than-temporary.  The adoption of this FSP did not have a material impact on the company’s financial statements.

In April 2009, the FASB issued FSP No. FAS 157-4, “Determining Fair Value When the Volume and Level of Activity for the Asset or Liability Have Significantly Decreased and Identifying Transactions That Are Not Orderly.”  This FSP provides additional guidance on estimating fair value when the volume and level of activity for an asset or liability have

 significantly decreased in relation to normal market activity for the asset or liability.  The FSP also provides additional guidance on circumstances that may indicate that a transaction is not orderly.  The company adopted this FSP in the second quarter of 2009, and the adoption did not have a material impact on the company’s financial statements.

In April 2009, the FASB issued FSP No. FAS 107-1 and APB 28-1, “Interim Disclosures about Fair Value of Financial Instruments.”  This FSP enhances the disclosure for certain instruments under the scope of SFAS 157.  The company adopted this FSP in the second quarter of 2009.  The adoption did not have a material impact on the company’s disclosures.

In May 2009, the FASB issued SFAS No. 165, “Subsequent Events,” which establishes general standards of accounting for and disclosure of events that occur after the balance sheet date but before the financial statements are issued.  The company adopted SFAS No. 165 in the second quarter of 2009.  The adoption did not have a material impact on the company’s financial statements.

ITEM 2.  MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

With the exception of historical information, the matters discussed within this Item 2 and elsewhere in this Form 10-Q include forward-looking statements that involve risks and uncertainties, many of which are beyond our control.  Readers should be cautioned that a number of important factors, including those identified in our Annual Report on Form 10-K for the year ended December 31, 2008, may affect actual results and may cause actual results to differ materially from those anticipated or expected in any forward-looking statement.  Historical results of operations may not be indicative of future operating results.  We assume no obligation to update any forward-looking statements.

We develop and manufacture small- and medium-class rockets and space systems for commercial, military and civil government customers.  Our primary products and services include the following:

·   Launch Vehicles.  Rockets that are used as interceptor and target vehicles for missile defense systems, small- and medium-class space launch vehicles that place satellites into Earth orbit, and suborbital launch vehicles that place payloads into a variety of high-altitude trajectories.

·   Satellites and Space Systems.  Small- and medium-class spacecraft that are used to enable global and regional communications and broadcasting, to conduct space-related scientific research, to carry out interplanetary and other deep-space exploration missions, to enable national security applications, to collect imagery and other remotely-sensed data about the Earth and demonstrate new space technologies.

·   Advanced Space Programs.  Human-rated space systems for Earth-orbit and lunar exploration, advanced launch systems for medium-class satellites, and small satellites and satellite subsystems primarily used for national security space programs and to demonstrate new space technologies.

The following discussion should be read along with our 2008 Annual Report on Form 10-K filed with the Securities and Exchange Commission, and with the unaudited condensed consolidated financial statements included in this Form 10-Q.

Consolidated Results of Operations for the Quarters and Six Months Ended June 30, 2009 and 2008

Prior Period Adjustment For Adoption of New Accounting Standard - As discussed in Note 3 to the accompanying financial statements, our 2008 financial statements have been adjusted as required for the adoption of a new accounting standard pertaining to our convertible debt.  As a result of the new accounting standard, we recorded additional non-cash interest expense of $1.2 million and $1.1 million in the second quarter of 2009 and 2008, respectively. For the six months ended June 30, 2009 and 2008, we recorded additional non-cash interest expense of $2.4 million and $2.2 million, respectively.

Revenues - Our consolidated revenues were $270.1 million in the second quarter of 2009, a decrease of $31.1 million, or 10%, compared to the second quarter of 2008.  The decrease in revenue was primarily due to a decrease in contract activity on the Orion human space flight program and communications satellite programs.

Our consolidated revenues were $565.9 million in the first half of 2009, a decrease of $18.9 million, or 3%, compared to the first half of 2008.  The decrease in revenue was primarily due to decreased contract activity on the Orion program, partially offset by a significant increase in contract activity on missile defense programs in the launch vehicles segment.

Operating Income - Operating income decreased $13.7 million, or 52%, in the second quarter of 2009 compared to the second quarter of 2008 primarily due to a $5.2 million increase in unrecovered Taurus II launch vehicle research and development expenses, and a $4.7 million decrease in advanced space programs operating income, both occurring in the second quarter of 2009, and a $4.0 million favorable profit adjustment recorded in the second quarter of 2008 in connection with the closure of a U.S. Government investigation.  Our research and development expenses are generally recoverable under contracts with the U.S. Government.  For competitive reasons, we have established a self-imposed ceiling on the amount of research and development costs that we would recover under our U.S. Government contracts, although we believe that such costs would otherwise be allowable and recoverable.  In the second quarters of 2009 and 2008, our operating income was reduced by $6.9 million and $1.7 million, respectively, of unrecovered research and development expenses that exceeded our self-imposed ceiling on such costs.

Operating income decreased $22.5 million, or 48%, in the first half of 2009 compared to the first half of 2008 primarily due to a $9.1 million increase in unrecovered Taurus II launch vehicle research and development expenses and a $10.5 million decrease in advanced space programs operating income, both in the first half of 2009, and the $4.0 million favorable profit adjustment in 2008 mentioned above.  In the first half of 2009 and 2008, our operating income was reduced by $13.1 million and $3.9 million, respectively, of unrecovered research and development expenses that exceeded our self-imposed ceiling on such costs.

Research and Development Expenses - Research and development expenses are comprised of our product research and development activities.  Our research and development expenses were $30.7 million, or 11% of revenues, in the second quarter of 2009, a $20.5 million increase compared to $10.2 million, or 3% of revenues, in the second quarter of 2008.  For the first half of

 2009, research and development expenses totaled $49.7 million, or 9% of revenues, a $31.3 million increase compared to $18.4 million, or 3% of revenues, in the first half of 2008.  In each period, these increases were primarily due to our Taurus II launch vehicle development program discussed below.

Our launch vehicles and our advanced space programs business units are jointly engaged in a major product development program of a medium-capacity rocket called Taurus II that could substantially increase the payload capacity of our space launch vehicle platforms.  Approximately $20.3 million and $6.3 million of the research and development expenses in the second quarter of 2009 and 2008, respectively, and $34.8 million and $11.7 million in the first half of 2009 and 2008, respectively, were attributable to the Taurus II program.  We believe that we will continue to incur significant research and development expenses on the Taurus II development effort in the remainder of 2009 and through 2010.

The majority of our revenues are attributable to contracts with the U.S. Government and we believe that a majority of our research and development expenses are recoverable and billable under such contracts.  Charging practices relating to research and development and other costs that may be charged directly or indirectly to government contracts are subject to audit by U.S. Government agencies to determine if such costs are reasonable and allowable under government contracting regulations and accounting practices.  We are currently engaged in discussions with U.S. Government agencies regarding the allowability of research and development costs incurred during 2009 in connection with our Taurus II development program.  We believe that such costs are allowable, although the U.S. Government has not yet made a determination.  During the second quarter and first half of 2009, we incurred $13.4 million and $21.8 million, respectively, of expenses that have been recorded as allowable costs.  If such costs were determined to be unallowable, we could be required to record revenue and profit reductions in future periods.

In the first quarter of 2008, we entered into an agreement with the National Aeronautics and Space Administration (“NASA”) to design, build and demonstrate a new space transportation system under a program called Commercial Orbital Transportation Services (“COTS”) that has the capability to deliver cargo and supplies to the International Space Station.  Under the agreement, NASA has agreed to pay us $170 million in cash milestone payments, partially funding our project costs which are currently estimated to be approximately $270 million.

The COTS agreement is being accounted for as a best-efforts research and development cost-sharing arrangement.  As such, the amounts funded by NASA are recognized proportionally as an offset to our COTS project research and development expenses.  In the quarter and first six months ended June 30, 2009, $22.8 million and $37.5 million, respectively, of costs were incurred on the COTS program, $14.4 million and $26.3 million, respectively, of which were proportionally offset by NASA funding, resulting in net research and development expenses of $8.4 million and $11.2 million, respectively, recorded by us.  Through June 30, 2008, $3.3 million of research and development costs were incurred on the COTS program, $2.9 million of which were funded by NASA.  The net research and development expenses in 2009 and 2008 have been recorded as allowable costs under U.S. Government contracts.  As of June 30, 2009 and December 31, 2008, deferred revenue and customer advances on the accompanying balance sheet included $51.1 million and $37.4 million, respectively, of cash received from NASA that had not yet been recognized as an offset to research and development expenses.

Investment Impairment Charge - We recorded an other-than-temporary impairment charge of $0.6 million in the second quarter of 2009 and $1.3 million in the first half of 2009 to record the reduction in fair value of one of our investments.

Interest Income and Other - Interest income and other was $1.8 million in the second quarter of 2009, compared to $1.5 million in the second quarter of 2008.  This increase was primarily due to a $1.1 million gain recognized on the sale of an investment in the second quarter of 2009 partially offset by a reduction in interest income resulting from lower interest rates on our short-term cash investments.

Interest income and other increased to $7.4 million in the first half of 2009, compared to $3.8 million in the first half of 2008.  This increase is attributable to a $5.3 million insurance recovery recorded in connection with the launch failure of our Taurus XL rocket in February 2009 and the $1.1 million gain recognized on the sale of an investment in the second quarter of 2009.  These increases were offset by a $2.6 million decrease in interest income which resulting from lower interest rates on our short-term cash investments.

Interest Expense - Interest expense was $2.2 million in the second quarter of 2009 and 2008, and was $4.4 million and $4.3 million in the first half of 2009 and 2008, respectively, attributable to our $143.8 million of long-term debt.

Income Taxes - We recorded an income tax provision of $3.1 million and $5.0 million in the second quarter of 2009 and 2008, respectively, and $7.7 million and $13.2 million in the first half of 2009 and 2008, respectively.  The decrease in income tax expense was due to an increase in tax credits related to research and development programs.

Our annual effective income tax rate was 30.0% and 39.4% for the first half of 2009 and 2008, respectively.  The decrease in the effective tax rate is primarily due to the increase in research and development tax credits mentioned above.

Income from Discontinued Operations - In June 2008 we sold our transportation management systems (“TMS”) business unit and we recognized a $24.1 million pretax gain, or $14.8 million after-tax, reported in discontinued operations in 2008.  The after-tax income from operations related to TMS was $0.2 and $1.1 million in the second quarter and first half of 2008, respectively.

Net Income - Our net income for the second quarter of 2009 was $8.7 million, or $0.15 diluted earnings per share, compared to income from continuing operations of $10.1 million, or $0.17 diluted earnings per share in the second quarter of 2008.  Net income in the second quarter of 2008, including income from discontinued operations, was $25.1 million, or $0.41 diluted earnings per share.

Our net income for the first half of 2009 was $17.9 million, or $0.31 diluted earnings per share, compared to income from continuing operations of $22.2 million, or $0.36 diluted earnings per share in the first half of 2008.  Net income in the first half of 2008, including income from discontinued operations, was $38.1 million, or $0.62 diluted earnings per share.

Segment Results for the Quarters and Six Months Ended June 30, 2009 and 2008

Our products and services are grouped into three reportable segments: (i) launch vehicles; (ii) satellites and space systems; and (iii) advanced space programs.  Corporate office transactions that have not been attributed to a particular segment, as well as consolidating eliminations and adjustments, are reported in corporate and other.

The following tables of financial information and related discussion of the results of operations of our business segments are consistent with the presentation of segment information in Note 4 to the financial statements in this Form 10-Q.

Launch Vehicles

Launch vehicles segment operating results were as follows:

	Second Quarter								First Six Months
(in thousands, except percentages)	2009			2008			% Change		2009			2008			% Change
Revenues	$	117,072		$	115,024			2%	$	236,312		$	220,281			7%
Operating income		4,082			13,399			(70%)		8,368			21,014			(60%)
Operating margin		3.5	%		11.6	%				3.5	%		9.5	%

Segment Revenues - Launch vehicles segment revenues increased $2.0 million, or 2%, in the second quarter of 2009 compared to the second quarter of 2008 primarily due to increased activity on missile defense interceptor launch vehicles contracts partially offset by a decrease in suborbital program revenues in 2009 and a one-time revenue adjustment in 2008 discussed below.  Revenues from interceptor launch vehicles contracts increased $7.7 million due to an increase in contract activity on our Ground-based Midcourse Defense (“GMD”) and Kinetic Energy Interceptor (“KEI”) missile defense interceptor launch vehicle programs in 2009.  Our interceptor launch vehicle programs accounted for 53% and 47% of total launch vehicles segment revenues in 2009 and 2008, respectively.  During the second quarter of 2009, we were notified that the KEI program was terminated for convenience by the Missile Defense Agency. Suborbital revenues decreased as a result of a decrease in activity on our Abort Test Booster and missile defense target systems programs during the second quarter of 2009.  Launch vehicles segment revenues for the second quarter of 2008 included a one-time $4.0 million favorable revenue adjustment related to the closure of a U.S. Government investigation.

Launch vehicles segment revenues increased $16.0 million, or 7%, in the first half of 2009 compared to the first half of 2008 primarily due to increased activity on missile defense interceptor launch vehicle programs and space launch vehicle programs partially offset by a decrease in suborbital program revenues in 2009 and a one-time revenue adjustment in 2008.  Revenues from interceptor launch vehicles contracts increased $18.7 million primarily due to an

increase in contract activity on GMD and KEI programs in 2009.  Interceptor launch vehicle contracts accounted for 54% and 49% of total launch vehicles segment revenues in 2009 and 2008, respectively.  Space launch vehicle program revenues increased primarily due to an increase in Minotaur space launch program activity during the second quarter of 2009.  Suborbital revenues decreased primarily due to a decline in contract activity on target launch vehicle programs.  Launch vehicles segment revenues for the first half of 2008 included a one-time $4.0 million favorable revenue adjustment related to the closure of a U.S. Government investigation.

Segment Operating Income - Launch vehicles segment operating income decreased $9.3 million, or 70%, in the second quarter of 2009 compared to the second quarter of 2008 primarily due to a $5.2 million increase in unrecovered Taurus II launch vehicle research and development expenses and cost increases in 2009 associated with an anticipated launch delay of one of our space launch vehicle programs and the impact of a $4.0 million profit adjustment recorded in the second quarter of 2008 in connection with the closure of a U.S. Government investigation.  Interceptor launch vehicleoperating income increased primarily due to increased activity on the GMD and KEI programs.  Operating income from interceptor launch vehicles contracts was $8.6 million and $6.5 million in the second quarter of 2009 and 2008, respectively.

Launch vehicles segment operating income declined $12.6 million, or 60%, in the first half of 2009 compared to the first half of 2008 primarily due to a $9.1 million increase in unrecovered Taurus II launch vehicle research and development expenses and cost increases in 2009 associated with an anticipated launch delay of one of our space launch vehicle programs and the impact of a $4.0 million profit adjustment recorded in the second quarter of 2008 in connection with the closure of a U.S. Government investigation.  Interceptor launch vehicle operating income increased primarily due to increased activity on the GMD and KEI programs.  Operating income from interceptor launch vehicles contracts was $16.7 million and $13.2 million in the first half of 2009 and 2008, respectively.

Segment operating margins were lower in the second quarter and first half of 2009 due to the increase in unrecovered research and development expenditures and cost increases on certain space launch vehicle programs in 2009 and the impact of the $4.0 million profit adjustment recorded in the second quarter of 2008 in connection with the closure of a U.S. Government investigation.

Satellites and Space Systems

Satellites and space systems segment operating results were as follows:

	Second Quarter								First Six Months
(in thousands, except percentages)	2009			2008			% Change		2009			2008			% Change
Revenues	$	94,121		$	108,078			(13%)	$	204,278		$	214,480			(5%)
Operating income		7,734			7,578			2%		15,534			15,447			1%
Operating margin		8.2	%		7.0	%				7.6	%		7.2	%

Segment Revenues - Satellites and space systems segment revenues decreased $14.0 million, or 13%, in the second quarter of 2009 compared to the second quarter of 2008 primarily due to decreased activity on communications satellite contracts as a result of the substantial completion of certain satellites.  Communications satellite revenues accounted for 72% and 74% of total segment revenues in the second quarter of 2009 and 2008, respectively.

Satellites and space systems segment revenues decreased $10.2 million, or 5%, in the first half of 2009 compared to the first half of 2008 primarily due to decreased activity on communications satellite contracts as a result of the substantial completion of certain satellites.  Communications satellite revenues accounted for 74% of total segment revenues in the first half of each of 2009 and 2008.

Segment Operating Income - Satellites and space systems segment operating income increased marginally in the second quarter of 2009 compared to the second quarter of 2008.  The increase was due to cost reductions on certain communications satellite contracts in 2009, partially offset by the impact of $1.1 million of profit recorded in the second quarter of 2008 pertaining to the settlement of a technology satellite contract dispute.  Communications satellite contracts accounted for 75% and 59% of total segment operating income in the second quarter of 2009 and 2008, respectively.

Satellites and space systems segment operating income increased marginally in the first half of 2009 compared to the first half of 2008 primarily due to improved profit performance on communications satellite programs partially offset by the impact of the favorable $1.1 million adjustment in 2008 pertaining to the settlement of a technology satellite contract dispute mentioned above.  Communications satellite contracts accounted for 72% and 70% of total segment operating income in the first half of 2009 and 2008, respectively.

Segment operating margin increased in the second quarter and first six months of 2009 due to cost reductions and improved profit performance on certain communications satellite programs.

Advanced Space Programs

Advanced space programs segment operating results were as follows:

	Second Quarter								First Six Months
(in thousands, except percentages)	2009			2008			% Change		2009			2008			% Change
Revenues	$	62,053		$	79,719			(22%)	$	130,399		$	152,328			(14%)
Operating income		1,005			5,730			(82%)		83			10,572			(99%)
Operating margin		1.6	%		7.2	%				0.1	%		6.9	%

Segment Revenues - Advanced space programs segment revenues decreased $17.7 million, or 22%, in the second quarter of 2009 compared to the second quarter of 2008 primarily due to a reduction in contract activity on the Orion human spacecraft program partly offset by an increase in national security satellite program activity related to recently awarded contracts. The Orion program accounted for 52% and 75% of total segment revenues in the second quarter of 2009 and 2008, respectively.

Advanced space programs segment revenues decreased $21.9 million, or 14%, during the first half of 2009 compared to the first half of 2008 primarily due to a reduction in contract activity on the Orion human spacecraft program partly offset by an increase in national security satellite program activity related to recently awarded contracts.  The Orion program accounted for 51% and 79% of total segment revenues in the first half of 2009 and 2008, respectively.

Segment Operating Income - The advanced space programs segment operating income decreased $4.7 million, or 82%, in the second quarter of 2009 compared to the second quarter of 2008. This decrease resulted from a reduction in Orion program activity and cost increases on certain national security satellite programs.

Advanced space programs segment operating income decreased $10.5 million in the first half of 2009 compared to the first half of 2008 primarily as a result of a reduction in Orion program activity, cost increases on certain national security satellite programs and legal fees of approximately $1 million incurred in connection with a bid protest of the NASA Commercial Resupply Services contract awarded to us in late 2008.  The protest was denied by the U.S. Government Accountability Office during the second quarter of 2009 and the award to Orbital was upheld.  In July 2009, the same protestor filed a substantially similar bid protest with the U.S. Court of Federal Claims.  We are continuing to perform work under this contract in accordance with its terms.

This segment’s operating margin decreased significantly in the second quarter and first half of 2009 as a result of the decrease in segment operating income discussed above.

Corporate and Other

Corporate and other revenues were comprised solely of the elimination of intercompany revenues.  There was no corporate and other operating income in 2009.  Corporate and other operating income in 2008 consisted solely of corporate general and administrative expenses associated with a discontinued business unit that was sold in the second quarter of 2008.

Backlog

Firm backlog consists of aggregate contract values for firm product orders, excluding the portion previously included in revenues, and including government contract orders not yet funded and our estimate of potential award fees.  In the second quarter of 2009, the company was notified that the KEI program was terminated for convenience by the Missile Defense Agency, resulting in a $375 million reduction in firm backlog.Our firm backlog was approximately $1.6 billion and $2.1 billion at June 30, 2009 and December 31, 2008, respectively.  While there can be no assurance, we expect to convert approximately $500 million of the June 30, 2009 firm backlog into revenue during the remainder of 2009.

Total backlog includes firm backlog in addition to unexercised options, indefinite-quantity contracts and undefinitized orders and contract award selections.  The termination for convenience of the KEI program in the second quarter of 2009 resulted in a $695 million reduction in total backlog.Total backlog was approximately $4.9 billion at June 30, 2009 and $5.9 billion at December 31, 2008.

Liquidity and Capital Resources

Cash Flow from Operating Activities

Cash flow from operating activities in the first half of 2009 was $44.3 million as compared to $42.9 million in the first half of 2008.  The increase in operating cash flows was principally due to an increase in deferred revenues and customer advances associated with our advanced space programs segment partially offset by a reduction in accounts payable and accrued expenses.

Cash Flow from Investing Activities

Cash flow used in investing activities in the first half of 2009 was $17.0 million as compared to $31.3 million of cash flow provided by investing activities in the first half of 2008.  In the first half of 2009, we spent $18.4 million for capital expenditures, as compared to $11.9 million in the first half of 2008.  In addition, during the second quarter of 2009 we received $1.1 million from the sale of an investment.  In 2008, we received net proceeds of $39.9 million from the sale of our TMS business unit and $2.2 million from the sale of real estate.

Cash Flow from Financing Activities

During the first half of 2009 and 2008, we repurchased and retired 1.2 million and 0.6 million shares of our common stock at a cost of $16.7 million and $15.1 million, respectively.  During the first half of 2009 and 2008, we received $1.3 million and $6.2 million, respectively, from the issuance of common stock in connection with stock option exercises and employee stock plan purchases.

Convertible Notes - In December 2006, we issued $143.8 million of 2.4375% convertible senior subordinated notes due 2027 with interest payable semi-annually each January 15 and July 15.  The convertible notes are convertible into cash, or a combination of cash and common stock at our election, based on an initial conversion rate of 40.8513 shares of our common stock per $1,000 in principal amount of the convertible notes (equivalent to an initial conversion price of approximately $24.48 per share) under certain circumstances.

At any time on or after January 21, 2014, the convertible notes are subject to redemption at our option, in whole or in part, for cash equal to 100% of the principal amount of the convertible notes, plus unpaid interest, if any, accrued to the redemption date.

Holders of the convertible notes may require us to repurchase the convertible notes, in whole or in part, on January 15, 2014, January 15, 2017 or January 15, 2022, or, if a “fundamental change” (as such term is defined in the indenture governing the convertible notes) occurs, for cash equal to 100% of the principal amount of the convertible notes, plus any unpaid interest, if any, accrued to the redemption date.

Credit Facility - We have a $100 million revolving secured credit facility (the “Credit Facility”), with the option to increase the amount of the Credit Facility up to $175 million to the extent that any one or more lenders commit to be a lender for such additional amount.  At our election, loans under the Credit Facility bear interest at either (i) LIBOR plus a margin ranging from 0.75% to 1.25%, with the applicable margin varying according to our total leverage ratio, or (ii) at a prime rate.  The Credit Facility expires in 2012 and is secured by substantially all of our assets.  Up to $75 million of the Credit Facility may be reserved for letters of credit.  As of June 30, 2009, there were no borrowings under the Credit Facility, although $17 million of letters of credit were issued under the Credit Facility.  Accordingly, as of June 30, 2009, $83 million of the Credit Facility was available for borrowings.

Debt Covenants - Our Credit Facility contains covenants limiting our ability to, among other things, pay cash dividends, incur debt or liens, redeem or repurchase company stock, enter into transactions with affiliates, make investments, merge or consolidate with others or dispose of assets.  In addition, the Credit Facility contains financial covenants with respect to leverage and interest coverage.  As of June 30, 2009, we were in compliance with all of these covenants.

Available Cash and Future Funding

At June 30, 2009, we had $340.3 million of unrestricted cash and cash equivalents.  Management currently believes that available cash, cash expected to be generated from operations and borrowing capacity under our Credit Facility will be sufficient to fund our operating and capital expenditure requirements, including research and development expenditures, over the next twelve months.  However, there can be no assurance that this will be the case.  We believe that we will continue to incur significant costs as well as capital expenditures in 2009 through 2010 on the Taurus II and COTS research and development programs.  Our ability to incur additional debt is limited by the terms of our Credit Facility.  Additionally, significant unforeseen events such as termination of major orders or late delivery or failure of launch vehicle or satellite products could adversely affect our liquidity and results of operations.

As discussed in Note 8 to the accompanying financial statements, we currently hold investments in auction-rate securities and preferred stock with a cost basis of $34.5 million that have experienced a significant decline in fair value.  Given the sufficiency of our available cash and other funding sources as discussed above, we believe that we will not need, nor do we intend, to liquidate our investments in auction-rate securities in the foreseeable future.  Accordingly, we do not believe that any fluctuations in the fair values of these securities will have a significant impact on our liquidity.

In March 2009, our Board of Directors authorized a new program for the purchase of up to $50 million of our outstanding common stock over a 12-month period.  In the first half of 2009, we repurchased 342,301 shares of our common stock for $4.4 million under this program.  Accordingly, we may purchase up to an additional $45.6 million of our common stock pursuant to this repurchase program through March 5, 2010.

Off-Balance Sheet Arrangements

The conversion feature of our convertible notes is considered to be an off-balance sheet arrangement.  We do not have any material off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources.

Recent Accounting Pronouncements

On April 1, 2009, we adopted FASB FSP No. FAS 115-2 and FAS 124-2, “Recognition and Presentation of Other-Than-Temporary Impairments.”  This FSP changed existing guidance for determining whether an impairment of debt securities is other-than-temporary.  The adoption of this FSP did not have a material impact on the company’s financial statements.

In April 2009, the FASB issued FSP No. FAS 157-4, “Determining Fair Value When the Volume and Level of Activity for the Asset or Liability Have Significantly Decreased and Identifying Transactions That Are Not Orderly.”  This FSP provides additional guidance on estimating fair value when the volume and level of activity for an asset or liability have significantly decreased in relation to normal market activity for the asset or liability.  The FSP also provides additional guidance on circumstances that may indicate that a transaction is not orderly.  We adopted this FSP 157-4 in the second quarter of 2009, and the adoption did not have a material impact on our financial statements.

In April 2009, the FASB issued FSP No. FAS 107-1 and APB 28-1, “Interim Disclosures about Fair Value of Financial Instruments.”  This FSP enhances the disclosure for certain instruments under the scope of SFAS 157.  We adopted this FSP in the second quarter of 2009.  The adoption did not have a material impact on our disclosures.

In May 2009, the FASB issued SFAS No. 165, “Subsequent Events,” which establishes general standards of accounting for and disclosure of events that occur after the balance sheet date but before the financial statements are issued.  We adopted SFAS No. 165 in the second quarter of 2009.  The adoption did not have a material impact on our financial statements.

ITEM 3.   QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We believe that our market risk exposure is primarily related to the market value of certain investments that we hold as of June 30, 2009, changes in foreign currency exchange rates and interest rate risk.  We manage these market risks through our normal financing and operating activities and, when appropriate, through the use of derivative financial instruments.  We do not enter into derivatives for trading or other speculative purposes, nor do we use leveraged financial instruments.

Uncertainties in the Credit Markets

As discussed in Note 8 to the accompanying financial statements, we currently hold investments in auction-rate securities and preferred stock with a cost basis of $34.5 million that have experienced a decline in fair value to $14.7 million as of June 30, 2009.  As a result of liquidity issues in the global credit and capital markets, we may be required to record additional impairment charges if there are further reductions in the fair value of these investments in future periods.

Foreign Currency Exchange Rate Risk

We believe that the potential change in foreign currency exchange rates is not a substantial risk to us because the large majority of our business transactions are denominated in U.S. dollars.  At June 30, 2009, we had $2.7 million of receivables denominated in Japanese yen.

From time to time, we enter into forward exchange contracts to hedge against foreign currency fluctuations on receivables or expected payments denominated in foreign currency.  At June 30, 2009, we had no foreign currency forward exchange contracts.

Interest Rate Risk

We are exposed to changes in interest rates in the normal course of our business operations as a result of our ongoing investing and financing activities, which include debt as well as cash and cash equivalents.  As of June 30, 2009, we had $143.8 million of convertible senior subordinated notes with a fixed interest rate of 2.4375%.  Generally, the fair market value of our fixed interest rate debt will increase as interest rates fall and decrease as interest rates rise.  In addition, the fair value of our convertible notes is affected by our stock price.  The total estimated fair value of our convertible debt at June 30, 2009 was $130.4 million.  The fair value was determined based on market prices quoted by a broker-dealer.

We believe that exposure to market risk related to interest rate fluctuations for cash and cash equivalents are not significant.  As of June 30, 2009, a hypothetical 100 basis point change in interest rates would result in an annual change of approximately $3 million in interest income earned.

We assess our interest rate risks on a regular basis and do not currently use financial instruments to mitigate these risks.

Deferred Compensation Plan

We have an unfunded deferred compensation plan for senior managers and executive officers with a total liability balance of $7.2 million at June 30, 2009.  This liability is subject to fluctuation based upon the market value of the investment options selected by participants.

ITEM 4.   CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

An evaluation was performed under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities and Exchange Act of 1934, as amended) as of the end of the period covered by this report.  Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that these disclosure controls and procedures were effective.

Changes in Internal Controls Over Financial Reporting

There has been no change in our internal controls over financial reporting during our most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

PART II

OTHER INFORMATION

ITEM 1.                  LEGAL PROCEEDINGS

From time to time we are party to certain litigation or other legal proceedings arising in the ordinary course of business.  Because of the uncertainties inherent in litigation, we cannot predict whether the outcome of such litigation or other legal proceedings will have a material adverse effect on our results of operations or financial condition.

ITEM 1A.               RISK FACTORS

There are no material changes to the risk factors disclosed in the company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

(a)   None.

(b)   None.

 (c)   Issuer Purchases of Equity Securities.

The following table sets forth information regarding our repurchase of common stock during the quarter ended June 30, 2009.

Period	Total Number of Shares Purchased	Average Price Paid Per Share	Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs(1)	Maximum Number (or Approximate Dollar Value) of Shares That May Yet Be Purchased Under the Plans or Programs(1)
April 1, 2009  to April 30, 2009	162,600	$12.92	162,600	$45,635,237
May 1, 2009 to May 31, 2009	—	—	—	45,635,237
June 1, 2009 to June 30, 2009	—	—	—	45,635,237
TOTAL	162,600	$12.92	162,600	$45,635,237

(1)   On March 6, 2009, we announced a plan (“2009 Plan”), to repurchase up to $50 million of outstanding common stock through March 5, 2010, subject to certain conditions.  During the quarter ended June 30, 2009, we repurchased 162,600 shares under the 2009 Plan.  The purchases were made in open market transactions.

ITEM 3.                  DEFAULTS UPON SENIOR SECURITIES

Not applicable.

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

(a)   The annual meeting of stockholders of the Company was held on April 30, 2009.

(b)   Election of five directors, each serving for a three-year term ending in 2012:

Robert M. Hanisee

Votes:                     For:51,288,809

                                               Withheld:           778,682

James G. Roche

Votes:                     For:51,283,513

Withheld:          783,978

Harrison H. Schmitt

Votes:                     For:50,909,474

Withheld:         1,158,017

James R. Thompson

Votes:                     For:50,900,384

Withheld:         1,167,107

Scott L. Webster

Votes:                     For:37,289,495

Withheld:       14,777,996

Directors whose terms expire in 2010:

Edward F. Crawley

Lennard A. Fisk

Ronald T. Kadish

Garrett E. Pierce

Directors whose terms expire in 2011:

Robert J. Hermann

Janice I. Obuchowski

Frank L. Salizzoni

David W. Thompson

(c)   The following is a brief description of the other matter voted on at the meeting and the number of votes cast for, against or abstaining from the matter:

Ratification of PricewaterhouseCoopers LLP as the company’s independent registered public accounting firm for the fiscal year ending December 31, 2009.

Votes:                      For:                                           51,504,265

Against:                                         537,442

                Abstain:                                          25,784

ITEM 5.                  OTHER INFORMATION

Not applicable.

ITEM 6.                  EXHIBITS

(a)                      Exhibits - A complete listing of exhibits required is given in the Exhibit Index.

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:  July 29, 2009                                                                            By:   /s/ David W. Thompson

                                           David W. Thompson

                                                           Chairman and Chief Executive Officer

DATED:  July 29, 2009                                                                            By: /s/ Garrett E. Pierce

                           Garrett E. Pierce

                           Vice Chairman and Chief Financial Officer

EXHIBIT INDEX

The following exhibits are filed with this report unless otherwise indicated.

Exhibit No.	Description
3.1	Restated Certificate of Incorporation (incorporated by reference to Exhibit 4.1 to the company’s Registration Statement on Form S-3 (File Number 333-08769) filed and effective on July 25, 1996).
3.2	Amended and Restated Bylaws (incorporated by reference to Exhibit 3.2 to the company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2005).
3.3	Certificate of Amendment to Restated Certificate of Incorporation, dated April 29, 1997 (incorporated by reference to Exhibit 3.3 to the company’s Annual Report on Form 10-K for the fiscal year ended December 31, 1998).
3.4	Certificate of Amendment to Restated Certificate of Incorporation, dated April 30, 2003 (incorporated by reference to Exhibit 3.4 to the company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2003).
4.1	Form of Certificate of Common Stock (incorporated by reference to Exhibit 4.1 to the company’s Registration Statement on Form S-1 (File Number 33-33453) filed on February 9, 1990 and effective on April 24, 1990).
4.2	Indenture dated as of December 13, 2006, by and between Orbital Sciences Corporation and The Bank of New York, as Trustee (incorporated by reference to Exhibit 4.1 to the company’s Current Report on Form 8-K filed on December 13, 2006).
4.3	Form of 2.4375% Convertible Senior Subordinated Note due 2027 (incorporated by reference to Exhibit 4.2 to the company’s Current Report on Form 8-K filed on December 13, 2006).
31.1	Certification of Chairman and Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350) (transmitted herewith).
31.2	Certification of Vice Chairman and Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350) (transmitted herewith).
32.1	Written Statement of Chairman and Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350) (transmitted herewith).
32.2	Written Statement of Vice Chairman and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350) (transmitted herewith).