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<P align="center" style="font-size: 14pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>


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<P align="center" style="font-size: 18pt"><B>Form&nbsp;S-8</B>


<P align="center" style="font-size: 12pt"><B>REGISTRATION STATEMENT<BR>
UNDER THE SECURITIES ACT OF 1933</B>

<P align="center" style="font-size: 24pt"><B>Orbital Sciences Corporation</B>


<DIV align="center" style="font-size: 10pt"><HR size="1" noshade width="50%" align="center" color="#000000"></DIV>


<DIV align="center" style="font-size: 10pt">(Exact name of registrant as specified in its charter)</DIV>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
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<TR valign="bottom">
    <TD width="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Delaware</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>06-1209561</B></TD>
</TR>

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<TR valign="bottom">
    <TD align="center" valign="top">(State or other jurisdiction<BR>
of incorporation or organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(I.R.S. Employer Identification No.)</TD>
</TR>
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</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><B>21839 Atlantic Boulevard<BR>
Dulles, Virginia 20166</B>


<DIV align="center" style="font-size: 10pt"><HR size="1" noshade width="60%" align="center" color="#000000"></DIV>


<DIV align="center" style="font-size: 10pt">(Address, including zip code, of Registrant&#146;s principal executive offices)</DIV>



<P align="center" style="font-size: 10pt"><B>Orbital Sciences Corporation<BR>
2005 Stock Incentive Plan</B>


<DIV align="center" style="font-size: 10pt"><HR size="1" noshade width="60%" align="center" color="#000000">
(Full title of the plan)</DIV>



<P align="center" style="font-size: 10pt"><B>Leo Millstein<BR>
Senior Vice President, General Counsel and Secretary<BR>
Orbital Sciences Corporation<BR>
21839 Atlantic Boulevard<BR>
Dulles, Virginia 20166<BR>
(703)&nbsp;406-5000</B>


<DIV align="center" style="font-size: 10pt"><HR size="1" noshade width="60%" align="center" color="#000000">
(Name, address, including zip code, and telephone number, including area code, of agent for service)</DIV>



<P align="center" style="font-size: 10pt">Copies to:<BR>
<B>Eve N. Howard, Esq.<BR>
Hogan &#038; Hartson L.L.P.<BR>
555 Thirteenth Street, N.W.<BR>
Washington, D.C. 20004-1109<BR>
(202)&nbsp;637-5600</B>



<P align="center" style="font-size: 10pt">CALCULATION OF REGISTRATION FEE


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    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
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    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>

    <TD width="1%">&nbsp;</TD>
</TR><TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="21" style="border-bottom: 3px double #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Proposed</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Proposed</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="left"><DIV style="margin-left: 60px">Title of
each</DIV></TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Amount to be</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">maximum offering</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">maximum</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Amount of</TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="left"><DIV style="margin-left: 50px">class of
securities</DIV></TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">registered</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">price per share (a)</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">aggregate offering</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">registration fee (a)</TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="left"><DIV style="margin-left: 55px">to be
registered</DIV></TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">price (a)</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>

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    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
                    <TD style="border-top: 1px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock, par
value $.01 per
share</DIV></TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD nowrap colspan="3" align="center" style="border-top: 1px solid #000000">2,500,000 shares</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">9.345</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">23,362,500.00</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">2,749.77</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="21" style="border-top: 3px double #000000">&nbsp;</TD>
</TR>

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</DIV>

<P align="left" style="font-size: 10pt">(a)&nbsp;Estimated solely for the purpose of calculating the registration fee pursuant to Rule&nbsp;457 of
the Securities Act of 1933, as amended, on the basis of the average of the high and low prices per
share of the common stock, par value $0.01 per share, of Orbital Sciences Corporation, reported on
the New York Stock Exchange on May&nbsp;5, 2005, which is within five (5)&nbsp;business days prior to the
date of this registration statement.



<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>





<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

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<P align="center" style="font-size: 10pt"><B>EXPLANATORY NOTE</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This registration statement registers 2,500,000 shares of the common stock, par value $0.01
per share (the &#147;Common Stock&#148;), of Orbital Sciences Corporation (the &#147;Registrant&#148;) that may be
granted under the Orbital Sciences Corporation 2005 Stock Incentive Plan.


<P align="center" style="font-size: 10pt"><B>PART I</B>



<P align="center" style="font-size: 10pt"><B>INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The documents containing the information specified in Part&nbsp;I of Form S-8 will be sent or given
to employees as specified by Rule&nbsp;428(b)(1) of the Securities Act of 1933, as amended (the
&#147;Securities Act&#148;). Such documents need not be filed with the Securities and Exchange Commission
(the &#147;SEC&#148;) either as part of this registration statement or as prospectuses or prospectus
supplements pursuant to Rule&nbsp;424 of the Securities Act. These documents and the documents
incorporated by reference in this registration statement pursuant to Item&nbsp;3 of Part&nbsp;II of this
registration statement, taken together, constitute a prospectus that meets the requirements of
Section 10(a) of the Securities Act.


<P align="center" style="font-size: 10pt"><B>PART II</B>



<P align="center" style="font-size: 10pt"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>



<P align="left" style="font-size: 10pt"><B>Item&nbsp;3. Incorporation of Documents by Reference.</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents previously filed with the SEC are incorporated by reference in this
registration statement:


<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)&nbsp;&nbsp;</TD>
    <TD>The Registrant&#146;s Annual Report on Form 10-K for the fiscal year ended December&nbsp;31, 2004
filed on March&nbsp;4, 2005.</TD>
</TR>

<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)&nbsp;&nbsp;</TD>
    <TD>The Registrant&#146;s Quarterly Report on Form 10-Q for the quarter ended March&nbsp;31, 2005
filed on April&nbsp;25, 2005.</TD>
</TR>

<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)&nbsp;&nbsp;</TD>
    <TD>The Registrant&#146;s Current Reports on Form 8-K filed on January&nbsp;5, 2005, February&nbsp;28,
2005 and May&nbsp;2, 2005.</TD>
</TR>

<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)&nbsp;&nbsp;</TD>
    <TD>The description of the Registrant&#146;s common stock contained in the Registrant&#146;s
Registration Statement on Form 8-A filed on July&nbsp;6, 1998 (file number 001-14279).</TD>
</TR>

</TABLE>


<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition, all documents and reports filed by the Registrant subsequent to the date hereof
pursuant to Sections&nbsp;13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a
post-effective amendment to this registration statement which indicates that all securities offered
have been sold or which deregisters all securities remaining unsold, shall be deemed to be
incorporated by reference in this registration statement and to be part hereof from the date of
filing of such documents or reports. Any statement contained in a document incorporated or deemed
to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of
this registration statement to the extent that a


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

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<P align="left" style="font-size: 10pt">statement contained herein or in any other
subsequent filed document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or superseded shall not be
deemed, except as so modified or superseded, to constitute a part of this registration statement.



<P align="left" style="font-size: 10pt"><B>Item&nbsp;4. Description of Securities.</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.


<P align="left" style="font-size: 10pt"><B>Item&nbsp;5. Interests of Named Experts and Counsel.</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.


<P align="left" style="font-size: 10pt"><B>Item&nbsp;6. Indemnification of Directors and Officers.</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Under Section&nbsp;145 of the Delaware General Corporation Law (&#147;DGCL&#148;), a corporation may
indemnify its directors, officers, employees and agents and its former directors, officers,
employees and agents and those who serve, at the corporation&#146;s request, in such capacities with
another enterprise, against expenses (including attorneys&#146; fees), as well as judgments, fines and
settlements in nonderivative lawsuits, actually and reasonably incurred in connection with the
defense of any action, suit or proceeding in which they or any of them were or are made parties or
are threatened to be made parties by reason of their serving or having served in such capacity.
The DGCL provides, however, that such person must have acted in good faith and in a manner such
person reasonably believed to be in (or not opposed to) the best interests of the corporation and,
in the case of a criminal action, such person must have had no reasonable cause to believe his or
her conduct was unlawful. In addition, the DGCL does not permit indemnification in an action or
suit by or in the right of the corporation, where such person has been adjudged liable to the
corporation, unless, and only to the extent that, a court determines that such person fairly and
reasonably is entitled to indemnity for costs the court deems proper in light of liability
adjudication. Indemnity is mandatory for present and former directors and officers to the extent
such director or officer has been successful on the merits or otherwise in the defense of any
action, suit or proceeding or in the defense of a claim, issue or matter therein.


<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Restated Certificate of Incorporation of the Registrant (the &#147;Registrant Certificate&#148;)
contains provisions that provide that no director of the Registrant shall be liable to the
Registrant or its stockholders for monetary damages for breach of fiduciary duty as a director,
except to the extent that exculpation from liability is not permitted under the DGCL as in effect
at the time such liability is determined. The Registrant Certificate further provides that the
Registrant shall, to the maximum extent permitted by the DGCL as presently in effect (except for
Section 145(f) of the DGCL), indemnify and upon request, advance expenses to, any person who is or
was a party or is threatened to be made party to any threatened, pending or completed action, suit,
proceeding or claim, whether civil, criminal, administrative or investigative, by reason of the
fact that such person is or was or has agreed to be a director or officer of the Registrant or
while a director or officer is or was serving at the request of the Registrant as a director,
officer, partner, trustee, employee or agent of any corporation, partnership, joint venture, trust
or other enterprise, provided, however, that the Registrant shall not be required to indemnify or
advance expenses to any person in connection with any action, suit, proceeding, claim or
counterclaim initiated by or on behalf of such person.


<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant has also entered into substantially identical indemnification agreements (the
&#147;Indemnification Agreements&#148;) with each of its directors and certain of its officers and senior
managers.


<P align="center" style="font-size: 10pt">2
</DIV>

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<P align="left" style="font-size: 10pt">The Indemnification Agreements, among other things, provide for the indemnification of
each indemnitee against all expenses (including attorneys&#146; fees), as well as judgments, fines and
settlements in nonderivative lawsuits, actually and reasonably incurred by the indemnitee because
he or she was, is or is threatened to be made a party to any completed, pending or threatened
action, suit or proceeding by reason of the fact that he or she was a director, officer, employee
or agent of the Registrant or any of its affiliates, or was serving, at the Registrant&#146;s request,
in such capacities with another enterprise. Under the Indemnification Agreements, the indemnitee
will be indemnified so long as he or she acted in good faith and in a manner reasonably believed by
him or her to be in or not opposed to the Registrant&#146;s best interest and, in the case of a criminal
action, had no reasonable cause to believe his or her conduct was unlawful. In addition, the
Indemnification Agreements do not permit indemnification in an action or suit by or in the right of
the Registrant, where such indemnitee has been adjudged liable to the Registrant, unless, and only
to the extent that, the court in which such action was brought determines that the indemnitee is
entitled to be indemnified. The Indemnification Agreements further provide that the
indemnification thereunder is not exclusive of any other rights the indemnitee may have under the
Registrant Certificate or any agreement or vote of stockholders and that the Registrant Certificate
may not be amended to adversely affect the rights of the indemnitee.



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant has also obtained directors and officers liability insurance against certain
liabilities, including liabilities under the Securities Act.


<P align="left" style="font-size: 10pt"><B>Item&nbsp;7. Exemption from Registration Claimed.</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.


<P align="left" style="font-size: 10pt"><B>Item&nbsp;8. Exhibits.</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following exhibits are filed as a part of this registration statement:

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

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<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Orbital Sciences Corporation 2005 Stock Incentive Plan (incorporated by reference to
Exhibit&nbsp;10.1 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed on May&nbsp;2, 2005).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Stock Unit Agreement under the 2005 Stock Incentive Plan (incorporated by
reference to Exhibit&nbsp;10.2 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed on May&nbsp;2,
2005).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Certificate of Common Stock (incorporated by reference to Exhibit&nbsp;4.1 to the
Registrant&#146;s Registration Statement on Form&nbsp;S-1 (File Number 33-33453) filed on February&nbsp;9,
1990 and effective on April&nbsp;24, 1990).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Leo Millstein, Senior Vice President, General Counsel and Secretary of
Orbital Sciences Corporation (filed herewith).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Leo Millstein, Senior Vice President, General Counsel and Secretary of
Orbital Sciences Corporation (contained in Exhibit&nbsp;5.1).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of PricewaterhouseCoopers LLP (filed herewith).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>

<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of Attorney (contained on the signature pages).</TD>
</TR>

<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">3
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<P align="left" style="font-size: 10pt"><B>Item&nbsp;9. Undertakings.</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;The undersigned Registrant hereby undertakes:


<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="5%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(1)&nbsp;&nbsp;</TD>
    <TD>To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:</TD>
</TR>

</TABLE>


<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="8%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(i)&nbsp;&nbsp;</TD>
    <TD>To include any prospectus required by Section&nbsp;10(a)(3) of the Securities Act;</TD>
</TR>

<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(ii)&nbsp;&nbsp;</TD>
    <TD>To reflect in the prospectus any facts or events arising after the
effective date of the registration statement (or the most recent post-effective
amendment thereof) which, individually or in the aggregate, represent a fundamental
change in the information set forth in the registration statement. Notwithstanding
the foregoing, any increase or decrease in volume of securities offered (if the
total dollar value of securities offered would not exceed that which was
registered) and any deviation from the low or high end of the estimated maximum
offering range may be reflected in the form of prospectus filed with the SEC
pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price
represent no more than a 20% change in the maximum aggregate offering price set
forth in the &#147;Calculation of Registration Fee&#148; table in the effective registration
statement; and</TD>
</TR>

<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(iii)&nbsp;&nbsp;</TD>
    <TD>To include any material information with respect to the plan of
distribution not previously disclosed in the registration statement or any material
change to such information in the registration statement;</TD>
</TR>

</TABLE>



<P align="left" style="margin-left:3%; font-size: 10pt"><I>provided, however</I>, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the registration
statement is on Form S-3, Form S-8 or Form F-3, and the information required to be included
in a post-effective amendment by those paragraphs is contained in periodic reports filed
with or furnished to the SEC by the Registrant pursuant to Section&nbsp;13 or Section 15(d) of
the Exchange Act that are incorporated by reference in the registration statement.


<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="5%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(2)&nbsp;&nbsp;</TD>
    <TD>That, for the purpose of determining any liability under the Securities Act,
each such post-effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities at that
time shall be deemed to be the initial bona fide offering thereof.</TD>
</TR>

<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="5%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(3)&nbsp;&nbsp;</TD>
    <TD>To remove from registration by means of a post-effective amendment any of the
securities being registered which remain unsold at the termination of the offering.</TD>
</TR>

</TABLE>


<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;The undersigned Registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the Registrant&#146;s annual report pursuant to
Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an
employee benefit plan&#146;s annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the registration statement shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such securities at that
time shall be deemed to be the initial bona fide offering thereof.


<P align="center" style="font-size: 10pt">4
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;Insofar as indemnification for liabilities arising under the Securities Act may be
permitted to directors, officers, and controlling persons of the registrant pursuant to the
foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the SEC
such indemnification is against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such liabilities (other than
the payment by the Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or proceeding) is asserted
by such director, officer or controlling person in connection with the securities being registered,
the Registrant will, unless in the opinion of its counsel the matter has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.


<P align="center" style="font-size: 10pt">5
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<P align="center" style="font-size: 10pt"><B>SIGNATURES</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act, the Registrant certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has
duly caused this registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the County of Loudoun, the Commonwealth of Virginia, on the 11<SUP style="font-size: 85%; vertical-align: text-top">th</SUP> day
of May, 2005.

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="45%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="10%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">ORBITAL SCIENCES CORPORATION</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">BY:
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ <I>David W. Thompson</I></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">David W. Thompson, Chairman of the</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Board and Chief Executive Officer</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><B>POWER OF ATTORNEY</B>



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each person whose signature appears below constitutes and appoints David W. Thompson and Leo
Millstein, or any of them, their true and lawful attorneys-in-fact and agents, with full power of
substitution and capacities, for them and in their name, place and stead, in any and all
capacities, to sign any amendments (including post-effective amendments) to this Registration
Statement, and to file the same, with all exhibits thereto, and other documents in connection
therewith, with the SEC, granting unto said attorneys-in-fact as agents full power and authority to
perform each and every act and thing requisite and necessary to be done in and about the premises,
as fully to all intents and purposes as they might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.


<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act, this registration statement has been
signed below on May&nbsp;11, 2005 by the following persons in the capacities indicated.

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="45%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="45%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Signature:</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Title:</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>

<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ David W. Thompson</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Chairman of the Board and Chief</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">David W. Thompson
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Executive Officer, Director</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(Principal Executive Officer)</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ James R. Thompson</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Vice Chairman, President and Chief</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">James R. Thompson
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Operating Officer, Director</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ Garrett E. Pierce</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Vice Chairman and Chief</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Garrett E. Pierce
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Financial Officer, Director</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(Principal Financial Officer)</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ Hollis M. Thompson</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Vice President and Controller</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Hollis M. Thompson
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(Principal Accounting Officer)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">6
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="45%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="45%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Signature:</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Title:</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ Edward F. Crawley</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Edward F. Crawley</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"  style="border-bottom: 1px solid #000000"><I>/s/ Daniel J. Fink</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Daniel J. Fink</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ Lennard A. Fisk</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Lennard A. Fisk</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ Robert M. Hanisee</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Robert M. Hanisee</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"  style="border-bottom: 1px solid #000000"><I>/s/ Robert J. Hermann</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Robert J. Hermann</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ Janice I. Obuchowski</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Janice I. Obuchowski</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ Frank L. Salizzoni</I></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Frank L. Salizzoni</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ Harrison H. Schmitt</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Harrison H. Schmitt</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" style="border-bottom: 1px solid #000000"><I>/s/ Scott L. Webster</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Scott L. Webster</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">7
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<P align="center" style="font-size: 10pt"><B>EXHIBIT INDEX</B>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Orbital Sciences Corporation 2005 Stock Incentive Plan
(incorporated by reference to Exhibit&nbsp;10.1 to the
Registrant&#146;s Current Report on Form&nbsp;8-K filed on May&nbsp;2,
2005).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Stock Unit Agreement under the 2005 Stock Incentive
Plan (incorporated by reference to Exhibit&nbsp;10.2 to the
Registrant&#146;s Current Report on Form&nbsp;8-K filed on May&nbsp;2,
2005).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Certificate of Common Stock (incorporated by
reference to Exhibit&nbsp;4.1 to the Registrant&#146;s Registration
Statement on Form&nbsp;S-1 (File Number 33-33453) filed on
February&nbsp;9, 1990 and effective on April&nbsp;24, 1990).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Leo Millstein, Senior Vice President, General
Counsel and Secretary of Orbital Sciences Corporation
(filed herewith).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Leo Millstein, Senior Vice President, General
Counsel and Secretary of Orbital Sciences Corporation
(contained in Exhibit&nbsp;5.1).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of PricewaterhouseCoopers LLP (filed herewith).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of Attorney (contained on the signature pages).</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<P align="center" style="font-size: 10pt">8
</DIV>
</BODY>
</HTML>
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sv8
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form S-8
REGISTRATION STATEMENT
UNDER THE SECURITIES ACT OF 1933
Orbital Sciences Corporation
(Exact name of registrant as specified in its charter)
Delaware
06-1209561
(State or other jurisdiction
of incorporation or organization)
(I.R.S. Employer Identification No.)
21839 Atlantic Boulevard
Dulles, Virginia 20166
(Address, including zip code, of Registrant's principal executive offices)
Orbital Sciences Corporation
2005 Stock Incentive Plan
(Full title of the plan)
Leo Millstein
Senior Vice President, General Counsel and Secretary
Orbital Sciences Corporation
21839 Atlantic Boulevard
Dulles, Virginia 20166
(703) 406-5000
(Name, address, including zip code, and telephone number, including area code, of agent for service)
Copies to:
Eve N. Howard, Esq.
Hogan & Hartson L.L.P.
555 Thirteenth Street, N.W.
Washington, D.C. 20004-1109
(202) 637-5600
CALCULATION OF REGISTRATION FEE
Proposed
Proposed
Title of
each
Amount to be
maximum offering
maximum
Amount of
class of
securities
registered
price per share (a)
aggregate offering
registration fee (a)
to be
registered
price (a)
Common Stock, par
value $.01 per
share
2,500,000 shares
$
9.345
$
23,362,500.00
$
2,749.77
(a) Estimated solely for the purpose of calculating the registration fee pursuant to Rule 457 of
the Securities Act of 1933, as amended, on the basis of the average of the high and low prices per
share of the common stock, par value $0.01 per share, of Orbital Sciences Corporation, reported on
the New York Stock Exchange on May 5, 2005, which is within five (5) business days prior to the
date of this registration statement.
EXPLANATORY NOTE
This registration statement registers 2,500,000 shares of the common stock, par value $0.01
per share (the "Common Stock"), of Orbital Sciences Corporation (the "Registrant") that may be
granted under the Orbital Sciences Corporation 2005 Stock Incentive Plan.
PART I
INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS
The documents containing the information specified in Part I of Form S-8 will be sent or given
to employees as specified by Rule 428(b)(1) of the Securities Act of 1933, as amended (the
"Securities Act"). Such documents need not be filed with the Securities and Exchange Commission
(the "SEC") either as part of this registration statement or as prospectuses or prospectus
supplements pursuant to Rule 424 of the Securities Act. These documents and the documents
incorporated by reference in this registration statement pursuant to Item 3 of Part II of this
registration statement, taken together, constitute a prospectus that meets the requirements of
Section 10(a) of the Securities Act.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
The following documents previously filed with the SEC are incorporated by reference in this
registration statement:
(a)
The Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 2004
filed on March 4, 2005.
(b)
The Registrant's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005
filed on April 25, 2005.
(c)
The Registrant's Current Reports on Form 8-K filed on January 5, 2005, February 28,
2005 and May 2, 2005.
(d)
The description of the Registrant's common stock contained in the Registrant's
Registration Statement on Form 8-A filed on July 6, 1998 (file number 001-14279).
In addition, all documents and reports filed by the Registrant subsequent to the date hereof
pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a
post-effective amendment to this registration statement which indicates that all securities offered
have been sold or which deregisters all securities remaining unsold, shall be deemed to be
incorporated by reference in this registration statement and to be part hereof from the date of
filing of such documents or reports. Any statement contained in a document incorporated or deemed
to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of
this registration statement to the extent that a
statement contained herein or in any other
subsequent filed document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or superseded shall not be
deemed, except as so modified or superseded, to constitute a part of this registration statement.
Item 4. Description of Securities.
Not applicable.
Item 5. Interests of Named Experts and Counsel.
Not applicable.
Item 6. Indemnification of Directors and Officers.
Under Section 145 of the Delaware General Corporation Law ("DGCL"), a corporation may
indemnify its directors, officers, employees and agents and its former directors, officers,
employees and agents and those who serve, at the corporation's request, in such capacities with
another enterprise, against expenses (including attorneys' fees), as well as judgments, fines and
settlements in nonderivative lawsuits, actually and reasonably incurred in connection with the
defense of any action, suit or proceeding in which they or any of them were or are made parties or
are threatened to be made parties by reason of their serving or having served in such capacity.
The DGCL provides, however, that such person must have acted in good faith and in a manner such
person reasonably believed to be in (or not opposed to) the best interests of the corporation and,
in the case of a criminal action, such person must have had no reasonable cause to believe his or
her conduct was unlawful. In addition, the DGCL does not permit indemnification in an action or
suit by or in the right of the corporation, where such person has been adjudged liable to the
corporation, unless, and only to the extent that, a court determines that such person fairly and
reasonably is entitled to indemnity for costs the court deems proper in light of liability
adjudication. Indemnity is mandatory for present and former directors and officers to the extent
such director or officer has been successful on the merits or otherwise in the defense of any
action, suit or proceeding or in the defense of a claim, issue or matter therein.
The Restated Certificate of Incorporation of the Registrant (the "Registrant Certificate")
contains provisions that provide that no director of the Registrant shall be liable to the
Registrant or its stockholders for monetary damages for breach of fiduciary duty as a director,
except to the extent that exculpation from liability is not permitted under the DGCL as in effect
at the time such liability is determined. The Registrant Certificate further provides that the
Registrant shall, to the maximum extent permitted by the DGCL as presently in effect (except for
Section 145(f) of the DGCL), indemnify and upon request, advance expenses to, any person who is or
was a party or is threatened to be made party to any threatened, pending or completed action, suit,
proceeding or claim, whether civil, criminal, administrative or investigative, by reason of the
fact that such person is or was or has agreed to be a director or officer of the Registrant or
while a director or officer is or was serving at the request of the Registrant as a director,
officer, partner, trustee, employee or agent of any corporation, partnership, joint venture, trust
or other enterprise, provided, however, that the Registrant shall not be required to indemnify or
advance expenses to any person in connection with any action, suit, proceeding, claim or
counterclaim initiated by or on behalf of such person.
The Registrant has also entered into substantially identical indemnification agreements (the
"Indemnification Agreements") with each of its directors and certain of its officers and senior
managers.
2
The Indemnification Agreements, among other things, provide for the indemnification of
each indemnitee against all expenses (including attorneys' fees), as well as judgments, fines and
settlements in nonderivative lawsuits, actually and reasonably incurred by the indemnitee because
he or she was, is or is threatened to be made a party to any completed, pending or threatened
action, suit or proceeding by reason of the fact that he or she was a director, officer, employee
or agent of the Registrant or any of its affiliates, or was serving, at the Registrant's request,
in such capacities with another enterprise. Under the Indemnification Agreements, the indemnitee
will be indemnified so long as he or she acted in good faith and in a manner reasonably believed by
him or her to be in or not opposed to the Registrant's best interest and, in the case of a criminal
action, had no reasonable cause to believe his or her conduct was unlawful. In addition, the
Indemnification Agreements do not permit indemnification in an action or suit by or in the right of
the Registrant, where such indemnitee has been adjudged liable to the Registrant, unless, and only
to the extent that, the court in which such action was brought determines that the indemnitee is
entitled to be indemnified. The Indemnification Agreements further provide that the
indemnification thereunder is not exclusive of any other rights the indemnitee may have under the
Registrant Certificate or any agreement or vote of stockholders and that the Registrant Certificate
may not be amended to adversely affect the rights of the indemnitee.
The Registrant has also obtained directors and officers liability insurance against certain
liabilities, including liabilities under the Securities Act.
Item 7. Exemption from Registration Claimed.
Not applicable.
Item 8. Exhibits.
The following exhibits are filed as a part of this registration statement:
Exhibit
Number
Description
4.1
Orbital Sciences Corporation 2005 Stock Incentive Plan (incorporated by reference to
Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on May 2, 2005).
4.2
Form of Stock Unit Agreement under the 2005 Stock Incentive Plan (incorporated by
reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed on May 2,
2005).
4.3
Form of Certificate of Common Stock (incorporated by reference to Exhibit 4.1 to the
Registrant's Registration Statement on Form S-1 (File Number 33-33453) filed on February 9,
1990 and effective on April 24, 1990).
5.1
Opinion of Leo Millstein, Senior Vice President, General Counsel and Secretary of
Orbital Sciences Corporation (filed herewith).
23.1
Consent of Leo Millstein, Senior Vice President, General Counsel and Secretary of
Orbital Sciences Corporation (contained in Exhibit 5.1).
23.2
Consent of PricewaterhouseCoopers LLP (filed herewith).
24.1
Power of Attorney (contained on the signature pages).
3
Item 9. Undertakings.
(a) The undersigned Registrant hereby undertakes:
(1)
To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:
(i)
To include any prospectus required by Section 10(a)(3) of the Securities Act;
(ii)
To reflect in the prospectus any facts or events arising after the
effective date of the registration statement (or the most recent post-effective
amendment thereof) which, individually or in the aggregate, represent a fundamental
change in the information set forth in the registration statement. Notwithstanding
the foregoing, any increase or decrease in volume of securities offered (if the
total dollar value of securities offered would not exceed that which was
registered) and any deviation from the low or high end of the estimated maximum
offering range may be reflected in the form of prospectus filed with the SEC
pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price
represent no more than a 20% change in the maximum aggregate offering price set
forth in the "Calculation of Registration Fee" table in the effective registration
statement; and
(iii)
To include any material information with respect to the plan of
distribution not previously disclosed in the registration statement or any material
change to such information in the registration statement;
provided, however
, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the registration
statement is on Form S-3, Form S-8 or Form F-3, and the information required to be included
in a post-effective amendment by those paragraphs is contained in periodic reports filed
with or furnished to the SEC by the Registrant pursuant to Section 13 or Section 15(d) of
the Exchange Act that are incorporated by reference in the registration statement.
(2)
That, for the purpose of determining any liability under the Securities Act,
each such post-effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities at that
time shall be deemed to be the initial bona fide offering thereof.
(3)
To remove from registration by means of a post-effective amendment any of the
securities being registered which remain unsold at the termination of the offering.
(b) The undersigned Registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the Registrant's annual report pursuant to
Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the registration statement shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such securities at that
time shall be deemed to be the initial bona fide offering thereof.
4
(c) Insofar as indemnification for liabilities arising under the Securities Act may be
permitted to directors, officers, and controlling persons of the registrant pursuant to the
foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the SEC
such indemnification is against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such liabilities (other than
the payment by the Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or proceeding) is asserted
by such director, officer or controlling person in connection with the securities being registered,
the Registrant will, unless in the opinion of its counsel the matter has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.
5
SIGNATURES
Pursuant to the requirements of the Securities Act, the Registrant certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has
duly caused this registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the County of Loudoun, the Commonwealth of Virginia, on the 11
th
day
of May, 2005.
ORBITAL SCIENCES CORPORATION
BY:
/s/
David W. Thompson
David W. Thompson, Chairman of the
Board and Chief Executive Officer
POWER OF ATTORNEY
Each person whose signature appears below constitutes and appoints David W. Thompson and Leo
Millstein, or any of them, their true and lawful attorneys-in-fact and agents, with full power of
substitution and capacities, for them and in their name, place and stead, in any and all
capacities, to sign any amendments (including post-effective amendments) to this Registration
Statement, and to file the same, with all exhibits thereto, and other documents in connection
therewith, with the SEC, granting unto said attorneys-in-fact as agents full power and authority to
perform each and every act and thing requisite and necessary to be done in and about the premises,
as fully to all intents and purposes as they might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities Act, this registration statement has been
signed below on May 11, 2005 by the following persons in the capacities indicated.
Signature:
Title:
/s/ David W. Thompson
Chairman of the Board and Chief
David W. Thompson
Executive Officer, Director
(Principal Executive Officer)
/s/ James R. Thompson
Vice Chairman, President and Chief
James R. Thompson
Operating Officer, Director
/s/ Garrett E. Pierce
Vice Chairman and Chief
Garrett E. Pierce
Financial Officer, Director
(Principal Financial Officer)
/s/ Hollis M. Thompson
Vice President and Controller
Hollis M. Thompson
(Principal Accounting Officer)
6
Signature:
Title:
/s/ Edward F. Crawley
Director
Edward F. Crawley
/s/ Daniel J. Fink
Director
Daniel J. Fink
/s/ Lennard A. Fisk
Director
Lennard A. Fisk
/s/ Robert M. Hanisee
Director
Robert M. Hanisee
/s/ Robert J. Hermann
Director
Robert J. Hermann
/s/ Janice I. Obuchowski
Director
Janice I. Obuchowski
/s/ Frank L. Salizzoni
Director
Frank L. Salizzoni
/s/ Harrison H. Schmitt
Director
Harrison H. Schmitt
/s/ Scott L. Webster
Director
Scott L. Webster
7
EXHIBIT INDEX
Exhibit
Number
Description
4.1
Orbital Sciences Corporation 2005 Stock Incentive Plan
(incorporated by reference to Exhibit 10.1 to the
Registrant's Current Report on Form 8-K filed on May 2,
2005).
4.2
Form of Stock Unit Agreement under the 2005 Stock Incentive
Plan (incorporated by reference to Exhibit 10.2 to the
Registrant's Current Report on Form 8-K filed on May 2,
2005).
4.3
Form of Certificate of Common Stock (incorporated by
reference to Exhibit 4.1 to the Registrant's Registration
Statement on Form S-1 (File Number 33-33453) filed on
February 9, 1990 and effective on April 24, 1990).
5.1
Opinion of Leo Millstein, Senior Vice President, General
Counsel and Secretary of Orbital Sciences Corporation
(filed herewith).
23.1
Consent of Leo Millstein, Senior Vice President, General
Counsel and Secretary of Orbital Sciences Corporation
(contained in Exhibit 5.1).
23.2
Consent of PricewaterhouseCoopers LLP (filed herewith).
24.1
Power of Attorney (contained on the signature pages).
8