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<P align="center"><FONT size="2">As filed with the Securities and Exchange Commission on May&nbsp;16, 2003
</FONT>

<P align="right"><FONT size="2">Registration No.&nbsp;333-____
</FONT>

<P align="center"><FONT size="2"><hr size="1" noshade></font>

<P align="center"><FONT size="2"><B>SECURITIES AND EXCHANGE
COMMISSION</B><BR>
Washington, D.C. 20549
</FONT>

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<P align="center"><FONT size="5"><B>FORM S-8</B>
</FONT>

<P align="center"><FONT size="2">REGISTRATION STATEMENT<BR>
UNDER<BR>
THE SECURITIES ACT OF 1933
</FONT>

<center>
<P align="center"><FONT size="5"><B>Orbital Sciences
Corporation</B></font>
<HR width="50%" align="center" size="1" noshade>
<font size="2">(Exact name of registrant as specified in its charter)
</FONT>


<TABLE cellspacing="0" border="0" cellpadding="0" width="90%">
<TR valign="bottom">
    <TD width="51%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="44%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><FONT size="2"><B>Delaware</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="center" valign="top"><FONT size="2">
<B>05-1209561</B></FONT></TD>
</TR>
<TR>
    <TD align="center" valign="top"><HR size="1" noshade></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="center" valign="top"><FONT size="2">
<HR size="1" noshade></FONT></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><FONT size="2">(State or other jurisdiction</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="center" valign="top"><FONT size="2">
(I.R.S. Employer Identification No.)</FONT></TD>
</TR>

<TR valign="bottom">
    <TD align="center" valign="top"><FONT size="2">of incorporation or organization)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="center" valign="top"><FONT size="2">&nbsp;</FONT></TD>
</TR>
</TABLE>

<P align="center"><FONT size="2"><B>21839 Atlantic Boulevard<BR>
Dulles, Virginia 20166</B>
<HR width="50%" align="center" size="1" noshade>
(Address of principal executive offices)
</FONT>

<P align="center"><FONT size="2"><B>Orbital Sciences Corporation<BR>
1999 Employee Stock Purchase Plan</B><BR>
(Full title of the plan)
</FONT>

<P align="center"><FONT size="2"><B>Susan Herlick, Esq.<bR>
Vice President and Acting General Counsel<BR>
Orbital Sciences Corporation<BR>
21839 Atlantic Boulevard<BR>
Dulles, Virginia 20166<BR>
(703)&nbsp;406-5000</B>
<HR width="50%" align="center" size="1" noshade>
(Name, address and telephone number, including area code, of agent for service)
</FONT>

<P align="center"><FONT size="2">Copy 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>
</FONT>
</center>

<P align="center"><FONT size="2">CALCULATION OF REGISTRATION FEE
</FONT>

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<TABLE cellspacing="0" border="0" cellpadding="0" width="90%">
<TR valign="bottom">
    <TD width="33%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="7%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="8%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="8%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="17"><FONT size="1"><hr size="4" noshade></FONT></TD>
</TR>
<TR valign="bottom">
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>Proposed</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>Proposed</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="center"><FONT size="1"><B>Title of securities</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>Amount to be</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>maximum offering</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>maximum aggregate</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>Amount of</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="center"><FONT size="1"><B>to be registered</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>registered</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>price per share (1)</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>offering price (1)</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center" colspan="3"><FONT size="1"><B>registration fee (1)</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="17"><FONT size="1"><hr size="1" noshade></FONT></TD>
</TR>

<TR valign="bottom">
    <TD><DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"><B>Common Stock, par
value $.01</B></FONT></DIV></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">1,500,000</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">5.75</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">8,625,000</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right"><FONT size="2">$</FONT></TD>
    <TD align="right"><FONT size="2">697.77</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="17"><FONT size="1"><hr size="4" noshade></FONT></TD>
</TR>
</TABLE>
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<P align="left"><FONT size="2">(1)&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;9, 2003.
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<P align="center"><FONT size="2"><B>EXPLANATORY NOTE</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This registration statement relates to stock to be granted under the
Orbital Sciences Corporation 1999 Employee Stock Purchase Plan, as amended (the
&#147;Plan&#148;), as described in registration statements on Form&nbsp;S-8, Registration No.
333-69885 and Registration No.&nbsp;333-88258 (collectively, the &#147;Prior Registration
Statement&#148;) and is filed solely to increase the number of shares of Common
Stock registered under the Plan from 3,000,000 shares to 4,500,000 shares. The
contents of the Prior Registration Statement, including all exhibits thereto,
are hereby incorporated by reference.
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<P align="center"><FONT size="2"><B>PART II</B>
</FONT>

<P align="center"><FONT size="2"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
</FONT>

<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
<TR valign="top">
    <TD width="8%" align="left" nowrap><FONT size="2"><B>Item&nbsp;8.</B></FONT></TD>
    <TD width="92%"><FONT size="2"><B>Exhibits.</B></FONT></TD>
</TR>
</TABLE>
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<TABLE cellspacing="0" border="0" cellpadding="0" width="80%">
<TR valign="bottom">
    <TD width="8%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="87%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="left"><FONT size="1"><B>Exhibit</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="left"><FONT size="1"><B>Number</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="left"><FONT size="1"><B>Description</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="left"><HR size="1" noshade width="80"></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="left"><HR size="1" noshade width="80"></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">4</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Orbital Sciences Corporation 1999 Employee Stock<BR>
Purchase Plan, as amended*</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">5</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Opinion of Hogan &#038; Hartson L.L.P.*</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">23.1</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Consent of Hogan &#038; Hartson L.L.P. (contained in Exhibit&nbsp;5)*</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">23.2</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Consent of PricewaterhouseCoopers LLP*</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">23.3</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Consent of Arthur Andersen LLP**</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">24</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Power of Attorney (contained on the Signature Pages)*</FONT></TD>
</TR>
</TABLE>
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<P>
<HR size="1" width="18%" align="left" noshade>

<P align="left"><FONT size="2">*&nbsp;&nbsp;&nbsp;&nbsp; Filed herewith.</FONT>
<P align="left"><FONT size="2">**&nbsp;&nbsp;&nbsp;The consent of Arthur Andersen LLP, the former independent public accountants
for the registrant&#146;s former unconsolidated subsidiary, ORBCOMM Global, L.P. as
of December&nbsp;31, 2000 and for the year then ended, could not be obtained after
reasonable efforts and, accordingly, is being omitted pursuant to Rule&nbsp;437a
promulgated under the Securities Act of 1933, as amended. The absence of a
consent from Arthur Andersen LLP may limit recovery by investors on certain
claims. In particular, and without limitation, investors will not be able to
assert claims against Arthur Andersen LLP under Section&nbsp;11 of the Securities
Act. In addition, the ability of Arthur Andersen LLP to satisfy any claims
(including claims arising from Arthur Andersen LLP&#146;s provision of auditing and
other services to us) may be limited as a practical matter due to the recent
events surrounding that firm.</FONT>

<P align="center"><FONT size="2">2</FONT>
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<P align="center"><FONT size="2"><B>SIGNATURES</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form&nbsp;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 16th
day of May, 2003.
</FONT>
<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
<TR valign="top">
    <TD width="50%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="50%"><FONT size="2">ORBITAL SCIENCES CORPORATION</FONT></TD>
</TR>
</TABLE>
<P>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
<TR valign="top">
    <TD width="50%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="50%"><FONT size="2">BY: <U>/s/ David W.
Thompson&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U><BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;David W. Thompson, Chairman of the Board<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;and Chief Executive Officer</FONT></TD>
</TR>
</TABLE>
<P align="center"><FONT size="2"><B>POWER OF ATTORNEY</B>
</FONT>

<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each person whose signature appears below constitutes and appoints David
W. Thompson and Susan Herlick, 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 Securities and Exchange Commission, granting
unto said attorneys-in-fact and 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.
</FONT>
<P align="left"><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on May&nbsp;16, 2003.
</FONT>
<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="80%">
<TR valign="bottom">
    <TD width="40%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="55%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="center"><FONT size="1"><B>Signature:</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center"><FONT size="1"><B>Title:</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="center"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center"><HR size="1" noshade></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ David W. Thompson<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>David W. Thompson</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Chairman of the Board, Chief Executive Officer and<BR>
Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ James R. Thompson<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>James R. Thompson</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Vice Chairman, President, Chief Operating Officer<BR>
and Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Garrett E. Pierce<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Garrett E. Pierce</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Vice Chairman, Chief Financial Officer and Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ N. Paul Brost<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>N. Paul Brost</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Senior Vice President, Finance</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Hollis M. Thompson<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Hollis M. Thompson</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Vice President and Controller</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">3</FONT>
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<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="80%">
<TR valign="bottom">
    <TD width="40%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="55%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="center"><FONT size="1"><B>Signature:</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center"><FONT size="1"><B>Title:</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="center"><HR size="1" noshade></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center"><HR size="1" noshade></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Edward F. Crawley<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Edward F. Crawley</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Daniel J. Fink<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Daniel J. Fink</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Lennard A. Fisk<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Lennard A. Fisk</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Robert M. Hanisee<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Robert M. Hanisee</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Robert J. Hermann<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Robert J. Hermann</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Janice I. Obuchowski<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Janice I. Obuchowski</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Frank L. Salizzoni<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Frank L. Salizzoni</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Harrison H. Schmitt<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Harrison H. Schmitt</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Director</FONT></TD>
</TR>
<TR><TD><FONT size="2">&nbsp;</FONT></TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">/s/ Scott L. Webster<BR>
</FONT><HR size="1" noshade><FONT size="2">
<B>Scott L. Webster</B></FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Director</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P align="center"><FONT size="2">4</FONT>
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<P align="center"><FONT size="2"><B>EXHIBIT INDEX</B>
</FONT>

<CENTER>
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%">
<TR valign="bottom">
    <TD width="8%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="57%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="left"><FONT size="1"><B>Exhibit</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="left"><FONT size="1"><B>Number</B></FONT></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center"><FONT size="1"><B>Description</B></FONT></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="left"><HR size="1" noshade width="50"></TD>
    <TD><FONT size="1">&nbsp;</FONT></TD>
    <TD nowrap align="center"><HR size="1" noshade width="60"></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">4</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Orbital Sciences Corporation 1999 Employee Stock Purchase Plan, as amended*</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">5</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Opinion of Hogan &#038; Hartson L.L.P.*</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">23.1</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Consent of Hogan &#038; Hartson L.L.P. (contained in Exhibit&nbsp;5)*</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">23.2</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Consent of PricewaterhouseCoopers LLP*</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">23.3</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Consent of Arthur Andersen LLP**</FONT></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><FONT size="2">24</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="left" valign="top"><FONT size="2">
Power of Attorney (contained on the Signature Pages)*</FONT></TD>
</TR>
</TABLE>
</CENTER>
<P>
<HR size="1" width="18%" align="left" noshade>

<P align="left"><FONT size="2">&#149;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Filed herewith.
</FONT>
<P align="left"><FONT size="2">**The consent of Arthur Andersen LLP, the former independent public accountants
for the registrant&#146;s former unconsolidated subsidiary, ORBCOMM Global, L.P. as
of December&nbsp;31, 2000 and for the year then ended, could not be obtained after
reasonable efforts and, accordingly, is being omitted pursuant to Rule&nbsp;437a
promulgated under the Securities Act of 1933, as amended. The absence of a
consent from Arthur Andersen LLP may limit recovery by investors on certain
claims. In particular, and without limitation, investors will not be able to
assert claims against Arthur Andersen LLP under Section&nbsp;11 of the Securities
Act. In addition, the ability of Arthur Andersen LLP to satisfy any claims
(including claims arising from Arthur Andersen LLP&#146;s provision of auditing and
other services to us) may be limited as a practical matter due to the recent
events surrounding that firm.
</FONT>
<P align="center"><FONT size="2">5</FONT>
</BODY>
</HTML>
[{"type": "S-8", "sequence": "1", "filename": "w86805sv8.htm", "description": "FORM S-8", "secsgml_size_bytes": 24712}]
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sv8
As filed with the Securities and Exchange Commission on May 16, 2003
Registration No. 333-____
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
05-1209561
(State or other jurisdiction
(I.R.S. Employer Identification No.)
of incorporation or organization)
21839 Atlantic Boulevard
Dulles, Virginia 20166
(Address of principal executive offices)
Orbital Sciences Corporation
1999 Employee Stock Purchase Plan
(Full title of the plan)
Susan Herlick, Esq.
Vice President and Acting General Counsel
Orbital Sciences Corporation
21839 Atlantic Boulevard
Dulles, Virginia 20166
(703) 406-5000
(Name, address and telephone number, including area code, of agent for service)
Copy 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 securities
Amount to be
maximum offering
maximum aggregate
Amount of
to be registered
registered
price per share (1)
offering price (1)
registration fee (1)
Common Stock, par
value $.01
1,500,000
$
5.75
$
8,625,000
$
697.77
(1)  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 9, 2003.
EXPLANATORY NOTE
This registration statement relates to stock to be granted under the
Orbital Sciences Corporation 1999 Employee Stock Purchase Plan, as amended (the
"Plan"), as described in registration statements on Form S-8, Registration No.
333-69885 and Registration No. 333-88258 (collectively, the "Prior Registration
Statement") and is filed solely to increase the number of shares of Common
Stock registered under the Plan from 3,000,000 shares to 4,500,000 shares. The
contents of the Prior Registration Statement, including all exhibits thereto,
are hereby incorporated by reference.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 8.
Exhibits.
Exhibit
Number
Description
4
Orbital Sciences Corporation 1999 Employee Stock
Purchase Plan, as amended*
5
Opinion of Hogan & Hartson L.L.P.*
23.1
Consent of Hogan & Hartson L.L.P. (contained in Exhibit 5)*
23.2
Consent of PricewaterhouseCoopers LLP*
23.3
Consent of Arthur Andersen LLP**
24
Power of Attorney (contained on the Signature Pages)*
*     Filed herewith.
**   The consent of Arthur Andersen LLP, the former independent public accountants
for the registrant's former unconsolidated subsidiary, ORBCOMM Global, L.P. as
of December 31, 2000 and for the year then ended, could not be obtained after
reasonable efforts and, accordingly, is being omitted pursuant to Rule 437a
promulgated under the Securities Act of 1933, as amended. The absence of a
consent from Arthur Andersen LLP may limit recovery by investors on certain
claims. In particular, and without limitation, investors will not be able to
assert claims against Arthur Andersen LLP under Section 11 of the Securities
Act. In addition, the ability of Arthur Andersen LLP to satisfy any claims
(including claims arising from Arthur Andersen LLP's provision of auditing and
other services to us) may be limited as a practical matter due to the recent
events surrounding that firm.
2
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, 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 16th
day of May, 2003.
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 Susan Herlick, 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 Securities and Exchange Commission, granting
unto said attorneys-in-fact and 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 of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on May 16, 2003.
Signature:
Title:
/s/ David W. Thompson
David W. Thompson
Chairman of the Board, Chief Executive Officer and
Director
/s/ James R. Thompson
James R. Thompson
Vice Chairman, President, Chief Operating Officer
and Director
/s/ Garrett E. Pierce
Garrett E. Pierce
Vice Chairman, Chief Financial Officer and Director
/s/ N. Paul Brost
N. Paul Brost
Senior Vice President, Finance
/s/ Hollis M. Thompson
Hollis M. Thompson
Vice President and Controller
3
Signature:
Title:
/s/ Edward F. Crawley
Edward F. Crawley
Director
/s/ Daniel J. Fink
Daniel J. Fink
Director
/s/ Lennard A. Fisk
Lennard A. Fisk
Director
/s/ Robert M. Hanisee
Robert M. Hanisee
Director
/s/ Robert J. Hermann
Robert J. Hermann
Director
/s/ Janice I. Obuchowski
Janice I. Obuchowski
Director
/s/ Frank L. Salizzoni
Frank L. Salizzoni
Director
/s/ Harrison H. Schmitt
Harrison H. Schmitt
Director
/s/ Scott L. Webster
Scott L. Webster
Director
4
EXHIBIT INDEX
Exhibit
Number
Description
4
Orbital Sciences Corporation 1999 Employee Stock Purchase Plan, as amended*
5
Opinion of Hogan & Hartson L.L.P.*
23.1
Consent of Hogan & Hartson L.L.P. (contained in Exhibit 5)*
23.2
Consent of PricewaterhouseCoopers LLP*
23.3
Consent of Arthur Andersen LLP**
24
Power of Attorney (contained on the Signature Pages)*
•     Filed herewith.
**The consent of Arthur Andersen LLP, the former independent public accountants
for the registrant's former unconsolidated subsidiary, ORBCOMM Global, L.P. as
of December 31, 2000 and for the year then ended, could not be obtained after
reasonable efforts and, accordingly, is being omitted pursuant to Rule 437a
promulgated under the Securities Act of 1933, as amended. The absence of a
consent from Arthur Andersen LLP may limit recovery by investors on certain
claims. In particular, and without limitation, investors will not be able to
assert claims against Arthur Andersen LLP under Section 11 of the Securities
Act. In addition, the ability of Arthur Andersen LLP to satisfy any claims
(including claims arising from Arthur Andersen LLP's provision of auditing and
other services to us) may be limited as a practical matter due to the recent
events surrounding that firm.
5