DULLES, Va., Nov 2, 2001 /PRNewswire via COMTEX/ --

- 9:00 a.m. Conference Call With Financial Analysts and Investors to Be Webcast -

Orbital Sciences Corporation (NYSE: ORB) will release its third quarter 2001 financial results prior to the opening of the market on Wednesday, November 7, 2001, the company announced today. Orbital will also conduct a conference call with financial analysts and investors the same morning, beginning at 9:00 a.m. (Eastern time), which will be hosted by senior company executives, including:

    *  Mr. David W. Thompson, Chairman and Chief Executive Officer

    *  Mr. James R. Thompson, President and Chief Operating Officer

    *  Mr. Garrett E. Pierce, Executive Vice President and Chief Financial
       Officer
To access the conference call, dial 888-709-9516, and use the passcode "Orbital." A replay of the conference call will be available about an hour after the end of the call and will remain active for one week, until 5:00 p.m. on November 14. For access to the conference call replay, dial 800-385-2541 (international callers should dial 402-220-9805) and use the passcode "5956."

For webcast registration and information, please visit Orbital's web site at http://www.orbital.com/Investor or go to http://www.ccbn.com . It is advisable to register at least 20 minutes prior to the call to download and install any necessary audio software.

Orbital develops and manufactures affordable space systems, including satellites, launch vehicles and advanced space systems. Orbital is also involved with satellite-based networks that provide wireless data communications and high-resolution Earth imagery to customers around the world.

    More information about Orbital can be found at http://www.orbital.com .
CONTACT: Barron Beneski of Orbital Sciences Corporation, Public and Investor Relations, +1-703-406-5528, or beneski.barron@orbital.com.

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SOURCE Orbital Sciences Corporation

CONTACT:          Barron Beneski of Orbital Sciences Corporation, Public and
                  Investor Relations, +1-703-406-5528, or beneski.barron@orbital.com

URL:              http://www.orbital.com
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