DULLES, Va., Oct 24, 2002 /PRNewswire-FirstCall 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 2002 financial results prior to the opening of the market on Friday, October 25, 2002, 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. (EDT). The conference call will be hosted by Orbital's senior executives, including:

    * Mr. David W. Thompson, Chairman and Chief Executive Officer
    * Mr. James R. Thompson, Vice Chairman and Chief Operating Officer
    * Mr. Garrett E. Pierce, Vice Chairman and Chief Financial Officer
To listen to the conference call, dial 888-541-8767, and use the conference ID number 6243481. A replay of the conference call will be available approximately two hours after the end of the call and will remain active for one week, until Friday, November 1. For access to the conference call replay, dial 800-642-1687 (international callers should dial 706-645- 9291) and use the same conference ID number.

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

Orbital is one of the world's leading developers and manufacturers of affordable space systems for commercial, civil government and military customers. The company's primary products include low-orbit, geostationary and planetary spacecraft for communications, scientific and remote sensing missions; ground- and air-launched rockets that deliver satellites into orbit; and missile defense boosters that are used as target and interceptor vehicles. Orbital also offers space-related technical services to government agencies and develops and builds satellite-based transportation management systems for public transit agencies and private vehicle fleet operators.

    More information about Orbital can be found at http://www.orbital.com

    For More Information Contact:
    Barron Beneski
    (703) 406-5528
    Public and Investor Relations

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SOURCE Orbital Sciences Corporation

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

URL:              http://www.orbital.com
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