DULLES, Va., Mar 5, 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 fourth quarter and year-end 2001 financial results prior to the opening of the market on Thursday, March 7, 2002, the company announced today. Orbital will also conduct a conference call with financial analysts and investors Thursday morning, beginning at 9:00 a.m. (EST), 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 listen to the conference call, dial 888-541-8767, and use the password "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 Thursday, March 14. For access to the conference call replay, dial 800-642-1687 (international callers should dial 706-645-9291) and use the conference ID number 3321167.

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 are spacecraft and launch vehicles, including low-orbit, geostationary and planetary spacecraft for communications, remote sensing and scientific missions; ground- and air- launched rockets that deliver satellites into orbit; and missile defense boosters that are used as interceptor and target 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 .
CONTACT: Public and Investor Relations: Barron Beneski of Orbital Sciences Corporation, +1-703-406-5528, beneski.barron@orbital.com.

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SOURCE Orbital Sciences Corporation

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

URL:              http://www.orbital.com
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