DULLES, Va., May 11 /PRNewswire/ -- Orbital Sciences Corporation (NYSE: ORB) today announced that it will release its first quarter 2001 financial results prior to the opening of the market on Tuesday, May 15, 2001. The company will conduct a conference call the same morning at 8:30 a.m. (EDT), which will be hosted by Orbital's senior 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 until 5:00 p.m. on May 21. For access to the conference call replay, dial 800-756-0570 (international callers should dial 712-998-0776) 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.streetfusion.com . 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 manufacturers of low-cost space systems, including satellites, launch vehicles, space sensors and satellite ground 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: Media: Barron Beneski, 703-406-5528, or
beneski.barron@orbital.com; or Investors: Tim Perrott, 703-406-5997, or
perrott.timothy@orbital.com; both of Orbital Sciences Corporation.
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SOURCE Orbital Sciences Corporation

CONTACT: Media: Barron Beneski, 703-406-5528, or beneski.barron@orbital.com; or Investors: Tim Perrott, 703-406-5997, or perrott.timothy@orbital.com; both of Orbital Sciences Corporation/