DULLES, Va., Aug 08, 2002 /PRNewsire-FirstCall via Comtex/ --

Contract Modification From Lockheed Martin Continues Company's Decade-Long Role in Supporting In-Orbit Servicing Of Groundbreaking Space-Based Observatory

Orbital Sciences Corporation (NYSE: ORB) announced today that its Technical Services Division, based in Greenbelt, MD, has been awarded a two-year $22 million cost reimbursable contract from Lockheed Martin Corporation for engineering support services for NASA's upcoming Hubble Space Telescope (HST) servicing mission. This recent award continues the company's involvement in HST servicing missions over the past 10 years. The fifth servicing mission of the orbiting observatory is currently scheduled to take place in 2004 following earlier missions in 1993, 1997, 1999 and 2002. Orbital has contributed to each of the four previous missions, with responsibility for the design, integration and testing of the Space Support Equipment, which ensures that the HST's new scientific instruments and orbital replacement units are safely transported aboard the Space Shuttle.

Under the contract, which Orbital will carry out at NASA's Goddard Space Flight Center and Kennedy Space Center, the company will develop payload integration hardware for the Space Shuttle and provide engineering support for actual mission operations. For the upcoming HST servicing mission, Orbital is developing a new lightweight composite carrier unit to maximize the payload capacity of the Shuttle, increasing the amount of hardware that can be installed into the space-based telescope.

"Orbital's continued involvement in the Hubble Space Telescope servicing missions is a real source of pride for all Orbital employees," said Mr. Richard Hicks, Orbital's Vice President and head of its Technical Services Division. "To play a role in maintaining one of man's greatest accomplishments in space is a very rewarding experience. We look forward to offering our continued support to Lockheed Martin and NASA in the next servicing mission of this marvelous observatory," Mr. Hicks concluded.

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 and public works agencies, as well as private vehicle fleet operators.

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

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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.prnewswire.com
                  http://www.orbital.com
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