Wins $60 Million in New Small Launch Vehicle Orders

Orbital Sciences Corporation has received firm orders for four small space launch vehicles from the U.S. Government. At the end of 2002, the National Aeronautics and Space Administration (NASA) contracted with the company to launch its Spectroscopy and Photometry of the Intergalactic Medium's Diffuse Radiation (SPIDR) satellite aboard the company's Pegasus rocket in a mission that will take place in 2005.

Separately, the U.S. Department of Defense (DoD) contracted with the company for three Minotaur space launch vehicles under the U.S. Air Force's Orbital/Suborbital (OSP)-1 program. One of the Minotaur vehicles will be used for the Department of Defense's Near-Field Infrared Experiment (NFIRE) mission and the other two vehicles will be used for missions to be announced by the DoD at a later date. Together, the four firm orders total approximately $60 million in value.

The missions will be executed by Orbital beginning in 2003 and will be completed over the next several years. The company did not disclose the financial terms of the individual missions.

Mr. David W. Thompson, Orbital's Chairman and Chief Executive Officer, said, "As the world's preeminent supplier of small launch vehicles, we are very pleased with the continued strong demand for our family of small launchers and booster rockets. We are very grateful for the confidence our customers have in our launch vehicle products and believe it is well placed. Our company is totally committed to continuing our outstanding reliability record in support of our customers' important missions."

About Pegasus

Orbital's Pegasus rocket is the world's only small space launch vehicle that has been certified with NASA's Payload Risk Category 3, which the space agency reserves for its highest value space missions.

With the SPIDR contract, NASA has now awarded Orbital 6 of up to 16 potential missions under Kennedy Space Center's Small Expendable Launch Vehicle Services agreement.

About Minotaur

Orbital developed the ground-launched four-stage Minotaur rocket for the U.S. Air Force's Orbital/Suborbital Program. The vehicle uses U.S. Government-supplied Minuteman II motors that have been decommissioned as a result of arms reduction treaties, with the deactivated rocket motors serving as the vehicle's first and second stages. Its third and fourth stages, as well as its guidance and control system, use technology from the company's Pegasus rocket.

The NFIRE mission to be flown on a Minotaur rocket in 2004 is sponsored by the U.S. Missile Defense Agency through the Air Force Space and Missile Systems Center's Rocket Systems Launch Program. The satellite is designed to evaluate technologies for boost-phase missile defense.

FMI: www.orbital.com