Orbital Sciences
Corporation (NYSE: ORB) announced today that its Vice Chairman and
Chief Financial Officer Garrett E. Pierce will make a presentation to
investors and analysts during Sidoti & Company’s Third Annual West
Coast Emerging Growth Institutional Investor Forum to be held in San
Francisco, California at the Ritz-Carlton San Francisco. Orbital’s
presentation is scheduled to take place at 11:35 a.m. (PDT) on
Tuesday, September 14.

Orbital will make available the slides that Mr. Pierce will
present to the live audience on the company’s web site at:
http://www.orbital.com/Investor/. The slides will be posted prior to
the beginning of the live presentation.

About Orbital

Orbital develops and manufactures small space and rocket systems
for commercial, military and civil government customers. The company’s
primary products are satellites and launch vehicles, including
low-orbit, geosynchronous and planetary spacecraft for communications,
remote sensing, scientific and defense missions; ground- and
air-launched rockets that deliver satellites into orbit; and missile
defense systems 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.

Contact:

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