DULLES, Va., Jun 22, 2004 (BUSINESS WIRE) -- Orbital Sciences Corporation (NYSE:ORB) announced today that its Chairman and Chief Executive Officer David W. Thompson and Vice Chairman and Chief Financial Officer Garrett E. Pierce will make a presentation to investors and analysts during Sidoti & Company's First Annual Emerging Growth Institutional Investor Forum to be held in Boston, Massachusetts at the Ritz-Carlton Boston Common. Orbital's presentation is scheduled to take place at 2:05 p.m. (EDT) on Monday, June 28.

Orbital will make available the presentation slides that Mr. Thompson and 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.

SOURCE: Orbital Sciences Corporation

Orbital Sciences Corporation
Public and Investor Relations:
Barron Beneski, 703-406-5528
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