DULLES, Va.Aug. 30, 2007--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 the Kaufman Brothers Tenth Annual Investor Conference to be held in New York, NY. Orbital's presentation is scheduled to take place at 1:50 p.m. (EDT) on Thursday, September 6.

Orbital will provide a link to the webcast of the presentation on the company's web site at http://www.orbital.com/Investor/. The webcast will include a broadcast of Mr. Pierce's presentation slides. Orbital will maintain the link to the conference replay for five business days following the 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-orbit 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
             Barron Beneski, 703-406-5528
             Public and Investor Relations
             Beneski.barron@orbital.com

    SOURCE: Orbital Sciences Corporation