DULLES, Va.Feb. 1, 2007--Orbital Sciences Corporation (NYSE:ORB) announced today that its Chairman and CEO, David W. Thompson, and Vice Chairman and CFO Garrett E. Pierce, will make a presentation to investors and analysts during Cowen and Company's 28th Annual Aerospace/Defense Conference to be held in New York City on February 6. Orbital's presentation is scheduled to take place at 2:30 p.m. (EST).

On the day of the conference, Orbital will provide a link to the live audio webcast of the presentation and will post the informational 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.


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

    SOURCE: Orbital Sciences Corporation