Orbital Sciences
Corporation 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 the Lehman Brothers 2004
Small Cap Conference to be held on Thursday, November 18 in
Scottsdale, Arizona. The company’s presentation is scheduled to begin
at 8:40 a.m. MST (10:40 a.m. EST).

Orbital will provide a link to the webcast of the audio portion of
the company’s presentation, as well as post the presentation slides on
the company’s web site at http://www.orbital.com/Investor/. Orbital
will maintain the link to the conference replay and keep the
presentation slides available for five business days following its
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.