Orbital to announce third quarter 2001 financial results on Nov. 7

— 9:00 a.m. Conference Call with Financial Analysts and Investors to be
Webcast

–Orbital Sciences Corporation (NYSE: ORB) will
release its third quarter 2001 financial results prior to the opening of the
market on Wednesday, November 7, 2001, the company announced today. Orbital
will also conduct a conference call with financial analysts and investors
the
same morning, beginning at 9:00 a.m. (Eastern time), which will be hosted by
senior company executives, including:

* Mr. David W. Thompson, Chairman and Chief Executive Officer

* Mr. James R. Thompson, President and Chief Operating Officer

* Mr. Garrett E. Pierce, Executive Vice President and Chief Financial
Officer

To access the conference call, dial 888-709-9516, and use the passcode
“Orbital.” A replay of the conference call will be available about an hour
after the end of the call and will remain active for one week, until 5:00
p.m.
on November 14. For access to the conference call replay, dial 800-385-2541
(international callers should dial 402-220-9805) and use the passcode
“5956.”

For webcast registration and information, please visit Orbital’s web site at
http://www.orbital.com/ Investor or go to http://www.ccbn.com. It is
advisable
to register at least 20 minutes prior to the call to download and install
any
necessary audio software.

Orbital develops and manufactures affordable space systems, including
satellites, launch vehicles and advanced space systems. Orbital is also
involved with satellite-based networks that provide wireless data
communications
and high-resolution Earth imagery to customers around the world.