Orbital Sciences Corporation (NYSE:ORB):


Tuesday, January 31, 2006
10:00 a.m. to 12:00 p.m.


Orbital Sciences Corporation
21839 Atlantic Boulevard
Dulles, Virginia 20166
(Media should gather in lobby of Building #1)


--  Orbital executives will give an overview briefing on the company's
    civil government and commercial satellite business -- Media will
    be offered tours of new Mission Control Complex and Satellite
    Manufacturing Facility

Photo Opportunities:

--  Satellite mission control center

--  Satellite manufacturing clean rooms

--  Satellite environmental test bay

--  Satellites in production


Introduction and Satellite Business Overview
Jack Danko, Executive Vice President and General Manager, Space
Systems Group

Science and Technology Satellites
Mike Miller, Vice President, Science and Technology Satellite Programs

Commercial Communications Satellites
Dr. Ali Atia - President of Orbital Communications International

Mission Control Complex Facility Tour
Ray Crough - Senior Director of Satellite Systems Engineering

Satellite Manufacturing Facility Tour
Dave Hastman - Vice President of Manufacturing Operations

Media Credentials:

If you plan to attend, you must submit your name and publication to:

    CONTACT: Orbital Sciences Corporation
             Barron Beneski, 703-406-5528

    SOURCE: Orbital Sciences Corporation