Orbital Sciences Corporation (OSC, though commonly referred to as Orbital) is an American company which specializes in the manufacturing and launch of satellites. Its Launch Systems Group is heavily involved with missile defense launch systems. Orbital formerly owned ORBIMAGE (now GeoEye) and the Magellan line of GPS receivers, though they are now divested (the latter to Thales). Orbital's NYSE ticker symbol is ORB. It has its headquarters in the Dulles area of unincorporated Loudoun County, Virginia, United States.
Orbital Sciences since inception has built 569 launch vehicles with 82 more to be delivered by 2015. 174 satellites have been built by the company since 1982 with 24 more to be delivered by 2015. Orbital has a 40% share of the interceptor market, 55% share of the small communications satellite market, and a 60% share of the small launch vehicles market. The company is expanding into the medium size launch vehicles and satellites market with the development of the Antares rocket and the acquisition of the General Dynamics Advanced Information System Satellite division.
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