-- Medium-Class Satellite Enables Company to Address Broader Market Opportunities for FSS, DTH and HTS Applications With Up To 8 Kilowatts of Payload Power --

-- Orbital to Offer New Hybrid Design Combining Traditional and Electric Propulsion for Orbit Raising and Station Keeping --

DULLES, Va.Mar. 10, 2014-- Orbital Sciences Corporation (NYSE: ORB), one of the world s leading space technology companies, today introduced its GEOStar-3TM satellite platform, stating the program is now ready for delivery to commercial satellite operators on production schedules of 24 to 27 months. The medium-class GEOStar-3 platform is an extension of Orbital s highly successful small-class GEOStar-2 bus that has led its market niche for the past decade. This evolutionary technology upgrade represents an incremental expansion of the company s flight-proven, low-risk product line, based on a standard platform with configure-to-order payload flexibility to maximize customer value for fixed satellite services (FSS), direct to home (DTH) and high throughput satellite (HTS) applications.

The enhanced capacity, flexibility and scalability of the GEOStar-3 platform enables us to address the requirements of the medium-size satellite market, offering customers more payload power, higher throughput and better overall value, said Mr. Christopher Richmond, Orbital s Senior Vice President of its Communications Satellite business unit. This product expands Orbital s addressable market, while improving our reliability and delivery schedules to customers around the world, including the high-growth, high-throughput satellite segment.

The GEOStar-3 platform incorporates key enhancements that evolved from the GEOStar-2 bus, including an upgraded electrical power system that boosts payload power capability from 5 kilowatts up to 8 kilowatts and a physically larger bus allowing the vehicle to support communications payloads weighing up to 800 kilograms.

The company is currently under contract to deliver the first GEOStar-3 in early 2016 and is in active negotiations with several other customers for additional orders, including for its new hybrid electric propulsion (EP) platform option. The hybrid GEOStar-3 design uses traditional chemical propulsion to reach orbit in a matter of days, not months like a full EP satellite, and then performs station-keeping operations for 15 years or more with EP, resulting in an optimum mass-efficient system.

Orbital also designed the GEOStar-3 platform to enable dual-launch configurations. The ability to stack two GEOStar satellites on a single launch vehicle significantly reduces the overall system cost and provides the widest array of launch options possible, a key benefit of the GEOStar-3 platform to Orbital s customers.

The GEOStar-3 satellite will continue Orbital s tradition of industry-leading short-cycle delivery schedules. The company s small-class GEOStar-2 spacecraft are regularly delivered in 22 to 24 months and the company expects to deliver the medium-class GEOStar-3 spacecraft in 24 to 27 months. Like the GEOStar-2 satellite, the GEOStar-3 platform is designed for a service life of at least 15 years.

About Orbital

Orbital develops and manufactures small- and medium-class rockets and space systems for commercial, military and civil government customers. The company s primary products are satellites and launch vehicles, including low-Earth orbit, geosynchronous-Earth orbit and planetary spacecraft for communications, remote sensing, scientific and defense missions; human-rated space systems for Earth-orbit, lunar and other 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 provides satellite subsystems and space-related technical services to government agencies and laboratories. More information about Orbital can be found at http://www.orbital.com. Follow the company on Twitter @OrbitalSciences.

Source: Orbital Sciences Corporation

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