Orbital to Proceed With Antares Launch Tomorrow


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(Wallops Island, VA 08 January 2014) - Following a comprehensive review of data related to the radiation environment in space, further reviews and modeling of the rocket's avionics systems, and the forecast for favorable terrestrial weather conditions at the Wallops Island launch facility, the Antares launch team has decided to proceed forward with a launch attempt of the Orbital-1 CRS mission to the International Space Station tomorrow, January 9, pending the close out of all remaining overnight reviews and tests. Upon a deeper examination of the current space weather environment, Orbital's engineering team, in consultation with NASA, has determined that the risk to launch success is within acceptable limits established at the outset of the Antares program.

Tomorrow's target launch time is 1:07 p.m. (EST), which would allow the Cygnus spacecraft to rendezvous and berth with the International Space Station early Sunday morning, January 12.

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.

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Contact:         

Barron Beneski (703) 406-5528

Public and Investor Relations

Orbital Sciences Corporation

beneski.barron@orbital.com

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