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Orbital Reschedules New Antares Rocket Launch Window after Winds Prevent Saturday Launch

Status Report From: Orbital ATK
Posted: Saturday, April 20, 2013



A-ONE Mission Team Working Toward an Attempt on Sunday, April 21

(Dulles, VA 20 April 2013) - Orbital Sciences Corporation (NYSE: ORB), one of the world's leading space technology companies, today announced that excessive, high-altitude wind speeds prevented the planned April 20 launch attempt of the Antares rocket from the Mid-Atlantic Regional Spaceport (MARS) launch pad at NASA's Wallops Flight Facility on Wallops Island, Va.

"Given the winds and wind direction, the debris requirement for the Range and Federal Aviation Administration could not be achieved today," said Mr. Frank Culbertson, Orbital's Executive Vice President and Mission Director for the Antares Test Flight. "This requirement keeps any potential debris from falling outside of a predefined area in the event of an anomaly. Flight requirements dictate that we stop the countdown and pick it up when the conditions improve."

The next launch attempt is scheduled to take place no earlier than Sunday, April 21, with a window extending from 5 - 8 p.m. EDT. NASA TV and webcast launch coverage will begin at 4:30 p.m. EDT on www.NASA.gov.

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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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