June 25, 2013

George Diller Kennedy Space Center, Fla 321-867-2468 george h diller@nasa gov

Steve Cole Headquarters, Washington 202-358-0918 stephen e cole@nasa gov

RELEASE: M13-102

LAUNCH OF NASA'S NEW SOLAR MISSION RESCHEDULED TO JUNE 27

WASHINGTON -- The launch of NASA's Interface Region Imaging Spectrograph (IRIS) mission is being delayed one day to 7:27 p m PDT (10:27 p m EDT) Thursday, June 27, from Vandenberg Air Force Base in California Live NASA Television launch coverage begins at 6 p m PDT

Because of a significant power outage at Vandenberg earlier this week, certain Western Range facilities will not be ready to support the original June 26 launch date Range officials believe they will be able to restore power to the affected facilities in time to support a launch Thursday evening Managers will assess the situation at the Launch Readiness Review Wednesday

The launch of IRIS on an Orbital Sciences Corporation Pegasus XL rocket is targeted for the middle of a five-minute window

IRIS is a NASA Small Explorer Mission to observe how solar material moves, gathers energy and heats up as it travels through a little-understood region in the sun's lower atmosphere This interface region between the sun's photosphere and corona powers its dynamic million-degree atmosphere and drives the solar wind

The drop of the air-launched Pegasus from Orbital's L-1011 carrier aircraft will occur over the Pacific Ocean at an altitude of 39,000 feet, about 100 miles northwest of Vandenberg off the central coast of California, south of Big Sur

The IRIS News Center at Kennedy's Vandenberg Resident Office may be reached between 8 a m and 4:30 p m at 805-605-3051

For complete details on media registration, media events, and live launch coverage on NASA TV, visit:

http://go nasa gov/13L6djG

For NASA TV streaming video, schedule and downlink information, visit:

http://www nasa gov/ntv

Extensive prelaunch and launch day coverage of the IRIS spacecraft will be available on NASA's home page at:

http://www nasa gov

To view the IRIS webcast and launch blog, and learn more about the mission, visit:

http://www nasa gov/iris

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