Launch of NASA'S New Solar Mission Rescheduled to June 27

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June 25, 2013

George Diller
Kennedy Space Center, Fla.

Steve Cole
Headquarters, Washington

RELEASE: M13-102


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. 

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:

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

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

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


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