WASHINGTON, June, 28, 2013 /PRNewswire-USNewswire/ -- NASA's Interface
Region Imaging Spectrograph (IRIS) spacecraft launched Thursday
at 7:27 p.m. PDT (10:27 p.m. EDT) from Vandenberg Air Force Base, Calif.
The mission to study the solar atmosphere was placed in orbit by an Orbital
Sciences Corporation Pegasus XL rocket.
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"We are thrilled to add IRIS to the suite of NASA missions studying the sun," said John
Grunsfeld, NASA's associate administrator for science in Washington. "IRIS will help
scientists understand the mysterious and energetic interface between the surface and
corona of the sun."
IRIS is a NASA 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 interface region also is where most
of the sun's ultraviolet emission is generated. These emissions impact the near-Earth space
environment and Earth's climate.
The Pegasus XL carrying IRIS was deployed from an Orbital L-1011 carrier aircraft over the
Pacific Ocean at an altitude of 39,000 feet, off the central coast of California about 100 miles
northwest of Vandenberg. The rocket placed IRIS into a sun-synchronous polar orbit that
will allow it to make almost continuous solar observations during its two-year mission.
The L-1011 took off from Vandenberg at 6:30 p.m. PDT and flew to the drop point over the
Pacific Ocean, where the aircraft released the Pegasus XL from beneath its belly. The first
stage ignited five seconds later to carry IRIS into space. IRIS successfully separated from
the third stage of the Pegasus rocket at 7:40 p.m. At 8:05 p.m., the IRIS team confirmed
the spacecraft had successfully deployed its solar arrays, has power and has acquired the
sun, indications that all systems are operating as expected.
"Congratulations to the entire team on the successful development and deployment of the
IRIS mission," said IRIS project manager Gary Kushner of the Lockheed Martin Solar and
Atmospheric Laboratory in Palo Alto, Calif. "Now that IRIS is in orbit, we can begin our
30-day engineering checkout followed by a 30-day science checkout and calibration period."
IRIS is expected to start science observations upon completion of its 60-day commissioning
phase. During this phase the team will check image quality and perform calibrations and
other tests to ensure a successful mission.
NASA's Explorer Program at Goddard Space Flight Center in Greenbelt, Md., provides
overall management of the IRIS mission. The principal investigator institution is Lockheed
Martin Space Systems Advanced Technology Center. NASA's Ames Research Center will
perform ground commanding and flight operations and receive science data and spacecraft
telemetry.
The Smithsonian Astrophysical Observatory designed the IRIS telescope. The Norwegian
Space Centre and NASA's Near Earth Network provide the ground stations using antennas
at Svalbard, Norway; Fairbanks, Alaska; McMurdo, Antarctica; and Wallops Island,
Va. NASA's Launch Services Program at the agency's Kennedy Space Center in Florida is
responsible for the launch service procurement, including managing the launch and
countdown. Orbital Sciences Corporation provided the L-1011 aircraft and Pegasus XL
launch system.
For more information about the IRIS mission, visit:
http://www.nasa.gov/iris
SOURCE NASA
/Web site: http://www.nasa.gov
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