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GRAIL twin lunar probes launch less than one month away

Date:
August 12, 2011
Source:
NASA/Jet Propulsion Laboratory
Summary:
NASA's twin lunar probes -- GRAIL-A and GRAIL-B -- completed their final inspections and were weighed one final time at the Astrotech Space Operations facility in Titusville, Fla., on Tuesday. The two Gravity Recovery and Interior Laboratory (GRAIL) spacecraft will orbit the moon in formation to determine the structure of the lunar interior from crust to core and to advance understanding of the thermal evolution of the moon. GRAIL's launch period opens Sept. 8, 2011, and extends through Oct. 19. For a Sept. 8 liftoff, the launch window opens at 5:37 a.m. PDT (8:37 a.m. EDT) and remains open through 6:16 a.m. PDT (9:16 a.m. EDT).

At Astrotech Space Operation's payload processing facility in Titusville, Fla., NASA's Gravity Recovery and Interior Laboratory-A (GRAIL-A) lunar probe is lifted from its workstand and across the clean room toward the spacecraft adapter ring, at left, where GRAIL-B is already secured.
Credit: NASA/KSC

NASA's twin lunar probes -- GRAIL-A and GRAIL-B -- completed their final inspections and were weighed one final time at the Astrotech Space Operations facility in Titusville, Fla., on Tuesday. The two Gravity Recovery and Interior Laboratory (GRAIL) spacecraft will orbit the moon in formation to determine the structure of the lunar interior from crust to core and to advance understanding of the thermal evolution of the moon. GRAIL's launch period opens Sept. 8, 2011, and extends through Oct. 19. For a Sept. 8 liftoff, the launch window opens at 5:37 a.m. PDT (8:37 a.m. EDT) and remains open through 6:16 a.m. PDT (9:16 a.m. EDT).

Later this week, the two spacecraft will be loaded side-by-side on a special adapter and packaged inside a payload fairing that will protect them during their launch into space. Next week, GRAIL is expected to make the trip from Astrotech to Launch Complex 17 at the Cape Canaveral Air Force Station where it will be mated with its United Launch Alliance Delta II Heavy rocket.

GRAIL-A and GRAIL-B will fly in tandem orbits around the moon for several months to measure its gravity field in unprecedented detail. The mission will answer longstanding questions about Earth's moon, and provide scientists a better understanding of how Earth and other rocky planets in the solar system formed.

NASA's Jet Propulsion Laboratory, Pasadena, Calif., manages the GRAIL mission. The Massachusetts Institute of Technology, Cambridge, is home to the mission's principal investigator, Maria Zuber. The GRAIL mission is part of the Discovery Program managed at NASA's Marshall Space Flight Center in Huntsville, Ala. Lockheed Martin Space Systems, Denver, built the spacecraft. Launch management for the mission is the responsibility of NASA's Launch Services Program at the Kennedy Space Center in Florida. JPL is a division of the California Institute of Technology in Pasadena.

More information about GRAIL is online at: http://grail.nasa.gov .


Story Source:

The above story is based on materials provided by NASA/Jet Propulsion Laboratory. Note: Materials may be edited for content and length.


Cite This Page:

NASA/Jet Propulsion Laboratory. "GRAIL twin lunar probes launch less than one month away." ScienceDaily. ScienceDaily, 12 August 2011. <www.sciencedaily.com/releases/2011/08/110812094339.htm>.
NASA/Jet Propulsion Laboratory. (2011, August 12). GRAIL twin lunar probes launch less than one month away. ScienceDaily. Retrieved August 21, 2014 from www.sciencedaily.com/releases/2011/08/110812094339.htm
NASA/Jet Propulsion Laboratory. "GRAIL twin lunar probes launch less than one month away." ScienceDaily. www.sciencedaily.com/releases/2011/08/110812094339.htm (accessed August 21, 2014).

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