CAPE CANAVERAL, Fla. — NASA’s Gravity Recovery And Interior Laboratory (GRAIL), mission to study the moon is in final launch preparations for a scheduled Sept. 8 launch onboard a Delta II rocket from Cape Canaveral Air Force Station in Florida.

GRAIL’s twin spacecraft are tasked for a nine-month mission to explore Earth’s nearest neighbor in unprecedented detail. They will determine the structure of the lunar interior from crust to core and advance our understanding of the thermal evolution of the moon.

“Yesterday’s final encapsulation of the spacecraft is an important mission milestone,” said David Lehman, GRAIL project manager for NASA’s Jet Propulsion Laboratory in Pasadena, Calif. “Our two spacecraft are now sitting comfortably inside the payload fairing which will protect them during ascent. Next time the GRAIL twins will see the light of day they will be about 95 miles up and accelerating.”

The spacecraft twins, GRAIL A and B, will fly a circuitous route to lunar orbit taking 3.5 months and covering approximately 2.6 million miles (4.2 million kilometers) for GRAIL-A, and 2.7 million miles (4.3 million kilometers) for GRAIL-B.

In lunar orbit, the spacecraft will transmit radio signals precisely defining the distance between them. Regional gravitational differences on the moon are expected to expand and contract that distance. GRAIL scientists will use these accurate measurements to define the moon’s gravity field. The data will allow mission scientists to understand what goes on below the surface of our natural satellite.

“GRAIL will unlock lunar mysteries and help us understand how the moon, Earth and other rocky planets evolved as well,” said Maria Zuber, GRAIL principal investigator from the Massachusetts Institute of Technology in Cambridge.

GRAIL’s launch period opens Sept. 8 and extends through Oct. 19. On each day, there are two separate launch opportunities separated by approximately 39 minutes. On Sept. 8, the first launch opportunity is 8:37 a.m. EDT; the second is 9:16 a.m.

JPL manages the GRAIL mission. It is part of the Discovery Program managed at NASA’s Marshall Space Flight Center in Huntsville, Ala. Lockheed Martin Space Systems in 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.

For extensive pre-launch and launch day coverage of the GRAIL spacecraft, visit: http://www.nasa.gov

A prelaunch webcast for the mission will be streamed at noon on Wednesday, Sept. 7. Live countdown coverage through NASA’s Launch Blog begins at 6:30 a.m. on Sept. 8. Coverage features live updates as countdown milestones occur and streaming video clips highlighting launch preparations and liftoff.

To view the webcast and the blog or to learn more about the GRAIL mission, visit: http://www.nasa.gov/grail and http://grail.nasa.gov

To view live interviews with lunar scientists from noon to 5 p.m. on
Sept. 8 and 9, visit: http://www.livestream.com/grail