NASA's Gravity Recovery And Interior Laboratory (GRAIL)-A spacecraft successfully completed its planned main engine burn at 2 p.m. PST (5 p.m. EST) today. • Fall 2012: The timeline for the extended mission is shown in Figure Ultra-high-resolution gravity models will allow for substantial improvements in our understanding of how impact cratering has affected the lunar crust. The system-level CDR was held November 9–13, 2009 at MIT in Cambridge, MA. Together, the pair weighed 1,600 lbs.
Each spacecraft features a Ka-band LGRS of GRACE heritage to measure the intersatellite range rate. NY 10036. The GRAIL mission is the only mission in history, prior to 2012, to implement a low-energy transfer to a low-altitude orbit about the Moon as part of its primary mission. The function of the TTA is to provide a two-way time-transfer link between the spacecraft to both synchronize and measure the clock offset between the two LGRS clocks. Please refresh the page and try again.Space is part of Future US Inc, an international media group and leading digital publisher. The venerable Delta II rocket, steeped in history, flew what is almost certainly its final mission from Cape Canaveral. • Extended science phase: The science phase of GRAIL's extended mission runs from August 30 to Dec. 14, 2012. The single 22 N main engine is aligned in the -X direction, providing thrust in the +X direction. Spacecraft mass (each spacecraft) Data from past missions have been successfully used to obtain lunar gravity maps. • The OPR (Orbital Period Reduction) phase started on January 2, 2012. Warm gas RCS, 3-axis stabilization Orbit Period Reduction (OPR) Phase • Understand the moon's asymmetric thermal evolution - The extended mission goal is to take an even closer look at the moon's gravity field. • Nov. 2013: Maps of crustal thickness derived from NASA’s GRAIL (Gravity Recovery and Interior Laboratory) mission revealed more large impact basins on the nearside hemisphere of the moon than on its farside. Execution of these maneuvers, as well as the payload checkout and calibration activities, has gone smoothly due to extensive pre-launch operations planning and testing. The Moon offers a unique opportunity for understanding the evolution of all terrestrial bodies as it is easy to get to and has been studied extensively.
The GPA combines all the inputs received from the MWA and TTA to produce the radiometric data that is downlinked to the ground. “Everything went exactly as expected for both lunar orbit insertions,” said Deputy Project Manager Tom Hoff- man. To achieve this, GRAIL mission planners will halve their current operating altitude to the lowest altitude that can be safely maintained (23 km altitude during the extended mission). Note: 1 gal is the measure of acceleration (used in particular in gravity measurements) and is defined in SI units as.
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grail mission orbit