HT Space.comGrail-A and Grail-B won't be ready to start their science campaign immediately upon arriving at the moon. Rather, they'll spend another two months circling lower and lower, eventually settling into orbits just 34 miles (55 kilometers) above the lunar surface, researchers said.
The twin probes will begin taking measurements in March. They'll chase each other around the moon for 82 days, staying 75 to 225 miles (121 to 362 km) apart.
Thursday, December 29, 2011
The Grails A & B will arrive and enter Moon's orbit on New Years
The Twin will Grails will arrive to Lunar Orbit this New Years Weekend.