The GRAIL expedition to explore and map the Moon’s gravity field is scheduled to end today with the intentional impact of twin spacecraft, Ebb and Flolw, into the lunar surface.
NASA TV plans to begin live coverage of the mission’s end at 5:00 p.m. ET
The spacecraft are scheduled to impact the surface at 5:28 p.m. ET
See this earlier article for details.
See AmericaSpace’s Twitter feed.
UPDATE 2:01 p.m.
NASA TV’s live coverage of the end of the GRAIL mission has begun.
The spacecraft’s remained fuel was depleted in a final burn about 20 minutes ago. Ebb had about 20 m/s Δ-v and Flow had about 25 m/s Δ-v.
Dr. Mari Zuber, PI the mission, reports that neither spacecraft had an upset that put it into safe-mode. She adds that GRAIL succeeded beyond all expectations.