LCROSS Emergency Status Lifted

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NASA MISSION UPDATE
Fri, 04 Sep 2009 01:11:29 PM PDT

At 5 p.m. (PDT) on Sept. 3, the LCROSS Project took the LCROSS spacecraft off of Emergency status. For the past two weeks, under close, continuous monitoring from the LCROSS mission operations team, the spacecraft has not exhibited any repeat of the anomalous behavior which had caused the spacecraft to consume large amounts of fuel while out of view. All spacecraft systems are operating in a nominal state.

“I am very proud and impressed by this LCROSS team,” said Daniel Andrews, LCROSS project manager. “From the moment we discovered the spacecraft needed help, this team has tirelessly worked mitigations to assure we are able to finish the mission”

The LCROSS team closely studied the cause of the intermittent Inertial Reference Unit (IRU) data fault and have put additional controls in place to assure a similar situation does not occur again. The team has also retuned the spacecraft control system to optimize fuel efficiency. Nominal fuel efficiency has been improved by a factor of three, while contingency fuel efficiency has been improved by a factor of 100.

“We have adopted a new miserly approach to the rest of the mission and we anticipate full mission success,” Andrews added,

The spacecraft recently conducted a planned pitch-flip maneuver to maintain good antenna alignment with the Earth, assuring the highest communications rates possible, as the spacecraft entered into it third and final orbit of the Earth before lunar impact.