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NASA ready to 'wake up' Cassini probe

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by Staff Writers
Pasadena, Calif. (UPI) Nov 23, 2010
NASA says it is ready to reactivate the Cassini space probe orbiting Saturn after it switched to a "safe mode" on Nov. 2 and stopped sending science data.

Cassini mission controllers plan to reawaken the spacecraft Wednesday out of its protective standby mode, caused by an ill-timed flip of a data bit in Cassini's command and data system computer, SPACE.com reported.

"The bit flip happened in exactly the wrong location; almost anyplace else would have merely resulted in a rejected command, but the spacecraft responded exactly as programmed," Cassini program manager Bob Mitchell, of NASA's Jet Propulsion Laboratory in Pasadena, Calif., said.

"Cassini is in excellent shape, and we are looking forward to the next seven years of this mission," he said.

This was the sixth time since Cassini's launch in 1997 the spacecraft put itself into safe mode.

While in safe mode, the probe beams engineering and spacecraft health data to its mission operations center at JPL, but cannot perform scientific observations.

Cassini engineers commanded the probe to reboot its computer to fix the bit flip problem.

Scientific instruments have also been reactivated and mission managers hope to recover data lost during the switch into safe mode, JPL officials said.

"Playback from the computer's memory is enabling engineers to extract science data collected before the spacecraft entered safe mode," they said.



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SATURN DAILY
Cassini To Resume Nominal Operations
Pasadena CA (JPL) Nov 10, 2010
Engineers at NASA's Jet Propulsion Laboratory, Pasadena, Calif., expect the Cassini spacecraft will resume normal operations on Nov. 24. They have traced the steps taken by an onboard computer before Cassini put itself in precautionary "safe mode" last week. Mission managers determined that the spacecraft went into safe mode because of a flip of a bit in the command and data system c ... read more







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