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The Planetary Society BlogBy Emily LakdawallaHubble update: Not returning to normal today after allOct. 17, 2008 | 15:24 PDT | 22:24 UTC
I missed today's press briefing on Hubble, but there's enough detail in the report posted to the NASA website for a status update: Hubble resumed the science timeline at Noon ET on Thursday, October 16. The first activities out of that on-board science timeline were the commanding of the science instruments from their safe to operate modes. This occurred nominally for Wide Field Planetary Camera 2 and the Near Infrared Camera and Multi Object Spectrometer. However, an anomaly occurred during the last steps of the commanding to the Advanced Camera for Surveys. At 1:40 pm, when the low voltage power supply to the ACS Solar Blind Channel was commanded on, software running in a microprocessor in ACS detected an incorrect voltage level in the Solar Blind Channel and suspended ACS. Then at 5:14 pm, the Hubble spacecraft computer sensed the loss of a "keep alive" signal from the NASA Standard Spacecraft Computer in the Science Instrument Command and Data Handling system and correctly responded by safing the NSSC-I and the science instruments. It is not yet known if these two events were related.
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