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Friday 16 January 2009 9.00am EST
| During the last two weeks Chandra completed the observing schedule as
planned.
A real-time procedure was conducted on Jan 15 to patch the ACIS flight software. The new version (44, Standard C, Optional C) includes code changes that address a number of issues such as preventing Back End Processor (BEP) telemetry packet loss under certain timing conditions and preventing a BEP reset on Front End Processor powerdown. The patch was initially loaded on Oct 1 but backed out as a conservative measure following an expected BEP reboot on Oct 5. Further testing failed to reproduce the reset and analysis suggests a single event upset as the cause. All observations following the patch reload have been nominal. The schedule of targets for the next week is shown below and includes an observation of Eta Carinae coordinated with Suzaku. |
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Radiation Belts Jan 18 SNR1987A ACIS-S/HETG 4U0614+091 ACIS-S/HETG GRB090113 ACIS-S Jan 19 4U0614+091 ACIS-S/HETG RXJ0720-3125 HRC-S/LETG Jan 20 SDSSJ105158.74+4017 ACIS-S 0953+254 ACIS-S 0707+476 ACIS-S SS7317 ACIS-S/HETG Radiation Belts SS7317 ACIS-S/HETG Jan 21 4U0614+091 ACIS-S/HETG Eta Carinae ACIS-S Jan 22 BD+303639 ACIS-S SDSSJ091342.48+3726 ACIS-S SDSSJ1134+5259 ACIS-S Jan 23 V1647Ori ACIS-I Radiation Belts SS7317 ACIS-S/HETG Jan 23 4U0614+091 ACIS-S/HETG Jan 24 Arp283 ACIS-S WR140 ACIS-I Jan 25 HESSJ1632-478 ACIS-I HESSJ1713-381 ACIS-S AXJ163524-4728 ACIS-S ESO565-G006 ACIS-I
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All spacecraft subsystems continued to support nominal operations.
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Revised: July 08, 2022