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Friday 29 January 2010 9.00am EDT
| During the last week two observations were impacted on Jan 25 when the
ACIS instrument experienced an unexpected Back End Processor (BEP)
reboot. The event resulted in a reversion to the pre-launch version of
the ACIS flight software. A real-time procedure was run on Jan 25 to
restart the ACIS software housekeeping reporting and to dump the
contents of the ACIS software patch memory. The anomalous event had
also erased the software patches from memory. A second real-time
procedure was run on Jan 25 to reload the patches and reboot the ACIS
BEP. A third real-time procedure was completed on Jan 26 to reset the
ACIS focal-plane control point to -121 degree C as a final clean-up
action following the anomaly. The ACIS team has begun an investigation
into the anomaly that will include a careful comparison with previous
events of this kind.
The schedule of targets for the next week is shown below. |
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Radiation Belts Jan 31 SN2009mk ACIS-S KTEri HRC-S/LETG Q0957+561 ACIS-S Feb 1 PG1115+080 ACIS-S CheshireCatLens ACIS-S CygnusOB2 (2 obs) ACIS-I MKN421 ACIS-I/LETG Feb 2 Cygnus OB2 ACIS-I SDSSJ113657.68+4113 ACIS-S 2PIGG_m1347 ACIS-I Radiation Belts SNRE0519-69.0 ACIS-S Feb 3 GS0836-429 ACIS-I 2PIGG_m1480 (2 obs) ACIS-I 2PIGG_m1441 ACIS-I SDSSJ105755.66+4825 ACIS-S Cygnus OB2 ACIS-I M31 ACIS-I Feb 4 MKN421 ACIS-I/LETG MKN421 ACIS-I/LETG Cygnus OB2 (2 obs) ACIS-I Radiation Belts Feb 5 XMMUJ0236-5225 ACIS-I Feb 6 KTEri HRC-S/LETG MKN421 (3 obs) ACIS-I/LETG SDSSJ163159.59+2437 ACIS-S Feb 7 XMMUJ0236-5225 ACIS-I PG1115+080 ACIS-S SDSSJ155909.62+3501 ACIS-S Cygnus OB2 ACIS-I SAXJ1428.6-5422 ACIS-I Feb 8 2PIGG_m1347 ACIS-I
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All spacecraft subsystems continued to support nominal operations.
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Revised: July 08, 2022