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Friday 24 October 2008 7.30am EDT
| Chandra entered Normal Sun Mode (NSM) at 4:24 pm on Saturday Oct 18 as
the result of a reset of the Interface Unit (IU) on-board the
spacecraft. Entry into NSM was nominal and assessment of the telemetry
indicated that all spacecraft hardware was performing
nominally. Engineering assessment suggested that the reset of the IU
and subsequent transition to NSM was due to a single event upset and
the decision was made to recover to normal pointing mode and continue
with science. The recovery took place on Oct 19-20 and science was
resumed on Oct 21 at 7:54 am. A full fault tree analysis of the anomaly
will be conducted. Science targets that were impacted by the anomaly will
be rescheduled in a future load.
In addition to the real-time procedures associated with the NSM recovery, the on-board Ephemeris was updated on Oct 20. The schedule of targets for the next week is shown below and includes an observation of BRI0021-0214 coordinated with the VLA. |
------------------------------------------
Radiation Belts Oct 25
1E1547.0-5408 ACIS-S Oct 26
SN1996cr ACIS-S
XTEJ1734-234 HRC-I Oct 27
0119+115 ACIS-S
NGC23 ACIS-S
J1835-1106 ACIS-I
IGRJ18462-0223 ACIS-I
J1730-3350 ACIS-I
NGC6522 ACIS-S
NGC6569 ACIS-S
Radiation Belts Oct 28
PDCS-016 ACIS-I
cl0340-2840 ACIS-I
BRI0021-0214 ACIS-I Oct 29
NGC57 ACIS-S
AXJ1732.2-3044 ACIS-I
WR18 ACIS-S
NGC6642 ACIS-S
NGC6553 ACIS-S Oct 30
IGRJ17586-2129 ACIS-I
ISCS1036+1088 ACIS-I
LEDA37241 ACIS-I
IGRJ12275+3759 ACIS-I
Radiation Belts
NGC6539 ACIS-S Oct 31
F01166-0844 ACIS-S
PSRJ1843-1113 HRC-S
IGRJ12422+3526 ACIS-I Nov 1
S99 ACIS-S
NGC6540 ACIS-S
BHR71-MM ACIS-I
PDCS-016 ACIS-I
F00091-0738 ACIS-S
NGC6637 ACIS-S
IGRJ17487-3124 ACIS-I Nov 2
IGRJ17448-3232 ACIS-I
PG1115+080 ACIS-S------------------------------------------
All spacecraft subsystems continued to support nominal operations.
Return to Status Reports
Revised: July 08, 2022