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Operations CXO Status Report
Friday 20 December 2002, 9.00am EST
During the last week Chandra completed the observing schedule as
planned.
During a real-time pass on 19 Dec the ACIS Digital Processing Assembly
(DPA-A) was seen in an unexpected powered-off state. Assessment of the
real-time telemetry indicated behavior consistent with a similar DPA
turn-off in October 2000. In that case fault-tree analysis concluded
the event was due to a single event upset. The DPA was powered back on
and the required software patches reloaded during a real-time pass at
1am on Dec 20. Since the power-off and power-on occurred within the
radiation belt zone, no science was lost due to the event. Further
engineering analysis will be performed.
A real-time procedure was completed on Dec 19 to disable an aberration
adjustment made in the OBC software. The adjustment has been disabled
to accommodate the accuracy requirements of a series of observation of
the Crab nebular that will be occulted by Saturn's moon Titan on Jan 5.
Of note last week was the conduct of the Chandra User's Committee
meeting on Dec 17-18.
The mission planning team completed work on the 2-week schedule to
span the holiday period. The schedule of observations is shown below
and includes the occultation observation of Titan.
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MACS-J2243.3-0935 ACIS-I Dec 23
MR2251-178 HRC-S/LETG
NGC 1365 ACIS-S Dec 24
MACS-J0329.6-0211 ACIS-I
Z03521+0028 ACIS-S
Radiation Belts Dec 25
NGC 1265 ACIS-S
MACSJ2228.5+2036 ACIS-I Dec 26
3C 438 ACIS-S Dec 27
Radiation Belts Dec 28
A665 ACIS-I
1E0953.8+6918 ACIS-S
RCS1620+2929 ACIS-S Dec 28
AX J1532.3+2401 ACIS-S Dec 29
NGC5953 ACIS-S
M87 ACIS-S
4U 1145-619 ACIS-S
0506-68.0 ACIS-S
Radiation Belts Dec 30
SNR1987A ACIS-S
MYCN 18 ACIS-S Dec 31
DEM L50 ACIS-S Jan 1
EIS0954-2023/22 ACIS-S
LBSQ1009-0252 ACIS-S
PC 1015+4752 ACIS-S
2MASS093844+005716 ACIS-S
Radiation Belts Jan 2
3C215 ACIS-S
SDSS J141234.68-003500 ACIS-S Jan 3
NGC 5845 ACIS-S
GRB021201 ACIS-I
NGC2623 ACIS-S
MACS-J0744.8+3927 ACIS-I
RX J045707.4+452751 ACIS-S Jan 4
RXJ0439.0+0715 ACIS-I
Radiation Belts
Titan ACIS-S/HETG Jan 5
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All spacecraft subsystems continued to operate nominally.
The next report is planned for January 3 following the holiday. A
Happy Holiday and New Year to everyone from the entire Chandra Team!
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