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Operations CXO Status Report

Friday 29 November 2002 7.30am EST

Last week the observing schedule was halted due to high radiation associated with solar flare activity. The loads were halted on Nov 26 at 7:02pm EST through a ground command to execute the SI Safing SCS 107. This ensured that the accumulated radiation dose for ACIS remained below the allowed threshold. Loads were restarted at 10:30pm EST on Nov 27. Observations of BR 2213-6729, SNR1987A, PSR J1016-5857, HS 1251+2636 and J132512+112329 (total 90.5 Ks) were impacted by the event and will be rescheduled in a later load.

Of note last week was the announcement of Very Large Observing Projects available to proposers in Cycle 5. Up to 3 million seconds have been allocated for projects requiring 1 million seconds or more. For details see

The observing schedule for next week is shown below and includes an observation of M31 coordinated with the Hubble Space Telescope. The load also includes the commanding to conduct an aspect camera dark current calibration on Dec 3.

NGC 4725                ACIS-S       Dec 2
First 1423+2241         ACIS-S
RXJ1331.5+1108          ACIS-S
First 0747+2739         ACIS-S       Dec 3
NGC4457                 ACIS-S
Radiation Belts                      Dec 4
RXJ1256.0+2556          ACIS-S
HZ43                    HRC-S/LETG
1310                    ACIS-S       Dec 5
NGC2146                 ACIS-S
DA 495                  ACIS-I
G054.4-0.3              ACIS-I
M31-T6                  ACIS-I       Dec 6
L1527                   ACIS-I
Radiation Belts
LNS1                    ACIS-S       Dec 7
0406-244                ACIS-S
2MASS202421-572344      ACIS-S
2MASS202551-495813      ACIS-S
3C403                   ACIS-S
MACSJ2049.9-3217        ACIS-I       Dec 8
W51 South               ACIS-I
W51 North               ACIS-I
RX J193228.6+345318     ACIS-S


All spacecraft subsystems continued to operate nominally.

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