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Operations CXO Status Report

Friday 4 June 2004 8.30am EDT

During the last week Chandra completed the observing schedule as planned.

A real-time procedure was completed on June 1 to patch the angular momentum auto-unload threshold and dead-zone constants in CPE-A. The auto-unload threshold was raised to agree with the value in the OBC, while the dead-zone was raised to keep the duration of the unloads unchanged. This patch reduces the possibility of an unnecessary momentum unload shortly after safe-mode entry when the thermal environment of the MUPS thrusters is unconstrained.

A real-time procedure was completed on June 3 to patch the ACIS flight software. The uplink and comparison with ground image were completed nominally. The patch corrects an occasional error in raw-mode runs in which rows of CCD pixels were dropped from output telemetry and provides a modification that will allow for the future addition of timed-exposure modes without increasing code or testing complexity.

Two Chandra press releases were issued on Jun 1 and 2 in conjunction with the AAS meeting. The first made jointly with the Spitzer Science Institute and the Space Telescope discussed the Great Observatories Origins Deep Survey (GOODS), and the second describing evidence that a gamma-ray burst occurred in our Galaxy a few thousand years ago. For details see:
http://chandra.harvard.edu/photo/2004/goodsbh/
http://chandra.harvard.edu/photo/2004/w49b/

The schedule of targets for the next week is shown below.

------------------------------------------
Radiation Belts                     Jun 6
SN2004C                ACIS-S
NGC3077/M81 Field      HRC-I        Jun 7
Daddi field - 1        ACIS-I
FTM 1004+1229          ACIS-S
J1715+2145             ACIS-S
RXCJ2011.3-5725        ACIS-I
RXCJ0232.2-4420        ACIS-I       Jun 8 
Radiation Belts
Arches Cluster         ACIS-I       Jun 9 
eps Pav                ACIS-I       Jun 10
DLS J0518-4849         ACIS-I
Daddi field - 2        ACIS-I
Radiation Belts                     Jun 11
Mrk 463                ACIS-S
Sculptor Dwarf Sph     ACIS-S       Jun 12
Daddi field - 3        ACIS-I
PC 1450+3404           ACIS-S
NGC 40                 ACIS-S       Jun 13

------------------------------------------

All spacecraft subsystems continued to support nominal operations.

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