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Operations CXO Status Report

Friday 5 September 2003 10.30am EDT

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

Real-time procedures were completed on Sep 2 to uplink and test a software patch to modify the threshold criteria for triggering science instrument safing under high radiation conditions. The change increases the number of sequential frames from EPHIN required to trigger a high radiation condition from 4 to 10 and will significantly reduce the number of unwanted triggers just prior to radiation belt entry. The uplink and test proceeded nominally.

A Chandra image release was issued on September 3 showing the aftermath of a glancing collision between two galaxies in the Virgo cluster.

For details see: http://chandra.harvard.edu/photo/2003/ngc4438/.

The observing schedule for next week is shown below:

------------------------------------------
Radiation Belts                      Sep 7
G11.2-0.3               ACIS-S       Sep 8
H 1426+428              ACIS-S/HETG
PSS 1646+5514           ACIS-S       Sep 9
2MASS153628+614642      ACIS-S
7C 1745+6227            ACIS-S
BO 375                  HRC-I
BR 0353-3820            ACIS-S       Sep 10
SDSSJ015652.43-001222.0 ACIS-S
Radiation Belts
SDSS J222509-001406     ACIS-S
ABELL 2390              ACIS-S
NGC 1705                ACIS-S       Sep 12
Radiation Belts
V834 CENTAURI           ACIS-S/HETG  Sep 13
AX J1845-0258           ACIS-S       Sep 14
NGC 5204 X-1            ACIS-S
CENTAURUS A             ACIS-S

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

All spacecraft subsystems continued to operate nominally.

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