Chandra Operations CXO Status Report 21 June 2002

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

A real-time procedure was completed successfully on June 17 to check the bright earth limb limitation with the aspect camera during perigee passage. One issue identified during the procedure was that a series of hardware commands sent from the daily load to the aspect camera to acquire monitor windows was not executed. The issue is under investigation.

Initial assessment of the results from the earth limb check shows consistency with prior measurements made in November 2001. The camera remains locked on stars to within ~4-5 degrees of the bright earth (this compares with the 20 degree current limitation). Further measurements are planned before a constraint change can be considered.

The observing schedule for the next week is shown below and includes two observations of Her X-1 that are phase constrained.

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BRI2235-0301                         Jun 23
1AXG J010952-1252       ACIS-I
AX J0146.2-0354         ACIS-S       Jun 24
A133                    ACIS-I
NGC 985                 ACIS-S/HETG
Radiation Belts                      Jun 25
RXJ0027.6+2616          ACIS-I       Jun 26
1AXG J003331-2139       ACIS-I
HS 2135+1326            ACIS-S
A133                    ACIS-I
HD 150136               ACIS-S/HETG  Jun 27
Radiation Belts                      Jun 28
GRS 1758-258            HRC-I
Her X-1                 ACIS-S/HETG
AX J1354.0+3346         ACIS-S       Jun 29
Her X-1                 HRC-S/LETG0-binMACSJ1427.6-2521        ACIS-I
TON 1388                HRC-S/LETG
IRAS 11119+3257         ACIS-S       Jun 30
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All spacecraft subsystems continued to operate nominally.