Operations CXO Status Report

Monday 5 June 2000 10.00am EDT

During the last week, Chandra completed the observing schedule as planned. A routine real-time procedure was completed on 5/29 to dump the CPE warm start counter and showed no change in value (1). A momentum auto-unloading event was performed by Chandra for the first time on 6/1/00 at 1:19pm EDT. Momentum unloading is normally predicted and performed via stored commands from the daily load, so the auto-unload was unexpected. The unloading was near perigee where a gravity gradient torque larger than predicted is suspected. The auto-unloading proceeded nominally. The planned observations for the coming week are as follows.

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PSR B0540-69           HRC-I/-S/ACIS-S Jun  5
B1138-262              ACIS-S
CB 58                  ACIS-S          Jun  6
V1494AQL               ACIS-I
Vega                   ACIS-S/HRC-I/-S Jun  7
Radiation Belts
AX J1025+4714          ACIS-I
Cen Cluster            ACIS-S
Cir X-1                ACIS-S/HETG     Jun  8
MCG-6-30-15            ACIS-S/HETG
X0918-54               ACIS-S/HETG
RXTE J1550-564 (TOO)   ACIS-S/HETG     Jun  9
4U 1735-44             ACIS-S/HETG
1746-331               ACIS-S
1711-339               ACIS-S
Radiation Belts
HD 113703              ACIS-S          Jun 10
HD 129791              ACIS-S
HE 1104-1805           ACIS-S
MS 1008.1-1224         ACIS-I          Jun 11

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All spacecraft subsystems continued to operate nominally.

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