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Operations CXO Status Report

Friday 13 April 2001 12.30pm EDT

Last week the observing schedule was halted twice due to high radiation associated with solar flare activity. The loads were halted on April 8 at 12:40am EDT through a ground command to execute the SI Safing SCS 107. The projected orbital radiation dose was significantly higher than the threshold allowed for ACIS. The loads were rebuilt and resumed at 9.30am EDT on Apr 9 once the radiation levels had subsided to an acceptable level. Two observations of ISO NW #1 were impacted and will be rescheduled in a future load. The load was resumed in time for the ACIS/HETG observation of NGC 3516 coordinated with XMM, RXTE, and BeppoSAX.

The loads were halted a second time at 10:51pm EDT on Apr 11 due to an autonomous trip of the radiation monitor and execution of SCS 107. The on-board loads were rebuilt and restarted at 3:16am EDT on Apr 13 once radiation levels had decreased and in time for the ACIS-S/HETG observation of Mkn 509 coordinated with the Hubble Space Telescope.

Other real-time activities last week included a procedure on Apr 7 to retract the LETG grating and the uplink of a maneuver-only load on Apr 4 to ensure an acceptable attitude though perigee following the radiation event of Apr 2.

Sol willing, the planned observations for the coming week are shown below and include an observation of V603 Aquilae coordinated with RXTE.

------------------------------------------
LBQS 1212+1445          ACIS-S       Apr 15
LBQS 1239+0955          ACIS-S
1WGA_J1420.0+0625       ACIS-S
NGC4388                 ACIS-S       Apr 16 
1WGA_J1220.6+3347       ACIS-S
B2 2236+35              ACIS-S
ISO NW #3               ACIS-I
NGC 2403                ACIS-S       Apr 17 
NGC 1316                ACIS-S
Radiation Belt
NGC4696                 ACIS-S/HETG  Apr 18
V603 Aquilae            ACIS-S/HETG  Apr 19
AQL X-1                 ACIS-S       Apr 20
Radiation Belt
S106 FIR                ACIS-I       Apr 21
M 67                    ACIS-I
NGC 4552                ACIS-S       Apr 22

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

All spacecraft subsystems continued to operate nominally.

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