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Operations CXO Status Report

Friday 12 December 2008 7.00am EDT

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

Real-time procedures were conducted on Dec 9 to reconfigure the radiation detector, EPHIN, and to load a related flight software patch to the RadMon process. The EPHIN reconfiguration will counter the effect of increasing detector deadtime from operating at elevated temperatures. The RadMon patch modifies which EPHIN coincidence channels are monitored and sets new thresholds that define a high-radiation environment. The patch includes using the HRC multi-channel plate rate as a channel for the identification of a high-radiation environment. These changes will provide Chandra with more robust radiation protection given the on-going thermal conditions.

A real-time procedure was also conducted on Dec 9 to dump OBC-A memory as a follow-up to the RadMon patch. The dump will be used to update the baseline memory image maintained on the ground.

The schedule of targets for the next week is shown below and includes an observation of M31 coordinated with XMM-Newton.

------------------------------------------
Radiation Belts                     Dec 14
GRB081007              ACIS-S       Dec 15
SN1996cr               ACIS-S/HETG
Alpha Centauri         HRC-I        Dec 16
HD119682               ACIS-S/HETG  Dec 17
Radiation Belts
M31                    HRC-I        Dec 18
RXCJ0352.9+1941        ACIS-S
M31                    HRC-I
3C98                   ACIS-I
GRB081007              ACIS-S
HD119682               ACIS-S/HETG  Dec 19
SN1996cr               ACIS-S/HETG
Radiation Belts                     Dec 20
HD119682               ACIS-S/HETG
Abell 0598             ACIS-I       Dec 21
HD119682               ACIS-S/HETG
SDSSJ080859.33+2047    ACIS-S       Dec 22
SDSSJ0810+34585        ACIS-S
SN1996cr               ACIS-S/HETG

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

All spacecraft subsystems continued to support nominal operations.

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