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Operations CXO Status Report

Friday 26 March 2021 9.00am EDT

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

A real-time procedure was executed on Mar 22 to temporarily raise the HRC-S microchannel plate high voltage settings during a calibration observation. The data collected will be used to update the standard high voltage settings during science observations in order to account for the expected drop in the detector gain during the mission.

A flight software patch was uplinked on Mar 24 to update the stored-command sequence that is used to raise the HRC-I microchannel plate high voltage to the operational level. The update increases the magnitude of the voltage in order to recover a slight loss in X-ray detection efficiency observed over the twenty-one years of operation. Additional real-time procedures were executed on Mar 25 to dump OBC-A memory as a follow-up to the flight software patch. The dump will be used to update the baseline memory image maintained on the ground.

Chandra image releases were issued on Mar 24 featuring "sonified" representations of data on three extensively-studied, iconic cosmic objects: the Chandra Deep Field, the Cat's Eye Nebula, and the galaxy Messier 51. The sonifications, made by combining data from Chandra with additional data from Hubble, Spitzer, and ground-based telescopes, represent astronomical information conventionally presented visually instead by a succession of sounds. For details, see:

The schedule of targets for the next week is shown below and includes observations of TW Hya coordinated with HST.

        4FGLJ1329.9-6108       ACIS-I       Mar 28
        TOL31                  ACIS-S
        MCG-03-34-064          ACIS-S
        SN2011hs               ACIS-S
        IISZ10                 ACIS-S       Mar 29
        PSZ2G282.28+49.94      ACIS-I
        J075051.72+245409.3    ACIS-S
        J075949.54+320023.8    ACIS-S
        Radiation Belts
        MGJ0414+0534           ACIS-S
        PSZ2G282.28+49.94      ACIS-I       Mar 30
        TWHya                  HRC-S /LETG
        SNR1987A               HRC-I
        TWHya                  HRC-S /LETG  Mar 31
        2MASSJ12150885+4843    ACIS-S
        JWST-DTDF-1            ACIS-I
        Radiation Belts                     Apr  1
        M51                    ACIS-S
        PSRJ0821-4300          HRC-S /LETG
        TWHya                  HRC-S /LETG  Apr  2
        HE0435-1223            ACIS-S
        TWHya                  HRC-S /LETG
        ESO383-18              ACIS-S       Apr  3
        CGCG17-73              ACIS-S
        PSRB2224+65            ACIS-I
        Radiation Belts                     Apr  4
        NGC4992                ACIS-S
        ArLac (21 obs)         HRC-I


All spacecraft subsystems continued to support nominal operations.

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