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Operations CXO Status Report

Friday 4 June 2021 9.00am EDT

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

A real-time procedure was completed on May 28 to uplink a flight software patch to modify three Electrical Power System (EPS) K-constants. The new settings will prevent the EPS F_Eclipse flag from inadvertently toggling while the spacecraft is in sunlight. The change is needed due to expected long-term changes in solar array characteristics. Additional real-time procedures were executed on May 29-30 to dump OBC-A and -B memory as a follow-up to the patch. The dump will be used to update the baseline memory images maintained on the ground.

Additional real-time procedures were executed on Jun 2 to perform a routine self-check of the Electrical Interface Assembly (EIA) Sequencer and to perform a diagnostic dump of the Control Processing Electronics (CPE).

Chandra passed through the eighth, ninth, and tenth (and final) eclipses of the season on May 29, Jun 1 and Jun 3 respectively, with nominal power and thermal performance. Real-time procedures were executed on Jun 4 to disable SCS-29 and to dump and clear the EPS glitch counters as post-eclipse season actions.

The schedule of targets for the next week is shown below and includes an observation of AT2020xnd, which is a follow-up to a Target of Opportunity accepted on Oct 26, 2020 and is coordinated with NuSTAR, and observations of AT2019avd, which was accepted as a Director's Discretionary Time Target of Opportunity on May 31.

        CMZMolecularCloud      ACIS-I       Jun  7
        AT2020xnd              ACIS-S
        CMZMolecularCloud      ACIS-I
        TOI-172                ACIS-S
        M51                    ACIS-S
        CasA                   ACIS-I       Jun  8
        WR97                   ACIS-S
        AT2019avd              HRC-S /LETG
        Radiation Belts                     Jun  9
        Westerlund1            ACIS-I
        2RXSJ154551.5-17570    ACIS-I
        AT2019avd              HRC-S /LETG
        3C273                  ACIS-S/HETG  Jun 10
        Vega                   HRC-I
        Vega                   HRC-S
        Vega                   HRC-S
        Vega                   HRC-S
        Vega                   HRC-S
        HZ43                   HRC-S /LETG
        Westerlund1            ACIS-I
        QSOJ1131-1231          ACIS-S       Jun 11
        Radiation Belts
        Westerlund1            ACIS-I       Jun 12
        WR97                   ACIS-S
        HD202772               ACIS-S
        NGC4485/90             ACIS-S
        PGC835095              ACIS-S
        4U1636-53              ACIS-S/HETG
        SNR0519-69.0           ACIS-S       Jun 13
        Westerlund1            ACIS-I


All spacecraft subsystems continued to support nominal operations.

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