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Operations CXO Status Report

Friday 14 May 2021 9.00am EDT

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

At 1:06 am EDT on May 12, the on-board F_ECLIPSE flag in the On-Board Computer indicated an eclipse state for a single readout while not in eclipse. Due to a confluence of nominal onboard conditions with regards to equipment states, a maneuver in progress, and the random nature of heater cycles, the power demand on the load bus momentarily dropped to an historically low level. The power output from the Y solar array briefly dropped to the on-board limit which triggers eclipse load configuration setup via SCS 29. In this case there was no change to the configuration required and the event was benign. A real-time activity was executed on May 13 to disable and then re-activate SCS 29 in preparation for the next eclipse of the season. Analysis is underway to determine if the eclipse power limit needs to be lowered to better account for the normal variations in power demand, as was done in the fall of 2020.

Preparations were completed for the Spring 2021 eclipse season; the season contains 10 eclipses and runs from May 11 to June 3. Real-time procedures were executed on May 9 to prepare for the first eclipse: one to activate SCS 29 and one to dump and clear the EPS glitch counters. Chandra passed through the first and second eclipses of the season on May 11 and 13, with nominal power and thermal performance.

The schedule of targets for next week is shown below and includes observations of IC 1657 coordinated with NuSTAR, an observation of Sgr A* coordinated with VLTI-Gravity, and observations of MAXI J1803-298, which was accepted as a Director's Discretionary Time Target of Opportunity on May 7.



------------------------------------------
        SN2014df               ACIS-S       May 16
        CasJ005311             ACIS-I
        HD221416               ACIS-S       May 17
        MAXIJ1803-298          ACIS-S/HETG
        WISEAJ213202.20-3342   ACIS-S
        CasJ005311             ACIS-I
        2RXSJ161816.6+09120    ACIS-I
        KeplerSNR              ACIS-S/HETG
        2MASSJ20320890-4742    ACIS-S       May 18
        IC1657                 ACIS-S
        KeplerSNR              ACIS-S/HETG
        Radiation Belts                     May 19
        PSZ2G126.57+51.61      ACIS-S
        XIBOO                  HRC-I
        SS433                  ACIS-S/HETG
        H1821+643              HRC-S /LETG
        HD202772               ACIS-S       May 20
        GDHIdp41               ACIS-I
        GDHIdp41               ACIS-I
        GDHIdp41               ACIS-I
        GDHIdp41               ACIS-I
        GDHIdp41               ACIS-I
        GDHIdp41               ACIS-I
        TOI-132                ACIS-S
        Tycho'sSNR             ACIS-I
        2RXSJ162820.2+01063    ACIS-I
        Tycho'sSNR             ACIS-I
        SS433                  ACIS-S/HETG  May 21
        Radiation Belts
        AHCep                  ACIS-S
        2RXSJ200845+223911     ACIS-I       May 22
        SS433                  ACIS-S/HETG
        IRAS16382-0613         ACIS-S
        AHCep                  ACIS-S
        SgrA*                  ACIS-S
        HZ43                   HRC-I /LETG  May 23
        H1821+643              HRC-S /LETG
        2MASXJ08244333+29592   ACIS-S
        MAXIJ1803-298          ACIS-S/HETG
        Radiation Belts

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

All spacecraft subsystems continued to support nominal operations.

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