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Operations CXO Status Report

Friday 4 January 2019 9.00am EST

During the last week the observing schedule was replanned to increase the planning thermal margin for certain ACIS calibration observations during perigee. No science observations were impacted.

In detailed analysis of data for the Winter 2018 eclipse season, an anomaly was identified in the full charge current supplied by the Solar Array to Battery 3. During the eclipse on Dec 20, Chandra lost one of the five full charge Solar Array strings connected to Battery 3, resulting in a 20% reduction in full charge current. This level of current is sufficient for normal operations. The full charge current for Batteries 1 and 2 remains nominal, and the Solar Array power delivered directly to the spacecraft load bus was not impacted.

Chandra passed through the eighth (and final) eclipse of the season on Dec 30, with nominal thermal performance. The time required to recharge Battery 3 was longer than expected due to the Solar Array anomaly, but otherwise power performance was nominal.

Real-time procedures were executed on Dec 30 to disable SCS-29 and to dump and clear the EPS glitch counters as post-eclipse season actions. Another real-time procedure was executed on Jan 2 to perform a routine self-check of the Electrical Interface Assembly (EIA) Sequencer.

The schedule of targets for the next week is shown below and includes an observation of 3FGL J1544-1125 coordinated with HST.



------------------------------------------
        Q2237+0305             ACIS-S       Jan  7
        SPT-CLJ2259-5301       ACIS-I
        Radiation Belts                     Jan  8
        SPT-CLJ2259-5301       ACIS-I
        3FGLJ1544-1125         ACIS-S
        PSS0926+3055           ACIS-S
        A773                   ACIS-I
        HD146413               ACIS-S       Jan  9
        PSRJ2018+2839          ACIS-S
        A773                   ACIS-I
        IGRJ20084+3221         ACIS-I
        1RXSJ235324.6-125657   ACIS-I
        SPT-CLJ2259-5301       ACIS-I       Jan 10
        Radiation Belts
        PS16dtm                ACIS-S
        SPT-CLJ2259-5301       ACIS-I       Jan 11
        lCar                   ACIS-I
        CGCG032-017            ACIS-S
        A773                   ACIS-I
        SN2004dk               ACIS-S
        IGRJ19504+3318         ACIS-I       Jan 12
        A773                   ACIS-I
        SDSSJ093106.75+4904    ACIS-S
        SDSSJ084533.28+4749    ACIS-S
        Radiation Belts                     Jan 13
        Q2237+0305             ACIS-S
        PSRJ0814+7429          ACIS-S
        A773                   ACIS-I

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

All spacecraft subsystems continued to support nominal operations.

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