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Operations CXO Status Report

Friday 24 August 2018 9.00am EDT

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

At 9:36pm EDT on Aug 20 the EPHIN and EPHIN Input/Output (EIO) units spontaneously reset. After examining real-time and recorder dump telemetry the engineering team concluded that the reset was most likely due to a single event upset. Because the EPHIN is no longer used operationally as a ground or on-board safing monitor, no immediate commanding response was required. Real-time procedures will be developed and executed to restore EPHIN and EIO to their nominal operating configuration. There was no loss of science time due to the reset.

The schedule of targets for the next week is shown below.



------------------------------------------
        VTC0107+0112           ACIS-S       Aug 26
        LSBCF750-04            ACIS-S
        P308-21                ACIS-S       Aug 27
        1E1207.4-5209          ACIS-S
        Radiation Belts                     Aug 28
        P308-21                ACIS-S       Aug 29
        SDSSJ160111.25+4745    ACIS-S
        PSRJ1809-1917          ACIS-I       Aug 30
        P308-21                ACIS-S
        Radiation Belts                     Aug 31
        SN2011dh               ACIS-S
        CentaurusA             ACIS-I
        PSRJ1809-1917          ACIS-I       Sep  1
        1RXSJ174537.3+395128   ACIS-I
        ClGJ223533+183352      ACIS-I
        Q0000-263              ACIS-S
        RXJ0806                HRC-I
        SDSSJ000904.54-1034    ACIS-S       Sep  2
        LSBCF743-01            ACIS-S
        SDSSJ1522+2535         ACIS-I
        Radiation Belts

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

All spacecraft subsystems continued to support nominal operations.

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