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Operations CXO Status Report

Friday 29 March 2024 9.00am EDT

During the last week the observing schedule was interrupted by a high-radiation event that activated the science instrument safing sequence (SCS 107) and stopped observing at at 7:34am EDT on Mar 24. All spacecraft actions were nominal. Loads for a replanned schedule were uplinked on Mar 25. Planned observations of AGC 724821, IGR J18172-1944, EP240315A, 2MASSJ08194059+0823, 4C+62.29, NGC4261, and NGC6204 were impacted by the interruption and will be rescheduled.

Real-time procedures were executed on Mar 28 to perform a dump of the IU-A EEPROM and diagnostic memory dumps of the Command and Telemetry Unit (CTU) EEPROMs.

Chandra passed through the 26th, 27th, and 28th eclipses of the season on Mar 23, 25, and 28 respectively, with nominal power and thermal performance.

A Chandra image release was issued on Mar 27 showing the stunning echo of an 800-year-old explosion in SNR 1181. This supernova has been associated with Pa 30, a nearly circular nebula with a central star in the constellation Cassiopeia. The new composite image uses data across the electromagnetic spectrum and shows a spectacular new view of the supernova remnant. This allows us to marvel at the same object that appeared in our ancestors’ night sky more than 800 years ago. For details see:

The schedule of targets for the next week is shown below and includes an observation of ZTF19acnskyy, which was accepted as a Director's Discretionary Time Target of Opportunity on Mar 25, and an observation of EP240222a, which was accepted as a Director's Discretionary Time Target of Opportunity on Mar 26.

        SDSSJ074521.78+47343   ACIS-S       Apr  1
        VCC1725                ACIS-S
        EP240222a              HRC-I
        70OPH                  HRC-I
        SNRG310.6-1.6          ACIS-S
        SDSSJ0921+2854         ACIS-S       Apr  2
        [APH2018]SDSSJ1020     ACIS-I
        Radiation Belts
        PSRJ1813-1749          ACIS-S       Apr  3
        HD115247               HRC-S /LETG
        NGC6204                ACIS-I
        ZTF19acnskyy           ACIS-S
        HD115247               HRC-S /LETG
        HS1549Protocluster     ACIS-S
        SgrA*                  ACIS-S       Apr  4
        HD115247               HRC-S /LETG
        4C+50.55               ACIS-S
        MCXCJ0928.6+3747       ACIS-I
        Radiation Belts                     Apr  5
        NVSSJ041008-013918     ACIS-S
        IRAS_12071m0444_s1     ACIS-S
        NVSSJ041008-013918     ACIS-S       Apr  6
        SDSSJ101956.59+4319    ACIS-S
        SgrA*                  ACIS-S
        HD115247               HRC-S /LETG
        MCG+4-48-2             ACIS-S
        WISEAJ183957.76+380    ACIS-S
        SDSSJ130534.49+1819    ACIS-S       Apr  7
        SDSSJ121056.92+6105    ACIS-S
        SDSSJ075658.87+5038    ACIS-S
        [APH2018]SDSSJ1020     ACIS-I
        Radiation Belts


All spacecraft subsystems continued to support nominal operations.

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