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Operations CXO Status Report

Friday 3 February 2023 9.00am EST

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

A real-time procedure was executed on Jan 27 to perform part of an annual check-out of A-side MUPS thrusters, which are selected for use when Chandra is in its safe-mode configuration. Thruster A3 was fired and performed nominally. An additional procedure was performed to open Isolation Valve 3 (MUPS A) which was closed during the thruster check-out procedure.

Another real-time procedure was executed on Feb 1 to swap the prime solid-state recorder (SSR) from the B-side to the A-side. This swap concludes a six-month interval of health and trending data collection on SSR-B. Real-time procedures were also executed on Feb 1 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).

A Chandra image release was issued on Jan 30 describing observations a spectacular, ongoing collision between at least three galaxy clusters. The giant galaxy cluster forming from this collision is Abell 2256. The composite image of Abell 2256 combines X-rays from Chandra and XMM with radio data collected by the Giant Metrewave Radio Telescope (GMRT), the Low Frequency Array (LOFAR), and the Karl G. Jansky Very Large Array (VLA), plus optical and infrared data from Pan-STARRs. Collisions and mergers like this are the main way that galaxy clusters can grow into the gigantic cosmic edifices seen today. These also act as the largest particle accelerators in the universe. For details see:

Of note this week was the release on Jan 31 of CIAO 4.15.1. The primary changes introduced in the patch updates to support NumPy version 1.24, Updates to the ciao-contrib package and an upgrade to version 8.4.1 of SAOImage DS9. For details see:

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

        L168-9                 ACIS-S       Feb  5
        [MOK2016b]HSCJ0935     ACIS-S
        L168-9                 ACIS-S       Feb  6
        cenx-3                 ACIS-S/HETG
        DELSJ091054.53-0414    ACIS-I
        cenx-3                 ACIS-S/HETG
        [MOK2016b]HSCJ0935     ACIS-S
        Radiation Belts                     Feb  7
        GX9+1                  ACIS-S/HETG
        GW170817               ACIS-S
        A3562                  ACIS-I       Feb  8
        SDSSJ094851.76+11495   ACIS-S
        GX9+1                  ACIS-S/HETG
        2MASXJ09471846+1345    ACIS-S       Feb  9
        GX9+1                  ACIS-S/HETG
        2MASXJ13003807+5454    ACIS-S
        Radiation Belts                     Feb 10
        MKN421                 ACIS-S/LETG
        SDSSJ101106.74+1147    ACIS-S
        GX9+1                  ACIS-S/HETG
        MKN421                 ACIS-S/LETG
        cenx-3                 ACIS-S/HETG
        LEDA1136566            ACIS-S       Feb 11
        IGRJ16327-4940         ACIS-I
        DELSJ091054.53-0414    ACIS-I
        IGRJ16113-4200         ACIS-I
        1RXSJ165745.2-32500    ACIS-I
        3C286                  ACIS-S       Feb 12
        Radiation Belts
        LEDA1136566            ACIS-S


All spacecraft subsystems except HRC continued to support nominal operations.

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