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Operations CXO Status Report

Friday 24 October 2008 7.30am EDT

Chandra entered Normal Sun Mode (NSM) at 4:24 pm on Saturday Oct 18 as the result of a reset of the Interface Unit (IU) on-board the spacecraft. Entry into NSM was nominal and assessment of the telemetry indicated that all spacecraft hardware was performing nominally. Engineering assessment suggested that the reset of the IU and subsequent transition to NSM was due to a single event upset and the decision was made to recover to normal pointing mode and continue with science. The recovery took place on Oct 19-20 and science was resumed on Oct 21 at 7:54 am. A full fault tree analysis of the anomaly will be conducted. Science targets that were impacted by the anomaly will be rescheduled in a future load.

In addition to the real-time procedures associated with the NSM recovery, the on-board Ephemeris was updated on Oct 20.

The schedule of targets for the next week is shown below and includes an observation of BRI0021-0214 coordinated with the VLA.

------------------------------------------
Radiation Belts                     Oct 25
        1E1547.0-5408          ACIS-S       Oct 26
        SN1996cr               ACIS-S
        XTEJ1734-234           HRC-I        Oct 27
        0119+115               ACIS-S
        NGC23                  ACIS-S
        J1835-1106             ACIS-I
IGRJ18462-0223         ACIS-I
J1730-3350             ACIS-I
NGC6522                ACIS-S
NGC6569                ACIS-S
Radiation Belts                     Oct 28
PDCS-016               ACIS-I
cl0340-2840            ACIS-I
BRI0021-0214           ACIS-I       Oct 29
NGC57                  ACIS-S
AXJ1732.2-3044         ACIS-I
WR18                   ACIS-S
NGC6642                ACIS-S
NGC6553                ACIS-S       Oct 30
IGRJ17586-2129         ACIS-I
ISCS1036+1088          ACIS-I
LEDA37241              ACIS-I
IGRJ12275+3759         ACIS-I
Radiation Belts               
NGC6539                ACIS-S       Oct 31
F01166-0844            ACIS-S
PSRJ1843-1113          HRC-S 
IGRJ12422+3526         ACIS-I       Nov  1
S99                    ACIS-S
NGC6540                ACIS-S
BHR71-MM               ACIS-I
PDCS-016               ACIS-I
F00091-0738            ACIS-S
NGC6637                ACIS-S
IGRJ17487-3124         ACIS-I       Nov  2
IGRJ17448-3232         ACIS-I
PG1115+080             ACIS-S

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

All spacecraft subsystems continued to support nominal operations.

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