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Operations CXO Status Report

Friday 15 September 2000 9.30am EDT

During last week the observing schedule was replanned to include the dwarf nova SS Cygni which was accepted as a Target Of Opportunity (TOO) on 10 Sept following an outburst from the source. The target was scheduled to coincide with simultaneous observations by EUVE.

The schedule was re-planned a second time following a high radiation event at 3:15pm EDT on Sept 13 that stopped the daily load and activated the science instrument safing sequence (SCS 107). All actions were nominal and assessment of the dump data confirmed that the trigger was due to high proton counts in the EPHIN P4GM channel exceeding the pre-defined threshold of 300 counts/cm^2/s/sr.

The revised schedule from Sept 12 is shown below. The observations of 1H 0707-495 and U Gem scheduled for this week were not performed due to either the TOO or the radiation event, and will be re-scheduled in an upcoming load.

X1543-62                ACIS-S/HETG  Sep 12 
*TOO SS Cygni           ACIS-S/HETG
Eclipse-6 (69.1 min)
Radiation Belts                      Sep 13
*High Radiation Trigger
*TOO SS Cygni           ACIS-S/HETG  Sep 14 
AR Lac-3                ACIS-S/HETG  Sep 15 
Eclipse-7 (53.6 min)
Radiation Belts
AR Lac-2                ACIS-S/HETG  Sep 16 
4U 1626-67              ACIS-S/HETG

The observatory passed through the fifth and sixth eclipses of the Fall 2000 season with nominal power and thermal performance. The final eclipses for the season are as follows:

Eclipse 7    8:29 pm EDT    15 Sept 2000     53.6 min
Eclipse 8   12:20 pm EDT    18 Sept 2000     26.2 min (short eclipse)

The software patch for the short eclipse will be uplinked on 16 Sept.

The planned observations for the coming week are as follows.

Tau Sco ACIS-S/HETG Sep 16 AR Lac-4 ACIS-S/HETG Sep 17 Eclipse-8 (26.2 min) Sep 18 Radiation Belts 0509-67.5 ACIS-S/HETG AR Lac-6 ACIS-S/HETG Sep 19 0509-67.5 ACIS-S/HETG AR Lac-5 ACIS-S/HETG Sep 20 Tycho SNR ACIS-S Radiation Belts M31 Transient ACIS-S Sep 21 IC 348 ACIS-I Betelgeuse ACIS-I Sep 22 Betelgeuse ACIS-S Vela ACIS-I BAL 2359-1241 ACIS-S Sep 23 Radiation Belts N23 ACIS-S Sep 24


All spacecraft subsystems continued to operate nominally.

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