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Operations CXO Status Report

Friday 21 September 2007 8.30am EDT

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

A test was conducted on Sept 17 to turn off the ACIS detector housing heater to assess the thermal time constant associated with the housing cooling. The heater was turned off via the daily load and then back on using a real-time procedure when the temperature fell below a pre-determined threshold. Assessment of the data indicates the thermal performance was within predictions. Turning off the heater will help offset the increasing heating trend for the Observatory that is making it more difficult to maintain the ACIS focal plane temperature at the desired set point of -120 deg C during science observations. A further test using the daily loads is scheduled for 22 Sept.

A Chandra press release was issued on 20 Sept describing evidence that stars have been forming in a long tail of gas that extends well outside its parent galaxy. This discovery suggests that such "orphan" stars may be much more prevalent than previously thought. For more details see: http://chandra.harvard.edu/press/07_releases/press_092007.html

Of note last week was the Chandra User Committee meeting held at the CXC on Sept 19-20.

The schedule of targets for the next week is shown below and includes an observation of M31 coordinated with HST.

------------------------------------------
IGR J11435-6109        ACIS-S       Sep 23
RX J1605.3+3249        HRC-S/LETG
UGC 6930               ACIS-S       Sep 24
Radiation Belts
NGC1023                ACIS-S       Sep 25
7C1037+4650            ACIS-S
Z7215                  ACIS-I       Sep 26
Crab Pulsar            HRC-S/LETG
M31                    ACIS-I
NGC2563-P3             ACIS-I
IGR J11305-6256        ACIS-I
Abell 2219             ACIS-I       Sep 27
SDSS J092152.45+51     ACIS-S
Radiation Belts
SDSS J225506.79+005    ACIS-S
IRAC Dark Field        ACIS-I       Sep 28
MACS1720.3+3536        ACIS-I
IGR J16500-3307        HRC-I
SDSSJ225506.79+005     ACIS-S
AXJ185551+0129         HRC-I
IRAC Dark Field        ACIS-I
NGC2563-P12            ACIS-I       Sep 29
NGC 6107               ACIS-S
Radiation Belts
Chandra Deep Field     ACIS-I       Sep 30

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

All spacecraft subsystems continued to support nominal operations.

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