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Friday 28 July 2006 8.00am EDT
| During the last week the observing schedule was replanned to include
an observation of PKS 2155-304 that was accepted as a one day
turn-around Target Of Opportunity (TOO) on July 27. Loads were
replanned and uplinked on July 28. An observation of M17 was impacted
by the TOO and will be rescheduled in a later load. Observations of
SDS J1235+5910, Maffei 2 and A478 were added to the schedule as a
result of the replan.
Several real-time procedures were conducted during last week associated with a flight software patch to add on-board monitoring of selected propulsion line and valve temperatures. On 25 July a patch was uplinked that replaced 21 of the Liquid Apogee Engine temperature readings (unused since the ascent phase) with 21 -Z side propulsion line and valve temperatures. A real-time procedure was performed during each contact with Chandra following the patch uplink to verify proper operation of the patch. On 27 July a patch was uplinked that implemented the new on-board monitor. Chandra has experienced decreased thermal margins as the mission has proceeded and the new on-board monitor will mitigate the risk of a frozen propulsion line by ensuring a transition to normal sun mode in the event that temperatures fall below a safe trigger threshold. A realtime procedure was completed on July 27 to update the on-board Ephemeris. The schedule of targets for next week is shown below and includes an observation of M31 coordinated with HST. |
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NGC 1507 ACIS-S Jul 30 M31 ACIS-I 1RXS J162526.9+455 ACIS-S XMMU J132218.3-164 ACIS-S AX J1733.9-3112 ACIS-I Jul 31 Radiation Belts M17 Pointing I ACIS-I M87 ACIS-S Aug 2 Radiation Belts Kepler's Supernova ACIS-S Aug 3 Radiation Belts Aug 5 NGC 720 ACIS-S Aug 6 M17 Pointing I ACIS-I
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All spacecraft subsystems continued to support nominal operations.
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Revised: July 08, 2022