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Friday 10 July 2009 9.00am EDT
| On July 7 the OBC grating "move failed" flag was unexpectedly set
following a nominal retraction of the HETG. Initial engineering
assessment indicates that the cause was a change in state of the HETG
retract limit switch that has been unused since Aug 2000 following
anomalous behavior. Since then, grating operations have been conducted
using a software patch to avoid using the anomalous switch. Given the
new behavior a flight software K-constant patch will be developed to
ignore all states of the switch.
Following the anomaly, loads were planned to remove the remaining grating observations for the week. Observations of 4U1724-307, Mkn 421 and SN1987A will be replanned in a later load. There was no impact to science due to the anomaly. A real-time procedure was completed on Jul 7 to update the on-board ephemeris. Of note this week is the Supernova Remnants and Pulsar Wind Nebulae in the Chandra Era science workshop being held in Boston. The schedule of targets for the next week is shown below. |
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PSRJ1622-49 ACIS-I Jul 10 NGC 6342 ACIS-S Abel l2276 ACIS-I 4C73.08 ACIS-I Jul 11 Radiation Belts SGR0418+5729 HRC-I Jul 12 MKN 6 ACIS-S NGC 4051 ACIS-S Jul 13 SDSSJ1644+4157 ACIS-S HD201601 ACIS-I G1.9+0.3 ACIS-S Radiation Belts Jul 14 1RXSJ212700.3+101108 ACIS-S XTEJ1701-462 ACIS-S Terzan 5 ACIS-S Jul 15 F02021-2103 ACIS-S Jul 16 NGC 70 ACIS-I Mrk 209 ACIS-S AXJ154905-5420 ACIS-S Radiation Belts Jul 17 Vela PWN ACIS-S N49 ACIS-S Jul 18 G1.9+0.3 ACIS-S IGRJ11321-5311 ACIS-I PNDS1 ACIS-S Jul 19 NGC2305 ACIS-S
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All spacecraft subsystems continued to support nominal operations.
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Revised: July 08, 2022