The Hubble Space Telescope
Unlocking the Secrets of the Universe
Daily Report #5773
Period Covered:
08:00 pm May 3, 2012 - 07:59 pm May 4, 2012
(DOY 125/0000z - 125/2359z)
Flight Operations Summary
This report was generated by the HST Automated Report System @2012-05-05 17:02:00 GMT
Significant Spacecraft Anomalies: (The following are preliminary reports
of potential non-nominal performance that will be investigated.)
HSTARs:
none
COMPLETED OPS REQUEST:
none
COMPLETED OPS NOTES:
none
FGS ACQ STATUS:
SCHEDULED SUCCESSFUL
FGS GSAcq 7 7
FGS REAcq 8 8
OBAD with Maneuver 3 3
SIGNIFICANT EVENTS:
Flash Report: COS Suspend: HSTAR 13305 An Anomaly Status Briefing was held on Friday, May 04,
2012 to discuss the current status of the investigation into the COS suspend event that took place
on day 121. Attendees included, in addition to the STScI and GSFC teams, members of the University
of Colorado COS Instrument Science Team and Principal Investigator, and the UC Berkeley team that
built the COS FUV detector and many similar detectors on-orbit. The following information
summarizes the anomaly briefing. 1. Updates to Presentation: Two chart packages were used
for this meeting.
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S_Suspend_2012.04.30/COS%20Status%20Review05_4_12/COS%20Suspend_May_04_12_Status_Briefingrev1.pptx>
package contains all the presentations but is currently missing an animation of the event that was
provided in
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maly_Info/COS_Suspend_2012.04.30/COS%20Status%20Review05_4_12/120504_COS_Status_Review_togsfc.pptx>
set of charts that contains the STScI input. Note that the animation in the second presentation may
not operate properly on a Windows machine. The file is also about 50MB in size. A file containing
only the animation can be found
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It should run properly on a Windows machine. The first presentation will be updated to reflect
the order that the charts were presented. 2. Action Items: Action 1 - Investigate history
to determine why the flight code was changed between STIS and ACS in the handling of error
conditions of this type. Assigned: Payload Flight Software Status: Open 3. Waiver
Approvals: N/A 4. Discussion/Agreements: The meeting was convened with the primary purpose
of presenting the latest analysis results and to obtain approval to proceed next week to command
the COS to operate and to begin recovery of the NUV. The MOSES II SI system engineers, STScI
instrument engineers, and the COS team presented the results of their analysis and were of the
unanimous opinion that it was safe to proceed with the plan to bring the NUV up in a controlled
manner. Mike Kelly of the SI Flight Software team presented the results of the investigation into
the software behavior during the event. It was determined that the DIB responded properly to the
error condition generated by the high count rate event. This was verified in a test in the VSTIF
using the COS bench. He recommended that an SCR be written to correct the logic which resulted in
the 803 error. An investigation into the history of this code is required to determine why it was
changed between STIS and ACS (and was carried forward to COS) before this change can be made. Tom
Wheeler and Merle Reinhart of the STScI presented the plan for recovering the NUV. The commanding
will be executed from stored commanding over a four day period beginning Monday morning local time.
A real-time command to clear an event flag will be required before each segment to allow the test
to proceed. The Project granted approval to proceed with this plan. 5. Liens: None,
investigation is still underway.
Program |
Principal Investigator |
Program Title |
Science Observations Scheduled |
12473 |
David Sing, University of Exeter |
An Optical Transmission Spectral Survey of hot-Jupiter Exoplanetary Atmospheres |
12549 |
Thomas Brown, Space Telescope Science Institute |
The Formation History of the Ultra-Faint Dwarf Galaxies |
Calibration Observations Scheduled |
12351 |
Knox Long, Space Telescope Science Institute |
IR Persistence 18 |
12688 |
Tiffany Borders, Space Telescope Science Institute |
Cycle 17: UVIS Bowtie Monitor |
12689 |
Tiffany Borders, Space Telescope Science Institute |
WFC3 UVIS CCD Daily Monitor |
12698 |
Sylvia Baggett, Space Telescope Science Institute |
UVIS Cycle 19 Contamination and Photometric Stability Monitor |
12742 |
Justin Ely, Space Telescope Science Institute |
CCD Dark Monitor Part 2 |
12744 |
Justin Ely, Space Telescope Science Institute |
CCD Bias and Read Noise Monitor-Part 2 |
12782 |
David Golimowski, Space Telescope Science Institute |
CCD Daily Monitor {Part 2} |