The Hubble Space Telescope

Unlocking the Secrets of the Universe

Daily Report #5619

Period Covered:
07:00 pm December 1, 2011 - 06:59 pm December 2, 2011
(DOY 336/0000z - 336/2359z)

Flight Operations Summary

This report was generated by the HST Automated Report System @2011-12-03 17:02:00 GMT

Significant Spacecraft Anomalies: (The following are preliminary reports
of potential non-nominal performance that will be investigated.)

HSTARs:
13127 - SSR-3 Playback Unexpectedly Stopped@335/1714z

COMPLETED OPS REQUEST:
none

COMPLETED OPS NOTES:
none

FGS ACQ STATUS:
SCHEDULED SUCCESSFUL
FGS GSAcq 7 7
FGS REAcq 4 4
OBAD with Maneuver 8 8

SIGNIFICANT EVENTS:
At 335/17:36:34 last night, SSR-3 locked up during a Science data playback (HSTAR 13127). The event
occurred in an SAA and appears the same as HSTAR 13012 on SSR-1 from day 256. COP 7.77 was started
to confirm and clear the suspected Reed Solomon bus error. The error status reflected a different
value than expected so the commanding was not performed to clear the error.

At 22:13 UTC, Pacor successfully processed SSR-3 dump data that was collected via Ops Request #
19175 - Reset Bit 14 of SSR-3. HST's nominal DMS configuration was restored at 22:20 UTC,
allowing science data to be recorded to both SSRs. The FOT will resume nominal Flight Plan
execution through the ACE. A User Generated Key Monitor (UGKM) has been deployed to autonomously
detect future lockups on either SSR. Many thanks to the FOT for their excellent support in
response to this anomaly! Mark Slater HST Systems Management Engineer
mslater@hst.nasa.gov (240) 684-1413



Program Principal Investigator Program Title
Science Observations Scheduled
12099 Adam Riess, The Johns Hopkins University Supernova Follow-up for MCT
12177 Pieter van Dokkum, Yale University 3D-HST: A Spectroscopic Galaxy Evolution Treasury
12247 Nial Tanvir, University of Leicester Identifying and studying gamma-ray bursts at very high redshifts
12257 Leo Girardi, Osservatorio Astronomico di Padova The Nature of Multiple Main Sequence Turn-offs and Dual Red Clumps in Magellanic Cloud Star Clusters
12378 Andrew Levan, The University of Warwick The differing environments of dark gamma-ray bursts
12581 Julia Roman-Duval, Space Telescope Science Institute A Direct CO/H2 Abundance Measurement in Diffuse and Translucent LMC and SMC Molecular Clouds
Calibration Observations Scheduled
12689 Tiffany Borders, Space Telescope Science Institute WFC3 UVIS CCD Daily Monitor
12727 Edmund Nelan, Space Telescope Science Institute Long Term Stability of FGS1r in Position Mode {LTSTAB}
12729 David Golimowski, Space Telescope Science Institute CCD Daily Monitor {Part 1}
12734 Norman Grogin, Space Telescope Science Institute ACS CCD Stability Monitor
12741 Justin Ely, Space Telescope Science Institute CCD Dark Monitor Part 1
12743 Justin Ely, Space Telescope Science Institute CCD Bias and Read Noise Monitor Part 1
12767 Elena Mason, Space Telescope Science Institute - ESA STIS CCD Imaging Flat-field Monitor
12769 Michael Wolfe, Space Telescope Science Institute CCD Sparse Field CTE Internal
12771 Chris Long, Space Telescope Science Institute Slit Wheel Repeatability
12776 Colin Cox, Space Telescope Science Institute MAMA Dark Monito