HUBBLE SPACE TELESCOPE - Continuing to collect World Class
Science
DAILY REPORT #4853
PERIOD COVERED: 5am May 26 - 5am May 27, 2009 (DOY 146/0900z-147/0900z)
OBSERVATIONS SCHEDULED
ACS 11368
ACS CCD Temperature Set Point Determination
Purpose: Adjust the CCD temperature to nominal operating level.
COS 11354
COS Science Data Buffer Check/Self-Tests for CS Buffer RAM and DIB RAM
The COS Science Buffer RAM is checked for bit flips during SAA passages.
This is followed by a Control Section (CS) self-test consisting of
writing/reading a specified bit pattern from each memory location in
Buffer RAM and a similar test for DIB RAM. The DIB must be placed in
BOOT mode for its self-test. The CS Buffer RAM self-test as well as the
bit flip tests are all done with the CS in Operate. Supports Activity
COS-03
WFC3 11358
WFC3 Science Data Buffer Check/Self-Tests for CS Buffer RAM
The WFC3 Science Buffer RAM is checked for bit flips during SAA
passages. This is followed by a Control Section (CS) self-test
consisting of writing/reading a specified bit pattern from each memory
location in Buffer RAM. The CS Buffer RAM self-test as well as the bit
flip tests are all done with the CS in OPERATE.
FLIGHT OPERATIONS SUMMARY:
Significant Spacecraft Anomalies: (The following are preliminary reports
of potential non-nominal performance that will be investigated.)
HSTARS: (None)
COMPLETED OPS REQUEST:
18447-0 - Set ACS Event Flag 10 so ACS does not Safe @ 146/14:30z
18453-0 - Restore normal ACS SDH tasking orders @ 146/14:35z
18454-0 - PN format for Gyro Data Collect @ 147/02:00z
COMPLETED OPS NOTES: (None)
SCHEDULED
SUCCESSFUL
FGS GSAcq
5
5
FGS REAcq
0
0
OBAD with Maneuver 6
6
SIGNIFICANT EVENTS:
Flash Reports:
-The ACS WFC TEC was enabled at 146/13:00 and successfully cooled the
WFC detector to its default operational temperature of -81dgC this
morning. It took ~50 minutes for the TEC to reach a stable control
current draw of ~2.0amps and its initial operations show no anomalous
behavior. Event Flag 10 was then set via Ops Request 18447 (so stored
commanding will skip ACS safing activation at 147/04:24). The next
activity for ACS is stored command recovery from Hold to WFHROper with
the WFC TEC enabled. The HRC TEC and HRC Backpowering will remain
disabled (commanding blocked by Event Flags 7 and 9).
-The FSW team completed their analysis of the last 3 zero-filled patterns
loaded to and dumped from the COS CS Buffer memory, no bit flips in CS
Buffer memory was observed. This concludes the
anomalous behavior was observed.