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11 Apr 2003

HUBBLE SPACE TELESCOPE

DAILY REPORT        # 3339

PERIOD COVERED: DOY 100

Part 3 of 3

WFPC2 9710

POMS Test Proposal: WFII backup parallel archive proposal

This is a POMS test proposal designed to simulate scientific plans.

ACS/WFC 9715

Short ACS/WFC Darks and Bias Analysis

The current ACS/WFC bias correction is not optimal. Small residuals
are due to the random offset between the bias level in the active
area and in the overscan region selected as reference. In addition in
science and dark frames the bias level of amplifier B shows a bimodal
distribution which is however not observed in bias frames. The use of
normal bias frames to correct B amp images can result in a bias jump
between amp A and B. Since bias frames are readout with a clocking
pattern slightly different from the dark and science ones we propose
to investigate if short darks {0.5sec} can be used as replacement of
bias frames. 

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated.) None 

COMPLETED OPS REQs: NONE

OPS NOTES EXECUTED: NONE

                       SCHEDULED     SUCCESSFUL    FAILURE TIMES
FGS GSacq                  7              7
FGS REacq                  9              9
FHST Update                19            19
LOSS of LOCK


SIGNIFICANT EVENTS: FOT real-time spacecraft operations continue from
the GSFC MOR, pending study of SIMOR commercial power loss event.
Expect return to SIMOR today on evening shift.  HST-FSB3 Server
remains inoperative.

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