HUBBLE SPACE TELESCOPE

       DAILY REPORT #3098

PERIOD COVERED:  0000Z (UTC) 04/18/02 - 0000Z (UTC) 04/19/02

Daily Status Report as of 109/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Five Sets ACS/WFC 9018 (Flat Field Stability)

        The Advanced Camera for Surveys (WFC) was used to assess the 
stability and uniformity of the low-frequency flat fields {L-flat} of the 
WFC detector by using multiple pointing observations of the globular 
clusters 47 Tucanae {NGC104}, thus imaging moderately dense stellar 
fields.  By placing the same star over different portions of the detectors 
and measuring relative changes in its brightness it will be possible to 
determine local variations in the response of the detectors.  There were no 
reported problems.

    1.2 Completed Two Sets of STIS/CCD 8902 (Dark Monitor-Part 2)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the darks.  No problems were reported.

    1.3 Completed Three Sets of WF/PC-2 8937 (Cycle 9 Supplemental Darks pt2/3)

        The WF/PC-2 was used obtain three dark frames every day to provide 
data for monitoring and characterizing the evolution of hot pixels.  No 
problems were encountered.

    1.4 Completed Five Sets of WF/PC-2 8950 (SM3B Cool Down, Contamination 
Monitor, and Focus Check)

        The WF/PC-2 was used to monitor the planned cooldown to -88C, 
followed by UV monitors, focus checks, as well as decons and associated 
monitors.  No problems were noted.

    1.5 Completed STIS/MA2 9573 (NUV-MAMA Daily Dark Monitor)

        The Space Telescope Imaging Spectrograph (MA2) was used to perform 
daily monitoring of the NUV MAMA detector dark noise in order to monitor 
the effects of thermal changes on the NUV dark rate.  No problems occurred.

    1.6 Completed Three Sets of ACS/WFC/HRC 8947 (Weekly Test)

        The Advanced Camera for Surveys (WFC and HRC) was used to perform 
basic tests to monitor, the read noise, the development of hot pixels and 
test for any source of noise in ACS CCD detectors.  This program will be 
executed at least once a day for the entire lifetime of ACS.  There were no 
problems reported.

    1.7 Completed STIS/CCD 8906 (Hot Pixel Annealing)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
the effectiveness of the CCD hot pixel annealing process by measuring the 
dark current behavior before and after annealing and by searching for any 
window contamination effects.  In addition, CTE performance is examined by 
looking for traps in a low signal level flat.  There were no reported problems.

    1.8 Completed STIS/CCD 8904 (Bias Monitor-Part 2)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at 
gain = 4 in order to build up high-S/N superbiases and track the evolution 
of hot columns.  The proposal completed with no anomalous activity.

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The following scheduled proposals did not execute due to the BALL decision 
to delay the ACS high voltage on commanding:

              ACS/SBC 9008 (MAMA Initial Turn-on and Anomalous Recovery 
Procedure)
              ACS/SBC 9009 (MAMA Fold Analysis)

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2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  7
    Successful:  7

  Scheduled Re-acquisitions: 13
    Successful: 13

    2.2 FHST Updates:
    Scheduled:  7
    Successful:  7

    2.3 Operations Notes:

        Using ROP IC-2, SSA transmitter #2 was turned on for the following 
intervals: 108/0906Z to 108/0926Z, 108/0949Z to 108/1013Z, and 108/1452Z to 
108/1503Z.

        The 486 engineering status buffer limit for SESBSLD was modified at 
108/0959Z as directed by ROP DF-18A.

        HSTAR 8616 was written when the AX Link 2 Temperature (EAXLK2T) 
flagged out-of-limits for one telemetry sample at 108/0635Z.  The value was 
9.19844.

        A TTR was written for a required re-transmit at 108/1325Z during a 
NSSC-1 load.  Accordingly, per ROP NS-5, SI C&DH errors were reset at 
108/1332Z.

        An operations request was used at 108/1459Z for tape recorder #2 
management in preparation for battery #3 reconditioning activities.

        The SSR-1 EDAC error counter was cleared at 108/2259Z, using ROP SR-1A.

        -E SPA was unmasked from the TRSWCC stack at 109/0050Z per an 
operations request.

        Battery #3 reconditioning was completed at 109/0101Z.

        The Observer Rate Bias - Estimate 3 (QDVTHJ2) flagged out-of-limits 
at 109/053526Z with a value of 7.101e-5.  The parameter was back in bounds 
at the conclusion of the following ZOE.

        ROP SR-9A was utilized to clear the SSR-3 EDAC error counter at 
109/0355Z.

        The NICMOS instrument was commanded to BOOT, via SMS commanding, at 
109/0708Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of Servicing Mission Orbital Verification and the 
gradual resumption of normal science observations and calibrations.

/CAW