HUBBLE SPACE TELESCOPE

       DAILY REPORT #3077

PERIOD COVERED:  0000Z (UTC) 03/20/02 - 0000Z (UTC) 03/21/02

Daily Status Report as of 080/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 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.

    1.2 Completed Four Sets of STIS/CCD 8963 (CCD Bias)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
CCD read noise from multiple bias frames obtained in common science modes: 
amplifier D, gains 1 and 4 electrons/DN, and binning factors of 1x1, 1x2, 
2x1, and 2x2.  The read noise measurements before and after NCC turn-on are 
then compared, and standard calibration reference files for use in pipeline 
reduction of SMOV3B data are constructed.  The proposal had no reported 
problems.

    1.3 Completed STIS/CCD 8964 (CCD Darks)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
dark frames twice daily, as in a corresponding calibration 
program.  Standard calibration reference darks are constructed and hot 
pixel lists are updated for use in pipeline reduction of SMOV3B data.  All 
observations completed without incident.

    1.4 Completed Two Sets of NCS 8967 (Start NICMOS Cooling System)

        The NICMOS Cooling System was configured to re-cool the NICMOS 
detectors, to determine the optimal science operating temperature for the 
NICMOS detectors, and to verify stable operation.  The goals are as 
follows: 1} cool the NICMOS to the coldest possible temperature as 
specified by the NICMOS team {73K} with HST at a hot attitude and the NCC 
compressor operating near its maximum allowable speed. 2} measure NICMOS 
detector performance during the cool-down and steady state operation of the 
NCS. 3} demonstrate stability {+/-0.1K} of the NICMOS detector temperature 
at the optimal science operating temperature and 4} demonstrate 
repeatability {+/-0.1 K} of NICMOS detector temperature following changes 
from the optimal science operating temperature.  All tests were successful.

    1.5 Completed Nine Sets of NICMOS/1/2/3 8945 (Cooling System Monitoring)

        The Near Infrared Camera and Multi-Object Camera (NIC1, NIC2 and 
NIC3 was used 1}.to measure NICMOS detector performance during the 
cool-down and steady state operation of the NCS. 2}. to demonstrate 
stability {+/-0.1K} of the NICMOS detector temperature at the optimal 
science operating temperature. and 3}.to demonstrate repeatability {+/-0.1 
K} of NICMOS detector temperature following changes from the optimal 
science operating temperature.  No problems were encountered.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 0
    Successful: 0

  Scheduled Re-acquisitions: 0
    Successful: 0

    2.2 FHST Updates:
    Scheduled: 0
    Successful: 0

    2.3 Operations Notes:

        Real-time operations returned to the STScI SIMOR at 080/0230Z.

        The NICMOS Cryo Cooler continues to operate nominally.

        Several attitudes reference update slews were performed in order to 
maintain HST attitude.

        The following operations notes were utilized during the day:

                 TPS limit change
                 Limit violations due to increased load
                 ACS limit changes
                 Monitor ACS input voltage

3.0 SIGNIFICANT FORTHCOMING EVENTS:

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

/CAW