HUBBLE SPACE TELESCOPE

       DAILY REPORT #3085

PERIOD COVERED:  0000Z (UTC) 04/01/02 - 0000Z (UTC) 04/02/02

Daily Status Report as of 092/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Four 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.

    1.2 Completed Four 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.

    1.3 Completed Two 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.

    1.4 Completed Three Sets of ACS/WFC/HRC 8992 (ACS Early Release 
Observations)

        The Advanced Camera for Surveys (WFC and HRC) was used to perform 
early release observations {ERO}, employing a variety of instruments to 
demonstrate the new capabilities.  The observations (not all in this 
iteration) will include: 1} WFC observations of peculiar galaxies NGC 4676 
{The Mice} and UGC 10214.  This will be used to study young stellar 
clusters formed through the process of galaxy interaction.  Any dark 
companion to UGC 10214 will also be searched for in sensitive ACS/WFC 
observations. 2} Emission line and continuum imaging of the Cone Nebula and 
M 17 with WFC to demonstrate the improved sensitivity and angular 
resolution of ACS. 3} Coronagraphic imaging of HD 141569, a main sequence 
star with circumstellar disk. 4} Coronagraphic imaging with the HRC of the 
nearby quasar 3C 273 to investigate the physical properties of the host 
galaxy and environments.  There were no reported problems.

    1.5 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.

    1.6 Completed STIS/CCD 8913 (Slit Wheel Repeatability)

        The Space Telescope Imaging Spectrograph (CCD) was used to test the 
repeatibility of the slit wheel by taking a sequence of comparison lamp 
spectra with grating G230MB {2697} and the three smallest long slits 
{52X0.2, 52X0.1, and 52X0.05}.  All spectra completed nominally.

    1.7 Completed Five Sets of WF/PC-2 8935 (Cycle 10 Standard Darks)

        The WF/PC-2 was used to obtain dark frames every week in order to 
provide data for the ongoing calibration of the CCD dark current rate, and 
to monitor and characterize the evolution of hot pixels.  Over an extended 
period these data will also provide a monitor of radiation damage to the 
CCDs.  The proposal completed with no reported problems.

    1.8 Completed Two 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.

    1.9 Completed Two Sets of 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.

    1.10 Completed WF/PC-2 8939 (Cycle 10 Internal Monitor)

        The WF/PC-2 was used to calibrate the internal monitor, to be run 
weekly to monitor the health of the cameras.  No problems were encountered.

    1.11 Completed Three Sets of WF/PC-2 8942 (Cycle 10 Intflat Sweeps and 
Linearity Test)

        The WF/PC-2 was used to monitor the pixel-to-pixel flatfield 
response and provide a linearity check.  These intflat sequences are done 
once during the year and the images will provide a backup database in the 
event of complete failure of the visflat lamp as well as allow monitoring 
of the gain ratios.  There were no reported problems.

    1.12 Completed Ten Sets of WF/PC-2 8952 (SM3B Flat Field Calibration)

        The WF/PC-2 was used to check for changes in flat field using 
external earth flat fields.  No problems were encountered.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  4
    Successful:  4

  Scheduled Re-acquisitions:  7
    Successful:  7

    2.2 FHST Updates:
    Scheduled: 11
    Successful: 11

    2.3 Operations Notes:

        The NICMOS Cryo Cooler cool down continues nominally.

        During the day, the following operations requests were performed:
Reset PSEA AD Configuration @091/1543z
Allow STIS MAMA2 LV Turn On @091/1928z
Reset NCS Min/Max Buffer @091/1929z
Temporarily lower DT116,117 Compare2 val @092/0505z
Temporarily lower 8051 FSW end of surge @092/0504z

        The following operations notes were executed during this 
operational day:
WFPCII Decom @089/0435z - 089/1414z
Lim Chg JERRCNT @088/1752z
Turn On ACS HRC/SBC Corrector Status limit @088/1755z
PCS Gyro 2 Limit Change



        The NSSC-1 status buffer was dumped and reset at 091/1604Z per ROP 
NS-3.

        Per HSTAR 8590, the solid state recorder temperature (DS1T2) broke 
its limit at 091/1605Z for one telemetry sample after showing s steady 
upward trend for the previous 12 hours.

        Using ROP NS-5, SI C&DH errors were reset at 091/1605Z.

        ROP DF-07A was used to uplink the ephemeris table at 092/0037Z.

        As directed by ROP IC-2, SSA transmitter #2 was turned on for the 
intervals 092/0455Z to 092/0509Z and 092/0601Z to 092/0647Z.

        The 486 engineering status buffer limits were adjusted at 
092/0629Z, using ROP DF-18A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

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

/CAW