HUBBLE SPACE TELESCOPE

       DAILY REPORT #2544

PERIOD COVERED:  0000Z (UTC) 01/20/00 - 0000Z (UTC) 01/21/00

Daily Status Report as of 021/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Two Sets of STIS/CCD 8408 (STIS CCD Dark Monitor C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to make a 
CCD bias calibration observation.  This is to monitor the darks for the 
STIS CCD.  The observations were executed as scheduled, and no anomalies 
were reported.

    1.2 Completed STIS/CCD 8409 (CCD Bias Monitor C8)

        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 observations completed with no problems.

    1.3 Completed FGS 8527 (Near Term Stability)

        FGS-2R was used to determine the near term stability of the 
instrument.  The goals are twofold: {1} to establish the baseline Long Term 
Stability measurement for the new FGS and monitor changes in the relative 
plate scale and distortion since the SMOV MiniOFAD;  and {2} to monitor 
changes in the transfer function over months.  The proposal completed 
nominally.

    1.4 Completed STIS/CCD/MA1/2 8505 (SM3a Contamination Plan)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to monitor STIS UV/optical sensitivity, using a spectrophotometric 
standard star.  Changes due to contamination or other causes will be 
detected.  The observations completed nominally.

    1.5 Completed STIS/MA2 8509 (NUV MAMA Darks)

        The Space Telescope Imaging Spectrograph (MA2) was used to 
determine the health of the FUV MAMA detector by monitoring the background 
count rate.  The observations completed with no reported problems.

    1.6 Completed STIS/CCD 8202 (Bright Quasar Close Lensing Search)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of HCLQ0353-2 as part of a second generation survey to search 
for bright lensing quasars.  With the restored PSF, new images will be 
considerably more sensitive to the presence of both close separation and 
faint lens components, and because STIS reaches two magnitudes fainter the 
PC, the new snapshot images will have much greater dynamic range.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.7 Completed WF/PC-2 8239 (Imaging the NLR in a Complete Sample of 
z<0.5 Radio-Quiet PG Quasars)

        The WF/PC-2 was used to observe quasar PG0052+251 and to determine 
its role in the evolution of galaxies, where a central engine leaves its 
visible imprints in the galaxy through strong ionization and heating of the 
ISM.  The observations completed with no reported problems.

    1.8 Completed STIS/CCD 8506 (STIS SM3a Corrector and Focus Check)

        The Space Telescope Imaging Spectrograph (CCD) was used to check 
the instrument's focus.  The instrument's focus is checked in two ways: {1} 
taking a series of images with small dithering offsets {to effectively 
improve the spatial resolution, while rejecting cosmic rays and hot 
pixels}, and {2} stepping a star {in sub-pixel steps} across a narrow 
echelle slit {e.g., the 0.1x0.09 slit}, using the CCD.   The observations 
completed with no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

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

  Scheduled Re-acquisitions: 8
Successful: 8

    2.2 FHST Updates:
Scheduled: 18
Successful: 18

    2.3 Operations Notes:

        Servicing Mission Observatory Verification (SMOV) activities continue.

        ROP SSR-1A was used to clear the SSR EDAC error counter on one 
occasion.

        The SSA transmitter was turned on and off three times per ROP IC-2.

        Per an operations request, an SSR-3 engineering performance 
characterization test was conducted at 020/1805Z.  SSR-3 appeared to 
perform nominally, and will be turned off pending the completion of 
analyses.  An SSR interrupt and events status log dump was performed at 
020/1811Z.

        At 020/193711Z, a 486 ESB message 1101 hex was received, indicating 
a SERVO_RUNAWAY problem.  This was probably a single event upset due to the 
vehicle passage through SSA level 1.  HSTAR 7479 was written.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of SMOV and normal science observations and calibrations.

/CAW