HUBBLE SPACE TELESCOPE

   DAILY REPORT #2607

PERIOD COVERED:  0000Z (UTC) 04/20/00 - 0000Z (UTC) 04/21/00

Daily Status Report as of 112/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed STIS/CCD 8439 (Bias Monitor-Part 2 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, to build up high-S/N superbiases and track the evolution of hot 
columns.  The proposal completed with no reported problems.

    1.2 Completed Two Sets of WF/PC-2 8449 (Cycle 8 UV Flats Internal Monitor)

        The WF/PC-2 was used to monitor the stability of the UV flat 
field.  The proposal completed with no reported problems.

    1.3 Completed STIS/CCD 8313 (Imaging the Host Galaxies of High Redshift 
Type Ia Supernovae)

         The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of 9781 and its host galaxy.  The propose is to obtain 
snapshot, unfiltered STIS images of distant galaxies of known redshift 
which have hosted supernovae {SNe} of Type IA found via the Supernova 
Cosmology Project.  The observations were completed as scheduled, and no 
anomalies were reported.

    1.4 Completed Two Sets of STIS/CCD 8202 (Bright Quasar Close Lensing 
Search)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of HCLQ2200-3 and HCLQ1349-1 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.

    1.5 Completed Two Sets of STIS/CCD 8437 (Dark Monitor-Part 2 C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the darks.  The proposal completed nominally.

    1.6 Completed WF/PC-2 8146 (A Search for Binary L-Dwarfs)

        The WF/PC-2 was used to search for close binaries amongst the 
sample of 37 low-temperature L dwarfs, identified primarily in the course 
of the DENIS and 2MASS near-infrared surveys.  The observations completed 
with no reported problems.

    1.7 Completed STIS/CCD 8549 (POMS Test Proposal: Non-Scripted Parallel 
Proposal Continuation I)

        The Space Telescope Imaging Spectrograph (CCD) was used to make low 
galactic latitude, non-scripted parallel observations as part of a POMS 
test proposal.  The observations were completed as planned, and no 
anomalies were reported.

    1.8 Completed Two Sets of WF/PC-2 8460 (Cycle 8 Supplemental Darks pt2/3)

        The WF/PC-2 was used to obtain three dark frames every day to 
provide data for monitoring and characterizing the evolution of hot 
pixels.  The observations completed with no reported problems.

    1.9 Completed STIS/CCD/MA1 8179 (The Composition and Evolution of 
Extremely Hot DA White Dwarfs)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make ultraviolet observations of the extremely hot white dwarf star 
PG0948+534 in order to study its composition and evolution.  This star has 
a temperature range from 70,000 to 130,000 degrees K.  A wavelength 
calibration image was also taken.  The observations were completed as 
planned, and no anomalies were reported.

    1.10 Completed Six Sets of WF/PC-2 8805 (POMS Test Proposal: WFII 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used to perform a generic target version of the 
WFPC2 Archival Pure Parallel program.  The program will be used to take 
parallel images of random areas of the sky, following the

    1.11 Completed STIS/MA1/MA2 8144 (UV Spectroscopic Snapshots of FUSE 
AGN Targets)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to make far ultraviolet spectrographic snapshot observations of the 
FUSE AGN target NGC3516.  This object is currently scheduled to be observed 
by the Far Ultraviolet Spectroscopic Explorer {FUSE}.  The observations 
were executed as scheduled, and no anomalies were noted.

    1.12 Completed STIS/MA2 8426 (Cycle 8 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA2) was used to make a 
routine Cycle-8 MAMA dark noise calibration measurement.  This proposal 
will provide the primary means of checking on the health of the MAMA 
detectors.  This is done through frequent monitoring of the background 
count rate.  The observations were completed as planned, and no problems 
were reported.

    1.13 Completed STIS/CCD/MA1 7480 (The Changing Wind Structure of the 
Erupting SMC WN/LBV System HD5980)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make observations of the changing wind structure in the erupting SMC, 
Wolf-Rayet WN/LBV, binary star HD5980.  This is perhaps similar to the 
Great Eruption in Eta Carinae.  The observations were executed as 
scheduled, and no anomalies were noted.

    1.14 Completed WF/PC-2 8059 (POMS Test Proposal: Targeted Parallel 
Archive Proposal)

        The WF/PC-2 was used to observe the parallel opportunities 
available in the neighborhood of bright galaxies are treated in a slightly 
different way from the normal pure parallels.  Local Group galaxies offer 
the opportunity for a closer look at young stellar 
populations.  Narrow-band images in F656N can be used both to identify 
young stars via their emission lines, and to map the gas distribution in 
star-forming regions.  The observations completed nominally.

    1.15 Completed STIS/CCD 8187 (STIS Imaging of the Deep NICMOS Parallel 
Fields: Building on the NICMOS Legacy)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of field #1120 which was previously observed using deep images 
from the NICMOS camera.  The STIS images will yield visual morphologies to 
magnitudes of 24.5 and quantitative measures of image structure to 26.5 or 
fainter in two orbits.  The observations were completed as planned, and no 
problems were reported.

    1.16 Completed Three Sets of WF/PC-2 8445 (WF/PC-2 Cycle 8 Earth Flats)

        The WF/PC-2 was used to make Cycle 8 Earth flat calibration 
observations.  This is to obtain sequences of earth streak flats to 
construct high quality flat fields for the WF/PC-2 filter set.  The 
observations were executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 8
Successful: 8

  Scheduled Re-acquisitions: 9
Successful: 9

    2.2 FHST Updates:
Scheduled: 17
Successful: 17

    2.3 Operations Notes:

        Operations personnel returned to the Building 3 Mission Operations 
Room at 111/1410Z, using CCS string "G".

        Using ROP SR-1A, the SSR EDAC error counter was cleared once.

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

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW