HUBBLE SPACE TELESCOPE

   DAILY REPORT #2609

PERIOD COVERED:  0000Z (UTC) 04/24/00 - 0000Z (UTC) 04/25/00

Daily Status Report as of 116/0000Z

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 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.

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

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of HCLQ0446-4 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.

    1.4 Completed Two Sets of 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.

    1.5 Completed Two Sets of WF/PC-2 8442 (Cycle 8 Standard Darks)

        The WF/PC-2 was used to obtain dark calibration 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 
anomalies.

    1.6 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.

    1.7 Completed STIS/CCD 8189 (The Source of Gamma Ray Bursts and the 
Nature of their Hosts)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
high resolution optical and ultraviolet observations of the Gamma Ray 
Burster (GRB) 990712 and its host galaxy.  This comprehensive set of 
observations will provide new insights into the astrophysics of GRBs and 
their high redshift host galaxies.  The observations were completed as 
planned, and no problems were reported.

    1.8 Completed Two 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 recommendations 
of the Parallels Working.  The proposal completed with no reported problems.

    1.9 Completed STIS/CCD/MA2 8243 (SINS: The Supernova Intensive Study - 
Cycle 8)

        The Space Telescope Imaging spectrograph (CCD and MA2) was used to 
make observations of supernova SN1998J.  Supernovae reveal the last stages 
of stellar evolution, create the chemical history of the Universe, energize 
the interstellar gas, and occupy the center of attention for the 
extragalactic distance scale and cosmology.  A wavelength calibration image 
was also taken.  The observations were completed as planned, and no 
problems were reported.

    1.10 Completed Two Sets of STIS/CCD 8797 (Spectroscopic Flats C8 - Late 
Continuation)

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
Cycle 8 STIS CCD flat program in order to provide monitoring information to 
S/N levels up to about 600 which should be sufficient for the vast majority 
of science observations.  The observation completed nominally.

    1.11 Completed STIS/CCD 8340 (Probing the Kinematics of the Narrow-Line 
Region in Seyfert Galaxies with Slitless Spectroscopy)

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
studies of the gas kinematics of the narrow-line regions in Seyfert 
galaxies.  Previous studies indicate complex velocity fields, with evidence 
for both gravitational and non-gravitational forces.  The proposal 
completed nominally.

    1.12 Completed FGS 8319 (Masses and Distances of Pre-Main Sequence 
Binaries)

        The Fine Guidance Sensors were used to make astrometric 
observations of the pre-main sequence binary star system 
V853-Oph.  Observations were also made of several reference stars.  Our 
goal is to measure the masses of low mass young stars.  This will enable a 
calibration of theoretical calculations of stellar evolution to the main 
sequence.  The observations were completed as planned and no problems were 
reported.

    1.13 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.

    1.14 Completed STIS/CCD 8474 (Coronographic Imaging of Protoplanetary 
Disks)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
broad-band optical coronographic imaging that will be used to search for 
circumstellar disks and indirect signatures of the presence of massive 
planets toward the nearby Herbig Ae/Be and T Tauri stars.  The observations 
completed with no reported problems.

    1.15 Completed STIS/CCD 8228 (The Black Hole Versus Bulge Mass 
Relationship in Spiral Galaxies)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the galaxy NGC-4030 in order to study the black hole versus 
bulge mass relationship in spiral galaxies.  A wavelength calibration image 
was also taken.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.16 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.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 9
Successful: 9

  Scheduled Re-acquisitions: 7
Successful: 7

    2.2 FHST Updates:
Scheduled: 21
Successful: 21

    2.3 Operations Notes:

        Using ROP IC-2, the SSA-2R transmitter was turned on and off for 
three intervals.

        Real-time operations was transferred to the CCS "B" string at 
115/1820Z for a CCS Release 3.2 command test.  After the successful 
completion of that test, operations returned to the "A" string at 115/1832Z.

        ROP NS-5 was used at 115/2034Z to reset an SI C&DH error.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW