HUBBLE SPACE TELESCOPE

   DAILY REPORT #2631

PERIOD COVERED:  0000Z (UTC) 05/24/00 - 0000Z (UTC) 05/25/00

Daily Status Report as of 146/0000Z

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 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 PG0026+129 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.

    1.3 Completed STIS/CCD 8437 (Dark Monitor-Part 2 C8)

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

    1.4 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.

    1.5 Completed Two Sets of STIS/CCD 8808 (POMS Test Proposal: STIS 
Non-Scripted Parallel Proposal Continuation III)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
non-scripted, parallel observations as part of a POMS test proposal.  The 
observations completed with no anomalous activity.

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

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of HCLQ1138+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.

    1.7 Completed STIS/CCD 8136 (Powering The Narrow Line Regions In 
Seyfert Galaxies - Are Radio Jets The Key?)

        The Space Telescope Imaging Spectrograph (CCD) was used to see 
whether the energetic importance of Seyfert radio jets has been 
underestimated and whether the jets may provide enough mechanical energy 
input to drive all the line emission in the Narrow Line Region via shocks, 
reducing or eliminating the role played by nuclear photoionising 
radiation.  For the
first time, we have imaged the underlying radio jet in NGC4151, with 
unprecedented angular resolution and here we propose matched resolution, 
spatially resolved, long slit spectroscopy, to search for shock signatures 
due to hot gas along the straight, fine jet.  The observations completed 
nominally.

    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 WF/PC-2 8200 (Globular Cluster Systems in Three Giant 
Coma Ellipticals)

        The WF/PC-2 was used to make observations of the giant Coma 
elliptical galaxy NGC-4889-DI in order to study its globular 
clusters.  What we know about the Coma ellipticals so far present serious 
challenges to virtually every one of the current formation scenarios for 
globular cluster systems.  The observations were executed as scheduled, and 
no anomalies were noted.

    1.10 Completed Two Sets of STIS/MA2 8433 (Angle Corrections for MAMA)

        The Space Telescope Imaging Spectrograph (MA2) was used to run a 
test in order to provide incidence angle corrections for MAMA observations 
using non-concentric slits.  The proposal completed with no reported problems.

    1.11 Completed STIS/MA1/MA2 8426 (Cycle 8 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA1 and 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.

    1.12 Completed WF/PC-2 8301 (A Snapshot Survey of X-ray Selected 
Central Cluster Galaxies)

        The WF/PC-2 was used to make snapshot survey observations of the 
x-ray, central cluster galaxy Z2089.  Central cluster galaxies are the most 
massive stellar systems known and have been used as standard candles for 
many decades.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.13 Completed STIS/CCD/MA1/MA2 8265 (Reverberation Mapping of a 
Narrow-Line Seyfert 1 Galaxy)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to monitor the UV spectral variability of the narrow-line Seyfert 1 
{NLS1} galaxy AKN 564 at 46 epochs in order to measure the size of the 
broad emission-line region via reverberation-mapping techniques.  This 
measurement, and the virial mass estimate that follows from it, will 
provide a key test of NLS1 models and help determine the physical mechanism 
that underlies the principal component of AGN spectra, the Boroson--Green 
primary eigenvector.  These observations will be undertaken in parallel 
with X-ray and ground-based optical observations that will allow us for the 
first time to explore the multiwavelength variability characteristics of 
this important subclass of active galactic nuclei.  The observations 
completed with no reported problems.

    1.14 Completed STIS/CCD/MA1 7345 (Origin and Physical Conditions in the 
Local Lyman-Alpha Forest)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make observations of PGC1116+215 in order to study the origin and physical 
conditions in the local Lyman-Alpha forest.  A wavelength calibration image 
was also taken.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.15 Completed STIS/CCD/MA1 8241 (A Snapshot Survey of Interstellar 
Absorption Lines)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make high resolution Echelle spectrographic observations of the standard 
ultraviolet star HD79186 as part of a snapshot survey of interstellar 
absorption lines.  A wavelength calibration image was also taken.  The 
observations were executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

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

  Scheduled Re-acquisitions: 10
Successful: 10

    2.2 FHST Updates:
Scheduled: 18
Successful: 16

        The full maneuver updates scheduled for 146/051350Z and at 
146/051635Z, both using FHSTs 1 and 2, failed completely.  HSTAR 7613 was 
written.  The subsequent acquisition was successful.

    2.3 Operations Notes:

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

        A NSSC-1 telemetry diagnostic was performed at 145/1335Z per ROP NS-13.

        The NICMOS temperature sensors were disabled at 145/1431Z.

        At 145/1623Z the engineering status buffer upper limit was set to 
six; at 146/0522Z, eight.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW