HUBBLE SPACE TELESCOPE

   DAILY REPORT #2591

PERIOD COVERED:  0000Z (UTC) 03/29/00 - 0000Z (UTC) 03/30/00

Daily Status Report as of 090/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Two Sets of WF/PC-2 8457 (UV Earth Flats)

        The WF/PC-2 was used to obtain a series of Ultraviolet Earth 
flats.  The observations were completed with no reported problems.

    1.2 Completed Six Sets of WF/PC-2 8090 (POMS Test Proposal: WF-II 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used in the parallel mode to make some low galactic 
latitude archive observations.  The program will be used to take parallel 
images of random areas of the sky.  The observations were executed as 
scheduled, and no anomalies were noted.

    1.3 Completed Three 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.

    1.4 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.

    1.5 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 HD43819 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.

    1.6 Completed STIS/CCD 8217 (Tests of Stellar Models Using Four 
Extremely Massive Spectroscopic Binaries in the R136 Cluster)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
four non-interacting double-lined spectroscopic binaries discovered in the 
R136 cluster by the Cycle 6 FOS spectroscopy.  The proposal completed 
nominally.

    1.7 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.

    1.8 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.

    1.9 Completed WF/PC-2 8163 (Trapezium Systems and Stellar Jets in 
30-Doradus)

        The WF/PC-2 was used to make observations of the 30-Doradus system 
(both the North and South sections).  30-Doradus is the nearest and best 
resolved extragalactic starbursting region.  The observations were 
completed as scheduled, and no anomalies were reported.

    1.10 Completed STIS/CCD 8796 (POMS Test Proposal: STIS Non-Scripted 
Parallel Proposal Continuation IV)

        The Space Telescope Imaging Spectrograph (CCD) was used in the 
parallel mode to make some low galactic latitude archive observations.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.11 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.

    1.12 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 A1914.  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 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.

    1.14 Completed STIS/CCD 8419 (Deep Corongraphic PSF Calibration of STIS)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of standard star HD141653 in order to do a deep corongraphic 
Point Spread Function (PSF) calibration observations. This is to acquire a 
set of deep, coronographic images of isolated, point source stars with STIS 
for the purpose of correcting coronographic science observations for 
residual scattered light from the occulted object.  The observations were 
completed as planned, and no anomalies were reported.

    1.15 Completed STIS/CCD/MA1 8287 (A Search For Transparent Lines of 
Sight With Intergalactic He-II Absorption Towards 26 Bright z > 2.9 Quasars)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make He-II absorption line observations of quasar HS1140+350.  The aim is 
to identify more suitable bright objects for detailed studies of 
intergalactic He-II absorption at a redshift of Z <2.9 and >3.2 .  A 
wavelength calibration observation was also taken.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.16 Completed WF/PC-2 8230 (Snapshot Survey of Dynamically Close 
Galaxy Pairs from z=0.1 to z=0.5)

        The WF/PC-2 was used to make snapshot survey observations of 
galactic cluster Gal-Clus-0.  This is to obtain snapshot images of a large, 
well-defined, and dynamically selected sample of close galaxy pairs at 
moderate redshift.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.17 Completed STIS/CCD/MA1 8273 (The Oxygen Abundance in Translucent 
Interstellar Clouds)

        The Space Telescope Imaging Telescope (CCD and MA1) was used to 
obtain high-resolution STIS echelle observations of the interstellar O I 
Lambda1356 absorption toward a sample of stars behind six translucent 
clouds characterized by large H I column densities and high 
extinctions.  Previous GHRS measurements of this weak feature in diffuse 
clouds have shown no evidence of density-dependent O depletion from the gas 
phase and indicate a total {gas + dust} interstellar O abundance that is 
about 2/3 of the solar value.  The observations were completed nominally.

2.0 FLIGHT OPERATIONS SUMMARY:

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

  Scheduled Re-acquisitions: 10
Successful: 10

    2.2 FHST Updates:
Scheduled: 20
Successful: 19

        As documented in HSTAR 7556, the full maneuver update at 
089/183343Z failed due to large vehicle errors.  The subsequent acquisition 
was successful.

    2.3 Operations Notes:

        The SSR EDAC error counter was cleared once per ROP SR-1A.

        The NICMOS FPA temperature sensor for detector 3 was enabled at 
089/1211Z.

        There were two STIS EMC retries: at 089/1211Z and at 089/2133Z.  In 
each case, the STIS flight software error flags were reset as directed by 
ROP NS-12.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW