HUBBLE SPACE TELESCOPE

   DAILY REPORT #2589

PERIOD COVERED:  0000Z (UTC) 03/27/00 - 0000Z (UTC) 03/28/00

Daily Status Report as of 088/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Three 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 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.

    1.3 Completed STIS/CCD/MA2 8342 (Abundances in Halo Stars and Galactic 
Element Formation)

        The Space Telescope Imaging Spectrograph (MA1 and CCD) was used to 
make observations of star HD6755 as part of a study of the abundances in 
halo stars and galactic element formation.  The results for the very oldest 
galactic stars will also provide an important, and independent, age 
determination for the Galaxy and hence constrain cosmological age 
estimates.  A wavelength calibration image was also taken.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.4  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.

    1.5 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.

    1.6 Completed STIS/CCD 8246 (The Youngest Massive Star Clusters in the 
SMC as Clues to Star Formation in the Early Universe)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations the young massive star cluster SMC-N88-38 that is located in 
the Small Magellanic Cloud.  These are the youngest massive stars 
accessible to direct observations at ultraviolet and optical 
wavelengths.  A wavelength calibration image was also taken.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.7 Completed Four 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.

    1.8 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.

    1.9 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 A2009.  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.

    1.10 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.

    1.11 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.

    1.12 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.

    1.13 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 #1237 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.

    1.14 Completed WF/PC-2 8459 (Decontaminations and Associated 
Observations Pt. 2/2)

        The WF/PC-2 was used to perform the monthly decons.  Also included 
are instrument monitors tied to decons: photometric stability check, focus 
monitor, pre- and post-decon internals {bias, intflats, kspots, & darks}, 
and UV throughput checks.  The observations were completed nominally.

    1.15 Completed STIS/CCD 8236 (Black Holes and Gas Disks in a Complete 
Sample of Radio-Loud Ellipticals - II: Kinematics)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the radio-loud elliptical galaxy NGC-3801.  From these 
observations we will measure the black hole masses, determine the nature, 
kinematics, and structure of the central gas disks and obtain a modeled 
upper limit to their mass accretion rates.  A wavelength calibration image 
was also taken.  The observations were completed as planned, and no 
problems were reported.

    1.16 Completed STIS/MA1/MA2 8425 (MAMA Full Field Sensitivity Monitor & 
PSF Check)

        The Space Telescope Imaging Spectrograph (MA1 and MA2) was used to 
make observations of globular cluster NGC-6681 as part of a MAMA full field 
sensitivity monitor and point spread function (PSF) check.  The purpose of 
this program is to monitor the sensitivity of the MAMA detectors over the 
full field.  The observations were executed as scheduled, and no anomalies 
were reported.

    1.17 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 MRK463.  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.

    1.18 Completed STIS/CCD/MA2 8280 (Origins, Structure and Evolution of 
Magnetic Activity in the Cool Half of the H-R Diagram: A STIS Survey)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
make observations of star HD48329 to carry out part of a major ultraviolet 
spectral survey of "coronal" late-type stars.  A wavelength calibration 
image was also taken.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.19 Completed 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: 7
Successful: 7

  Scheduled Re-acquisitions: 8
Successful: 8

    2.2 FHST Updates:
Scheduled: 21
Successful: 21

    2.3 Operations Notes:

        As directed by an operations request, the NICMOS FPA temperature 
sensor for detector 1 was enabled at 087/1146Z.

        A TTR was written for a multiple access return link dropout due to 
a forward chain failover while in the coherent mode.  This occurred at 
088/0047Z.

       Per ROP NS-3, the NSSC-1 status buffer was dumped and reset at 
088/0638Z.

        SSR EDAC errors were cleared at 088/1050Z per ROP SR-1A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW