HUBBLE SPACE TELESCOPE

   DAILY REPORT #2599

PERIOD COVERED:  0000Z (UTC) 04/10/00 - 0000Z (UTC) 04/11/00

Daily Status Report as of 102/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 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.

    1.2 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.

    1.3 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.

    1.4 Completed Seven 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 WF/PC-2 8216 (T Tauri Star Snapshot Survey II. Completing 
the CTTs Sample)

        The WF/PC-2 was used to make observations of the T-Tauri class star 
known as LKHA-101 as part of Snapshot Survey II.  This database will be of 
fundamental importance to understanding the nature of planet-forming 
environments and their frequency in the galaxy.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.6 Completed 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.

    1.7 Completed STIS/CCD 8286 (Absolute Proper Motions of Nearby Dwarf 
Spheroidal Galaxies)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the absolute proper motions of the nearby dwarf spheroidal 
galaxy CAR-QSO-06.  HST is essential to achieving the high precision needed 
to conclusively compare the projected orbital motions of the individual 
galaxies.  Even with our conservative uncertainties, we are competitive 
with the best ground-based efforts with only a two year baseline.  The 
observations were completed as scheduled, and no anomalies were reported.

    1.8 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.

    1.9 Completed Three 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.

    1.10 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.

    1.11 Completed STIS/CCD 8176 (Confirmation and Characterization of 
Brown Dwarfs and Giant Planets from NICMOS 7226/7227)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
confirmation and characterization observations of object TWA6B.  This is a 
continuation of NICMOS 7226/7227 using the STIS.  A systematic search for 
giant planet and brown dwarf companions to stars in the solar neighborhood 
was the cornerstone of the NICMOS IDT's Environments of Nearby Stars {EONS} 
program.  The observations were completed as planned, and no anomalies were 
reported.

    1.12 Completed 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.

    1.13 Completed Two Sets of WF/PC-2 8203 (Dwarf Busting in Abell 868)

        The WF/PC-2 was used to to identify and characterize the 
morphological nature of the dwarf galaxy population{s} responsible for the 
steep upturn seen in Abel 868's luminosity function.  While similar upturns 
have been reported in many clusters, the specifics of the dwarf population 
remain unknown as these objects cannot be resolved from the ground.  What 
type of dwarf galaxies are they ?  Is there more than one population 
contributing ?  How are they clustered ?  These observations are intended 
to answer these questions.  The observations were completed, and no 
problems were reported.

    1.14 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.

    1.15 Completed STIS/CCD 8412 (STIS CCD Imaging Flats C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to 
investigate the flat-field stability of the unit over a monthly period.  A 
bias calibration observation was also taken.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.16 Completed STIS/CCD 8411 (STIS CCD Spectroscopic Flats C-8)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
CCD flats in the spectroscopic mode.  The observations were completed as 
scheduled, and no anomalies were reported.

    1.17 Completed STIS/CCD/MA2 8294 (Is SiO Observed in the UV Spectrum of 
Beta Gem?)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
observe Beta Gem {HD 62509} which is a K0 III star with relatively low 
ultraviolet {UV} emission line fluxes and X-ray emission, and is thought to 
be a helium core- burning `clump' giant.  The proposal completed nominally, 
with no reported problems.
    1.18 Completed WF/PC-2 8223 (The Nature of RadioOptical Alignments in 
Faint Radio Sources)

        The WF/PC-2 was used to make observations of the faint radio galaxy 
STAR-1812+6 in order to study the nature of its radio/optical 
alignment.  The study of the host galaxies of high redshift AGN is 
important if we are to attempt to investigate the population of high 
redshift galaxies, which are not selected on the basis of luminous 
starburst activity.  The observations were completed as planned, and no 
problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

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

  Scheduled Re-acquisitions: 8
Successful: 8

    2.2 FHST Updates:
Scheduled: 20
Successful: 20

    2.3 Operations Notes:

        Per ROP DF-18A, the 486 ESB was dumped and cleared at 101/1137Z.

        HSTAR 7573 was written when the FGS aberration parallax 12 mnemonic 
was out-of-limits, beginning at 101/1220Z.

        The SSR playback pointer was set at 101/2130Z in order to recover 
the data from a STIS proposal.  ROP SR-3 was used.

        The ephemeris load was uplinked at 102/0003Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW