HUBBLE SPACE TELESCOPE

   DAILY REPORT #2632

PERIOD COVERED:  0000Z (UTC) 05/25/00 - 0000Z (UTC) 05/26/00

Daily Status Report as of 147/0000Z

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 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 WF/PC-2 8290 (Weather, Moons, and Orbit of the Brown 
Dwarf Gl 229B)

        The WF/PC-2 was used to make observations of the brown dwarf star 
HD42581 (a.k.a., GI 229B).  Gl 229B is the only unambiguous brown 
dwarf.  It can be imaged with high astrometric and photometric accuracy 
only by HST.  The observations were executed as scheduled, and no anomalies 
were noted.

    1.4 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.

    1.5 Completed Four 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 Two Sets of 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.

    1.7 Completed WF/PC-2 8609 (Host Galaxy Luminosities of the Most 
Luminous QSOs)

        The WF/PC-2 was used to determine the factors that decide whether a 
galaxy is host to a luminous QSO.  Recent evidence indicates that host 
galaxy spheroid mass is a key factor: we want to test the relationship 
between host galaxy and QSO luminosity at the highest feasible QSO 
luminosities by measuring the luminosities and profiles of host galaxies 
for QSOs with -25.8 > M_V > -27.6.  Current data in this area are 
conflicting.  The observations completed with no reported anomalies.

    1.8 Completed WF/PC-2 8444 (WF/PC-2 CYCLE-8 Internal Monitor)

        The WF/PC-2 was used to make a bias, and an internal flat, 
observation as part of a Cycle-8 monitoring program to monitor the health 
of the cameras.  A variety of internal exposures are obtained in order to 
provide a monitor of the integrity of the CCD camera electronics in both 
bays {gain 7 and gain 15}, a test for quantum efficiency in the CCDs, and a 
monitor for possible buildup of contaminants on the CCD windows.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.9 Completed WF/PC-2 8118 (Snapshot Survey of Galactic Globular Clusters0

        The WF/PC-2 was used to make observations of crowded centers of 
globular clusters {GCs} which have produced intriguing discoveries of new 
phenomena, most of which are not understood theoretically. This is a 
continuation of a Cycle 7 snapshot proposal, to extend such work to a much 
larger portion of the Galactic GC system.  The observations completed 
nominally, with no reported problems.

    1.10 Completed WF/PC-2 8181 (Resolving Sirius-like Binaries)

        The WF/PC-2 was used to make observations of the star MS0354.6-3 in 
order to try and resolve these Sirius-like binary star systems.  Subsequent 
determinations of the visual orbits of the resolved binaries with the HST 
will provide dynamical measurements of the white-dwarf masses.  The 
observations were completed as scheduled, and no anomalies were reported.

    1.11 Completed STIS/MA2 8275 (Ultraviolet Snapshots of 3CR Radio Source 
Counterparts at Low Z)

        The Space Telescope Imaging Spectrograph (MA2) was used to make 
ultraviolet snapshot observations of the radio galaxy 3C465.0.  Radio 
galaxies are an important class of extragalactic objects, representing one 
of the most energetic astrophysical phenomena, while extraordinarily useful 
as probes of their environments and of the early Universe.  The 
observations were completed as scheduled, and no anomalies were reported.

    1.12 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.

    1.13 Completed STIS/CCD/MA1 8139 (Probing an Ancient Thermonuclear 
Runaway on a White Dwarf in a Dwarf Nova)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
probe the ancient thermonuclear runaway on a white dwarf.  Evidence was 
unexpectedly discovered, based upon two GHRS G160M spectra, of greatly 
elevated abundances of odd-numbered nuclei Phosphorus and Aluminum, as well 
as a Nitrogen-to-Carbon ratio of 10 in the photosphere of the white dwarf 
in the dwarf nova VW Hyons.  This proposal intends to {1} determine the 
first chemical abundances of many odd-numbered proton capture species; {2} 
determine a accurate mass for the white dwarf and; {3} probe changes in the 
accretion belt and surface abundances as a function of time since a 
superoutburst.  The proposal completed nominally.

    1.14 Completed Three 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.

    1.15 Completed STIS/CCD/MA1/MA2 8198 (Understanding the Starburst-like 
Dust in the Small Magellanic Cloud)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to investigatethe similarities between the ultraviolet extinction 
found in the star forming bar of the Small Magellanic Cloud {SMC} and 
starburst galaxies has highlighted the importance of understanding the dust 
extinction in the SMC.  The proposal completed with no reported problems.

    1.16 Completed STIS/CCD 8227 (The Shock Cones and Underlying Stars in 
Interacting Wolf-Rayet Binaries)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the interacting Wolf-Rayet binary star WR147.  This system 
is a strong radio emitter of non-thermal radiation.  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: 8
Successful: 8

  Scheduled Re-acquisitions: 7
Successful: 7

    2.2 FHST Updates:
Scheduled: 18
Successful: 18

    2.3 Operations Notes:

        ROP DF-18A was used to set the engineering status buffer high limit 
to 9 at 146/1449Z.  The same ROP was used at 147/0526Z to set the high 
limit to 10.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW