HUBBLE SPACE TELESCOPE

   DAILY REPORT #2629

PERIOD COVERED:  0000Z (UTC) 05/22/00 - 0000Z (UTC) 05/23/00

Daily Status Report as of 144/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 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.

    1.2 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 STIS/CCD 8228 (The Black Hole Versus Bulge Mass 
Relationship in Spiral Galaxies)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the galaxy NGC-4321 in order to study the black hole versus 
bulge mass relationship in spiral galaxies.  A wavelength calibration image 
was also taken.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.4 Completed Five 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.

    1.5 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.

    1.6 Completed WF/PC-2 8124 (The Stellar Initial Mass Function of 
Globular Clusters)

        The WF/PC-2 was used to observe the mass functions of homogeneous 
old stellar populations.  Those for which reliable mass functions have been 
determined already, however, have generally been subject to dynamical 
evolution {relaxation, escape of stars, and tidal shocks}, so that the 
observed mass function is not primordial.  We have therefore examined 
tables of properties of globular clusters in order to choose those that are 
least likely to have suffered from relaxation, escape, and tidal 
shocks.  There were no reported problems.

    1.7 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.

    1.8 Completed 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.

    1.9 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 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 HD71634 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.

    1.11 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 HD223460 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.

    1.12 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.

    1.13 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 STIS/CCD/MA1/MA2 8188 (Snapshot Spectroscopic Diagnostic 
Survey of the Symbiotic Stars)

        The Space Telescope imaging Spectrograph (CCD, MA1 and MA2) was 
used to make ultraviolet observations of star HE2-156 as part of a snapshot 
spectroscopic diagnostic survey of symbiotic stars.  Using these data we 
will be able to establish meaningful statistical limits on the nature of 
hot component sources of ionization and fundamental wind parameters, which 
are vital steps toward understanding the accretion hydrodynamics and the 
evolutionary status of symbiotic systems.  A wavelength calibration image 
was also taken.  The observations were executed as scheduled, and no 
anomalies were noted.

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

        The Space Telescope Imaging Spectrograph (MA1) 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.

    1.16 Completed STIS/MA1 8316 (The Lyman-Alpha Absorption Cross-Section 
of Nearby Galaxies)

        The Space Telescope Imaging Spectrograph (MA1) was used to study 
the Lyman-Alpha absorption cross-section of nearby galaxy PG1149-110.  The 
high resolution of the spectra will allow us to accurately determine the 
velocity of the gas, which can be compared to the systemic velocity of the 
galaxy, and to the velocity field determined from 21 cm H-I emission 
measurements, when available.  This will enable us to determine if or how 
the gas is kinematically tied to the galaxy.  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: 10
Successful: 10

  Scheduled Re-acquisitions:  7
Successful:  7

    2.2 FHST Updates:
Scheduled: 25
Successful: 25

    2.3 Operations Notes:

        Real-time operations transferred to the CCS "C" string at 
143/1259Z, and returned to the "B" string at 143/1618Z.  The "B" string was 
re-cycled at 143/2250Z due to a SAC server problem (HSTAR 7608) and 
remained unavailable until 143/2325Z.  During this down time the CCS "A" 
string was used as the back-up system.

        Using ROP DF-18A, the engineering status buffer was set to a high 
limit of 2 at 143/1643Z, and to a high limit of 3 at 144/0636Z.

       The NICMOS FPA temperature sensor for detector 2 was enabled at 
144/0459Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW