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HUBBLE SPACE TELESCOPE

DAILY REPORT #2617

PERIOD COVERED: 0000Z (UTC) 05/04/00 - 0000Z (UTC) 05/05/00

Daily Status Report as of 126/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed 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 Two Sets of STIS/CCD/MA1 8149 (The Spectral Energy
Distribution of a Neutron Star Photosphere)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make direct measurement of the radius or mass of any neutron star outside a
binary system. The proposal seeks to obtain the spectral energy
distribution of the isolated neutron star, RX J185635-3754. The
observations completed with no reported problems.

1.3 Completed Two 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.

1.4 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.

1.5 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.

1.6 Completed STIS/CCD/MA1 8188 (Snapshot Spectroscopic Diagnostic
Survey of the Symbiotic Stars)

The Space Telescope imaging Spectrograph (CCD and MA1) was used to
make ultraviolet observations of star UKS-CE1 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.

1.7Completed WF/PC-2 8337 (Red Giants, Planetary Nebulae, and the
Properties of Virgo's Intracluster Stars)

The WF/PC-2 was used to observe the intracluster starlight that can
be a powerful probe of the structure and evolutionary state of galaxy
clusters. Recently, this field of study has been revolutionized by the
ground-based discovery of intracluster planetary nebulae {IPN} in the Virgo
and Fornax Clusters, and by the detection of Virgo's intracluster red
giants {IRG}. This proposal will detect IRG stars in regions of the Virgo
cluster where the stellar density is high and the IPN luminosity function
is well defined, allowing the proposer to calibrate IPN measurements in the
rest of the cluster, independently confirm the Virgo Cluster morphology,
and place new constraints on the parent populations of the intracluster
stars. The proposal completed nominally.

1.8 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.

1.9 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 NGC5247 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.

1.10 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.

1.11 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.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions: 6
Successful: 6

Scheduled Re-acquisitions: 13
Successful: 13

2.2 FHST Updates:

Scheduled: 12
Successful: 12

2.3 Operations Notes:



3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/CAW