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HUBBLE SPACE TELESCOPE

DAILY REPORT #2741

PERIOD COVERED: 0000Z (UTC) 11/01/00 - 0000Z (UTC) 11/02/00

Daily Status Report as of 307/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Three Sets of WF/PC-2 8826 (Cycle 9 Supplemental Darks pt 1)

The WF/PC-2 was used to perform a T dark calibration program that
obtains three dark frames every day in order to provide data for monitoring
and characterizing the evolution of hot pixels. There were no reported
anomalies.

1.2 Completed Two Sets of STIS/CCD 8837 (CCD Dark Monitor-Part 1)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks. The proposal completed with no reported problems.

1.3 Completed Three Sets of STIS/CCD 8631 (Bright Quasar Close Lensing
Search II)

The Space Telescope Imaging Spectrograph (CCD) was used to expand
the Cycle 8 second generation HST snapshot survey of bright quasars,
optimized to find lenses with component image separations < 1". The
observations completed nominally.

1.4 Completed WF/PC-2 8632 (A UV Atlas of Nearby Galaxies)

The WF/PC-2 was used to perform a snapshot survey of local galaxies
at UV wavelengths with the F300W filter. The aim of the project is to
build a reference UV Atlas of normal galaxies, whose optical images are
well known, with the highest possible degree of information, covering all
the morphological types and luminosity classes. The proposal completed
normally.

1.5 Completed Two Sets of STIS/CCD 8562 (Probing the Large Scale
Structure: Cosmic Shear Observations)

The Space Telescope Imaging Spectrograph (CCD) was used to probe
the distortion of light bundles from distant galaxies, looking at the
statistical properties of the intervening inhomogeneous {dark} matter
distribution. The proposal completed nominally.

1.6 Completed STIS/CCD 8838 (Bias Monitor - Part 1)

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 nominally.

1.7 Completed STIS/CCD 8664 (Structural Measurement of Globular
Clusters in M31 and NGC 5128: Stalking the Fundamental Plane)

The Space Telescope Imaging Spectrograph (CCD) was used to observe
in the snapshot mode to image a wide selection of individual globular
clusters in two other large galaxies {M31 and NGC 5128} for measurement of
their structural parameters {r_c, c, central surface brightness}. We will
use these to compute their binding energies and define the FP in these two
galaxies. Comparison with the Milky Way will then give us powerful new
information on just how ``universal'' the cluster formation process was in
the early protogalaxies. The observations completed with no reported problems.

1.8 Completed STIS/CCD 7462 (Velocity Structure in High Redshift Galaxies)

The Space Telescope Imaging Spectrograph (CCD) was used to observe
a recently-discovered optical Einstein ring. The presence of a strong
Ly_Alpha emission line in the spectrum of the ring allows one to map the
position of the emission line peak around the ring, thereby measuring
velocity differences in the extended source object, a star-forming galaxy
at z=3.6. The observations completed nominally, with no reported problems.

1.9 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 Group. The proposal completed with no reported
problems.

1.10 Completed WF/PC-2 8822 (Decontaminations and Associated
Observations Pt. 1/4)

The Wf/PC-2 was used for 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},
UV throughput check, VISFLAT sweep, and internal UV flat check. There were
no reported problems.

1.11 Completed WF/PC-2/STIS/CCD 8559 (The Role of Dark Matter in
Cluster Formation and Galaxy Evolution)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to observe the outer regions of massive clusters that represent
transitional areas of great cosmological importance where field galaxies
encounter the steep potential wells of dark matter and baryonic hot
gas. Little is known about either the dark matter profile at large radii
or the morphological properties of infalling galaxies at those redshifts
where strong evolution is observed in the cluster cores. The proposal
completed normally, with no reported problems
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The following scheduled proposals were not executed due to the WF/PC-2 safing:

WF/PC-2 8586 (Observations of Astrophysically Important Visual Binaries)
WF/PC-2 8826 (Cycle 9 Supplemental Darks pt 1)

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2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:
Scheduled Acquisitions: 4
Successful: 4

Scheduled Re-acquisitions: 12
Successful: 12

2.2 FHST Updates:
Scheduled: 10
Successful: 10

2.3 Operations Notes:

Using ROP SR-1A, the SSR EDAC error counter was cleared twice.

SI C&DH errors were cleared at 306/2253Z and at 307/0255Z per ROP NS-5.

The WF/PC-2 was successfully safed at 306/223507Z with real-time
commanding contained in an operations request. That decision was made in
response to newly observed anomalous behavior of the shutter
mechanism. The WF/PC-2 Anomaly Review Board has identified a modification
to the WF/PC-2 slight software that can compensate for the erroneous
sensing of the shutter blade position. The timing associated with the
blade position sensing can be extended to significantly increase the
probability of capturing the true position of the shutter blade. The
flight software patch is scheduled to be installed on day 313 (November 8).

Engineering status buffer limits were adjusted at 307/0205 as
directed by ROP DF-18A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/CAW