HUBBLE SPACE TELESCOPE

   DAILY REPORT #2916

PERIOD COVERED:  0000Z (UTC) 07/17/01 - 0000Z (UTC) 07/18/01

Daily Status Report as of 199/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed WF/PC-2 9160 (Disks and Envelopes of Nearby Nebulous 
Young Stellar Objects: A Snapshot Survey)

        The WF/PC-2 was used to perform a snapshot survey of nearby 
nebulous young stellar objects to study the detailed morphology of the 
their disks and envelopes and probe the effect of inclination on the 
infrared spectral energy distribution of disk/envelope systems.  The 
proposal completed as planned.

    1.2 Completed Eleven Sets of STIS/CCD 9248 (Probing the Large Scale 
Structure: Cosmic Shear Observations)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
the distortion of light bundles from distant galaxies that probe the 
statistical properties of the intervening inhomogeneous {dark} matter 
distribution.  Its tidal gravitational field distorts the observable image 
shapes thereby causing a coherent ellipticity pattern {Cosmic Shear}.  The 
observations completed nominally.

    1.3 Completed Three Sets of STIS/CCD 8864 (CCD Dark Monitor-Part 2)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the darks for the CCD.  The proposal completed nominally.

    1.4 Completed Three Sets of WF/PC-2 9255 (Cycle 10 WF/PC-2 Astrometric 
Effects of CTE)

        The WF/PC-2 was used to quantify the astrometric effects of CTE by 
measuring: {1} the relative separation of a bright source vs. a faint 
target at different positions on the PC1 CCD and {2} the relative motion of 
a source on the CCD compared to very precise slews performed with the 
FGSs.  These tests will be conducted for point and extended targets at 
several different intensity levels.  No problems were encountered.

    1.5 Completed Six Sets of WF/PC-2 9252 (Cycle 10 Clocks On Check)

        The WF/PC-2 was used to perform closure calibration for clocks 'on' 
mode, which obtains dark frames in order to provide data to create a clocks 
'on' super dark calibration reference file, to monitor and characterize the 
evolution of hot pixels, and to obtain standard star observations for 
photometric calibration.  The proposal completed with no reported anomalous 
activity.

    1.6 Completed STIS/CCD 8865 (Bias Monitor-Part 2)

        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 anomalous activity.

    1.7 Completed WF/PC-2 9085 (Measuring The Masses Of High-Z Quasar Host 
Galaxies)

        The WF/PC-2 was used to investigate the close link between 
black-hole mass and spheroid mass in both quiescent and active galaxies in 
the local universe.  Consequently black-hole and spheroid formation/growth 
are now viewed as intimately related processes, and establishing the mass 
of quasar host galaxies as a function of redshift is now seen as a key 
measurement in observational cosmology.  From the Cycle 7 NICMOS program, 
the best estimate to date of the mass evolution of the hosts of both 
radio-quiet and radio-loud quasars out to z ~eq 2 has been derived.  Under 
the assumption of passive stellar-population evolution our results are 
consistent with the black-hole/spheroid population being unchanged out to z 
~eq 2.  However, the crucial assumption of passive evolution needs to be 
tested.  All observations competed nominally.

    1.8 Completed Three Sets of WF/PC-2 8828 (Cycle 9 Supplemental Darks pt3/3)

        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 proposal completed with no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  6
Successful:  6

  Scheduled Re-acquisitions: 10
Successful: 10

    2.2 FHST Updates:
Scheduled: 10
Successful: 10

    2.3 Operations Notes:

        The SSR EDAC error counter was cleared twice per ROP SR-1A.

        As described in HSTAR 8276, the MCEA electronics temperature 
parameter (SMAELEXT) flagged out-of-limits high with a value of 49.0925 at 
198/175633Z.  The upper limit is 49.  This temperature sensor is in bay 8, 
toward the +V3 axis, facing the Sun.

        The STIS MCE-1 reset at 198/092055Z, while the high voltage was off 
and while inside an SAA interval.  MAMA-1 will be recovered next week via 
normal SMS commanding, occurring at the time of the next high voltage on 
commanding.  The STIS flight software error counter was reset at 198/1002Z, 
using ROP NS-12.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW