HUBBLE SPACE TELESCOPE

   DAILY REPORT #2815

PERIOD COVERED:  0000Z (UTC) 02/22/01 - 0000Z (UTC) 02/23/01

Daily Status Report as of 054/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed STIS/CCD/MA2 8681 (Snapshot Survey of Variability of 
Narrow and Broad Associated Absorption Lines in Quasars)

        The Space telescope Imaging Spectrograph (CCD and MA2) was used to 
investigate the variability in the strength of absorption lines in quasar 
spectra which is definitive proof that we are observing material that is 
physically associated with the quasars.  This proposal will conduct a STIS 
snapshot survey to provide second epoch observations of 37 quasars with 
narrow associated or broad absorption lines {NALs and BALs}, previously 
observed with the FOS.  At high redshift several intrinsic NALs and about 
two thirds of BALs are known to vary, often in accord with continuum 
variability.  The amplitudes increase and the timescales decrease with 
decreasing quasar luminosity.  The proposal completed nominally.

    1.2 Completed Three Sets of WF/PC-2 8827 (Cycle 9 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 proposal completed nominally.

    1.3 Completed STIS/MA2 8843 (Cycle 9 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA2) was used to perform 
the routine monitoring of the MAMA detector dark noise.  The proposal 
completed nominally.

    1.4 Completed WF/PC-2 8597 (The Fueling of Active Nuclei: Why are 
Active Galaxies Active?)

        The WF/PC-2 was used to investigate the accretion onto massive 
black holes that are believed to be the energy source for AGN.  However, 
evidence for black holes in quiescent galaxies has also been reported.  Why 
are these galaxies inactive?  One possibility is that active galaxies are 
better at providing fuel to the nuclear region than quiescent 
galaxies.  Other possible fueling mechanisms such as ``bars-within-bars'' 
or nuclear spirals cannot be investigated from the ground because they are 
relatively small features in the ISM.  The observations were completed as 
planned.

    1.5 Completed STIS/CCD/MA1/MA2 8779 (VV Cephei: The Egress from 
Chromospheric Eclipse)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to obtain STIS (and later FGS1R) observations of the long- period 
{20.3 yrs} eclipsing binary VV as it continues to emerge from chromospheric 
eclipse.  The observations completed with no problems.

    1.6 Completed Six 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.

    1.7 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.

    1.8 Completed STIS/CCD 8849 (Faint Standard Extension)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
fainter standard stars that are needed for the flux calibration of COS, 
while re-observations are required to check for variability and to improve 
S/N.  The observations completed nominally.

    1.9 Completed Two Sets of STIS/CCD 8881 (An Unbiased Survey of X-Ray 
and Optical Emission From Extended Radio Jets in AGN)

        The Space Telescope Imaging Spectrograph (CCD) was used to an X-ray 
bright jet in the distant quasar PKS 0637-752 that shows that X-rays can be 
energetically dominant in relativistic jets.  The observations completed 
nominally.

    1.10 Completed WF/PC-2 8683 (Imaging Of Brightest Cluster Galaxies: The 
High End Of The Black Hole Mass Distribution)

        The WF/PC-2 was used to make kinematic black hole detections in 
galaxies to decide whether they indicate that the mass correlates with both 
optical luminosity and radio power.  The observation completed with no 
reported problems.

    1.11 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.

    1.12 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.

    1.13 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.

    1.14 Completed STIS/CCD/MA1 8691 (Calibrating the Cosmic Meter Stick: 
The Distance to the LMC Using Eclipsing Binaries)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
measure the LMC distance which is crucial for the calibration of the Cosmic 
Distance Scale.  The observations completed with no reported problems.

    1.15 Completed WF/PC-2 8059 (POMS Test Proposal: Targeted Parallel 
Archive Proposal)

        The WF/PC-2 was used to observe the parallel opportunities 
available in the neighborhood of bright galaxies are treated in a slightly 
different way from the normal pure parallels.  Local Group galaxies offer 
the opportunity for a closer look at young stellar 
populations.  Narrow-band images in F656N can be used both to identify 
young stars via their emission lines, and to map the gas distribution in 
star-forming regions.  The observations completed nominally.

    1.16 Completed STIS/CCD/MA2 8627 (Testing Theories Of Wind/Jet 
Production In YSOs)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
test theories of jet/wind production from the accretion disks of low-mass 
young stellar objects, providing new insight into disk physics, accretion 
energy balance, and jet collimation.  Observations of the Fe II ultraviolet 
lines in absorption will probe lower-density and lower-temperature material 
than optical forbidden and permitted emission lines, and thus provide 
unique information on jet/wind launching and 
acceleration.  Velocity-resolved spectra will distinguish between X-wind 
models, in which all the mass ejection occurs from the inner disk edge, and 
disk wind models, where the flow originates from a much larger area of the 
disk.  The proposal completed nominally.

    1.17 Completed Two Sets of WF/PC-2 8816 (Cycle 9 UV Earthflats)

        The WF/PC-2 was used to obtain sequences of Earth streak flats to 
improve the quality of pipeline flat fields for the WFPC2 UV filter set and 
in order to monitor flat field stability.  There were no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 10
Successful: 10

  Scheduled Re-acquisitions:  6
Successful:  6

    2.2 FHST Updates:
Scheduled: 20
Successful: 17

        Per HSTAR 8084, the full maneuver updates scheduled for 053/122944Z 
and at 053/123229Z failed with error box results for FHST #3.  However, the 
following guide star acquisition was successful.

        The roll delay update scheduled for 053/140850Z failed due to FHST 
#3.  The subsequent guide star acquisition was successful.  HSTAR 8085 was 
written.

    2.3 Operations Notes:

        ROP DR-18A was used to update the engineering status buffer limits 
on four occasions.

        The SSR EDAC error counter was cleared at 053/1452Z per ROP SR-1A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW