HUBBLE SPACE TELESCOPE

   DAILY REPORT #2897

PERIOD COVERED:  0000Z (UTC) 06/19/01 - 0000Z (UTC) 06/20/01

Daily Status Report as of 171/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed 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.

    1.2 Completed WF/PC-2 8592 (Pixel Microlensing of M87)

        The WF/PC-2 was used to undertake a pixel microlensing study of M87 
in order to: 1} probe the lower end of the M87 IMF via star-star lensing, 
2} possibly obtain the first evidence of Massive Compact Objects (MACHOs) 
in the halo of a galaxy other than our own, and 3} search for intracluster 
MACHOs.  The proposal completed nominally.

    1.3 Completed Two Sets of WF/PC-2 8815 (Cycle 9 Earth Flats)

        The WF/PC-2 was used to monitor flatfield stability.  This proposal 
obtains sequences of Earth streak flats to construct high quality flat 
fields for the WF/PC-2 filter set.  These flat fields will allow mapping of 
the OTA illumination pattern and will be used in conjunction with previous 
internal and external flats to generate new pipeline superflats.  The 
proposal completed nominally.

    1.4 Completed Two Sets of WF/PC-2 8601 (A Snapshot Survey of Probable 
Nearby Galaxies)

        The WF/PC-2 was used to continue the very successful snapshot 
survey in order to use the high spatial resolution of HST to determine 
whether selected galaxies are nearby on the basis of resolution into stars, 
and the magnitudes and colors of the brightest stars.  There were no 
reported problems.

    1.5 Completed WF/PC-2 8598 (Snapshot Survey of Extended OIIl Lambda 
5007Angstrom Emission in Seyfert Galaxies)

        The WF/PC-2 was used for a snapshot survey of narrow band OIII 
Lambda 5007Angstrom images for a well defined sample of 88 Seyfert galaxies 
{29 Seyfert 1s and 59 Seyfert 2s}, 18 of which already have data in the 
archive, selected from a mostly isotropic property, the 60Mum flux.  These 
data will be used: 1} to determine the origin of the misalignment between 
the accretion disk axis and the host galaxy plane axis, which can be due to 
mergers with other galaxies, or by the self induced radiation warping; 2} 
to compare the size and shape of the Narrow Line Regions (NLR) of Seyfert 
1s and Seyfert 2s, and to study the frequency of conically shaped NLR in 
Seyfert galaxies, which are usually unresolved from ground-based 
observations; and 3} estimate the importance of shocks to the ionization of 
the NLR.  The observations completed with no reported problems.

    1.6 Completed Two Sets of 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.

    1.7 Completed WF/PC-2 8585 (Cosmological Parameters from Type Ia 
Supernovae at High Redshift)

        The WF/PC-2 was used to measure the cosmological parameters, Omega, 
Lambda, and thus the curvature, Omega_k, using Type Ia supernovae {SNe Ia} 
as calibrated standard candles.  There were no reported problems.

    1.8 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.

    1.9 Completed Two Sets of  WF/PC-2 9133 (Imaging of Gravitational Lenses)

        The WF/PC-2 was used to observe gravitational lenses that offer 
unique opportunities to study cosmology, galactic structure, galaxy 
evolution, quasar hosts and extinction.  They are also the only sample of 
galaxies selected on the basis of their mass rather than their luminosity 
or surface brightness.  While gravitational lenses can be discovered with 
ground-based optical and radio observatories, converting them from 
curiosities into scientific tools requires HST.  There were no reported 
anomalies.

    1.10 Completed WF/PC-2 8644 (Galaxy Recycling in Clusters)

        The WF/PC-2 was used to obtain deep B, V, and I images of two 
unusual, extended, low surface brightness plumes of material recently 
discovered in the Coma and Centaurus clusters.  These plumes are most 
likely transient tidal debris resulting from the destruction of galaxies as 
they passed through the cores of these clusters.  Over time, this debris 
will spread throughout the cluster potential, augmenting the intergalactic 
populations of stars, globular clusters, dwarf galaxies, and gas.  Some of 
this material may also be incorporated into the halos of the central 
dominant galaxies.  There were no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

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

  Scheduled Re-acquisitions:  5
Successful:  5

    2.2 FHST Updates:
Scheduled: 25
Successful: 25

    2.3 Operations Notes:

        The Space Telescope Imaging Spectrograph (STIS) remains in 
safe.  The Bus C anomaly test was conducted yesterday per an operations 
request.  Starting at 170/1423Z, Main Bus C was energized and the STIS 
PDU-2 relay was closed.  Telemetry indicated that power was present at the 
input of STIS.  The STIS hold relay was closed for five seconds and then 
opened.  During this time the telemetry indicated that the load bus current 
rose from 60 amperes to 128 amperes in approximately 66 milliseconds.  The 
STIS PDU-2 Bus C fuse was cleared at 170/162326Z.  The high rate data 
format captured the current signature of the fuse blowing.  The STIS PDU-2 
relay was commanded back to open and the Main Bus C was de-energized.  The 
results of the test will have no impact upon the ongoing work on beginning 
STIS Side 2 operations.  All test data has been forwarded to the Failure 
Review Board for further analysis.

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

        ROP IC-2 was utilized for five intervals to manage the SSA 
transmitters.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        GSFC Internal Simulation #9 for the upcoming Servicing Mission will 
be conducted today in the MOR and other nearby facilities from 8:00 a.m. 
until approximately midnight.

        Continuation of normal science observations and calibrations.

/CAW