HUBBLE SPACE TELESCOPE

   DAILY REPORT #2911

PERIOD COVERED:  0000Z (UTC) 07/10/01 - 0000Z (UTC) 07/11/01

Daily Status Report as of 192/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Three Sets of WF/PC-2 8599 (A Census of Nuclear Star 
Clusters in Late-Type Spiral Galaxies)

        The WF/PC-2 was used to conduct an I-band snapshot survey of a 
well-defined sample of nearby, face-on spiral galaxies of type Scd or 
later.  The proposal completed nominally.

    1.2 Completed Two 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.

    1.3 Completed Four Sets of WF/PC-2 8602 (A Snapshot Survey of the Sites 
of Recent, Nearby Supernovae)

        The WF/PC-2 was used to conduct a snapshot survey in V and I of the 
sites of the nearby SNe, which have precisely known positions, to obtain 
high-resolution information on their local environment.  The proposal 
completed with no reported problems.

    1.4 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.

    1.5 Completed WF/PC-2 8773 (Expansion Parallax Distances to Planetary 
Nebulae)

        The WF/PC-2 was used to observe planetary nebulae {PNe} for which 
the lack of reliable distances is especially troubling.  Acquired by 
generalized statistical methods in all but a handful of cases, individual 
PNe distances are often uncertain by factors of two or more.  The 
observations completed nominally.

    1.6 Completed Three 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.

    1.7 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.

    1.8 Completed Four Sets of WF/PC-2 8701 (Multiplicity among Very-Low 
Mass Stars and Brown Dwarfs in Alpha Persei and the Pleiades)

         The WF/PC-2 was used to observe open clusters which provide 
excellent hunting grounds for brown dwarf {BD} searches.  The AlphaPer and 
Pleiades clusters are young, nearby and have low extinction.  They are 
considered to be the best-suited places to study the Substellar Mass.  A 
dozen of cool faint AlphaPer and Pleiades members have been confirmed as 
``bona-fide'' BDs with the lithium test.  By comparison with those, about 
60 very good cluster BD candidates are currently known.  The Pleiades SMF 
obtained using the most recent deep large CCD surveys indicates that BDs 
are quite numerous but do not make a significant contribution to the total 
cluster mass.  The observations completed with no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 13
Successful: 13

  Scheduled Re-acquisitions:  4
Successful:  4

    2.2 FHST Updates:
Scheduled: 21
Successful: 21

    2.3 Operations Notes:

        At 191/132013Z, the Science Mission Specification (SMS) began 
commanding the STIS instrument from safe to hold, then to boot, to TEC 
turn-on with a lower current setting, and finally to operate at 
approximately 191/1330Z.  All transitions appeared to be nominal.  The 
staged CCD (TEC) cool down began at 191/1650Z.  The CCD det housing 
temperature appears to be stabilizing at approximately 13.5 degC.  The MAMA 
low voltage was successfully enabled at 191/1855Z.  A slight concern 
occurred when the STIS total current draw observed reached 9.44 amps, only 
0.23 amps below its safing limit.  This happened when the spacecraft bus 
voltage was at its lowest point in the orbit.  At this time the STIS 
internal voltage monitor was reading 26.1, meaning that STIS was drawing 
246 amps.  Since activation of the MAMA low voltage, the heater power has 
begun to rapidly decrease, alleviating concerns of an over current condition.

        A TTR was written for a period of no UPD/GCMR capability from 
191/0121Z until 191/1325Z due to a While Sands Ground Terminal problem.

        Using ROP SR-1A, the SSR EDAC error counter was cleared at 191/2013Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        At 191/2350Z, the STIS CCD pre-anneal images will begin.  Then, at 
192/0200Z, the CCD anneal will start and continue for 12 hours.  At 
192/1401Z, the TEC will be turned back on at the higher current 
setting.  CCD observations will start at 192/1721Z.  At 193/0017Z, the MAMA 
high voltage turn on will commence.

        Continuation of normal science observations and calibrations.

/CAW