HUBBLE SPACE TELESCOPE

   DAILY REPORT #2902

PERIOD COVERED:  0000Z (UTC) 06/26/01 - 0000Z (UTC) 06/27/01

Daily Status Report as of 178/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Two Sets of WF/PC-2 9045 (The Relationship Between Radio 
Luminosity and Radio-Loud AGN Host Galaxy Properties)

        The WF/PC-2 was used to determine the relationship between the 
properties of the host galaxies of radio-loud AGN and their radio 
luminosities.  Previous studies in this area with the HST have concentrated 
on the 3C sample which shows a tight correlation between luminosity and 
redshift, such that evolutionary effects cannot be distinguished from those 
depending upon radio luminosity.  Our sample of 46 radio galaxies at z ~ 
0.5 comes from four complete, low-frequency-selected samples of radio 
sources with differing flux limits.  Thus the total sample spans an 
unprecedented three orders of magnitude in radio luminosity at a fixed 
redshift interval.  The proposal completed with no reported problems.

    1.2 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.

    1.3 Completed WF/PC-2 8270 (Proper Motion of the Leo II Dwarf Spheroidal)

        The WF/PC-2 was used to continue the investigation into the proper 
motion of distant satellites of the Milky Way with a series of HST 
snapshots around faint galaxies within the Leo II astrometric field.  A 
proper motion for Leo II will be determined by combining images from 111 
Palomar 200" photographic plates taken by Baade between 1950-1959 with the 
HST snapshots.  Only with the fine pixel scale of HST can we realistically 
hope to match the exquisite Baade images, which were all taken on the very 
best nights from a decade of Baade's allotment of about forty 200 arcsecond 
nights a year.  The observations completed with no reported problems.

    1.4 Completed WF/PC-2 8230 (Snapshot Survey of Dynamically Close Galaxy 
Pairs from z=0.1 to z=0.5)

        The WF/PC-2 was used to make snapshot survey observations of 
galactic cluster Gal-Clus-0.  This is to obtain snapshot images of a large, 
well-defined, and dynamically selected sample of close galaxy pairs at 
moderate redshift.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.5 Completed WF/PC-2 8723 (A Snapshot Survey of Galactic Globular 
Clusters)

        The WF/PC-2 was used to observe the crowded centers of globular 
clusters {GCs} that heretofore have produced intriguing discoveries of new 
phenomena, most of which are not understood theoretically.  The 
observations completed with no reported problems.

    1.6 Completed WF/PC-2 8820 (Wavelength Stability of Narrow Band and 
Linear Ramp Filters)

        The WF/PC-2 was used to verify the mapping of wavelength as a 
function of CCD position on linear ramp filters and to check for changes in 
central wavelengths of the narrow band filters.  The proposal completed 
nominally.

    1.7 Completed Three Sets of WF/PC-2 8634 (Atmospheric Variability on 
Uranus and Neptune)

        The WF/PC-2 was used to obtain snapshot observations of Uranus and 
Neptune to monitor changes in their atmospheres on time scales of months to 
years.  Uranus is rapidly approaching equinox in 2007, with another 4 
degrees of latitude in the northern hemisphere becoming visible every 
year.  Recent HST images during this unique epoch have revealed: {i} 
strongly wavelength-dependent latitudinal structure, {ii} the presence of 
numerous visible-wavelength cloud features in the northern hemisphere, and, 
{iii} in the near-IR, discrete features northward of 25degrees N that have 
the highest contrast ever seen for a Uranian cloud.  Long-term ground- 
based observations show seasonal brightness changes whose origins are not 
well understood.  Recent IR images of Neptune obtained using adaptive 
optics on the Keck Telescope indicate that a new "Bright Companion" type of 
feature has recently appeared in the southern hemisphere.  Snapshot 
observations of these two dynamic planets can supply context in which to 
discern the nature of long-term changes in their latitudinal atmospheric 
bands and to track the appearance, movement, and disappearance of discrete 
albedo features.  There were no reported problems.

    1.8 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.

    1.9 Completed WF/PC-2 8181 (Resolving Sirius-like Binaries)

        The WF/PC-2 was used to make observations of the star HR8210 in 
order to try and resolve these Sirius-like binary star systems.  Subsequent 
determinations of the visual orbits of the resolved binaries with the HST 
will provide dynamical measurements of the white-dwarf masses.  The 
observations were completed as scheduled, and no anomalies were reported.

    1.10 Completed Three Sets of WF/PC-2 8345 (Multipolar Bubbles and Jets 
in Very Low Excitation Planetary Nebulae - A WF/PC-2 H-Alpha Imaging Survey)

        The WF/PC-2 was used to make H-Alpha observations of the very low 
excitation planetary nebula PK013-04D1 in order to study its multipolar 
bubbles and jets.  Comparison of the morphology of this young PNe sample 
with more evolved PNe populations will set new constraints on models for 
the production of jet-like outflows and nebular evolution.  The 
observations were completed as planned, and no problems were reported.

    1.11 Completed WF/PC-2 9268 (Hubble Heritage Observations of Mars at 
Opposition)

        The WF/PC-2 was used to obtain images of Mars at opposition.  This 
opposition offers the largest angular size of Mars yet during the Hubble 
mission.  The observations completed with no anomalous activity.

    1.12 Completed WF/PC-2 8192 (A Snapshot Survey of Probable Nearby Galaxies)

        The WF/PC-2 was used to make a snapshot survey images of a probable 
nearby galaxy KK035.  The census of galaxies in the Local Volume of space 
is very incomplete, particularly at the faint end.  The observations were 
executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 15
Successful: 15

  Scheduled Re-acquisitions:  1
Successful:  1

    2.2 FHST Updates:
Scheduled: 36
Successful: 36

    2.3 Operations Notes:

        The STIS instrument remains in safe mode.

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

        Per ROP DF-18A, the engineering status buffer limits were adjusted 
once.

        At 177/171122Z, the parameter GRG2_3MC (the RGA 2-3 motor current) 
jumped to 151.2 milliamps from its nominal average value of 126 milliamps, 
and is remaining out-of-limits.  Acquisitions continue to be 
nominal.  Initial data analyses show a slight decrease in the gyro heater 
duty cycle; however, a more accurate thermal assessment will require a 
minimum of 12 hours of continuous data.  Thermal changes are indicative of 
a lube patch event.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW