HUBBLE SPACE TELESCOPE

   DAILY REPORT #2630

PERIOD COVERED:  0000Z (UTC) 05/23/00 - 0000Z (UTC) 05/24/00

Daily Status Report as of 145/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Three Sets of WF/PC-2 8460 (Cycle 8 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 observations completed with no reported problems.

    1.2 Completed STIS/CCD 8439 (Bias Monitor-Part 2 C8)

        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 reported problems.

    1.3 Completed STIS/CCD/MA1 8241 (A Snapshot Survey of Interstellar 
Absorption Lines)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make high resolution Echelle spectrographic observations of the standard 
ultraviolet star HD86360 as part of a snapshot survey of interstellar 
absorption lines.  A wavelength calibration image was also taken.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.4 Completed WF/PC-2 8095 (Accurate Proper Motions of Galactic Halo 
Populations)

        The WF/PC-2 was used to make observations of the galaxy LMC-HALO in 
order to study the proper motion of its galactic halo population, which 
include globular clusters and dwarf galaxies.  The proper motions of these 
populations will be determined to unprecedented accuracy, approximately an 
order of magnitude better than has been previously possible.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.5 Completed STIS/CCD 8437 (Dark Monitor-Part 2 C8)

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

    1.6 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal - Nearby 
Galaxies - Imaging and Spectroscopy)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
parallel observations of nearby galaxies.  This survey will be useful to 
study the star formation histories, chemical evolution, and distances to 
these galaxies.  These data will be placed immediately into the Hubble Data 
Archive.  The observations were completed as scheduled, and no problems 
were reported.

    1.7 Completed WF/PC-2 8251 (The Second-Parameter Effect in Metal- Rich, 
Globular Clusters: A Snapshot Study of NGC 6441)

        The WF/PC-2 was used to observe the newly- discovered hot 
horizontal branch (HB) populations in the metal-rich globular cluster (GC) 
NGC 6441 providing an unique opportunity for unraveling the 
second-parameter effect.  While it has long been known that at least one 
parameter besides the metallicity, Fe/H, determines the HB morphology of 
GCs, our ignorance as to the nature of this second parameter {or 
parameters} has been a major stumbling block in understanding the formation 
history and age of the GC system.  The proposal completed nominally with no 
reported problems.

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

        The WF/PC-2 was used to make observations of the star ZETA-CYG 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.

    1.9 Completed STIS/CCD 8808 (POMS Test Proposal: STIS Non-Scripted 
Parallel Proposal Continuation III)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
non-scripted, parallel observations as part of a POMS test proposal.  The 
observations completed with no anomalous activity.

    1.10 Completed STIS/CCD 8106 (The Mass Of The Black Hole In Cygnus A)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
supermassive black holes which are thought to be the main power source for 
the jets and active components of radio galaxies, the relationship between 
the masses of the black holes, and the bulges of the host galaxies.  The 
radio activity are not understood with any certainty.  Part of the problem 
has been the lack of suitable dynamical tracers in the nuclei of the radio 
source host galaxies.  Using HST imaging observations we have recently 
detected a high surface brightness disk structure at the center of the 
archetypal powerful radio galaxy Cygnus A.  The observations completed with 
no reported anomalies.

    1.11 Completed Two 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.  The proposal completed with no reported problems.

    1.12 Completed STIS/MA1/MA2 8201 (Ultra-luminous Infrared Galaxies)

        The Space Telescope Imaging Spectrograph (MA1 and MA2) was used to 
make ultraviolet observations of the ultra-luminous infrared galaxy 
IRAS15327.  Ultra-luminous Infrared Galaxies are the most luminous galaxies 
known in the local universe, and are predominantly powered by massive star 
formation.  The observations were executed as scheduled, and no anomalies 
were noted.

    1.13 Completed STIS/MA2 8426 (Cycle 8 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA2) was used to make a 
routine Cycle-8 MAMA dark noise calibration measurement.  This proposal 
will provide the primary means of checking on the health of the MAMA 
detectors.  This is done through frequent monitoring of the background 
count rate.  The observations were completed as planned, and no problems 
were reported.

    1.14 Completed WF/PC-2 8163 (Trapezium Systems and Stellar Jets in 
30-Doradus)

        The WF/PC-2 was used to make observations of the 30-Doradus system 
(both the North and South sections).  30-Doradus is the nearest and best 
resolved extragalactic starbursting region.  The observations were 
completed as scheduled, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

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

  Scheduled Re-acquisitions: 9
Successful: 9

    2.2 FHST Updates:
Scheduled: 13
Successful: 13

    2.3 Operations Notes:

        At 144/1857Z, per ROP NS-5, an SI C&DH error was reset.

        The NSSC-1 status buffer was dumped at 144/1944Z as directed by ROP 
NS-3.

        The engineering status buffer had its upper limit set to 5 at 
145/0438Z, using ROP DF-18A.

        The SSR science pointer was set at 145/0541Z per ROP SR-3.

        At 145/0925Z, SSA transmitter #2 was turned on, using ROP IC-2.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW