HUBBLE SPACE TELESCOPE

   DAILY REPORT #2595

PERIOD COVERED:  0000Z (UTC) 04/04/00 - 0000Z (UTC) 04/05/00

Daily Status Report as of 096/0000Z

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 8799 (Calibration of STIS End of Slit 
Pseudo-Aperture Locations)

        The Space Telescope Imaging Spectrograph (CCD) was used to 
determine precise locations for new pseudo-apertures to be defined centered 
at row 900 on the CCD, measure throughputs for those locations relative to 
the slit center, verify the spectral trace form at that location, and 
validate ACQ/PEAK procedures for acquiring targets in the narrow 52X0.05 
and 52X0.10 apertures at those locations.  The proposal completed nominally.

    1.4 Completed Five Sets of WF/PC-2 8090 (POMS Test Proposal: WF-II 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used in the parallel mode to make some low galactic 
latitude archive observations.  The program will be used to take parallel 
images of random areas of the sky.  The observations were executed as 
scheduled, and no anomalies were noted.

    1.5 Completed Two Sets of STIS/CCD 8549 (POMS Test Proposal: 
Non-Scripted Parallel Proposal Continuation I)

        The Space Telescope Imaging Spectrograph (CCD) was used to make low 
galactic latitude, non-scripted parallel observations as part of a POMS 
test proposal.  The observations were completed as planned, and no 
anomalies were reported.

    1.6 Completed Two Sets of STIS/CCD 8437 (Dark Monitor-Part 2 C8)

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

    1.7 Completed STIS/CCD 8217 (Tests of Stellar Models Using Four 
Extremely Massive Spectroscopic Binaries in the R136 Cluster)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
four non-interacting double-lined spectroscopic binaries discovered in the 
R136 cluster by the Cycle 6 FOS spectroscopy.  The proposal completed 
nominally.

    1.8 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.

    1.9 Completed Two Sets of WF/PC-2 8448 (Cycle 8 INTFLAT Sweeps, VISFLAT 
Mini-Sweep, and Linearity Test)

         The WFPC2 was used to monitor the pixel to pixel flatfield 
response and the VISFLAT lamp degradation, as well as detect any possible 
changes due to contamination.  The observations completed nominally.

    1.10 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.

    1.11 Completed WF/PC-2 8031 (Gaseous Disks in Galactic Nuclei)

        The WF/PC-2 was used to make observations of the gaseous disk in 
galactic disk of galaxy NGC-4552.  Follow-up long-slit medium resolution 
STIS spectroscopy along the principle axis of the nuclear gas disk will 
then be used to map the gas kinematics.  The observations were executed as 
scheduled, and no anomalies were noted.

    1.12 Completed STIS/CCD/MA1 8284 (Deep STIS Observations of BALQSO PG 
0946+301)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
study AGN outflows to determine of the ionization equilibrium and 
abundances (IEA) in broad absorption line {BAL} QSOs.  In the last few 
years it has become clear that partial coverage of the continuum source and 
saturation are common in BALs, and these frustrate attempts to determine 
the IEA from available HST data because of limitations imposed by the S/N 
ratio and spectral coverage. We will re-observe the most suitable BAL IEA 
target: PG 0946+301.  The observation completed with no reported problems.

    1.13 Completed WF/PC-2 8457 (UV Earth Flats)

        The WF/PC-2 was used to obtain a series of Ultraviolet Earth 
flats.  The observations were completed with no reported problems.

    1.14 Completed Four Sets of WF/PC-2 8445 (WF/PC-2 Cycle 8 Earth Flats)

        The WF/PC-2 was used to make Cycle 8 Earth flat calibration 
observations.  This is to obtain sequences of earth streak flats to 
construct high quality flat fields for the WF/PC-2 filter set.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.15 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.

    1.16 Completed STIS/CCD 8228 (The Black Hole Versus Bulge Mass 
Relationship in Spiral Galaxies)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the galaxy NGC-3949 in order to study the black hole versus 
bulge mass relationship in spiral galaxies.  A wavelength calibration image 
was also taken.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.17 Completed WF/PC-2 8544 (POMS Test Proposal: WFII Backup Parallel 
Archive Proposal II)

        The WF/PC-2 was used to execute a POMS test proposal which was 
designed to simulate scientific plans.  No problems were encountered.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 7
Successful: 7

  Scheduled Re-acquisitions: 8
Successful: 8

    2.2 FHST Updates:
Scheduled: 19
Successful: 19

    2.3 Operations Notes:

        ROP SR-1A was used twice to clear the SSR EDAC error counter.  ROP 
IC-1 was used twice to cycle the MA transmitter power.  ROP IC-2 was used 
twice to turn SSA transmitter #2 on and off.

        The CCS ground system was interrupted at 095/1414Z due to network 
problems that occurred as a result of on-going work being performed at the 
Science Institute.  "A" string was returned to service at 095/1728Z.

        Per an operations request, the NICMOS FPA temperature sensor for 
detector 3 was enabled at 096/0612Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW