HUBBLE SPACE TELESCOPE

   DAILY REPORT #2623

PERIOD COVERED:  0000Z (UTC) 05/12/00 - 0000Z (UTC) 05/15/00

Daily Status Report as of 136/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Four 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/MA1 8433 (Angle Corrections for MAMA)

        The Space Telescope Imaging Spectrograph (MA1) was used to run a 
test in order to provide incidence angle corrections for MAMA observations 
using non-concentric slits.  The proposal completed with no reported problems.

    1.3 Completed STIS/CCD 8187 (STIS Imaging of the Deep NICMOS Parallel 
Fields: Building on the NICMOS Legacy)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of field #1039 that was previously observed using deep images 
from the NICMOS camera.  The STIS images will yield visual morphologies to 
magnitudes of 24.5 and quantitative measures of image structure to 26.5 or 
fainter in two orbits.  The observations were completed as planned, and no 
problems were reported.

    1.4 Completed Nine 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.

    1.5 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 that was 
designed to simulate scientific plans.  No problems were encountered.

    1.6 Completed Three 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.

    1.7 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-4212 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.

    1.8 Completed WF/PC-2 8100 (Calibration of Nearby Type Ia Supernovae as 
Standard Candles: The Next Step)

        The WF/PC-2 was used to continue the calibration experiment for 
M{max} of type Ia supernovae {SNe Ia} by determining Cepheid distances to 
their parent galaxies.  The proposal completed nominally.

    1.9 Completed STIS/CCD 8489 (Searching for the Hydrogen Reionization 
Edge of the Universe at 5HST)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
36 parallel orbits {4--5 fields of 5--8 orbits each} to constrain the H 
Lyman-edge in emission that marks the transition from a neutral to a fully 
ionized IGM.  This edge is due to recombination from the H Lyman series and 
Lyman continuum, and can be used to constrain zion, one of the most 
important unknown quantities in large scale structure and cosmology.  The 
proposal completed nominally.

    1.10 Completed Five 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.

    1.11 Completed Three Sets of 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.

    1.12 Completed STIS/CCD/MA1/MA2 8424 (MAMA Sensitivity and Focus 
Monitor C8)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to make observations of object GRW+70D582 in order to measure the 
sensitivity and to focus monitor C8.  This also is to monitor sensitivity 
of each MAMA grating mode to detect any change due to contamination or 
other causes, and to monitor the STIS focus in a spectroscopic mode.  A 
wavelength calibration was also taken.  The observations were completed as 
planned, and no anomalies were reported.

    1.13 Completed Two Sets of STIS/CCD 8797 (Spectroscopic Flats C8 - Late 
Continuation)

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
Cycle 8 STIS CCD flat program in order to provide monitoring information to 
S/N levels up to about 600 which should be sufficient for the vast majority 
of science observations.  The observation completed nominally.

    1.14 Completed 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/CCD 8789 (Probing the Outskirts of an Extrasolar 
Planet: Photometry and Spectroscopy)

        The Space telescope Imaging Spectrograph (CCD) was used to observe 
HD 209458, the first extrasolar planet known to transit the disk of its 
parent star, providing unique probes of this system for moons, rings and 
atmospheric composition that are unlikely to be feasible with ground-based 
observations.  The proposal completed normally, with no reported problems.

    1.16 Completed WF/PC-2 8240 (Masses and Spins of Black Holes in Seyfert 
Galaxies)

        The WF/PC-2 was used to observe about 20 bright Seyfert 1 galaxies 
that are now known to have very broad {up to 100, 000 km s^-1} Fe KAlpha 
emission lines near 6.4 keV.  The observations completed nominally.

    1.17 Completed Two Sets of STIS/CCD 8411 (STIS CCD Spectroscopic Flats C-8)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
CCD flats in the spectroscopic mode.  The observations were completed as 
scheduled, and no anomalies were reported.

    1.18 Completed STIS/CCD 8412 (STIS CCD Imaging Flats C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to 
investigate the flat-field stability of the unit over a monthly period.  A 
bias calibration observation was also taken.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.19 Completed WF/PC-2 8118 (Snapshot Survey of Galactic Globular Clusters0

        The WF/PC-2 was used to make observations of crowded centers of 
globular clusters {GCs} which have produced intriguing discoveries of new 
phenomena, most of which are not understood theoretically. This is a 
continuation of a Cycle 7 snapshot proposal, to extend such work to a much 
larger portion of the Galactic GC system.  The observations completed 
nominally, with no reported problems.

    1.20 Completed FGS 8463 (Long Term Stability of FGS1R in Transfer Scan 
Mode)

        The Fine guidance Sensors were used to make astrometric 
observations of star UPGREN69 and several other reference stars in order to 
study the long term stability of FGS-1R in the Transfer Scan Mode.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.21 Completed WF/PC-2/STIS/CCD 8213 (Globular Clusters of Low Surface 
Brightness Galaxies)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were 
used to investigate globular cluster {GC} systems in giant low surface 
brightness {LSB} galaxies.  The primary goals of the project are to 
determine the number of GCs in two nearby LSB galaxies and to estimate 
their ages.  LSB spirals tend to be more isolated, more gas rich, and have 
had more quiescent star formation than their high surface brightness {HSB} 
cousins.  LSB galaxies have either been forming stars very slowly for a 
Hubble time or have formed within the last few Gyr. T hus, their star 
formation histories may be very different from those of HSB galaxies.   The 
proposal completed nominally.

    1.22 Completed Two Sets of STIS/CCD/MA1/MA2 8484 (Physical Properties 
of H I AND H II Regions)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to observe Interstellar absorption lines within the wavelength 
intervals 1170-1370A and 1630-1890A in the spectra of 10 early-type 
stars.  The following objectives were achieved: {1} to measure the 
populations of the fine-structure levels of O I, C I and Si II within H I 
and H II regions, {2} to determine the ionization ratios Al I/Al III {the 
Al II line will probably be too saturated}, S I/S II/S III, and Si I/Si 
II/Si III, and {3} to measure the abundances of Mg, O, S, Ni and Si from 
unsaturated lines arising from their preferred ionization stages in H I 
regions. Objectives {1} and {2} should define local kinetic temperatures, 
densities of H atoms {both neutral and ionized}, and also the ratios of uv 
ionizing photons to electrons.  The proposal completed nominally.

    1.23 Completed STIS/MA1/MA2 8426 (Cycle 8 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA1 and MA2) was used to 
make routine Cycle-8 MAMA dark noise calibration measurements.  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.

    1.24 Completed STIS/CCD/MA1 8170 (Kinematics of the Young Star Clusters 
and the Gas in the Antennae Galaxies)

        The Space Telescope Imaging Spectrograph (CCD) was used to follow 
up on the previous discovery of over 1000 young star clusters in "The 
Antennae'' {NGC 4038} by obtaining long-slit and slitless spectra of a 
representative sample of clusters with STIS.  These young clusters have the 
luminosities, colors, and radii expected of young globular clusters and 
must have formed during the ongoing merger.  Because of their proximity and 
early stage of merging, the disks of NGC 4038 form an ideal laboratory to 
study cluster formation in progress.  The observations completed nominally.

    1.25 Completed STIS/CCD/MA1/MA2 8280 (Origins, Structure and Evolution 
of Magnetic Activity in the Cool Half of the H-R Diagram: A STIS Survey)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to make observations of star HD72779 to carry out part of a major 
ultraviolet spectral survey of "coronal" late-type stars.  A wavelength 
calibration image was also taken.  The observations were executed as 
scheduled, and no anomalies were noted.

    1.26 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 HD194144 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.

    1.27 Completed STIS/CCD 8418 (CCD Sensitivity Monitor C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of standard source AGK+81D266 as part of a CCD 
sensitivity-monitoring program in Cycle-8.  The sensitivity of each CCD 
grating mode is monitored to detect any change due to contamination or 
other causes.  A wavelength calibration image was also taken.  The 
observations were completed as planned, and no anomalies were reported.

    1.28 Completed WF/PC-2 8173 (Alignment and Evolution of Redshift One 
Radio Galaxies)

        The WF/PC-2 was used to observe galaxies associated with powerful 
distant radio sources which are the most massive ellipticals known at early 
cosmic epochs, and are also uniquely important for understanding the 
physics of AGN and the interactions between the radio source and its 
environment.  The observations completed with no reported problems.

    1.29 Completed STIS/CCD 8796 (POMS Test Proposal: STIS Non-Scripted 
Parallel Proposal Continuation IV)

        The Space Telescope Imaging Spectrograph (CCD) was used in the 
parallel mode to make some low galactic latitude archive observations.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.30 Completed STIS/CCD 8419 (Deep Corongraphic PSF Calibration of STIS)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of standard star HD115617 in order to do a deep coronographic 
Point Spread Function (PSF) calibration observations. This is to acquire a 
set of deep, coronographic images of isolated, point source stars with STIS 
for the purpose of correcting coronographic science observations for 
residual scattered light from the occulted object.  The observations were 
completed as planned, and no anomalies were reported.

    1.31 Completed STIS/CCD/MA1/MA2 8198 (Understanding the Starburst-like 
Dust in the Small Magellanic Cloud)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to investigate the similarities between the ultraviolet extinction 
found in the star forming bar of the Small Magellanic Cloud {SMC} and 
starburst galaxies has highlighted the importance of understanding the dust 
extinction in the SMC.  The proposal completed with no reported problems.

    1.32 Completed STIS/CCD/MA1/MA2 8265 (Reverberation Mapping of a 
Narrow-Line Seyfert 1 Galaxy)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to monitor the UV spectral variability of the narrow-line Seyfert 1 
{NLS1} galaxy AKN 564 at 46 epochs in order to measure the size of the 
broad emission-line region via reverberation-mapping techniques.  This 
measurement, and the virial mass estimate that follows from it, will 
provide a key test of NLS1 models and help determine the physical mechanism 
that underlies the principal component of AGN spectra, the Boroson--Green 
primary eigenvector.  These observations will be undertaken in parallel 
with X-ray and ground-based optical observations that will allow us for the 
first time to explore the multiwavelength variability characteristics of 
this important subclass of active galactic nuclei.  The observations 
completed with no reported problems.

    1.33 Completed STIS/CCD/MA1/MA2 8264 (PDS 456: A Radio-Quiet Analogue 
of 3C 273)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to understand the nature of Active Galactic Nuclei {AGN}.  It is 
important to explore the full range of parameter space occupied by these 
powerful objects.  Now, we have a newly discovered quasar, PDS 456, which 
our IR/optical/X-ray data suggests may be the most luminous object in the 
local Universe.  PDS 456 is radio-quiet, and therefore provides a view of 
the nucleus relatively unaffected by the relativistic jet, which either 
dominates or contaminates the observed emission from 3C 273, the original 
quasar.  The observations completed nominally.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 22
Successful: 22

  Scheduled Re-acquisitions: 21
Successful: 21

    2.2 FHST Updates:
Scheduled: 58
Successful: 58

        Although the roll delay update was eventually successful, the 
target suppress flag (GTATSUB2) failed at 134/165551Z, near the beginning 
of the maneuver.  HSTAR 7602 was written.

    2.3 Operations Notes:

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

        PRD 41.01 was successfully installed on CCS string "B" at 133/1541Z.

        Operations Note #731 was utilized at 135/0133Z to adjust the 
recharge ratio upper limit for the sun/orbit time.

        The SI C&DH error reset and reporting ROP, NS-5, was executed at 
135/1304Z.

        Per ROP DF-18, the engineering status buffer limits were changed at 
135/2111Z.

        The NSSC-1 status buffer was dumped at 136/0505Z as directed by ROP 
NS-3.

        CCS string "C" was configured to support a test at 136/0826Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW