HUBBLE SPACE TELESCOPE

   DAILY REPORT #2660

PERIOD COVERED:  0000Z (UTC) 07/07/00 - 0000Z (UTC) 07/10/00

Daily Status Report as of 192/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 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.

    1.2 Completed Three Sets of 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.

    1.3 Completed Six 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.

    1.4 Completed Seven Sets of WF/PC-2 8826 (Cycle 9 Supplemental Darks pt 1)

        The WF/PC-2 was used to perform a T dark calibration program that 
obtains three dark frames every day in order to provide data for monitoring 
and characterizing the evolution of hot pixels.  There were no reported 
anomalies.

    1.5 Completed WF/PC-2 8268 (Lensed Quasar Hosts at High Redshift)

        The WF/PC-2 was used to make observations of the high redshift, 
lensed quasar Q0230-2130.  Gravitational lensing offers a novel way to 
detect quasar host galaxies at z > 1 and to measure their properties.  The 
observations were completed as scheduled, and no anomalies were reported.

    1.6 Completed Two Sets of STIS/CCD 8104 (Constraints on the Evolution 
of Powerful Radio Galaxies)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of 3C277.1 and 3C303.1.  Recent work has identified the GHz 
Peaked Spectrum and Compact Steep Spectrum radio sources as the most likely 
candidates for the progenitors of the large-scale powerful classical double 
sources.  Both a wavelength calibration image and a CCD flat calibration 
image were also taken.  The observations were completed as planned, and no 
anomalies were reported.

    1.7 Completed Ten 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.

    1.8 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 #1647 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.

    1.9 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.

    1.10 Completed 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 
cosidered 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 candiates 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.

    1.11 Completed Six Sets of 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.

    1.12 Completed Three Sets of 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 galaxies NGC-0134, NGC-4088, and NGC-3259 in order to 
study the black hole versus bulge mass relationship in spiral 
galaxies.  Wavelength calibration images was also taken.  The observations 
were executed as scheduled, and no anomalies were noted.

    1.13 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 AGK+81D266 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.

    1.14 Completed Two Sets of STIS/CCD 8276 (UV Spectroscopic 
Investigation of any Bright, Newly Discovered Comet)

        The Space Telescope Imaging Spectrograph (CCD) was used to 
investigate a bright comet that was newly discovered during Cycle 8.  These 
comets include comets of any dynamical class.  There were no reported 
problems in any of the observations.

    1.15 Completed Three Sets of STIS/CCD/MA1 7481 (The Wind-momentum 
Luminosity Relationship for M31 and M33 B-supergiants)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make observations of the B class supergiant stars M-31-IV-B59, M33-0900, 
and M33-1137 which are located in the M-31 galaxy.  The purpose of these 
observations is to acquire STIS low-resolution ultraviolet spectra of early 
B-supergiants in galaxies M31 and M33 to determine the terminal velocities 
of their stellar winds.  The observations were completed as planned, and no 
anomalies were reported.

    1.16 Completed Three Sets of 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.

    1.17 Completed WF/PC-2 8632 (A UV Atlas of Nearby Galaxies)

        The WF/PC-2 was used to perform a snapshot survey of local galaxies 
at UV wavelengths with the F300W filter.  The aim of the project is to 
build a reference UV Atlas of normal galaxies, whose optical images are 
well known, with the highest possible degree of information, covering all 
the morphological types and luminosity classes.  The proposal completed 
normally.

   1.18 Completed Two Sets of 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.

    1.19 Completed Two Sets of 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.

    1.20 Completed WF/PC-2 8716 (Search For Sub-Stellar Companions To Young 
Brown Dwarfs In The Chamaeleon I Dark Cloud)

        The WF/PC-2 was used to observe twelve very low-mass dwarfs in the 
Chamaeleon I dark cloud, a site of on-going star formation, all showing 
H-alpha emission with spectral types from M6 to M8.  We propose to observe 
these young, very low-mass dwarfs in order to search for close, faint 
companions.  There were no reported problems.

    1.21 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 which is 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.

    1.22 Completed WF/PC-2 8346 (Cosmological Parameters from Type Ia 
Supernovae at High Redshift)

        The WF/PC-2 was used to directly measure the cosmological 
parameters, Omega, Lambda, and thus the curvature, Omega_k, using Type Ia 
supernovae {SNe Ia} as calibrated standard candles.  Observations of SNe Ia 
spanning a large redshift range are key to decoupling Omega and 
Lambda.  The observations completed nominally.

    1.23 Completed STIS/CCD 8236 (Black Holes and Gas Disks in a Complete 
Sample of Radio-Loud Ellipticals - II: Kinematics)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the radio-loud elliptical galaxy NGC-5127.  From these 
observations we will measure the black hole masses, determine the nature, 
kinematics, and structure of the central gas disks and obtain a modeled 
upper limit to their mass accretion rates.  A wavelength calibration image 
was also taken.  The observations were completed as planned, and no 
problems were reported

    1.24 Completed Two 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.

    1.25 Completed STIS/CCD 8664 (Structural Measurement of Globular 
Clusters in M31 and NGC 5128: Stalking the Fundamental Plane)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
in the snapshot mode to image a wide selection of individual globular 
clusters in two other large galaxies {M31 and NGC 5128} for measurement of 
their structural parameters {r_c, c, central surface brightness}.  We will 
use these to compute their binding energies and define the FP in these two 
galaxies. Comparison with the Milky Way will then give us powerful new 
information on just how ``universal'' the cluster formation process was in 
the early protogalaxies.  The observations completed with no reported problems.

    1.26 Completed STIS/CCD 8647 (Black Hole Accretion Outbursts In Soft X- 
Ray Transients)

        The Space Telescope Imaging Spectrograph (CCD) was used to make UV 
observations of soft X-ray transient {SXT} XTE-J1118. This is part of an 
extensive multiwavelength target of opportunity campaign to monitor newly 
discovered SXTs in outburst and throughout the subsequent decline.  Recent 
work establishes that a high proportion of SXTs harbor black holes, so 
these observations provide an unrivalled opportunity to obtain high quality 
data from an accreting black hole.  UV data is a keystone of this 
multiwavelength campaign because the disk regions of interest radiate 
predominantly in the UV.  Emission lines will give the ability to probe the 
kinematics of the inner disk region.  The relative strengths of the 
reprocessed X-ray flux emitted in the UV will be examined, and the UV flux 
generated by viscous heating in the accretion flow.  Multiwavelength 
observations will probe the physics of the accretion flow throughout the 
outburst.  The observations will yield detailed quantitative tests of the 
models for SXT outbursts.  The new STIS/MAMA capability to perform UV 
spectroscopy with 125 microsecond time resolution will be exploited.  A 
proven HST/RXTE echo-mapping experiment will measure the size of the 
reprocessing regions in the accretion disk, and thus probe morphology 
changes as the decline proceeds.  It is unknown what rapid UV variability 
may be found.  Recent RXTE discoveries suggest this may prove a rich source 
of information on the dynamics close to the event horizon.  The 
observations completed with no reported problems.

    1.27 Completed WF/PC-2 8134 (Is the IMF Universal at Low Stellar Masses?)

        The WF/PC-2 was used to make observations of the cluster 
NGC-1984.  Only the HST can provide the resolution and limiting magnitude 
required to reach the low-mass end of the IMF at extragalactic 
distances.  The observations were executed as scheduled, and no problems 
were reported.

    1.28 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.

    1.29 Completed FGS 8618 (Parallaxes of Magnetic CVs)

        The FGSs were used to gather data for the calculation of 
trigonometric parallaxes of cataclysmic variable {CVs} which are needed to 
obtain reliable information on luminosities, accretion rates, and on radii 
and masses of the stellar components.  They are also needed to derive the 
space density, an important ingredient for theories of CV evolution.  The 
observations completed with no reported problems.

    1.30 Completed FGS 8334 (HD 98800: An Opportunity to Measure True 
Masses for Low-Mass PMS Stars)

        The Fine Guidance Sensors were used to make astrometric 
observations of the low mass pre-main sequence (PMS) star HD98800 in order 
to measure its true mass.  HD 98800 became interesting when IRAS found it 
to have a large infrared excess, indicating a substantial dust disk.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.31 Completed STIS/CCD 8840 (Read Noise Monitor)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
the read noise of all the amplifiers on the STIS CCD using pairs of bias 
frames.  Full frame and binned observations are made inboth Gain 1 and Gain 
4, with binning factors of 1 x 1, 1 x 2, 2 x 1 and 2 x 2.  All exposures 
are internals.  The observations completed with no reported problems.

    1.32 Completed STIS/CCD 8870 (POMS Test Proposal: STIS Non-Scripted 
Parallel Proposal Continuation IV)

        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.

    1.33 Completed STIS/CCD/MA1/MA2 8244 (Probing Stellar Ejecta in SN 1006 
through UV Absorption Spectroscopy)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to investigate the remnant of SN 1006 which provides a unique 
opportunity to study ejecta from a Type Ia supernova through UV absorption 
spectroscopy.  Absorption lines in the spectrum of the background 
Schweizer-Middleditch star have revealed the presence of cold Fe and Si 
with velocities up to 7000kms.  These lines surely are due to ejecta, but 
extrapolation from a single line of sight to the entire remnant suggests a 
mass of Fe less than half the ~ 0.5: Msun expected from a Type Ia 
supernova.  A reliable inventory of the ejecta requires several such ``core 
samples'' through the remnant, but until now no other suitable background 
UV sources had been identified.  The observations completed nominally.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 32
Successful: 32

  Scheduled Re-acquisitions: 18
Successful: 18

    2.2 FHST Updates:
Scheduled: 73
Successful: 72

        The update at 191/125615Z failed.

    2.3 Operations Notes:

        Operations is being conducted on CCS string "A".  A re-cycle was 
performed at 190/0758Z due to required repairs on the Veda_1 disk.  The 
Veda_1 problem occurred again and was previously reported in HSTAR 7710 on 
day 189.

        The EDAC error counter was cleared five times per ROP SR-1A.

        The engineering status buffer limits were managed two times per ROP 
DF-18A.

        Using ROP NS-5, SI C&DH errors were reset at 192/0501Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW