HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2446

PERIOD COVERED:  0000Z (UTC) 08/27/99 - 0000Z (UTC) 08/30/99

Daily Status Report as of 242/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Six Sets of STIS/CCD 8408 (STIS CCD Dark Monitor C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation.  This is to monitor the darks for the STIS CCD. 
The observations were executed as scheduled, and no anomalies were reported.  

   1.2 Completed FGS 8292 (Calibrating the Mass-Luminosity Relation at the End
of the Main Sequence)

       The Fine Guidance Sensor (FGS1R) was used to make astrometric
observations of the star GL234 and other nearby reference stars.  This is part
of a study to calibrate the mass-luminosity relation for stars less massive
than 0.2 Msun, with special emphasis on objects near the stellar/brown dwarf
border.  The observations were completed as planned, and no problems were
reported.  

   1.3 Completed Eight Sets of WF/PC-2 8443 (WF/PC-2 Cycle-8 Supplemental Darks
pt1/3)

       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.  As
described in the previous report and HSTAR 7238, the guide star acquisition for
the third iteration of this proposal failed and the take data flag remained
down.  Otherwise, the observations were completed as planned, and no further
problems were reported.  

   1.4 Completed Three Sets of STIS/CCD 8409 (STIS CCD Bias Monitor C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation.  This is 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 to track the evolution of hot columns.  The observations were
executed as scheduled, and no anomalies were reported.  

   1.5 Completed Four Sets of STIS/CCD 8202 (Bright Quasar Close Lensing
Search)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of HCLQ0517-3, HCLQ0304-0, HCLQ0228-1 and HCLQ0146-3 as part of a
second generation survey to search for bright lensing quasars.  With the
restored PSF, new images will be considerably more sensitive to the presence of
both close separation and faint lens components, and because STIS reaches two
magnitudes fainter the PC, the new snapshot images will have much greater
dynamic range.  As described in the previous report and HSTAR 7238, the guide
star acquisition for the first iteration of this proposal failed and the take
data flag remained down, affecting two observations.  Otherwise, the
observations were executed as scheduled, and no further anomalies were noted.  

   1.6 Completed STIS/CCD 8169 (HST-Galileo Io Campaign)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of an eclipse of Jupiter’s moon Io.  Io plays a central role in
the Jovian system, yet the mechanisms that couple its volcanoes, the tenuous
atmosphere, the escaping corona and the plasma torus remain elusive.  In 1999
there is the unique opportunity to combine HST observations with the Galileo
close flybys of Io.  The observations were completed as planned, and no
problems were reported.  

   1.7 Completed WF/PC-2 8453 (Cycle 8 Polarization)

       The WF/PC-2 was used to make observations of the standard source star
BD+64D106 in order to verify the stability of the instrument’s polarization
calibration.  The observations were completed as planned, and no problems were
reported.  

   1.8 Completed STIS/MA1/MA2 8144 (UV Spectroscopic Snapshots of FUSE AGN
Targets)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used to
make far ultraviolet spectrographic snapshot observations of the FUSE AGN
target PG2349-014.  This object is currently scheduled to be observed by the
Far Ultraviolet Spectroscopic Explorer {FUSE}.  The observations were executed
as scheduled, and no anomalies were noted.  

   1.9 Completed WF/PC-2 6631 (Imaging a Cluster of Galaxies at Redshift 2.38)

       The WF/PC-2 was used to make observations of the galactic cluster
Gal-Clus-2073 which is located at a distance of z = 2.38.  This is a sub-set of
about four galaxies within the cluster that forms a very compact {< 100 kpc}
galaxy group and may be merging to form a giant elliptical galaxy.  The
observations were executed as scheduled, and no anomalies were noted.  

   1.10 Completed Two Sets of STIS/CCD 8470 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations as part of a POMS proposal.  This is a STIS non-scripted parallel
Condition VI proposal.  The observations were completed as scheduled, and no
anomalies were reported.  

   1.11 Completed Seven Sets of STIS/CCD 8406 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations as part of a POMS proposal.  This is a STIS non-scripted parallel
Condition V proposal.  The observations were completed as scheduled, and no
anomalies were reported.  

   1.12 Completed Three Sets of WF/PC-2 8457 (UV Earthflats)

       The WF/PC-2 was used to make a ultraviolet Earth flat calibration
image.  This is to improve the quality of pipeline the ultraviolet flatfields. 
The observations were completed as scheduled, and no problems were reported.  

   1.13 Completed STIS/CCD 8172 (STIS Deep DLA Imaging Survey II)

       The Space Telescope Imaging Spectrograph (CCD) was used to make deep
observations of quasar/alpha galaxy Q2116-358.  The HST imaging, together with
ground-based spectroscopy, will unify absorption-line studies and faint galaxy
imaging studies, providing a comprehensive picture of the history of assembly,
star formation, gas consumption, and chemical enrichment in the Damped
Lyman-Alpha galaxies.  The observations were executed as scheduled, and no
anomalies were noted.  

   1.14 Completed Three 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.  

   1.15 Completed WF/PC-2/STIS/CCD 7496 (Star Formation Histories of Dwarf
Irregular Galaxies II: the Old Populations of IC 1613 and Sextans A)

       The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were used
to make observations of the dwarf irregular galaxy IC16135.  Recent results
from the ground and from HST for different types of dwarf galaxies show that
even in these apparently simple stellar systems, a variety of different star
formation histories can be found.  The observations were executed as scheduled,
and no anomalies were noted.  

   1.16 Completed STIS/CCD 7444 (Global Mapping of Molecular Oxygen on
Ganymede)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of Jupiter’s largest moon Ganymede in order to map its molecular
oxygen.  This is to study the absorption bands in the spectrum of Ganymede's
trailing hemisphere that result from the presence of condensed molecular oxygen
trapped on the surface.  This is probably resulting from the bombardment of
water ice by the Jovian magnetospheric ions.  The observations were completed
as planned, and no anomalies were reported.  

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

       The WF/PC-2 was used to make observations of the star REJ1925-56 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.  

   1.18 Completed STIS/CCD/MA1/MA2 7744 (Fundamental Properties of a DA-dm
Detached Eclipsing Binary)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used to
make observations of the DA-dm class detached binary star system EC13471-12.  A
wavelength calibration observations was also taken.  The observations were
executed as scheduled, and no anomalies were noted.  

   1.19 Completed Two Sets of WF/PC-2 8436 (POMS Test Proposal: WFII Backup
Parallel Archive Proposal II)

       The WF/PC-2 was used to make archive observations parallel to the prime
science observations as part of a POMS test proposal.  This is a POMS test
proposal designed to simulate scientific plans.  The observations were
completed as planned, and no anomalies were reported. 

   1.20 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 KK089.  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  

   1.21 Completed STIS/CCD/MA1 8287 (A Search For Transparent Lines of Sight
With Intergalactic He-II Absorption Towards 26 Bright z > 2.9 Quasars)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
He-II absorption line observations of quasar HE2215-62.  The aim is to identify
more suitable bright objects for detailed studies of intergalactic He-II
absorption at a redshift of Z <2.9 and >3.2 .  A wavelength calibration
observation was also taken.  The observations were executed as scheduled, and
no anomalies were noted.  

   1.22 Completed STIS/CCD/MA2 8218 (Exploring Triton in the Act of Global
Change)

       The Space Telescope Imaging Spectrograph (CCD and MA2) was used to make
ultraviolet observations of the moon Triton.  Triton appears to be undergoing
the start of a long-awaited, and perhaps fundamental, global seasonal change. 
The HST is required for this work owing to Triton's small {0.13"} apparent
diameter and the need for ultraviolet observations.  The observations were
completed as planned, and no problems were reported.  

   1.23 Completed WF/PC-2 6752 (Global Mapping of the Opposition Surge on the
Galilean Satellites)
>
       The WF/PC-2 was used to make observations of Jupiter’s moons Ganymede,
Io, Europa and Callisto.  This is to construct ~200 km resolution global maps
of the opposition brightness surge for each of the four Galilean satellites to
support and complement Galileo mission science investigations.  The
observations were executed as scheduled, and no anomalies were noted.  

   1.24 Completed WF/PC-2 8131 (HST Imaging of Moderate Redshift X-ray Emitting
Groups of Galaxies)

       The WF/PC-2 was used to make observations of the infrared and x-ray
emitting galactic cluster Gal-Clus-0723.  Most galaxies in the universe,
including our own Milky Way, are members of poor groups of galaxies.  Recent
optical and X- ray observations of nearby groups have revealed considerable new
insight into these important systems.  The observations were completed as
scheduled, and no problems were reported.  

   1.25 Completed STIS/CCD/MA1/MA2 8540 (STIS UV Spectroscopy of the Bright
Galactic Nova Velorum 1999)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used to
make ultraviolet spectrographic observations of the bright galactic
Nove-Velorum-1999.  Nova Velorum 1999 {V382 Vel}, discovered on 1999 May 22, is
the ninth brightest classical nova in recorded history, and probably the
brightest nova that will occur during the HST mission.  A wave length
calibration image was also taken.  The observations were executed as scheduled,
and no anomalies were noted.  

   1.26 Completed STIS/CCD 8189 (The Source of Gamma Ray Bursts and the Nature
of their Hosts)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
resolution optical and ultraviolet observations of the Gamma Ray Burster (GRB)
990712 and its host galaxy.  This comprehensive set of observations will
provide new insights into the astrophysics of GRBs and their high redshift host
galaxies.  The observations were completed as planned, and no problems were
reported. 

   1.27 Completed 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 PK350+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.  

   1.28 Completed WF/PC-2 7466 (From Globular Clusters to Tidal Dwarfs:
Structure Formation in Tidal Tails.)

       The WF/PC-2 was used to make observations of the globular clusters (et
al.) within the tidal tail of galactic merger NGC-7252.  By modeling these
systems with N-body hydrodynamic codes, can we identify the physical
circumstances and formation histories which can produce tidal dwarfs, star
clusters, and other structures in tidal tails.  The observations were completed
as planned, and no anomalies were reported.  

   1.29 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-2723.  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.  

   1.30 Completed FGS 7484 (The Masses of the O-type Binary 15 Monocerotis)

       The Fine Guidance Sensors (FGSs) was used to make astrometric
observations of O-type class, binary system star HD47839.  This binary system
was recently discovered to be a speckle and spectroscopic binary with an
orbital period of 23.6 years.  The observations were completed as scheduled,
and no problems were reported.  

   1.31 Completed WF/PC-2 8338 (The Evolution of the Host Galaxies of Powerful
Radio Sources)

       The WF/PC-2 was used to make observations of the host galaxy of the
powerful radio source known as MRC0015-22.  A combined data set of radio
galaxies and quasars will allow powerful tests of the relationship between
radio galaxies and quasars and the evolution of the host galaxies of powerful
radio sources over a wide range of look-back times.  The observations were
executed as scheduled, and no anomalies were noted.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions: 28
                                        Successful: 28

                         Scheduled Re-acquisitions: 23
                                        Successful: 23

   2.2 FHST Updates: 

                              Scheduled: 61
                             Successful: 61

   2.3 Operations Notes: 

       The Flight operations team returned to the STOCC area at 238/1300Z.  CCS
“A” string was configured for real-time; CCS “G” string, for back-up.

       The SSR EDAC error counter was cleared seven times, per ROP SR-1.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH