HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2441

PERIOD COVERED:  0000Z (UTC) 08/20/99 - 0000Z (UTC) 08/23/99

Daily Status Report as of 235/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

   1.1 Completed WF/PC-2 8444 (WF/PC-2 CYCLE-8 Internal Monitor)

       The WF/PC-2 was used to make a bias, and an internal flat, observation
as part of a Cycle-8 monitoring program to monitor the health of the cameras. 
A variety of internal exposures are obtained in order to provide a monitor of
the integrity of the CCD camera electronics in both bays {gain 7 and gain 15},
a test for quantum efficiency in the CCDs, and a monitor for possible buildup
of contaminants on the CCD windows.  The observations were executed as
scheduled, and no anomalies were noted.  

   1.2 Completed Four 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.  

   1.3 Completed Four 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.  

   1.4 Completed Two Sets of 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 nebulae PK211-03D1 and PK002-04D12 in order to study their
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.  

   1.5 Completed Nine 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 low
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.  

   1.6 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.  

   1.7 Completed Five Sets of STIS/CCD 8202 (Bright Quasar Close Lensing
Search)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of HCLQ2216-0, HCLQ1421+2, HCLQ0131-2, HCLQ0332-4, HCLQ0216-3 and
HCLQ0111-3 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.  The observations were executed as scheduled, and
no anomalies were noted.  

   1.8 Completed Two Sets of STIS/CCD/MA2 7271 (Molecular Hydrogen in the
Damped Lyman-Alpha Absorber of Q1331+170)

       The Space Telescope Imaging Spectrograph (CCD and MA2) was used to make
observations of the molecular hydrogen in the damped Lyman-Alpha absorber of
Q1331+170.  The rare detection of C-I absorption in this system, along with
features in the IUE spectrum consistent with the expected H-2 spectrum, make
this the most promising redshift system for such a search.  A wavelength
calibration image was also taken.  The observations were executed as scheduled,
and no anomalies were noted.  

   1.9 Completed Nine 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 high 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.  

   1.10 Completed STIS/CCD/MA2 8225 (Absorption and Obscuration in Radio-Loud
Quasars)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
observations of the radio-loud quasar MRC1349-26.  The role of associated
absorption systems and dust obscuration close to the central engines of AGN is
not understood.   A wavelength calibration image was also taken.  The
observations were completed as planned, and no anomalies were reported.   

   1.11 Completed STIS/CCD 8313 (Imaging the Host Galaxies of High Redshift
Type Ia Supernovae)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of 98114 and its host galaxy.  The propose is to obtain snapshot,
unfiltered STIS images of distant galaxies of known redshift which have hosted
supernovae {SNe} of Type IA found via the Supernova Cosmology Project.  The
observations were completed as scheduled, and no anomalies were reported.  

   1.12 Completed 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. 

   1.13 Completed Four Sets of STIS/CCD/MA1 7315 (A Campaign to Determine the
CO and CO2 Abundances in Cometary Nuclei)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
observations of the Comet Lee to determine the CO and CO2 abundances in the
cometary nuclei.  This campaign began in Cycle 6, using the FOS to obtain
spectra of Comet Lee2, the latter in June 1996 when the comet was 0.94 AU from
the sun and 1.12 AU from Earth.  The observations were executed as scheduled,
and no anomalies were noted.  

   1.14 Completed WF/PC-2 7339 (Sizes and Structures of Faint Blue Compact
Galaxies that are New Candidates for Proto-Spheroidal Galaxies)

       The WF/PC-2 was used to obtain two-band WFPC-2 images of a unique sample
of the faint blue compact galaxy SA68-17169 at redshifts up to z ~ 0.7, that is
a excellent new candidate for being spheroidal galaxies, caught in the act of
undergoing a major star-forming event.  The observations completed with no
reported anomalies.

   1.15 Completed Four Sets of STIS/CCD 8271 (A Snapshot Survey of LMC
Planetary Nebulae: A Study of Nebular and Late Stellar Evolution)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
medium-resolution slitless spectroscopy snapshot images of the planetary
nebulae LMC-SMP-10, LMC-SMP-31, LMC-SMP-4 and LMC-SMP-19 located in the Large
Magellanic Cloud to study the parallel evolution of the nebulae and their
central stars.  The observations were completed as planned, and no problems
were reported.  

   1.16 Completed Two Sets of STIS/CCD/MA2 8342 (Abundances in Halo Stars and
Galactic Element Formation)

       The Space Telescope Imaging Spectrograph (MA1 and CCD) was used to make
observations of stars HD186478 and HD175305 as part of a study of the
abundances in halo stars and galactic element formation.  The results for the
very oldest galactic stars will also provide an important, and independent, age
determination for the Galaxy and hence constrain cosmological age estimates.  A
wavelength calibration image was also taken.  The observations were executed as
scheduled, and no anomalies were noted.  

   1.17 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 (GCs) 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.

   1.18 Completed WF/PC-2 7504 (Calibration of Nearby Type Ia Supernovae as
Standard Candles: The Next Three-Year Step)

       The WF/PC-2 was used to make observations of parent galaxy NGC-1316 in
order to determining its Cepheid distance.  This is to continue the calibration
of the Type 1a supernova as standard candles.  The observations were completed
as planned, and no problems were reported.  

   1.19 Completed Two Sets of 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.  

   1.20 Completed Two Sets of WF/PC-2 8134 (Is the IMF Universal at Low Stellar
Masses?)

       The WF/PC-2 was used to make observations of the clusters NGC-2156 and
NGC-1866.  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.  

   1.21 Completed FGS 8309 (A Link Between Massive Binary Stars and Non-thermal
Radio Emission)

       The Fine Guidance Sensors were used to make astrometric observations of
the massive Wolf-Rayet binary star WR14 and several nearby reference stars. 
Non-thermal radio emission in Wolf-Rayet stars is explained in terms of
synchrotron emission from shocks in the stellar wind.  The observations were
executed as scheduled, and no anomalies were noted.  

   1.22 Completed WF/PC-2 6461 (High-Resolution Next Bright Galactic Nova)

       The WF/PC-2 was used to make high resolution images of the bright
galactic nova U-Scorpio after it erupted to search for fluorescence and
reflection light echoes from, and small-scale structure in, the nova
circumstellar gas and dust ejecta.  The observations were executed as
scheduled, and no anomalies were noted.  

   1.23 Completed WF/PC-2 7495 (Survey of Gravitational Lenses as Cosmological
Tools)

       The WF/PC-2 was used to make survey observations of objects SBS1520+53
by obtaining deep, high-resolution images in the optical and near IR in order
to see if they are gravitationally lensed and could be used as a cosmological
tool.  The observations were executed as scheduled, and no anomalies were
noted.  

   1.24 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 IC1513.  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.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions: 32
                                        Successful: 32

                         Scheduled Re-acquisitions: 17
                                        Successful: 17

   2.2 FHST Updates: 

                              Scheduled: 76
                             Successful: 76

   2.3 Operations Notes: 

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

       The STIS MCE-1 reset at 232/040024Z while the low voltage was on while
in an SAA interval.  Per ROP MS-12, the STIS flight software error counter was
reset at 232/0445Z.  MAMA-1 was recovered via normal SMS commanding at the time
of a high voltage on sequence, 232/0654Z.

       The flight operations team transferred operations to the CCS “B” String
at 232/2147Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH