HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2442

PERIOD COVERED:  0000Z (UTC) 08/23/99 - 0000Z (UTC) 08/24/99

Daily Status Report as of 236/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

   1.1 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 nebulae IRAS21282, PK130-11D1 and PK352-07D1 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.  

   1.2 Completed Two Sets of STIS/CCD 8408 (STIS CCD Dark Monitor C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias and a dark 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 Six Sets of WF/PC-2 8442 (WF/PC-2 Cycle 8 Standard Darks)

       The WF/PC-2 was used to make a series of Cycle 8 standard dark
calibration observations.  This dark calibration program obtains dark frames
every week in order to provide data for the ongoing calibration of the CCD dark
current rate, and to monitor and characterize the evolution of hot pixels.  The
observations were executed as scheduled, and no anomalies were noted.  

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

       The WF/PC-2 was used to make observations of the star HD2133 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.  

   1.5 Completed Two Sets of STIS/CCD 8410 (STIS CCD Hot Pixel Annealing C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to assess the
effectiveness of the CCD hot pixel annealing process by measuring the dark
current behavior before and after annealing and by searching for any window
contamination effects.  In addition CTE performance is examined by looking for
traps in a low signal level flat.  The observations were completed as planned,
and no anomalies were reported.  

   1.6 Completed Three 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.  The
observations were completed as planned, and no problems were reported.  

   1.7 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 clusters (GCs) NGC 6388 and
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.

   1.8 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-0723.  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.  

   1.9 Completed Two Sets of 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 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.  

   1.11 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 KK003.  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  

   1.12 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 Ganyemede,
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.  

   1.13 Completed 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.  

   1.14 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 9568 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.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions: 13
                                        Successful: 13

                         Scheduled Re-acquisitions: 4
                                        Successful: 4

   2.2 FHST Updates: 

                              Scheduled: 24
                             Successful: 24

   2.3 Operations Notes: 

       The flight operations team began using the CCS “A” string at 235/1422Z. 
The team then transferred to the Building 23 back-up facility at 235/2000Z in
preparation for GSFC Internal Simulation #9 (Replanned EVA-4/Deploy) which will
be conducted all day today in the STOCC area.

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

       The STIS MCE-1 reset at 235/163016Z while the low voltage was on and
while in an SAA interval.  The STIS flight software error counter was reset at
235/1754Z in accordance with ROP NS-12.  MAMA-1 will be recovered at 237/0309Z
via normal SMS commanding at the time of the next high voltage on.

       A TTR was written for a 41-minute, 7-second loss of engineering data
starting at 236/0049Z due to a TDW problem.

       The NICMOS FPA temperature sensor for detector 2 was enabled at
266/0059Z; for detector 3, at 236/0154Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH