HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2450

PERIOD COVERED:  0000Z (UTC) 09/02/99 - 0000Z (UTC) 09/03/99

Daily Status Report as of 246/0000Z

OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

   1.1 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.  

   1.2 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.  

   1.3 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.  

   1.4 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 calibration observation.  This is to monitor the darks for the STIS CCD. 
The observations were executed as scheduled, and no anomalies were reported.  

   1.5 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.  

   1.6 Completed STIS/CCD 8415 (CCD Sparse-Field CTE External C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of NGC-346, a cluster associated with a nebula in Tucana.  This
program will allow the derivation of accurate coefficients that can be used to
correct low count level data {both imaging and spectroscopy} for
nonlinearity/CTE effects.  The observations were executed as scheduled, and no
anomalies were noted.  

   1.7 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.  

   1.8 Completed Two 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.  

   1.9 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 Q2206-1958.  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.  

   1.10 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.  

   1.11 Completed WF/PC-2 8099 (Imaging the Circumstellar Environments of the
Cool Hypergiants)

       The WF/PC-2 was used to make observations of the curcumstellar
environment around the cool, hypergiant, variable star VX-Sgr.  The cool
hypergiants are evolved massive stars that lie just below the empirical upper
luminosity boundary in the HR Diagram.  The observations were completed as
planned, and no problems were reported.  

   1.12 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.  

   1.13 Completed 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 nebula
LMC-J-41 that is located in the Large Magellanic Cloud to study the parallel
evolution of the nebula and its central star.  The observations were completed
as planned, and no problems were reported.  

   1.14 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.

   1.15 Completed WF/PC-2/STIS/MA2 7410 (Deep UV Imaging of the Hubble Deep
Field)

       The WF/PC-2 was used to make ultraviolet observations of Hubble Deep
Field HDF-STIS-P.  The observations will extend the searches for Lyman break
galaxies to B~ 29, two magnitudes fainter than possible with the existing HDF
data and more than four magnitudes fainter than the current limit of
ground-based spectroscopy.  The observations were executed as scheduled, and no
anomalies were reported.  

   1.16 Completed 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.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions: 7
                                        Successful: 6

       Per HSTAR 7244, the acquisition scheduled for 246/0907Z failed.  Four
proposals (WF/PC-2 7266, STIS/CCD 8409, STIS/CCD 8470, and STIS/CCD 8406), all
appearing during the period of the next report, were affected. 

                         Scheduled Re-acquisitions: 7
                                        Successful: 7

   2.2 FHST Updates: 

                              Scheduled: 17
                             Successful: 17

   2.3 Operations Notes: 

       HST operations remains on CCS “A” string

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

       In accordance with ROP PO-8, a fine attitude determination was performed
at 245/1356Z.

       The SSR engineering dump at 245/1620Z was only partially collected at
the TTAC, due to a possible TTAC collection limit problem.  Line outage
recorder playbacks have been scheduled to recover the data.

       ROP NS-3 was utilized at 245/1631Z to execute an NSSC-1 status buffer
dump.

       A TTR was written for a data drop-out at 246/0900Z.  The data is
recoverable.

       The SSR pointers were set at 246/0900Z, per ROP SR-3.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH