HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2416

PERIOD COVERED:  0000Z (UTC) 07/16/99 - 0000Z (UTC) 07/19/99

Daily Status Report as of 200/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Seven 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.  

   1.2 Completed WF/PC-2 8053 (WF/PC-2 Cycle-7 Earth Flats -- Part II)

       The WF/PC-2 was used to take Earth flat calibration images.  This
proposal obtains sequences of Earth streak flats to construct high quality flat
fields for the WF/PC-2 filter set.  The observations were executed as
scheduled, and no anomalies were noted.  

   1.3 Completed Four 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.  

   1.4 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.  

   1.5 Completed WF/PC-2 6512 (The Formation of the Galaxy: Completing the Age
Profile of the Outer Halo Globular Clusters)

       The WF/PC-2 was used to make observations to measure the age of globular
cluster PAL121A which is located in the distant outer halo to the Milky Way. 
Comparison of its age with those of clusters in the inner halo and bulge will
be a major component of reconstructing the early galactic formation history
throughout the entire halo.  The observations were executed as scheduled, and
no anomalies were noted.  

   1.6 Completed Eleven 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.  

   1.7 Completed Three 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.  

   1.8 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.  

   1.9 Completed WF/PC-2 8085 (Imaging of High Redshift Starburst Galaxies in
the Light of Lyman-Alpha)

       The WF/PC-2 was used to make Lyman-Alpha wavelength observations of the
high redshifted starbursting galaxy Q2038-012.  The observations were completed
as planned, and no anomalies were reported.  

   1.10 Completed Two Sets of STIS/CCD 8080 (STIS Spectroscopic CCD
Flatfielding -- Revised)

       The Space Telescope Imaging Spectrograph (CCD) was used to make CCD flat
fielding calibration observations in the spectroscopic mode.  The observations
were completed as planned, and no anomalies were reported.   

   1.11 Completed Two Sets of STIS/MA1 7345 (Origin and Physical Conditions in
the Local Lyman-Alpha Forest)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of TON-S180 and TON-1542 in order to study the origin and physical
conditions in the local Lyman-Alpha forest.  A wavelength calibration image was
also taken.  The observations were executed as scheduled, and no anomalies were
noted.  

   1.12 Completed FOC/96 7923 (FOC F/96 Turnon)

       The Faint Object Camera (f/96) was used to take an internal flat and a
dark to ensure that the 30-day limit for the FOC is not exceeded.  The
observations were executed as scheduled, and no anomalies were noted.  

   1.13 Completed S/C 5582 (FOC/48 Monthly Activation (Camera Section Only):
Cycle 4) 

        This proposal was executed as scheduled, and no anomalies were noted. 

   1.14 Completed Two Sets of STIS/CCD/MA1 8241 (A Snapshot Survey of
Interstellar Absorption Lines)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
high resolution Echelle spectrographic observations of the standard ultraviolet
stars HD185418 and HD201345 as part of a snapshot survey of interstellar
absorption lines.  A wavelength calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.  

   1.15 Completed Two Sets of STIS/MA1 8426 (Cycle 8 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA1) was used to make a
routine Cycle-8 MAMA dark noise calibration measurement.  This proposal will
provide the primary means of checking on the health of the MAMA detectors. 
This is done through frequent monitoring of the background count rate.  The
observations were completed as planned, and no problems were reported.  

   1.16 Completed WF/PC-2 8310 (White Dwarf Distances to Globular Clusters and
the RR-Lyrae Luminosity Calibration  M-5.)

       The WF/PC-2 was used to make observations of NGC-5904 (a.k.a., M-5) in
order to study its white dwarf and RR-Lyrae class starts.  Despite the efforts
of Hipparcos, the RR-Lyrae absolute magnitude calibration, M_V{RR}, remains
uncertain at a level which critically compromises these stars' use as standard
candles.  The observations were executed as scheduled, and no anomalies were
noted.  

   1.17 Completed WF/PC-2 6633 (Cusps or Cores in Barred Bulges?)

       The WF/PC-2 was used to make observations of the SB class (Barred)
galaxy NGC-7098 in order to study its nuclear bulge region and cusps.  This is
a highly tri-axial, tumbling, low-mass stellar systems.  The observations were
completed as planned, and no problems were reported. 

   1.18 Completed Four Sets of WF/PC-2 8515 (WF/PC-2 Ore-SM3A UV Baseline
Observations)

       The WF/PC-2 was used to make far-ultraviolet observations of the CVZ
targets 0047-524, 0214+586, 2039-682 and 0710+741 as part of the WF/PC-2
pre-SM3A UV baseline calibration observations.  The observations were completed
as planned, and no problems were reported.  

   1.19 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 PK016-01D1 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.  

   1.20 Completed STIS/MA2 7359 (Chemical Abundances in QSO Broad Absorption
Line Regions)

       The Space Telescope Imaging Spectrograph (MA2) was used to make
observations of the quasar CT344 in order to study the chemical abundances in
the QSO’s broad absorption line regions.  These observations are designed to
test the possible models for high metallicity in BALQSOs and, indirectly, test
the origins of the BAL phenomenon.  A wavelength calibration image was also
taken.  The observations were completed as planned, and no anomalies were
reported.  

   1.21 Completed WF/PC-2 6555 (What Causes the Astigmatism in Gravitational
Lenses?)

       The WF/PC-2 was used to make observations of the gravitationally lensed
quasar system PG1115+080 in order to study why these systems produce astigmatic
gravitational lenses.  Among multiply imaged quasars, those for which the shape
of the lensing mass can be measured show surprisingly strong deviations from
circular symmetry (i.e., astigmatism in the gravitational lens).  The
observations were completed as planned, and no problems were reported. 

   1.22 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 Maffei-1.  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  

   1.23 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.  

   1.24 Completed WF/PC-2 8263 (Snapshots of Sub-mJy Starburst Galaxies)

       The WF/PC-2 was used to make observations of the starbursting galaxy
GAL-011225.  Some of the most ambitious and widely cited extragalactic
observations in recent years have been the constraints made on the star
formation history of the Universe.  The observations were completed as planned,
and no anomalies were reported.  

   1.25 Completed STIS/CCD 8226 (Discerning the Origins of Blue Stragglers:
Masses and Rotation Rates)

       The Space Telescope Imaging Spectrograph (CCD) was used to study the
blue stragglers in globular cluster NGC-6752.  Conventional wisdom holds that
the masses of Blue Straggler Stars in globular clusters are significantly
larger than the turnoff mass.  A wavelength calibration observation was also
taken.  The observations were executed as scheduled, and no anomalies were
noted.  

   1.26 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.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 22
                                        Successful : 22

                          Scheduled Reacquisitions : 25
                                        Successful : 25

   2.2 FHST Updates: 

                              Scheduled : 49
                             Successful : 49

   2.3 Operations Notes: 

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

       Per HSTAR 7196, the STIS EMC experienced a retry at 197/162507Z.  The
STIS flight software error counter was reset at 197/16228Z per ROP NS-12.

       At 198/101541Z, the STIS low voltage power supply CCD electronics box
flagged out-of-limits low, 4.375 V, for one 60-second telemetry sample.  The
lower limit is 4.4 V.  HSTAR 7197 was written.  As directed by ROP NS-5, the SI
C&DH error was reset at 198/1350Z.

       ESTR-2 was commanded to record at 199/2334Z to cover a data gap from
200/0003Z until 200/0006Z per ROP RD-4.

       The ground master image on PRS was updated at 200/0311Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH