HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1911

PERIOD COVERED:  0000Z (UTC) 07/01/97 - 0000Z (UTC) 07/02/97

Daily Status Report as of 183/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed STIS/CCD 7659 (Daily Darks to Update Acquisition Bad Pixel
Table)

       The Space Telescope Imaging Spectrograph (CCD) was used to make dark
calibration images in order to update the acquisition bad pixel table.
Daily hot pixel lists can also be used for science data analysis.  The
observations were executed as scheduled, and no anomalies were noted.

   1.2 Completed NIC/1/2/3 7706 (NICMOS MULTIACCUM Dark Characterization 4/8)

       The purpose of this proposal is to obtain group 4 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7.  The observations completed with no reported problems.

   1.3 Completed WF/PC-2 7450 (The Formation of Bulges of Spiral Galaxies:
Central Visual-Infrared Color Gradients)

       The WF/PC-2 was used to make observations of the bulge in spiral
galaxy NGC-5326 in order to obtain high-resolution optical and near
infrared images for a complete survey sample of bulges of spiral galaxies.
The observations were completed as scheduled, and no anomalies were
reported.

   1.4 Completed Two Sets of STIS/CCD 7700 (STIS Non-Scripted Parallel
Archive Proposal)

       The Space Telescope Imaging Telescope (CCD) was used to obtain
slitless spectroscopy with the G750L grating to search for emission line
galaxies at intermediate to high redshift.  Field galaxy surveys have shown
that at high redshift most galaxies have strong emission lines, and are
compact and blue.  This suggests that star formation rates were higher than
at present,and that AGN may have been more frequent.  The low background
and high resolution of HST separates these objects from the background.
The proposal completed as planned, and no problems were reported.

   1.5 Completed Two Sets of WF/PC-2 6253 (Pure Parallel Archive Program)

       The WF/PC-2 was used to execute a pure parallel program taking
ultraviolet observations running concurrently with prime science
observations.  The intent is to search for extra-galactic sources with flux
excesses at 3000 A0 and galactic sources with excesses at 1600 A0.  The
observations were completed as planned, and no problems were reported.

   1.6 Completed Three Sets of NIC/1/2/3 7710 (NICMOS MULTIACCUM Dark
Characterization 8/8)

       The purpose of this proposal is to obtain group 8 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7.  The observations completed with no reported problems.

   1.7 Completed Four Sets of STIS/CCD 7312 (Investigating Volatile
Depletion in Two Periodic Comets: 2P/Encke and 103P/Hartley 2)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
images of the periodic comet Enckke (2P) to investigate its volatile
depletion.  Current theories predict that the near-surface regions of
cometary nuclei should become increasingly devolatilized during successive
passages through the inner solar system.  As reported in yesterday's report
and in HSTAR 6109, there was a guide star acquisition failure at 182/0624Z,
just before the second iteration of this proposal.  Otherwise, the
observations were executed as scheduled, and no further anomalies were
noted.

   1.8 Completed Two Sets of NIC/1/2/3 7709 (NICMOS MULTIACCUM Dark
Characterization 7/8)

       The purpose of this proposal is to obtain group 7 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7.  As reported in yesterday's report and in HSTAR 6109,
there was a guide star acquisition failure at 182/0901Z, just before the
second iteration of this proposal.  Otherwise, the observations completed
with no reported problems.

   1.9 Completed Two Sets of WF/PC-2 6905 (WF/PC-2 Cycle 6 Calibration:
Internal Monitor)

       The WF/PC-2 was used to make several internal calibrations
observations including biases and internal flats as part of a Cycle 6
calibrations procedure.  A variety of internal exposures are run weekly to
verify and monitor the health of the camera.  As reported in yesterday's
report and in HSTAR 6111, there was a guide star acquisition failure at
182/1035Z, just before the first iteration of this proposal.  Otherwise,
the observations were executed as scheduled, and no anomalies were noted.

   1.10 Completed NIC/2 7327 (Elliptical Galaxy Evolution at High Redshift:
IR Imaging of 60 Distant Clusters)

       The Near Infrared Camera (Camera Two) was used to make infrared
observations high redshifted elliptical galaxies in galactic clusters
CL1335+463 and CL1227+463.  By measuring the structural properties of high
redshift cluster elliptical galaxies, it is hoped to resolve the
controversy regarding the age and formation history of bright cluster
ellipticals.  The observations were executed as scheduled, and no anomalies
were noted.

   1.11 Completed STIS/CCD 7063 (STIS SMOV CCD Contamination Monitor)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of standard star GD153 in order to  measure flux and look for
any gross changes over time that might indicate contamination.  The
observations were completed as scheduled, and no anomalies were reported.

   1.12 Completed Two Sets of NIC/1/2/3 7701 (NICMOS Short One Orbit Parallel)

       The Near Infrared Camera (Cameras One, Two and Three) was used as
part of a short NICMOS one orbit parallel program, to obtain "JHK" imaging
of sky regions when another instrument is prime.  The observations were
completed as scheduled, and no anomalies were reported.

   1.13 Completed WF/PC-2 7202 (The WF/PC-2 B Band Parallel Survey: A
Systematic and Synoptic Study of Galaxy Formation and Evolution - Short
Orbit Case)

       The WF/PC-2 was used to make observations as part of a B-Band Survey
to make synoptic study of galaxy formation and evolution.  These
observations were taken in parallel with the prime science observations.
They were completed as planned, and no anomalies were reported.

   1.14 Completed Two Sets of NIC/1/2/3 7729 (NICMOS Short One Orbit Parallel)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
obtain "JHK" imaging of sky regions while another instrument was prime.
These observations were  part of the short NICMOS one orbit parallel
program.  The observations were executed as scheduled, and no anomalies
were noted.

   1.15 Completed NIC/2 7331 (Near-IR Properties of the Bulges of Spiral
Galaxies)

       The Near Infrared Camera (Camera Two) was used to make infrared
observations of the bulge in spiral galaxy NGC-3277.  Near-IR data at HST
resolution are essential for correcting for the effect of dust and will
enable us to derive robust nuclear properties for the sample.  The
observations were executed as scheduled, and no anomalies were noted.

   1.16 Completed FGS 6875 (Parallax of Delta Cephei)

       The Fine Guidance System was used to make astrometric observations
of the Cephied class variable star Delta Cephei.  Delta Cephei is a
classical Cepheid variable, whose trignometric parallax is presently known
to around 30%.  HST observation shave the potential to reduce this
uncertainty to 15%.  The observations were completed as planned, and no
anomalies were reported.

   1.17 Completed NIC/1/2/3 7676 (NICMOS-One Orbit Parallel)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
conduct an on-orbit calibration procedure.  This was none in parallel with
the prime science observations . The procedure was completed as scheduled,
and no anomalies were noted.

   1.18 Completed WF/PC-2 6776 (A Comparative HST Imaging Study of Radio
Galaxies and Hosts)

       A clear understanding of the nature of the host galaxies of
radio-quiet quasars, radio-loud quasars and radio galaxies is of central
importance in any attempt to unify and relate the three main classes of
powerful active galaxies.  Existing HST studies of quasar hosts, while
producing many interesting new results, have yielded surprisingly little
hard information on the properties of the hosts themselves.  This imaging
study using the WF/PC-2 of object OX169 will remedy this situation by
undertaking redder, line-free observations of our three matched AGN
samples.  The proposal completed with no reported problems.

   1.19 Completed STIS/CCD 7727 (STIS Non-Scripted Parallel Archive Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used to obtain
parallel slitless spectroscopy with the G750L grating to search for
emission line galaxies at intermediate to high redshift.  Field galaxy
surveys have shown that, at high redshift, most galaxies have strong
emission lines, and are compact and blue.  The observations were completed
as planned, and no anomalies were reported.

   1.20 Completed WF/PC-2 5946 (The Stellar Populations of Low Surface
Brightness Galaxies)

       The WF/PC-2 was used to make observations of the low surface
brightness galaxy UGC-12695.  The objective of this program is to study the
stellar population and evolution of this galaxy.  The observations were
completed as planned, and no anomalies were reported.

   1.21 Completed Two Sets of NIC/1/2/3 7726 (NICMOS One Orbit Parallel)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make one orbit parallel calibration observations.  The observations were
executed as scheduled, and no anomalies were noted.

   1.22 Completed STIS/CCD 7675 (STIS Non-Scripted Parallel Archive Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used in the
parallel mode to obtain slitless spectroscopy with the G750L grating to
search for emission line galaxies at intermediate to high redshift.  The
observations were completed as planned, and no anomalies were reported.

   1.23 Completed STIS/CCD 7088 (STIS CCD Coronograph Occulting Bar
Scattered Light)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the star HD60753 in order to study the scattered light
profile from the occulting bars available for STIS imaging (50CORON) and
spectroscopic apertures (52x0.2F1) using the CCD.  The observations were
completed as scheduled, and no anomalies were reported.




2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 8
                                        Successful : 8

                          Scheduled Reacquisitions : 7
                                        Successful : 7

   2.2 FHST Updates:

                              Scheduled : 11
                             Successful : 11

   2.3 Operations Notes:

       Three guide star acquisition failures, reported in Section 2.1 of
yesterday's report, are further described in 1.7, 1.8, and 1.9.

       As documented in HSTARs 6108 and 6110, there were two instances, at
182/064502Z and 182/083002Z, when the STOCC received notification that
there had been a timed SPC busy reject error flag.  Although there will be
further analysis, initial indications are that the events are linked to
guide star acquisiton failures occurring near the specified times.  In each
case, the STOCC send commands to clear the error flag.

       STIS EEPROM and EDAC memory dumps were performed at 182/1453Z.

       The STIS Bad Pixel Table was loaded at 182/1500Z.

       The SSR Interrupt Log was dumped at 183/0709Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science and SMOV operations.

/DMH