HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2367

PERIOD COVERED:  0000Z (UTC) 05/06/99 - 0000Z (UTC) 05/07/99

Daily Status Report as of 127/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Two Sets of STIS/CCD 7949 (CCD Dark and Bias Monitor --
Cont. to June 99)

       The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
CCD dark calibration and a bias monitoring program.  It was also scheduled
to track the growth of hot pixels on the CCD in general and within the
various target acquisition apertures specifically.  The observations were
executed as scheduled, and no anomalies were noted.

   1.2 Completed Three Sets of WF/PC-2 7713 (WF/P-2 Cycle 7 Supplemental
Darks pt3/3)

       The WF/PC-2 was used to make supplemental dark calibration images.
This dark calibration program obtains 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 anomalies were noted.

   1.3 Completed Four Sets of STIS/CCD 8393 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation IV)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
POMS, non-scripted, low galactic latitude observations made in parallel
with the prime science observations.  During the final iteration of this
proposal, the late re-acquisition described in 2.1 and HSTAR 7121 occurred,
possibly affecting one observation.  Otherwise, the observations were
executed as scheduled, and no further anomalies were noted.

   1.4 Completed 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.

   1.5 Completed WF/PC-2 7622 (WF/PC-2 Cycle 7 Internal Monitor)

       The WF/PC-2 was used to make a set of Cycle 7 internal monitoring
calibration measurements.  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.  A bias calibration and an internal flat calibration image were
also taken.  The observations were executed as scheduled, and no anomalies
were noted.

   1.6 Completed WF/PC-2 6347 (A Search for Jets in Planetary Nebulae)

       The WF/PC-2 was used to make observations of the planetary nebulae
(class PNe) IC4593 in order to search for the presence of possible narrow
jets.  The current model for PNe formation indicates that jets are an
unexpected phenomena, yet there is a growing body of circumstantial
evidence that suggests narrow jets are common feature in PNe.  The
observations were completed as scheduled, and no anomalies were noted.

   1.7 Completed WF/PC-2 6346 (Snapshot Survey of the Ultraluminous IRAS
Galaxy Sample-Part 1 High)

       The WF/PC-2 was used to make snapshot survey observations of the
ultraluminous IRAS galaxy CL-ULIR004.  These data will be searched for
multiple cores, which imply a merger has occurred, and for starburst
regions.  The observations were executed as scheduled, and no anomalies
were noted.

   1.8 Completed WF/PC-2 6363 (The Environments and Host Galaxies of BL-Lac
Objects)

       The WF/PC-2 was used to make snapshot survey observations of BL-Lac
objects MRK501 in order to study their environment and their host galaxies.
The goal is to investigate systematic trends in host galaxy type, unusual
morphological features, nearby companion galaxies, etc.  The observations
were executed as scheduled, and no anomalies were noted.

   1.9 Completed STIS/CCD/MA1 7295 (Galaxy Rotation Curves at Large Radius
using Lyman-alpha Absorption Lines)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make rotational spectrographic observations of the galaxy Q1246-057.  This
is to investigate the outer rotation curves of eight spiral galaxies at
very large galactocentric radii by using the kinematical information from
Lyman-alpha absorption lines in the spectra of background quasars.  The
observations were executed as scheduled, and no problems were reported.

   1.10 Completed Two 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 8152 (Mineralogy and Weathering History of Mars)

       The WF/PC-2 was used to make high spatial resolution and moderate
spectral resolution 5500 Angstrom to 10,000 Angstrom STIS long-slit imaging
spectroscopy observations of the planet Mars.  This is to identify and
globally map the planet's iron-bearing surface mineralogy.  The
observations were executed as scheduled, and no anomalies were noted.

   1.12 Completed WF/PC-2 6355 (A UV Atlas of Nearby Galaxies)

       The WF/PC-2 was to be used to make ultraviolet observations of the
nearby galaxy IC5152.  The aim of the project is to build a reference
ultraviolet atlas of galaxies whose optical images are well known, with the
highest possible degree of information, covering all the morphological
types and luminosity classes.  As noted in 2.1 and HSTAR 7120, the
acquisition for this proposal failed, affecting two observations.

   1.13 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.

   1.14 Completed STIS/CCD 7480 (The Changing Wind Structure of the
Erupting SMC WN/LBV System HD5980)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the changing wind structure in the erupting SMC, Wolf-Rayet
WN/LBV, binary star HD5980.  This is perhaps similar to the Great Eruption
in Eta Carinae.  The observations were executed as scheduled, and no
anomalies were noted.

   1.15 Completed WF/PC-2 8059 (POMS Test Proposal: WF-2 Targeted Parallel
Archive Proposal)

       The WF/PC-2 was used to make observations in parallel with the prime
science observations.  The parallel opportunities available with WF/PC-2 in
the neighborhood of bright galaxies are treated in a slightly different way
from the normal pure parallels.  Local group galaxies offer the opportunity
for a closer look at young stellar populations.  The observations were
completed as planned, and no anomalies were reported.

   1.16 Completed WF/PC-2 6356 (SNAPSHOT Survey of Ultraluminous Infrared
Galaxies)

       The WF/PC-2 was used to make observations of galaxy Gal-025844 as
part of a survey of ultraluminous infrared galaxies.  The nature of
ultraluminous infrared galaxies has generated considerable controversy.
The two main issues are: {1} are they powered by violent bursts of star
formation or by hidden quasars?  {2} are interactions and mergers
invariably involved?  The observations were executed as scheduled, and no
anomalies were noted.

   1.17 Completed WF/PC-2 7279 (The Impact of Cluster Substructure on
Galaxies: A Case Study in ABELL 2125)

       The WF/PC-2 was used to make observations of the Abell-2125 galactic
cluster (a.k.a., the Butcher-Oemler Cluster) in order to study the impact
of the substructure of the cluster on galaxies.  The VLA data show that, as
well as a large blue-galaxy fraction {0.19} for its redshift, it has an
unprecedented number of radio galaxies {30 with confirmed redshifts},
evenly split between old stellar populations and starbursting galaxies.
The observations were executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 9
                                        Successful : 8

       Per HSTAR 7120, the acquisition at 126/171000Z failed when the
search radius was exceeded.  The proposal described in 1.12 was affected.

       The re-acquisition at 126/231334Z failed three times due to a large
FGS-1 attitude error vector before succeeding at 126/232105Z.  HSTAR 7121
was written.  The proposal outlined in 1.3 may have been affected.

       An acquisition at 127/011813Z failed to fine lock back-up on FGS-3
only.  Two proposals, occurring during the period of the next report
(WF/PC-2 7279 and STIS 8393) may have been affected.  HSTAR 7122 was
written.

       Another acquisition, at 127/065307Z also defaulted to fine lock
backup on FGS-3 only when the search radius limit was exceeded.  HSTAR 7124
was written.  A proposal, STIS 8152, occurring during the period of the
next report, may have been affected.

                          Scheduled Reacquisitions : 6
                                        Successful : 6

   2.2 FHST Updates:

                              Scheduled : 16
                             Successful : 16

   2.3 Operations Notes:

       The operations team continues to function in the SAMS back-up
facility using the PRS ground system.

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

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH