HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2394

PERIOD COVERED:  0000Z (UTC) 06/15/99 - 0000Z (UTC) 06/16/99

Daily Status Report as of 167/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed 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 Two Sets of WF/PC-2 7712 (WF/PC-2 Cycle 7 Supplemental
Darks pt2/3)

       The WF/PC-2 was used to make a series of Cycle 7 supplemental
calibration darks.  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 executed as scheduled, and no
anomalies were noted.

   1.3 Completed Five 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.

   1.4 Completed WF/PC-2 7431 (Snapshot Survey of Microlensed Source Stars)

       The WF/PC-2 was used to make snapshot survey images of microlensed
source star MACHO-95-1.  Gravitational microlensing surveys have revealed
an excess of lensing events over theoretical predictions toward both the
Large Magellanic Cloud and the Galactic Bulge.  The observations were
completed as planned, and no anomalies were reported.

   1.5 Completed WF/PC-2 6967 (Blue Continuum Snapshots of 3CR Radio -
Continued Galaxies)

       The WF/PC-2 was used to make observations of the radio galaxy
3C63.0.  Radio galaxies are an important class of extragalactic objects:
they represent one of the most energetic astrophysical phenomena and they
may be used as probes of their environments.  They are unique probes of the
early Universe.  The observations were completed as planned, and no
problems were reported.

   1.6 Completed WF/PC-2 8490 (Confirmation of a Gravitational Microlensing
Black Hole Candidate)

       The WF/PC-2 was used to make observations of MACHO-96-B as part of a
confirmation of this object as a  gravitational microlensing black hole
candidate.  This will help us test the black hole microlensing model.  The
observations were executed as scheduled, and no anomalies were noted.

   1.7 Completed Two Sets of 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.

   1.8 Completed WF/PC-2 6833 (A Cepheid Search in the Virgo Cluster Galaxy
NGC 4571)

       The WF/PC-2 was used to make observations of the Virgo Cluster
galaxy NGC-4571 in order to search for Cepheid variable stars.  The
determination of the distance to the Virgo Cluster is key to establishing
the value of the H_zero.  The observations were completed as planned, and
no problems were reported.

   1.9 Completed WF/PC-2 8274 (A Size Survey of Cometary Nuclei)

       The WF/PC-2 was used to make observations of the comet Holmes as
part of a size survey of cometary nuclei.  This is part of a program to
determine the basic physical properties of a large fraction of the
population of short-period comets.  The observations were completed as
planned, and no anomalies were reported.

   1.10 Completed FGS 8102 (FGS Astrometry of the Extrasolar Planet of GL876)

       The Fine Guidance Sensors were used to make astrometric observations
of a extrasolar planet which is orbiting the M4 class dwarf star GL876.
This will help determine the planet's mass.  The observations were
completed as planned, and no problems were reported.

   1.11 Completed 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.

   1.12 Completed WF/PC-2/STIS/CCD 7615 (Determination of the Mass Function
of a Globular Cluster Through Gravitational Microlensing)

       The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to make gravitational microlensing observations of the large globular
cluster NGC-6656 located in Sagittarius in order to study its mass
function.  Gravitational microlensing offers a unique and direct method of
determining the masses of stars and other compact objects down to planetary
masses.  A bias and dark calibration observations were also taken.  The
observations were completed as planned, and no problems were reported.

   1.13 Completed STIS/CCD 7285 (Collimation of Astrophysical Jets: The
Proto-Planetary Nebula He 3-1475)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of proto-planetary nebula HE3-1475 in order to get a
collimation of its astrophysical jets.  Recent observations of this
proto-planetary nebula in the N II Lambda 6584 A0 line with the HST WF/PC-2
have revealed what appear the be large scale flows being collimated into
narrow bipolar jets.  A wavelength calibration image was also taken.  The
observations were completed as scheduled, and no anomalies were reported.

   1.14 Completed WF/PC-2 8441 (WF/PC-2 Decontaminations and Associated
Observations Pt. 1/2)

       The WF/PC-2 was used to make its monthly decontamination operations.
Also included are instrument monitors tied to decons: photometric stability
check, focus monitor, pre- and post-decon internals {bias, internal flats,
k-spots, & darks}, and ultraviolet throughput checks.  The observations
were executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 6
                                        Successful : 6

                          Scheduled Reacquisitions : 9
                                        Successful : 9

   2.2 FHST Updates:

                              Scheduled : 12
                             Successful : 12

   2.3 Operations Notes:

       The SSR EDAC error counter was cleared three times per ROP SR-1.

       HSTAR 7173 describes several instances of marginally low
out-of-limits states for batteries 3 and 4, occurring in the interval
166/0955Z to 166/0959Z, as the HST was at the end of an orbit night period.

       As directed by ROP NS-4, thge WF/PC-2 microprocessor was dumped at
167/0451Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH