HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2350

PERIOD COVERED:  0000Z (UTC) 04/13/99 - 0000Z (UTC) 04/14/99

Daily Status Report as of 104/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed 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.

   1.2 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.  As documented in HSTAR
7098 and yesterday's report, the acquisition for the first iteration of
this proposal defaulted to fine lock backup on one FGS only.  Otherwise,
the observations were executed as scheduled, and no further anomalies were
noted.

   1.3 Completed WF/PC-2 7306 (Halo Microlens Source Systems and their
Underlying Stellar Backgrounds)

       The WF/PC-2 was used to to obtain medium-deep broadband images of
the source star STAR-0520 for microlensing events, plus one additional
star, to determine a} which star was actually lensed, b} the amount of
crowding in our ground-based frames, c} if the stars are normal in the CMD,
and d} if they lie preferentially at the back of the LMC.  The proposal
completed with no reported problems.

   1.4 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, whilst
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 will remedy this situation by undertaking redder,
line-free observations of AGN 1330+022.  The proposal completed with no
reported problems.

   1.5 Completed Seven Sets of STIS/CCD 8091 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude, non-scripted, parallel observations.  The observations
were completed as planned, and no anomalies were noted.

   1.6 Completed Three 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.

   1.7 Completed WF/PC-2 7281 (Snapshot Survey of the B2 Sample of Radio
Galaxies)

       The WF/PC-2 was used to make snapshot survey observations of the B2
sample radio galaxies B2+0708+32 and B2+1204+34.  This program is aimed to
answer the following key questions: How common are extended nuclear disks?
What is their orientation and morphology?  How common are optical jets?
The observations were executed as scheduled, and no anomalies were noted.

   1.8 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.

   1.9 Completed WF/PC-2 7277 (Calibration of the Cepheid P-L Relation with
Observations of the Maser-Host Galaxy NGC)

       The WF/PC-2 was used to make observations of the maser-host galaxy
NGC-4258 to study its Cepheid variable stars.  These data will help refine
the calibration of the Cepheid period-luminosity relationship.  The
observations were completed as scheduled, and no problems were reported.

   1.10 Completed WF/PC-2 6844 (M87 Globular Clusters {#6746 Parallel Field
Follow-up })

       The WF/PC-2 was used to make observations of the globular clusters
which are located on the "south" end of galaxy M-87.  Sub-arcsecond
dithering was employed to reduce the effect of undersampling of the point
spread function.  The observations were executed as scheduled, and no
anomalies were noted.

   1.11 Completed WF/PC-2 6357 (The Nuclear Morphology of Elliptical Galaxies)

       The WF/PC-2 was used to make images of the early type, large,
elliptical galaxy NGC-4365 (taken from a list of 150 galaxies) in order to
study its nuclear morphology.  This survey will complement Illingworth's
snapshot study of later Hubble types.  The observations were completed as
scheduled, and no anomalies were reported.

   1.12 Completed STIS/MA1 7401 (A Critical Test of Crystallization in
White Dwarf Stars)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of the white dwarf star BPM7093-2.  Theoretical calculations
indicate that the massive pulsating DA white dwarf, BPM37093, has a
crystallized ion interior.  A wavelength calibration image was also taken.
The observations were executed as scheduled, and no anomalies were noted.

   1.13 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.

   1.14 Completed WF/PC-2 8061 (POMS Test Proposal: WF-II Backup Parallel
Archive Proposal)

       This is a POMS test proposal designed to simulate scientific plans.
The proposal was executed as planned, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 11
                                        Successful : 11

                          Scheduled Reacquisitions : 8
                                        Successful : 8

   2.2 FHST Updates:

                              Scheduled : 18
                             Successful : 18

   2.3 Operations Notes:

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

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH