HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2398

PERIOD COVERED:  0000Z (UTC) 06/21/99 - 0000Z (UTC) 06/22/99

Daily Status Report as of 173/0000Z

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.  As described in
yesterday's report and HSTAR 7180, the acquisition for the second iteration
of this proposal failed and the take data flag was down.  Otherwise, the
observations were executed as scheduled, and no further anomalies were
noted.

   1.2 Completed WF/PC-2 8210 (HST Imaging of Bi-Polar Proto-Planetary
Nebulae and Circumstellar Arcs)

       The WF/PC-2 was used to make observations of the bi-polar
proto-planetary nebula IRAS22574.  Proto-planetary nebulae provide the best
opportunity to test theories of asymptotic giant branch mass loss
{symmetric/asymmetric, continuous/episodic} and the processes which shape
planetary nebulae.  As described in yesterday's report and HSTAR 7180, the
acquisition for this proposal failed and the take data flag was down for
the first half of the proposal.  Otherwise, the observations were completed
as planned, and no further problems were reported.

   1.3 Completed Three Sets of WF/PC-2 8442 (WF/PC-2 Cycle 8 Standard Darks)

       The WF/PC-2 was used to make a series of Cycle 8 standard dark
calibration observations.  This dark calibration program obtains dark
frames every week in order to provide data for the ongoing calibration of
the CCD dark current rate, and to monitor and characterize the evolution of
hot pixels.  The observations were executed as scheduled, and no anomalies
were noted.

   1.4 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.

   1.5 Completed Three 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.

   1.6 Completed WF/PC-2 8031 (Gaseous Disks in Galactic Nuclei)

       The WF/PC-2 was used to make observations of the gaseous disk in
galactic disk of galaxy NGC-4168.  Follow-up long-slit medium resolution
STIS spectroscopy along the principle axis of the nuclear gas disk will
then be used to map the gas kinematics.  The observations were executed as
scheduled, and no anomalies were noted.

   1.7 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.

   1.8 Completed Three Sets of WF/PC-2 6356 (SNAPSHOT Survey of
Ultraluminous Infrared Galaxies)

       The WF/PC-2 was used to make observations of galaxies GAL-100238,
NGC-3184 and Gal-063608 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.

   1.9 Completed WF/PC-2/STIS/CCD/MA1 8027 (Star-formation Knots in Distant
Galaxies)

       The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD and
MA1) were used to make long slit spectra observations of the star formation
knots in the distant merging galaxy NGC-4038.  Ultraviolet and visible
images were obtained.  A wavelength calibration observation was also taken.
The observations were completed as planned and no anomalies were reported.

   1.10 Completed STIS/CCD/MA1/MA2 8540 (STIS UV Spectroscopy of the Bright
Galactic Nova Velorum 1999)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used
to make ultraviolet spectrographic observations of the bright galactic
Nove-Velorum-1999.  Nova Velorum 1999 {V382 Vel}, discovered on 1999 May
22, is the ninth brightest classical nova in recorded history, and probably
the brightest nova that will occur during the HST mission.  A wave length
calibration image was also taken.  The observations were executed as
scheduled, and no anomalies were noted.

   1.11 Completed STIS/MA2 7950 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA2) was used to make a
dark calibration image.  This is to establish if the detectors are
performing nominally, that no internal movement of the MCP has taken place,
and establish dark level in orbit for a given operating temperature.  These
darks will be used in later image reduction and also trended over
instrument life time as indicators of detector degradation or damage.  The
observations were completed as planned, and no problems were reported.

   1.12 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
3C238.0.  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.

   1.13 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 AM1 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.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 8
                                        Successful : 8

                          Scheduled Reacquisitions : 9
                                        Successful : 9

   2.2 FHST Updates:

                              Scheduled : 19
                             Successful : 19

   2.3 Operations Notes:

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

       A TTR was written for a 2-minute, 35-second loss of 32k engineering
data because a GCMR could not be sent during a TDRS mode change.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH