HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2139

PERIOD COVERED:  0000Z (UTC) 06/05/98 - 0000Z (UTC) 06/08/98

Daily Status Report as of 159/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Nineteen Sets of NIC/3 7919 (NICMOS Camera 3 Campaign
Snapshots)

       The Near Infrared Camera (Camera Three) was used to make images of
galaxies NGC-2672, NGC-4395, NGC-4111, NGC-2976, NGC-3675, NGC-4605,
NGC-2639, ngc-2681, NGC-2366, NGC-4299, NGC-3769, NGC-5474, NGC-4786,
NGC-491, NGC-4278, NGC-5641, NGC2642, NGC-4826, NGC-4136, NGC-4571,
NGC-5585, NGC-5908 and NGC-4490 as part of the NICMOS Camera 3 campaign
snapshots.  The proposal is to obtain wide field snapshot images of nearby
galaxies in Paschen Alpha which is inaccessible from the ground.  As
described in HSTAR 6508 and in the previous report, the guide star
acquisition for the first iteration of this proposal failed, and the take
data flag remained down.  Otherwise, the observations were executed as
planned, and no further anomalies were reported.

   1.2 Completed STIS/CCD 7926 (CCD Dark and Bias Monitor -- Continued)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
several dark and bias calibration observations.  This is to measure CCD
dark current and bias rates for the two supported amplifier settings {gain
= 1 and gain = 4} in order to gather data for making superdarks and
superbiases.  These observations will also 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.

   1.3 Completed Four Sets of NIC/3 7872 (A Morphological Census of z > 1
Cluster Galaxies in the Optical Rest-Frame)

       The Near Infrared Camera (Camera Three) was used to make
observations of the galactic cluster containing 3C210, Lynx P1, P2 and P3.
Our existing WF/PC-2 imaging of this cluster has let us study the
rest-frame ultraviolet light from these galaxies. The proposed NICMOS
imaging will allow us to morphologically classify the cluster galaxies at
rest-frame optical wavelengths and to place them into the context of the
Hubble Sequence.  During the final iteration of this proposal, the failed
re-acquisition described in 2.1 occurred, and the take-data remained down
for three observations.  Otherwise, the observations were executed as
scheduled, and no further anomalies were noted.

   1.4 Completed Eighteen Sets of STIS/CCD 7908 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
calibration observations as part of the POMS Test Proposal.  This was a
STIS non-scripted parallel proposal.  The observations were completed as
planned, and no problems were reported.

   1.5 Completed NIC/1/2/3 7456 (Water in Protoplanetary Disks)

       The Near Infrared Camera (Cameras One, Two, and Three) was used to
make observations of the protoplanetary disk around star WL16 to search for
water in its disks.  This survey will be the first to take a detailed look
at the gas phase properties of pre-main-sequence disks at AU distances.
The observations were completed as scheduled, and no anomalies were
reported.

   1.6 Completed STIS/MA2 7604 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA2) was used to make MAMA
dark measurements.  These darks will be used in later image reductions and
also trended over the instrument's life time as an indicator of the
detector's degradation or damage.  The observations were completed as
scheduled, and no problems were reported.

   1.7 Completed STIS/MA2 7647 (STIS NUV-MAMA Cycle 7 Flats)

       The Space Telescope Imaging Spectrograph (MA2) was used to make
near-ultraviolet (NUV) flat calibration images.  This program will obtain
NUV-MAMA flat-field observations with the D2 lamp for the construction of
on-orbit D-flats for G230M.  A dark calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.8 Completed Three Sets of NIC/1/2/3 7871 (The Properties of High
Redshift Galaxies : A Near-Infrared Redshift Survey)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make infrared galactic survey observations of high redshifted galaxies in s
sky field designated as Field-1417.  A comparison between the population of
galaxies in the low {z<1} and high {z>2} redshift universe has shown that
the peak era of star forming activity in the universe occurs in the
redshift interval 1<z<2.  During the second iteration of this proposal, a
loss of lock occurred at 157/202442Z, temporarily taking down the take-data
flag and affecting one observation.  HSTAR 6511 was written.  Otherwise,
the observations were executed as scheduled, and no further anomalies were
noted.

   1.9 Completed NIC/1/2/3 7474 (Searching for Low Mass Stars: the Mass
Function at the Hydrogen Burning Limit)

       The Near Infrared Camera (Cameras One, Two, and Three) was used to
use the unprecedented IR imaging capabilities of NICMOS to study the
low-mass stars at the end of the main sequence in the nearby globular
cluster NGC-5139 which spans a wide range of metallicity, precisely at the
wavelength corresponding to their maximum emission. These observations
would complete our ongoing investigation by making it possible, for the
first time, to reliably count stars right down to and beyond the main
sequence H-burning limit, thus leaving no doubt as to whether the IMF
indeed drops there or starts rising once again close to the limit.  The
observation completed as planned with no problems.

   1.10 Completed STIS/CCD 7911 (STIS Galactic Plane Pure Parallel Program)

       The Space Telescope Imaging Spectrograph (CCD) was used to make low
galactic latitude survey observations in parallel with the prime science
observations.  Short exposures with the 50CCD imaging mode will provide the
wavelength zero-point calibration.  These data will be placed immediately
into the Hubble Data Archive.  The observations were executed as scheduled,
and no anomalies were noted.

   1.11 Completed STIS/CCD 7645 (STIS FUV-MAMA Cycle 7 Flats)

       The Space Telescope Imaging Spaectrograph (CCD) was used to make
far-ultraviolet flat calibration images.   This program will obtain
FUV-MAMA flat-field observations with the Kr lamp for the construction of
on-orbit D-flats for G140M.  A dark calibration image was also taken.  The
observations were completed as planned, and no anomalies were reported.

   1.12 Completed NIC/3 7818 (Spectrophotometry of Pluto and Charon)

       The Near Infrared Camera (Camera Three) was used to make high
signal-to-noise ratio specrophotometric observations of the planet Pluto
and its moon Charon.  These observations will be used to separate the
spectroscopic signatures of each object in future ground-based combined
light measurements.  These spectra will also provide a very sensitive
search for trace molecular components on the surfaces of Pluto and Charon.
The observations were completed as scheduled, and no problems were
reported.

   1.13 Completed NIC/3 7959 (NICMOS GRISM Absolute Sensitivity and
Wavelength Calibration)

       The Near Infrared Camera (Camera Three) was used to make
observations of standard source P330-E in order to make an absolute
sensitivity and wavelength calibration.  This is to make measurements of
the absolute sensitivity the three NICMOS grisms with one solar analog
standard.  The wavelength dispersion solution for the two NICMOS grisms
will be used in the HDF observations, and to supply of calibration for
spectroscopic observations during NIC/3 Campaign.  During this observation,
there were two losses of lock in the interval 157/163400Z - 157/172400Z,
temporarily taking down the take-data flag.  HSTAR 6514 was written.
Otherwise, the observations were completed as planned, and no further
anomalies were noted.

   1.14 Completed STIS/CCD 8051 (STIS Out-of-Focus PSF)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of standard source GRW+70D582 in order to study the
out-of-focus point spread function.  The observations were completed as
scheduled, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 38
                                        Successful : 37

       As documented in HSTAR 6511, there was a loss of lock at 157/202442Z
during a profiled slew.  One observation from the proposal described in 1.8
was affected.

       There was loss of lock at 157/212815Z, occuring during a difficult
reacquisition.  No observation were impacted.  HSTAR 6512 was written.

       As contained in HSTAR 6514, there was two losses of lock during the
interval 157/163400Z - 157/172400Z that affected the proposal described in
1.13.

       The acquisition at 159/060020Z failed to RGA control following at
least five losses of lock.  A 40-minute iteration of STIS proposal 8051
(STIS Out-of-Focus PSF) was affected.  HSTAR 6517 was written.  These
events occur during the period of the next report.

                          Scheduled Reacquisitions : 18
                                        Successful : 17

       During the re-acquisition at 158/043909Z, there was a failure to RGA
control.  HSTAR 6513 was written.  Three observations of the proposal
described in 1.3 were affected.

       There were multiple losses of lock, affecting two observations,
beginning at 159/090232Z, during the execution of NICMOS proposal 7871 (The
Properties of High Redshift Galaxies : A Near-Infrared Redshift Survey)
which occurs during the period of the next report.  HSTAR 6518 was written.


   2.2 FHST Updates:

                              Scheduled : 61
                             Successful : 60

       The map at 158/132413Z failed due to no stars detected in FHST-1.
HSTAR 6516 was written.

   2.3 Operations Notes:

       Using ROP SR-1, the SSR EDAC error counter was reset seven times.

       The STIS MCE-1 reset at 158/214134Z, during an SAA event and while
the low voltage was on.  The MCE will be recovered via the SMA at
161/044430Z, the time of the next MAMA-1 high voltage on event.  HSTAR 6515
was written.  The STIS error counter was reset at 158/2234Z per ROP NS-12.
No science was affected by this event.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH