HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2144

PERIOD COVERED:  0000Z (UTC) 06/12/98 - 0000Z (UTC) 06/15/98

Daily Status Report as of 166/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Three Sets of 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.

   1.2 Completed Twenty 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.  During the first iteration of this
proposal, the late acquisition and four losses of lock described in HSTAR
6528 and in the previous report occurred, affecting one observation.
During the third iteration of this proposal, there was a loss of lock as
described in 2.1 (and HSTAR 6532) that affected one observation.  During
the ninth iteration of this proposal, the acquisition failures mentioned in
2.1 and HSTAR 6536 occurred.  During the tenth iteration, the ARU/PRT was
uplinked, and from the re-acquisition all observations were successful.
During the fifteenth iteration, the fine lock backup mentioned in 2.1 and
HSTAR 6539 occurred, possibly affecting the observations.  Otherwise, the
observations were completed as planned, and no further problems were
reported.

   1.3 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.

   1.4 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 3C267 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 first iteration of this proposal, the two losses of
lock detailed in HSTAR 6530 and in the previous report occurred.  During
the second iteration of this proposal, there was a loss of lock as
described in 2.1 (and HSTAR 6532) that affected one observation.  During
the third iteration, the losses of lock mentioned in HSTAR 6534 and 2.1
occurred, affecting three observations.  Otherwise, the observations were
executed as scheduled, and no further anomalies were noted.

   1.5 Completed WF/PC-2 8049 (Long WF/PC-2 Decontaminations during 2nd
NIC/3 Campaign)

       The WF/PC-2 was used to make long decontamination procedures as part
of the second NIC/3 campaign.  Each decon is followed by five 30-minute
darks.  During this time, no external science WF/PC-2 observations were
executed.  During this proposal, the losses of lock mentioned in HSTAR 6534
and 2.1 occurred, affecting three observations.  Otherwise, the
decontaminations were executed as scheduled, and no further anomalies were
noted.

   1.6 Completed NIC/3 7816 (NIC/3 Photometric Zero Point)

       The Near Infrared Camera (Camera Three) was used to make
observations of standard star BRI0021-CA in order to study the zero point
flux for a set of filters.  The NIC/3 intra-pixel sensitivity will also be
measured.  The observations were executed as scheduled, and no anomalies
were noted.

   1.7 Completed NIC/3 7830 (IR Spectra for Known-Mass M Dwarfs)

       The Near Infrared Camera (Camera Three) was used to make infrared
spectrographic observations of M-Class dwarf star GJ623AB.  Over the last
decade there has been considerable debate on two major issues in the
low-mass star literature: {1} the effective temperature scale for M dwarfs
and its relation to mass and luminosity and {2} the conversion from an
absolute magnitude in some passband to a bolometric magnitude.  The
observations were executed as scheduled, and no anomalies were noted.

   1.8 Completed Seventeen Sets of NIC/3 7919 (NICMOS Camera 3 Campaign
Snapshots)

       The Near Infrared Camera (Camera Three) was used to make images of
galaxies NGC-224, NGC-7309, NGC-5605, NGC-3571, NGC-128, NGC-6754, NGC-672,
NGC-4085, NGC-4144, NGC-3379, NGC-4293, NGC-4449, NGC-598, NGC-4389,
NGC-2787 and NGC-4183 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.  During the first
iteration of this proposal, the acquisition failures mentioned in 2.1 and
HSTAR 6536 occurred.  During the seventh iteration, the fine lock backup
mentioned in 2.1 and HSTAR 6539 occurred, possibly affecting the
observations.  Otherwise, the observations were executed as planned, and no
further anomalies were reported.

   1.9 Completed Two Sets of 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.

   1.10 Completed Four Sets of NIC/1/2/3 7817 (A Complete NICMOS Map of the
Hubble Deep Field)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations to map the complete WF/PC-2 region of the central Hubble
Deep Field.  These data will provide unique information about the faintest
objects, but will include only a small number of objects with spectroscopic
redshifts or z ~ 3 Lyman break galaxies.  During the first and second
iterations of this proposal, the re-acquisitions failed that are mentioned
in HSTAR 6536 and in 2.1 occurred.  During the third iteration, the losses
of lock mentioned in 2.1 and HSTAR 6538 occurred.  Otherwise, the
observations were executed as scheduled, and no further anomalies were
noted.

   1.11 Completed Four Sets of WF/PC-2 8013 (WF/PC-2 Parallel Images to the
HDF Flanking Fields {Companion Proposal to 7817})

       The WF/PC-2 was used to make observations parallel to the Hubble
Deep Field observations (i.e., flanking fields).  The complete WF/PC-2
region of the central Hubble Deep Field {HDF} was being mapped with the
NICMOS Camera 3 at F110W and F160W {proposal 7817}.  While these
observations were executing, the WF/PC-2 was working in parallel mode to
image areas near this field.  During the first iteration of this proposal,
the re-acquisitions failed that are mentioned in HSTAR 6536 and in 2.1
occurred.  During the second iteration, the acquisitions failure mentioned
in the same HSTAR occurred.  The recovery also occurred during this
iteration.  During the third iteration, the losses of lock mentioned in 2.1
and HSTAR 6538 occurred.  Otherwise, the observations were completed as
scheduled, and no further anomalies were reported.

   1.12 Completed NIC/1/2/3 7239 (Surface Compositions of Kuiper Belt Objects)

       The Near Infrared Camera (Cameras One, Two, and Three) was used to
make observations of the Kuiper Belt object Pholus in order to study its
surface composition.  The surfaces of Kuiper Belt Objects contain a record
of formative and dynamical processes in the outer solar system.  The
observations were executed as scheduled, and no anomalies were noted.

   1.13 Completed NIC/1/2/3 7822 (Grism Spectra of Centaurs and TNOs from
1-2 Microns)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make grism spectra of object 1997CU26 from 1-2 microns.  The surfaces of
Centaurs and Trans-Neptunian Objects (TNOs) contain potentially unique
records of early evolutionary processing {accretional and dynamical} in the
outer solar system.  The observations were executed as scheduled, and no
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.

   1.15 Completed NIC/1/2/3 7223 (Spectrophotometry and Imaging of Pluto
and Charon)

       The Near Infrared Camera (Cameras One, Two, and Three) was used to
make observations of Charon.  Detailed spectra of the individual members of
the Pluto-Charon system are not known.  The observations were completed as
scheduled, and no problems were reported.

   1.16 Completed NIC/3 7892 (Narrow-band Imaging of BAL QSOs)

       The Near Infrared Camera (Camera Three) was used to make narrow band
observations of the BL-Lac (BAL) QSO Q1225+1512.  The detection of extended
emission-line gas structures in BAL QSOs would offer another means of
investigating the BAL QSO phenomenon as well as establishing a new probe of
material in galaxies at high redshift.  The observations were completed as
planned, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 34
                                        Successful : 32
                          Scheduled Reacquisitions : 15
                                        Successful : 13

       HSTAR 6532 documents a loss of lock at 163/0928Z after a T3 slew.
The proposals described in 1.2 1nd 1.4 were affected.

       HSTAR 6534 documents multiple losses of lock around 163/125745Z,
following a profiled (T3) slew.  The proposals described in 1.4 and 1.5
were affected.

       The re-acquisition at 164/0506Z failed while the vehicle was in fine
lock.  A map at 164/0513Z showed a 127-second arc-second roll error, and an
ARU/PRT slew was uplinked at 164/0618Z.  This slew was rejected since an
FGS clearing slew (not shown on the MEGG timeline) was in progress.
Another re-acquistion at 164/063Z also failed.  Then at 164/0901Z and at
164/0935Z two primary acquisitions failed.  The SPC error flag was reset at
164/0819 per ROP DF-16.  Another ARU/PRT was successfully uplinked at
164/0901Z.  The following re-acquisition at 164/0935Z was successful.
These events are described in HSTAR 6536.  The proposals described in 1.2,
1.8, 1.10, and 1.11 were affected.

       HSTAR 6538 documents multiple losses of lock near 165/0528Z and
165/0705Z following T3 slews.  The proposals described in 1.10 and 1.11
were affected.

       The acquisition at 165/165033Z failed to fine lock backup on FGS-3
only when the FGS-1 scan step limit was exceeded.  The proposals described
in 1.2 and 1.8 may have been affected.

   2.2 FHST Updates:

                              Scheduled : 53
                             Successful : 52

       As described in HSTAR 6533 the roll delay update scheduled at
163/134320Z failed.  The subsequent guide star acquisition AT 163/145529Z
succeeded.

   2.3 Operations Notes:

       The SSR EDAC error counter was reset four times using ROP SR-1.

       DF-224 SPC dumps were collected at 164/1544Z (on B String) and at
165/1800Z (on A String) for CCS testing purposes.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH