HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2168

PERIOD COVERED:  0000Z (UTC) 07/17/98 - 0000Z (UTC) 07/20/98

Daily Status Report as of 201/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Nine 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.

   1.2 Completed Six Sets of STIS/CCD 7948 (CCD Dark and Bias Monitor --
Cont. to Dec. 98)

       The Space Telescope Imaging Spectrograph (CCD) was used 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.  The data will be used 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.

   1.3 Completed Three Sets of NIC/1/2/3 7883 (Infrared Imaging of High
Redshift {0.4 <= z <= 1} Tully-Fisher Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the high redshifted Tully-
Fisher class galaxies GSS-113-06, GSS-104-40 and GSS-084-68.  With the
advent of 10 meter class telescopes combined with the high spatial
resolution of the HST, it is now possible to study the internal kinematics
and structural properties of galaxies out to a redshift of z ~ 1.  The
observations were completed as planned, and no anomalies were reported.

   1.4 Completed Fourteen Sets of WF/PC-2 7909 (POMS Test Proposal: WF II
Parallel Archive Proposal)

       The WF/PC-2 was used to make parallel observations as part of the
POMS test proposal.  This test proposal is designed to simulate scientific
plans.  The observations were completed as planned, and no problems were
reported.

   1.5 Completed Ten 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.

   1.6 Completed Two Sets of 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.

   1.7 Completed STIS/CCD 8064 (POMS Test Proposal: STIS Non-Scripted
Parallel Proposal - Backup)

       The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
non-scripted parallel POMS test.  The observations were completed as
scheduled, and no problems were reported.

   1.8 Completed NIC/1 7867 (NICMOS Imaging of the Dusty CfA Seyfert Nuclei)

       The Near Infrared Camera (Camera One) was used to make observations
of the Seyfert Galaxy NGC-5929.  These data will allow us to determine if
the Seyfert Type 1/2 dichotomy is best explained by the unified model, the
evolutionary picture, or a combination of both of these scenarios.  The
observations were executed as scheduled, and no anomalies were reported.

   1.9 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.

   1.10 Completed FOC/96 7686 (FOC Cycle 7 PSF Monitoring - Version 2)

       The Faint Object Camera (f/96) was used to measure the point spread
function (PSF) by making observations of standard star BPM16274.  Data will
be taken four times during the cycle.  The observations were executed as
planned, and no anomalies were reported.

   1.11 Completed Eleven Sets of NIC/2/3 7907 (NICMOS Pure Parallel Winter
97-98)

       The Near Infrared Camera (Cameras Two and Three) was used to make
pure parallel spectrographic observations of sky regions when another
instrument is prime.  The observations were completed as planned, and no
anomalies were reported.

   1.12 Completed Five Sets of STIS/CCD 7910 (STIS Extragalactic Parallel
Survey)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
extragalactic slitless spectrographic observations as part of the parallel
high galactic latitude survey to search for emission line galaxies.  Data
was taken in parallel, and are not subject to proprietary time.  The
observations were executed as scheduled, and no anomalies were noted.

   1.13 Completed NIC/1/2/3 7875 (Searching for Old Stellar Populations in
Candidate Proto-Spheroidals)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations searching for old stellar populations in candidate
proto-spheroid SA68-8846.  We have compelling evidence from WF/PC-2 images
that these galaxies have optical colors gradients.  The near-infrared is
necessary, however, to reveal color gradients large enough to separate
young and old stellar populations.  Only NICMOS imaging provides enough
spatial resolution and depth to resolve these gradients.  The observations
were completed as planned, and no problems were reported.

   1.14 Completed Two Sets of NIC/2 7227 (A Search for Low
Mass/Sub-Luminous Companions to M-Stars)

       The Near Infrared Camera (Camera Two) was used to make a search for
low mass/sub-luminous companions to low mass M class stars.  Knowledge of
stellar and sub-stellar masses and luminosities at and below the ~0.08
M{sun} H-burning limit is of fundamental importance.  A dark calibration
image was also taken.  The observations were completed as planned, and no
problems were reported.

   1.15 Completed NIC/1/2/3 7869 (The Morphology of Dense Gas in Seyferts ,
Obstruction and Fueling of AGNs)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the Seyfert galaxy Markarian9 to study the morphology
of its dense gas.  Near-Infrared color maps and images in H-2 emission will
be used to trace hot and cold dense gas in this Seyfert galaxy.  The
observations were executed as scheduled, and no anomalies were noted.

   1.16 Completed NIC/1/2/3 7855 (The Evolution of Powerful Radio Galaxies)

       The Near Infrared Camera (Camera One, Two and Three) was used to
make observations of the powerful radio galaxies 3C42 and 3C46.  Our
proposed NICMOS observations combined with our multi-wavelength observing
program will finally provide us with the data we need to build a picture of
how powerful radio galaxies evolve.  The observations were completed as
planned, and no porblems were reported.

   1.17 Completed WF/PC-2 7385 (Low-Mass Halo Binaries)

       The WF/PC-2 was used to make observations of the low mass, halo,
binary, {Population II}, M-type, sub-dwarf, star LHS3409.  This star is too
faint to be resolved through ground-based speckle interferometry, thus HST
represents the only means of probing separations.  The observations were
completed as planned, and no anomalies were reported.

   1.18 Completed FOC/96 6618 (A Hidden Power Source in the QSO PG 1630+377)

       The Faint Object Camera (f/96) was used to make observations of
quasar PG1630+337 in order to study its hidden power source.  For this
hidden source to be so bright as seen only through scattering indicates
that it may be intrinsically the most significant power source shortward of
the Lyman edge.  An internal flat calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted

   1.19 Completed NIC/1/2/3 7896 (A NIR Snapshot Survey of Ultraluminous IR
Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make snapshot survey observations of the ultraluminous infrared galaxy
QDOTULIR13.  Nearly all of these galaxies show evidence for a recent tidal
interaction, and we will search for evidence of the merger progenitors near
the center of each galaxy, a task made significantly easier with NIR
imaging.  The observations were completed as planned, and no anomalies were
noted.

   1.20 Completed STIS/CCD/MA1 7613 (Structure and evolution of the
globular cluster low mass X-ray binary AC211 in M15)
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        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make observations of the globular cluster NGC-7078 (a.k.a., M-15) in order
to study its binary x-ray star AC211.  AC211 is optically the brightest
counterpart of any globular cluster X-ray binary, and one of the brightest
amongst all LMXBs.  Given its large UV excess and high orbital inclination
{evident from its large UV eclipse} this object is a prime target for HST.
A wavelength calibration image was also taken.  The observations were
executed as scheduled, and no anomalies were noted.

   1.21 Completed NIC/1/2/3 7826 (Near-IR Photometry of M-31's Metal-Rich
Globular Clusters)

       The Near Infrared Camera (Cameras One, Two and Three) were used to
make observations of the metal-rich globular clusters in galaxy M-31.  The
high metallicities of the program clusters will make these observations of
particular interest for furthering our understanding of the evolution of
metal rich stars, and for the population synthesis models meant to study
the stellar content of distant, unresolvable bulges and elliptical
galaxies.  The observations were executed as scheduled, and no anomalies
were noted.

   1.22 Completed NIC/2 7853 (Deep IR Imaging of Two Gas-Rich Radio Galaxies)

       The Near Infrared Camera (Camera Two) was used to make high
resolution continuum, line and polarization images of the gas-rich radio
galaxy 3C305.  This is to obtain a deep IR image to locate the true nuclei
and clarify the structure of the galaxies in order to test merger models.
The observations were executed as scheduled, and no anomalies were noted.

   1.23 Completed NIC/1/2/3/STIS/CCD/MA1/MA2 7585 (Effects of Activity on
Stellar Atmospheres)

       The Near Infrared Camera (Cameras One, Two and Three) and the Space
Telescope Imaging Spectrograph (CCD, MA1 and MA2) were used to make
observations of the stellar atmosphere of star HD131156A.  These data will
be compared with spatially-resolved spectra of active and quiet solar
features recorded at wavelengths between 110 nm and 160 nm with the SUMER
instrument on SOHO.  A wavelength calibration image was also taken.  The
observations were completed as planned, and no problems were reported.

   1.24 Completed NIC/2 7895 (HST NICMOS Snapshot Observations of Field
Galaxies at Z < 1)

       The Near Infrared Camera (Camera Two) was used to make observations
of the field galaxy Gal-141746.  The proposed NICMOS observation will
provide their morphology in rest frame NIR wavelengths {8000 - 16000 A},
where the effect of dust extinction is less severe, and their near infrared
{NIR} colors.  The observations were completed as scheduled, and no
anomalies were reported.

   1.25 Completed NIC/1/2 7319 (Composition and Heterogeneity of Io's
Volcanoes From Polarimetry of their Thermal Emission)

       The Near Infrared Camera (Cameras One and Two) was used to make
polarimetry observations of Jupiter's moon Io in order to study the
composition and heterogeneity of its thermal emissions.  Measurements were
taken of the linear polarization of Io's 2 Mum volcanic thermal emissions
while the moon was in Jupiter's shadow in order to study the lava
composition and its variation among different hot spots on Io's surface.
The observations were completed as scheduled, and no anomalies were noted.

   1.26 Completed WF/PC-2 6675 (The Evolution of Galaxies in Groups)

       The WF/PC-2 was used to make observations of the radio galaxy
4C27.51.  There is now convincing evidence that galaxy evolution has
progressed as a strong function of the environment.  The strongest
evolution is seen in the cores of rich clusters.  The observations were
completed as planned, and no anomalies were reported.

   1.27 Completed NIC/3 7903 (NICMOS GRISM Dispersion Monitoring)

       The Near Infrared Camera (Camera Three) was used to perform GRISM
dispersion monitoring by making observations of source HB12.  This is to
monitor the wavelength dispersion solution for the NICMOS grisms after the
NIC/3 Campaign.  The observations were completed as scheduled, and no
anomalies were reported.

   1.28 Completed NIC/2 7873 (NICMOS Observations of Potential JVAS/CLASS
Gravitational Lenses)

       The Near Infrared Camera (Camera Two) was used to make observations
of the potential gravitational lens system J0307+1035.  The JVAS/CLASS
surveys have been the most successful to date at finding arcsecond-scale
gravitational lenses, almost doubling the known number {11 lenses found of
which 10 are new discoveries}.  The observations were executed as
scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 22
                                        Successful : 22

                          Scheduled Reacquisitions : 22
                                        Successful : 22

   2.2 FHST Updates:

                              Scheduled : 45
                             Successful : 45

   2.3 Operations Notes:

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

       The Battery 1 Capacity Check Test completed at 198/1231Z.

       There was no ODM or GCMR capability from 198/2310Z until 199/0100Z
due to an in-house NAS1 port problem.  A TTR was written.

       A full DF-224 dump was commanded and received on CCS strings A and B
at 200/0228Z.

       The ground master image was updated at 200/0329Z.

       The STIS MCE-2 reset at 200/235202Z while the high voltage was off.
HSTAR 6589 was written.  ROP NS-12 was executed at 201/0021Z to clear the
STIS error counter.  Recovery of MAMA-2 will be accomplished via the SMS at
202/1151Z at the time of the next scheduled high voltage turn-on.

       As documented in HSTAR 6590, there was an erroneous NICMOS "PAM to
hold" transition in the SMS at 200/2308Z which resulted in two status
buffer messages at 201/015849Z and 201/020514Z, times which corresponded to
PAM mechanism motion commands.  The messages were caused since there was
"an attempt to move the PAM x-tilt, y-tilt or focus mechanism without
enabling limits checking of the PAM sensor".  Using ROP NS-11, the NICMOS
flight software error counter was reset at 201/0258Z.  Operations request
13891 was executed at 201/04434Z to activate and move PAM-3.

       One megabit realtime science was received from 198/1106Z to
198/1107Z, and from 201/0234Z to 201/0235Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH