HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2189

PERIOD COVERED:  0000Z (UTC) 08/17/98 - 0000Z (UTC) 08/18/98

Daily Status Report as of 230/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed NIC/1/2 7258 (The Nature of the Compact Infrared Core
Sources in Powerful FR II Radio Galaxies)

       The Near Infrared Camera (Camera One) was used to make observations
of the compact infrared nuclear core region of the powerful radio galaxy
3C405.  It is hoped that these observations will provide some of the most
compelling evidence for the idea that all powerful radio galaxies contain
luminous quasars which are hidden from our direct view by obscuring torii.
The observations were completed as planned, and no anomalies were reported.


   1.2 Completed Two 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 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.

   1.4 Completed NIC/1/2/3 7857 (Investigating the Missing Link Between
Disks Around Pre-Main Sequence and Main Sequence Stars)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of star HD145788-C.  Various observations and models of
the circumstellar disk around the Main Sequence IR excess star Beta Pictors
tend to show that the optically thin dust disk is the result of destruction
processes among planetesimals.  The observations were completed as planned,
and no problems were reported.

   1.5 Completed Seven Sets of STIS/CCD 8062 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations take in parallel with the prime science
observations.  As described in HSTAR 6625 and 2.1, the acquisition for the
fifth iteration of this proposal failed and the take data flag remained
down for one observation.  Otherwise, the observations were completed as
planned, and no further problems were reported.

   1.6 Completed NIC/2 7887 (A Survey of Gravitational Lenses as
Cosmological Tools II)

       The Near Infrared Camera (Camera Two) was used to make observations
of the gravitational lens candidate system HST154433+5.  The propose is to
extend our IR survey of gravitational lenses and gravitational lens
candidates by obtaining NICMOS images of 14 additional lens systems or
candidates.  The observations were executed as scheduled, and no anomalies
were noted.

   1.7 Completed Four 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.  As described in HSTAR 6625 and 2.1, the acquisition for the third
iteration of this proposal failed and the take data flag remained down for
two observations.  Otherwise, the observations were completed as planned,
and no further problems were reported.

   1.8 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.

   1.9 Completed Two Sets of NIC/2 7835 (A Search for Superplanets Embedded
in Beta Pic & Vega-like Circumstellar Disks)

       The Near Infrared Camera (Camera Two) was used to make observations
of the circumstellar disk around star HD10700 in order to search for
superplanets.  The discovery of a circumstellar disk orbiting Beta Pictoris
as well as the discovery of other similar IR-excess Vega-like systems have
provided compelling evidence that our solar system, or at least many of the
processes which are thought to have created it, may be far from unique.
The observations were executed as scheduled, and no anomalies were noted.

   1.10 Completed Three Sets of NIC/2 7233 (Dust Disks Around Main Sequence
Stars)

       The Near Infrared Camera (Camera Two) was used to make observations
of the dust disk around main sequence star Alpha-PSA2.  The observations
were made with the coronagraph to minimize the effects of glare from the
bright central star.  A dark calibration image was also taken.  The
observations were completed as scheduled, and no anomalies were reported.

   1.11 Completed FGS 7485 (Dynamical Masses for the Stars in the
Pre-Main-Sequence Spectroscopic Binary 045251+3016)

       The Fine Guidance Sensors were to be used to make astrometric
observations of the pre-main-sequence, spectroscopic, binary star
STAR-04560 in order to obtain its dynamic mass.  An excellent single-lined
spectroscopic orbit is already completed, which provides all of the
essential orbital elements except inclination angle and mass ratio.  As
described in HSTAR 6625 and 2.1, the acquisition for this proposal failed
and the take data flag remained down.

   1.12 Completed Two Sets of NIC/2/3 8063 (NICMOS Pure Parallel Sponge -
Backup)

       The Near Infrared Camera (Cameras Two and Three) was used to make
observations taken in parallel with the prime science observations.  This
proposal is PRE-the new FOM default.  As described in HSTAR 6625 and 2.1,
the acquisition for the first iteration of this proposal failed and the
take data flag remained down, affecting two observations.  Otherwise, the
observations were executed as scheduled, and no further anomalies were
noted.

   1.13 Completed Three Sets of 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 final iteration of this proposal was
affected by the STIS suspend described in 2.3.  Otherwise, the observations
were completed as scheduled, and no further problems were reported.

   1.14 Completed STIS/MA1 7645 (STIS FUV-MAMA Cycle 7 Flats)

       The Space Telescope Imaging Spectrograph (MA1) was to be 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 to be taken.
The observations were affected by the STIS suspend described in 2.3 which
occurred near the beginning of this proposal.

   1.15 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-221735.  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.

   1.16 Completed STIS/CCD/WF/PC-2/NIC/1/2/3 7174 (LBDS 53W091: A Cluster
of Old, Red Galaxies)

       The Space Telescope Imaging Spectrograph (CCD), the WF/PC-2 and the
Near Infrared Camera ( Cameras One, Two and Three) were used to make
observations of the cluster of old red galaxies known as LBDS53W091.  This
distant cluster { at Z=1.55 } is representative of the oldest stellar
systems we can glimpse at their "middle age"; and we are interested in
their morphologies.  The STIS portion if this proposal was affected by the
STIS suspend described in 2.3.  Otherwise, the observations were executed
as scheduled, and no further anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 10
                                        Successful : 9

       The acquisition at 229/180805Z failed when it was interrupted by
astometry operations.  A high attitude error vector was observed.  HSTAR
6625 was written.  The proposals described in 1.5, 1.7, 1.11, and 1.12 were
affected.

                          Scheduled Reacquisitions : 7
                                        Successful : 7

   2.2 FHST Updates:

                              Scheduled : 20
                             Successful : 20

   2.3 Operations Notes:

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

       The PRS string (AP2) with the old PRS software was released at
229/1016Z.

       A DF-224 dump was collected at 229/1535Z on CCS strings A and B.

       As described in HSTAR 6626, a NICMOS single bit error occurred at
229/212356Z.  At 229/223609Z the error log was dumped and the ground system
limit was changed from three to four.

       Per HSTAR 6629, STIS suspended at 229/215515Z while at the beginning
of the proposal described in 1.14.  Indications are that the suspend was
caused by an invalid MAMA optical mode selection during a MAMA1 high
voltage operation.  Also affected were the proposals described in 1.13 and
1.16, as well as any STIS proposal occurring before the STIS is recovered
(which will be reported in tomorrow's report).  Using ROP NS-10, the STIS
memory was dumped at 229/2344Z, the SI C&DH errors were reset at 230/0126Z
per ROP NS-5, and the NSSC-1 status buffer was dumped and reset at
230/0919Z per ROP NS-3.  Recovery could be attempted at approximately
230/1049Z, although another occurrence of the erroneous commanding will
occur at 230/1800Z.  The anomaly and the future problem will be discussed
at a meeting this morning.

       Real-time operations tranferred to the SAMS backup facility at
230/0600Z to verify the SAMS capability and to provide practical training
for operations personnel.  PASSOPS will remain in the MOR since UPS is not
yet available in the SAMS facility.  Operations personnel should return to
the MOR at approximately 230/2400Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH