HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2149

PERIOD COVERED:  0000Z (UTC) 06/19/98 - 0000Z (UTC) 06/22/98

Daily Status Report as of 173/0000Z

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 Seven 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.  The observations were executed as
scheduled, and no anomalies were noted.

   1.3 Completed Seven 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.  The observations were completed as scheduled,
and no anomalies were reported.

   1.4 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.

   1.5 Completed Three Sets of 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 objects Chiron, 1993HA2 and 1996RR20 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.

   1.6 Completed Five Sets of NIC/3 7830 (IR Spectra for Known-Mass M Dwarfs)

       The Near Infrared Camera (Camera Three) was used to make infrared
spectrographic observations of the M-Class dwarf stars KELU1, GJ22ABC,
GJ699, GJ752B, GJ1245ABC,GJ860AB, GJ1005AB and GJ406.  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.  During the first
iteration of this proposal, the default to fine lock detailed in 2.1
occurred.  Otherwise, the observations were executed as scheduled, and no
further anomalies were noted.

   1.7 Completed Three Sets of NIC/1/2/3 7322 (The IMF Below 1 Msun in
Young Clusters: 1.9 Micron Water Band Imaging of IC348)

       The Near Infrared Camera (Cameras One, Two, and Three) was used to
make observations of clusters GL-699, BD+01D4774, VB-10.  This study will
be the first to obtain spectral types for a young cluster population
complete to K=16, and thereby quantify, to unprecedentedly high precision,
the IMF below 1M{sun} in young clusters.  The observations were executed as
scheduled, and no anomalies were reported.

   1.8 Completed Seven 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.

   1.9 Completed Three Sets of NIC/3 7919 (NICMOS Camera 3 Campaign Snapshots)

       The Near Infrared Camera (Camera Three) was used to make images of
the galaxies NGC-151, NGC-2998 and NGC-6699 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.
The observations were executed as planned, and no anomalies were reported.

   1.10 Completed Two Sets of 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 stars 1548C27 and
AS353A to search for water in their 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.

   1.11 Completed NIC/3 7841 (HST/NICMOS Observations of the Nearest
Embedded Cluster: the L1688 {Rho Oph} Protostellar Region)

       The Near Infrared Camera (Camera Three) was used to make
observations protostellar region of the nearest young cluster L1688
(Positions 5,6 and 7) ( a.k.a., Rho Oph).  This cluster is unique in its
proximity to Earth, only 125 pc away; and in its high proportion of
optically invisible protostars.  The observations were executed as
scheduled, and no anomalies were noted.

   1.12 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 Q1029-0125.  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.

   1.13 Completed 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.

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

       The Near Infrared Camera (Camera Three) was used to make
observations of standard star P330E-CAL 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.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 31
                                        Successful : 31

                          Scheduled Reacquisitions : 18
                                        Successful : 18

       HSTAR 65647 documents that the guide star acquisition at 170/122907Z
defaulted to fine lock backup on FGS-3 when the scan step limit on FGS-1
was exceeded.  The proposal detailed in 1.6 may have been affected.

   2.2 FHST Updates:

                              Scheduled : 54
                             Successful : 54

   2.3 Operations Notes:

       Per operations request, real-time FHST maps were performed four times.

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

       Per Operations Note 446, the DF-224 was successfully dumped to the
CCS A and B strings at 171/0452Z, 171/1526Z, 172/0336Z, 172/2002Z, and
173/0122Z.

       The ground master image was updated at 172/0411Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH