HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2051

PERIOD COVERED:  0000Z (UTC) 01/30/98 - 0000Z (UTC) 02/02/98

Daily Status Report as of 033/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Two Sets of STIS/MA1/MA2 7920 (STIS MAMA Pure Parallels
for NIC/3 HDF)

       The Space Telescope Imaging Spectrograph (MA1 and MA2) was used to
make parallel field, ultraviolet imaging to search for Lyman-break galaxies
at z>2.0, and z>1.0.  The observations were completed as planned, and no
problems were reported.

   1.2 Completed STIS/CCD 7711 (STIS CCD G750L Fringing Flats.)

       The Space Telescope Imaging Spectrograph (CCD) was used to
investigate and monitor the STIS CCD flat-field fringing in the G750L
grating at its nominal wavelength setting {7751A}.  WAVECALs were also
taken at the same gain and wavelength setting.  Typical S/N = 100 for each
integration, and gain = 4 on each.  The observations were executed as
scheduled with no noted anomalies.

   1.3 Completed NIC/3 7815 (NICMOS Earth Flats)

       The Near Infrared Camera (Camera Three) was used to make a Earth
flat field calibration image.  This proposal obtains a series of earth
flats for a subset of narrow and medium band NIC/3 filters in advance of
the NIC/3 campaign.  These flats will be used to generate the master flats
for narrow-band filters and to determine the OTA illumination pattern as a
function of wavelength.  The observations were completed as planned, and no
anomalies were reported.

   1.4 Completed Seven Sets of NIC/1/3 7813 (NIC/3 HDF Darks)

       The Near Infrared Camera (Cameras One and Three) was used to make
internal dark calibration images which will be used when processing the
Hubble Deep Field images during the first NICMOS Camera Three campaign.
The observations were executed as scheduled, and no anomalies were noted.

   1.5 Completed three Sets of NIC/3 7919 (NICMOS Camera 3 Campaign Snapshots)

       The Near Infrared Camera (Camera Three) was used to make images of
galaxies NGC-6684, NGC-4192 and NGC-628 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.

   1.6 Completed NIC/1/2/3 7217 (GRISM Survey of Three Young Clusters)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the young cluster called the Trapezium.  Although
photometric surveys have been used to great success in identifying members
of embedded star clusters, significant uncertainty surrounds the mapping of
broadband photometry with masses and ages of the stars.  The observations
were completed as planned, and no problems were reported.

   1.7 Completed 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 cluster J1-4423.  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, with no
anomalies.

   1.8 Completed Three Sets of NIC/1/2/3 7235 (Observations of the Hubble
Deep Field)

       The Near Infrared Camera (Cameras One, Two, and Three) was used to
make observations of the Hubble Deep Field area HDF-123645.  This program
observes a portion of the Hubble Deep Field with all three NICMOS cameras
in the F160W and F110W filters to produce infrared images equivalent in
depth to the existing WF/PC-2 HDF images.  The observations were executed
as scheduled, and no anomalies were noted.

   1.9 Completed STIS/CCD 7635 (STIS CCD Hot Pixel Annealing)

       The Space Telescope Imaging Spectrograph (CCD) was used to test the
hot pixel annealing procedure.  The effectiveness of the CCD hot pixel
annealing process is assessed by measuring the dark current behavior before
and after annealing and by searching for any window contamination effects.
The observations were completed as planned, and no problems were reported.

   1.10 Completed NIC/1 7693 (NICMOS Pupil Transfer Function)

       The Near Infrared Camera (Camera One) was used to make observations
of P177D in order to perform a pupil transfer function observations.  The
output of this program will be a two-dimensional surface fit that will give
the large scale corrections needed to flat-field the images to an accuracy
of about 2%.  Also, changes in the PSF will be measured as a function of
position within the cameras.  The observations were executed as scheduled,
and no anomalies were noted.

   1.11 Completed WF/PC-2 7620 (WF/PC-2 Cycle 7 Standard Darks)

       The WF/PC-2 was used to make a series of Cycle 7 standard dark
calibration images.  This dark calibration program obtains dark frames
every week in order to provide data for the ongoing calibration of the CCD
dark current rate, and to monitor and characterize the evolution of hot
pixels.  The observations were executed as scheduled, and no anomalies were
noted.

   1.12 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-6121 spanning 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.

   1.13 Completed Two Sets of WF/PC-2 7619 (WF/PC-2 Cycle 7 Decontamination)

       The WF/PC-2 was used to conduct a Cycle 7 decontamination procedure.
Ultraviolet-blocking contaminants were removed, and hot pixels cured, by
warming the CCDs to +20C for 6 hours.  A variety of internal images were
taken before and after the decontamination in order to verify its success
and to monitor the instrument health.  The procedures were conducted as
scheduled, and no problems were reported.

   1.14 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 DK-Tau 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.  As reported in 2.1, the initial acquisition for this proposal
defaulted to fine lock on one FGS, and one observation may have been
affected.  Otherwise, the observations were completed as scheduled, with no
anomalies.

   1.15 Completed NIC/1/2/3 7608 (NICMOS Focus Monitoring)

       The Near Infrared Cameras (Cameras One, Two, and Three) were used to
determine and monitor the optimal focus and tilt settings for all three
NICMOS cameras by making observations of cluster NGC-3603.  This proposal
is built to run NIC1/2/3 sweeps on a 2-week basis.  The observations
completed without incident with no reported anomalies.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 23
                                        Successful : 23

       The acquisition scheduled at 032/061207Z defaulted to fine lock on
FGS-1 only after FGS-3 had a scan step limit exceeded flag twice.  HSTAR
6332 was written.  The NIC/1/2/3 proposal described in 1.14 may have been
affected.

                          Scheduled Reacquisitions : 24
                                        Successful : 24

   2.2 FHST Updates:

                              Scheduled : 42
                             Successful : 42

   2.3 Operations Notes:

       This weekend, the NICMOS Hubble Deep Field (HDF) proposals executed
nominally, although the NIC/1/2/3 proposal 7456 (described in 1.14) did
have an initial acquisition that defaulted to fine lock on one FGS.  One
observation may have been affected.

       The completion of Sunday's activities marks the end of the
three-week HDF campaign.

       The ground master image was updated at 032/0701Z.

       Secondary mirror commanding was successfully performed at 032/1644Z.

       Per HSTAR 6334, at 033/010556Z a NICMOS EDAC error was reported.  No
other error flags or status buffer messages were received.  This NICMOS
internal log error was reset at 033/0433Z per ROP NS-11.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.
/DMH