HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2301

PERIOD COVERED:  0000Z (UTC) 02/03/99 - 0000Z (UTC) 02/04/99

Daily Status Report as of 035/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.

   1.2 Completed Two Sets of WF/PC-2 7713 (WF/P-2 Cycle 7 Supplemental
Darks pt3/3)

       The WF/PC-2 was used to make supplemental dark calibration images.
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 completed as planned, and no anomalies were noted.

   1.3 Completed WF/PC-2 6352 (Dwarf Elliptical Galaxy Snapshots)

       The WF/PC-2 was used to survey galaxy VCC1495, from a sample of 30
dwarf elliptical galaxies.  The observations were completed as planned, and
no anomalies were reported.

   1.4 Completed Four Sets of STIS/CCD 8091 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude, non-scripted, parallel observations.  The observations
were completed as planned, and no anomalies were noted.

   1.5 Completed Three Sets of STIS/CCD 8084 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
non-scripted parallel high galactic latitude observations as part of POMS
test proposal.  The observations were executed as scheduled, and no
anomalies were noted.

   1.6 Completed WF/PC-2 6344 (Low - Mass Binaries in the Hyades -
Completing the Survey)

       The WF/PC-2 was used to make observations of the low mass binary
star RHY326 (M-Class Dwarf Stars) which is located in the Hyades Cluster.
The observations were executed as scheduled, and no anomalies were noted.

   1.7 Completed WF/PC-2 8289 (Development and Evolution of YSO Outflows
and Jets)

       The WF/PC-2 was used to study the jets and YSO outflow from variable
star XZ-Tau in order to study its development and evolution.  The
observations were executed as scheduled, and no anomalies were noted.

   1.8 Completed STIS/CCD/MA1 7440 (Eclipse Mapping of the Touchstone
Binary System YY Gem)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make eclipse mapping observations of the touchstone eclipsing binary star
system YY-Gem.  Solar images clearly demonstrate that its atmosphere
consists not of homogeneous, temperature-stratified layers, but rather of
discrete structures on spatial scales ranging from <100 km to a large
fraction of the solar radius, non-uniformly distributed across the solar
disk.  A wavelength calibration image was also taken.  The observations
were completed as planned, and no anomalies were reported.

   1.9 Completed Two Sets of WF/PC-2 8090 (POMS Test Proposal: WF-II
Parallel Archive Proposal Continuation)

       The WF/PC-2 was used in the parallel mode to make some low galactic
latitude archive observations.  The program will be used to take parallel
images of random areas of the sky.  The acquisition failure described in
2.1 and HSTAR 6968 occurred during the first iteration of this proposal.
The take data flag remained down, affecting two observations.  Otherwise,
the observations were executed as scheduled, and no further anomalies were
noted.

   1.10 Completed STIS/CCD/MA1/MA2 7389 (Chromospheres and Transition
Layers in Hyades and Pleiades F stars)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used
to make observations of the F class star HD28033 which is located in the
Hyades star cluster.  This proposal seeks to obtain additional empirical
constraints on the heating mechanisms for stellar chromospheres, transition
layers and coronae.  The acquisition failure described in 2.1 and HSTAR
6968 occurred at the beginning of this proposal but, since the
re-acquisition was successful, only a part of the proposal was affected
(five observations).  Otherwise, the observations were completed as
planned, and no further problems were reported.

   1.11 Completed WF/PC-2 6347 (A Search for Jets in Planetary Nebulae)

       The WF/PC-2 was used to make observations of the planetary nebulae
(class PNe) M1-92 in order to search for the presence of possible narrow
jets.  The current model for PNe formation indicates that jets are an
unexpected phenomena, yet there is a growing body of circumstantial
evidence that suggests narrow jets are common feature in PNe.  The
observations were completed as scheduled, and no anomalies were noted.

   1.12 Completed WF/PC-2 7468 (Young Globular Clusters in Merger Remnants
-- Part 4)

       The WF/PC-2 was used to make observations of merging galaxy NGC-5018
to study its globular clusters.  Mergers seem to have played a major role
in determining the shapes and dynamics of E and S0 galaxies.  The
observations were executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 6
                                        Successful : 5

       The acquisition scheduled for 034/150932Z failed when the search
radius limit was exceeded on FGS-1.  HSTAR 6968 was written.  Previous FHST
updates had shown small errors.  An ARU/PRT was performed at 034/1626Z,
followed by a real-time map at 034/1631Z, and the following re-acquisition
was successful.  The proposals described in 1.9 and 1.10 were affected.

                          Scheduled Reacquisitions : 9
                                        Successful : 9

   2.2 FHST Updates:

                              Scheduled : 15
                             Successful : 15

   2.3 Operations Notes:

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

       Two TTRs were written for data inversions and for a data hit with
seven accompanying missing minor frames.

       There has been no significant change in the Gyro-3 bias trend.
Because the gyro does not appear to be stabilizing to a value consistent
with the remaining gyros (this was expected since that was the case with
Gyro-6 when it experienced a similar anomaly), Gyro-3 will not be placed
into the control loop until it obtains a nominal bias rate of approximately
0.003 arcseconds/second per day.  PCS engineers will continue to monitor
the bias trend and all other key performance measures.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH