HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2377

PERIOD COVERED:  0000Z (UTC) 05/20/99 - 0000Z (UTC) 05/21/99

Daily Status Report as of 141/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Two Sets of STIS/CCD 7949 (CCD Dark and Bias Monitor --
Cont. to June 99)

       The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
CCD dark calibration and a bias monitoring program.  It was also scheduled
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 WF/PC-2 7624 (WF/PC-2 Cycle 7 UV Flats)

       The WF/PC-2 was used to make a set of ultraviolet calibration flat
images.  The ultraviolet flat fields will be obtained with the
cal-channel's ultraviolet lamp {UVFLAT} using the UV filter set {F122M,
F170W, F160BW, F185W, and F336W}.  The observations were executed as
scheduled, and no anomalies were noted.

   1.3 Completed Two Sets of WF/PC-2 7281 (Snapshot Survey of the B2 Sample
of Radio Galaxies)

       The WF/PC-2 was used to make snapshot survey observations of the B2
sample radio galaxies B2+1257+28 and B2+1256+28.  This program is aimed to
answer the following key questions: How common are extended nuclear disks?
What is their orientation and morphology?  How common are optical jets?
The observations were executed as scheduled, and no anomalies were noted.

   1.4 Completed Six Sets of STIS/CCD 8406 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

       The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations as part of a POMS proposal.  This is a STIS non-scripted
parallel Condition V proposal.  The observations were completed as
scheduled, and no anomalies were reported.

   1.5 Completed Three Sets of WF/PC-2 7621 (WF/PC-2 Cycle 7 Supplemental
Darks PT1/3)

       The WF/PC-2 was used to make supplemental dark calibration images.
This set of calibrations is intended to obtain three dark frames every day
to provide data for monitoring and characterizing the evolution of hot
pixels.  The acquisition for the final iteration of this proposal contained
the acquisition default to fine lock back-up on one FGS only, described in
yesterday's report and HSTAR 7137.  Otherwise, the observations were
executed as scheduled, and no further anomalies were noted.

   1.6 Completed STIS/MA1 8316 (The Lyman-Alpha Absorption Cross-Section of
Nearby Galaxies)

       The Space Telescope Imaging Spectrograph (MA1) was used to study the
Lyman-Alpha absorption cross-section of nearby galaxy MS10473+35.  The high
resolution of the spectra will allow us to accurately determine the
velocity of the gas, which can be compared to the systemic velocity of the
galaxy, and to the velocity field determined from 21 cm H-I emission
measurements, when available, enabling us to determine if or how the gas is
kinematically tied to the galaxy.  A wavelength calibration image was also
taken.  The observations were executed as scheduled, and no anomalies were
noted.

   1.7 Completed Two Sets of WF/PC-2 8441 (WF/PC-2 Decontaminations and
Associated Observations Pt. 1/2)

       The WF/PC-2 was used to make its monthly decontamination operations.
Also included are instrument monitors tied to decons: photometric stability
check, focus monitor, pre- and post-decon internals {bias, internal flats,
k-spots, & darks}, and ultraviolet throughput checks.  The observations
were executed as scheduled, and no anomalies were noted.

   1.8 Completed STIS/CCD/MA1 7295 (Galaxy Rotation Curves at Large Radius
using Lyman-alpha Absorption Lines)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make rotational spectrographic observations of the galaxy Mark110.  This is
to investigate the outer rotation curves of eight spiral galaxies at very
large galactocentric radii by using the kinematical information from
Lyman-alpha absorption lines in the spectra of background quasars.  A
wavelength calibration image was also taken.  The acquisition this proposal
contained an acquisition default to fine lock back-up on one FGS only,
described in yesterday's report and HSTAR 7137.  Also, during this
proposal, the MCE-1 reset at 140/0703Z, near the beginning of the
observations.  Otherwise, no further problems were reported.

   1.9 Completed STIS/CCD 7437 (Understanding High-Redshift and Starburst
Galaxies: A UV Spectroscopic Survey of O-Stars in the SMC)

       The Space Telescope Imaging Spectrograph (CCD) was  used to make
ultraviolet spectrographic observations of galaxy AV47.  The data from this
survey, of importance in many areas of astrophysics, will immediately be
made public as no proprietary period is requested.  A wavelength
calibration image was also taken.  The observations were executed as
scheduled, and no anomalies were noted.

   1.10 Completed WF/PC-2 8059 (POMS Test Proposal: WF-2 Targeted Parallel
Archive Proposal)

       The WF/PC-2 was used to make observations in parallel with the prime
science observations.  The parallel opportunities available with WF/PC-2 in
the neighborhood of bright galaxies are treated in a slightly different way
from the normal pure parallels.  Local group galaxies offer the opportunity
for a closer look at young stellar populations.  The observations were
completed as planned, and no anomalies were reported.

   1.11 Completed WF/PC-2 6833 (A Cepheid Search in the Virgo Cluster
Galaxy NGC 4571)

       The WF/PC-2 was used to make observations of the Virgo Cluster
galaxy NGC-4571 in order to search for Cepheid variable stars.  The
determination of the distance to the Virgo Cluster is key to establishing
the value of the H_zero.  The observations were completed as planned, and
no problems were reported.

   1.12 Completed Two Sets of WF/PC-2 8053 (WF/PC-2 Cycle-7 Earth Flats --
Part II)

       The WF/PC-2 was used to take Earth flat calibration images.  This
proposal obtains sequences of Earth streak flats to construct high quality
flat fields for the WF/PC-2 filter set.  The observations were executed as
scheduled, and no anomalies were noted.

   1.13 Completed STIS/CCD 8176 (Confirmation and Characterization of Brown
Dwarfs and Giant Planets from NICMOS 7226/7227)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
confirmation and characterization observations of object HR7329.  This is a
continuation of NICMOS 7226/7227 using the STIS.  A systematic search for
giant planet and brown dwarf companions to stars in the solar neighborhood
was the cornerstone of the NICMOS IDT's Environments of Nearby Stars {EONS}
program.  There was a Guide Star Failure {GSacq(1,3,3)} resulting in a
Finelock Backup {ie., (FL/BU)} at 140/1119Z lasting to 1726Z using FGS#3,
(3,0,3) due to a Scan Step Limit Exceeded on the primary.  No other
anomalies were reported. HSTAR 7139 was written.

   1.14 Completed WF/PC-2 7495 (Survey of Gravitational Lenses as
Cosmological Tools)

       The WF/PC-2 was used to make survey observations of object
MG1549+304 by obtaining deep, high-resolution images in the optical and
near IR in order to see if it is  gravitational lensed and could be used as
a cosmological tool.  The observations were executed as scheduled, and no
anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 09
                                        Successful : 09

   There was a Guide Star Failure {GSacq(1,3,3)} resulting in a Finelock
Backup {ie., (FL/BU)} at 140/1119Z lasting to 1726Z using FGS#3, (3,0,3)
due to a Scan Step Limit Exceeded on the primary. HSTAR 7139 was written.
See Operational item 1.13 (Proposal #8176).

                          Scheduled Reacquisitions : 06
                                        Successful : 06

   2.2 FHST Updates:

                              Scheduled : 23
                             Successful : 23

   2.3 Operations Notes:

       As a consequence of the MCE-1 reset, discussed in 1.8 and
yesterday's report, a STIS status buffer message was received at
140/084257Z.  This occurred at the time of the automatic recovery (via SMS
commanding) because of the high voltage ramp-up following the reset.  HSTAR
7138 was written to document this event.

       The Real-Time Operations continues from the SAMS Facility using PRS.

       A correctable EDAC error was cleared four times (ROP SR-1).

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH