HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2470

PERIOD COVERED:  0000Z (UTC) 10/01/99 - 0000Z (UTC) 10/04/99

Daily Status Report as of 277/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Five Sets of STIS/CCD 8408 (STIS CCD Dark Monitor C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation.  This is to monitor the darks for the STIS CCD. 
The observations were executed as scheduled, and no anomalies were reported.  

   1.2 Completed Eight Sets of WF/PC-2 8443 (WF/PC-2 Cycle-8 Supplemental Darks
pt1/3)

       The WF/PC-2 was used to obtain 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 problems were reported.  

   1.3 Completed Three Sets of STIS/CCD 8409 (STIS CCD Bias Monitor C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation.  This is to monitor the bias in the 1x1, 1x2,
2x1, and 2x2 bin settings at gain=1, and 1x1 at gain = 4, to build up high-S/N
superbiases and to track the evolution of hot columns.  The observations were
executed as scheduled, and no anomalies were reported.  

   1.4 Completed FGS 8529 (FGS 2 Pre-SM3a Decommissioning)

       The Fine Guidance Sensors were used to make observations of standard
source UPGREN69 as part of the FGS 2 Pre-SM-3A decommissioning.  FGS 2 will be
replaced during Servicing Mission 3a.  The unit will be reconditioned on the
ground to provide FGS 3R during the fourth Servicing Mission.  These
observations will provide a baseline for the ground system tests and
refurbishment.  It will also support assessment of the FGS optical train
alignment in zero G.  The observations were executed as scheduled, and no
anomalies were noted.  

   1.5 Completed Eleven 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.  

   1.6 Completed Twelve 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 observations were executed as
scheduled, and no anomalies were noted.  

   1.7 Completed STIS/CCD 7378 (Narrow Band Imaging of Jets and Bipolar
Outflows From Symbiotic Stars)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the symbiotic star HD182917 to make narrow band imaging of its
jets and bipolar outflows.  With these HST observations we have the unique
opportunity to follow in real-time the spatial evolution of the outflows {on a
time basis of very few years}, and therefore to derive 3-D dynamical models of
their structure.  The observations were completed as scheduled, and no problems
were reported.  

   1.8 Completed STIS/CCD 8313 (Imaging the Host Galaxies of High Redshift Type
Ia Supernovae)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of 94351 and its host galaxy.  The propose is to obtain snapshot,
unfiltered STIS images of distant galaxies of known redshift which have hosted
supernovae {SNe} of Type IA found via the Supernova Cosmology Project.  The
observations were completed as scheduled, and no anomalies were reported.  

   1.9 Completed WF/PC-2 8436 (POMS Test Proposal: WFII Backup Parallel Archive
Proposal II)

       The WF/PC-2 was used to make archive observations parallel to the prime
science observations as part of a POMS test proposal.  This is a POMS test
proposal designed to simulate scientific plans.  The observations were
completed as planned, and no anomalies were reported. 

   1.10 Completed STIS/CCD/MA1 7481 (The Wind-momentum Luminosity Relationship
for M31 and M33 B-supergiants)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
observations of the B class supergiant star M-31-OB10 which is located in the
M-31 galaxy.  The purpose of these observations is to acquire STIS
low-resolution ultraviolet spectra of early B-supergiants in galaxies M31 and
M33 to determine the terminal velocities of their stellar winds.  The
observations were completed as planned, and no anomalies were reported.  

   1.11 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.  

   1.12 Completed WF/PC-2/STIS/CCD/MA1/MA2 8207 (The Ofpe/WN Stars In M33:
Understanding Wolf-Rayet Star Formation In Different Environments)

       Both WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD, MA1 and
MA2) were used to make observations of Wolf-Rayet stars in the galaxy M-33. 
WF/PC-2 imaging parallel to the primary spectroscopy in UBV and FUV filters
will substantially extend our study of the hot massive star population and
populous stellar clusters in this galaxy.  A wavelength calibration image was
also taken.  The observations were completed as planned, and no anomalies were
reported.  

   1.13 Completed STIS/MA1/MA2 8144 (UV Spectroscopic Snapshots of FUSE AGN
Targets)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used to
make far ultraviolet spectrographic snapshot observations of the FUSE AGN
target PG0052+251.  This object is currently scheduled to be observed by the
Far Ultraviolet Spectroscopic Explorer {FUSE}.  The observations were executed
as scheduled, and no anomalies were noted.  

   1.14 Completed STIS/MA1 8424 (MAMA Sensitivity and Focus Monitor C8)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of object GRW+70D582 in order to measure the sensitivity and to
focus monitor C8.  This also is to monitor sensitivity of each MAMA grating
mode to detect any change due to contamination or other causes, and to monitor
the STIS focus in a spectroscopic mode.  A wavelength calibration was also
taken.  The observations were completed as planned, and no anomalies were
reported.  

   1.15 Completed STIS/CCD 8238 (Collimated Jets and Low Velocity Forbidden
Emission from T Tauri Stars)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the T-Tauri class star HN-Tau and to study its collimated jets
and low velocity forbidden emission lines.  This is a program of slitless
spectroscopy to image both the low velocity component {LVC} and high velocity
component of forbidden line emission in single and binary low mass stars
undergoing disk accretion.  A calibration CCD flat image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.  

   1.16 Completed Two Sets of FGS 8309 (A Link Between Massive Binary Stars and
Non-thermal Radio Emission)

       The Fine Guidance Sensors were used to make astrometric observations of
the massive Wolf-Rayet binary star WR24 and several nearby reference stars. 
Non-thermal radio emission in Wolf-Rayet stars is explained in terms of
synchrotron emission from shocks in the stellar wind.  The observations were
executed as scheduled, and no anomalies were noted.  

   1.17 Completed WF/PC-2 6752 (Global Mapping of the Opposition Surge on the
Galilean Satellites)

       The WF/PC-2 was used to make observations of Jupiter’s moons Ganyemede,
Io, Europa and Callisto.  This is to construct ~200 km resolution global maps
of the opposition brightness surge for each of the four Galilean satellites to
support and complement Galileo mission science investigations.  The
observations were executed as scheduled, and no anomalies were noted.  

   1.18 Completed WF/PC-2 7405 (A WF/PC-2 Search for Surviving Binary
Companions in SN Ia Remnants)

       The WF/PC-2 was used to search for binary companions in the class Ia
super nova remnant Tycho-SNR.  Type Ia supernovae {SNe Ia} are widely believed
to be explosions of white dwarfs undergoing binary mass accretion.  The
observations were completed as planned, and no anomalies were reported.  

   1.19 Completed Two Sets of STIS/CCD 8545 (POMS Test Proposal: STIS
non-scripted parallel proposal continuation VI)

       The Space Telescope Imaging Spectrograph (CCD) was used to make low
galactic latitude, non-scripted parallel observations as part of a POMS test
proposal.  The observations were completed as planned, and no anomalies were
reported.  

   1.20 Completed Two Sets of WF/PC-2 8455 (WFPC2 Cycle 8: Photometry of Very
Red Stars)

       The WF/PC-2 was used to make observations of the very red stars VB10 and
VB8.  This is to verify the photometric calibration of WF/PC-2 filters and
obtain estimated color terms for late M stars.  The observations were completed
as scheduled, and no anomalies were noted.  

   1.21 Completed Two Sets of WF/PC-2 8457 (UV Earthflats)

       The WF/PC-2 was used to make a ultraviolet Earth flat calibration
image.  This is to improve the quality of pipeline the ultraviolet flatfields. 
The observations were completed as scheduled, and no problems were reported.  

   1.22 Completed WF/PC-2 8216 (T Tauri Star Snapshot Survey II. Completing the
CTTs Sample)

       The WF/PC-2 was used to make observations of the T-Tauri class star
known as HO-Tau as part of Snapshot Survey II.  This database will be of
fundamental importance to understanding the nature of planet-forming
environments and their frequency in the galaxy.  The observations were executed
as scheduled, and no anomalies were noted.  

   1.23 Completed STIS/MA1 7353 (Spectra to Constrain the Dynamics of Clouds in
the Narrow-Line Region of NGC 1068)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of the narrow line regions in the  Seyfert galaxy NGC-1068.  The
results will provide important constraints on more distant quasars whose
emission-line regions are too compact for HST and other high-resolution
telescopes to resolve, and which therefore possess far fewer dynamical
constraints from other wavebands.  A wavelength calibration image was also
taken.  The observations were executed as scheduled, and no anomalies were
noted.  

   1.24 Completed STIS/CCD 7272 (Helium Absorption by Protogalactic Gas)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of Q0302-0019.  These observations will provide substantially
improved S/N and substantially reduced geocoronal contamination compared with
extant GHRS spectra, providing a much more secure measure of both discrete
cloud and diffuse IGM contributions to the He-II opacity in this sightline. 
The observations were completed as planned, and no problems were reported.  

   1.25 Completed Two Sets of STIS/MA1 8426 (Cycle 8 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA1) was used to make a
routine Cycle-8 MAMA dark noise calibration measurement.  This proposal will
provide the primary means of checking on the health of the MAMA detectors. 
This is done through frequent monitoring of the background count rate.  The
observations were completed as planned, and no problems were reported.  

   1.26 Completed FGS 8528 (Pre-Servicing Baseline FGS3 Operational
Calibrations Check)

       The Fine Guidance Sensors were used to make astrometric observations of
the standard star MAC297 (et al.).  This proposal is used to obtain the
pre-SM-3A baseline data.  The observations were completed as scheduled, and no
problems were reported.  

   1.27 Completed STIS/CCD 8229 (Spatially Resolved Spectroscopy of Titan's
Atmosphere and Surface)

       The Space Telescope Imaging Spectrograph (CCD) was used to observe the
moon Titan.  The observations will measure the surface reflectivity of Titan at
0.9 microns, and map the distribution of haze in the northern and southern
hemispheres at altitudes where the haze is formed.  The proposal completed
nominally.

   1.28 Completed STIS/CCD 8418 (CCD Sensitivity Monitor C8)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of standard source AGK+81D266 as part of a CCD
sensitivity-monitoring program in Cycle-8.  The sensitivity of each CCD grating
mode is monitored to detect any change due to contamination or other causes.  A
wavelength calibration image was also taken.  The observations were completed
as planned, and no anomalies were reported.  

   1.29 Completed STIS/CCD 8236 (Black Holes and Gas Disks in a Complete Sample
of Radio-Loud Ellipticals - II: Kinematics)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the radio-loud elliptical galaxy NGC-193.  From these
observations we will measure the black hole masses, determine the nature,
kinematics, and structure of the central gas disks and obtain a modeled upper
limit to their mass accretion rates.  A wavelength calibration image was also
taken.  Approximately 15 minutes into this almost three-hour observation, the
MCE-2 reset described in 2.3 occurred.  Otherwise, the observations were
completed as planned, and no further problems were reported.  

   1.30 Completed STIS/MA1 8179 (The Composition and Evolution of Extremely Hot
DA White Dwarfs)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
ultraviolet observations of the extremely hot white dwarf star WD2218+706 in
order to study its composition and evolution.  This star has a temperature
range from 70,000 to 130,000 degrees K.  A wavelength calibration image was
also taken.  The observations were completed as planned, and no anomalies were
reported.  

   1.31 Completed STIS/CCD/MA2 7515 (UV-Optical Spectra and Imagery of the
Bubble Galaxy NGC 7635)

       The Space Telescope Imaging Spectrograph (CCD/MA2) was used to acquire
UV-optical STIS spectra and WFPC2 imagery of the wind-blown Bubble Nebula
NGC-7635.  The nebula's nearly spherical shell is the result of a recent { <
10^6 years} stellar mass-loss event and is the best young, clearly observed
bubble available for study.  The ionization front at the rim of the bubble will
be examined, and the extent to which it is shock-driven and the scale of the
photoevaporative flow off the face of the molecular cloud will be determined. 
The observations were completed as scheduled, with no reported problems.

   1.32 Completed FGS 8319 (Masses and Distances of Pre-Main Sequence Binaries)

       The Fine Guidance Sensors were used to make astrometric observations of
the pre-main sequence binary star system Elias-12.  Observations were also made
of several reference stars.  Our goal is to measure the masses of low mass
young stars.  This will enable a calibration of theoretical calculations of
stellar evolution to the main sequence.  The observations were completed as
planned and no problems were reported.  

   1.33 Completed Two Sets of WF/PC-2 8345 (Multipolar Bubbles and Jets in Very
Low Excitation Planetary Nebulae - A WF/PC-2 H-Alpha Imaging Survey)

       The WF/PC-2 was used to make H-Alpha observations of the very low
excitation planetary nebulae PK147-02D1 and PK258-00D1 in order to study its
multipolar bubbles and jets.  Comparison of the morphology of this young PNe
sample with more evolved PNe populations will set new constraints on models for
the production of jet-like outflows and nebular evolution.  The observations
were completed as planned, and no problems were reported.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions: 26
                                        Successful: 26

                         Scheduled Re-acquisitions: 15
                                        Successful: 15

   2.2 FHST Updates: 

                              Scheduled: 63
                             Successful: 62

       The FHST update at 274/20331Z failed.

   2.3 Operations Notes: 

       Analysis of the science and engineering data collected during the latter
stages of the STIS MAMA-2 recovery last week point to a healthy MAMA-2 detector
system ready to be used operationally.

       Using ROPS SR-1, the SSR EDAC error counter was cleared eight times.

       At the end of day 274, the STScI reported that they were unable to read
AEPD data, and that the PODPS system could not accept further data until the
problem was resolved.  Transmission of data to PODPS was suspended.

       Beginning at 275/0534Z, ESS began experiencing problems.  ESS-1 was
unsuccessfully recycled.  Then a reboot failed, and TMS real time data ingest
was impacted.  The problem was cleared by 275/1352Z.

       A full DF-224 memory dump was performed at 276/0307Z as directed by ROP
DF-1.

       Intermittent PRS connection problems to both the TAC and the PSP were
corrected by repair to the network transceiver.

       Per HSTAR 7290, the FHST maps at 276/0835Z and at 276/1008Z failed to
find stars in FHST-3.

       The STIS MAMA-2 reset at 276/080537Z while the high voltage was on and
while outside any SAA interval.  The proposal described in 1.29 was affected. 
The STIS flight software error counter was reset at 276/0847Z per ROP NS-12. 
The MAMA-2 was recovered via normal SMS commanding at 276/1647Z.  SI C&DH
errors were reset at 276/1743Z using ROP NS-5.

       As described in HSTAR 7292, the SSA return link from 276/0920Z until
276/1013Z experienced losses of lock during 2100 seconds of science data. 
There was no drop in output RF power, implying that there were portions of west
visibility  where lock cannot be maintained on 1 Mb data.  The data was
subsequently recovered nominally at 276/1149Z per ROP SR-3.

       At 276/101110Z battery 2 voltage flagged low at 27.636 volts; at
276/102121Z, battery 4 at the same voltage.  The limit for each parameter is
27.64 volts.  Both parameters remained out of limits for one telemetry sample. 
HSTAR 7291 was written.

       The NICMOS FPA temperature sensor for detector 2 was enabled at
277/0213Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH