HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2462

PERIOD COVERED:  0000Z (UTC) 09/21/99 - 0000Z (UTC) 09/22/99

Daily Status Report as of 265/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

   1.1 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 observations were executed as
scheduled, and no anomalies were noted.  

   1.2 Completed Two 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 Two 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.  

   1.4 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 DF-Tauri 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.  As
described in HSTAR 7268 and yesterday’s report, MAMA-2 low voltage was not
allowed to be turned on approximately one-half hour before the end of the
nearly four-hour proposal.  Otherwise, the observations were executed as
scheduled, and no further anomalies were noted.  

   1.5 Completed WF/PC-2 7371 (The White Dwarf Luminosity Function in NGC 188)

       The WF/PC-2 was used to study the white dwarf luminosity function in the
old open cluster NGC-188.  These data will be one of the first “complete”
samples of white dwarfs {in the sense of containing stars from the full cooling
sequence} all at a known distance, with similar compositions and derived from a
fairly well understood initial mass distribution.  The observations were
executed as scheduled, and no anomalies were noted.  

   1.6 Completed Two 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.  

   1.7 Completed 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.  

   1.8 Completed WF/PC-2 8192 (A Snapshot Survey of Probable Nearby Galaxies)
       The WF/PC-2 was used to make a snapshot survey images of a probable
nearby galaxy KK077.  The census of galaxies in the Local Volume of space is
very incomplete, particularly at the faint end.  The observations were executed
as scheduled, and no anomalies were noted  

   1.9 Completed WF/PC-2/STIS/MA2 8120 (Determination of Circumstellar Cloud
Mass Loss Rates with STIS Spectra)

       Both the WF/PC-2 and the Space Telescope Imaging Spectrograph (MA2) were
used to make observations of the star cluster NGC-1976 to determine its
circumstellar cloud mass loss rate.  Only the HST and STIS have the right
combination of spatial and spectral resolution to adequately reject the
contaminating light from the Orion Nebula itself and allow clear determination
of the emission coming from the young stellar object.  As documented in 2.1 and
HSTAR 7269, the acquisition for this proposal defaulted to fine lock on one FGS
only.  Otherwise, the observations were complete as planned, and no further
anomalies were reported.  

   1.10 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. 
As documented in 2.1 and HSTAR 7269, the acquisition for the first iteration of
this proposal defaulted to fine lock on one FGS only.  Otherwise, the
observations were completed as scheduled, and no further problems were
reported.  

   1.11 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.  As
documented in 2.1 and HSTAR 7269, the acquisition for the first iteration of
this proposal defaulted to fine lock on one FGS only.  Otherwise, the
observations were completed as planned, and no further problems were reported. 


   1.12 Completed STIS/CCD/MA1 8171 (HST Far-UV Imaging and Spectra of
Jupiter's Aurora During the Galileo Extended Mission)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
far-ultraviolet spectrographic observations of the aurora on the planet Jupiter
as part of the extended Galileo Mission.  Observations were also made of the
moon Europa.  This is to study the nature of the satellite auroral footprints
in Jupiter's atmosphere.  Approximately one hour into this four hour proposal,
a STIS 567 status buffer message was received, with a parameter = 22’O’ and
time of 65382.  The STIS error flag was set and the STIS error flag incremented
to ‘1’.  Otherwise, the observations were completed as planned, and no further
problems were reported.  

   1.13 Completed STIS/CCD/MA1 8241 (A Snapshot Survey of Interstellar
Absorption Lines)

       The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
high resolution Echelle spectrographic observations of the standard ultraviolet
star HD201908 as part of a snapshot survey of interstellar absorption lines.  A
wavelength calibration image was also taken.  The observations were executed as
scheduled, and no anomalies were noted.  

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions: 8
                                        Successful: 8

       As described in HSTAR 7269, the acquisition at 264/141122Z defaulted to
fine lock backup on FGS-1 only when FGS-3 exceeded the scan step limit.  A
second attempt at 264/141258Z also failed.  The proposals detailed in 1.9,
1.10, and 1.11 may have been affected.

                         Scheduled Re-acquisitions: 9
                                        Successful: 9

   2.2 FHST Updates: 

                              Scheduled: 19
                             Successful: 19

   2.3 Operations Notes: 

       The SSR EDAC error counter was cleared five times per ROP SR-1.

       A TTR was written when the GCMR capability was missing, starting at
264/1544Z, due to an NCC software problem.

       ROP NS-14 was utilized at 264/22010Z to manually recover the STIS MAMA
from the problems encountered yesterday.

       See 1.12 for the details of HSTAR 7270 (STIS 567 Status Buffer Message).

       During a T3 slew, at 264/222005Z, the FGS-2 star selector compensated
error A flagged out-of-limits low with a value of 10.24.  HSTAR 7271 was
written.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science observations and calibrations.

/DMH