HUBBLE SPACE TELESCOPE

                        DAILY REPORT #2479

PERIOD COVERED:  0000Z (UTC) 10/14/99 - 0000Z (UTC) 10/15/99

Daily Status Report as of 288/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 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.

    1.2 Completed Three 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 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 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 HD92536 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.

    1.5 Completed WF/PC-2 8148 (Discrete Photometry of Galileo Mission 
Atmospheric Targets in Jupiter)

        The WF/PC-2 was used to make photometric observations of Jupiter's 
atmosphere.  This is to investigate the vertical aerosol structure of 
Jupiter's atmosphere, and its spatial and temporal variability, in 
conjunction with nearly simultaneous observations by the uniquely 
well-positioned but data-rate-limited Galileo Orbiter.  As described in 
yesterday's report and HSTAR 7311, there was an approximate 7-minute loss 
of lock that occurred about one-half hour into this almost nine-hour 
proposal.  The take data flag was down during this period, affecting one 
observation.  A little over three hours later the loss of lock described in 
2.1 and HSTAR 7312 occurred, affecting one observation.  Otherwise, the 
observations were executed as scheduled, and no further anomalies were noted.

    1.6 Completed WF/PC-2 8444 (WF/PC-2 CYCLE-8 Internal Monitor)

        The WF/PC-2 was used to make a bias, and an internal flat, 
observation as part of a Cycle-8 monitoring program to monitor the health 
of the cameras.  A variety of internal exposures are obtained in order to 
provide a monitor of the integrity of the CCD camera electronics in both 
bays {gain 7 and gain 15}, a test for quantum efficiency in the CCDs, and a 
monitor for possible buildup of contaminants on the CCD windows.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.7 Completed 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.

    1.8 Completed WF/PC-02 8131 (HST Imaging of Moderate Redshift X-ray 
Emitting Groups of Galaxies)

        The WF/PC-2 was used to make observations of the infrared and x-ray 
emitting galactic cluster Gal-Clus-0723.  Most galaxies in the universe, 
including our own Milky Way, are members of poor groups of 
galaxies.  Recent optical and X- ray observations of nearby groups have 
revealed considerable new insight into these important systems.  The 
observations were completed as scheduled, and no problems were reported.

    1.9 Completed STIS/CCD 8549 (POMS Test Proposal: STIS non-scripted 
parallel proposal continuation III)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
high galactic latitude observations as part of a non-scripted POMS Test 
Proposal. The observations were completed as scheduled, and no problems 
were reported.

    1.10 Completed WF/PC-2 8134 (Is the IMF Universal at Low Stellar Masses?)

    The WF/PC-2 was used to make observations of the cluster 
NGC-2172.  Only the HST can provide the resolution and limiting magnitude 
required to reach the low-mass end of the IMF at extragalactic 
distances.  The observations were executed as scheduled, and no problems 
were reported.

    1.11 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal - Nearby 
Galaxies - Imaging and Spectroscopy)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
parallel observations of nearby galaxies.  This survey will be useful to 
study the star formation histories, chemical evolution, and distances to 
these galaxies.  These data will be placed immediately into the Hubble Data 
Archive.  The observations were completed as scheduled, and no problems 
were reported.

    1.12 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 SZ-10 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.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:

                             Scheduled Acquisitions:  5
                                         Successful:  5

        As described in HSTAR 7313, the acquisition at 288/012014Z 
defaulted to fine lock back-up on FGS-3 only when the scan step limit for 
FGS-1 was exceeded.  Three proposals, occurring during the period of the 
next report, may have been affected: STIS 88342, two iterations of WF/PC-2 
8436, and STIS 8408.

                          Scheduled Re-acquisitions: 10
                                         Successful: 10

        Per HSTAR 7312, there was a loss of lock at 287/063444Z that lasted 
until 287/064028Z that occurred during a type 3 profile slew.  The proposal 
detailed in 1.5 was affected.

    2.2 FHST Updates:

                               Scheduled: 13
                              Successful: 13

    2.3 Operations Notes:

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

        An SI C&DH error was reset at 287/2021Z as directed by ROP NS-5.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/DMH