HUBBLE SPACE TELESCOPE

   DAILY REPORT #2592

PERIOD COVERED:  0000Z (UTC) 03/30/00 - 0000Z (UTC) 03/31/00

Daily Status Report as of 091/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed WF/PC-2 8460 (Cycle 8 Supplemental Darks pt2/3)

        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 completed with no reported problems.

    1.2 Completed STIS/CCD/MA1 8273 (The Oxygen Abundance in Translucent 
Interstellar Clouds)

        The Space Telescope Imaging Telescope (CCD and MA1) was used to 
obtain high-resolution STIS echelle observations of the interstellar O I 
Lambda1356 absorption toward a sample of stars behind six translucent 
clouds characterized by large H I column densities and high 
extinctions.  Previous GHRS measurements of this weak feature in diffuse 
clouds have shown no evidence of density-dependent O depletion from the gas 
phase and indicate a total {gas + dust} interstellar O abundance that is 
about 2/3 of the solar value.  The observations were completed nominally.

    1.3 Completed WF/PC-2 8121 (Proper Motions and Variability of HH 
Objects Near the Orion Nebula)

        The WF/PC-2 was used to observe the Orion nebula, which possesses 
at least three systems of HH objects, each with very different 
characteristics.  No other source shows such a variety of outflow 
phenomena, and the proposers seek to understand why this is so.  The 
proposal completed with no reported problems.

    1.4 Completed Two Sets of STIS/CCD 8549 (POMS Test Proposal: 
Non-Scripted Parallel Proposal Continuation I)

        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.

    1.5 Completed Two Sets of STIS/CCD 8437 (Dark Monitor-Part 2 C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the darks.  The proposal completed nominally

    1.6 Completed STIS/CCD 8217 (Tests of Stellar Models Using Four 
Extremely Massive Spectroscopic Binaries in the R136 Cluster)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
four non-interacting double-lined spectroscopic binaries discovered in the 
R136 cluster by the Cycle 6 FOS spectroscopy.  The proposal completed 
nominally.

    1.7 Completed Five 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.

    1.8 Completed Two Sets of WF/PC-2 8230 (Snapshot Survey of Dynamically 
Close Galaxy Pairs from z=0.1 to z=0.5)

        The WF/PC-2 was used to make snapshot survey observations of 
galactic cluster Gal-Clus-1.  This is to obtain snapshot images of a large, 
well-defined, and dynamically selected sample of close galaxy pairs at 
moderate redshift.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.9 Completed STIS/CCD/MA1 8284 (Deep STIS Observations of BALQSO PG 
0946+301)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
study AGN outflows to determine of the ionization equilibrium and 
abundances (IEA) in broad absorption line {BAL} QSOs.  In the last few 
years it has become clear that partial coverage of the continuum source and 
saturation are common in BALs, and these frustrate attempts to determine 
the IEA from available HST data because of limitations imposed by the S/N 
ratio and spectral coverage. We will re-observe the most suitable BAL IEA 
target: PG 0946+301.  The observation completed with no reported problems.

    1.10 Completed Two Sets of WF/PC-2 8445 (WF/PC-2 Cycle 8 Earth Flats)

        The WF/PC-2 was used to make Cycle 8 Earth flat calibration 
observations.  This is to obtain 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.

    1.11 Completed WF/PC-2 8457 (UV Earth Flats)

        The WF/PC-2 was used to obtain a series of Ultraviolet Earth 
flats.  The observations were completed with no reported problems.

    1.12 Completed STIS/CCD/MA1 8287 (A Search For Transparent Lines of 
Sight With Intergalactic He-II Absorption Towards 26 Bright z > 2.9 Quasars)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make He-II absorption line observations of quasar HS0901+132.  The aim is 
to identify more suitable bright objects for detailed studies of 
intergalactic He-II absorption at a redshift of Z <2.9 and >3.2 .  A 
wavelength calibration observation was also taken.  The observations were 
executed as scheduled, and no anomalies were noted.

    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 HD37367 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: 10
Successful: 10

  Scheduled Re-acquisitions:  8
Successful:  8

    2.2 FHST Updates:
Scheduled: 26
Successful: 26

    2.3 Operations Notes:

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

        Per HSTAR 7559, the battery #6 recharge ratio flagged out-of-limits 
high with a value of 1.32 (the upper limit is 1.25).  All six recharge 
ratios were higher than usual.

        At 090/205040Z, CCS string "A", OPS and Backbone began to 
periodically display the message: "Error Sending Response Message".  "A" 
string users began noticing that historical extracts were not executing, 
indicating "scheduled" in the Job Status display.  The Response Team 
reported that the APP server was not talking to the data server process on 
the Backbone.  Shortly after 090/220007Z, the problem apparently resolved 
itself, following a socket time-out and a re-connect.  HSTAR 7558 was written.

        Operations transferred to the CCS string "G" at 091/0607Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW