HUBBLE SPACE TELESCOPE

   DAILY REPORT #2620

PERIOD COVERED:  0000Z (UTC) 05/09/00 - 0000Z (UTC) 05/10/00

Daily Status Report as of 131/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed STIS/CCD/MA1) 8040 (Dynamics and Energetics of Stellar 
Flares)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
perform Mode 1.3 echelle spectra will be used to explore the dynamics and 
energetics of flares on M dwarfs.  The observations completed with no 
reported problems.

    1.2 Completed Two Sets of WF/PC-2 8805 (POMS Test Proposal: WFII 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used to perform a generic target version of the 
WFPC2 Archival Pure Parallel program.  The program will be used to take 
parallel images of random areas of the sky, following the recommendations 
of the Parallels Working.  The proposal completed with no reported problems.

    1.3 Completed Four Sets of 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.

    1.4 Completed STIS/CCD 8439 (Bias Monitor-Part 2 C8)

        The Space Telescope Imaging Spectrograph (CCD) was used 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 track the evolution of hot 
columns.  The proposal completed with no reported problems.

    1.5 Completed WF/PC-2/STIS/CCD 8119 (Measuring The Black Hole Mass In 
Centaurus A, The Nearest Active Galaxy)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were 
used to measure the mass of the black hole at the center of NGC5128 {Cen 
A}, the nearest active galaxy.  The presence of a super-massive black hole, 
comparable to that of M87, is suggested by the jet, the extent of the radio 
lobes, and the presence of strong nuclear radiation extending to hard 
X-rays and Gamma-rays.  The observations completed with no reported anomalies.

    1.6 Completed WF/PC-2 8325 (Galaxy Evolution in Low-Density 
Environments: WFPC2 Imaging of Poor X-Ray Clusters at z=0.2-0.3)

        The WF/PC-2 was used to obtain high quality morphological 
information on galaxies within nine X-ray-selected poor clusters at 
z=0.2-0.3. These morphologies will be combined with information on the 
stellar populations of the galaxies from our on-going spectroscopic survey 
of these systems to provide a complete view of the morphological and 
spectral evolution of galaxies within these clusters.   The observations 
completed nominally.

    1.7 Completed 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.

    1.8 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.

    1.9 Completed WF/PC-2 8199 (Local Cosmology: The Nearby Flow Field and 
its Structure)

        The WF/PC-2 was used to make observations of the galaxy CENA-NUC in 
order to study its nearby flow field and structure.  Very little data are 
available to constrain the velocity field of galaxies in the local 
neighborhood {<= 500 km/sec}.  The observations were executed as scheduled, 
and no anomalies were noted.

    1.10 Completed STIS/CCD 8489 (Searching for the Hydrogen Reionization 
Edge of the Universe at 5HST)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
36 parallel orbits {4--5 fields of 5--8 orbits each} to constrain the H 
Lyman-edge in emission that marks the transition from a neutral to a fully 
ionized IGM.  This edge is due to recombination from the H Lyman series and 
Lyman continuum, and can be used to constrain zion, one of the most 
important unknown quantities in large scale structure and cosmology.  The 
proposal completed nominally.

    1.11 Completed STIS/CCD 8128 (Stalking FLIERs in Planetary Nebualae: a 
STIS Study)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
FLIERs, which  are enigmatic pairs of small, low-ionization knots located 
on opposite sides of the central star of many PNe.  Their symmetric 
locations, equal, opposite and supersonic Doppler shifts {Mach 3-5}, and 
highly enriched N/O ratios suggest that they are peculiar spitballs ejected 
recently from the stellar interior.  The observations completed nominally.

    1.12 Completed Two Sets of WF/PC-2 8442 (Cycle 8 Standard Darks)

        The WF/PC-2 was used to obtain dark calibration dark frames every 
week in order to provide data for the ongoing calibration of the CCD dark 
current rate, and to monitor and characterize the evolution of hot 
pixels.  Over an extended period these data will also provide a monitor of
radiation damage to the CCDs.  The proposal completed with no reported 
anomalies.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 6
Successful: 6

  Scheduled Re-acquisitions: 9
Successful: 9

    2.2 FHST Updates:
Scheduled: 13
Successful: 13

    2.3 Operations Notes:

        SSA transmitter #1 was turned on and off at 130/1053Z per ROP IC-2.

        The ephemerides were uplinked on CCS strings "B" and "C".

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW