HUBBLE SPACE TELESCOPE

   DAILY REPORT #2682

PERIOD COVERED:  0000Z (UTC) 08/08/00 - 0000Z (UTC) 08/09/00

Daily Status Report as of 222/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed WF/PC-2/STIS/CCD 8196 (High Spatial Resolution UV/Optical 
Spectroscopy of H-II Regions in the Magellanic Clouds)

        Both the WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) 
were used to make high signal/noise, ultraviolet and optical observations 
of the H-II region in the Large Magellanic Cloud known as SMC/N66NW.  This 
is to make definitive measurements of the abundances of C and N, and to 
study the temperature, density, and ionization structures of the 
nebulae.  A wavelength calibration image was also taken.  The observations 
were executed as scheduled, and no anomalies were noted.

    1.2 Completed STIS/CCD 8663 (Survey of SMC Planetary Nebulae: Nebular 
and Stellar Evolution in a Low- Metallicity Environment)

        The Space Telescope Imaging Spectrograph (CCD) was used to survey 
of SMC planetary nebulae {PNe} in order to study the co-evolution of the 
nebulae and their central stars, in an environment that is chemically very 
metal poor.  We will obtain STIS imaging and medium-resolution slitless 
spectroscopy that will yield line fluxes and nebular morphologies in 
important emission lines, plus magnitudes of the central stars.  From these 
data we will gather a harvest of information: the nebular size, morphology, 
ionization structure, density, and mass; and the central star temperature, 
luminosity, and mass.  The proposal completed with no reported anomalies.

    1.3 Completed WF/PC-2 8059 (POMS Test Proposal: Targeted Parallel 
Archive Proposal)

        The WF/PC-2 was used to observe the parallel opportunities 
available 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.  Narrow-band images in F656N can be used both to identify 
young stars via their emission lines, and to map the gas distribution in 
star-forming regions.  The observations completed nominally.

    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 STIS/CCD 8700 (A STIS Spectroscopic Snapshot Survey of 
3CR Radio Galaxies : The Nature of the Unresolved Nuclei)

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
STIS snapshot long-slit spectroscopy of these nuclei over 2900- 10300 AA to 
classify them {QSO, NLRG, BLRG, BL Lac, ldots} and establish their AGN 
characteristics down to the lowest nuclear luminosities, while still within 
powerful 3C radio galaxies.  The primary goals are : {1} to test 
unification schemes by identifying previously undetected signatures of 
low-level AGN/QSO activity in their spectra in the form of weak, broad 
emission lines, featureless continua, and UV excess, {2} to constrain the 
FR I/BL Lac connection by measuring the relative contribution of thermal 
{starburst}, non-thermal {optical synchrotron}, and line emission, and {3} 
to perform line and continuum diagnostics to determine the dominant 
ionization mechanisms in the circumnuclear regions {tenths of arcseconds} 
and the role of dust extinction in the NLRGs and BLRGs in the form of 
geometrically thick or thin tori and foreground dust.  The proposal 
completed as planned, with no reported anomalies.

    1.6 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.

    1.7 Completed WF/PC-2 8250 (Proper Motions of Bulge Stars)

        The WF/PC-2 was used for second-epoch observations of two fields in 
the galactic bulge for proper motion measurements. These observations will 
allow velocities to be measured with an accuracy of 70km/s, sufficient to 
study the rotation properties of the bulge and disk in these fields, the 
vertical kinematics as a function of stellar type, and the presence of 
kinematic substructure such as might be caused by accretion of small 
satellites or dissolution of globular clusters.  The proposal completed as 
planned.

    1.8 Completed STIS/CCD 8808 (POMS Test Proposal: STIS Non-Scripted 
Parallel Proposal Continuation III)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
non-scripted, parallel observations as part of a POMS test proposal.  The 
observations completed with no anomalous activity.

    1.9 Completed STIS/CCD/MA1 8219 (A Definitive Census of the Cataclysmic 
Variable Population in 47 Tuc)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make deep, far-ultraviolet, time-resolved observations of the cataclysmic 
variable population in the globular cluster 47 Tuc (a.k.a., NGC-104).  A 
wavelength calibration image was also taken.  This proposal was affected by 
the losses of lock further documented in 2.1 and HSTAR 7782.  Otherwise, 
the observations were executed as scheduled, and no further anomalies were 
noted.

    1.10 Completed WF/PC-2 8826 (Cycle 9 Supplemental Darks pt 1)

        The WF/PC-2 was used to perform a T dark calibration program that 
obtains three dark frames every day in order to provide data for monitoring 
and characterizing the evolution of hot pixels.  This proposal was affected 
by the losses of lock further documented in 2.1 and HSTAR 7782.  Otherwise, 
there were no other reported anomalies.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 6
Successful: 5
  Scheduled Re-acquisitions: 4
Successful: 3

        As documented in HSTAR 7783, the acquisition at 222/0607Z and the 
re-acquisition at 222/0735Z failed when the search radius limit was 
exceeded.  An FHST map showed relatively low errors.  STIS proposal 8047, 
occurring during the period of the next report, was affected.

        Similar to the events related in HSTAR 7779, HSTAR 7782 describes 
multiple losses of lock (probably six) following a successful acquisition 
at 221/205645Z.  Proposals described in 1.9 and 1.10 were affected.

    2.2 FHST Updates:
Scheduled: 16
Successful: 16

    2.3 Operations Notes:

        A target of opportunity SMS was processed during the day for a 
return to the Comet Linear proposal last executed over the weekend.  On 
days 224 and 225, the proposal will occur three times.

        Using ROP SR-1A, the SSR EDAC error counter was cleared three times.

        SI C&DH errors were reset twice as directed by ROP NS-5.

        On three occasions the engineering status buffer limits were 
adjusted per ROP DF-18A.

        The ephemeris table was uplinked at 221/1405Z per ROP DT-07B

        Operations began using CCS string "G as the prime machine at 
221/2006Z.  Prime operations transitioned to the Science Institute at 
222/1000Z.

        The SSA transmitter was turned on and off at 222/0756Z using ROP IC-2.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        The return to the target of opportunity Comet Linear proposal on 
days 224 and 225.

        Continuation of normal science observations and calibrations.

/CAW