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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