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HUBBLE SPACE TELESCOPE

DAILY REPORT #1940

PERIOD COVERED: 0000Z (UTC) 08/12/97 - 0000Z (UTC) 08/13/97

Daily Status Report as of 225/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Three Sets of WF/PC-2 7621 (WF/PC-2 Cycle 7 Supplemental
Darks PT1/3)

The WF/PC-2 was used to make supplemental dark calibration images.
This set of dark calibrations is intended to obtain three dark frames every
day to provide data for monitoring and characterizing the evolution of hot
pixels. The observations were executed as scheduled, and no anomalies were
noted.

1.2 Completed STIS/CCD 7635 (STIS CCD Hot Pixel Annealing)

The Space Telescope Imaging Spectrograph (CCD) was used to test the
hot pixel annealing procedure. The effectiveness of procedure is assessed
by measuring the dark current behavior before and after annealing and by
searching for any window contamination effects. The observations were
completed as planned, and no problems were reported.

1.3 Completed Two Sets of NIC/2 7420 (A Near-Infrared Search for Very
Low Mass Companions to Stars Within 10 Parsecs of the Sun)

The Near Infrared Camera (Camera Two) was used to make searching
observations for very low mass companions to variable stars BD-12D4523 and
HD85512. These stars are known to be within 10 parsecs of the Sun. The
observations were executed as scheduled, and no anomalies were noted.

1.4 Completed STIS/CCD 7276 (Synoptic Monitoring of Seasonal Phenomena
on Mars)

The Space Telescope Imaging Spectrograph (CCD) was used to make
seasonal ultraviolet imaging of the planet Mars. This season includes the
formation of the north polar cap and hood system, a process which is not
well documented; the start of the classic dust storm season on Mars, when
large dust storms have often occurred; and an active cycle of small dust
storms in Hellas. These observations will complete a period of continuous
monitoring of Mars which commenced in Cycle 6. The observations were
completed as planned, and no problems were reported.

1.5 Completed Two Sets of NIC/1/2/3 7328 (High Resolution IR Imaging
Survey (IRIS) of the Centers of the Nearest Active Galaxies)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make high resolution infrared observations of the nearest active Markarian
galaxies NGC-5757 and IRAS1833-6 in order to study its inner nuclear
region. Observing in the near-IR minimizes the dust obstruction and
maximizes sensitivity to the old stellar population which dominates the
mass. A dark and a bias calibration observations were also taken. The
observations were executed as scheduled, and no anomalies were noted.

1.6 Completed NIC/2/3 7280 (Structures and Colors of the Oldest Galaxies
at Redshift 1.5)

The Near Infrared Camera (Cameras Two and Three) was used to make
observations of the structure and color of the oldest radio galaxies 53W069
which is located at a redshift of 1.5. This is the first high-redshift
galaxies for which detailed studies of stellar populations have proved
possible. The observations were executed as scheduled, and no anomalies
were noted.

1.7 Completed STIS/CCD 7636 (STIS Spectroscopic CCD Flatfielding)

The Space Telescope Imaging Spectroscope (CCD) was used to make a
CCD flat Field calibration observation in the spectrographic mode. A bias
calibration was also taken. The observations were completed as planned,
and no anomalies were reported.

1.8 Completed STIS/CCD/MA1/MA2 7673 (STIS MAMA Sensitivity and Focus
Monitor)

The Space Telescope Imaging Spectrograph (CCD/MA1/MA2) was used to
make observations of standard star GRW+70D582 in order to perform a MAMA
sensitivity and focus monitoring program. This is to monitor sensitivity
of each MAMA grating mode to detect any change due to contamination or
other causes. The observations were executed as scheduled, and no
anomalies were noted.

1.9 Completed NIC/2 7331 (Near-IR Properties of the Bulges of Spiral
Galaxies)

The Near Infrared Camera (Camera Two) was used to make infrared
observations of the bulge in spiral galaxy NGC-3259. Near-IR data at HST
resolution are essential for correcting for the effect of dust and will
enable us to derive robust nuclear properties for the sample. The
observations were executed as scheduled, and no anomalies were noted.

1.10 Completed WF/PC-2 6431 (Determination of the Extragalactric
Distance Scale)

The WF/PC-2 was used to make observations of the galaxy NGC-1326 to
be used in measuring the periods of Cepheid variable stars within this
galaxy. This will allow for a more accurate estimate of the distances to
these galaxies through the period-luminosity relation for the Cepheid
stars. The observations were executed as scheduled, and no anomalies were
noted.

1.11 Completed STIS/CCD 7782 (STIS Non-Scripted Parallel Archive
Proposal - Half Orbit)

The Space Telescope Imaging Spectrograph (CCD) was used for a
non-scripted parallel archive proposal (one-half orbit). The observations
were executed as scheduled, and no anomalies were noted.

1.12 Completed Three Sets of NIC/1/2/3 7726 (NICMOS One Orbit Parallel)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make a one orbit parallel calibration observations. The observations were
executed as scheduled, and no anomalies were noted.

1.13 Completed Six Sets of STIS/MA2 7604 (Cycle 7 MAMA Dark Measurements)

The Space Telescope Imaging Spectrograph (MA2) was used to make MAMA
dark measurements. These darks will be used in later image reductions and
also trended over the instrument's life time as an indicator of the
detector's degradation or damage. The observations were completed as
scheduled, and no problems were reported.

1.14 Completed NIC/1/2 7775 (NICMOS Earth Flats)

The Near Infrared Spectrograph Multi-Object Camera (NICMOS) was used
to make Earth flat calibration observations. This proposal obtains a
series of Earth flats for a subset of narrow-, medium-and broad-band NIC 1,
2 and 3 filters. These flats will be used to generate the master flats for
narrow-band filters and to determine the OTA illumination pattern as a
function of wavelength and camera. The observations were completed as
scheduled, and no problems were noted.

1.15 Completed NIC/1/2/3 7412 (An HST/NICMOS Search for Young Brown
Dwarfs and Giant Planets)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations taken in parallel with the prime science observations to
be part of a survey to look for large planets and/or small brown dwarf
stars which are in orbit around T-Tauri class stars. At an age of 2 to 20
million years these low-mass companions will be considerably brighter than
more evolved brown dwarfs or giant planets orbiting main-sequence stars,
and hence will be much easier to detect. The observations were completed
as planned, and no anomalies were noted.

1.16 Completed NIC/1/2/3 7608 (NICMOS Focus Monitoring)

The Near Infrared Camera (Cameras One, Two, and Three) was used to
determine and monitor the optimal focus and tilt settings for all three
NICMOS cameras by making imagesof the cluster NGC-3603. This proposal is
built to run NIC1/2/3 sweeps on a 2-week basis. During this proposal, at
224/200032Z and at 224/220340Z, an acquisition and a re-acquisition
defaulted to fine lock backup on one FGS only. HSTARs 6148 and 6149 were
written. No effect on science was reported. Otherwise, the observations
completed without incident with no reported anomalies.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 8
Successful : 8

Scheduled Reacquisitions : 12
Successful : 12

As described in 1.16, one acquisition and one reacquisition
defaulted to fine lock one one FGS only.

2.2 FHST Updates:

Scheduled : 16
Successful : 16

2.3 Operations Notes:



3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH