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HUBBLE SPACE TELESCOPE

DAILY REPORT #2347

PERIOD COVERED: 0000Z (UTC) 04/08/99 - 0000Z (UTC) 04/09/99

Daily Status Report as of 099/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of WF/PC-2 7713 (WF/P-2 Cycle 7 Supplemental
Darks pt3/3)

The WF/PC-2 was used to make supplemental dark calibration images.
This dark calibration program obtains three dark frames every day to
provide data for monitoring and characterizing the evolution of hot pixels.
The observations were completed as planned, and no anomalies were noted.

1.2 Completed Three Sets of STIS/CCD 7949 (CCD Dark and Bias Monitor --
Cont. to June 99)

The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
CCD dark calibration and a bias monitoring program. It was also scheduled
to track the growth of hot pixels on the CCD in general and within the
various target acquisition apertures specifically. The observations were
executed as scheduled, and no anomalies were noted.

1.3 Completed WF/PC-2/STIS/CCD 7496 (Star Formation Histories of Dwarf
Irregular Galaxies II: the Old Populations of IC 1613 and Sextans A)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to make observations of the dwarf irregular galaxy DD075. Recent
results from the ground and from HST for different types of dwarf galaxies
show that even in these apparently simple stellar systems, a variety of
different star formation histories can be found. The observations were
executed as scheduled, and no anomalies were noted.

1.4 Completed WF/PC-2 7622 (WF/PC-2 Cycle 7 Internal Monitor)

The WF/PC-2 was used to make a set of Cycle 7 internal monitoring
calibration measurements. A variety of internal exposures are obtained in
order to provide a monitor of the integrity of the CCD camera electronics
in both bays {gain 7 and gain 15}, a test for quantum efficiency in the
CCDs, and a monitor for possible buildup of contaminants on the CCD
windows. A bias calibration and an internal flat calibration image were
also taken. The observations were executed as scheduled, and no anomalies
were noted.

1.5 Completed WF/PC-2 8053 (WF/PC-2 Cycle-7 Earth Flats -- Part II)

The WF/PC-2 was used to take Earth flat calibration images. This
proposal obtains 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.

1.6 Completed WF/PC-2 6967 (Blue Continuum Snapshots of 3CR Radio -
Continued Galaxies)

The WF/PC-2 was used to make observations of the radio galaxies
3C175.1 and 3C181.0. Radio galaxies are an important class of
extragalactic objects: they represent one of the most energetic
astrophysical phenomena and they may be used as probes of their
environments. They are unique probes of the early Universe. The
observations were completed as planned, and no problems were reported.

1.7 Completed STIS/CCD 8081 (STIS CCD Hot Pixel Annealing II)
[2-
The Space Telescope Imaging Spectrograph (CCD) was used to make a
dark and a bias calibration observation. The effectiveness of the CCD hot
pixel annealing process is assessed by measuring the dark current behavior
before and after annealing and by searching for any window contamination
effects. The observations were executed as scheduled, and no anomalies
were noted.

1.8 Completed WF/PC-2 8399 (Hubble Heritage observations of NGC 4650A)

The WF/PC-2 was used to make observations of NGC-4650 as part of the
Hubble Heritage observations. This object is a classic example of a polar
ring galaxy in which an outer disk orbits in approximately the polar plane
of an inner, high surface brightness S0 galaxy. Polar ring galaxies are
astrophysically important as highly visible examples of the effects of
interactions and/or gas capture in galaxy evolution. The observations were
executed as scheduled, and no anomalies were noted.

1.9 Completed Two Sets of STIS/CCD 8091 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude, non-scripted, parallel observations. The observations
were completed as planned, and no anomalies were noted.

1.10 Completed STIS/CCD 8393 (POMS Test Proposal: STIS Non-Scripted
Parallel Proposal Continuation IV)

The Space Telescope Imaging Spectrograph (CCD) was used to make
POMS, non-scripted, low galactic latitude observations made in parallel
with the prime science observations. The observations were executed as
scheduled, and no anomalies were noted.

1.11 Completed WF/PC-2 6790 (Mass Determination of QSOs Using
Gravitational Lensing)

The WF/PC-2 was used to make observations of quasar Q1148+0055 as
part of a program to measure the mass of quasar using the gravitational
lensing effect. Only four pairs of quasars with different redshifts and
angular separations smaller than 5'' are presently known. The observations
were completed as planned, and no problems were reported.

1.12 Completed STIS/CCD 8055 (Long Slit Spectroscopy of the Seyfert
Galaxies)

The Space Telescope Imaging Spectrograph (CCD) was used to make long
slit spectrographic observations of the Seyfert galaxy IRAS11058. These
observations are particularly important to detect and measure the mass
concentration associated with any central massive black hole. A wave
length calibrationThe observations were executed as scheduled, and no
anomalies were noted.

1.13 Completed 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.

2.0 FLIGHT OPERATIONS SUMMARY

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 5
Successful : 5

Scheduled Reacquisitions : 10
Successful : 10

2.2 FHST Updates:

Scheduled : 12
Successful : 12

2.3 Operations Notes:

There were no significant problems or event to report.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH