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HUBBLE SPACE TELESCOPE

DAILY REPORT #1876

PERIOD COVERED: 0000Z (UTC) 05/12/97 - 0000Z (UTC) 05/13/97

Daily Status Report as of 133/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of WF/PC-2 6359 (Core Properties of the Bulges of
Spiral Galaxies)

The WF/PC-2 was used to make snapshot survey observations of spiral
galaxies NGC-5448 and NGC-4036 in order to study their central bulges. The
aim is to investigate the core properties, correlations with global
galactic properties, and the frequency of occurrence of multiple and/or
miscentered nuclei. The observations were completed as scheduled, and no
anomalies were noted.

1.2 Completed WF/PC-2 6785 (Ionized Gas Disks in Nearby Early Type Galaxies)

The WF/PC-2 was used to make observations of the nearby, early-type
galaxy NGC-4036 in order to study its ionized gas disk surrounding its
nucleus. Finding such disks could lead to the possibility of detecting the
gravitational effects of the supermassive black holes they orbit. The
guide star acquisition at 132/020825Z failed when the scan step limit was
exceeded. HSTAR 6062 was written. No further anomalies were noted.

1.3 Completed Three Sets of STIS/CCD 7092 (CCD Dark Rate and Read Noise)

Observations were taken to measure CCD dark current and gather data
for making super darks. The first iteration of this proposal was affected
by the acquisition failure mentioned in 1.2. Otherwise. the observations
were completed as planned, and no further anomalies were reported.

1.4 Completed Two Sets of WF/PC-2 7588 (Measuring Q0 With Type IA
Supernovae)

The WF/PC-2 was used to make observations of supernovae SN1997A1 and
SN1997A2 in order to measure the Q0 parameter. This is in order to produce
a precise Hubble diagram from which can be used to measure the cosmic
deceleration and global curvature of the universe. HST can make an
essential contribution by providing photometry with substantially higher
precision and better temporal coverage than can be obtained from the
ground. The observations were executed as scheduled, and no anomalies were
noted.

1.5 Completed NIC/1/2/3 7048 (NICMOS Parallel Thermal Background Test)

The Near Infrared Cameras (Cameras One, Two and Three) were used to
make observations of an object designated as Target-1 in order execute
measurements of the stability of the HST thermal emissions. The
observations were executed as scheduled, and no problems were reported.

1.6 Completed WF/PC-2 6906 (WF/PC-2 Cycle 6 Calibration: Internal
Monitor-Visual Flats)

The WF/PC-2 was used to make internal calibration visual flat images
as part of the Cycle 6 internal monitoring of the instrument's operations.
This proposal defines the standard series of internal flat fields, which
will be executed twice per month. The observations were completed as
planned, and no anomalies were reported.

1.7 Completed STIS/CCD 7147 (STIS Fine Corrector Alignment With CCD)

The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the standard star BD+28D4211 in order to perform a fine
corrector alignment with the CCDs such that the image quality at the slit
plane is optimized. The observations were completed as planned, and no
anomalies were reported.

1.8 Completed Two Sets of WF/PC-2 6802 (Cosmology With the Medium Deep
Survey)

The WF/PC-2 was used to make observations taken in parallel with the
prime science observations as part of the Medium Deep Sky Survey. During
the second iteration of this proposal, during a ZOE, there was a guide star
acquisition failure. The subsequent re-acquisition was successful. HSTAR
6065 was written. The observations were executed as scheduled, and no
problems were reported.

1.9 Completed Two Sets of WF/PC-2 7553 (Pure Parallel Archive Survey II)

WF/PC-2 parallel observations were obtained in the ultraviolet in
search for interesting objects. This program is designed to find
extragalactic sources with near ultraviolet excesses (3000 A0) outside the
galactic plane and far ultraviolet sources (1600 A0) in the galactic plane.
The procedure was executed as scheduled, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 11
Successful : 10

There was an acquisiton failure at 132/2312Z that is mentioned in
1.8 above.

Scheduled Reacquisitions : 10
Successful : 10

2.2 FHST Updates:

Scheduled : 11
Successful : 11

2.3 Operations Notes:

The STIS MAMA2 high voltage was turned on nominally, starting at
132/0812Z. The next turn-on is scheduled from 133/2000Z until 134/0851Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science and SMOV operations.

/DMH