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HUBBLE SPACE TELESCOPE

DAILY REPORT #1774

PERIOD COVERED: 0000Z (UTC) 12/06/96 - 0000Z (UTC) 12/09/96

Daily Status Report as of 344/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed GHRS/1/FOS/BL 6448 (Ultraviolet Mapping of the Unique =
Polar HU-Aqr)

The High Resolution Spectrograph (Side One) and the Faint Object =
Spectrograph (Blue Side) both were used to make ultraviolet =
spectrographic observations of the unique, polar, eclipsing, magnetic, =
cataclysmic, star HU-Aqr. Observations will be made during all phases of =
the binary system. The observations were executed as scheduled and no =
anomalies were noted.

1.2 Completed Two Sets of FOS/BL 5755 (Observations of the Eclipsing =
Binary Millisecond Pulsar Science Observations of Program 2237)

The Faint Object Spectrograph (Blue Side) was used to make =
spectrographic observations of the 1.6 millisecond, eclipsing binary, =
pulsar system PSR1957+20. The optical counterpart is a 21st magnitude =
object which varies in intensity over the period of the system. In each =
iteration, at 341/120301Z and at 342/152322Z, about one-half hour into =
this approximate three-and-one-half hour proposal, an FOS status buffer =
message occurred indicating an FOS target acquisition failure. Each case =
had been anticipated by the STScI, and was corrected by a SIP offset =
request. HSTARs 5830 and 5833 were written. The observations were =
completed as scheduled, and no further problems were reported.

1.3 Completed Three Sets of WF/PC-2 6253 (Pure Parallel Archive =
Program)

The WF/PC-2 was used to execute a pure parallel program taking =
ultraviolet observations running concurrently with prime science =
observations. The intent is to search for extra-galactic sources with =
flux excesses at 3000 A0 and galactic sources with excesses at 1600 A0. =
The observations were completed as planned, and no problems were =
reported.

1.4 Completed FOS/RD 6585 (UV Spectra of Representative Stellar =
Populations of Age > 2)

The Faint Object Spectrograph (Red Side) was used to make =
mid-ultraviolet spectrographic observations of nuclear region of nearby =
galaxy NGC-3608. This galaxy has a relatively old stellar population. =
The objective is to fill in crucial gaps in our understanding of stellar =
populations, and thus aid in the modeling of galactic evolution. The =
observations were completed as planned, and no anomalies were reported.

1.5 Completed Two Sets of WF/PC-2 7202 (The WF/PC-2 B Band Parallel =
Survey: A Systematic and Synoptic Study of Galaxy Formation and Evolution =
- Short Orbit Case)

The WF/PC-2 was used to make observations as part of a B-Band =
Survey to make synoptic study of galaxy formation and evolution. These =
observations were taken in parallel with the prime science observations. =
They were completed as planned, and no anomalies were reported.

1.6 Completed Two Sets of FOS/RD 6911 (FOS Cycle 6: Discriminator =
Test)

The Faint Object Spectrograph (Red Side) was used to make internal =
flat and a dark calibration images as part of a Cycle 6 optimal =
discriminator setting test. This must be done because the noise and gain =
are both known to be temperature sensitive. The observations were =
executed as scheduled, and no anomalies were noted.

1.7 Completed FGS 6764 (Detection and Mass Determination of Low Mass =
Companions)

The FGSs were used in both the TRANS and POS modes to make =
astrometric measurements of nearby, dwarf, M class star GL791 in order to =
measure the mass of its possible low mass companion. The intent is to =
improve the mass-luminosity relation for the cool end of the main =
sequence. The observations were executed as scheduled, and no anomalies =
were noted.

1.8 Completed WF/PC-2 6096 (NGC-2363: Anatomy of a Two- Stage Star =
Burst)

The WF/PC-2 was used to make observations of the two-stage star =
bursting region (NGC-2363) located in galaxy NGC-2366. This H II region =
is associated with two star clusters that ionize the gas and supply the =
kinetic energy to the nebula. The observations were completed as =
planned, and no problems were reported.

1.9 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. =
The observations were executed as scheduled, and no problems were =
reported.

1.10 Completed WF/PC-2 6713 (Geometric Measurement of Galaxy Distance)

The WF/PC-2 was used to make observations of supernova remnant =
SN1991T in order to make a distance calibration for the galaxy in which =
it is located. The supernova is being used as a powerful new geometric =
method for the determination of a galaxy's distance, by obtaining high =
spatial resolution imageing polarization of the candidate supernova light =
echoes. The observations were completed as planned, and no anomalies =
were reported.

1.11 Completed FOS/BL 6605 (Ultraviolet Pulsations in WZ Sagitta)

The Faint Object Spectrograph (Blue Side) was used to make =
ultraviolet spectrographic observations of the variable star WZ-Sge. This =
star is one of the most famous and extensively studied cataclysmic =
variables. The observations were completed as planned, and no problems =
were reported.

1.12 Completed WF/PC-2 6366 (The Early Onset of Asymmetric Outflow =
During the Planetary Nebula formation)

The WF/PC-2 was used to make observations of the planetary nebula =
HD111166 in order to study its asymmetric outflow during its formation. =
The purpose of these exposures was to determine the characteristics of =
the mass loss that occurs as a star leaves the asymptotic giant branch. =
The observations were completed as planned, and no problems were =
reported.

1.13 Completed FOS/RD 6616 (UV Spectroscopy of Nearby Powerful Radio =
Galaxies)

The Faint Object Spectrograph (Red Side) was used to make =
ultraviolet spectrographic observations of the powerful, nearby (i.e., =
low redshift) radio galaxy 3C234. This is to test the validity of the =
unification model of powerful radio-loud AGNs. Also, it will help =
understand the origin of the scattered radiation and the nature of the =
scattered particles. The observations were completed as planned, and no =
problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 12
Successful : 12

Scheduled Reacquisitions : 28
Successful : 28

2.2 FHST Updates:

Scheduled : 33
Successful : 33

2.3 Operations Notes:

Aside from several temperature limit violations, expected at this =
time of the year, there were no operational problems.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Nothing at this time.

/DMH