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HUBBLE SPACE TELESCOPE

DAILY REPORT #1438

PERIOD COVERED: 0000Z (UTC) 07/21/95 - 0000Z (UTC) 07/24/95

Daily Status Report as of 205/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed GHRS/2 5854 (Cepheid Masses)

The High Resolution Spectrograph (Side Two) was used to make
observations of the blue, main sequence companion of Cepheid star HD15679 to
determine the mass of the system. The orbital radial velocity will be
measured to provide the mass ratio of the stars. A wavelength calibration
image was also taken. The observations were executed as scheduled, and no
anomalies were noted.

1.2 Completed WF/PC-2 5560 (WF/PC-2 Cycle 4 Calibration: Internal Monitor.
1)

The WF/PC-2 was used to make several internal bias, K-Spot, and flat
calibration observations to monitor the CCD camera electronics, the optical
alignment, and to check for contamination. The observations were completed
as planned, and no anomalies were noted.

1.3 Completed Two Sets of WF/PC-2 6310 (A Photometric Search for Planets
of Nearby Stars)

The WF/PC-2 was used to make photometric observations of the nearby
star HD128621 (aka, the Alpha, Beta Cent and Proxima Cent Complex) looking
for possible planets. The exposure times were calculated so that areas
beyond ~1.2 arc seconds from the central stars will not be saturated. During
the second set, the guide star acquisition failed to coarse track backup.
Otherwise, the observations were completed as planned, and no problems were
reported.

1.4 Completed WF/PC-2 6232 (Star Formation at the Edge)

The WF/PC-2 was used to make observations of the extreme late-type,
low surface brightness spiral galaxy F041056-33 which is known to have a very
compact nucleus. The galaxy is an interesting object because it might be an
intermediate type between an active galactic nuclei and an inactive galactic
nuclei. The observations were completed as planned, and no problems were
reported.

1.5 Completed Three Sets of WF/PC-2 6218 (Io's Surface, Atmosphere, and
Plasma Torus)

The WF/PC-2 was used to make observations of Jupiter's moon Io's
plasma torus to study structures which might not be visible in ground based
observations. For the first set, half of the data was lost when that data
was written past the end of the tape. This occurrence was documented in
HSTAR 5243, and is believed to be a scheduling issue. For the remaining
sets, the observations were completed as planned, and no other problems were
reported.

1.6 Completed FOC/96 5960 (Identifying the Polarization Seyfert 1 Mirror
in Markarian 463)

The Faint Object Camera (f/96) was used to make polarized light
observations of Markarian galaxy MARK463, which is a Class 2 Seyfert galaxy
that displays Seyfert Class 1 spectra in polarized light. The observations
were completed as scheduled, and no problems were reported.

1.7 Completed Two Sets of WF/PC-2 5975 (High Spectral Resolution Studies
of Z>4 Quasars)

The WF/PC-2 was used to make observations of Quasar GB1508+571 which
is known to have a redshift of greater the 4.0. The observed surface
brightness distribution of the protogalactic material surrounding these QSOs
will allow a constraint to be placed on both the QSO and galaxy formation.
The observations were executed as scheduled, and no problems were reported.

1.8 Completed WF/PC-2 5965 (Toward H_O: Relative Astrometry of the Lensing
Galaxy)

The WF/PC-2 was used to make observations of the quasi-stellar source
QSO-022105 which is the smallest known gravitationally lensed system. The
observations were completed as planned, and no problems were reported.

1.9 Completed WF/PC-2 5957 (Snapshot of 3CR Radio Galaxies)

The WF/PC-2 was used to make observations for radio galaxies 3C103.0,
3C445.0, 3C441.0 and 3C124.0 to study the morphology of these radio galaxies.
The observations were executed as scheduled, and no anomalies were noted.

1.10 Completed WF/PC-2 5490 (Exposing the Evolution of Distant Field
Galaxies: Imaging in Mid UV)

The WF/PC-2 was used to make observations of distant field galaxy
13HR-C. The objective is to study the morphology, interactions, and the star
formation regions. The observations were executed as scheduled, and no
anomalies were reported.

1.11 Completed WF/PC-2 5864 (Mass Loading Stellar Winds in Hydrogen-Poor
Planetary Nebulae)

The WF/PC-2 was used to make observations of the hydrogen-poor
planetary nebula IRAS15154 to study its stellar winds and the interaction
with the nebula. The observations were executed as scheduled, and no
anomalies were noted.

1.12 Completed WF/PC-2 6133 (The Most Massive Stars in the Magellanic
Clouds)

The WF/PC-2 was used to make observations of star SK-66D172 which is
known to be one of the most massive stars in the Magellanic clouds (maybe up
to 200 solar masses). It is not clear whether or not these objects are
single stars. The observations were completed as planned, and no problems
were reported.

1.13 Completed WF/PC-2 6294 (Determination of the Extragalactic Distance
Scale)

The WF/PC-2 was used to make observations of galaxy NGC-7331 to measure
the period of individual Cepheid stars to determine the extragalactic
distance scale. The observations were executed as scheduled, and no
anomalies were noted.

1.14 Completed FOS/BL 5349 (The UV Interstellar Extinction in M-31 and
M-33)

The Faint Object Spectrograph (Blue Side) was used to make
observations of star M-31/OB78-2 which are located in galaxy M-31 (aka, The
Andromeda Galaxy) to study interstellar extinction. The observations were
executed as scheduled, and no anomalies were noted.

1.15 Completed WF/PC-2 6223 (The Disks Around Young Stellar Objects)

The WF/PC-2 was used to study the disk around the young stellar object
HD283572 which is located in the Taurus-Auriga molecular cloud. This disk
was detected by a radio telescope, and is comparable to the estimated size of
the solar nebula about the time of planetary formation. The observations
were completed as planned, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 24
Successful : 24

At 204/184152Z, one acquisition failed to coarse track
backup. HSTAR 5242 was written to document the event.

Scheduled Reacquisitions : 24
Successful : 24

2.2 FHST Updates:

Scheduled : 55
Successful : 55

2.3 Operations Notes:

There were no significant problems reported this weekend.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Nothing at this time.

/DMH
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