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HUBBLE SPACE TELESCOPE

DAILY REPORT #1901

PERIOD COVERED: 0000Z (UTC) 06/17/97 - 0000Z (UTC) 06/18/97

Daily Status Report as of 169/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Three Sets of NIC/1/2/3 7709 (NICMOS MULTIACCUM Dark
Characterization 7/8)

The purpose of this proposal is to obtain group 7 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7. The observations completed with no reported problems.

1.2 Completed Two Sets of NIC/1/2/3 7706 (NICMOS MULTIACCUM Dark
Characterization 4/8)

The purpose of this proposal is to obtain group 4 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7. The observations completed with no reported problems.

1.3 Completed WF/PC-2 5915 (Star Formation Histories of Dwarf Irregular
Galaxies)

The WF/PC-2 was used to make BVI observations for the isolated dwarf
irregular galaxy DD0155 (class dI) which is located in the local group in
order to study its star formation history. This data will be used to
create color-magnitude and color-color diagrams and maps of Population I
and II stars. The observations were executed as planned, and no problems
were reported.

1.4 Completed STIS/CCD 7700 (STIS Non-Scripted Parallel Archive Proposal)

The Space Telescope Imaging Telescope (CCD) was used to obtain
slitless spectroscopy with the G750L grism to search for emission line
galaxies at intermediate to high redshift. Field galaxy surveys have shown
that at high redshift most galaxies have strong emission lines, and are
compact and blue. This suggests that star formation rates were higher than
at present,and that AGN may have been more frequent. The low background
and high resolution of HST separates these objects from the background.
The proposal completed as planned, and no problems were reported.

1.5 Completed NIC/1/2/3 7710 (NICMOS MULTIACCUM Dark Characterization 8/8)

The purpose of this proposal is to obtain group 8 of the on-orbit
darks for the MULTIACCUM predefined sequences requested by GOs, before the
start of Cycle 7. The observations completed with no reported problems.

1.6 Completed Six Sets of STIS/MA2 7159 (NUVMAMA Dark Current vs. Time
>From SAA)

The Space Telescope Imaging Spectrograph (MA2) was used to make
calibration observations to measure current vs. time from the SAA. Early
SMOV observations indicate a higher background than seen on the ground.
This is thought to be due to cosmic-ray induced phosphoresence in the
NUV-MAMA window. The observations were executed as scheduled, and no
anomalies were noted.

1.7 Completed WF/PC-2 7507 (Determining Peculiar Motions by Observing
Cepheids at 3,000 KM/S)

The WF/PC-2 V-band observations were used to detect Cepheids in the
galaxy NGC 4603, which is believed to be in the Cen-30 cluster at a
redshift of 3,000 kms. These are the most distant Cepheids known. The
observations were completed as planned, and no anomalies were reported.

1.8 Completed Four Sets of NIC/1/2/3 7676 (NICMOS-One Orbit Parallel)

The Near Infrared Camera (Cameras One, Two and Three) was used to
conduct an on-orbit calibration procedure. This was none in parallel with
the prime science observations. The procedure was completed as scheduled,
and no anomalies were noted.

1.9 Completed WF/PC-2 6439 (Using Cepheid Based Distance to Test Large
Peculiar Motions)

The WF/PC-2 was used to make observations of the spiral galaxy
NGC-4603 which is located in the Centaurus galaxy cluster to look for
Cepheid variable stars to be used to measure the distance to the object,
which in turn will be used to study its large peculiar motions. If this
galaxy is a cluster member, as appears from secondary distance indicators,
then its peculiar velocity is inconsistent with that predicted from the
density field as reconstructed from the observational distribution of
galaxies in the cluster. The observations were executed as scheduled, and
no anomalies were reported.

1.10 Completed NIC/2 7330 (The Fueling of Active Nucleii: A NICMOS
Snapshot Survey)

The Near Infrared Camera (Camera Two) was used to probe the dark
matter distribution of NGC-3081 far from the center by observing
intervening absorption from the MgII doublet (lambda 2800) in the spectrum
of one background QSO located in a geometrically optimal position. HST
observations are required because this feature is in a wavelength range not
accessible from the ground, and the QSO magnitudes and expected strength of
absorption make IUE observations unfeasible. The proposal completed as
expected with no anomalies.

1.11 Completed WF/PC-2 6425 (UV-Visible Observations of Hot Stars in
Young Magellanic Cloud Star Clusters)

The WF/PC-2 was used to make far ultraviolet observations of
populous cluster NGC-330 which is located in the Small Magellanic Cloud.
The HST is essential for this project since only it provides both the
far-UV sensitivity needed for excellent temperature discrimination and the
high spatial resolution needed for photometry in these crowded cluster
fields. The observations were completed as planned, and no anomalies were
noted

1.12 Completed WF/PC-2 6640 (A Stellar Population Survey of the Nuclear
Region of M-33)

The WF/PC-2 was used to make observations of a stellar population
(NGC-533) which is located in galaxy M-33. Analysis of archival HST images
of the nuclear region of M-33 reveal that the old, red stars are more
centrally concentrated to the nucleus than the young star forming disk.
The observation were executed as planned, and no anomalies were reported.

1.13 Completed NIC/1/2 7701 (NICMOS Short One Orbit Parallel)

The Near Infrared Camera (Cameras One, Two and Three) was used as
part of a short NICMOS one orbit parallel program, to obtain "JHK" imaging
of sky regions when another instrument is prime. The observations were
completed as scheduled, and no anomalies were reported.

1.14 Completed WF/PC-2 6194 (WF/PC-2 Cycle 5: Polarization Proposal)

The WF/PC-2 was used to make polarization observations of star
BD+64D106 at for different spacecraft role angles. This should permit a
detailed and independent calibration of each polarizer quads. The
observations were executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 9
Successful : 9

Scheduled Reacquisitions : 7
Successful : 7

2.2 FHST Updates:

Scheduled : 16
Successful : 16

2.3 Operations Notes:

The SSR interrupt log was dumped at 168/1245Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science and SMOV operations.

/DMH