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HUBBLE SPACE TELESCOPE

DAILY REPORT #2419

PERIOD COVERED: 0000Z (UTC) 07/21/99 - 0000Z (UTC) 07/22/99

Daily Status Report as of 203/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two WF/PC-2 8443 (WF/PC-2 Cycle-8 Supplemental Darks pt1/3)

The WF/PC-2 was used to obtain 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 problems were reported.

1.2 Completed STIS/CCD 8408 (STIS CCD Dark Monitor C8)

The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation. This is to monitor the darks for the STIS CCD.
The observations were executed as scheduled, and no anomalies were reported.

1.3 Completed STIS/CCD 8409 (STIS CCD Bias Monitor C8)

The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation. This is to monitor the bias in the 1x1, 1x2,
2x1, and 2x2 bin settings at gain=1, and 1x1 at gain = 4, to build up high-S/N
superbiases and to track the evolution of hot columns. The observations were
executed as scheduled, and no anomalies were reported.

1.4 Completed WF/PC-2 7375 (Spiral Structure and OB Star Formation in M51)

The WF/PC-2 was used to make high resolution broadband and H-alpha
photometric images of dust lanes in M51, combined with radio maps of the same
regions, to determine local physical conditions.

1.5 Completed Two Sets of STIS/MA2 8426 (Cycle 8 MAMA Dark Measurements)
>>
The Space Telescope Imaging Spectrograph (MA2) was used to make a
routine Cycle-8 MAMA dark noise calibration measurement. This proposal will
provide the primary means of checking on the health of the MAMA detectors.
This is done through frequent monitoring of the background count rate. The
observations were completed as planned, and no problems were reported.

1.6 Completed Two Sets of STIS/CCD 8406 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations as part of a POMS proposal. This is a STIS non-scripted parallel
Condition V proposal. The observations were completed as scheduled, and no
anomalies were reported.

1.7 Completed WF/PC-2 8181 (Resolving Sirius-like Binaries)

The WF/PC-2 was to be used to make observations of the star HR1358 in
order to try and resolve these Sirius-like binary star systems. As reported
in 2.1 and HSTAR 7200, the acquisition for this proposal failed and the take
data flag remained down.

1.8 Completed WF/PC-2 6813 (The Oldest Star Clusters of Local Group
Irregular Galaxies)

The WF/PC-2 was used to make observations of the oldest star clusters
located in the irregular galaxies of the Local Group Galactic Cluster.
Globular clusters of spiral and elliptical galaxies are well- studied and they
have provided much information on the early histories of these types of
galaxies. For irregular galaxies, however, very little is known about the
globular clusters and other old clusters. The observations were executed as
scheduled, and no anomalies were noted.

1.9 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal - Nearby
Galaxies - Imaging and Spectroscopy)

The Space Telescope Imaging Spectrograph (CCD) was used to make parallel
observations of nearby galaxies. This survey will be useful to study the star
formation histories, chemical evolution, and distances to these galaxies.
These data will be placed immediately into the Hubble Data Archive. The
observations were completed as scheduled, and no problems were reported.

1.10 Completed STIS/MA1 7345 (Origin and Physical Conditions in the Local
Lyman-Alpha Forest)

The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of MRK926 in order to study the origin and physical conditions in
the local Lyman-Alpha forest. A wavelength calibration image was also taken.
The observations were executed as scheduled, and no anomalies were noted.

1.11 Completed Two Sets of 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.

1.12 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.

1.13 Completed STIS/CCD 8202 (Bright Quasar Close Lensing Search)

The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of HCLQ1235+5 as part of a second generation survey to search for
bright lensing quasars. With the restored PSF, new images will be considerably
more sensitive to the presence of both close separation and faint lens
components, and because STIS reaches two magnitudes fainter the PC, the new
snapshot images will have much greater dynamic range. The observations were
executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 6
Successful : 5

The acquisition scheduled for 202/112847Z failed when the search radius
limit was exceeded on FGS-1. HSTAR 7200 was written. The proposal detailed in
1.7 was affected.

Scheduled Reacquisitions : 10
Successful : 10

2.2 FHST Updates:

Scheduled : 17
Successful : 17

2.3 Operations Notes:

Using ROP SR-1, the SSR EDAC error counter was cleared twice.

The NICMOS FPA temperature for detector 3 was enabled.

The flight operations team transferred to the SAMS backup facility in
preparation for GSFC Internal Simulation #8 (EVA-3), which will be conducted
today in the MOR area.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH