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Subj: HST REPORT #885

Note:
Both the AP-5 and AP-7 computers where down with problems on the
operational system disk. This made the ALLIN1 and MAIL functions
inoperative on Wednesday May 12, 1993, and caused a delay in the
distribution of the daily report via the electronic mail.

HUBBLE SPACE TELESCOPE
DAILY REPORT #885

PERIOD COVERED: 0800 EST
Daily Status Report as of 132/1200Z.

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed FGS 2941 (High Speed Astrometry - Search for Planetary
Companions to Low Mass)

Astrometric observations were made on the position of Barnard's star
using the Fine Guidance Sensors to look for the presence of a Jupiter
sized planet in orbit around the target star. The observations were
monitored in the OSS,and no problems were seen.

1.2 Completed FGS 4775 (Exposure Time Calibration in High Background
Fields)

The Fine Guidance Sensors were used to make observations of planetary
nebula MZ3 (aka, Menzel 3) to determine the minimum observing time needed
for doing transfer mode astrometry of stars which are superposed against
a bright background. The astrometric observations were made during LOS.
The OSS monitored the observations, and no problems were reported.

1.3 Uplinked Updated Ephemeris Tables, Per MOSES 2871

1.4 Completed GHRS/2 3965 (Spectroscopy of BL Lac Objects, Cycle 2)

The High Resolution Spectrograph was used to make six spectral
observations of BL Lac object PKS2155-304 to look for broad blue-shifted
absorption lines. All six spectral observations were reported to be okay.

1.5 Completed FOS/BL 4054 (Probing the Nuclear Regions of Seyfert Galaxy
NGC-5548)

The Faint Object Spectrograph was used to make observations of the
Seyfert galaxy NGC-5548 to look for time variations in its continuum, and
emission lines in Carbon IV and Helium II. The observations were executed
as scheduled, and no problems were reported.

1.6 Completed WFC 4381 (HST Medium-Deep Survey - Cycle 3)

The Wide Field Camera was used to make high latitude medium-deep sky
survey observations taken in parallel with the prime science
observations. The OSS monitored the observations and assessed the data
quality. No problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 4
Successful : 4

Scheduled Reacquisitions : 9
Successful : 9
Losses of Lock : 0

2.2 FHST Updates:

Scheduled : 9
Successful : 9

2.3 Significant HSTARs: None

2.4 Operations Note:

Bus C Gyro 1 Turn-on Test

The Bus C activation and Gyro 1 turn-on test was executed on the
spacecraft on Tuesday, May 11. Commands to close Bus C were executed
about 2:57 PM local time. Analysis of the R format data showed a
raise in current of about 11 amps for about 300 milliseconds. This
appears to have been the transfer switch closing.

Commands to turn-on Gyro 1 were sent about 5:07 PM local time. The gyro
did not come on. A second try to command the gyro on was made and this
was also unsuccessful.

A second Bus C activation was done about 8:13 PM Tuesday night. Bus C was
commanded open and then commanded closed again. This second activation
was done to further characterize the current profile of the transfer
switch closing. A similar, but not identical, signature was observed
during the second Bus C activation. Bus C was commanded open and the
spacecraft was restored to normal operational configuration.

Analysis of the Bus C Gyro 1 test data is continuing.

The GSFC Internal Simulation (Type 1 + Replan) has been initiated
(Wednesday, May 12), and is currently under way.


3.0 ACTIVITIES SCHEDULED FOR NEXT REPORTING PERIOD:

3.1 Complete Two Sets of FOS/BL 4697 (FOS Polarimetric Calibration)

3.2 Complete GHRS/2 3945 (G168M Spectra of Eta Car S Condensation - Cycle
2)

3.3 Complete Two Sets of FOC/96 3801 (Search for QSOs Suitable for
Subsequent Observation of He II)

3.4 Complete WFC 4929 (WF/PC Cycle 2 : Improved Dark Calibration)

3.5 Complete FOS/BL 4054 (Probing the Nuclear Regions of Seyfert Galaxy
NGC-5548)

3.6 Complete WFC 4381 (HST Medium-Deep Survey - Cycle 3)

4.0 ANOMALY STATUS:

4.1 Significant New Anomalies: None

4.2 Significant Unresolved Anomalies: None

5.0 SIGNIFICANT FORTHCOMING EVENTS: Nothing at this time.

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