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HUBBLE SPACE TELESCOPE

DAILY REPORT #1811

PERIOD COVERED: 0000Z (UTC) 02/06/97 - 0000Z (UTC) 02/07/97

Daily Status Report as of 038/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed GHRS/2 6520 (The Origins of Boron)

The High Resolution Spectrograph (Side One) was used to make =
observations of BD-06D1250 (a star located in the Orion class OB1 =
association) in order to study the origins of the element boron. This =
star is the youngest of these stars and its shows higher oxygen =
abundances than the other older stars. Approximately four-and-a-half =
hours into this ten-and-a-half hour proposal, the GHRS safed while =
operating with high voltage on Side 2. HSTAR 5889 was written to =
describe this and the resulting status buffer messages. See Section 2.3 =
for further details.

1.2 Completed Two Sets of WF/PC-2 6909 (WF/PC-2 Cycle 6 Calibration: =
Earth Flats

The WF/PC-2 was used to make observations of the bright Earth to =
obtain streak flats which are used to construct high quality flat fields =
for the WF/PC-2 filter set. The observations were executed as scheduled, =
and no anomalies were noted.

1.3 Completed WF/PC-2 6906 (WF/PC-2 Cycle 6 Calibration: Internal =
Monitor-Visual Flats)

The WF/PC-2 was used to make internal calibration visual flat =
images as part of the Cycle 6 internal monitoring of the instrument's =
operations. This proposal defines the standard series of internal flat =
fields, which will be executed twice per month. The observations were =
completed as planned, and no anomalies were reported.

1.4 Completed FOS/BL 6584 (Interaction of Supernovae With =
Curcumstellar Material)

The Fine Object Spectrograph (Blue Side) was used to make =
observations of Supernova SN1995N. The objective is to study the =
interaction between the supernova and the remnant circumstellar material =
from the progenitor star, and how that interaction can sustain supernovae =
luminosity for long periods. Two hours before the end of this ten-and-a-h=
alf hour proposal, the failed re-acquisition mentioned in 2.1 occurred. =
One observation was taken with the take data flag down. Otherwise, the =
remaining observations executed as scheduled, and no further anomalies =
were noted.

1.5 Completed Two Sets of WF/PC-2 7203 (Cosmology with the Medium Deep =
Survey - Short Orbit Cases)

The WF/PC-2 was used to take short (about 20-minute) exposures, to =
be taken in parallel with the prime science observations, using the I =
filter. These exposures are part of the medium-deep survey, which =
emphasizes exposures that will be useful in obtaining cosmological =
parameters. The observations were completed as planned, and no problems =
were reported.

1.6 Completed WF/PC-2 6802 (Cosmology with The Medium Deep Survey)

The WF/PC-2 was used to make observations in parallel with the =
prime science observations as part of the medium deep survey (MDS). =
These parallel MDS exposures have provided unique high resolution images =
which clearly supplement the primary HST surveys. During this proposal, =
the failed re-acquisition mentioned in 2.1 occurred. One observation was =
taken with the take data flag down. Otherwise, the remaining =
observations executed as scheduled, and no further anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 5
Successful : 5

Scheduled Reacquisitions : 11
Successful : 10

Per HSTAR 5890 and at 037/203801Z, a guide star re-acquisition =
failed.

2.2 FHST Updates:

Scheduled : 10
Successful : 10

2.3 Operations Notes:

At 037/045901, GHRS safed due to limit violations on Z28AIN2, the =
input current to Side 2. The PDU current showed a jump of 7 amps at the =
same time. GHRS was in the middle of a series of observations, with the =
HV on, but was not observing at the time. Numerous other GHRS voltage =
monitors show step changes at the same time. No other unusual spacecraft =
events were noted. At 037/2231Z, after a series of meetings, the LVPS =
for Side 1 was turned on.

The GHRS COSTAR arm is scheduled to be retracted on 040/0905Z in =
preparation for the GHRS change-out for SM2. Other meetings today will =
decide whether the COSTAR observations will occur as planned or whether a =
workaround will be utilized.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

SM2 is scheduled to begin next Tuesday, with the launch of the =
Shuttle at approximately 042/0856Z.

/DMH