Hubble Space Telescope Daily Report #2862 – 1 May 2001

HUBBLE SPACE TELESCOPE

DAILY REPORT #2862

PERIOD COVERED: 0000Z (UTC) 04/30/01 – 0000Z (UTC) 05/01/01

Daily Status Report as of 121/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

The following scheduled proposals did not execute due to the acquisition
problems detailed in 2.1 and HSTAR 8196:

Three Sets of FGS/1 8731 (A High Angular Resolution Survey of the
Most Massive Stars in the SMC)

Three Sets of WF/PC-2 9244 (POMS Test Proposal: WFII Parallel
Archive Proposal Continuation)

Four Sets of STIS/CCD 9248 (Probing the Large Scale Structure:
Cosmic Shear Observations)

Three Sets of WF/PC-2 8827 (Cycle 9 Supplemental Darks pt2/3)

Two Sets of STIS/CCD 8864 (CCD Dark Monitor-Part 2)
WF/PC-2 8604 (Stellar Populations Across the Small Magellanic Cloud
( SMC) : History and Structure)

STIS/CCD 8865 (Bias Monitor-Part 2)

Three Sets of STIS/CCD 8836 (Performance Monitor {Cycle 9})

Six Sets of WF/PC-2 8811 (Cycle 9 Standard Darks)

WF/PC-2 8583 (Imaging Snapshots of Asteroids)

WF/PC-2 8829 (Observatory Focus Monitor)

STIS/CCD 8841 (Hot Pixel Annealing C9)

Five Sets of WF/PC-2 8585 (Cosmological Parameters from Type
Ia Supernovae at High Redshift)

WF/PC-2 8821 (Cycle 9 CTE Monitor)

WF/PC-2 8585 (Cosmological Parameters from Type Ia Supernovae at
High Redshift)

WF/PC-2 8602 (A Snapshot Survey of the Sites of Recent,
Nearby Supernovae)

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions: 16

Successful: 8

HSTAR 8196 documents acquisition failures at 120/0208Z, 120/0352Z,
120/0624Z (these three were mentioned in yesterday’s report), 120/0907Z,
120/1109Z, 120/1245Z, 120/1421Z, 120/2046Z, 121/0032Z, 121/0215Z, 121/0254Z.

Scheduled Re-acquisitions: 1

Successful: 1

2.2 FHST Updates:

Scheduled: 22

Successful: 18

HSTAR 8196 mentions update failures at 120/0534Z (covered in
yesterday’s report), 120/0843Z, 120/1048Z, 120/1228Z, 120/1404Z.

2.3 Operations Notes:

Note: Yesterday’s report contained an incorrect statement. Part
of this section should have read :”Gyro #2 was powered on and gyro #5 was
powered OFF at 118/2309Z.”

Due to the gyro bias update reflecting the new gyro complement that
was uplinked at 120/0000Z (HSTAR 8192), there were a series of FGS
acquisition and FHST update failures (HSTAR 8196). A series of attitude
reference updates (ARUs) were performed but were unsuccessful in regaining
FGS control until a new RGA table load was uplinked at 121/0016Z. Another
ARU was executed at 121/0343Z and the subsequent FGS acquisitions were
successful.

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

The CCS engineering status buffer was dumped and cleared at
120/1723Z per ROP DF-18A.

A 486 table dump was performed at 120/1454Z as directed by ROP DF-01A.

A TTR was written when an unexpected TDE support at 120/2247Z
became available. Another TTR detailed the TDE support at 120/2315Z for
which 171 support could not be scheduled. As a result there was a
25-minute loss of engineering data.

Using ROP DF-07A, the ephemeris load was uplinked at 121/0350Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.