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.

/CAW