HUBBLE SPACE TELESCOPE

       DAILY REPORT #2522

PERIOD COVERED:  0000Z (UTC) 12/16/99 - 0000Z (UTC) 12/17/99

Daily Status Report as of 351/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

Since HST remains in Zero Gyro Sun Point (ZGSP), no science observations 
were performed.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:

                                         No activity

    2.2 FHST Updates:

                                         No activity

    2.3 Operations Notes:

        The HST is in ZGSP.  Yesterday's scheduled shuttle launch was 
delayed for one day.

        Using ROP DF-1, a full DF-224 dump was performed at 350/0809Z.

        Per Operations Note #661, the time-based recharge ratio 
charge/discharge buffer was reset at 350/1520Z.

        While in ZGSP, the HST failed to capture the sun during a day pass 
that began at 350/1758Z.  The RWA wheels speeds exceeded 3000 rpms with no 
momentum management (by design) in night.  The HST failed to reach trickle 
charge in that day pass and the subsequent day pass.  Accordingly, the rate 
of charge test failed at 350/2039Z.  The NSSC-1 was powered off, as were 
the WF/PC-2 heat pipe heaters.  HSTAR 7410 was written.

        During the above event, at 350/1925Z, the FGEs were turned off for 
load shedding.  Later, the FGEs were turned back on at 250/2337Z.  The SI 
C&DH error flags were reset at 350/2337Z.  The rate of charge test was 
re-enabled at 350/2345Z.

        The telemetered WF/PC-2 temperatures were changed and additional 
monitoring was initiated at 350/2350Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Servicing Mission 3A is now scheduled for a launch on December 
17.  The launch window opens at 352/0147Z

/CAW