SOT Shift Report

Shift M29
Duration:	19 Aug 1999 14:00 EDT - 19 Aug 1999 22:00 EDT
		19 Aug 1999 18:00 GMT - 20 Aug 1999 02:00 GMT

SOT Lead:           Tom Aldcroft
Spacecraft/Aspect:  Mark Freeman
FOT/Science Liason: 
HRC:                Gary Meehan
ACIS:               Paul Plucinsky

========================================

Plan
----
Dwell at RA=12.5 Dec=73.0 until ~22:30 collecting HRC internal calibration
Re-start ACIS science run with CAP 318 to clock out CCDs
Review load package, rebuild, approve, and uplink load.
Maneuver to Cas-A and observe with ACIS-S

Events
------
18:30 Maneuver to RA=12.5 Dec=73.0
21:48 Lost fid light in slot 5 (VCDU 303477) due to cosmic ray
22:00 Use CAP 316 to activate SCS 85 to turn down HRC HV
22:30 Start CAP 318 to restart ACIS science run
22:39 Unplanned LOS, station 61 reporting sudden loss of telemetry
22:49 Regained telemetry, after switching to channel 1
22:58 Update OBSID to 62447
23:00 ACIS start science
23:30 Daily load uplinked
23:45 ACIS stop science issued
00:00 Daily load started
00:12 Maneuver to Cas-A finished: 4 stars and 3 fids acquired
00:20 ACIS bias being acquired
00:40 OBSID 472 started

Notes/Issues/Problems
---------------------
OFLS release 7 has a problem producing dither commands.  It sets 
dither_mode='steady', requiring a hand-edit.  This has been fixed
already at the HOSC.