Sep_20_1999_M60.txt Shift M60
        Start at 1999:263:12:45 GMT = 1999 Sep 20 8:45am EDT
        End                           1999 Sep 20 5:00pm EDT

   
SOT Lead	Ed Kellogg
FOT-SI		
ACIS		Yousaf Butt
HRC-SI		

(Times: hhmm or ddd:hhmm, not precise.)

Plan: Continue with p16 load - M82 observation, ACIS diagnostics.

EVENTS	day 263						DONE	OBSID
--------------						----	-----
ACA shows 2 fids, 5 stars				1620	361
SIM position 92903, ACIS-I, both gratings retracted	1620	361
AOS, ACA shows 3 fids, 5 stars				1800	1302

NOTES/ISSUES/PROBLEMS 
--------------------- 
S/C state at 1624:

       PCAD MODE= NPNT
       Stars:	= 5
       FIDS	= 2
       RA	= 148.944 est.
       DEC	= 69.6565 est.
       ROLL	= 30.106 est.
       Format	= 2
       OBSID	= 361
       SIM FA	= -535
       SIM TSC	= 92903
       HETG	= 81.3, 81.7 (out)
       LETG	= 81.7, 79.8 (out)


We are executing the p16 load, doing an observation of M82 with
ACIS-I, no grating. We have only two fidlites, apparently having lost
one. Tony LaVoie will look into getting the patch to re-acquire the
fid implemented. Linda looked into it and has now transferred the
relevant patch (problem report 39) to the ODE. Do we want to use it
the next time this happens? As of 2215 we have 3 fids, 5 stars. 

Summary from 9 am meeting
-------------------------

Wallace Jackson reported that the eclipse on Sept. 19 went well. It
lasted 51 min., the voltage went up to 33.5 max, 1/2 V from the
prediction. There was some discussion about revising the
prediction. The array pumped out 110-112 A at eclipse exit, a good
number. Next eclipse is Wednesday at 5:28 am EDT and lasts 50-60 min.

Ken Gage is working on the next load, to go up 8 am EDT Tues, will
last to Friday. It must be reviewed this evening.

Chris reported that we can't use 26 m antennae for SRR dumps at
altitudes above ~128,000 km. He recommended that we no longer schedule
these passes. Ron will review and get recommendations.

Rino reports that at + pitch angles there's lots of heating (100-150W)
in aft end bulkhead, flexures, and even the S/C front area. We need a
requirement to point at negqative  pitch for at least 1 hr prior to
eclipses to get the heaters running.

Tony requested a report from Science on ACA performance, especially
the magnitude discrepancy - is it stable? Ed K asked Tom Aldcroft for
one by email to Tony.