Sep_27_1999_M66.txt Shift M66
        Start at 1999:270:16:00 GMT = 1999 Sep 27 12:00pm EDT
        End                           1999 Sep 27 5:00pm EDT

SOT Lead	Ed Kellogg
ACA/SC		
FOT-SI		
ACIS		Yousaf Butt	
HRC-SI		

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

Plan: stay on Normal Sun Mode, ACA has 6 stars, do eclipse, send up
ATS for ACIS CTI measurement.

We started the shift AOS. S/C state:

		  1911 GMT	
		 ---------	
       PCAD MODE= NSUN,AQXN	
       Stars:	= 6		
       FIDS	= 0		
       RA	= 
       DEC	= 
       ROLL	= 
       Format	= 4
       OBSID	= 0
       SIM FA	= -535	
       SIM TSC	= -99608
       HETG	= out
       LETG	= out

EVENTS	day 267				DONE	OBSID
--------------				----	-----
Start eclipse				1627	0
End eclipse				1737
ACA now has 5 stars			1915


NOTES/ISSUES/PROBLEMS 
--------------------- 
We prepared an ATS to do the ACIS CIT measurements, since the load is
not running.

One of the six stars was gradually getting out of the field of view,
since we are in Normal Sun Mode, and not using stars to stabilize our
pointing. This star finally was lost.

Quote from Bruce Twambly: "The aforementioned operator error initiated
a transition to Normal Sun mode (as opposed to Safemode on the
B-side.)  Safemode was actually triggered by latent design flaw in the
safing actions that allowed the sim table to translate with the
momentum monitor enabled.  Until SCS81 is patched, a transition to NSM
is most likely synonymous with a transition to Safemode."

from Paul Green at 4:20 pm:
"Current attitude in normal Sun mode:
RA,Dec J2000.0                292.500000   -85.200000	roll 288.7 deg
Galactic l,b                  308.284609   -27.830417"

Notes from 4 pm ACIS meeting
-----------------------------

Roger Brissenden: ACIS is in next-in-line position, planning cti measurement around 8pm
EDT. Pick up load just prior to next rad entry.

Yousaf Butt: we have ~10e4 more low energy (0.1-1.0 MeV) protons than ASCA in our orbit.

Allyn Tennant: consider rutherford scattering.

Mark Bautz: the damage appears to get worse for chips closer to the
aim point.