To:sot_shift
from: Dan Schwartz
date: 08 Oct 99 , 11:00am EDT
Subject: SOT shift report, Shift L77
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Oct_08_1999_L77.txt.

Shift L77. 
	Start at 281:11:00  GMT
		 = 07:00am 08 Oct EDT
	End	   11:00am 08 Oct
   
SOT Lead	DAS
Spac/Aspect	
FOT/Sci liason	
HRC		
ACIS 		

(Times will be given in GMT on day 281. In general
times are rough, not precise.)

PLAN
Running Load P20. Out of comm until 16:30.
  Will perform ACIS post belt CTI measurements starting ~ 14:00.

EVENTS

NOTES/ISSUES/PROBLEMS
At start of shift, Chandra's state from the last LOS, 
281:08:28, was as follows:

       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5  
       FIDS                   =          0 
       RA                     =  131.895 deg
       DEC                    =   78.099 deg
       ROLL                   =   60.944 deg
       Format                 =          2
       OBSID                  =      62359
       SIM FA                 =       -467
       SIM TSC                =     -99615 (HRC-S)
       HETG                  =     OUT
       LETG                  =     OUT
        HRC HV is OFF

Chandra sailed through the last eclipse, 49 minutes long
starting at 06:53 GMT. All went as planned. 
The next eclipse, 283:22:30 on Sunday, will be so short that
the OBA heaters and LAE heaters will be forced on to drive
the battery depth of discharge such that the batteries can
load the increased power coming from the cooled solar arrays 
when they are brought back on-line.

Prior to radiation belt entry yesterday, we measured ACIS CTI
at -120 degC on the ACIS-I array.  However, because the cool-down
process took more than 3 hours (~2 was expected) we did not
have time to do the ACIS-S CTI measurement. So use of OBSID 62503
was aborted, and some extra time was spent on the ACIS-I CTI
measurement.  SHOULD OBSID 62503 be recycled for future use?
-------------------------------------------------------
Dan Schwartz,	MS #3
das@head-cfa.harvard.edu  
phone: (617)495-7232    FAX:   (617)495-7356
cell phone: (617)512-5627   
pager: 800-759-8352 PIN 1636502
       or e-mail 1636502@skytel.com 
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