To:sot_shift
from: Dan Schwartz
date: 15 Aug 99, 02:00pm EDT
Subject: SOT shift report, Shift L24
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_15_1999_L24.txt.

Shift L24.
	Start at 227:10:00  GMT
		 = 06:00am 15 Aug EDT
	End	   02:00pm 15 Aug
   
SOT Lead	DAS
Spac/Aspect	
FOT/Sci liason	
HRC		JR
ACIS 		RB,SK

(Times will be given in GMT on day 227. In general
times are rough, not precise.)

PLAN
finish ACIS plate focus measurement.
Start running on stored command loads
Start ACIS S off-axis effective area measurement

EVENTS
Running OBSID 62549 for last focus step

11:07  Start manuever under SCS control
11:10  ACIS stop science run
OBSID is set to 163
11:40  End of maneuver. ACA locks on 4 stars (as commanded) and 3 
	fid lights. SUCCESS! RA=  278.4575, -10.1807  roll= -99.7784
	is the on-board attitude estimate. At G21.5-0.9.
11:46  ACIS sends start science. 10Ksec observation. 
14:55  Start maneuver, 9 arcmin. 
14:57  ACIS stop science. 
15:00  new target, acquire 5 stars, 3 fids. 
	RA=  278.434086  dec = -10.3211, roll= -99.577
	New OBSID is 164
15:30   lose comm
17:30   AOS
17:55   Maneuver to next position.
	ACIS stop science
17:57   Change to OBSID 166
17:59   At new position, get 5 stars, 3 fids.


NOTES/ISSUES/PROBLEMS
Discussion of SIM focus reference. Analysis was referenced from
  the prelaunch nominal position of 172 motor steps. This is at
  +0.256mm from a nominal zero. The plate focus analysis shows 
  ~-1 mm offset, or motor step -504.  A fit to the ACF gave an
  offset of -1.13mm, motor step -595, and this is what the
  characteristics file in the odb has been set to. However, this
  may have been premature in that the ACF fit included some off
  axis points.  

Times of ACIS start and stop science are taken from their 
  EGSE, and seem several minutes fast.

A CAP enters new fid light positions, the -595 focus position, 
  and an SI/alignment matrix into the data base for the next
  SCS generation.
-------------------------------------------------------
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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