To:sot_shift
from: Dan Schwartz
date: 1 Sep 99, 06:00am EDT
Subject: SOT shift report, Shift H41
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_31_1999_H41.txt.

Shift H41.
	Start at 244:02:00  GMT
		 = 10:00pm 31 Aug EDT
	End	   06:00am 01 Sep
   
SOT Lead	DAS
Spac/Aspect	
FOT/Sci liason	
HRC		MVZ
ACIS 		

(Times will be given in GMT on day 244. In general
times are rough, not precise.)

PLAN
Continue running under load P9
Enter radiation belts
Perform CAPs 364, 365, and 367 to test software insertion and retraction
	of gratings.
Perform CAP 352 to adjust HRC-I focus position to -900 motor steps.

EVENTS
start at LOS, OBSID 01290, MOSAIC BKGD 1, is running, with HRC-I
	at focus position -505 (NOT best HRC-I focus!).

04:02 AOS. OBSID is 62396. Maneuver in progress. Locked on 3 fid lights.
	At conclusion of maneuver we acquire 4 stars, fail on one star.
	No fid lights were attempted to be found.
HRC verifies detector HV is half, Antico HV is off.

04:08 Switch to format 2 to verify ACIS shutdown.  
04:09	ACIS confirms stop science. Video boards off.
~04:10
04:14	Return to format 1.
04:19	SIM focus is reset to -899.

04:24	Start CAP 365, HETG insertion via software command.
	Software commands do not work!
04:28	switch to FORMAT 4. 
~06:05	Return to Format 1.
07:20   LOS

	
NOTES/ISSUES/PROBLEMS
The software insertion of the HETG did not work.  The OBC software patch
  to address the telescope RCTU WAS successful.  However, the OBC
  software contained nominal calibration conversion constants for
  the grating motor voltage -- these were inaccurate and caused the
  OBC to think that the motor was not at proper voltage, and thus
  would not send the commands to power the motor to move the gratings.    

HEADS-UP:  Eclipses are coming.  Wallace Jackson reminded me that the 
	season starts Sept 17 with a penumbral eclipse, and lasts
	about a month, with a peak eclipse duration of ~100 minutes.
	We need to be find out the actual power usage and capability
	on-orbit, and be involved in the planning for eclipses.

Rino Giordano showed me the OBA thermal plots for the last two 
	days.  On day 242 from ~06:00 to 1400 GMT the diametral 
	gradient went up to 2deg F from its usual 0.5 deg F. Do
	we see any effects in the fid lights or X-ray images in
	this time?
-------------------------------------------------------
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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