To:sot_shift
from: Dan Schwartz
date: 4 Aug 99, 0600 EDT
Subject: SOT shift report, Shift A13
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_04_1999_A.txt.

Shift A13. 
	Start at 216:01:00  GMT
		 = 09:00pm 3 Aug EDT
	End	   06:00am 4 Aug
   
SOT Lead	DAS
Spac/Aspect	WAP
FOT/Sci liason	EM
HRC		AR 
ACIS 		PPP,RB

(Times will be given in GMT on day 216. In general
times are rough, not precise.)

PLAN
Perform IPS BURN 4 dry run.
Perform SSR recorder playback
Perform CAP 37B for MUPS unload
Send up the loads for IPS Burn 4.
Remain in Format 4, OBSID 62480, throughout shift. No SI activities.


EVENTS
01:40 Uplink the loads for IPS 4 dry run.
02:20 CAP 43, RCS catbed heaters.
03:12, heaters reach minimum temperature which would allow a burn.
Earth scan shows yaw good to 1/2 deg, Roll and pitch good to ~.3
deg. Is good enough for burn. (Will probably update later in the
day.)
03:47, Pitch to burn attitude.
04:30, Back to NSM.

04:47, run CAP 129 to command fid light tracking. 

Vacuum monitor on throughout shift. Reading 8.8 x 10^-6 torr.

Set up to run ACIS internal cal measurements, 06:00.
Change to FOrmat 2, 06:38.
Uplink OBSID 62731 at 06:39.
   Stop science at 09:30
Uplink OBSID 62730 at 09:32
   plan to continue to ~12:00

SSR playback at 06:55.

MUPS unload at 07:45.


NOTES/ISSUES/PROBLEMS
Next shift, Wed Aug 4, 6am EDT, the SOT will start three shift
operation. Our shift reports will be designated L (6am to 2pm),
M (2pm to 10pm), and H (10pm to 6am). I suggest appending numerical
values to these letters which correspond to the concurrent A/B
shift number which the TST will keep: i.e., the sequence will 
be A13 (this report), L13, M14, H14, L14, etc.  COMMENTS?

At the burn attitude, pitch 62 deg., we lose 3 of the 4 fid lights due to
  light leak, as expected. Keep slot 7 in track. The camera also
  reports that slot 5 is also tracking, but this is clearly just
  chasing stray light or a bright pixel. This is finally lost after 
  5 or 10 minutes. The magnitudes reported to the OBC seemed to 
  "freeze" (not get updated) during this time. 

We need to determine what the camera is reporting to the OBC in terms
of magnitude.  If it really does not subtract background, we need
to prepare a contingency response as follows: if there is a light
leak or other background enhancement, the magnitude window set
by the OFLS, of about +/- 1.5 mag, may cause us to fail to lock
on any stars.   
-------------------------------------------------------
Dan Schwartz,	MS #3
das@head-cfa.harvard.edu  
phone: (617)495-7232    FAX:   (617)495-7356
cell phone: (617)512-5627   RB,FB,MB
pager: 800-759-8352 PIN 1636502
       or e-mail 1636502@skytel.com 
-------------------------------------------------------