[Isocops] Fwd: High resolution (oxygen mode) test during lunar viewing

Mark Tapley mtapley at swri.edu
Wed Jun 9 15:34:14 EDT 2010


Nathan,
	Sorry, just dug back to this message now. Looks like Greg 
responded with syntax, timing, etc.

	The sun-pointing maneuver is between 10 and 15 Re, not 3 Re.

	If the sun-pointing maneuver puts us directly on the pointing 
vector given in the .oef,

2010-06-27T10:53:04.828Z,RepointingTargetVector,vtsX:-0.09713517962079862,orbit:83,vtsZ:0.3961860371665777,vtsY:0.9130177330338543


	then ibex_rotate shows sun angles as follows:

2010-07-01T14:00:00.000Z	+4.000
2010-07-01T24:00:00.000Z	+4.395
2010-07-03T15:00:00.000Z	+5.916

	No problem, even if we add in a 1 degree deadband error.
	If the sun-pointing maneuver points us directly at the sun, 
then ibex_rotate shows:

2010-07-01T14:00:00.000Z	4.575 deg
2010-07-01T24:00:00.000Z	4.970 deg
2010-07-03T15:00:00.000Z	6.491 deg

	Still OK, but worst-case 1 degree deadband is now dicey 
(total 7.491 degrees from sun). But considering this is worst-case, I 
think we are OK.



>Hey Mark
>
>It looks like you are digging into the IBEX ops and starting to 
>understand our chaos. Well done!
>
>Could you please verify the stuff below (Manuever times and sun 
>pointing at the end of the message).
>
>Also, I need to find out if the syntax is correct for the message I 
>sent to Greg ..
>

-- 
						- Mark     210-379-4635
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Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:

				Think of it as Evolution in Fast-Forward.


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