[Isocops] .STF file

Mark Tapley mtapley at swri.edu
Mon Jun 21 12:26:09 EDT 2010


All,
	looked over the .STF file produced this morning. If the 
repointing maneuver is done according to the predictive .oef file:

IBEX_2010_Forecast_18June10-30Sept10_v001.oef

it'll look about like:

2010-07-05T06:26:28.067Z,RepointingTargetVector,vtsX:-0.2251425321231968,orbit:84,vtsZ:0.387883331407774,vtsY:0.8937882083833745


So off I go to ibex_rotate


[tapley at ena ~]$ ibex_rotate -o -u 
-0.22514253212319688,0.8937882083833745,0.387883331407774 ibex-sun -t 
2010-07-05T06:26:28.067Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.225143,+0.893788,+0.387883
  which is     R.A. +104.138 Decl. +22.823
  missing      R.A. +104.145 Decl. +22.822 
(-0.22514253212319688,0.8937882083833745,0.387883331407774)
  error is     R.A.   +0.006 Decl.  +0.001
  for a total  0.006 deg
[tapley at ena ~]$ ibex_rotate -o -u 
-0.22514253212319688,0.8937882083833745,0.387883331407774 ibex-sun -t 
2010-07-11T15:36:30.000Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.225143,+0.893788,+0.387883
  which is     R.A. +104.138 Decl. +22.823
  missing      R.A. +110.700 Decl. +22.060 
(-0.22514253212319688,0.8937882083833745,0.387883331407774)
  error is     R.A.   +6.561 Decl.  +0.763
  for a total  6.112 deg


Looks like the PL will be safe from the time of the maneuver until 
the descending time (good), if the actual repointing is done before 
the ASC macros run during the preceding perigee pass.

There's no star tracker outage during science operations.

It looks good to me.
-- 
						- Mark     210-379-4635
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Large Asteroids headed toward planets
inhabited by beings that don't have
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