[Isocops] Orbit 086 ATS

[Mark Tapley]

All,
	Orbit 86 ATS looks good.

If the maneuver works, pointing stays within 6.2 degrees for the entire orbit.

[tapley at ena o0084]$ ibex_rotate -o -u 
-0.5706100893417371,0.753317002625593,0.32698259815563147 -w ibex-sun 
-t 2010-07-27T10:38:22.000Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.570610,+0.753317,+0.326983
  which is     R.A. +127.143 Decl. +19.086
  missing      R.A. +126.480 Decl. +19.230 (ibex-sun)
  error is     R.A.   +0.663 Decl.  +0.144
  for a total  0.642 deg
[tapley at ena o0084]$ ibex_rotate -o -u 
-0.5706100893417371,0.753317002625593,0.32698259815563147 -w ibex-sun 
-t 2010-07-27T16:51:17.712Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.570610,+0.753317,+0.326983
  which is     R.A. +127.143 Decl. +19.086
  missing      R.A. +126.737 Decl. +19.177 (ibex-sun)
  error is     R.A.   +0.405 Decl.  +0.091
  for a total  0.394 deg
[tapley at ena o0084]$ ibex_rotate -o -u 
-0.5706100893417371,0.753317002625593,0.32698259815563147 -w ibex-sun 
-t 2010-08-03T12:46:48.210Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.570610,+0.753317,+0.326983
  which is     R.A. +127.143 Decl. +19.086
  missing      R.A. +133.416 Decl. +17.463 (ibex-sun)
  error is     R.A.   +6.274 Decl.  +1.622
  for a total  6.174 deg


All of the ground contact times match the SC transmitter on times.

A separate email describes a check into star tracker outages near the 
maneuver, and a backup plan for those maneuvers. In case the maneuver 
fails, looking back from the previous inertial maneuver,

[tapley at ena o0084]$ ibex_rotate -o -u 
-0.4625010671959609,0.8133201951554043,0.35299153388568977 -w 
ibex-sun -t 2010/07:19:12:12:41
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.462501,+0.813320,+0.352992
  which is     R.A. +119.625 Decl. +20.670
  missing      R.A. +118.631 Decl. +20.820 (ibex-sun)
  error is     R.A.   +0.994 Decl.  +0.149
  for a total  0.941 deg
[tapley at ena o0084]$ ibex_rotate -o -u 
-0.4625010671959609,0.8133201951554043,0.35299153388568977 -w 
ibex-sun -t 2010-07-27T16:51:17.712Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.462501,+0.813320,+0.352992
  which is     R.A. +119.625 Decl. +20.670
  missing      R.A. +126.737 Decl. +19.177 (ibex-sun)
  error is     R.A.   +7.112 Decl.  +1.493
  for a total  6.851 deg
[tapley at ena o0084]$ ibex_rotate -o -u 
-0.4625010671959609,0.8133201951554043,0.35299153388568977 -w 
ibex-sun -t 2010-07-28T08:51:17.712Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.462501,+0.813320,+0.352992
  which is     R.A. +119.625 Decl. +20.670
  missing      R.A. +127.403 Decl. +19.025 (ibex-sun)
  error is     R.A.   +7.778 Decl.  +1.645
  for a total  7.498 deg

We will still be within the 7.5 degree limit until ~ 
2010-07-28T08:51:17.712Z. So even if the pass  at

IBEX,AUWA01,ADD,07/27/10,208,11:35:00,07/27/10,208,12:10:00,,LAHO 
320K IBEX Orbit#86 SSR_Dump/Tracking Contact

fails, we can recover anytime in the next 20 hours to either cancel 
the ASCENDING macros or manually send DESCENDING macros to safe the 
payload.


I approve the ATS.
-- 
						- Mark     210-379-4635
-----------------------------------------------------------------------
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