[Isocops] Fwd: STF for Orbit 0118 - v002 done.

[Mark Tapley]

All,
	the v001.stf for orbit 118 has been 
modified to include -Lo O-mode commands and to 
scoot the descending time back by 12 hours, 
producing:

IBEX_2011_079_19_43_v002.stf

	which is attached, and has been copied 
from my directory on ena.unh.edu to:

/usr/local/IBEX/ops/SFTP/ibex/moc/Soc-Moc/stf/IBEX_2011_079_19_43_v002.stf
/usr/local/IBEX/raw/o0116/IBEX_2011_079_19_43_v002.stf
/usr/local/IBEX/work/ops/hvscistf/IBEX_2011_079_19_43_v002.stf

	it has also been placed on the SFTP server at:

/ibex/moc/Soc-Moc/stf/IBEX_2011_079_19_43_v002.stf


	Changes include:

1) scooted back descending commands to occur 
before 2011-03-27T02:32:51.089Z, to prevent 
sun-angle > 7.25° even with a 1° deadband on the 
sun-pointing maneuver at the end of O117/begin 
0118.

	Notes:

	Since the ATS has not been produced, I 
don't know when the sun-pointing maneuver will 
take place. I assumed it would be close to the 10 
Re ascending time, which is: 
2011-03-20T19:43:32.131Z per 
IBEX_2011_Orbit117_v001.oef.

	**** ATTENTION **** If the sun-pointing 
maneuver is not very close to or after this time, 
this STF will need to be modified!!

	At this time, the sun vector will be R.A. 
+359.737 Decl.  -0.103 (ibex-sun):

[tapley at ena ~]$ ibex_rotate -o -w ibex-sun -t 2011-03-20T19:43:32.131Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +1.000000,+0.000000,+0.000000
  which is     R.A.   +0.000 Decl.  +0.000
  missing      R.A. +359.737 Decl.  -0.103 (ibex-sun)
  error is     R.A. +359.737 Decl.  +0.103
  for a total  0.283 deg

	If the maneuver points us perfectly at 
the sun, the sun angle at the maneuver (should be 
zero), ascending time (should be small) and 
descending time will then be:

[tapley at ena ~]$ ibex_rotate -o -r +359.737 -d 
-0.103 -w ibex-sun -t 2011-03-20T19:43:32.131Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.999988,-0.004590,-0.001798
  which is     R.A. +359.737 Decl.  -0.103
  missing      R.A. +359.737 Decl.  -0.103 (ibex-sun)
  error is     R.A.   +0.000 Decl.  +0.000
  for a total  0.000 deg
[tapley at ena ~]$ ibex_rotate -o -r +359.737 -d 
-0.103 -w ibex-sun -t 2011-03-20T23:39:51.926Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.999988,-0.004590,-0.001798
  which is     R.A. +359.737 Decl.  -0.103
  missing      R.A. +359.895 Decl.  -0.034 (ibex-sun)
  error is     R.A.   +0.158 Decl.  +0.069
  for a total  0.172 deg
[tapley at ena ~]$ ibex_rotate -o -r +359.737 -d 
-0.103 -w ibex-sun -t 2011-03-27T14:32:51.089Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.999988,-0.004590,-0.001798
  which is     R.A. +359.737 Decl.  -0.103
  missing      R.A.   +5.903 Decl.  +2.530 (ibex-sun)
  error is     R.A. +353.834 Decl.  +2.633
  for a total  6.703 deg

	maneuver sun angle is zero as expected 
and ascend sun angle is very small, but descend 
puts the angle including a 1-degree deadband 
outside the 7.25 degree safe limit. Trial and 
error finds a descend time that would be safe: 
2011-03-27T02:32:51.089Z producing a sun angle < 
6.25 degrees:

[tapley at ena ~]$ ibex_rotate -o -r +359.737 -d 
-0.103 -w ibex-sun -t 2011-03-27T02:32:51.089Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.999988,-0.004590,-0.001798
  which is     R.A. +359.737 Decl.  -0.103
  missing      R.A.   +5.465 Decl.  +2.333 (ibex-sun)
  error is     R.A. +354.272 Decl.  +2.436
  for a total  6.223 deg

	The Descending macros are backed up by 12 
hours to finish at approximately this time.


2) Commented out the Moon-in-FOV commands which 
all take place after the new, earlier time for 
the descending commands and are therefore not 
needed.


	Please check this over very carefully, 
since there are many hand-edits and mental time 
arithmetic imbedded in here.


Sheral,
	I think this is ready to go for the Orbit 
118 ATS, unless one of the isocops says otherwise.

All others,
	comments/corrections welcome.


-- 
						- Mark     210-379-4635
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