[Isocops] Fwd: STF for Orbits 0129-30

[Mark Tapley]

All,
	Ken's edited .stf files for Orbits 129 and 130, 
IBEX_2011_163_o0129a_v001.stf and IBEX_2011_172_o0130a_v001.stf for 
have appeared.
	Orbit 129's pointing vector,

0.042788,0.92168,0.385584

	is appropriate and safe for any time from now (June 16, 1423 
UTC) until sometime after the Descending macros prior to the Orbit 
130 apogee maneuver at 2011-06-25T14:01:00.000Z.


[tapley at ena ~]$ ibex_rotate -o -u 0.042788,0.92168,0.385584 -w 
ibex-sun -t 2011-06-16T14:23:08.000Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.042788,+0.921680,+0.385584
  which is     R.A.  +87.342 Decl. +22.680
  missing      R.A.  +84.613 Decl. +23.322 (ibex-sun)
  error is     R.A.   +2.729 Decl.  +0.642
  for a total  2.593 deg
[tapley at ena ~]$ ibex_rotate -o -u 0.042788,0.92168,0.385584 -w 
ibex-sun -t 2011-06-22T02:33:09.000Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.042788,+0.921680,+0.385584
  which is     R.A.  +87.342 Decl. +22.680
  missing      R.A.  +90.219 Decl. +23.450 (ibex-sun)
  error is     R.A.   +2.877 Decl.  +0.770
  for a total  2.757 deg
[tapley at ena ~]$ ibex_rotate -o -u 0.042788,0.92168,0.385584 -w 
ibex-sun -t 2011-06-25T13:27:10.000Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  +0.042788,+0.921680,+0.385584
  which is     R.A.  +87.342 Decl. +22.680
  missing      R.A.  +93.918 Decl. +23.366 (ibex-sun)
  error is     R.A.   +6.576 Decl.  +0.686
  for a total  6.090 deg

	In each case, Sun is appx. 0.7 deg north of the target 
vector, so the resulting actually achieved vector for a normal weekly 
repoint would be on the ecliptic. However, for the first maneuver 
after the Delta-V, if we are coming from our Delta-V pointing vector 
at ~RA 59, Dec 43, we need to think about a different offset unless 
we want to do a two-part slew, going first to ~RA 80, Dec 22.6 first 
and then to the target vector, RA 87, Dec 22.6 .

	To preserve the procedure intact (after talking with Chelle) 
I'll generate a new offset pointing vector and distribute to the 
ibex-maneuver-engineering at lists.sr.unh.edu list for confirmation.

	Ascent and descent macro times in 130a make sense wrt 15 Re 
times as given in PreADV2_MAC_Slides.pdf. However I note we are out 
of HV for 23 hours around apogee, which seems long.

	Moon-in-FOV setback commands appear in the STF; I have not 
checked lunar predictions from .oef.

	I think the ATS needs an updated target vector (see above).

-- 
						- Mark     210-379-4635
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