[Isocops] IBEX Orbit# 135a ATS v003 - approve.

Mon Jul 25 13:07:04 EDT 2011

All,
	I have looked at the Orbit 135a ATS v003

IBEX_2011_217_o0135a_v003.txt

and I approve.

	No constraint violations.

	The PL commands in the ATS v003 match the STF v001 file

IBEX_2011_217_o0135a_v001.stf

per Ken's script (Thanks, Ken!).

	PL ascending and descending operations make sense with 
respect to 15 Re ascending, Apogee, and 15 Re descending times from

IBEX_2011_forecast_31jul11-07oct11_v001.oef

	Moon in -Lo FOV PMT setback commands are a little strange. 
The .oef says we need them

2011-08-09T01:32:16.437Z  -  2011-08-09T09:15:32.059Z    and then again
2011-08-09T10:28:07.122Z  -  2011-08-10T14:52:22.340Z.

	The STF has them

2011/08:09:12:05:58       - 2011/08:10:11:24:23

	which is consistent with our usual practice for the second 
period, but skips the first period entirely. I'm guessing that the 
Moon only skims the edge of the -Lo FOV for the first period? In any 
case, I think the danger to -Lo is small from having Moon in FOV.

	No ground station contact times sent; commands in ATS look OK 
assuming the ground contact times match.

	No Battery cell balancing Cycle.

	Inertial maneuver at the end of orbit 134 left us pointing in 
a safe direction for ascending and descending macros during first 
half of orbit:

[tapley at ena ~]$ ibex_rotate -o -u -0.645261,0.705933,0.292055 -w 
ibex-sun -t 2011/08:05:19:55:23
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.645261,+0.705933,+0.292055
  which is     R.A. +132.429 Decl. +16.981
  missing      R.A. +135.337 Decl. +16.960 (ibex-sun)
  error is     R.A.   +2.908 Decl.  +0.021
  for a total  2.782 deg
[tapley at ena ~]$ ibex_rotate -o -u -0.645261,0.705933,0.292055 -w 
ibex-sun -t 2011/08:09:07:07:15
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.645261,+0.705933,+0.292055
  which is     R.A. +132.429 Decl. +16.981
  missing      R.A. +138.691 Decl. +15.944 (ibex-sun)
  error is     R.A.   +6.262 Decl.  +1.037
  for a total  6.094 deg

	Inertial maneuver at apogee leaves us pointing in a safe 
direction at maneuver and at following Ascending and Descending 
Macros.

[tapley at ena ~]$ ibex_rotate -o -u -0.699473,0.660488,0.272935 -w 
ibex-sun -t 2011/08:09:09:02:05
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.699473,+0.660488,+0.272935
  which is     R.A. +136.642 Decl. +15.839
  missing      R.A. +138.768 Decl. +15.920 (ibex-sun)
  error is     R.A.   +2.126 Decl.  +0.081
  for a total  2.047 deg
[tapley at ena ~]$ ibex_rotate -o -u -0.699473,0.660488,0.272935 -w 
ibex-sun -t 2011/08:09:10:26:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.699473,+0.660488,+0.272935
  which is     R.A. +136.642 Decl. +15.839
  missing      R.A. +138.825 Decl. +15.903 (ibex-sun)
  error is     R.A.   +2.182 Decl.  +0.064
  for a total  2.100 deg
[tapley at ena ~]$ ibex_rotate -o -u -0.699473,0.660488,0.272935 -w 
ibex-sun -t 2011/08:13:17:45:35
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.699473,+0.660488,+0.272935
  which is     R.A. +136.642 Decl. +15.839
  missing      R.A. +142.908 Decl. +14.636 (ibex-sun)
  error is     R.A.   +6.266 Decl.  +1.203
  for a total  6.164 deg

	Maneuver at perigee leaves us pointing in a (very) safe 
direction at maneuver and at following Apogee. We will have a worse 
angle wrt solar wind during the first half of Orbit 136, since we are 
not biased late as we usually do, but there are not any good ways to 
correct this without the star tracker for the maneuver.

[tapley at ena ~]$ ibex_rotate -o -r +143.142 -d +14.570 -w ibex-sun -t 
2011/08:14:00:02:21
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.774393,+0.580544,+0.251563
  which is     R.A. +143.142 Decl. +14.570
  missing      R.A. +143.142 Decl. +14.570 (ibex-sun)
  error is     R.A.   +0.000 Decl.  +0.000
  for a total  0.000 deg
[tapley at ena ~]$ ibex_rotate -o -r +143.142 -d +14.570 -w ibex-sun -t 
2011-08-18T16:57:10.086Z
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
  points axis  +1.000000,+0.000000,+0.000000
  towards ECI  -0.774393,+0.580544,+0.251563
  which is     R.A. +143.142 Decl. +14.570
  missing      R.A. +147.529 Decl. +13.072 (ibex-sun)
  error is     R.A.   +4.387 Decl.  +1.498
  for a total  4.516 deg

	No O-mode this orbit.

	No overlaps to orbit 134, either manual check or per 
http://ibex.unh.edu/cgi-bin/ats.cgi.

	Command Approval Checklist attached; Checklist sequence of 
Sun-acq commands is different from ATS (Catbed heater commands) but 
differences are not important.

	Incomplete first edition of Sun-Acq. maneuver checklist attached.

At 13:09 -0400 7/24/11, Ibex Mission Operations wrote:
>Guys,
>     Here is the ATS and planning files for Orbit# 135.
>Approval is needed by 25 July 11 @ 22:02 EDT.
>Please send all questions and approvals to this email thread.

-- 
						- Mark     210-379-4635
-----------------------------------------------------------------------
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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