[Isocops] IBEX Orbit# 121 v001 ATS - approve
Mark Tapley
mtapley at swri.edu
Fri Apr 1 12:30:41 EDT 2011
All,
I have looked at the Orbit 121 ATS v001
(IBEX_2011_102_00_00_v001.txt) and I approve.
The portentious "PL mode unknown" constraint violation
messages appear near the beginning of the orbit, as always. I worry
more about this now than I used to. No other violations.
The PL commands in the ATS v001 match the STF v002 file
(IBEX_2011_102_19_58_v002.stf) which includes -Lo gain scan commands,
per Ken's script (Thanks, Ken!).
PL ascending and descending operations make sense WRT 15 Re
ascending and descending times respectively.
No Moon in -Lo FOV PMT setback commands.
Ground station contact times match S/C transmitter-on times
for all 4 contacts.
No battery cell balancing this odd-numbered orbit.
Inertial sun-pointing maneuver at the end of this orbit
leaves us pointing safe directions at conclusion of the maneuver, at
the following ascending time, and at the descending time following
that (using
http://ibex.unh.edu/ibexhome/doc/isoc/spice/isoc_orbits.html for the
descending time, since no Forecast .oef).
[tapley at ena ~]$ ibex_rotate -o -u
0.8607629652837578,0.46698094380805516,0.20252386455934052 -w
ibex-sun -t 2011/04:20:02:40:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.860763,+0.466981,+0.202524
which is R.A. +28.481 Decl. +11.685
missing R.A. +27.468 Decl. +11.293 (ibex-sun)
error is R.A. +1.012 Decl. +0.391
for a total 1.067 deg
[tapley at ena ~]$ ibex_rotate -o -u
0.8607629652837578,0.46698094380805516,0.20252386455934052 -w
ibex-sun -t 2011-04-20T13:40:37.958Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.860763,+0.466981,+0.202524
which is R.A. +28.481 Decl. +11.685
missing R.A. +27.913 Decl. +11.481 (ibex-sun)
error is R.A. +0.568 Decl. +0.204
for a total 0.593 deg
[tapley at ena ~]$ ibex_rotate -o -u
0.8607629652837578,0.46698094380805516,0.20252386455934052 -w
ibex-sun -t 2011-04-27T17:05:00.000Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.860763,+0.466981,+0.202524
which is R.A. +28.481 Decl. +11.685
missing R.A. +34.610 Decl. +13.818 (ibex-sun)
error is R.A. +6.129 Decl. +2.133
for a total 6.346 deg
No more O-mode.
-Lo gain scan takes place at 17 Re ascending.
At 11:40 -0400 4/1/11, Ibex Mission Operations wrote:
>Guys,
> Here is the ATS and planning files for Orbit# 121. Please
>approve/comment through this email chain by 7am 4 Apr 11.
>The ATS will be uploaded 4 Apr 11 @ 1300 UTC
>
--
- Mark 210-379-4635
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