[Isocops] IBEX Orbit# 126 v002 ATS - approve
Mark Tapley
mtapley at swri.edu
Tue May 10 11:56:30 EDT 2011
All,
I have looked at the Orbit 126 ATS v002
(IBEX_2011_140_00_00_v002.scr) and I approve. Diff shows the only
difference is addition of the battery cell balancing commands, which
are OK. Sorry about my previous message, which referenced v001 and
v002 in mixed-up sequence; v002 is good. Revised checklist attached
as well.
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. Ascending
BUS and PL commands begin 3 minutes before 10 Re.
The PL commands in the ATS v002 match the STF v001 file
(IBEX_2011_140_23_13_v001.stf), per Ken's script (Thanks, Ken!).
PL ascending and descending operations make sense with
respect to 15 Re ascending and descending times respectively.
Moon in -Lo FOV PMT setback commands are concentric with
times in the .oef and about 1 hour inside the .oef times, as usual.
Ground station contact times match S/C transmitter-on times
for all 4 contacts.
Battery cell balancing commands are in place for this
even-numbered orbit, and are more than an hour from anything.
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.
[tapley at ena ~]$ ibex_rotate -o -u
0.3789135096089718,0.8490897984687159,0.3680639433198629 -w ibex-sun
-t 2011/05:28:13:01:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.378914,+0.849090,+0.368064
which is R.A. +65.951 Decl. +21.596
missing R.A. +64.886 Decl. +21.421 (ibex-sun)
error is R.A. +1.065 Decl. +0.175
for a total 1.006 deg
[tapley at ena ~]$ ibex_rotate -o -u
0.3789135096089718,0.8490897984687159,0.3680639433198629 -w ibex-sun
-t 2011-05-29T03:40:39.831Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.378914,+0.849090,+0.368064
which is R.A. +65.951 Decl. +21.596
missing R.A. +65.521 Decl. +21.535 (ibex-sun)
error is R.A. +0.430 Decl. +0.062
for a total 0.405 deg
[tapley at ena ~]$ ibex_rotate -o -u
0.3789135096089718,0.8490897984687159,0.3680639433198629 -w ibex-sun
-t 2011-06-04T22:53:59.065Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.378914,+0.849090,+0.368064
which is R.A. +65.951 Decl. +21.596
missing R.A. +72.488 Decl. +22.445 (ibex-sun)
error is R.A. +6.537 Decl. +0.849
for a total 6.119 deg
No more O-mode.
No overlap with Orbit 125 commands, per
http://ibex.unh.edu/cgi-bin/ats.cgi .
Command Approval Checklist attached.
At 10:39 -0400 5/10/11, Ibex Mission Operations wrote:
>Guys,
> Here is the ATs for Orbit# 126. It contains battery balancing
>and moon in fov commands.
>Please review V002 of the ATS for approval/comments by 12pm 12 May
>11 and send comments to this email thread.
--
- Mark 210-379-4635
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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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