[Isocops] IBEX Orbit# 221 ATS (25 Sept 13 - 4 Oct 13) - v001 approval

Fri Sep 13 20:38:07 EDT 2013

All, 

I have looked at the orbit 221 ATS, 

IBEX_2013_268_o0221a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2013_268_o0221a_v001.ccvr. 

The PL commands in the v001 ATS match those in the v002 STF, 

IBEX_2013_268_o0221a_v002.stf. 

Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF, 

IBEX_2013_268_o0221a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts about 1 1/2 hours after perigee and ends about 8 hours later. No despinning should be required due to this outage. 

There is one moon in Lo FOV session in arc A. The ATS start time is about 7 hours after that in the OEF and the ATS end time is about 4 hours after that in the OEF. These differences are not unusual. 

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, 

IBEX_Orbit221Contacts.txt, 

for all contacts (3). 

We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands. 

The inertial maneuver at perigee of orbit 220 left us pointing in safe directions for orbit 221 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.99995,0.003299,-0.00946 -w ibex-sun -t 2013/09:26:00:02:34 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.999950,+0.003299,-0.009460 
which is R.A. +179.811 Decl. -0.542 
missing R.A. +182.621 Decl. -1.137 (ibex-sun) 
error is R.A. +2.810 Decl. +0.595 
for a total 2.872 deg 

ibex_rotate -o -u -0.99995,0.003299,-0.00946 -w ibex-sun -t 2013/09:29:17:58:42 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.999950,+0.003299,-0.009460 
which is R.A. +179.811 Decl. -0.542 
missing R.A. +185.935 Decl. -2.603 (ibex-sun) 
error is R.A. +6.124 Decl. +2.061 
for a total 6.459 deg 

The inertial maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for arc B ascending and descending sequences: 

ibex_rotate -o -u -0.996737,-0.069489,-0.041073 -w ibex-sun -t 2013/09:29:19:41:50 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.996737,-0.069489,-0.041073 
which is R.A. +183.988 Decl. -2.354 
missing R.A. +186.000 Decl. -2.631 (ibex-sun) 
error is R.A. +2.012 Decl. +0.277 
for a total 2.029 deg 

ibex_rotate -o -u -0.996737,-0.069489,-0.041073 -w ibex-sun -t 2013/09:29:21:16:56 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.996737,-0.069489,-0.041073 
which is R.A. +183.988 Decl. -2.354 
missing R.A. +186.061 Decl. -2.657 (ibex-sun) 
error is R.A. +2.073 Decl. +0.303 
for a total 2.093 deg 

ibex_rotate -o -u -0.996737,-0.069489,-0.041073 -w ibex-sun -t 2013/10:04:11:32:44 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.996737,-0.069489,-0.041073 
which is R.A. +183.988 Decl. -2.354 
missing R.A. +190.342 Decl. -4.445 (ibex-sun) 
error is R.A. +6.354 Decl. +2.091 
for a total 6.678 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 222 apogee: 

ibex_rotate -o -u -0.986774,-0.144482,-0.073499 -w ibex-sun -t 2013/10:04:13:44:25 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.986774,-0.144482,-0.073499 
which is R.A. +188.330 Decl. -4.215 
missing R.A. +190.426 Decl. -4.479 (ibex-sun) 
error is R.A. +2.096 Decl. +0.264 
for a total 2.107 deg 

ibex_rotate -o -u -0.986774,-0.144482,-0.073499 -w ibex-sun -t 2013-10-09T14:05:27.138Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.986774,-0.144482,-0.073499 
which is R.A. +188.330 Decl. -4.215 
missing R.A. +194.884 Decl. -6.389 (ibex-sun) 
error is R.A. +6.554 Decl. +2.174 
for a total 6.878 deg 

No Lo O-mode. 

There is no overlap with orbit 220 commands by manual inspection or by checking at 

http://ibex.unh.edu/cgi-bin/ats.cgi . 

Command Approval Checklist is attached. 

Ken 
----- Original Message -----
From: "Ibex Mission Operations" <ibexops at gmail.com> 
To: "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Ken Fairchild" <fair-play at comcast.net>, "Mark Tapley" <mtapley at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Roland Vanderspek" <roland at space.mit.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Tim Perry" <perry.tim at orbital.com> 
Sent: Thursday, September 12, 2013 7:56:13 AM 
Subject: IBEX Orbit# 221 ATS (25 Sept 13 - 4 Oct 13) 

Guys, 
Here are the planning files and ATS for Orbit# 221. 
Please respond to this email thread with any questions or comments. 
All questions, comments and approvals are required before 14 Sept 13 @1400 UTC 

Note the following 
1. Battery balancing at PERIGEE 
2. Moon in Lo FOV 
2013-09-26T09:27:57.772Z,MoonInLoFovStart,orbit:221 
2013-09-27T06:55:41.129Z,MoonInLoFovStop,orbit:221 
3. Command Load Constraint Violation Report (CCVR) 
IBEX_2013_268_o0221a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

-- 
Sheral R. Wesley 
SPVR., Satellite Operations 
IBEX Mission OPS 
(304) 279-6678 
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