[Isocops] IBEX Orbit# 219 ATS (7 Sept 13 - 16 Sept 13) - v001 approval

Sun Aug 25 22:01:19 EDT 2013

All, 

I have looked at the orbit 219 ATS, 

IBEX_2013_250_o0219a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2013_250_o0219a_v001.ccvr. 

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

IBEX_2013_250_o0219a_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 file, 

IBEX_2013_250_o0219a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts just before perigee and ends about 6 hours after perigee. No despinning should be required due to this outage. 

There is one moon in Lo FOV session in arc B. The ATS start time is about an hour after that in the OEF and the ATS end time is about 2 hours before 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_Orbit219Contacts.txt, 

for all contacts (4). 

No battery cell balancing this orbit; we'll do it again in the next orbit. 

The inertial maneuver at perigee of orbit 218 left us pointing in safe directions for orbit 219 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.951794,0.285262,0.112752 -w ibex-sun -t 2013/09:07:14:28:02 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.951794,+0.285262,+0.112752 
which is R.A. +163.316 Decl. +6.474 
missing R.A. +166.098 Decl. +5.943 (ibex-sun) 
error is R.A. +2.782 Decl. +0.531 
for a total 2.816 deg 

ibex_rotate -o -u -0.951794,0.285262,0.112752 -w ibex-sun -t 2013/09:11:04:28:35 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.951794,+0.285262,+0.112752 
which is R.A. +163.316 Decl. +6.474 
missing R.A. +169.293 Decl. +4.569 (ibex-sun) 
error is R.A. +5.977 Decl. +1.905 
for a total 6.247 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 -0.972284,0.218311,0.083695 -w ibex-sun -t 2013/09:11:06:11:43 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.972284,+0.218311,+0.083695 
which is R.A. +167.345 Decl. +4.801 
missing R.A. +169.359 Decl. +4.541 (ibex-sun) 
error is R.A. +2.014 Decl. +0.260 
for a total 2.024 deg 

ibex_rotate -o -u -0.972284,0.218311,0.083695 -w ibex-sun -t 2013/09:11:07:46:49 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.972284,+0.218311,+0.083695 
which is R.A. +167.345 Decl. +4.801 
missing R.A. +169.419 Decl. +4.515 (ibex-sun) 
error is R.A. +2.074 Decl. +0.286 
for a total 2.087 deg 

ibex_rotate -o -u -0.972284,0.218311,0.083695 -w ibex-sun -t 2013/09:15:18:16:20 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.972284,+0.218311,+0.083695 
which is R.A. +167.345 Decl. +4.801 
missing R.A. +173.492 Decl. +2.816 (ibex-sun) 
error is R.A. +6.147 Decl. +1.984 
for a total 6.446 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 220 apogee: 

ibex_rotate -o -u -0.987707,0.147103,0.052876 -w ibex-sun -t 2013/09:15:20:21:20 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.987707,+0.147103,+0.052876 
which is R.A. +171.529 Decl. +3.031 
missing R.A. +173.569 Decl. +2.785 (ibex-sun) 
error is R.A. +2.040 Decl. +0.246 
for a total 2.052 deg 

ibex_rotate -o -u -0.987707,0.147103,0.052876 -w ibex-sun -t 2013-09-20T20:31:15.457Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.987707,+0.147103,+0.052876 
which is R.A. +171.529 Decl. +3.031 
missing R.A. +177.956 Decl. +0.850 (ibex-sun) 
error is R.A. +6.427 Decl. +2.181 
for a total 6.783 deg 

No Lo O-mode. 

There is no overlap with orbit 218 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: "Bret Hautamaki" <hautamaki.bret at orbital.com>, "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>, "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: Saturday, August 24, 2013 12:06:17 PM 
Subject: [Isocops] IBEX Orbit# 219 ATS (7 Sept 13 - 16 Sept 13) 

Guys, 
Here are the planning files for Orbit# 219. 
Please respond to this email thread with any comments/questions and approvals. 
All approvals are required before 27 Aug 13 @ 1400 UTC 

Note the following: 
1. No Battery Balancing commands this Orbit 
2. Moon in Lo FOV 
# 2013-09-14T08:16:50.889Z,MoonInLoFovStart,orbit:219 
# 2013-09-14T23:12:37.330Z,MoonInLoFovStop,orbit:219 
3. Command Load Constraint Violation Report (CCVR) 
IBEX_2013_250_o0219a_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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