[Isocops] IBEX Orbit# 217 ATS (19 Aug 13 - 28 Aug 13) - v001 approval

Thu Aug 8 14:25:53 EDT 2013

All, 

I have looked at the orbit 217 ATS, 

IBEX_2013_231_o0217a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2013_231_o0217a_v001.ccvr. 

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

IBEX_2013_231_o0217a_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_231_o0217a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts at 14 Re ascending and ends about 10 1/2 hours after 15 Re ascending. The initial part of arc A may need despinning because of this outage. The second outage starts about 1 1/2 hours before perigee and ends about 3 1/2 hours after perigee. No despinning should be required due to this outage. 

There is one moon in Lo FOV session. It starts in arc A and ends in arc B. The ATS start time is about 7 1/2 hours after that in the OEF and the ATS end time is about 4 1/4 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_Orbit217Contacts.txt, 

for all contacts (4). 

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 216 left us pointing in safe directions for orbit 217 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.813168,0.537918,0.222263 -w ibex-sun -t 2013/08:20:04:47:39 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.813168,+0.537918,+0.222263 
which is R.A. +146.515 Decl. +12.842 
missing R.A. +149.323 Decl. +12.469 (ibex-sun) 
error is R.A. +2.808 Decl. +0.373 
for a total 2.765 deg 

ibex_rotate -o -u -0.813168,0.537918,0.222263 -w ibex-sun -t 2013/08:23:18:01:06 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.813168,+0.537918,+0.222263 
which is R.A. +146.515 Decl. +12.842 
missing R.A. +152.604 Decl. +11.246 (ibex-sun) 
error is R.A. +6.089 Decl. +1.596 
for a total 6.165 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 -0.854229,0.480901,0.197555 -w ibex-sun -t 2013/08:23:19:44:14 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.854229,+0.480901,+0.197555 
which is R.A. +150.622 Decl. +11.394 
missing R.A. +152.671 Decl. +11.221 (ibex-sun) 
error is R.A. +2.049 Decl. +0.173 
for a total 2.017 deg 

ibex_rotate -o -u -0.854229,0.480901,0.197555 -w ibex-sun -t 2013/08:23:21:19:20 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.854229,+0.480901,+0.197555 
which is R.A. +150.622 Decl. +11.394 
missing R.A. +152.733 Decl. +11.198 (ibex-sun) 
error is R.A. +2.111 Decl. +0.196 
for a total 2.080 deg 

ibex_rotate -o -u -0.854229,0.480901,0.197555 -w ibex-sun -t 2013/08:28:07:22:27 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.854229,+0.480901,+0.197555 
which is R.A. +150.622 Decl. +11.394 
missing R.A. +156.845 Decl. +9.676 (ibex-sun) 
error is R.A. +6.223 Decl. +1.718 
for a total 6.354 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 218 apogee: 

ibex_rotate -o -u -0.892247,0.418168,0.170381 -w ibex-sun -t 2013/08:28:09:24:52 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.892248,+0.418168,+0.170381 
which is R.A. +154.889 Decl. +9.810 
missing R.A. +156.920 Decl. +9.648 (ibex-sun) 
error is R.A. +2.031 Decl. +0.162 
for a total 2.008 deg 

ibex_rotate -o -u -0.892247,0.418168,0.170381 -w ibex-sun -t 2013-09-02T10:52:13.122Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.892248,+0.418168,+0.170381 
which is R.A. +154.889 Decl. +9.810 
missing R.A. +161.443 Decl. +7.819 (ibex-sun) 
error is R.A. +6.554 Decl. +1.991 
for a total 6.775 deg 

No Lo O-mode. 

There is no overlap with orbit 216 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: Tuesday, August 6, 2013 11:10:50 AM 
Subject: [Isocops] IBEX Orbit# 217 ATS (19 Aug 13 - 28 Aug 13) 

Guys, 
Here are the planning files for the Orbit# 217 ATS. 
All approvals, questions/comments are required before 9 Aug 13 @1400 UTC 
Please respond to this email thread with all questions/comments and approvals 

Note the following: 
1. Moon in Lo FOV at APOGEE 
2. Battery Balancing at PERIGEE 
3. Command Load Constraint Violation Report 
# IBEX_2013_231_o0217a_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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