[Isocops] IBEX Orbit# 226 ATS (11 Nov 13 - 20 Nov 13) - v001 approval

Thu Oct 31 21:11:18 EDT 2013

All, 

I have looked at the orbit 226 ATS, 

IBEX_2013_315_o0226a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2013_315_o0226a_v001.ccvr. 

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

IBEX_2013_315_o0226a_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_315_o0226a_v001.oef, 

and as verified with ibex_orbit. 

There are three star tracker outages. The first starts about 7 hours after the orbit 225 perigee and ends about 16 hours later. The second starts about 19 hours after the first outage ends and runs for almost 48 hours. Arc A will need despinning because of these two outages. The third outage starts about 9 hours after the orbit 226 perigee and ends about an hour later. No despinning should be required due to this outage. 

There are no moon in Lo FOV sessions. 

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

IBEX_Orbit226Contacts.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 225 left us pointing in safe directions for orbit 226 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.691055,-0.659141,-0.296608 -w ibex-sun -t 2013/11:11:16:36:13 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.691055,-0.659141,-0.296608 
which is R.A. +223.646 Decl. -17.254 
missing R.A. +226.817 Decl. -17.542 (ibex-sun) 
error is R.A. +3.171 Decl. +0.288 
for a total 3.039 deg 

ibex_rotate -o -u -0.691055,-0.659141,-0.296608 -w ibex-sun -t 2013/11:15:07:33:55 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.691055,-0.659141,-0.296608 
which is R.A. +223.646 Decl. -17.254 
missing R.A. +230.389 Decl. -18.503 (ibex-sun) 
error is R.A. +6.743 Decl. +1.249 
for a total 6.537 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 -0.630564,-0.708053,-0.317884 -w ibex-sun -t 2013/11:15:09:17:03 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.630564,-0.708053,-0.317884 
which is R.A. +228.313 Decl. -18.535 
missing R.A. +230.462 Decl. -18.521 (ibex-sun) 
error is R.A. +2.149 Decl. +0.014 
for a total 2.038 deg 

ibex_rotate -o -u -0.630564,-0.708053,-0.317884 -w ibex-sun -t 2013/11:15:10:52:09 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.630564,-0.708053,-0.317884 
which is R.A. +228.313 Decl. -18.535 
missing R.A. +230.529 Decl. -18.538 (ibex-sun) 
error is R.A. +2.216 Decl. +0.003 
for a total 2.101 deg 

ibex_rotate -o -u -0.630564,-0.708053,-0.317884 -w ibex-sun -t 2013/11:19:21:29:05 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.630564,-0.708053,-0.317884 
which is R.A. +228.313 Decl. -18.535 
missing R.A. +235.254 Decl. -19.602 (ibex-sun) 
error is R.A. +6.941 Decl. +1.067 
for a total 6.646 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 227 apogee: 

ibex_rotate -o -u -0.566295,-0.752181,-0.336947 -w ibex-sun -t 2013/11:19:23:46:56 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.566295,-0.752181,-0.336947 
which is R.A. +233.025 Decl. -19.691 
missing R.A. +235.360 Decl. -19.624 (ibex-sun) 
error is R.A. +2.336 Decl. +0.067 
for a total 2.200 deg 

ibex_rotate -o -u -0.566295,-0.752181,-0.336947 -w ibex-sun -t 2013-11-25T01:22:05.301Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.566295,-0.752181,-0.336947 
which is R.A. +233.025 Decl. -19.691 
missing R.A. +240.557 Decl. -20.717 (ibex-sun) 
error is R.A. +7.532 Decl. +1.027 
for a total 7.142 deg 

No Lo O-mode. 

There is no overlap with orbit 225 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: joe at boulder.swri.edu, "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: Tuesday, October 29, 2013 12:53:27 PM 
Subject: IBEX Orbit# 226 ATS (11 Nov 13 - 20 Nov 13) 

Guys, 
Here are the planning files and ATS for Orbit# 226. 
Please respond to this email thread with your questions, comments and approvals. 
Approvals are required by 1 Nov 13 @ 1200 UTC 

Note the following: 
1. Battery Balancing Commands at PERIGEE 
2. Command Load Constraint Violation Report (CCVR) 
# IBEX_2013_315_o0226a_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 
CYGNUS Mission Planning 
(304) 279-6678 
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