[Isocops] IBEX Orbit# 225 ATS (1 Nov 13 - 11 Nov 13) - v001 approval

Ken Fairchild fair-play at comcast.net
Tue Oct 22 22:18:53 EDT 2013


All, 


I have looked at the orbit 225 ATS, 


IBEX_2013_305_o0225a_v001.scr, 


and I approve. 


The constraint violation in 


IBEX_2013_305_o0225a_v001.ccvr 


is caused by a problem in MPS related to perigees above 10 Re. 


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


IBEX_2013_305_o0225a_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_305_o0225a_v001.oef, 


and as verified with ibex_orbit. 


There are two star tracker outages. The first starts about six hours after the orbit 224 perigee and ends about 8 hours after 15 Re ascending. The second starts about 7 hours after perigee and ends about 3 hours later. The first part of arc A may need despinning because of the first outage. 


There is one moon in Lo FOV session in arc B. The ATS start time is about 45 minutes after that in the OEF and the end times in the ATS and OEF are within seconds of each other. The timing differences are not unusual. 


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


IBEX_Orbit225Contacts.txt, 


for all contacts (2). 


The inertial maneuver at perigee of orbit 224 left us pointing in safe directions for orbit 225 arc A ascending and descending sequences: 



ibex_rotate -o -u -0.798028,-0.548859,-0.248808 -w ibex-sun -t 2013/11:02:11:09:06 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.798028,-0.548859,-0.248808 
which is R.A. +214.519 Decl. -14.407 
missing R.A. +217.595 Decl. -14.814 (ibex-sun) 
error is R.A. +3.076 Decl. +0.407 
for a total 3.004 deg 



ibex_rotate -o -u -0.798028,-0.548859,-0.248808 -w ibex-sun -t 2013/11:06:02:54:12 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.798028,-0.548859,-0.248808 
which is R.A. +214.519 Decl. -14.407 
missing R.A. +221.091 Decl. -15.939 (ibex-sun) 
error is R.A. +6.572 Decl. +1.532 
for a total 6.525 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 -0.747005,-0.605906,-0.273607 -w ibex-sun -t 2013/11:06:04:37:20 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.747005,-0.605906,-0.273607 
which is R.A. +219.046 Decl. -15.879 
missing R.A. +221.162 Decl. -15.961 (ibex-sun) 
error is R.A. +2.116 Decl. +0.081 
for a total 2.037 deg 



ibex_rotate -o -u -0.747005,-0.605906,-0.273607 -w ibex-sun -t 2013/11:06:06:12:26 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.747005,-0.605906,-0.273607 
which is R.A. +219.046 Decl. -15.879 
missing R.A. +221.228 Decl. -15.980 (ibex-sun) 
error is R.A. +2.182 Decl. +0.101 
for a total 2.100 deg 



ibex_rotate -o -u -0.747005,-0.605906,-0.273607 -w ibex-sun -t 2013/11:10:17:17:19 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.747005,-0.605906,-0.273607 
which is R.A. +219.046 Decl. -15.879 
missing R.A. +225.837 Decl. -17.269 (ibex-sun) 
error is R.A. +6.791 Decl. +1.390 
for a total 6.655 deg 


The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 226 apogee: 



ibex_rotate -o -u -0.691055,-0.659141,-0.296608 -w ibex-sun -t 2013/11:10:19:36:00 
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. +225.940 Decl. -17.297 (ibex-sun) 
error is R.A. +2.294 Decl. +0.043 
for a total 2.191 deg 



ibex_rotate -o -u -0.691055,-0.659141,-0.296608 -w ibex-sun -t 2013-11-15T19:07:02.368Z 
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. +230.882 Decl. -18.624 (ibex-sun) 
error is R.A. +7.236 Decl. +1.370 
for a total 7.018 deg 


No Lo O-mode. 


There is no overlap with orbit 224 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: Sunday, October 20, 2013 10:10:49 PM 
Subject: IBEX Orbit# 225 ATS (1 Nov 13 - 11 Nov 13) 


Guys, 
Here are the planning files for Orbit# 225 and the ATS 
Please responf to this thread with you comments and questions. 
All approvals are required before 1200 UTC on 23 Oct 13 

Note the following 
1. No battery balancing commands this orbit 
2. Eclipse 
# Orbit# 225 Eclipse 
# 2013-11-10T12:52:43.819Z,EclipseEntry,orbit:225,moderate:false,long:false 
# 2013-11-10T13:16:22.581Z,EclipseExit,orbit:225,moderate:false,long:false 
3. Moon in Lo FOV 
# Orbit# 225 Moon in Lo FOV 
# 2013-11-10T12:56:52.898Z,MoonInLoFovStart,orbit:225 
# 2013-11-10T13:16:22.581Z,PenumbraExit,orbit:225 
4. Command Load Constraint Violation Report (CCVR) 
IBEX_2013_305_o0225a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
IBX-CLC-008: Spacecraft state is HK during interval 2013/11/02 09:29:00 UTC - 
2013/11/02 09:30:12 UTC, which overlaps HVSCI payload mode at 
2013/11/02 09:29:00 UTC - 2013/11/02 11:09:06 UTC 

* MPS is looking for the 10_re Descending and Ascending crossings at PERIGEE. 
We have been been above 10_Re since Orbit# 223 and will remain there until 8 Dec 13. 

============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 


-- 

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