[Isocops] IBEX ORbit# 227 ATS (20 Nov 13 - 29 Nov 13) - v001 approval

Sun Nov 10 09:23:20 EST 2013

All, 

I have looked at the orbit 227 ATS, 

IBEX_2013_324_o0227a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2013_324_o0227a_v001.ccvr. 

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

IBEX_2013_324_o0227a_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_324_o0227a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts about 9 hours after the orbit 226 perigee and ends about 19 hours later. Some despinning may be required due to this outage. 

There is one moon in Lo FOV session in arc B. The ATS start time is about 2 hours after that in the OEF and the ATS end time is about 4 hours before that in the OEF. These differences are not unusual. The OEF contains another moon in Lo FOV session but it starts just before the apogee maneuver window opens and ends during the maneuver. 

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

IBEX_Orbit227Contacts.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 226 left us pointing in safe directions for orbit 227 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.566295,-0.752181,-0.336947 -w ibex-sun -t 2013/11:20:20:49:26 
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. +236.281 Decl. -19.829 (ibex-sun) 
error is R.A. +3.256 Decl. +0.138 
for a total 3.067 deg 

ibex_rotate -o -u -0.566295,-0.752181,-0.336947 -w ibex-sun -t 2013/11:24:13:48:24 
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. +240.051 Decl. -20.623 (ibex-sun) 
error is R.A. +7.026 Decl. +0.932 
for a total 6.660 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 -0.49622,-0.792516,-0.35452 -w ibex-sun -t 2013/11:24:15:31:32 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.496220,-0.792516,-0.354520 
which is R.A. +237.948 Decl. -20.764 
missing R.A. +240.126 Decl. -20.637 (ibex-sun) 
error is R.A. +2.178 Decl. +0.127 
for a total 2.041 deg 

ibex_rotate -o -u -0.49622,-0.792516,-0.35452 -w ibex-sun -t 2013/11:24:17:06:38 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.496220,-0.792516,-0.354520 
which is R.A. +237.948 Decl. -20.764 
missing R.A. +240.195 Decl. -20.650 (ibex-sun) 
error is R.A. +2.247 Decl. +0.114 
for a total 2.105 deg 

ibex_rotate -o -u -0.49622,-0.792516,-0.35452 -w ibex-sun -t 2013/11:29:05:39:53 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.496220,-0.792516,-0.354520 
which is R.A. +237.948 Decl. -20.764 
missing R.A. +245.135 Decl. -21.466 (ibex-sun) 
error is R.A. +7.187 Decl. +0.702 
for a total 6.741 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 228 apogee: 

ibex_rotate -o -u -0.423592,-0.827094,-0.369439 -w ibex-sun -t 2013/11:29:07:56:27 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.423592,-0.827094,-0.369439 
which is R.A. +242.881 Decl. -21.681 
missing R.A. +245.244 Decl. -21.482 (ibex-sun) 
error is R.A. +2.363 Decl. +0.199 
for a total 2.207 deg 

ibex_rotate -o -u -0.423592,-0.827094,-0.369439 -w ibex-sun -t 2013-12-04T07:05:12.844Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.423592,-0.827094,-0.369439 
which is R.A. +242.881 Decl. -21.681 
missing R.A. +250.489 Decl. -22.260 (ibex-sun) 
error is R.A. +7.608 Decl. +0.579 
for a total 7.079 deg 

No Lo O-mode. 

There is no overlap with orbit 226 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>, "Ed Fleming" <Fleming.Ed at orbital.com> 
Sent: Thursday, November 7, 2013 1:03:44 PM 
Subject: IBEX ORbit# 227 ATS (20 Nov 13 - 29 Nov 13) 

Guys, 
Here are the planning files and ATS for Orbit# 227. 
Please respond to this email thread with your comments and questions. 
All approvals are required before 11 Nov 13 @0800 UTC 

1. Battery Balancing this PERIGEE 
2. Command Load Constraint Violation Report 
# IBEX_2013_324_o0227a_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 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.sr.unh.edu/mailman/private/isocops/attachments/20131110/60edb4a4/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IBEX-Command-Approval-Checklist-Rev12a-o0227_KWF.doc
Type: application/msword
Size: 83968 bytes
Desc: not available
Url : http://lists.sr.unh.edu/mailman/private/isocops/attachments/20131110/60edb4a4/IBEX-Command-Approval-Checklist-Rev12a-o0227_KWF-0001.doc 