[Isocops] IBEX ATS Orbit# 220 (16 Sept 13 - 25 Sept 13) - v001 approval

Thu Sep 5 01:53:12 EDT 2013

All, 

I have looked at the orbit 220 ATS, 

IBEX_2013_259_o0220a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2013_259_o0220a_v001.ccvr. 

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

IBEX_2013_259_o0220a_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_259_o0220a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts at 14 Re ascending and ends about 32 hours later. The second starts about an hour after perigee and ends about 7 hours later. Despinning of arc A may be required due to the first outage. No despinning should be required due to the second outage. 

There is one moon in Lo FOV session in arc B. The ATS start time is about 3 hours after that in the OEF and the ATS end time is about 1 1/2 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_Orbit220Contacts.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 219 left us pointing in safe directions for orbit 220 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.987707,0.147103,0.052876 -w ibex-sun -t 2013/09:16:18:05:29 
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. +174.317 Decl. +2.456 (ibex-sun) 
error is R.A. +2.788 Decl. +0.575 
for a total 2.844 deg 

ibex_rotate -o -u -0.987707,0.147103,0.052876 -w ibex-sun -t 2013/09:20:08:58:08 
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. +177.517 Decl. +1.040 (ibex-sun) 
error is R.A. +5.988 Decl. +1.991 
for a total 6.307 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 -0.996768,0.077117,0.022495 -w ibex-sun -t 2013/09:20:10:41:16 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.996768,+0.077117,+0.022495 
which is R.A. +175.576 Decl. +1.289 
missing R.A. +177.582 Decl. +1.011 (ibex-sun) 
error is R.A. +2.006 Decl. +0.278 
for a total 2.025 deg 

ibex_rotate -o -u -0.996768,0.077117,0.022495 -w ibex-sun -t 2013/09:20:12:16:22 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.996768,+0.077117,+0.022495 
which is R.A. +175.576 Decl. +1.289 
missing R.A. +177.642 Decl. +0.985 (ibex-sun) 
error is R.A. +2.066 Decl. +0.304 
for a total 2.088 deg 

ibex_rotate -o -u -0.996768,0.077117,0.022495 -w ibex-sun -t 2013/09:25:00:28:12 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.996768,+0.077117,+0.022495 
which is R.A. +175.576 Decl. +1.289 
missing R.A. +181.795 Decl. -0.773 (ibex-sun) 
error is R.A. +6.219 Decl. +2.062 
for a total 6.551 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 221 apogee: 

ibex_rotate -o -u -0.99995,0.003299,-0.00946 -w ibex-sun -t 2013/09:25:02:39:03 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.999950,+0.003299,-0.009460 
which is R.A. +179.811 Decl. -0.542 
missing R.A. +181.876 Decl. -0.807 (ibex-sun) 
error is R.A. +2.065 Decl. +0.265 
for a total 2.082 deg 

ibex_rotate -o -u -0.99995,0.003299,-0.00946 -w ibex-sun -t 2013-09-30T05:32:36.986Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.999950,+0.003299,-0.009460 
which is R.A. +179.811 Decl. -0.542 
missing R.A. +186.376 Decl. -2.793 (ibex-sun) 
error is R.A. +6.565 Decl. +2.251 
for a total 6.937 deg 

No Lo O-mode. 

There is no overlap with orbit 219 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: Monday, September 2, 2013 8:45:39 PM 
Subject: IBEX ATS Orbit# 220 (16 Sept 13 - 25 Sept 13) 

Guys, 
Here are the planning files and ATS for Orbit# 220. 
All comments and approvals are required before 5 Sept 13 @1200 UTC. 
Please respond to this email thread with your comments and approvals. 

Note the following: 
1. Battery Balancing at PERIGEE 
2. Moon in Lo FOV 
2013-09-21T23:14:53.312Z,MoonInLoFovStart,orbit:220 
2013-09-24T16:28:21.503Z,MoonInLoFovStop,orbit:220 
3. Command Load Constraint Violation Report (CCVR) 
# IBEX_2013_259_o0220a_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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