[Isocops] IBEX Orbit# 271 ATS (24 Dec 14 - 2 Jan 15) - v001 approval

Fri Dec 12 23:21:44 EST 2014

All, 

I have looked at the orbit 271 ATS, 

IBEX_2014_358_o0271a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_358_o0271a_v001.ccvr. 

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

IBEX_2014_358_o0271a_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_2014_358_o0271a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts about 18 hours after 15 Re ascending and ends 2+ days later. The second starts about 1 1/2 days after apogee and ends just before 15 Re descending. Some despinning may be required due to these outages. 

There is one moon in Lo FOV session in arc A. The ATS start time is about two hours after that in the OEF and the ATS end time is about 1/2 hour 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_Orbit271Contacts.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 270 left us pointing in safe directions for the orbit 271 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.068614,-0.944733,-0.32058 -w ibex-sun -t 2014/12:25:04:47:30 

Quaternion +0.000000,+0.000000,+0.000000,+0.000000 

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.068614,-0.944733,-0.320580 

which is R.A. +274.154 Decl. -18.698 

missing R.A. +273.413 Decl. -23.406 (ibex-sun) 

error is R.A. +0.741 Decl. +4.708 

for a total 4.759 deg 

ibex_rotate -o -u 0.068614,-0.944733,-0.32058 -w ibex-sun -t 2014/12:28:20:12:58 

Quaternion +0.000000,+0.000000,+0.000000,+0.000000 

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.068614,-0.944733,-0.320580 

which is R.A. +274.154 Decl. -18.698 

missing R.A. +277.359 Decl. -23.301 (ibex-sun) 

error is R.A. +3.205 Decl. +4.603 

for a total 5.489 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 0.139358,-0.937843,-0.317851 -w ibex-sun -t 2014/12:28:21:56:06 

Quaternion +0.000000,+0.000000,+0.000000,+0.000000 

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.139358,-0.937843,-0.317851 

which is R.A. +278.452 Decl. -18.533 

missing R.A. +277.437 Decl. -23.297 (ibex-sun) 

error is R.A. +1.015 Decl. +4.764 

for a total 4.857 deg 

ibex_rotate -o -u 0.139358,-0.937843,-0.317851 -w ibex-sun -t 2014/12:28:23:31:12 

Quaternion +0.000000,+0.000000,+0.000000,+0.000000 

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.139358,-0.937843,-0.317851 

which is R.A. +278.452 Decl. -18.533 

missing R.A. +277.509 Decl. -23.293 (ibex-sun) 

error is R.A. +0.943 Decl. +4.760 

for a total 4.841 deg 

ibex_rotate -o -u 0.139358,-0.937843,-0.317851 -w ibex-sun -t 2015/01:02:10:18:12 

Quaternion +0.000000,+0.000000,+0.000000,+0.000000 

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.139358,-0.937843,-0.317851 

which is R.A. +278.452 Decl. -18.533 

missing R.A. +282.447 Decl. -22.934 (ibex-sun) 

error is R.A. +3.995 Decl. +4.401 

for a total 5.773 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 272 apogee: 

ibex_rotate -o -u 0.229904,-0.922231,-0.310859 -w ibex-sun -t 2015/01:02:12:32:34 

Quaternion +0.000000,+0.000000,+0.000000,+0.000000 

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.229904,-0.922231,-0.310859 

which is R.A. +283.998 Decl. -18.111 

missing R.A. +282.558 Decl. -22.925 (ibex-sun) 

error is R.A. +1.440 Decl. +4.814 

for a total 4.999 deg 

ibex_rotate -o -u 0.229904,-0.922231,-0.310859 -w ibex-sun -t 2015-01-07T15:11:26.532Z 

Quaternion +0.000000,+0.000000,+0.000000,+0.000000 

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.229904,-0.922231,-0.310859 

which is R.A. +283.998 Decl. -18.111 

missing R.A. +288.152 Decl. -22.423 (ibex-sun) 

error is R.A. +4.154 Decl. +4.312 

for a total 5.811 deg 

No Lo O-mode. 

There is no overlap with orbit 270 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: "Harold Kucharek" <Harald.Kucharek at unh.edu>, "IBEX FDG" <ibex at applieddefense.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Marty Quinn" <marty.quinn at unh.edu>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Paul Janzen" <paul.janzen at umontana.edu>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Tim Perry" <perry.tim at orbital.com> 
Sent: Wednesday, December 10, 2014 11:54:44 PM 
Subject: IBEX Orbit# 271 ATS (24 Dec 14 - 2 Jan 15) 

Guys, 
Here are the planning file and ATS for Orbit# 271. Please respond to this email thread with questions and approvals. 
Approvals are required before 14 Dec 14 @1400 UTC 
Note the following: 
1. Battery Balancing at Perigee 
2015-01-02T22:04:02.960Z,Perigee,orbit:271 
SetLongEclipseFlag TRUE $TIME=2015/01:02:20:30:00 
SetLongEclipseFlag FALSE $TIME=2015/01:02:22:00:00 

2. Moon in Lo FOV 
2014-12-26T01:07:51.585Z,MoonInLoFovStart,orbit:271 
2014-12-26T15:48:00.843Z,MoonInLoFovStop,orbit:271 
-- 
Sheral R. Wesley 
SPVR., Satellite Operations 
IBEX Mission OPS 
CYGNUS Mission Planning 
(304) 279-6678 

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