[Isocops] IBEX Orbit# 275 ATS (30 Jan 15 - 9 Feb 15) - v002 approval

Tue Jan 20 16:45:43 EST 2015

All, 

Note: Angle at descending after the apogee sun precession maneuver: 4.193 deg 

I have looked at the orbit 275 ATS, 

IBEX_2015_030_o0275a_v002.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2015_030_o0275a_v002.ccvr. 

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

IBEX_2015_030_o0275a_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_2015_030_o0275a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts 2+ days before apogee and ends 2- days before 15 Re descending. Some despinning may 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_Orbit275Contacts.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 274 left us pointing in safe directions for the orbit 275 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.662769,-0.7154,-0.221225 -w ibex-sun -t 2015/01:31:05:52:18 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.662769,-0.715400,-0.221225 

which is R.A. +312.813 Decl. -12.781 

missing R.A. +313.310 Decl. -17.516 (ibex-sun) 

error is R.A. +0.497 Decl. +4.735 

for a total 4.760 deg 

ibex_rotate -o -u 0.662769,-0.7154,-0.221225 -w ibex-sun -t 2015/02:04:08:39:08 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.662769,-0.715400,-0.221225 

which is R.A. +312.813 Decl. -12.781 

missing R.A. +317.473 Decl. -16.367 (ibex-sun) 

error is R.A. +4.660 Decl. +3.586 

for a total 5.762 deg 

The sun precession 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 -r +317.548 -d -16.345 -w ibex-sun -t 2015/02:04:10:27:16 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.708023,-0.647693,-0.281420 

which is R.A. +317.548 Decl. -16.345 

missing R.A. +317.548 Decl. -16.345 (ibex-sun) 

error is R.A. +0.000 Decl. +0.000 

for a total 0.000 deg 

ibex_rotate -o -r +317.548 -d -16.345 -w ibex-sun -t 2015/02:04:11:57:22 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.708023,-0.647693,-0.281420 

which is R.A. +317.548 Decl. -16.345 

missing R.A. +317.609 Decl. -16.326 (ibex-sun) 

error is R.A. +0.061 Decl. +0.019 

for a total 0.062 deg 

ibex_rotate -o -r +317.548 -d -16.345 -w ibex-sun -t 2015/02:08:14:50:26 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.708023,-0.647693,-0.281420 

which is R.A. +317.548 Decl. -16.345 

missing R.A. +321.684 Decl. -15.033 (ibex-sun) 

error is R.A. +4.136 Decl. +1.312 

for a total 4.193 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 276 apogee: 

ibex_rotate -o -u 0.776423,-0.605801,-0.1737 -w ibex-sun -t 2015/02:08:17:02:37 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.776423,-0.605801,-0.173700 

which is R.A. +322.037 Decl. -10.003 

missing R.A. +321.780 Decl. -15.002 (ibex-sun) 

error is R.A. +0.257 Decl. +4.999 

for a total 5.005 deg 

ibex_rotate -o -u 0.776423,-0.605801,-0.1737 -w ibex-sun -t 2015-02-13T16:44:38.025Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.776423,-0.605801,-0.173700 

which is R.A. +322.037 Decl. -10.003 

missing R.A. +326.778 Decl. -13.395 (ibex-sun) 

error is R.A. +4.741 Decl. +3.392 

for a total 5.750 deg 

No Lo O-mode. 

There is no overlap with orbit 274 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: Monday, January 19, 2015 10:59:20 AM 
Subject: IBEX Orbit# 275 ATS (30 Jan 15 - 9 Feb 15) 

Guys, 
Here are the planning files for Orbit# 275. Please respond to this email thread with your comments and approvals. 
Approvals are required before 21 Jan 15 @ 0000 UTC 
Note the following: 
1. Battery Balancing at PERIGEE 
2015-02-09T02:41:17.055Z,Perigee,orbit:275 
ECT_SetLongEclipseFlag TRUE $TIME=2015/02:09:02:00:00 
ECT_SetLongEclipseFlag FALSE $TIME=2015/02:09:03:30:00 
2. Apogee Sun Maneuver 

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

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