[Isocops] IBEX Orbit# 312 ATS Approval (2 - 11 Jan 16) - v002 approval

Wed Dec 23 09:11:29 EST 2015

All, 

I have looked at the orbit 312 ATS, 

IBEX_2016_002_o0312a_v002.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2016_002_o0312a_v001.ccvr. 

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

IBEX_2016_002_o0312a_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_2016_002_o0312a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts 2+ days before apogee and runs for 2+ days. Some despinning may be required due to this outage. 

There are two moon in Lo FOV sessions in arc A (only one in the OEF). The ATS start time of the first session is the same as the start time in the OEF and the ATS end time of the second session is 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_Orbit312_Contacts.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 311 left us pointing in safe directions for the orbit 312 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.212444,-0.892507,-0.397869 -w ibex-sun -t 2016/01:02:19:34:03 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.212444,-0.892507,-0.397869 

which is R.A. +283.389 Decl. -23.445 

missing R.A. +282.668 Decl. -22.939 (ibex-sun) 

error is R.A. +0.721 Decl. +0.506 

for a total 0.833 deg 

ibex_rotate -o -u 0.212444,-0.892507,-0.397869 -w ibex-sun -t 2016/01:07:15:30:01 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.212444,-0.892507,-0.397869 

which is R.A. +283.389 Decl. -23.445 

missing R.A. +287.889 Decl. -22.444 (ibex-sun) 

error is R.A. +4.500 Decl. +1.001 

for a total 4.263 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 0.321914,-0.864816,-0.38531 -w ibex-sun -t 2016/01:07:17:13:09 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.321914,-0.864816,-0.385310 

which is R.A. +290.417 Decl. -22.663 

missing R.A. +287.966 Decl. -22.434 (ibex-sun) 

error is R.A. +2.451 Decl. +0.229 

for a total 2.275 deg 

ibex_rotate -o -u 0.321914,-0.864816,-0.38531 -w ibex-sun -t 2016/01:07:18:48:15 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.321914,-0.864816,-0.385310 

which is R.A. +290.417 Decl. -22.663 

missing R.A. +288.037 Decl. -22.425 (ibex-sun) 

error is R.A. +2.380 Decl. +0.238 

for a total 2.211 deg 

ibex_rotate -o -u 0.321914,-0.864816,-0.38531 -w ibex-sun -t 2016/01:10:18:19:28 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.321914,-0.864816,-0.385310 

which is R.A. +290.417 Decl. -22.663 

missing R.A. +291.295 Decl. -21.980 (ibex-sun) 

error is R.A. +0.878 Decl. +0.683 

for a total 1.061 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 313 apogee: 

ibex_rotate -o -u 0.357338,-0.81404,-0.457874 -w ibex-sun -t 2016/01:10:20:23:51 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.357338,-0.814040,-0.457874 

which is R.A. +293.700 Decl. -27.250 

missing R.A. +291.395 Decl. -21.967 (ibex-sun) 

error is R.A. +2.305 Decl. +5.283 

for a total 5.683 deg 

ibex_rotate -o -u 0.357338,-0.81404,-0.457874 -w ibex-sun -t 2016-01-15T17:00:52.747Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.357338,-0.814040,-0.457874 

which is R.A. +293.700 Decl. -27.250 

missing R.A. +296.677 Decl. -21.208 (ibex-sun) 

error is R.A. +2.977 Decl. +6.042 

for a total 6.623 deg 

No Lo O-mode. 

There is no overlap with orbit 311 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: "Perry.Tim" <tim.perry at orbitalatk.com> 
To: "David Heirtzler" <dheirtzl at atlas.sr.unh.edu>, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS" <IBEXOPS at gmail.com>, "ISOC" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Lockwood.Robert" <robert.lockwood at orbitalatk.com>, "Marty Quinn" <marty.quinn at unh.edu>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <nigel.angold at nasa.gov>, "Paul Janzen" <paul.janzen at umontana.edu>, "Perry.Tim" <tim.perry at orbitalatk.com>, "Tyler.Ryan" <ryan.tyler at orbitalatk.com>, "Wesley.Sheral" <sheral.wesley at orbitalatk.com> 
Sent: Monday, December 21, 2015 12:15:31 PM 
Subject: IBEX Orbit# 312 ATS Approval (2 - 11 Jan 16) 

All, 

Here are the planning files and ATS for Orbit# 312. Please respond to this email thread with your 

questions, comments and approvals. 

Approvals are required before 23 Dec 15 @1800 UTC. 

Note the following: 

1. # Orbit# 312 PERIGEE: Battery Balancing 

# 2016-01-11T06:20:21.437Z,Perigee,orbit:312 

@ECT_SetLongEclipseFlag TRUE $TIME=2016/01:11:06:00:00 

@ECT_SetLongEclipseFlag FALSE $TIME=2016/01:11:07:30:00 Battery Balancing 

2. Moon In FOV 

# 2016-01-02T20:58:11.992Z,MoonInLoFovStart,orbit:312 

# 2016-01-06T20:03:06.012Z,MoonInLoFovStop,orbit:312 

Timothy E.Perry 

CRS, IBEX & OCO-2 

Mission Operations 

tim.perry at orbitalatk.com 

Office (703) 406-5976 

Cell (301) 606-1430 

Corp Cell (571)-447-8977 

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