[Isocops] IBEX Orbit# 279 ATS (8 Mar 15 - 17 Mar 15) - v001 approval

Wed Feb 25 11:12:13 EST 2015

All, 

I have looked at the orbit 279 ATS, 

IBEX_2015_067_o0279a_v001.scr, 

and I approve. 

The constraint violation in 

IBEX_2015_067_o0279a_v001.ccvr 

is related to the eclipse and isn't a problem. 

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

IBEX_2015_067_o0279a_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_067_o0279a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts 1+ days after apogee and runs for 2+ days. 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 almost two hours before that in the OEF and the ATS end time is 4 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_Orbit279Contacts.txt, 

for all contacts (2). 

The LE flag is set because of the eclipse. The command start and end times match Ryan's recommendations. 

The inertial maneuver at perigee of orbit 278 left us pointing in safe directions for the orbit 279 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.977862,-0.209243,-0.001815 -w ibex-sun -t 2015/03:09:02:29:36 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.977862,-0.209243,-0.001815 

which is R.A. +347.922 Decl. -0.104 

missing R.A. +348.978 Decl. -4.748 (ibex-sun) 

error is R.A. +1.056 Decl. +4.644 

for a total 4.762 deg 

ibex_rotate -o -u 0.977862,-0.209243,-0.001815 -w ibex-sun -t 2015/03:12:15:40:48 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.977862,-0.209243,-0.001815 

which is R.A. +347.922 Decl. -0.104 

missing R.A. +352.304 Decl. -3.360 (ibex-sun) 

error is R.A. +4.382 Decl. +3.256 

for a total 5.457 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 0.988975,-0.145863,0.025531 -w ibex-sun -t 2015/03:12:17:23:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.988975,-0.145863,+0.025531 

which is R.A. +351.610 Decl. +1.463 

missing R.A. +352.369 Decl. -3.331 (ibex-sun) 

error is R.A. +0.759 Decl. +4.794 

for a total 4.854 deg 

ibex_rotate -o -u 0.988975,-0.145863,0.025531 -w ibex-sun -t 2015/03:12:18:59:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.988975,-0.145863,+0.025531 

which is R.A. +351.610 Decl. +1.463 

missing R.A. +352.429 Decl. -3.306 (ibex-sun) 

error is R.A. +0.819 Decl. +4.768 

for a total 4.838 deg 

ibex_rotate -o -u 0.988975,-0.145863,0.025531 -w ibex-sun -t 2015/03:17:04:00:08 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.988975,-0.145863,+0.025531 

which is R.A. +351.610 Decl. +1.463 

missing R.A. +356.326 Decl. -1.579 (ibex-sun) 

error is R.A. +4.716 Decl. +3.042 

for a total 5.611 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 280 apogee: 

ibex_rotate -o -u 0.998022,-0.056287,-0.027991 -w ibex-sun -t 2015/03:17:06:14:36 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998022,-0.056287,-0.027991 

which is R.A. +356.772 Decl. -1.604 

missing R.A. +356.410 Decl. -1.542 (ibex-sun) 

error is R.A. +0.362 Decl. +0.062 

for a total 0.367 deg 

ibex_rotate -o -u 0.998022,-0.056287,-0.027991 -w ibex-sun -t 2015-03-22T03:20:50.596Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.998022,-0.056287,-0.027991 

which is R.A. +356.772 Decl. -1.604 

missing R.A. +0.985 Decl. +0.392 (ibex-sun) 

error is R.A. +355.787 Decl. +1.996 

for a total 4.661 deg 

No Lo O-mode. 

There is no overlap with orbit 278 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" <robert.lockwood at orbitalatk.com>, "Ryan Tyler" <ryan.tyler at orbitalatk.com>, "Sheral Wesley" <sheral.wesley at orbitalatk.com>, "Tim Perry" <tim.perry at orbitalatk.com> 
Sent: Monday, February 23, 2015 1:24:22 PM 
Subject: IBEX Orbit# 279 ATS (8 Mar 15 - 17 Mar 15) 

Guys, 
Here are the planning files and ATS for Orbit# 279. 
Please respond to this thread with your comments and approvals. 
Approvals are required before 26 Feb 15 @1400 UTC 
Note the following: 
1. Orbit# 279 PERIGEE: Moderate Eclipse Commands 
# 2015-03-17T20:35:32.930Z,PenumbraEntry,orbit:279 
# 2015-03-17T20:35:32.930Z,EclipseEntry,moderate:true,long:false,orbit:279 
ECT_SetLongEclipseFlag TRUE $TIME=2015/03:17:18:40:00 
ECT_SetLongEclipseFlag FALSE $TIME=2015/03:17:22:00:00 

# 2015-03-17T21:58:32.103Z,PenumbraExit,orbit:279 
# 2015-03-17T21:58:32.103Z,EclipseExit,moderate:true,long:false,orbit:279 
2. Moon in Lo FOV 
# 2015-03-15T19:15:02.825Z,MoonInLoFovStart,orbit:279 
# 2015-03-16T09:16:48.148Z,MoonInLoFovStop,orbit:279 
3. Command Load Constraint Violation Report 
IBEX_2015_067_o0279a_v001.scr 
========================== 
HARD CONSTRAINT VIOLATIONS 
========================== 
NO VIOLATIONS. 
========================== 
SOFT CONSTRAINT VIOLATIONS 
========================== 
IBX-CLC-015: Battery charge falls below minimum from 2015/03/17 21:29:32 UTC - 
2015/03/17 21:58:32 UTC. Lowest charge level is 6047.318588 
watt-minutes during this interval. 
* Will set the long eclipse flag during this moderate eclipse 
ECT_SetLongEclipseFlag TRUE $TIME=2015/03:17:18:40:00 
ECT_SetLongEclipseFlag FALSE $TIME=2015/03:17:22:00:00 
============== 
OTHER MESSAGES 
============== 
NO MESSAGES. 

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

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