[Isocops] IBEX Orbit# 266 ATS (8 Nov 14 - 17 Nov 14) - v001 approval

Tue Oct 28 20:18:38 EDT 2014

All, 

I have looked at the orbit 266 ATS, 

IBEX_2014_312_o0266a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_312_o0266a_v001.ccvr. 

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

IBEX_2014_312_o0266a_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_312_o0266a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. The outage starts 9+ hours before the orbit 265 perigee and ends about 15 hours after 15 Re ascending. 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 about 2 hours after that in the OEF and the ATS end time is about 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_Orbit266Contacts.txt, 

for all contacts (2). 

We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands. 

The sun precession maneuver at perigee of orbit 265 left us pointing in safe directions for the orbit 266 arc A ascending and descending sequences: 

ibex_rotate -o -r +223.173 -d -16.510 -w ibex-sun -t 2014/11:09:04:36:07 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.699223,-0.655994,-0.284183 

which is R.A. +223.173 Decl. -16.510 

missing R.A. +224.037 Decl. -16.775 (ibex-sun) 

error is R.A. +0.864 Decl. +0.265 

for a total 0.869 deg 

ibex_rotate -o -r +223.173 -d -16.510 -w ibex-sun -t 2014/11:12:20:24:32 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.699223,-0.655994,-0.284183 

which is R.A. +223.173 Decl. -16.510 

missing R.A. +227.606 Decl. -17.789 (ibex-sun) 

error is R.A. +4.433 Decl. +1.279 

for a total 4.425 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 -0.666826,-0.679634,-0.305679 -w ibex-sun -t 2014/11:12:22:07:40 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.666826,-0.679634,-0.305679 

which is R.A. +225.545 Decl. -17.799 

missing R.A. +227.678 Decl. -17.808 (ibex-sun) 

error is R.A. +2.133 Decl. +0.009 

for a total 2.031 deg 

ibex_rotate -o -u -0.666826,-0.679634,-0.305679 -w ibex-sun -t 2014/11:12:23:42:46 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.666826,-0.679634,-0.305679 

which is R.A. +225.545 Decl. -17.799 

missing R.A. +227.745 Decl. -17.826 (ibex-sun) 

error is R.A. +2.200 Decl. +0.027 

for a total 2.095 deg 

ibex_rotate -o -u -0.666826,-0.679634,-0.305679 -w ibex-sun -t 2014/11:17:11:01:30 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.666826,-0.679634,-0.305679 

which is R.A. +225.545 Decl. -17.799 

missing R.A. +232.454 Decl. -18.958 (ibex-sun) 

error is R.A. +6.909 Decl. +1.159 

for a total 6.658 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 267 apogee: 

ibex_rotate -o -u -0.604779,-0.726703,-0.325799 -w ibex-sun -t 2014/11:17:13:22:28 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.604779,-0.726703,-0.325799 

which is R.A. +230.232 Decl. -19.014 

missing R.A. +232.563 Decl. -18.983 (ibex-sun) 

error is R.A. +2.331 Decl. +0.031 

for a total 2.204 deg 

ibex_rotate -o -u -0.604779,-0.726703,-0.325799 -w ibex-sun -t 2014-11-22T11:44:49.625Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.604779,-0.726703,-0.325799 

which is R.A. +230.232 Decl. -19.014 

missing R.A. +237.583 Decl. -20.134 (ibex-sun) 

error is R.A. +7.351 Decl. +1.120 

for a total 7.016 deg 

No Lo O-mode. 

There is no overlap with orbit 265 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: "Kucharek, Harald" <Harald.Kucharek at unh.edu>, "IBEX FDG" <ibex at applieddefense.com>, "OPS, ISOC" <isocops at lists.sr.unh.edu>, "Fairchild, Ken" <fair-play at comcast.net>, "Quinn, Marty" <marty.quinn at unh.edu>, "Reno, Chelle" <mreno at swri.edu>, "Angold, Nigel" <ngangold at earthlink.net>, "Paul Janzen" <paul.janzen at umontana.edu>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Tyler, Ryan" <tyler.ryan at orbital.com>, "Wesley, Sheral" <wesley.sheral at orbital.com>, "Perry, Tim" <perry.tim at orbital.com> 
Sent: Monday, October 27, 2014 8:22:48 PM 
Subject: IBEX Orbit# 266 ATS (8 Nov 14 - 17 Nov 14) 

Guys, 
Here are the planning files and ATS for Orbit# 266. 
Please respond to this email thread with questions, comments and approvals. 
Approvals are required before 29 Oct 14 @0100 UTC 
Please note the following: 
1. Battery Balancing during PERIGEE 
SetLongEclipseFlag TRUE $TIME=2014/11:17:21:00:00 
SetLongEclipseFlag FALSE $TIME=2014/11:17:22:30:00 
2. Moon in Lo FOV 
2014-11-13T09:37:18.347Z,MoonInLoFovStart,orbit:266 
2014-11-14T17:49:10.064Z,MoonInLoFovStop,orbit:266 
3. OEF GEneration: 
Because of the Sun Maneuver during PERIGEE of Orbit# 265, the OEF was generated using Orbit# 264 
4. Command Load Constraint Violation Report 
IBEX_2014_312_o0266a_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 
CYGNUS Mission Planning 
(304) 279-6678 

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