[Isocops] IBEX Orbit# 268 ATS (27 Nov 14 - 6 Dec 14) - v001 approval

Sun Nov 16 19:21:34 EST 2014

All, 

I have looked at the orbit 268 ATS, 

IBEX_2014_331_o0268a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_331_o0268a_v001.ccvr. 

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

IBEX_2014_331_o0268a_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_331_o0268a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts about 3 hours after 15 Re ascending and ends about 21 1/2 hours later. The second starts about 13 hours before apogee and ends about 10 hours after perigee. 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 2 1/2 hours after that in the OEF and the ATS end time is about 2 hours after 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_Orbit268Contacts.txt, 

for the non-APL contacts (3). The APL contact commands will be in a separate ATS. 

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 267 left us pointing in safe directions for the orbit 268 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.470294,-0.805716,-0.360062 -w ibex-sun -t 2014/11:27:12:11:16 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.470294,-0.805716,-0.360062 

which is R.A. +239.728 Decl. -21.104 

missing R.A. +243.043 Decl. -21.132 (ibex-sun) 

error is R.A. +3.315 Decl. +0.028 

for a total 3.092 deg 

ibex_rotate -o -u -0.470294,-0.805716,-0.360062 -w ibex-sun -t 2014/12:01:12:32:48 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.470294,-0.805716,-0.360062 

which is R.A. +239.728 Decl. -21.104 

missing R.A. +247.217 Decl. -21.820 (ibex-sun) 

error is R.A. +7.489 Decl. +0.716 

for a total 7.005 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 +247.297 -d -21.831 -w ibex-sun -t 2014/12:01:14:20:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.358276,-0.856359,-0.371870 

which is R.A. +247.297 Decl. -21.831 

missing R.A. +247.297 Decl. -21.831 (ibex-sun) 

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

for a total 0.000 deg 

ibex_rotate -o -r +247.297 -d -21.831 -w ibex-sun -t 2014/12:01:15:51:02 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.358276,-0.856359,-0.371870 

which is R.A. +247.297 Decl. -21.831 

missing R.A. +247.364 Decl. -21.841 (ibex-sun) 

error is R.A. +0.067 Decl. +0.010 

for a total 0.063 deg 

ibex_rotate -o -r +247.297 -d -21.831 -w ibex-sun -t 2014/12:05:16:05:59 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.358276,-0.856359,-0.371870 

which is R.A. +247.297 Decl. -21.831 

missing R.A. +251.806 Decl. -22.374 (ibex-sun) 

error is R.A. +4.509 Decl. +0.543 

for a total 4.213 deg 

The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 269 apogee: 

ibex_rotate -o -r +251.925 -d -22.387 -w ibex-sun -t 2014/12:05:18:31:12 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.286878,-0.879003,-0.380861 

which is R.A. +251.925 Decl. -22.387 

missing R.A. +251.925 Decl. -22.387 (ibex-sun) 

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

for a total 0.000 deg 

ibex_rotate -o -r +251.925 -d -22.387 -w ibex-sun -t 2014-12-10T20:21:05.217Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI -0.286878,-0.879003,-0.380861 

which is R.A. +251.925 Decl. -22.387 

missing R.A. +257.385 Decl. -22.965 (ibex-sun) 

error is R.A. +5.460 Decl. +0.578 

for a total 5.071 deg 

No Lo O-mode. 

There is no overlap with orbit 267 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: Friday, November 14, 2014 10:03:40 AM 
Subject: IBEX Orbit# 268 ATS (27 Nov 14 - 6 Dec 14) 

Guys, 
Here are the planning files and ATS for Orbit# 268 
Please respond to this email thread with questions and approvals 
Approvals are required before 17 Nov 14 @1000 UTC 
Note the following: 
1. Apogee and Perigee Sun MAneuvers 
2014-12-01T00:59:42.432Z,StarTrackerOutageStart,dueTo:moon,orbit:268 
2014-12-06T13:35:00.000Z,StarTrackerOutageStop,dueTo:moon,orbit:268 
2. SSR_Dump/Tracking Contact command will be seperate once times are confirmed by APL-18 
3. Battery Balancing at Perigee 
SetLongEclipseFlag TRUE $TIME=2014/12:06:02:00:00 
SetLongEclipseFlag FALSE $TIME=2014/12:06:03:30:00 
4. Command Load Constraint Violation Report 
IBEX_2014_331_o0268a_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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