[Isocops] IBEX Orbit# 285 ATS (1 May 15 - 10 May 15) - v001 approval

Sat Apr 18 11:56:34 EDT 2015

All, 

I have looked at the orbit 285 ATS, 

IBEX_2015_121_o0285a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2015_121_o0285a_v001.ccvr. 

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

IBEX_2015_121_o0285a_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_121_o0285a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts 1 1/4 hours after apogee and runs for 2+ days. The second starts 1+ days after the first outage ends and ends about 12 hours later. Some despinning may be required due to these outages. 

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_Orbit285Contacts.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 284 left us pointing in safe directions for the orbit 285 arc A ascending and descending sequences: 

ibex_rotate -o -r +37.916 -d +14.930 -w ibex-sun -t 2015/05:02:02:56:33 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.762280,+0.593761,+0.257639 

which is R.A. +37.916 Decl. +14.930 

missing R.A. +38.763 Decl. +15.177 (ibex-sun) 

error is R.A. +0.847 Decl. +0.247 

for a total 0.854 deg 

ibex_rotate -o -r +37.916 -d +14.930 -w ibex-sun -t 2015/05:05:14:32:58 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.762280,+0.593761,+0.257639 

which is R.A. +37.916 Decl. +14.930 

missing R.A. +42.227 Decl. +16.208 (ibex-sun) 

error is R.A. +4.311 Decl. +1.278 

for a total 4.345 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 0.73395,0.627141,0.260791 -w ibex-sun -t 2015/05:05:16:16:06 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.733950,+0.627141,+0.260791 

which is R.A. +40.513 Decl. +15.117 

missing R.A. +42.297 Decl. +16.229 (ibex-sun) 

error is R.A. +1.784 Decl. +1.112 

for a total 2.046 deg 

ibex_rotate -o -u 0.73395,0.627141,0.260791 -w ibex-sun -t 2015/05:05:17:51:12 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.733950,+0.627141,+0.260791 

which is R.A. +40.513 Decl. +15.117 

missing R.A. +42.361 Decl. +16.248 (ibex-sun) 

error is R.A. +1.848 Decl. +1.131 

for a total 2.108 deg 

ibex_rotate -o -u 0.73395,0.627141,0.260791 -w ibex-sun -t 2015/05:10:00:40:53 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.733950,+0.627141,+0.260791 

which is R.A. +40.513 Decl. +15.117 

missing R.A. +46.400 Decl. +17.441 (ibex-sun) 

error is R.A. +5.887 Decl. +2.324 

for a total 6.110 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 286 apogee: 

ibex_rotate -o -u 0.680615,0.676045,0.282358 -w ibex-sun -t 2015/05:10:05:38:26 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.680615,+0.676045,+0.282358 

which is R.A. +44.807 Decl. +16.401 

missing R.A. +46.587 Decl. +17.492 (ibex-sun) 

error is R.A. +1.780 Decl. +1.091 

for a total 2.022 deg 

ibex_rotate -o -u 0.680615,0.676045,0.282358 -w ibex-sun -t 2015-05-14T23:04:16.095Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.680615,+0.676045,+0.282358 

which is R.A. +44.807 Decl. +16.401 

missing R.A. +51.349 Decl. +18.671 (ibex-sun) 

error is R.A. +6.542 Decl. +2.270 

for a total 6.637 deg 

No Lo O-mode. 

There is no overlap with orbit 284 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: "David Heirtzler" <dheirtzl at atlas.sr.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: Friday, April 17, 2015 11:12:14 AM 
Subject: IBEX Orbit# 285 ATS (1 May 15 - 10 May 15) 

Guys, 
Here are the planning files and ATS for Orbit# 285. Please respond to this email thread with your approvals and comments. 
All approvals are required before 21 Apr 15 @1200 UTC 
Note the following: 
1. Battery Balancing at Perigee 
Orbit# 285 PERIGEE: Battery Balancing Commands 
SetLongEclipseFlag TRUE $TIME=2015/05:10:12:00:00 
SetLongEclipseFlag FALSE $TIME=2015/05:10:13:30:00 
2. Command Load Constraint Violation Report 
IBEX_2015_121_o0285a_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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