[Isocops] IBEX Orbit# 311 ATS Approval (24 Dec 15 - 2 Jan 16) - v001 approval

Ken Fairchild fair-play at comcast.net
Sun Dec 13 20:28:36 EST 2015


All, 

I have looked at the orbit 311 ATS, 



IBEX_2015_358_o0311a_v001.scr, 




and I approve. 




There are no constraint violations in 




IBEX_2015_358_o0311a_v001.ccvr. 




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




IBEX_2015_358_o0311a_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_358_o0311a_v001.oef, 




and as verified with ibex_orbit. 




There is one star tracker outage. It starts about 4 1/2 hours after 15 Re ascending and runs for almost 3 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 about 6 hours before that in the OEF and the end times in the ATS and OEF are the same. Differences in timing are not unusual. 




The ground station command sequences are correct and the timing and bit rates match those in the contacts file, 




IBEX_Orbit311_Contacts.txt, 




for all contacts (3). 




No battery cell balancing this orbit; we'll do it again next orbit. 




The inertial maneuver at perigee of orbit 310 left us pointing in safe directions for the orbit 311 arc A ascending and descending sequences: 




ibex_rotate -o -u 0.052071,-0.912217,-0.406386 -w ibex-sun -t 2015/12:24:17:05:39 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.052071,-0.912217,-0.406386 

which is R.A. +273.267 Decl. -23.978 

missing R.A. +272.590 Decl. -23.428 (ibex-sun) 

error is R.A. +0.677 Decl. +0.550 

for a total 0.828 deg 




ibex_rotate -o -u 0.052071,-0.912217,-0.406386 -w ibex-sun -t 2015/12:28:10:11:10 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.052071,-0.912217,-0.406386 

which is R.A. +273.267 Decl. -23.978 

missing R.A. +276.624 Decl. -23.333 (ibex-sun) 

error is R.A. +3.357 Decl. +0.645 

for a total 3.142 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 0.166095,-0.900907,-0.400973 -w ibex-sun -t 2015/12:28:11:53:45 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.166095,-0.900907,-0.400973 

which is R.A. +280.446 Decl. -23.639 

missing R.A. +276.701 Decl. -23.329 (ibex-sun) 

error is R.A. +3.745 Decl. +0.310 

for a total 3.448 deg 




ibex_rotate -o -u 0.166095,-0.900907,-0.400973 -w ibex-sun -t 2015/12:28:13:29:24 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.166095,-0.900907,-0.400973 

which is R.A. +280.446 Decl. -23.639 

missing R.A. +276.773 Decl. -23.326 (ibex-sun) 

error is R.A. +3.673 Decl. +0.313 

for a total 3.383 deg 




ibex_rotate -o -u 0.166095,-0.900907,-0.400973 -w ibex-sun -t 2016/01:01:19:40:12 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.166095,-0.900907,-0.400973 

which is R.A. +280.446 Decl. -23.639 

missing R.A. +281.489 Decl. -23.003 (ibex-sun) 

error is R.A. +1.043 Decl. +0.636 

for a total 1.150 deg 




The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 312 apogee: 




ibex_rotate -o -u 0.212444,-0.892507,-0.397869 -w ibex-sun -t 2016/01:01:21:48:30 

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. +281.594 Decl. -22.995 (ibex-sun) 

error is R.A. +1.795 Decl. +0.450 

for a total 1.710 deg 




ibex_rotate -o -u 0.212444,-0.892507,-0.397869 -w ibex-sun -t 2016-01-06T19:20:13.313Z 

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. +286.985 Decl. -22.552 (ibex-sun) 

error is R.A. +3.596 Decl. +0.893 

for a total 3.429 deg 




No Lo O-mode. 




There is no overlap with orbit 310 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: "Wesley.Sheral" <sheral.wesley 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: Friday, December 11, 2015 2:13:13 AM 
Subject: IBEX Orbit# 311 ATS Approval (24 Dec 15 - 2 Jan 16) 



Guys, 

Here are the planning files and ATS for Orbit# 311. Please respond to this email thread with your 

questions, comments and approvals. 

Approvals are required before 14 Dec 15 @1800 UTC. 



Note the following: 

1. No Battery balancing this orbit 

2. Moon in Lo FOV 

Orbit# 311 APOGEE: Moon in Lo FOV Commands 

# 2016-01-01T09:56:53.741Z,MoonInLoFovStart,orbit:311 

# 2016-01-01T18:19:12.549Z,MoonInLoFovStop,orbit:311 



Sheral R. Wesley 

SPVR., Satellite Operations 

IBEX Mission OPS 

CRS/CYGNUS Mission Planning 

Bldg. 2 Room 1337 

Office (703) 406-5641 

Cell (202) 236-0802 







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