[Isocops] IBEX Orbit# 315 ATS Approval (29 Jan 16 - 7 Feb 16) - v001 approval

Ken Fairchild fair-play at comcast.net
Sun Jan 17 07:18:01 EST 2016


All, 

Note: Off-pointing at perigee descending is 3.955 deg. 

I have looked at the orbit 315 ATS, 



IBEX_2016_029_o0315a_v001.scr, 




and I approve. 




There are no constraint violations in 




IBEX_2016_029_o0315a_v001.ccvr. 




The PL commands in the v001 ATS match those in the v003 STF, 




IBEX_2016_029_o0315a_v003.stf, 




except that the ATS has an SSR_DUMP_NEW command. This is expected as APL is being used for the dump pass. 




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_2016_029_o0315a_v001.oef, 




and as verified with ibex_orbit. 




There is one star tracker outage. It starts about 12 hours before apogee and runs for 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 2 hours before that in the OEF and the ATS end time is 5 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_Orbit315_Contacts.txt, 




for all contacts (3). 




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 314 left us pointing in safe directions for the orbit 315 arc A ascending and descending sequences: 




ibex_rotate -o -u 0.630752,-0.668145,-0.394632 -w ibex-sun -t 2016/01:29:17:27:29 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.630752,-0.668145,-0.394632 

which is R.A. +313.351 Decl. -23.243 

missing R.A. +311.488 Decl. -18.006 (ibex-sun) 

error is R.A. +1.863 Decl. +5.237 

for a total 5.520 deg 




ibex_rotate -o -u 0.630752,-0.668145,-0.394632 -w ibex-sun -t 2016/02:02:14:49:42 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.630752,-0.668145,-0.394632 

which is R.A. +313.351 Decl. -23.243 

missing R.A. +315.461 Decl. -16.946 (ibex-sun) 

error is R.A. +2.110 Decl. +6.297 

for a total 6.601 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 +315.536 -d -16.924 -w ibex-sun -t 2016/02:02:16:37:50 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.682782,-0.670125,-0.291103 

which is R.A. +315.536 Decl. -16.924 

missing R.A. +315.536 Decl. -16.924 (ibex-sun) 

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

for a total 0.000 deg 




ibex_rotate -o -r +315.536 -d -16.924 -w ibex-sun -t 2016/02:02:18:07:56 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.682782,-0.670125,-0.291103 

which is R.A. +315.536 Decl. -16.924 

missing R.A. +315.598 Decl. -16.906 (ibex-sun) 

error is R.A. +0.062 Decl. +0.018 

for a total 0.062 deg 




ibex_rotate -o -r +315.536 -d -16.924 -w ibex-sun -t 2016/02:06:15:28:33 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.682782,-0.670125,-0.291103 

which is R.A. +315.536 Decl. -16.924 

missing R.A. +319.462 Decl. -15.720 (ibex-sun) 

error is R.A. +3.926 Decl. +1.204 

for a total 3.955 deg 




The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 316 apogee: 




ibex_rotate -o -u 0.743979,-0.568362,-0.351368 -w ibex-sun -t 2016/02:06:17:28:12 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.743979,-0.568362,-0.351368 

which is R.A. +322.622 Decl. -20.571 

missing R.A. +319.547 Decl. -15.694 (ibex-sun) 

error is R.A. +3.075 Decl. +4.877 

for a total 5.685 deg 




ibex_rotate -o -u 0.743979,-0.568362,-0.351368 -w ibex-sun -t 2016-02-11T14:00:20.916Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.743979,-0.568362,-0.351368 

which is R.A. +322.622 Decl. -20.571 

missing R.A. +324.464 Decl. -14.175 (ibex-sun) 

error is R.A. +1.842 Decl. +6.396 

for a total 6.633 deg 




Lo O-mode in arc A (plan 6,7,1,1). O-mode timing matches that specified in the ISN season memo. There is more than 1 hour between the end of the ascending sequence and the start of O-mode and also more than an hour after O-mode ends and the start of the descending sequence. 




There is no overlap with orbit 314 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, January 15, 2016 4:10:41 PM 
Subject: IBEX Orbit# 315 ATS Approval (29 Jan 16 - 7 Feb 16) 



Guys, 

Here are the planning files and ATS for Orbit# 315. 

Please respond to this email thread with your questions, comments and approvals. 

Approvals are required before 19 Jan 16 @1100 UTC 



Note the following: 

1. Battery Balancing at PERIGEE 

2016-02-07T03:29:22.551Z,Perigee,orbit:315 

SetLongEclipseFlag TRUE $TIME=2016/02:07:03:00:00 

SetLongEclipseFlag FALSE $TIME=2016/02:07:04:30:00 



2. Moon in Lo FOV Commands 

2016-02-04T03:22:50.204Z,MoonInLoFovStart,orbit:315 

2016-02-04T23:41:22.759Z,MoonInLoFovStop,orbit:315 



3. APOGEE Sun Maneuver 

2016-02-02T04:10:24.863Z,StarTrackerOutageStart,dueTo:earth,orbit:315 

2016-02-05T12:07:54.079Z,StarTrackerOutageStop,dueTo:earth,orbit:315 



4. APOGEE Arc-A O-MODE Commands 



5. APL-18 SSR_Dump Contact 2-320k 







Sheral R. Wesley 

IBEX Mission OPS 

CRS/CYGNUS Mission Planning 

Bldg. 2 Room 1337 

Office (703) 406-5641 

Cell (202) 236-0802 







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