[Isocops] IBEX Orbit# 313 ATS Approval (11 Jan 16 - 20 Jan 16) - v001 approval

Thu Dec 31 09:12:46 EST 2015

All, 

I have looked at the orbit 313 ATS, 

IBEX_2016_011_o0313a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2016_011_o0313a_v001.ccvr. 

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

IBEX_2016_011_o0313a_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_011_o0313a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts 2+ days before apogee and runs for almost 4 days. Some despinning may be required due to this outage. 

There is one moon in Lo FOV session in arc A. The ATS start time is almost 11 hours after that in the OEF and the ATS end time is almost 9 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_Orbit313_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 312 left us pointing in safe directions for the orbit 313 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.357338,-0.81404,-0.457874 -w ibex-sun -t 2016/01:11:18:18:33 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.357338,-0.814040,-0.457874 

which is R.A. +293.700 Decl. -27.250 

missing R.A. +292.465 Decl. -21.846 (ibex-sun) 

error is R.A. +1.235 Decl. +5.404 

for a total 5.520 deg 

ibex_rotate -o -u 0.357338,-0.81404,-0.457874 -w ibex-sun -t 2016/01:15:15:27:30 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.357338,-0.814040,-0.457874 

which is R.A. +293.700 Decl. -27.250 

missing R.A. +296.608 Decl. -21.220 (ibex-sun) 

error is R.A. +2.908 Decl. +6.030 

for a total 6.587 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 +296.687 -d -21.206 -w ibex-sun -t 2016/01:15:17:15:38 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.418705,-0.832973,-0.361722 

which is R.A. +296.687 Decl. -21.206 

missing R.A. +296.687 Decl. -21.206 (ibex-sun) 

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

for a total 0.000 deg 

ibex_rotate -o -r +296.687 -d -21.206 -w ibex-sun -t 2016/01:15:18:45:44 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.418705,-0.832973,-0.361722 

which is R.A. +296.687 Decl. -21.206 

missing R.A. +296.753 Decl. -21.194 (ibex-sun) 

error is R.A. +0.066 Decl. +0.012 

for a total 0.063 deg 

ibex_rotate -o -r +296.687 -d -21.206 -w ibex-sun -t 2016/01:19:15:42:00 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.418705,-0.832973,-0.361722 

which is R.A. +296.687 Decl. -21.206 

missing R.A. +300.861 Decl. -20.398 (ibex-sun) 

error is R.A. +4.174 Decl. +0.808 

for a total 3.985 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 314 apogee: 

ibex_rotate -o -u 0.499151,-0.751795,-0.430873 -w ibex-sun -t 2016/01:19:17:45:53 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.499151,-0.751795,-0.430873 

which is R.A. +303.582 Decl. -25.523 

missing R.A. +300.957 Decl. -20.379 (ibex-sun) 

error is R.A. +2.625 Decl. +5.144 

for a total 5.683 deg 

ibex_rotate -o -u 0.499151,-0.751795,-0.430873 -w ibex-sun -t 2016-01-24T16:26:00.310Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.499151,-0.751795,-0.430873 

which is R.A. +303.582 Decl. -25.523 

missing R.A. +306.221 Decl. -19.310 (ibex-sun) 

error is R.A. +2.639 Decl. +6.213 

for a total 6.674 deg 

Lo O-mode in arc B (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 312 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: Tuesday, December 29, 2015 6:54:55 PM 
Subject: IBEX Orbit# 313 ATS Approval (11 Jan 16 - 20 Jan 16) 

Guys, 

Here are the planning files and ATS for Orbit# 313 

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

Approvals are required before 1 Jan 16 @1200 UTC 

Note the following: 

1. Battery Balancing at PERIGEE 

2016-01-20T03:42:40.655Z,Perigee,orbit:313 

SetLongEclipseFlag TRUE $TIME=2016/01:20:03:00:00 

SetLongEclipseFlag FALSE $TIME=2016/01:20:04:30:00 

2. Moon in Lo FOV 

2016-01-13T02:51:05.608Z,MoonInLoFovStart,orbit:313 

2016-01-13T19:33:11.116Z,MoonInLoFovStop,orbit:313 

3. APOGEE Sun Maneuver 

2016-01-13T11:40:22.759Z,StarTrackerOutageStart,dueTo:earth,orbit:313 

2016-01-17T06:29:50.677Z,StarTrackerOutageStop,dueTo:earth,orbit:313 

4. O-MODE Start and Start Commands 

5. Command Load Constraint Violation Report 

IBEX_2016_011_o0313a_v001.scr 

========================== 

HARD CONSTRAINT VIOLATIONS 

========================== 

NO VIOLATIONS. 

========================== 

SOFT CONSTRAINT VIOLATIONS 

========================== 

NO VIOLATIONS. 

============== 

OTHER MESSAGES 

============== 

NO MESSAGES. 

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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