[Isocops] IBEX Orbit# 314 ATS Approval (20 Jan 16 - 29 Jan 16) - v001 approval

Sun Jan 10 01:22:20 EST 2016

All, 

Note: Off-pointing at perigee descending is 4.060 deg. 

I have looked at the orbit 314 ATS, 

IBEX_2016_020_o0314a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2016_020_o0314a_v001.ccvr. 

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

IBEX_2016_020_o0314a_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_020_o0314a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts about 1 day after 15 Re ascending and runs for 3+ days. The second starts at apogee and runs for 2+ days. 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_Orbit314_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 313 left us pointing in safe directions for the orbit 314 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.499151,-0.751795,-0.430873 -w ibex-sun -t 2016/01:20:15:40:32 

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. +302.005 Decl. -20.199 (ibex-sun) 

error is R.A. +1.577 Decl. +5.324 

for a total 5.519 deg 

ibex_rotate -o -u 0.499151,-0.751795,-0.430873 -w ibex-sun -t 2016/01:24:14:52:02 

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. +306.154 Decl. -19.325 (ibex-sun) 

error is R.A. +2.572 Decl. +6.198 

for a total 6.637 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 +306.231 -d -19.307 -w ibex-sun -t 2016/01:24:16:40:10 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.557802,-0.761276,-0.330630 

which is R.A. +306.231 Decl. -19.307 

missing R.A. +306.231 Decl. -19.307 (ibex-sun) 

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

for a total 0.000 deg 

ibex_rotate -o -r +306.231 -d -19.307 -w ibex-sun -t 2016/01:24:18:10:16 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.557802,-0.761276,-0.330630 

which is R.A. +306.231 Decl. -19.307 

missing R.A. +306.295 Decl. -19.292 (ibex-sun) 

error is R.A. +0.064 Decl. +0.015 

for a total 0.062 deg 

ibex_rotate -o -r +306.231 -d -19.307 -w ibex-sun -t 2016/01:28:17:27:06 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.557802,-0.761276,-0.330630 

which is R.A. +306.231 Decl. -19.307 

missing R.A. +310.375 Decl. -18.261 (ibex-sun) 

error is R.A. +4.144 Decl. +1.046 

for a total 4.060 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 315 apogee: 

ibex_rotate -o -u 0.630752,-0.668145,-0.394632 -w ibex-sun -t 2016/01:28:19:31:55 

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. +310.468 Decl. -18.238 (ibex-sun) 

error is R.A. +2.883 Decl. +5.005 

for a total 5.685 deg 

ibex_rotate -o -u 0.630752,-0.668145,-0.394632 -w ibex-sun -t 2016-02-02T16:23:56.140Z 

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. +315.526 Decl. -16.927 (ibex-sun) 

error is R.A. +2.175 Decl. +6.316 

for a total 6.638 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 313 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: Thursday, January 7, 2016 2:21:51 PM 
Subject: IBEX Orbit# 314 ATS Approval (20 Jan 16 - 29 Jan 16) 

Guys, 

Here are the planning products and ATS for Orbit# 314. Please respond to this email thread with your comments, questions and approvals. 

Approvals are required before 10 Jan 16 @1200 UTC 

Note the following 

1. APOGEE Sun Maneuver 

2016-01-24T16:25:19.490Z,StarTrackerOutageStart,dueTo:overlap,orbit:314 

2016-01-27T00:33:08.777Z,StarTrackerOutageStop,dueTo:overlap,orbit:314 

2. O-MODE on/off 

ARC-A 

3. APL-18 SSR_Dump Contact 

IBEX,APL-18,ADD,01/29/16,029,00:00:00,01/29/16,029,01:00:00,,11re-Descending Perigee 2K-320K IBEX Orbit# 314 SSR_Dump/Tracking Contact (11 Desc) 

4. Command Load Constraint Violation Report 

IBEX_2016_020_o0314a_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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