[Isocops] IBEX Orbit #317 ATS Appoval (Feb 16 - 25) - v001 approval

Fri Feb 5 20:48:55 EST 2016

All, 

I have looked at the orbit 317 ATS, 

IBEX_2016_047_o0317a_v001.scr, 

and I approve. 

The only constraint violation in 

IBEX_2016_047_o0317a_v001.ccvr 

is related to the eclipse and is expected. 

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

IBEX_2016_047_o0317a_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_047_o0317a_v001.oef, 

and as verified with ibex_orbit. 

There is one star tracker outage. It starts 7 hours after 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 A. The ATS and OEF start times are the same and the ATS end time is 2 hours before that in the OEF. This difference is not unusual. 

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

IBEX_Orbit317_Contacts.txt, 

for all contacts (3). 

There is an eclipse near perigee and the LE flag set and unset commands follow Ryan's recommendations and are offset by enough time from other commands. 

The inertial maneuver at perigee of orbit 316 left us pointing in safe directions for the orbit 317 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.838386,-0.453919,-0.301771 -w ibex-sun -t 2016/02:16:13:15:35 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.838386,-0.453919,-0.301771 

which is R.A. +331.568 Decl. -17.564 

missing R.A. +329.321 Decl. -12.488 (ibex-sun) 

error is R.A. +2.247 Decl. +5.076 

for a total 5.520 deg 

ibex_rotate -o -u 0.838386,-0.453919,-0.301771 -w ibex-sun -t 2016/02:20:02:37:06 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.838386,-0.453919,-0.301771 

which is R.A. +331.568 Decl. -17.564 

missing R.A. +332.793 Decl. -11.248 (ibex-sun) 

error is R.A. +1.225 Decl. +6.316 

for a total 6.426 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 0.851682,-0.477004,-0.217036 -w ibex-sun -t 2016/02:20:04:20:14 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.851682,-0.477004,-0.217036 

which is R.A. +330.748 Decl. -12.535 

missing R.A. +332.861 Decl. -11.223 (ibex-sun) 

error is R.A. +2.113 Decl. +1.312 

for a total 2.449 deg 

ibex_rotate -o -u 0.851682,-0.477004,-0.217036 -w ibex-sun -t 2016/02:20:05:55:20 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.851682,-0.477004,-0.217036 

which is R.A. +330.748 Decl. -12.535 

missing R.A. +332.923 Decl. -11.199 (ibex-sun) 

error is R.A. +2.175 Decl. +1.336 

for a total 2.513 deg 

ibex_rotate -o -u 0.851682,-0.477004,-0.217036 -w ibex-sun -t 2016/02:24:15:56:00 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.851682,-0.477004,-0.217036 

which is R.A. +330.748 Decl. -12.535 

missing R.A. +337.040 Decl. -9.582 (ibex-sun) 

error is R.A. +6.292 Decl. +2.953 

for a total 6.844 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 318 apogee: 

ibex_rotate -o -u 0.91981,-0.355866,-0.165254 -w ibex-sun -t 2016/02:24:17:59:13 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.919810,-0.355866,-0.165254 

which is R.A. +338.849 Decl. -9.512 

missing R.A. +337.122 Decl. -9.550 (ibex-sun) 

error is R.A. +1.727 Decl. +0.038 

for a total 1.704 deg 

ibex_rotate -o -u 0.91981,-0.355866,-0.165254 -w ibex-sun -t 2016-02-29T14:58:17.025Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.919810,-0.355866,-0.165254 

which is R.A. +338.849 Decl. -9.512 

missing R.A. +341.827 Decl. -7.732 (ibex-sun) 

error is R.A. +2.978 Decl. +1.780 

for a total 3.441 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 316 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: "Perry.Tim" <tim.perry 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>, "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: Wednesday, February 3, 2016 11:31:49 AM 
Subject: IBEX Orbit #317 ATS Appoval (Feb 16 - 25) 

All, 

Attached are the planning files and ATS for Orbit# 317. Please respond to this email thread with your questions, comments and approvals. 

All approvals are required before COB 6 Feb 2016. 

Note the following: 

1. Moderate Eclipse 

Min voltage expected is 3.58V 

2016-02-25T06:57:14.061Z,EclipseEntry,moderate:true,long:false,orbit:317 

2016-02-25T08:13:52.867Z,EclipseExit,moderate:true,long:false,orbit:317 

2. Arc-A O-MODE Commands 

3. Moon in Lo FOV Commands 

4. APL-18 SSR_Dump/Tracking Contact – Feb 24/20:00:00 – 21:00:00z 

5. Command Load Constraint Violation Report 

IBEX_2016_047_o0317a_v001.scr 

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

HARD CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 

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

SOFT CONSTRAINT VIOLATIONS 

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

IBX-CLC-015: Battery charge falls below minimum from 2016/02/25 07:51:14 UTC - 

2016/02/25 09:05:52 UTC. Lowest charge level is 6515.803943 

watt-minutes during this interval. 

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

OTHER MESSAGES 

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

NO MESSAGES. 

Timothy E.Perry 

CRS, IBEX & OCO-2 

Mission Operations 

tim.perry at orbitalatk.com 

Office (703) 406-5976 

Cell (301) 606-1430 

Corp Cell (571)-447-8977 

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