[Isocops] IBEX Orbit# 340 ATS Approval (12 Sept 16 - 21 Sept 12) - v001 approval

Thu Sep 1 09:40:55 EDT 2016

All, 

I have looked at the orbit 340 ATS, 

IBEX_2016_256_o0340a_v001.scr, 

and I approve. 

The only constraint violations in 

IBEX_2016_256_o0340a_v001.ccvr 

are because we removed the 

ACT_SetSpinPulseProtectEnable Enable 

commands (2); the violations are expected. 

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

IBEX_2016_256_o0340a_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_2016_256_o0340a_v001.oef, 

and as verified with ibex_orbit. 

There are two star tracker outages. The first starts about 10 hours after 15 Re ascending and runs for 28 hours. The second starts about 3 1/2 hours after perigee and runs for 7 hours. Some despinning may be required due to the first outage. 

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_Orbit340_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 339 left us pointing in safe directions for the orbit 340 arc A ascending and descending sequences: 

ibex_rotate -o -u -0.97719,0.198474,0.075553 -w ibex-sun -t 2016/09:13:04:55:42 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.977190,+0.198474,+0.075553 
which is R.A. +168.519 Decl. +4.333 
missing R.A. +171.350 Decl. +3.712 (ibex-sun) 
error is R.A. +2.831 Decl. +0.621 
for a total 2.891 deg 

ibex_rotate -o -u -0.97719,0.198474,0.075553 -w ibex-sun -t 2016/09:16:14:38:36 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.977190,+0.198474,+0.075553 
which is R.A. +168.519 Decl. +4.333 
missing R.A. +174.326 Decl. +2.420 (ibex-sun) 
error is R.A. +5.807 Decl. +1.913 
for a total 6.105 deg 

Th inertial 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 -u -0.990174,0.132047,0.046043 -w ibex-sun -t 2016/09:16:16:21:44 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.990174,+0.132047,+0.046043 
which is R.A. +172.404 Decl. +2.639 
missing R.A. +174.391 Decl. +2.392 (ibex-sun) 
error is R.A. +1.987 Decl. +0.247 
for a total 2.000 deg 

ibex_rotate -o -u -0.990174,0.132047,0.046043 -w ibex-sun -t 2016/09:16:17:56:50 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.990174,+0.132047,+0.046043 
which is R.A. +172.404 Decl. +2.639 
missing R.A. +174.451 Decl. +2.367 (ibex-sun) 
error is R.A. +2.047 Decl. +0.272 
for a total 2.063 deg 

ibex_rotate -o -u -0.990174,0.132047,0.046043 -w ibex-sun -t 2016/09:21:00:11:21 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.990174,+0.132047,+0.046043 
which is R.A. +172.404 Decl. +2.639 
missing R.A. +178.389 Decl. +0.719 (ibex-sun) 
error is R.A. +5.985 Decl. +1.920 
for a total 6.283 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 341 apogee: 

ibex_rotate -o -u -0.997878,0.062921,0.016754 -w ibex-sun -t 2016/09:21:02:25:17 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.997878,+0.062921,+0.016754 
which is R.A. +176.392 Decl. +0.960 
missing R.A. +178.475 Decl. +0.680 (ibex-sun) 
error is R.A. +2.083 Decl. +0.279 
for a total 2.101 deg 

ibex_rotate -o -u -0.997878,0.062921,0.016754 -w ibex-sun -t 2016-09-25T23:48:37.636Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI -0.997878,+0.062921,+0.016754 
which is R.A. +176.392 Decl. +0.960 
missing R.A. +182.742 Decl. -1.218 (ibex-sun) 
error is R.A. +6.350 Decl. +2.178 
for a total 6.712 deg 

No Lo O-mode. 

There is no overlap with orbit 339 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>, "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, August 30, 2016 10:44:00 AM 
Subject: IBEX Orbit# 340 ATS Approval (12 Sept 16 - 21 Sept 12) 

Guys, 

Here are the planning files and ATS for Orbit# 340. 

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

Approvals are required before 2 Sept 16 @1200 UTC 

Note the following: 

1. Battery Balancing at PERIGEE 

# Orbit# 340 PERIGEE: Battery Balancing 

# 2016-09-21T12:07:45.729Z,Perigee,orbit:340 

SetLongEclipseFlag TRUE $TIME=2016/09:21:11:00:00 

SetLongEclipseFlag FALSE $TIME=2016/09:21:12:30:00 

2. Command Load Constraint Violation Report 

IBEX_2016_256_o0340a_v001.scr 

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

HARD CONSTRAINT VIOLATIONS 

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

NO VIOLATIONS. 

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

SOFT CONSTRAINT VIOLATIONS 

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

IBX-CLC-016: No command to enable spin pulse protection was found after 

transition to science mode at 2016/09/13 03:29:18 UTC 

IBX-CLC-016: No command to enable spin pulse protection was found after 

transition to science mode at 2016/09/16 17:26:50 UTC 

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

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 

Notice: This e-mail is intended solely for use of the individual or entity to which it is addressed and may contain information that is proprietary, privileged and exempt from disclosure under applicable law. If the reader is not the intended recipient or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. This communication may also contain data subject to U.S. export laws. If so, that data subject to the International Traffic in Arms Regulation cannot be disseminated, distributed or copied to foreign nationals, residing in the U.S. or abroad, absent the express prior approval of the U.S. Department of State. If you have received this communication in error, please notify the sender by reply e-mail and destroy the e-mail message and any physical copies made of the communication. Thank you. 
********** ********** 

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