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

From: "Wesley.Sheral" <sheral.wesley@orbitalatk.com>
To: "David Heirtzler" <dheirtzl@atlas.sr.unh.edu>, "IBEX-FDG" <IBEX.fdg@applieddefense.com>, "IBEXOPS" <IBEXOPS@gmail.com>, "ISOC" <isocops@lists.sr.unh.edu>, "Ken Fairchild" <fair-play@comcast.net>, "Lockwood.Robert" <robert.lockwood@orbitalatk.com>, "Michelle Reno" <mreno@swri.edu>, "Nigel Angold" <nigel.angold@nasa.gov>, "Paul Janzen" <paul.janzen@umontana.edu>, "Perry.Tim" <tim.perry@orbitalatk.com>, "Tyler.Ryan" <ryan.tyler@orbitalatk.com>, "Wesley.Sheral" <sheral.wesley@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

cid:image001.jpg@01D04F6C.5A1C97F0

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