Hi all,

I’ve looked at the orbit 459 ATS (IBEX_2019_242_o0459a_v001.scr) and I approve.

The only constraint violations in IBEX_2019_242_o0459a_v001.ccvr are the removal of the spin pulse protection commands (2); the violations are expected.

The PL commands in the v001 ATS match those in the v002 STF: IBEX_2019_242_o0459a_v002.stf

Ascending and descending command sequences are consistent with each other, 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF (IBEX_2019_242_o0459a_v001.oef) and as verified with ibex_orbit.

There are no star tracker outages during orbit 459.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file (IBEX_Orbit459_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 precession maneuver at perigee of orbit 458 left us pointing in safe directions for the orbit 459 arc A ascending and descending sequences:

ibex_rotate -o -u -0.898875,0.405555,0.165977 -w ibex-sun -t 2019/08:30:17:48:48

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.898875,+0.405555,+0.165977

which is R.A. +155.716 Decl. +9.554

missing R.A. +158.524 Decl. +8.994 (ibex-sun)

error is R.A. +2.808 Decl. +0.560

for a total 2.827 deg

ibex_rotate -o -u -0.898875,0.405555,0.165977 -w ibex-sun -t 2019/09:03:05:28:32

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.898875,+0.405555,+0.165977

which is R.A. +155.716 Decl. +9.554

missing R.A. +161.615 Decl. +7.784 (ibex-sun)

error is R.A. +5.899 Decl. +1.770

for a total 6.094 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 -0.928736,0.344047,0.138136 -w ibex-sun -t 2019/09:03:06:53:15

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.928736,+0.344047,+0.138136

which is R.A. +159.673 Decl. +7.940

missing R.A. +161.669 Decl. +7.764 (ibex-sun)

error is R.A. +1.996 Decl. +0.176

for a total 1.985 deg

ibex_rotate -o -u -0.928736,0.344047,0.138136 -w ibex-sun -t 2019/09:03:08:46:46

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.928736,+0.344047,+0.138136

which is R.A. +159.673 Decl. +7.940

missing R.A. +161.741 Decl. +7.736 (ibex-sun)

error is R.A. +2.068 Decl. +0.204

for a total 2.059 deg

ibex_rotate -o -u -0.928736,0.344047,0.138136 -w ibex-sun -t 2019/09:07:16:25:28

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.928736,+0.344047,+0.138136

which is R.A. +159.673 Decl. +7.940

missing R.A. +165.758 Decl. +6.110 (ibex-sun)

error is R.A. +6.085 Decl. +1.830

for a total 6.310 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 460 apogee:

ibex_rotate -o -u -0.954056,0.278371,0.110845 -w ibex-sun -t 2019/09:07:18:59:48

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.954056,+0.278371,+0.110845

which is R.A. +163.734 Decl. +6.364

missing R.A. +165.854 Decl. +6.065 (ibex-sun)

error is R.A. +2.120 Decl. +0.299

for a total 2.129 deg

ibex_rotate -o -u -0.954056,0.278371,0.110845 -w ibex-sun -t 2019/09:12:14:01:56

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.954056,+0.278371,+0.110845

which is R.A. +163.734 Decl. +6.364

missing R.A. +170.040 Decl. +4.295 (ibex-sun)

error is R.A. +6.306 Decl. +2.069

for a total 6.610 deg

No Lo O-mode

There is no overlap with orbit 458 commands by manual inspection or by checking http://ibex.unh.edu/cgi-bin/ats.cgi

Command Approval Checklist is attached.

Thanks,

Carol

Carol Weaver

University of New Hampshire

503.902.8492

From: "Perry, Timothy" <Timothy.Perry@ngc.com>
Date: Monday, 19August 2019 at 12:10
To: "Weaver, Carol" <Carol.Weaver@unh.edu>, "Chubin, Eric" <Eric.Chubin@ngc.com>, "Joyce, Colin" <Colin.Joyce@unh.edu>, "Heirtzler, David" <David.Heirtzler@unh.edu>, "Dreyer, Sean" <Sean.Dreyer@ngc.com>, IBEX-FDG <ibex.fdg@applieddefense.com>, IBEXOPS <ibexops@gmail.com>, ISOC <isocops@lists.sr.unh.edu>, KEN FAIRCHILD <fair-play@comcast.net>, "Ken Fairchild (kwfairchild@gmail.com)" <kwfairchild@gmail.com>, Nigel Angold <nigel.angold@nasa.gov>, Nigel Angold <angoldconsulting@earthlink.net>, Paul Janzen <paul.janzen@umontana.edu>, "Perry, Timothy" <Timothy.Perry@ngc.com>, "Tyler, Ryan" <Ryan.Tyler@ngc.com>, "Wesley, Sheral" <Sheral.Wesley@ngc.com>
Subject: IBEX Orbit #459 ATS Approval ( 30 Aug - 8 Sept 2019 )

Caution - External Email

All,

Attached are the planning files for Orbit #459

Please respond to this thread with comments and approvals.

Approvals are required by 1700 on 20 Aug 2019.

Please note the following:

Battery Balancing

# Orbit 459 Battery Balancing

# 2019-09-08T03:23:24.769Z,Perigee,orbit:459

@ECT_SetLongEclipseFlag TRUE $TIME=2019/09:08:03:00:00

@ECT_SetLongEclipseFlag FALSE $TIME=2019/09:08:04:30:00

Command Load Constraint Violation Report (CCVR)

# IBEX_2019_242_o0459a_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 2019/08/30 15:47:44 UTC

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

transition to science mode at 2019/09/03 08:16:46 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Timothy E.Perry

CRS IBEX OCO-2

Mission Operations

tim.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430

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Thank you.
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