Here is the attachment.

Carol Weaver

University of New Hampshire

503.902.8492

From: Carol Weaver <Carol.Weaver@unh.edu>
Date: Friday, 2021-July-2 at 12:52
To: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, David Heirtzler <David.Heirtzler@unh.edu>, ADS-IBEX@l3harris.com <ADS-IBEX@l3harris.com>, IBEXOPS@gmail.com <IBEXOPS@gmail.com>, isocops@lists.sr.unh.edu <isocops@lists.sr.unh.edu>, fair-play@comcast.net <fair-play@comcast.net>, kwfairchild@gmail.com <kwfairchild@gmail.com>, Kenneth Fairchild <Ken.Fairchild@unh.edu>, angoldconsulting@earthlink.net <angoldconsulting@earthlink.net>, Paul.Janzen@mso.umt.edu <Paul.Janzen@mso.umt.edu>, Tyler, Ryan S [US] (SP) <Ryan.Tyler@ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley@ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn@ngc.com>
Subject: Re: IBEX Orbit #534 ATS Approval (13 - 22 July, 2021)

Hi all,

I have looked at the orbit 0534 ATS file, IBEX_2021_194_o0534a_v001.scr and I approve.

The constraint violations in IBEX_2021_194_o0534a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_194_o0534a_v001.scr match those in the STF, IBEX_2021_194_o0534a_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_2021_194_o0534a_v001.oef and as verified with ibex_orbit.

There are 1 star tracker outage this orbit. Outage begins after the perigee maneuver and lasts for ~7 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit534_Contacts.txt for all contacts (3).

Battery Balancing is 90 minutes long and placed appropriately from the maneuver and instrument commands.

The Inertial maneuver at perigee of orbit 0533 left us pointing in safe directions for the orbit 0534 arc A ascending and descending sequences:

ibex_rotate -o -u -0.319271,0.873015,0.368660 -w ibex-sun -t 2021/07:13:18:10:20

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.319271,+0.873015,+0.368660

which is R.A. +110.088 Decl. +21.633

missing R.A. +112.970 Decl. +21.739 (ibex-sun)

error is R.A. +2.882 Decl. +0.106

for a total 2.680 deg

ibex_rotate -o -u -0.319271,0.873015,0.368660 -w ibex-sun -t 2021/07:17:09:37:03

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.319271,+0.873015,+0.368660

which is R.A. +110.088 Decl. +21.633

missing R.A. +116.615 Decl. +21.191 (ibex-sun)

error is R.A. +6.527 Decl. +0.442

for a total 6.092 deg

The 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 -0.388321,0.84942,0.357341 -w ibex-sun -t 2021/07:17:11:20:11

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.388321,+0.849420,+0.357341

which is R.A. +114.568 Decl. +20.937

missing R.A. +116.689 Decl. +21.180 (ibex-sun)

error is R.A. +2.121 Decl. +0.243

for a total 1.994 deg

ibex_rotate -o -u -0.388321,0.84942,0.357341 -w ibex-sun -t 2021/07:17:12:55:17

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.388321,+0.849420,+0.357341

which is R.A. +114.568 Decl. +20.937

missing R.A. +116.757 Decl. +21.170 (ibex-sun)

error is R.A. +2.189 Decl. +0.233

for a total 2.056 deg

ibex_rotate -o -u -0.388321,0.84942,0.357341 -w ibex-sun -t 2021/07:21:23:39:04

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.388321,+0.849420,+0.357341

which is R.A. +114.568 Decl. +20.937

missing R.A. +121.304 Decl. +20.339 (ibex-sun)

error is R.A. +6.736 Decl. +0.598

for a total 6.332 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0535 apogee:

ibex_rotate -o -u -0.457592,0.819336,0.345396 -w ibex-sun -t 2021/07:22:02:56:19

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.457592,+0.819336,+0.345396

which is R.A. +119.183 Decl. +20.206

missing R.A. +121.435 Decl. +20.307 (ibex-sun)

error is R.A. +2.252 Decl. +0.101

for a total 2.115 deg

ibex_rotate -o -u -0.457592,0.819336,0.345396 -w ibex-sun -t 2021-07-26T21:26:44

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.457592,+0.819336,+0.345396

which is R.A. +119.183 Decl. +20.206

missing R.A. +126.062 Decl. +19.326 (ibex-sun)

error is R.A. +6.879 Decl. +0.880

for a total 6.533 deg

There is no overlap with orbit 0533 commands.

Command Approval Checklist is attached.

Carol

Carol Weaver

University of New Hampshire

503.902.8492

From: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>
Date: Thursday, 2021-July-1 at 09:21
To: Carol Weaver <Carol.Weaver@unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, David Heirtzler <David.Heirtzler@unh.edu>, ADS-IBEX@l3harris.com <ADS-IBEX@l3harris.com>, IBEXOPS@gmail.com <IBEXOPS@gmail.com>, isocops@lists.sr.unh.edu <isocops@lists.sr.unh.edu>, fair-play@comcast.net <fair-play@comcast.net>, kwfairchild@gmail.com <kwfairchild@gmail.com>, Kenneth Fairchild <Ken.Fairchild@unh.edu>, angoldconsulting@earthlink.net <angoldconsulting@earthlink.net>, Paul.Janzen@mso.umt.edu <Paul.Janzen@mso.umt.edu>, Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>, Tyler, Ryan S [US] (SP) <Ryan.Tyler@ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley@ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn@ngc.com>
Subject: IBEX Orbit #534 ATS Approval (13 - 22 July, 2021)

Caution - External Email

All,

Attached are the planning files for Orbit #534. Please respond to this thread with comments and approvals.

Approvals are required by COB on 02 July 2021

Please note the following:

Battery Balancing this orbit

Begin 2021/07:22:09:00:00– End 2021/07:22:10:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2021_194_o0534a_v001.ccvr

# Input files: 1

# IBEX_2021_194_o0534a_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 2021/07/13 15:29:15 UTC

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

transition to science mode at 2021/07/17 12:25:17 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Timothy E.Perry

CRS IBEX OCO-2

Mission Operations

timothy.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430