Hi all,

I have looked at the orbit 0539 ATS file, IBEX_2021_239_o0539a_v001.scr and I approve.

The constraint violations in IBEX_2021_239_o0539a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_239_o0539a_v001.scr match those in the STF, IBEX_2021_239_o0539a_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_239_o0539a_v001.oef and as verified with ibex_orbit.

No star tracker outage this orbit.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit539_Contacts.txt for all contacts (3).

We are doing Battery Balancing and it is appropriate length and placed away from instrument macros and maneuvers.

The Inertial maneuver at perigee of orbit 0538 left us pointing in safe directions for the orbit 0539 arc A ascending and descending sequences:

ibex_rotate -o -u -0.880372,0.43865,0.180365 -w ibex-sun -t 2021/08:27:19:06:12

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.880372,+0.438650,+0.180365

which is R.A. +153.515 Decl. +10.391

missing R.A. +156.301 Decl. +9.864 (ibex-sun)

error is R.A. +2.786 Decl. +0.527

for a total 2.793 deg

ibex_rotate -o -u -0.880372,0.43865,0.180365 -w ibex-sun -t 2021/08:31:10:44:53

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.880372,+0.438650,+0.180365

which is R.A. +153.515 Decl. +10.391

missing R.A. +159.528 Decl. +8.628 (ibex-sun)

error is R.A. +6.013 Decl. +1.763

for a total 6.186 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 -0.913727,0.376667,0.152399 -w ibex-sun -t 2021/08:31:12:28:01

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.913727,+0.376667,+0.152399

which is R.A. +157.597 Decl. +8.766

missing R.A. +159.593 Decl. +8.603 (ibex-sun)

error is R.A. +1.996 Decl. +0.163

for a total 1.980 deg

ibex_rotate -o -u -0.913727,0.376667,0.152399 -w ibex-sun -t 2021/08:31:14:03:07

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.913727,+0.376667,+0.152399

which is R.A. +157.597 Decl. +8.766

missing R.A. +159.654 Decl. +8.580 (ibex-sun)

error is R.A. +2.057 Decl. +0.186

for a total 2.042 deg

ibex_rotate -o -u -0.913727,0.376667,0.152399 -w ibex-sun -t 2021/09:05:01:46:04

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.913727,+0.376667,+0.152399

which is R.A. +157.597 Decl. +8.766

missing R.A. +163.842 Decl. +6.892 (ibex-sun)

error is R.A. +6.245 Decl. +1.874

for a total 6.464 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0540 apogee:

ibex_rotate -o -u -0.942244,0.31076,0.124918 -w ibex-sun -t 2021/09:05:05:25:10

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.942244,+0.310760,+0.124918

which is R.A. +161.747 Decl. +7.176

missing R.A. +163.980 Decl. +6.829 (ibex-sun)

error is R.A. +2.233 Decl. +0.347

for a total 2.243 deg

ibex_rotate -o -u -0.942244,0.31076,0.124918 -w ibex-sun -t 2021-09-09T21:37:34

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.942244,+0.310760,+0.124918

which is R.A. +161.747 Decl. +7.176

missing R.A. +168.066 Decl. +5.136 (ibex-sun)

error is R.A. +6.319 Decl. +2.040

for a total 6.605 deg

There is no overlap with orbit 0538 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: Friday, 2021-August-13 at 11:41
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 #539 ATS Approval (27 Aug – 05 Sept, 2021)

CAUTION: This email originated from outside of the University System. Do not click links or open attachments unless you recognize the sender and know the content is safe.

All,

Attached are the planning files for Orbit #538. Please respond to this thread with comments and approvals.

Approvals are required by COB 17 Aug 2021

Please note the following:

Battery Balancing this orbit

Begin 09/05/202111:00:00 – End 09/05/2021 12:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2021_239_o0539a_v001.ccvr

# Input files: 1

# IBEX_2021_239_o0539a_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 2021/08/27 16:16:33 UTC

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

transition to science mode at 2021/08/31 13:33:07 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