Hi all,

I have looked at the orbit 0540 ATS file, IBEX_2021_248_o0540a_v001.scr and I approve.

The constraint violations in IBEX_2021_248_o0540a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_248_o0540a_v001.scr match those in the STF, IBEX_2021_248_o0540a_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_248_o0540a_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_Orbit540_Contacts.txt for all contacts (3).

We are doing battery balancing and it is appropriate distance from instrument macros and maneuvers.

The Inertial maneuver at perigee of orbit 0539 left us pointing in safe directions for the orbit 0540 arc A ascending and descending sequences:

ibex_rotate -o -u -0.942244,0.31076,0.124918 -w ibex-sun -t 2021/09:05:20:24:14

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. +164.516 Decl. +6.581 (ibex-sun)

error is R.A. +2.769 Decl. +0.595

for a total 2.813 deg

ibex_rotate -o -u -0.942244,0.31076,0.124918 -w ibex-sun -t 2021/09:09:10:01:44

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. +167.628 Decl. +5.313 (ibex-sun)

error is R.A. +5.881 Decl. +1.863

for a total 6.136 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 -0.964643,0.245616,0.095585 -w ibex-sun -t 2021/09:09:11:44:52

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.964643,+0.245616,+0.095585

which is R.A. +165.715 Decl. +5.485

missing R.A. +167.693 Decl. +5.287 (ibex-sun)

error is R.A. +1.978 Decl. +0.198

for a total 1.979 deg

ibex_rotate -o -u -0.964643,0.245616,0.095585 -w ibex-sun -t 2021/09:09:13:19:58

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.964643,+0.245616,+0.095585

which is R.A. +165.715 Decl. +5.485

missing R.A. +167.753 Decl. +5.263 (ibex-sun)

error is R.A. +2.038 Decl. +0.222

for a total 2.041 deg

ibex_rotate -o -u -0.964643,0.245616,0.095585 -w ibex-sun -t 2021/09:13:22:16:12

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.964643,+0.245616,+0.095585

which is R.A. +165.715 Decl. +5.485

missing R.A. +171.801 Decl. +3.552 (ibex-sun)

error is R.A. +6.086 Decl. +1.933

for a total 6.367 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0541 apogee:

ibex_rotate -o -u -0.9817,0.178104,0.067406 -w ibex-sun -t 2021/09:14:01:45:55

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.981700,+0.178104,+0.067406

which is R.A. +169.717 Decl. +3.865

missing R.A. +171.934 Decl. +3.489 (ibex-sun)

error is R.A. +2.217 Decl. +0.376

for a total 2.244 deg

ibex_rotate -o -u -0.9817,0.178104,0.067406 -w ibex-sun -t 2021-09-18T18:12:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.981700,+0.178104,+0.067406

which is R.A. +169.717 Decl. +3.865

missing R.A. +176.011 Decl. +1.740 (ibex-sun)

error is R.A. +6.29

There is no overlap with orbit 0539 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: Tuesday, 2021-August-24 at 16:58
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 #540 ATS Approval (05 - 14 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 #540. Please respond to this thread with comments and approvals.

Approvals are required by COB 26 Aug 2021

Please note the following:

Battery Balancing this orbit

Begin 09/14/2021 07:00:00– End 09/14/2021 08:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2021_248_o0540a_v001.ccvr

# Input files: 1

# IBEX_2021_248_o0540a_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 2021/09/05 17:30:05 UTC

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

transition to science mode at 2021/09/09 12:49:58 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