Hi all,

I have looked at the orbit 0533 ATS file, IBEX_2021_185_o0533a_v001.scr and I approve.

The constraint violations in IBEX_2021_185_o0533a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_185_o0533a_v001.scr match those in the STF, IBEX_2021_185_o0533a_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_185_o0533a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins after the perigee maneuver and lasts for ~8 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit533_Contacts.txt for all contacts (3).

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

The Inertial maneuver at perigee of orbit 0532 left us pointing in safe directions for the orbit 0533 arc A ascending and descending sequences:

ibex_rotate -o -u -0.170334,0.907633,0.383651 -w ibex-sun -t 2021/07:04:12:11:06

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.170334,+0.907633,+0.383651

which is R.A. +100.629 Decl. +22.560

missing R.A. +103.504 Decl. +22.836 (ibex-sun)

error is R.A. +2.875 Decl. +0.276

for a total 2.667 deg

ibex_rotate -o -u -0.170334,0.907633,0.383651 -w ibex-sun -t 2021/07:08:05:51:29

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.170334,+0.907633,+0.383651

which is R.A. +100.629 Decl. +22.560

missing R.A. +107.323 Decl. +22.488 (ibex-sun)

error is R.A. +6.694 Decl. +0.072

for a total 6.183 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 -0.243985,0.893698,0.376531 -w ibex-sun -t 2021/07:08:07:34:37

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.243985,+0.893698,+0.376531

which is R.A. +105.270 Decl. +22.119

missing R.A. +107.398 Decl. +22.481 (ibex-sun)

error is R.A. +2.128 Decl. +0.362

for a total 2.001 deg

ibex_rotate -o -u -0.243985,0.893698,0.376531 -w ibex-sun -t 2021/07:08:09:09:43

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.243985,+0.893698,+0.376531

which is R.A. +105.270 Decl. +22.119

missing R.A. +107.467 Decl. +22.474 (ibex-sun)

error is R.A. +2.197 Decl. +0.355

for a total 2.063 deg

ibex_rotate -o -u -0.243985,0.893698,0.376531 -w ibex-sun -t 2021/07:12:22:55:34

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.243985,+0.893698,+0.376531

which is R.A. +105.270 Decl. +22.119

missing R.A. +112.215 Decl. +21.880 (ibex-sun)

error is R.A. +6.945 Decl. +0.239

for a total 6.443 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0534 apogee:

ibex_rotate -o -u -0.319271,0.873015,0.368660 -w ibex-sun -t 2021/07:13:02:20:50

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. +112.352 Decl. +21.855 (ibex-sun)

error is R.A. +2.264 Decl. +0.222

for a total 2.115 deg

ibex_rotate -o -u -0.319271,0.873015,0.368660 -w ibex-sun -t 2021-07-17T21:08:51

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. +117.109 Decl. +21.114 (ibex-sun)

error is R.A. +7.021 Decl. +0.519

for a total 6.558 deg

There is no overlap with orbit 0532 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-June-22 at 17:19
To: Bobbett, James E [US] (SP) <James.Bobbett@ngc.com>, bhautama@gmail.com <bhautama@gmail.com>, Carol Weaver <Carol.Weaver@unh.edu>, Cavallo, John A [US] (SP) <John.Cavallo@ngc.com>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, Fleming, Ed [US] (SP) <Ed.Fleming@ngc.com>, ADS-IBEX@l3harris.com <ADS-IBEX@l3harris.com>, ibexops@gmail.com <ibexops@gmail.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>, Leonard, Benjamin Y [US] (SP) <Benjamin.Leonard@ngc.com>, angoldconsulting@earthlink.net <angoldconsulting@earthlink.net>, nangold@princeton.edu <nangold@princeton.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>, ezirnstein@swri.edu <ezirnstein@swri.edu>
Subject: IBEX Orbit #533 ATS Approval (04 – 13 July, 2021)

Caution - External Email

All,

Attached are the planning files for Orbit #533. Please respond to this thread with comments and approvals.

Approvals are required by COB on 23 June 2021

Please note the following:

Battery Balancing this orbit

Begin 2021/07:13:08:00:00– End 2021/07:13:09:30:00

The OEF is larger than normal. I was running into issues generating the OEF file. I had to go a couple orbits back for MPS to generate the file.

Command Load Constraint Violation Report (CCVR)

IBEX_2021_185_o0533a_v001.ccvr

# Input files: 1

# IBEX_2021_185_o0533a_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 2021/07/04 09:34:00 UTC

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

transition to science mode at 2021/07/08 08:39:43 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