Hi all,

I have looked at the orbit 524 ATS files, IBEX_2021_103_o0524a_BUS_v001.scr, IBEX_2021_103_o0524a_INST_v001.scr and I approve.

The constraint violations in IBEX_2021_103_o0524a_BUS_v001.ccvr and IBEX_2021_103_o0524a_INST_v001.ccvr

are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_103_o0524a_INST_v001.scr match those in the STF, IBEX_2021_102_o0524a_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_102_o0524a_BUS_v001.oef and as verified with ibex_orbit.

There is one star tracker outage lasting for 4 hours prior to the perigee maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit524_Contacts.txt for all contacts (4).

Battery Balancing is 90.0 minutes long, 90.0 hours away from PL descending, and 6.2 hours away from the maneuver.

The Inertial maneuver at perigee of orbit 0523 left us pointing in safe directions for the orbit 0524 arc A ascending and descending sequences:

ibex_rotate -o -u 0.940256,0.315847,0.127117 -w ibex-sun -t 2021/04:12:13:34:20

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.940256,+0.315847,+0.127117

which is R.A. +18.568 Decl. +7.303

missing R.A. +20.856 Decl. +8.753 (ibex-sun)

error is R.A. +2.288 Decl. +1.450

for a total 2.690 deg

ibex_rotate -o -u 0.940256,0.315847,0.127117 -w ibex-sun -t 2021/04:16:08:23:10

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.940256,+0.315847,+0.127117

which is R.A. +18.568 Decl. +7.303

missing R.A. +24.458 Decl. +10.179 (ibex-sun)

error is R.A. +5.890 Decl. +2.876

for a total 6.493 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 0.910344,0.38359,0.155348 -w ibex-sun -t 2021/04:16:10:06:18

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.910344,+0.383590,+0.155348

which is R.A. +22.849 Decl. +8.937

missing R.A. +24.525 Decl. +10.206 (ibex-sun)

error is R.A. +1.676 Decl. +1.269

for a total 2.084 deg

ibex_rotate -o -u 0.910344,0.38359,0.155348 -w ibex-sun -t 2021/04:16:11:41:24

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.910344,+0.383590,+0.155348

which is R.A. +22.849 Decl. +8.937

missing R.A. +24.587 Decl. +10.231 (ibex-sun)

error is R.A. +1.738 Decl. +1.294

for a total 2.147 deg

ibex_rotate -o -u 0.910344,0.38359,0.155348 -w ibex-sun -t 2021/04:21:01:00:47

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.910344,+0.383590,+0.155348

which is R.A. +22.849 Decl. +8.937

missing R.A. +28.731 Decl. +11.786 (ibex-sun)

error is R.A. +5.882 Decl. +2.849

for a total 6.448 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0525 apogee:

ibex_rotate -o -u 0.874234,0.448948,0.184826 -w ibex-sun -t 2021/04:21:04:47:00

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.874234,+0.448948,+0.184826

which is R.A. +27.182 Decl. +10.651

missing R.A. +28.871 Decl. +11.831 (ibex-sun)

error is R.A. +1.689 Decl. +1.180

for a total 2.033 deg

ibex_rotate -o -u 0.874234,0.448948,0.184826 -w ibex-sun -t 2021-04-26T01:40:52

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.874234,+0.448948,+0.184826

which is R.A. +27.182 Decl. +10.651

missing R.A. +33.540 Decl. +13.481 (ibex-sun)

error is R.A. +6.358 Decl. +2.830

for a total 6.831 deg

There is no overlap with orbit 523 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-March-30 at 14:18
To: Weaver, Carol <Carol.Weaver@unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, Heirtzler, David <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>, Fairchild, Kenneth <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 #524 ATS Approval ( 12 – 21 Apr 21)

Caution - External Email

All,

Attached are the planning files for Orbit #524. Please respond to this thread with comments and approvals.

Approvals are required by COB on 02 April 2021

Please note the following:

I generated 3 separate ATS files BUS, INST and a complete file. The BUS and INST will be the files to be uplinked. The complete ATS, I used as a sanity check to see how the commands lined up. Since we are in a new phase of ATS generation. IF you have any ideas of doing this differently, let me know.

The 3 ATS files have been changed to word files and encrypted. I will send out another email with the password. The files that have been transferred via MFT have not been encrypted and are still text files.

I moved the 2 House Keeping commands from the INST ATS to the BUS ATS. I commented out the 2 commands in the INST ATS. If for some reason we were unable to uplink the INST Commands for this orbit, we would have been in the wrong spacecraft state for executing the maneuver commands.

Battery Balancing this orbit

Begin 2021/04:21:11:00:00– End 2021/04:21:12:30:00

# Orbit# 522 Reset Master Timer - 2021/04:03:03:15:00

Command Load Constraint Violation Report (CCVR)

# Input files: 1

# IBEX_2021_103_o0524a_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 2021/04/12 10:16:35 UTC

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

transition to science mode at 2021/04/16 11:11:24 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