Hi all,

Note: Angle at orbit 512 arc B descending after the apogee sun precession maneuver: 4.098 deg

I have looked at the orbit 512 ATS files IBEX_2020_359_o0512a_INST_v001.scr and IBEX_2020_359_o0512a_BUS_v001.scr and I approve.

The only constraint violations in IBEX_2020_359_o0512a_BUS_v001.ccvr and IBEX_2020_359_o0512a_INST_v001.ccvr are from the removal of the spin pulse commands which are expected

The PL commands in IBEX_2020_359_o0512a_v002.stf match those in IBEX_2020_359_o0512a_INST_v001.scr.

Ascending and descending command sequences are consistent with each other, 15 Re ascending, the apogee maneuver time, and 15 Re descending as determined by the OEF (IBEX_2020_359_o0512a_BUS_v001.oef) and as verified with ibex_orbit and crossingtimes.

There is one star tracker outage that begins 1.75 days after 16 Re ascending and lasts for ~4 days over the time of the apogee maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file IBEX_Orbit512_Contacts.txt for all contacts (4).

Battery balancing is appropriate length, and placed away from maneuvers and payload commands.

The inertial precession maneuver at perigee of orbit 511 left us pointing in safe directions for the orbit 512 arc A ascending and descending sequences:

ibex_rotate -o -u 0.070556,-0.911137,-0.406019 -w ibex-sun -t 2020/12:24:23:16:18

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.070556,-0.911137,-0.406019

which is R.A. +274.428 Decl. -23.955

missing R.A. +273.666 Decl. -23.416 (ibex-sun)

error is R.A. +0.762 Decl. +0.539

for a total 0.882 deg

ibex_rotate -o -u 0.070556,-0.911137,-0.406019 -w ibex-sun -t 2020/12:28:23:46:30

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.070556,-0.911137,-0.406019

which is R.A. +274.428 Decl. -23.955

missing R.A. +278.100 Decl. -23.216 (ibex-sun)

error is R.A. +3.672 Decl. +0.739

for a total 3.445 deg

The sun 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 -r +278.181 -d -23.211 -w ibex-sun -t 2020/12:29:01:34:38

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.130783,-0.909707,-0.394118

which is R.A. +278.181 Decl. -23.211

missing R.A. +278.181 Decl. -23.211 (ibex-sun)

error is R.A. +0.000 Decl. +0.000

for a total 0.001 deg

ibex_rotate -o -r +278.181 -d -23.211 -w ibex-sun -t 2020/12:29:03:04:44

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.130783,-0.909707,-0.394118

which is R.A. +278.181 Decl. -23.211

missing R.A. +278.249 Decl. -23.206 (ibex-sun)

error is R.A. +0.068 Decl. +0.005

for a total 0.063 deg

ibex_rotate -o -r +278.181 -d -23.211 -w ibex-sun -t 2021/01:02:03:02:18

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.130783,-0.909707,-0.394118

which is R.A. +278.181 Decl. -23.211

missing R.A. +282.623 Decl. -22.911 (ibex-sun)

error is R.A. +4.442 Decl. +0.300

for a total 4.098 deg

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 513 apogee:

ibex_rotate -o -u 0.229593,-0.888923,-0.396363 -w ibex-sun -t 2021/01:02:05:54:20

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.229593,-0.888923,-0.396363

which is R.A. +284.482 Decl. -23.351

missing R.A. +282.761 Decl. -22.905 (ibex-sun)

error is R.A. +1.721 Decl. +0.446

for a total 1.644 deg

ibex_rotate -o -u 0.229593,-0.888923,-0.396363 -w ibex-sun -t 2021-01-07T00:26:16

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.229593,-0.888923,-0.396363

which is R.A. +284.482 Decl. -23.351

missing R.A. +288.056 Decl. -22.385 (ibex-sun)

error is R.A. +3.574 Decl. +0.966

for a total 3.432 deg

Lo normal mode for the entire orbit.

There is no overlap with orbit 511 commands by manual inspection or by checking at http://ibex.unh.edu/cgi-bin/ats.cgi

Command approval checklist is attached.

Thanks,

Carol

Carol Weaver

University of New Hampshire

503.902.8492

From: Perry, Timothy E [US] (IS) <Timothy.Perry@ngc.com>
Date: Wednesday, 2020-December-9 at 10:18
To: Weaver, Carol <Carol.Weaver@unh.edu>, Chubin, Eric [US] (IS) <Eric.Chubin@ngc.com>, Heirtzler, David <David.Heirtzler@unh.edu>, IBEX@applieddefense.info <IBEX@applieddefense.info>, 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>, angoldconsulting@earthlink.net <angoldconsulting@earthlink.net>, Paul.Janzen@mso.umt.edu <Paul.Janzen@mso.umt.edu>, Perry, Timothy E [US] (IS) <Timothy.Perry@ngc.com>, Tyler, Ryan S [US] (IS) <Ryan.Tyler@ngc.com>, Wesley, Sheral R [US] (IS) <Sheral.Wesley@ngc.com>, Wynn, Reese [US] (IS) <Reese.Wynn@ngc.com>
Subject: IBEX Orbit #512 ATS Approval (24 Dec 20 – 3 Jan 21)

Caution - External Email

All,

Attached are the planning files for Orbit #512

Please respond to this thread with comments and approvals.

Approvals are required by COB on 12 December 2020

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

# Orbit 512 Battery Balancing

# 2021-01-02T13:53:42.032Z,Perigee,orbit:512

Begin - 2021/01:02:13:00:00 End - 2021/01:02:14:30:00

APOGEE: Sun Maneuver - $TIME=2020/12:29:01:19:38

# Orbit# 510 Reset Master Timer - 2020/12:15:23:15:00

Command Load Constraint Violation Report (CCVR)

IBEX_2020_359_o0512a_v001.ccvr

# Input files: 1

# IBEX_2020_359_o0512a_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 2020/12/24 21:07:28 UTC

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

transition to science mode at 2020/12/29 02:34:44 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