Hi all,

I approve IBEX_2020_305_o0506a_BUS_v001.scr and IBEX_2020_305_o0506a_INST_v001.scr

Constraint violations: IBEX_2020_305_o0506a_INST_v001.ccvr, IBEX_2020_305_o0506a_BUS_v001.ccvr have the 2 expected violations from removal of ACT_SetSpinPulseProtectEnable

PL commands in IBEX_2020_305_o0506a_INST_v001.scr match those in IBEX_2020_305_o0506a_v002.stf

Star Tracker Outage: 1 outage that begins before Orbit 505 apogee and runs for ~8 days.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit506_Contacts.txt for the (4) contacts. There is another contact scheduled before the Apogee maneuver to verify the star tracker has returned to nominal after the star tracker outage.

We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.

The sun precession maneuver at perigee of 505 left us pointing in a safe direction for the orbit 506 arc A ascending and descending sequences:

ibex_rotate -o -r +215.767 -d -14.210 -w ibex-sun -t 2020/10:31:23:19:59

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.786574,-0.566607,-0.245477

which is R.A. +215.767 Decl. -14.210

missing R.A. +216.359 Decl. -14.433 (ibex-sun)

error is R.A. +0.592 Decl. +0.223

for a total 0.615 deg

ibex_rotate -o -r +215.767 -d -14.210 -w ibex-sun -t 2020/11:04:17:08:25

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.786574,-0.566607,-0.245477

which is R.A. +215.767 Decl. -14.210

missing R.A. +219.942 Decl. -15.549 (ibex-sun)

error is R.A. +4.175 Decl. +1.339

for a total 4.251 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 -0.760177,-0.592037,-0.267625 -w ibex-sun -t 2020/11:04:18:51:24

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.760177,-0.592037,-0.267625

which is R.A. +217.912 Decl. -15.523

missing R.A. +220.012 Decl. -15.570 (ibex-sun)

error is R.A. +2.100 Decl. +0.047

for a total 2.023 deg

ibex_rotate -o -u -0.760177,-0.592037,-0.267625 -w ibex-sun -t 2020/11:04:20:26:39

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.760177,-0.592037,-0.267625

which is R.A. +217.912 Decl. -15.523

missing R.A. +220.077 Decl. -15.589 (ibex-sun)

error is R.A. +2.165 Decl. +0.066

for a total 2.086 deg

ibex_rotate -o -u -0.760177,-0.592037,-0.267625 -w ibex-sun -t 2020/11:09:08:58:17

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.760177,-0.592037,-0.267625

which is R.A. +217.912 Decl. -15.523

missing R.A. +224.676 Decl. -16.935 (ibex-sun)

error is R.A. +6.764 Decl. +1.412

for a total 6.645 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 507 apogee:

ibex_rotate -o -u -0.706586,-0.645631,-0.28965 -w ibex-sun -t 2020/11:09:12:33:30

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.706586,-0.645631,-0.289650

which is R.A. +222.419 Decl. -16.837

missing R.A. +224.834 Decl. -16.986 (ibex-sun)

error is R.A. +2.415 Decl. +0.149

for a total 2.315 deg

ibex_rotate -o -u -0.706586,-0.645631,-0.28965 -w ibex-sun -t 2020/11:14:06:28:25

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.706586,-0.645631,-0.289650

which is R.A. +222.419 Decl. -16.837

missing R.A. +229.578 Decl. -18.253 (ibex-sun)

error is R.A. +7.159 Decl. +1.416

for a total 6.971 deg

No overlapping commands 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: Tuesday, 13 October 2020 at 16:32
To: "Weaver, Carol" <Carol.Weaver@unh.edu>, "Chubin, Eric [US] (IS)" <Eric.Chubin@ngc.com>, "Heirtzler, David" <David.Heirtzler@unh.edu>, "IBEX FDG (IBEX@applieddefense.info)" <IBEX@applieddefense.info>, IBEXOPS <IBEXOPS@gmail.com>, ISOC <isocops@lists.sr.unh.edu>, Ken Fairchild <fair-play@comcast.net>, "Ken Fairchild (kwfairchild@gmail.com)" <kwfairchild@gmail.com>, Nigel Angold <angoldconsulting@earthlink.net>, Paul Janzen <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 #506 ATS Approval (1 - 10 Nov 20)

Caution - External Email

All,

Attached are the planning files for Orbit #506

Please respond to this thread with comments and approvals.

Approvals are required by COB on 18 October 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.

Apogee Inertial Maneuver – Just a note about the apogee inertial maneuver and the apogee contact. We will be entering into an antenna null just after the maneuver has completed. The maneuver occurs on 04 Nov 2020 18:41:24 and the apogee contact AOS time is 07 Nov 20 00:28:00. That will be a little over 53 hours. The concern is that we will exit a star tracker outage on 02 Nov 2020 20:05:41.

Battery Balancing this orbit

# Orbit 506 Battery Balancing

# 2020-11-09T18:25:39.001Z,Perigee,orbit:506

Begin - 2020/11:09:18:00:00 – End 2020/11:09:19:30:00

# Orbit# 504 Reset Master Timer - 2020/10:22:18:45:00

Command Load Constraint Violation Report (CCVR)

IBEX_2020_305_o0506a_v001.ccvr

# Input files: 1

# IBEX_2020_305_o0506a_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 2020/10/31 20:18:00 UTC

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

transition to science mode at 2020/11/04 19:56:39 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