Hi all,

I approve IBEX_2020_314_o0507a_INST_v001.scr, IBEX_2020_314_o0507a_BUS_v001.scr

Constraint violations: IBEX_2020_314_o0507a_INST_v001.ccvr, IBEX_2020_314_o0507a_BUS_v001.ccvr have the 2 expected violations from removal of ACT_SetSpinPulseProtectEnable

PL commands in IBEX_2020_314_o0507a_INST_v001.scr match those in IBEX_2020_314_o0507a_v002.stf

Star Tracker Outage: 1 outage that occurs before the 507 apogee maneuver and lasts for ~30 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit507_Contacts.txt for the (4) contacts.

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

The inertial maneuver at perigee of 506 left us pointing in a safe direction for the orbit 507 arc A ascending and descending sequences:

ibex_rotate -o -u -0.706586,-0.645631,-0.28965 -w ibex-sun -t 2020/11:10:03:48:13

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. +225.491 Decl. -17.199 (ibex-sun)

error is R.A. +3.072 Decl. +0.362

for a total 2.959 deg

ibex_rotate -o -u -0.706586,-0.645631,-0.28965 -w ibex-sun -t 2020/11:13:19:26:51

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. +229.114 Decl. -18.142 (ibex-sun)

error is R.A. +6.695 Decl. +1.305

for a total 6.517 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 -0.647603,-0.695053,-0.312269 -w ibex-sun -t 2020/11:13:20:36:49

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.647603,-0.695053,-0.312269

which is R.A. +227.024 Decl. -18.196

missing R.A. +229.163 Decl. -18.154 (ibex-sun)

error is R.A. +2.139 Decl. +0.042

for a total 2.032 deg

ibex_rotate -o -u -0.647603,-0.695053,-0.312269 -w ibex-sun -t 2020/11:13:22:11:55

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.647603,-0.695053,-0.312269

which is R.A. +227.024 Decl. -18.196

missing R.A. +229.229 Decl. -18.170 (ibex-sun)

error is R.A. +2.205 Decl. +0.026

for a total 2.095 deg

ibex_rotate -o -u -0.647603,-0.695053,-0.312269 -w ibex-sun -t 2020/11:18:07:03:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.647603,-0.695053,-0.312269

which is R.A. +227.024 Decl. -18.196

missing R.A. +233.794 Decl. -19.262 (ibex-sun)

error is R.A. +6.770 Decl. +1.066

for a total 6.499 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 508 apogee:

ibex_rotate -o -u -0.58704,-0.739148,-0.330218 -w ibex-sun -t 2020/11:18:10:09:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.587040,-0.739148,-0.330218

which is R.A. +231.543 Decl. -19.282

missing R.A. +233.936 Decl. -19.300 (ibex-sun)

error is R.A. +2.393 Decl. +0.018

for a total 2.259 deg

ibex_rotate -o -u -0.58704,-0.739148,-0.330218 -w ibex-sun -t 2020/11:23:04:43:02

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.587040,-0.739148,-0.330218

which is R.A. +231.543 Decl. -19.282

missing R.A. +238.877 Decl. -20.350 (ibex-sun)

error is R.A. +7.334 Decl. +1.068

for a total 6.981 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: Nigel Angold <angoldconsulting@earthlink.net>
Date: Monday, 2020-October-26 at 20:20
To: Perry, Timothy E [US] (IS) <Timothy.Perry@ngc.com>
Cc: 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>, IBEX Operations <IBEXOPS@gmail.com>, ISOC <isocops@lists.sr.unh.edu>, Ken Fairchild <fair-play@comcast.net>, Ken Fairchild (kwfairchild@gmail.com) <kwfairchild@gmail.com>, Paul Janzen <Paul.Janzen@mso.umt.edu>, 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: Re: IBEX Orbit #507 ATS Approval (10 - 19 Nov 20)

Caution - External Email

I approve IBEX_2020_314_o0507a_BUS_v001.scr and IBEX_2020_314_o0507a_INST_v001.scr. I believe there will be enough room onboard to uplink them during the upcoming apogee contact on 28 October along with the 5 commands in the previously-approved ATS for the orbit 506 star tracker monitoring contact on 2 November.

Nigel

All,

   Attached are the planning files for Orbit #507

Please respond to this thread with comments and approvals.

Approvals are required by COB on 27 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. 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 507 Battery Balancing

# 2020-11-18T17:20:31.656Z,Perigee,orbit:507

Begin - 2020/11:18:17:00:00 -> End - 2020/11:18:18:30:00

5.       Orbit# 505 Reset Master Timer - 2020/11:01:00:50:00

6.       Command Load Constraint Violation Report (CCVR)

IBEX_2020_314_o0507a_v001.ccvr

#   IBEX_2020_314_o0507a_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 2020/11/10 00:58:45 UTC

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

             transition to science mode at 2020/11/13 21:41:55 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

<image001.png>

<IBEX_2020_314_o0507a_BUS_v001.ccvr><IBEX_2020_314_o0507a_v001.ccvr><IBEX_2020_314_o0507a_INST_v001.ccvr><IBEX_Orbit507_Contacts.txt><IBEX_2020_314_o0507a_INST_v001.oef><IBEX_2020_314_o0507a_BUS_v001.oef><IBEX_2020_314_o0507a_v001.docx><IBEX_2020_314_o0507a_INST_v001.docx><IBEX_2020_314_o0507a_BUS_v001.docx><IBEX-Command-Approval-Checklist-Rev16_F_507_TEP.docx>