[Isocops] IBEX Orbit #506 ATS Approval (1 - 10 Nov 20)
Weaver, Carol
Carol.Weaver at unh.edu
Fri Oct 16 16:46:58 EDT 2020
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<https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fibex.unh.edu%2Fcgi-bin%2Fats.cgi&data=02%7C01%7Ccarol.weaver%40unh.edu%7C5e4d31212a244e9684af08d864990620%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C637369955686781675&sdata=eGot%2Ftz%2BxZR%2FQrizwV92geDfpqAh3Z3PbjnRGp%2FrFbw%3D&reserved=0>.
Command Approval Checklist is attached.
Thanks,
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com>
Date: Tuesday, 13 October 2020 at 16:32
To: "Weaver, Carol" <Carol.Weaver at unh.edu>, "Chubin, Eric [US] (IS)" <Eric.Chubin at ngc.com>, "Heirtzler, David" <David.Heirtzler at unh.edu>, "IBEX FDG (IBEX at applieddefense.info)" <IBEX at applieddefense.info>, IBEXOPS <IBEXOPS at gmail.com>, ISOC <isocops at lists.sr.unh.edu>, Ken Fairchild <fair-play at comcast.net>, "Ken Fairchild (kwfairchild at gmail.com)" <kwfairchild at gmail.com>, Nigel Angold <angoldconsulting at earthlink.net>, Paul Janzen <Paul.Janzen at mso.umt.edu>, "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com>, "Tyler, Ryan S [US] (IS)" <Ryan.Tyler at ngc.com>, "Wesley, Sheral R [US] (IS)" <Sheral.Wesley at ngc.com>, "Wynn, Reese [US] (IS)" <Reese.Wynn at 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:
1. 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.
1. 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.
1. 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.
1. 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.
1. 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
1. # Orbit# 504 Reset Master Timer - 2020/10:22:18:45:00
1. 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 at ngc.com
Office (703) 406-5976
Cell (301) 606-1430
[cid:image001.png at 01D6A3D3.948C06C0]
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