[Isocops] IBEX Orbit #661 ATS Approval (September 9 - 18, 2024)
Carol Weaver
Carol.Weaver at unh.edu
Fri Aug 30 14:49:27 EDT 2024
Hi all,
The angle at apogee descending is 4.069 deg after the sun maneuver.
The angle at Orbit 662 apogee after the sun maneuver is 4.911 deg.
I have looked at the orbit 0661 ATS file, IBEX_2024_253_o0661a_v001.scr and I approve.
The constraint violations in IBEX_2024_253_o0661a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2024_253_o0661a_v001.scr match those in the STF, IBEX_2024_253_o0661a_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_2024_253_o0661a_v001.oef and as verified with ibex_orbit.
There are 2 star tracker outages this orbit. Outage begins at 2024-09-09 14:39:06 and lasts for 11.2 hours. Outage begins at 2024-09-12 02:23:56 and lasts for 158.9 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit661_Contacts.txt for all contacts (4).
No Battery Balancing this orbit.
The Inertial maneuver at perigee of orbit 0660 left us pointing in safe directions for the orbit 0661 arc A ascending and descending sequences:
ibex_rotate -o -u -0.962119,0.253574,0.100136 -w ibex-sun -t 2024/09:09:15:04:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.962119,+0.253574,+0.100136
which is R.A. +165.235 Decl. +5.747
missing R.A. +168.124 Decl. +5.079 (ibex-sun)
error is R.A. +2.889 Decl. +0.668
for a total 2.952 deg
ibex_rotate -o -u -0.962119,0.253574,0.100136 -w ibex-sun -t 2024/09:13:15:30:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.962119,+0.253574,+0.100136
which is R.A. +165.235 Decl. +5.747
missing R.A. +171.638 Decl. +3.630 (ibex-sun)
error is R.A. +6.403 Decl. +2.117
for a total 6.724 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 +171.707 -d +3.602 -w ibex-sun -t 2024/09:13:17:21:07
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.987589,+0.143950,+0.062825
which is R.A. +171.707 Decl. +3.602
missing R.A. +171.707 Decl. +3.602 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +171.707 -d +3.602 -w ibex-sun -t 2024/09:13:18:48:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.987589,+0.143950,+0.062825
which is R.A. +171.707 Decl. +3.602
missing R.A. +171.762 Decl. +3.579 (ibex-sun)
error is R.A. +0.055 Decl. +0.023
for a total 0.059 deg
ibex_rotate -o -r +171.707 -d +3.602 -w ibex-sun -t 2024/09:17:19:13:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.987589,+0.143950,+0.062825
which is R.A. +171.707 Decl. +3.602
missing R.A. +175.447 Decl. +1.989 (ibex-sun)
error is R.A. +3.740 Decl. +1.613
for a total 4.069 deg
The Sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0662 apogee:
ibex_rotate -o -r +175.538 -d +1.946 -w ibex-sun -t 2024/09:17:21:32:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.996394,+0.077753,+0.033958
which is R.A. +175.538 Decl. +1.946
missing R.A. +175.538 Decl. +1.946 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +175.538 -d +1.946 -w ibex-sun -t 2024-09-23T00:28:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.996394,+0.077753,+0.033958
which is R.A. +175.538 Decl. +1.946
missing R.A. +180.049 Decl. +0.004 (ibex-sun)
error is R.A. +4.511 Decl. +1.942
for a total 4.911 deg
There is no overlap with orbit 0660 commands.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503-902-8492
From: NIgel Angold <nangold at princeton.edu>
Date: Friday, August 30, 2024 at 07:35
To: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Cc: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, Coca Gonzales, Andrea [US] (SP) <Andrea.CocaGonzales at ngc.com>, David Heirtzler <David.Heirtzler at unh.edu>, ADS-IBEX at l3harris.com <ADS-IBEX at l3harris.com>, IBEXOPS at gmail.com <IBEXOPS at gmail.com>, isocops at lists.sr.unh.edu <isocops at lists.sr.unh.edu>, kwfairchild at gmail.com <kwfairchild at gmail.com>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, angoldconsulting at earthlink.net <angoldconsulting at earthlink.net>, Paul.Janzen at mso.umt.edu <Paul.Janzen at mso.umt.edu>, Tyler, Ryan S [US] (SP) <Ryan.Tyler at ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn at ngc.com>
Subject: Re: [Isocops] IBEX Orbit #661 ATS Approval (September 9 - 18, 2024)
CAUTION: This email originated from outside of the University System. Do not click links or open attachments unless you recognize the sender and know the content is safe.
I approve IBEX_2023_253_o0661a_v001.scr
Nigel
Perry, Timothy E [US] (SP)<mailto:Timothy.Perry at ngc.com>
August 26, 2024 at 14:53
All,
Attached are the planning files for Orbit #661. Please respond to this thread with comments and approvals. Approvals for the Orbit 661 ATS are required by COB, 29 August 2024.
Please note the following:
1. Sun Maneuvers
Apogee – 2024/09/13 17:06:07
Perigee – 2024/09/17 21:17:11
1. Command Load Constraint Violation Report (CCVR)
IBEX_2024_253_o0661a_v001.ccvr
# Input files: 1
# IBEX_2024_253_o0661a_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 2024/09/09 13:36:15 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2024/09/13 18:18:54 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry at ngc.com<mailto:timothy.perry at ngc.com>
Office (703) 406-5976
IBEX MOC (703)404-7470
Cell (301) 606-1430
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