[Isocops] IBEX Orbit #671 ATS Approval (December 10 - 20, 2024)
Carol Weaver
Carol.Weaver at unh.edu
Sun Dec 1 20:13:08 EST 2024
Hi all,
I have looked at the orbit 0671 ATS file, IBEX_2024_345_o0671a_v001.scr and I approve.
The constraint violations in IBEX_2024_345_o0671a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and transmissions being close together. The violations are acceptable.
The PL commands in IBEX_2024_345_o0671a_v001.scr match those in the STF, IBEX_2024_345_o0671a_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_345_o0671a_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit. Outage begins at 2024-12-14 15:38:01 and lasts for 86.1 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit671_Contacts.txt for all contacts (3).
Battery Balancing is 90 minutes long, more than 2 hours away from payload descending macros, 11.733 hrs, and more than 15 minutes away from a maneuver, 586 mins.
The Inertial maneuver at perigee of orbit 0670 left us pointing in safe directions for the orbit 0671 arc A ascending and descending sequences:
ibex_rotate -o -u -0.176393,-0.899168,-0.400477 -w ibex-sun -t 2024/12:11:01:47:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.176393,-0.899168,-0.400477
which is R.A. +258.901 Decl. -23.608
missing R.A. +258.256 Decl. -23.012 (ibex-sun)
error is R.A. +0.645 Decl. +0.596
for a total 0.840 deg
ibex_rotate -o -u -0.176393,-0.899168,-0.400477 -w ibex-sun -t 2024/12:14:02:18:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.176393,-0.899168,-0.400477
which is R.A. +258.901 Decl. -23.608
missing R.A. +261.618 Decl. -23.195 (ibex-sun)
error is R.A. +2.717 Decl. +0.413
for a total 2.528 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 -0.096391,-0.909613,-0.40412 -w ibex-sun -t 2024/12:14:04:01:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.096391,-0.909613,-0.404120
which is R.A. +263.951 Decl. -23.836
missing R.A. +261.697 Decl. -23.198 (ibex-sun)
error is R.A. +2.254 Decl. +0.638
for a total 2.163 deg
ibex_rotate -o -u -0.096391,-0.909613,-0.40412 -w ibex-sun -t 2024/12:14:05:36:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.096391,-0.909613,-0.404120
which is R.A. +263.951 Decl. -23.836
missing R.A. +261.769 Decl. -23.202 (ibex-sun)
error is R.A. +2.182 Decl. +0.634
for a total 2.099 deg
ibex_rotate -o -u -0.096391,-0.909613,-0.40412 -w ibex-sun -t 2024/12:19:06:16:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.096391,-0.909613,-0.404120
which is R.A. +263.951 Decl. -23.836
missing R.A. +267.232 Decl. -23.394 (ibex-sun)
error is R.A. +3.281 Decl. +0.442
for a total 3.039 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0672 apogee:
ibex_rotate -o -u -0.01443,-0.91346,-0.406673 -w ibex-sun -t 2024/12:19:08:13:34
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.014430,-0.913460,-0.406673
which is R.A. +269.095 Decl. -23.996
missing R.A. +267.323 Decl. -23.398 (ibex-sun)
error is R.A. +1.772 Decl. +0.598
for a total 1.729 deg
ibex_rotate -o -u -0.01443,-0.91346,-0.406673 -w ibex-sun -t 2024-12-24T06:09:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.014430,-0.913460,-0.406673
which is R.A. +269.095 Decl. -23.996
missing R.A. +272.880 Decl. -23.382 (ibex-sun)
error is R.A. +3.785 Decl. +0.614
for a total 3.520 deg
There is no overlap with orbit 0670 commands.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503-902-8492
From: NIgel Angold <nangold at princeton.edu>
Date: Saturday, November 30, 2024 at 20:42
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 <IBEXOPS at gmail.com>, isocops <isocops at lists.sr.unh.edu>, kwfairchild <kwfairchild at gmail.com>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, angoldconsulting at earthlink.net <angoldconsulting at earthlink.net>, paul.janzen <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 #671 ATS Approval (December 10 - 20, 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_2024_345_o0671a_v001.scr
Nigel
Perry, Timothy E [US] (SP)<mailto:Timothy.Perry at ngc.com>
November 27, 2024 at 09:56
All,
Attached are the planning files for Orbit #671. Please respond to this thread with comments and approvals. Approvals for the Orbit 671 ATS are required by COB, 30 November 2024.
Please note the following:
Battery Balancing
Eclipse Flag True: 2024/12/19 18:00:00
Eclipse Flag False: 2024/12/19 19:30:00
Command Load Constraint Violation Report (CCVR)
IBEX_2024_345_o0671a_v001.ccvr
# Input files: 1
# IBEX_2024_345_o0671a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
### The first 2 constraint violations are because of the contact “IBEX,USAK01,ADD,12/19/24,354,23:00:00,12/20/24,355,00:30:00,LAHO 160K IBEX-3 Orbit# 671 SSR_Dump/Tracking Contact/10 Asc” was scheduled for 90 minutes. This is not a problem.
IBX-CLC-006: Planned transmission at 2024/12/19 22:58:00 UTC - 2024/12/20
00:32:00 UTC exceeds the maximum contiguous transmission time of
5400 seconds
IBX-CLC-015: Battery charge falls below minimum from 2024/12/20 00:17:00 UTC -
2024/12/20 00:32:00 UTC. Lowest charge level is 7498.840000
watt-minutes during this interval.
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2024/12/11 00:35:58 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2024/12/14 05:06:31 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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