[Isocops] IBEX Orbit #668 ATS Approval (13 Nov - 22 Nov 24)
Carol Weaver
Carol.Weaver at unh.edu
Thu Oct 31 18:01:45 EDT 2024
Hi all,
The angle at descending after the apogee sun maneuver is 4.182 deg.
I have looked at the orbit 0668 ATS file, IBEX_2024_318_o0668a_v001.scr and I approve.
The constraint violations in IBEX_2024_318_0668_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2024_318_o0668a_v001.scr match those in the STF, IBEX_2024_318_o0668a_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_318_o0668a_v001.oef and as verified with ibex_orbit.
There are 2 star tracker outages this orbit. They result in an apogee sun maneuver
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit668_Contacts.txt for all contacts (3).
Battery Balancing is 90 minutes long, more than 2 hours away from payload descending macros, and more than 15 minutes away from a maneuver.
The Inertial maneuver at perigee of orbit 0667 left us pointing in safe directions for the orbit 0668 arc A ascending and descending sequences:
ibex_rotate -o -u -0.664446,-0.682073,-0.305429 -w ibex-sun -t 2024/11:13:13:19:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.664446,-0.682073,-0.305429
which is R.A. +225.750 Decl. -17.784
missing R.A. +228.920 Decl. -18.112 (ibex-sun)
error is R.A. +3.170 Decl. +0.328
for a total 3.034 deg
ibex_rotate -o -u -0.664446,-0.682073,-0.305429 -w ibex-sun -t 2024/11:17:16:15:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.664446,-0.682073,-0.305429
which is R.A. +225.750 Decl. -17.784
missing R.A. +233.134 Decl. -19.101 (ibex-sun)
error is R.A. +7.384 Decl. +1.317
for a total 7.127 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 +233.211 -d -19.118 -w ibex-sun -t 2024/11:17:18:03:50
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.565840,-0.756677,-0.327515
which is R.A. +233.211 Decl. -19.118
missing R.A. +233.211 Decl. -19.118 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +233.211 -d -19.118 -w ibex-sun -t 2024/11:17:19:33:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.565840,-0.756677,-0.327515
which is R.A. +233.211 Decl. -19.118
missing R.A. +233.275 Decl. -19.132 (ibex-sun)
error is R.A. +0.064 Decl. +0.014
for a total 0.062 deg
ibex_rotate -o -r +233.211 -d -19.118 -w ibex-sun -t 2024/11:21:22:15:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.565840,-0.756677,-0.327515
which is R.A. +233.211 Decl. -19.118
missing R.A. +237.533 Decl. -20.071 (ibex-sun)
error is R.A. +4.322 Decl. +0.953
for a total 4.182 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0669 apogee:
ibex_rotate -o -u -0.532916,-0.772765,-0.344725 -w ibex-sun -t 2024/11:22:00:14:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.532916,-0.772765,-0.344725
which is R.A. +235.409 Decl. -20.165
missing R.A. +237.623 Decl. -20.092 (ibex-sun)
error is R.A. +2.214 Decl. +0.073
for a total 2.080 deg
ibex_rotate -o -u -0.532916,-0.772765,-0.344725 -w ibex-sun -t 2024-11-27T00:45:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.532916,-0.772765,-0.344725
which is R.A. +235.409 Decl. -20.165
missing R.A. +242.993 Decl. -21.091 (ibex-sun)
error is R.A. +7.584 Decl. +0.926
for a total 7.157 deg
[carolweav at ena v01]$
There is no overlap with orbit 0667 commands.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503-902-8492
From: Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>
Date: Wednesday, October 30, 2024 at 19:44
To: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>, bhautama at gmail.com <bhautama at gmail.com>, Carol Weaver <carol.weaver at unh.edu>, Cavallo, John A [US] (SP) <John.Cavallo at ngc.com>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, Coca Gonzales, Andrea [US] (SP) <Andrea.CocaGonzales at ngc.com>, Fleming, Ed [US] (SP) <Ed.Fleming at ngc.com>, ADS-IBEX at l3harris.com <ADS-IBEX at l3harris.com>, ibexops <ibexops at gmail.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>, Leonard, Ben [US] (SP) <Benjamin.Leonard at ngc.com>, angoldconsulting at earthlink.net <angoldconsulting at earthlink.net>, Nigel Angold <nangold at princeton.edu>, Reed, Cheryl L [US] (SP) <Cheryl.Reed at ngc.com>, Tyler, Ryan S [US] (SP) <Ryan.Tyler at ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn at ngc.com>, ezirnstein at swri.edu <ezirnstein at swri.edu>, Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>
Subject: IBEX Orbit #668 ATS Approval (13 Nov - 22 Nov 24)
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.
Please note the following:
1. Apogee Sun Maneuver
2. PERIGEE Battery Balancing
# 2024-11-22T10:09:48.648Z,Perigee,orbit:668
SetLongEclipseFlag TRUE $TIME=2024/11:22:09:00:00
SetLongEclipseFlag FALSE $TIME=2024/11:22:10:30:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2024_318_o0668a_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 2024/11/13 12:04:38 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2024/11/17 19:03:56 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Best Regards,
Sheral Wesley | Sr Principal Engineer, Satellite Systems
Northrop Grumman Corporation | Space Systems
O: 703-406-5641 | C: 202-236-0802 | sheral.wesley at ngc.com<mailto:sheral.wesley at ngc.com>
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