[Isocops] IBEX Orbit #629 ATS Approval (22 Nov - 2 Dec 2023)
Carol Weaver
Carol.Weaver at unh.edu
Fri Nov 10 14:28:39 EST 2023
Hi all,
The angle at desceding after the apogee sun maneuver is 4.122 deg.
I have looked at the orbit 0629 ATS file, IBEX_2023_326_o0629a_v001.scr and I approve.
The constraint violations in IBEX_2023_326_o0629a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2023_326_o0629a_v001.scr match those in the STF, IBEX_2023_326_o0629a_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_2023_326_o0629a_v001.oef and as verified with ibex_orbit.
There are 2 star tracker outages this orbit. First outage begins at 2023-11-25 02:33:45 and lasts for 39.0 hours. Second outage begins at 2023-11-29 01:17:15 and lasts for 7.3 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit629_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 0628 left us pointing in safe directions for the orbit 0629 arc A ascending and descending sequences:
ibex_rotate -o -u -0.535623,-0.771177,-0.34408 -w ibex-sun -t 2023/11:23:11:24:09
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.535624,-0.771178,-0.344081
which is R.A. +235.218 Decl. -20.126
missing R.A. +238.447 Decl. -20.295 (ibex-sun)
error is R.A. +3.229 Decl. +0.169
for a total 3.035 deg
ibex_rotate -o -u -0.535623,-0.771177,-0.34408 -w ibex-sun -t 2023/11:27:13:01:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.535624,-0.771178,-0.344081
which is R.A. +235.218 Decl. -20.126
missing R.A. +242.736 Decl. -21.055 (ibex-sun)
error is R.A. +7.518 Decl. +0.930
for a total 7.098 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 +242.815 -d -21.068 -w ibex-sun -t 2023/11:27:14:49:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.426326,-0.830074,-0.359476
which is R.A. +242.815 Decl. -21.068
missing R.A. +242.815 Decl. -21.068 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +242.815 -d -21.068 -w ibex-sun -t 2023/11:27:16:19:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.426326,-0.830074,-0.359476
which is R.A. +242.815 Decl. -21.068
missing R.A. +242.880 Decl. -21.079 (ibex-sun)
error is R.A. +0.065 Decl. +0.011
for a total 0.062 deg
ibex_rotate -o -r +242.815 -d -21.068 -w ibex-sun -t 2023/12:01:17:28:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.426326,-0.830074,-0.359476
which is R.A. +242.815 Decl. -21.068
missing R.A. +247.180 Decl. -21.761 (ibex-sun)
error is R.A. +4.365 Decl. +0.693
for a total 4.122 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0630 apogee:
ibex_rotate -o -u -0.391371,-0.840715,-0.374202 -w ibex-sun -t 2023/12:01:19:49:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.391371,-0.840715,-0.374202
which is R.A. +245.037 Decl. -21.975
missing R.A. +247.289 Decl. -21.780 (ibex-sun)
error is R.A. +2.252 Decl. +0.195
for a total 2.099 deg
ibex_rotate -o -u -0.391371,-0.840715,-0.374202 -w ibex-sun -t 2023-12-06T18:03:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.391371,-0.840715,-0.374202
which is R.A. +245.037 Decl. -21.975
missing R.A. +252.690 Decl. -22.463 (ibex-sun)
error is R.A. +7.653 Decl. +0.488
for a total 7.101 deg
There is no overlap with orbit 0628 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: Thursday, November 9, 2023 at 18:34
To: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>, Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin 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>, Wynn, Reese [US] (SP) <Reese.Wynn at ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley at ngc.com>
Subject: IBEX Orbit #629 ATS Approval (22 Nov - 2 Dec 2023)
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.
All,
Attached are the planning files for Orbit #629. Please respond to this thread with comments and approvals. Approvals are required by COB 12 Nov 2023
Please note the following:
1. Perigee Battery Balancing
The eclipse flag has been set for battery balancing
Orbit 629 Eclipse Flag Second Eclipse
# 2023-12-02T05:16:40.130Z,Perigee,orbit:629
@ECT_SetLongEclipseFlag TRUE $TIME=2023/12:02:06:00:00
@ECT_SetLongEclipseFlag FALSE $TIME=2023/12:02:07:30:00
2. Apogee Sun Maneuver
3. Command Load Constraint Violation Report (CCVR)
IBEX_2023_326_o0629a_v001.ccvr
# Input files: 1
# IBEX_2023_326_o0629a_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 2023/11/23 09:50:42 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2023/11/27 15:49:31 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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