[Isocops] IBEX Orbit #640 ATS Approval (3 Mar - 12 Mar 2024)
Carol Weaver
Carol.Weaver at unh.edu
Wed Feb 21 09:35:09 EST 2024
Hi all,
I have looked at the orbit 0640 ATS file, IBEX_2024_063_o0640a_v001.scr and I approve.
The constraint violations in IBEX_2024_063_o0640a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and a very short eclipse on 2024-03-07. The violations are acceptable.
The PL commands in IBEX_2024_063_o0640a_v001.scr match those in the STF, IBEX_2024_063_o0640a_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_063_o0640a_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit. Outage begins at 2024-03-11 12:44:30 and lasts for 8.6 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit640_Contacts.txt for all contacts (3).
No Battery Balancing this orbit.
The Inertial maneuver at perigee of orbit 0639 left us pointing in safe directions for the orbit 0640 arc A ascending and descending sequences:
ibex_rotate -o -u 0.959973,-0.252847,-0.120501 -w ibex-sun -t 2024/03:03:12:50:16
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.959973,-0.252847,-0.120501
which is R.A. +345.244 Decl. -6.921
missing R.A. +344.418 Decl. -6.663 (ibex-sun)
error is R.A. +0.826 Decl. +0.258
for a total 0.860 deg
ibex_rotate -o -u 0.959973,-0.252847,-0.120501 -w ibex-sun -t 2024/03:07:03:17:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.959973,-0.252847,-0.120501
which is R.A. +345.244 Decl. -6.921
missing R.A. +347.863 Decl. -5.195 (ibex-sun)
error is R.A. +2.619 Decl. +1.726
for a total 3.124 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 0.979523,-0.180907,-0.088355 -w ibex-sun -t 2024/03:07:05:00:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.979523,-0.180907,-0.088355
which is R.A. +349.536 Decl. -5.069
missing R.A. +347.929 Decl. -5.166 (ibex-sun)
error is R.A. +1.607 Decl. +0.097
for a total 1.603 deg
ibex_rotate -o -u 0.979523,-0.180907,-0.088355 -w ibex-sun -t 2024/03:07:06:35:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.979523,-0.180907,-0.088355
which is R.A. +349.536 Decl. -5.069
missing R.A. +347.991 Decl. -5.139 (ibex-sun)
error is R.A. +1.545 Decl. +0.070
for a total 1.541 deg
ibex_rotate -o -u 0.979523,-0.180907,-0.088355 -w ibex-sun -t 2024/03:11:16:16:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.979523,-0.180907,-0.088355
which is R.A. +349.536 Decl. -5.069
missing R.A. +351.957 Decl. -3.454 (ibex-sun)
error is R.A. +2.421 Decl. +1.615
for a total 2.904 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0641 apogee:
ibex_rotate -o -u 0.992133,-0.110514,-0.058819 -w ibex-sun -t 2024/03:11:22:26:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.992133,-0.110514,-0.058819
which is R.A. +353.644 Decl. -3.372
missing R.A. +352.182 Decl. -3.369 (ibex-sun)
error is R.A. +1.462 Decl. +0.003
for a total 1.460 deg
ibex_rotate -o -u 0.992133,-0.110514,-0.058819 -w ibex-sun -t 2024-03-16T19:37:40
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.992133,-0.110514,-0.058819
which is R.A. +353.644 Decl. -3.372
missing R.A. +356.759 Decl. -1.384 (ibex-sun)
error is R.A. +3.115 Decl. +1.988
for a total 3.693 deg
There is an overlap with a contact in the orbit 0639 commands. This is acceptable.
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: Tuesday, February 20, 2024 at 13:00
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 #640 ATS Approval (3 Mar - 12 Mar 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.
All,
Attached are the planning files for Orbit #639. Please respond to this thread with comments and approvals. Approvals are required by COB 21 Feb 2024.
Please note the following:
No Battery Balancing
SHORT Eclipse ASC. Apogee/ No eclipse commands needed
Command Load Constraint Violation Report (CCVR)
IBEX_2024_063_o0640a_v001.ccvr
# Input files: 1
# IBEX_2024_063_o0640a_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 2024/03/03 11:05:15 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2024/03/07 06:05:18 UTC
==============
OTHER MESSAGES
SHORT Eclipse ASC. Apogee/ No eclipse commands needed
2024-03-07T01:32:28.336Z,PenumbraEntry,orbit:640
2024-03-07T01:32:28.336Z,EclipseEntry,moderate:false,long:false,orbit:640
2024-03-07T01:45:14.277Z,PenumbraExit,orbit:640
2024-03-07T01:45:14.277Z,EclipseExit,moderate:false,long:false,orbit:640
==============
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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