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@ngc.com>
Date: Tuesday, February 20, 2024 at 13:00
To: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>, Carol Weaver <carol.weaver@unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, David Heirtzler <David.Heirtzler@unh.edu>, ADS-IBEX@l3harris.com <ADS-IBEX@l3harris.com>, IBEXOPS@gmail.com <IBEXOPS@gmail.com>,
isocops@lists.sr.unh.edu <isocops@lists.sr.unh.edu>, kwfairchild@gmail.com <kwfairchild@gmail.com>, Kenneth Fairchild <Ken.Fairchild@unh.edu>, angoldconsulting@earthlink.net <angoldconsulting@earthlink.net>, Paul.Janzen@mso.umt.edu <Paul.Janzen@mso.umt.edu>,
Tyler, Ryan S [US] (SP) <Ryan.Tyler@ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn@ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley@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
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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@ngc.com
