[Isocops] IBEX Orbit #604 Version 2 ATS Approval (09 - 18 Apr 2023)
Carol Weaver
Carol.Weaver at unh.edu
Wed Apr 5 09:51:13 EDT 2023
Hi all,
The angle at descending after the apogee sun maneuver is 3.961 degrees and the angle at the Orbit 605 apogee after doing the perigee sun maneuver is 4.953 degrees.
I have looked at the orbit 0604 ATS file, IBEX_2023_099_o0604a_v002.scr and I approve.
The constraint violations in IBEX_2023_099_o0604a_v002.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2023_099_o0604a_v002.scr match those in the STF, IBEX_2023_099_o0604a_v004.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_099_o0604a_v002.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit. It lasts for ~9.5 hours over the perigee maneuver window.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit604_Contacts_v2.txt for all contacts (3).
No Battery Balancing this orbit.
The Sun maneuver at perigee of orbit 0603 left us pointing in safe directions for the orbit 0604 arc A ascending and descending sequences:
ibex_rotate -o -r +17.225 -d +7.327 -w ibex-sun -t 2023/04:09:21:11:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.947350,+0.293707,+0.127532
which is R.A. +17.225 Decl. +7.327
missing R.A. +17.918 Decl. +7.575 (ibex-sun)
error is R.A. +0.693 Decl. +0.248
for a total 0.730 deg
ibex_rotate -o -r +17.225 -d +7.327 -w ibex-sun -t 2023/04:13:22:26:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.947350,+0.293707,+0.127532
which is R.A. +17.225 Decl. +7.327
missing R.A. +21.729 Decl. +9.130 (ibex-sun)
error is R.A. +4.504 Decl. +1.803
for a total 4.809 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 +21.799 -d +9.159 -w ibex-sun -t 2023/04:14:00:14:49
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.916654,+0.366617,+0.159175
which is R.A. +21.799 Decl. +9.159
missing R.A. +21.799 Decl. +9.159 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.001 deg
ibex_rotate -o -r +21.799 -d +9.159 -w ibex-sun -t 2023/04:14:01:44:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.916654,+0.366617,+0.159175
which is R.A. +21.799 Decl. +9.159
missing R.A. +21.858 Decl. +9.182 (ibex-sun)
error is R.A. +0.059 Decl. +0.023
for a total 0.062 deg
ibex_rotate -o -r +21.799 -d +9.159 -w ibex-sun -t 2023/04:18:02:50:06
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.916654,+0.366617,+0.159175
which is R.A. +21.799 Decl. +9.159
missing R.A. +25.543 Decl. +10.604 (ibex-sun)
error is R.A. +3.744 Decl. +1.445
for a total 3.961 deg
The Sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0605 apogee:
ibex_rotate -o -r +25.652 -d +10.640 -w ibex-sun -t 2023/04:18:05:48:59
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.885941,+0.425461,+0.184638
which is R.A. +25.652 Decl. +10.640
missing R.A. +25.652 Decl. +10.640 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.001 deg
ibex_rotate -o -r +25.652 -d +10.640 -w ibex-sun -t 2023-04-23T06:06:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.885941,+0.425461,+0.184638
which is R.A. +25.652 Decl. +10.640
missing R.A. +30.384 Decl. +12.381 (ibex-sun)
error is R.A. +4.732 Decl. +1.741
for a total 4.953 deg
There is no overlap with orbit 0603 commands.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503-902-8492
From: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Date: Monday, April 3, 2023 at 20:03
To: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, David Heirtzler <David.Heirtzler at unh.edu>, IBEX FDG Group <ADS-IBEX at l3harris.com>, IBEXOPS <IBEXOPS at gmail.com>, ISOC <isocops at lists.sr.unh.edu>, Ken Fairchild <fair-play at comcast.net>, Ken Fairchild (kwfairchild at gmail.com) <kwfairchild at gmail.com>, Kenneth Fairchild <Ken.Fairchild at unh.edu>, angoldconsulting <angoldconsulting at earthlink.net>, Paul Janzen <Paul.Janzen at mso.umt.edu>, Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>, 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: IBEX Orbit #604 Version 2 ATS Approval (09 - 18 Apr 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 #604. Please respond to this thread with comments and approvals.
Approvals are required by COB, 04 April 2023
Please note the following:
1. Apogee Sun Maneuver 04/13/2023 23:59:49
1. Perigee Sun Maneuver 04/18/2023 05:33:59
3. No Battery Balancing this orbit
4. Command Load Constraint Violation Report (CCVR)
IBEX_2023_099_o0604a_v002.ccvr
# Input files: 1
# IBEX_2023_099_o0604a_v002.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 2023/04/09 19:05:24 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2023/04/14 01:14:55 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
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