[Isocops] IBEX Orbit #621 ATS Approval ( Sept 12 - 21, 2023)
Carol Weaver
Carol.Weaver at unh.edu
Thu Aug 31 10:36:47 EDT 2023
Hi all,
I have looked at the orbit 0621 ATS file, IBEX_2023_255_o0621a_v001.scr and I approve.
The constraint violations in IBEX_2023_255_o0621a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2023_255_o0621a_v001.scr match those in the STF, IBEX_2023_255_o0621a_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_255_o0621a_v001.oef and as verified with ibex_orbit.
No star tracker outage this orbit.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit621_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 0620 left us pointing in safe directions for the orbit 0621 arc A ascending and descending sequences:
ibex_rotate -o -u -0.971868,0.219519,0.085347 -w ibex-sun -t 2023/09:12:14:31:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.971868,+0.219519,+0.085347
which is R.A. +167.272 Decl. +4.896
missing R.A. +170.134 Decl. +4.227 (ibex-sun)
error is R.A. +2.862 Decl. +0.669
for a total 2.930 deg
ibex_rotate -o -u -0.971868,0.219519,0.085347 -w ibex-sun -t 2023/09:16:03:08:13
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.971868,+0.219519,+0.085347
which is R.A. +167.272 Decl. +4.896
missing R.A. +173.200 Decl. +2.948 (ibex-sun)
error is R.A. +5.928 Decl. +1.948
for a total 6.227 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 -0.987011,0.151052,0.054706 -w ibex-sun -t 2023/09:16:04:51:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.987011,+0.151052,+0.054706
which is R.A. +171.299 Decl. +3.136
missing R.A. +173.264 Decl. +2.922 (ibex-sun)
error is R.A. +1.965 Decl. +0.214
for a total 1.974 deg
ibex_rotate -o -u -0.987011,0.151052,0.054706 -w ibex-sun -t 2023/09:16:06:26:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.987011,+0.151052,+0.054706
which is R.A. +171.299 Decl. +3.136
missing R.A. +173.323 Decl. +2.897 (ibex-sun)
error is R.A. +2.024 Decl. +0.238
for a total 2.036 deg
ibex_rotate -o -u -0.987011,0.151052,0.054706 -w ibex-sun -t 2023/09:20:13:32:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.987011,+0.151052,+0.054706
which is R.A. +171.299 Decl. +3.136
missing R.A. +177.267 Decl. +1.203 (ibex-sun)
error is R.A. +5.968 Decl. +1.933
for a total 6.269 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0622 apogee:
ibex_rotate -o -u -0.996242,0.082624,0.025985 -w ibex-sun -t 2023/09:20:15:59:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.996242,+0.082624,+0.025985
which is R.A. +175.259 Decl. +1.489
missing R.A. +177.364 Decl. +1.157 (ibex-sun)
error is R.A. +2.105 Decl. +0.332
for a total 2.130 deg
ibex_rotate -o -u -0.996242,0.082624,0.025985 -w ibex-sun -t 2023-09-25T11:42:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.996242,+0.082624,+0.025985
which is R.A. +175.259 Decl. +1.489
missing R.A. +181.601 Decl. -0.678 (ibex-sun)
error is R.A. +6.342 Decl. +2.167
for a total 6.701 deg
There is no overlap with orbit 0620 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: Wednesday, August 30, 2023 at 12:48
To: 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 <angoldconsulting at earthlink.net>, Paul.Janzen at mso.umt.edu <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 #621 ATS Approval ( Sept 12 - 21, 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 #621 Please respond to this thread with comments and approvals. Approvals are required by 02 Sept 2023 @18:00 GMT
Please note the following:
1. Battery Balancing this Orbit.
Begin 2023/09/21 01:00:00 – End 2023/09/21 02:30:00
2. Command Load Constraint Violation Report (CCVR)
IBEX_2023_255_o0621a_v001.ccvr
# Input files: 1
# IBEX_2023_255_o0621a_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 2023/09/12 12:39:43 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2023/09/16 05:56:27 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry at ngc.com<mailto:timothy.perry at ngc.com>
Office (703) 406-5976
Cell (301) 606-1430
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