[Isocops] IBEX Orbit #560 ATS Approval (06 - 16 Mar 2022)
Carol Weaver
Carol.Weaver at unh.edu
Thu Feb 24 13:35:00 EST 2022
Hi all,
The angle at Orbit 561 apogee after the perigee sun maneuver is 4.736 deg.
I have looked at the orbit 0560 ATS file, IBEX_2022_065_o0560a_v001.scr and I approve.
The constraint violations in IBEX_2022_065_o0560a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2022_065_o0560a_v001.scr match those in the STF, IBEX_2022_065_o0560a_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_2022_065_o0560a_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outages this orbit around the perigee maneuver that lasts for about 10 hours.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit560_Contacts.txt for all contacts (2).
Battery Balancing is 90 minutes long and more than 2 hours away from payload descending macros. It is ~30 minutes from the maneuver instead of 1 hour, but based on guidance from Ryan Tyler, the balancing needs to only be at least 15 minutes from a maneuver so this is acceptable.
The Inertial maneuver at perigee of orbit 0559 left us pointing in safe directions for the orbit 0560 arc A ascending and descending sequences:
ibex_rotate -o -u 0.973273,-0.206485,-0.100518 -w ibex-sun -t 2022/03:06:20:12:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.973273,-0.206485,-0.100518
which is R.A. +348.022 Decl. -5.769
missing R.A. +347.030 Decl. -5.574 (ibex-sun)
error is R.A. +0.992 Decl. +0.195
for a total 1.006 deg
ibex_rotate -o -u 0.973273,-0.206485,-0.100518 -w ibex-sun -t 2022/03:10:17:09:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.973273,-0.206485,-0.100518
which is R.A. +348.022 Decl. -5.769
missing R.A. +350.725 Decl. -3.991 (ibex-sun)
error is R.A. +2.703 Decl. +1.778
for a total 3.227 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 0.988928,-0.13225,-0.067319 -w ibex-sun -t 2022/03:10:18:52:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.988928,-0.132250,-0.067319
which is R.A. +352.383 Decl. -3.860
missing R.A. +350.791 Decl. -3.962 (ibex-sun)
error is R.A. +1.592 Decl. +0.102
for a total 1.592 deg
ibex_rotate -o -u 0.988928,-0.13225,-0.067319 -w ibex-sun -t 2022/03:10:20:27:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.988928,-0.132250,-0.067319
which is R.A. +352.383 Decl. -3.860
missing R.A. +350.852 Decl. -3.935 (ibex-sun)
error is R.A. +1.531 Decl. +0.075
for a total 1.530 deg
ibex_rotate -o -u 0.988928,-0.13225,-0.067319 -w ibex-sun -t 2022/03:15:13:18:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.988928,-0.132250,-0.067319
which is R.A. +352.383 Decl. -3.860
missing R.A. +355.042 Decl. -2.137 (ibex-sun)
error is R.A. +2.659 Decl. +1.723
for a total 3.165 deg
The Sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0561 apogee:
ibex_rotate -o -r +355.278 -d -2.047 -w ibex-sun -t 2022/03:15:19:31:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.995970,-0.082269,-0.035719
which is R.A. +355.278 Decl. -2.047
missing R.A. +355.278 Decl. -2.047 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +355.278 -d -2.047 -w ibex-sun -t 2022-03-20T10:25:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.995970,-0.082269,-0.035719
which is R.A. +355.278 Decl. -2.047
missing R.A. +359.620 Decl. -0.152 (ibex-sun)
error is R.A. +4.342 Decl. +1.895
for a total 4.736 deg
There is no overlap with orbit 0559 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, 2022-February-21 at 11:53
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>, fair-play at comcast.net <fair-play at comcast.net>, 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>, 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 #560 ATS Approval (06 - 16 Mar 2022)
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 #560. Please respond to this thread with comments and approvals.
Approvals are required by COB, 24 Feb 2022
Please note the following:
1. Perigee Sun Maneuver - 2022/03/15 19:16:45
1. Battery Balancing this orbit
Begin 2022/03/15 20:00:00– End 2022/03/15 21:30:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2022_065_o0560a_v001.ccvr
# Input files: 1
# IBEX_2022_065_o0560a_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 2022/03/06 15:14:18 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2022/03/10 19:57:39 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry at ngc.com
Office (703) 406-5976
Cell (301) 606-1430
[cid:image001.png at 01D82718.82CD9880]
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