[Isocops] IBEX Orbit #544 ATS Approval (11 - 20 Oct, 2021)
Carol Weaver
Carol.Weaver at unh.edu
Thu Sep 30 15:36:55 EDT 2021
Hi all,
Angle at descending after apogee sun maneuver is 4.096 deg. Angle at apogee of 545 after perigee sun maneuver is 4.685 deg.
I have looked at the orbit 0544 ATS file, IBEX_2021_284_o0544a_v001.scr and I approve.
The constraint violations in IBEX_2021_284_o0544a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2021_284_o0544a_v001.scr match those in the STF, IBEX_2021_284_o0544a_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_2021_284_o0544a_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit lasting for ~6 days over both maneuvers.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit544_Contacts.txt for all contacts (3).
No Battery Balancing this orbit.
The Inertial maneuver at perigee of orbit 0543 left us pointing in safe directions for the orbit 0544 arc A ascending and descending sequences:
ibex_rotate -o -u -0.964813,-0.237517,-0.112787 -w ibex-sun -t 2021/10:11:11:52:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.964813,-0.237517,-0.112787
which is R.A. +193.830 Decl. -6.476
missing R.A. +196.707 Decl. -7.124 (ibex-sun)
error is R.A. +2.877 Decl. +0.648
for a total 2.929 deg
ibex_rotate -o -u -0.964813,-0.237517,-0.112787 -w ibex-sun -t 2021/10:15:11:26:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.964813,-0.237517,-0.112787
which is R.A. +193.830 Decl. -6.476
missing R.A. +200.290 Decl. -8.539 (ibex-sun)
error is R.A. +6.460 Decl. +2.063
for a total 6.728 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 +200.360 -d -8.565 -w ibex-sun -t 2021/10:15:13:14:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.927069,-0.344037,-0.148931
which is R.A. +200.360 Decl. -8.565
missing R.A. +200.360 Decl. -8.565 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +200.360 -d -8.565 -w ibex-sun -t 2021/10:15:14:44:39
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.927069,-0.344037,-0.148931
which is R.A. +200.360 Decl. -8.565
missing R.A. +200.418 Decl. -8.587 (ibex-sun)
error is R.A. +0.058 Decl. +0.022
for a total 0.061 deg
ibex_rotate -o -r +200.360 -d -8.565 -w ibex-sun -t 2021/10:19:14:00:45
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.927069,-0.344037,-0.148931
which is R.A. +200.360 Decl. -8.565
missing R.A. +204.221 Decl. -10.069 (ibex-sun)
error is R.A. +3.861 Decl. +1.504
for a total 4.096 deg
The Sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0545 apogee:
ibex_rotate -o -r +204.367 -d -10.131 -w ibex-sun -t 2021/10:19:17:33:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.896718,-0.406147,-0.175899
which is R.A. +204.367 Decl. -10.131
missing R.A. +204.367 Decl. -10.131 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.001 deg
ibex_rotate -o -r +204.367 -d -10.131 -w ibex-sun -t 2021-10-24T12:57:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.896718,-0.406147,-0.175899
which is R.A. +204.367 Decl. -10.131
missing R.A. +208.828 Decl. -11.795 (ibex-sun)
error is R.A. +4.461 Decl. +1.664
for a total 4.685 deg
There is no overlap with orbit 0543 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, 2021-September-29 at 13:08
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) <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>, Nigel Angold <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 #544 ATS Approval (11 - 20 Oct, 2021)
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 #544. Please respond to this thread with comments and approvals.
Approvals are required by 18:00, 01 Nov 2021
Please note the following:
1. Apogee Sun Maneuver - 2021/10:15:12:59:33
1. Perigee Sun Maneuver - 2021/10:19:17:18:25
1. No Battery Balancing this orbit
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_284_o0544a_v001.ccvr
# Input files: 1
# IBEX_2021_284_o0544a_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 2021/10/11 09:13:28 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/10/15 14:14:39 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 01D7B610.FE330F10]
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