[Isocops] IBEX Orbit #545 ATS Approval (20 – 29 Oct, 2021)
Carol Weaver
Carol.Weaver at unh.edu
Fri Oct 8 12:07:55 EDT 2021
Hi all,
The angle at descending after the apogee sun maneuver is 4.164 deg.
I have looked at the orbit 0545 ATS file, IBEX_2021_292_o0545a_v001.scr and I approve.
The constraint violations in IBEX_2021_292_o0545a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.
The PL commands in IBEX_2021_292_o0545a_v001.scr match those in the STF, IBEX_2021_292_o0545a_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_292_o0545a_v001.oef and as verified with ibex_orbit.
There is 1 star tracker outage this orbit ending shortly before the apogee sun maneuver.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit545_Contacts.txt for all contacts (3).
Battery Balancing is 90 minutes long, more than 2 hours away from payload descending macros, and more than 1 hour away from maneuver.
The Sun maneuver at perigee of orbit 0544 left us pointing in safe directions for the orbit 0545 arc A ascending and descending sequences:
ibex_rotate -o -r +204.367 -d -10.131 -w ibex-sun -t 2021/10:20:09:16:04
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. +204.991 Decl. -10.398 (ibex-sun)
error is R.A. +0.624 Decl. +0.267
for a total 0.669 deg
ibex_rotate -o -r +204.367 -d -10.131 -w ibex-sun -t 2021/10:24:11:24:12
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. +208.767 Decl. -11.773 (ibex-sun)
error is R.A. +4.400 Decl. +1.642
for a total 4.621 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 +208.838 -d -11.798 -w ibex-sun -t 2021/10:24:13:12:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.857481,-0.472145,-0.204462
which is R.A. +208.838 Decl. -11.798
missing R.A. +208.838 Decl. -11.798 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +208.838 -d -11.798 -w ibex-sun -t 2021/10:24:14:42:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.857481,-0.472145,-0.204462
which is R.A. +208.838 Decl. -11.798
missing R.A. +208.897 Decl. -11.819 (ibex-sun)
error is R.A. +0.059 Decl. +0.021
for a total 0.062 deg
ibex_rotate -o -r +208.838 -d -11.798 -w ibex-sun -t 2021/10:28:15:28:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.857481,-0.472145,-0.204462
which is R.A. +208.838 Decl. -11.798
missing R.A. +212.848 Decl. -13.215 (ibex-sun)
error is R.A. +4.010 Decl. +1.417
for a total 4.164 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0546 apogee:
ibex_rotate -o -u -0.837958,-0.497069,-0.225274 -w ibex-sun -t 2021/10:28:18:45:35
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.837958,-0.497069,-0.225274
which is R.A. +210.676 Decl. -13.019
missing R.A. +212.988 Decl. -13.269 (ibex-sun)
error is R.A. +2.312 Decl. +0.250
for a total 2.265 deg
ibex_rotate -o -u -0.837958,-0.497069,-0.225274 -w ibex-sun -t 2021-11-02T12:57:02
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.837958,-0.497069,-0.225274
which is R.A. +210.676 Decl. -13.019
missing R.A. +217.551 Decl. -14.788 (ibex-sun)
error is R.A. +6.875 Decl. +1.769
for a total 6.903 deg
There is no overlap with orbit 0544 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-October-6 at 19:27
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 #545 ATS Approval (20 – 29 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 #545. Please respond to this thread with comments and approvals.
Approvals are required by COB, 09 Oct 2021
Please note the following:
1. Apogee Sun Maneuver - 2021/10:24:12:57:20
1. No Battery Balancing this orbit
Begin 2021/10/29 01:00:00– End 2021/10/29 02:30:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2021_292_o0545a_v001.ccvr
# Input files: 1
# IBEX_2021_292_o0545a_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 2021/10/20 06:32:57 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2021/10/24 14:12:26 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 01D7BC3D.1EB11E30]
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