[Isocops] IBEX Orbit #561 ATS Approval ( 16 – 24 Mar 2022)
Carol Weaver
Carol.Weaver at unh.edu
Fri Mar 4 09:52:04 EST 2022
Hi all,
I have looked at the orbit 0561 ATS file, IBEX_2022_074_o0561a_v001.scr and I approve.
The constraint violations in IBEX_2022_074_o0561a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and having several commanding tracks close together. The violations are acceptable.
The PL commands in IBEX_2022_074_o0561a_v001.scr match those in the STF, IBEX_2022_074_o0561a_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_074_o0561a_v001.oef and as verified with ibex_orbit.
There are 2 star tracker outages this orbit. The first overlaps with orbit 560 and ends 4 days before apogee maneuver. The second lasts for ~43 hours around the apogee, but the maneuver takes place before the star tracker outage occurs.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit561_Contacts.txt for all contacts (5).
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 Sun maneuver at perigee of orbit 0560 left us pointing in safe directions for the orbit 0561 arc A ascending and descending sequences:
ibex_rotate -o -r +355.278 -d -2.047 -w ibex-sun -t 2022/03:16:03:46:46
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. +355.602 Decl. -1.921 (ibex-sun)
error is R.A. +0.324 Decl. +0.126
for a total 0.347 deg
ibex_rotate -o -r +355.278 -d -2.047 -w ibex-sun -t 2022/03:19:22:54:46
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. +359.182 Decl. -0.350 (ibex-sun)
error is R.A. +3.904 Decl. +1.697
for a total 4.256 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 0.999799,-0.012338,-0.015795 -w ibex-sun -t 2022/03:20:00:37:54
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999799,-0.012338,-0.015795
which is R.A. +359.293 Decl. -0.905
missing R.A. +359.248 Decl. -0.320 (ibex-sun)
error is R.A. +0.045 Decl. +0.585
for a total 0.587 deg
ibex_rotate -o -u 0.999799,-0.012338,-0.015795 -w ibex-sun -t 2022/03:20:02:13:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999799,-0.012338,-0.015795
which is R.A. +359.293 Decl. -0.905
missing R.A. +359.308 Decl. -0.293 (ibex-sun)
error is R.A. +0.015 Decl. +0.612
for a total 0.612 deg
ibex_rotate -o -u 0.999799,-0.012338,-0.015795 -w ibex-sun -t 2022/03:24:14:25:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999799,-0.012338,-0.015795
which is R.A. +359.293 Decl. -0.905
missing R.A. +3.301 Decl. +1.442 (ibex-sun)
error is R.A. +355.992 Decl. +2.348
for a total 4.645 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0562 apogee:
ibex_rotate -o -u 0.999527,0.030573,0.003438 -w ibex-sun -t 2022/03:24:18:29:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999527,+0.030573,+0.003438
which is R.A. +1.752 Decl. +0.197
missing R.A. +3.451 Decl. +1.500 (ibex-sun)
error is R.A. +1.699 Decl. +1.303
for a total 2.140 deg
ibex_rotate -o -u 0.999527,0.030573,0.003438 -w ibex-sun -t 2022-03-29T11:58:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.999527,+0.030573,+0.003438
which is R.A. +1.752 Decl. +0.197
missing R.A. +7.868 Decl. +3.407 (ibex-sun)
error is R.A. +6.116 Decl. +3.210
for a total 6.904 deg
There is no overlap with orbit 0560 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: Thursday, 2022-March-3 at 13:11
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 #561 ATS Approval ( 16 – 24 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 #561. Please respond to this thread with comments and approvals.
Approvals are required by COB, 05 Mar 2022
Please note the following:
1. Battery Balancing this orbit
Begin 2022/03/24 23:00:00– End 2022/03/25 00:30:00
1. Command Load Constraint Violation Report (CCVR)
IBEX_2022_074_o0561a_v001.ccvr
# Input files: 1
# IBEX_2022_074_o0561a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
The 2 IBX-CLC-006 constraint violations are acceptable.
IBX-CLC-006: Planned transmission at 2022/03/16 01:58:00 UTC - 2022/03/16
03:02:00 UTC is followed by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-006: Planned transmission at 2022/03/16 04:58:00 UTC - 2022/03/16
06:02:00 UTC is preceded by one or more additional transmissions
which, when combined, exceed the maximum transmission time of 5400
seconds within a 18000-second window (total planned transmission
time this window is 7680.000 seconds)
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2022/03/15 22:22:42 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2022/03/20 01:43:00 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 01D82EFD.487F5E60]
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