[Isocops] IBEX Orbit #626 ATS Approval ( Oct 26 – Nov 5, 2023)

Tue Oct 17 17:09:53 EDT 2023

Hi all,
I have looked at the orbit 0626 ATS file, IBEX_2023_299_o0626a_v001.scr and I approve.

The constraint violations in IBEX_2023_290_o0626a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2023_299_o0626a_v001.scr match those in the STF, IBEX_2023_299_o0626a_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_299_o0626a_v001.oef and as verified with ibex_orbit.

There are no star tracker outages this orbit.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit626_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The Sun maneuver at perigee of orbit 0625 left us pointing in safe directions for the orbit 0626 arc A ascending and descending sequences:

ibex_rotate -o -r +210.220 -d -12.291  -w ibex-sun -t 2023-10-26T10:32:49
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.844293,-0.491785,-0.212877
which is     R.A. +210.220 Decl. -12.291
missing      R.A. +210.220 Decl. -12.291 (ibex-sun)
error is     R.A.   +0.000 Decl.  +0.000
for a total  0.001 deg

ibex_rotate -o -r +210.220 -d -12.291 -w ibex-sun -t 2023/10:27:07:54:05
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.844293,-0.491785,-0.212877
which is     R.A. +210.220 Decl. -12.291
missing      R.A. +211.109 Decl. -12.646 (ibex-sun)
error is     R.A.   +0.889 Decl.  +0.355
for a total  0.938 deg

ibex_rotate -o -r +210.220 -d -12.291 -w ibex-sun -t 2023/10:31:05:33:04
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.844293,-0.491785,-0.212877
which is     R.A. +210.220 Decl. -12.291
missing      R.A. +214.821 Decl. -13.888 (ibex-sun)
error is     R.A.   +4.601 Decl.  +1.597
for a total  4.757 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 -0.81904,-0.52241,-0.237194 -w ibex-sun -t 2023/10:31:07:16:12
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.819040,-0.522410,-0.237194
which is     R.A. +212.531 Decl. -13.721
missing      R.A. +214.890 Decl. -13.910 (ibex-sun)
error is     R.A.   +2.359 Decl.  +0.189
for a total  2.298 deg

ibex_rotate -o -u -0.81904,-0.52241,-0.237194 -w ibex-sun -t 2023/10:31:08:51:18
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.819040,-0.522410,-0.237194
which is     R.A. +212.531 Decl. -13.721
missing      R.A. +214.953 Decl. -13.931 (ibex-sun)
error is     R.A.   +2.422 Decl.  +0.210
for a total  2.362 deg

ibex_rotate -o -u -0.81904,-0.52241,-0.237194 -w ibex-sun -t 2023/11:04:11:56:12
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.819040,-0.522410,-0.237194
which is     R.A. +212.531 Decl. -13.721
missing      R.A. +219.019 Decl. -15.245 (ibex-sun)
error is     R.A.   +6.4

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0627 apogee:

ibex_rotate -o -u -0.771645,-0.579957,-0.261178 -w ibex-sun -t 2023/11:04:14:13:51
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.771645,-0.579957,-0.261178
which is     R.A. +216.928 Decl. -15.140
missing      R.A. +219.118 Decl. -15.280 (ibex-sun)
error is     R.A.   +2.190 Decl.  +0.140
for a total  2.118 deg

ibex_rotate -o -u -0.771645,-0.579957,-0.261178 -w ibex-sun -t 2023-11-09T11:55:17
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.771645,-0.579957,-0.261178
which is     R.A. +216.928 Decl. -15.140
missing      R.A. +223.997 Decl. -16.740 (ibex-sun)
error is     R.A.   +7.069 Decl.  +1.600
for a total  6.982 deg

There is no overlap with orbit 0625 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: Friday, October 13, 2023 at 14:04
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 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 #626 ATS Approval ( Oct 26 – Nov 5, 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 #626. Please respond to this thread with comments and approvals. Approvals are required by COB 16 Oct 2023

Please note the following:

1.        The ATS I will hold off on up-linking it until later into orbit# 625, just in case we decide to change the maneuvers to sun maneuvers.

2.        Perigee Eclipse

# 2023-11-04T20:48:55.421Z,EclipseEntry,moderate:true,long:false,orbit:626

# 2023-11-04T21:48:25.246Z,EclipseExit,moderate:true,long:false,orbit:626 .

Eclipse Flag -> True 2023/11:04:19:00:00

Eclipse Flag -> False 2023/11:04:22:05:00

3.        Command Load Constraint Violation Report (CCVR)

IBEX_2023_290_o0626a_v001.ccvr

# Input files:         1

#   IBEX_2023_299_o0626a_v001.scr

==========================

HARD CONSTRAINT VIOLATIONS

==========================

NO VIOLATIONS.

==========================

SOFT CONSTRAINT VIOLATIONS

==========================

IBX-CLC-015: Battery charge falls below minimum from 2023/11/04 21:54:00 UTC -

             2023/11/05 08:02:00 UTC. Lowest charge level is 2006.577785

             watt-minutes during this interval.

IBX-CLC-016: No command to enable spin pulse protection was found after

             transition to science mode at 2023/10/27 06:18:06 UTC

IBX-CLC-016: No command to enable spin pulse protection was found after

             transition to science mode at 2023/10/31 08:21:18 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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