[Isocops] IBEX Orbit #667 ATS Approval (November 04 - 13, 2024)

Fri Oct 25 09:07:46 EDT 2024

Hi all,
The angle at descending after the sun procession maneuver is 4.070 deg.

I have looked at the orbit 0667 ATS file, IBEX_2024_308_o0667a_v001.scr and I approve.

The constraint violations in IBEX_2024_308_0667_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_308_o0667a_v001.scr match those in the STF, IBEX_2024_308_o0667a_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_2024_308_o0667a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins at 2024-11-05 02:28:27 and lasts for 110.7 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit667_Contacts.txt for all contacts (3).

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 Inertial maneuver at perigee of orbit 0666 left us pointing in safe directions for the orbit 0667 arc A ascending and descending sequences:

 ibex_rotate -o -u -0.775356,-0.575809,-0.259358 -w ibex-sun -t 2024/11:04:09:39:13
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.775356,-0.575809,-0.259358
which is     R.A. +216.599 Decl. -15.032
missing      R.A. +219.709 Decl. -15.498 (ibex-sun)
error is     R.A.   +3.110 Decl.  +0.466
for a total  3.037 deg

ibex_rotate -o -u -0.775356,-0.575809,-0.259358 -w ibex-sun -t 2024/11:08:10:11:46
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.775356,-0.575809,-0.259358
which is     R.A. +216.599 Decl. -15.032
missing      R.A. +223.680 Decl. -16.642 (ibex-sun)
error is     R.A.   +7.081 Decl.  +1.610
for a total  7.000 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 +223.757 -d -16.663   -w ibex-sun -t 2024/11:08:12:03:12
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.691949,-0.662559,-0.286742
which is     R.A. +223.757 Decl. -16.663
missing      R.A. +223.757 Decl. -16.663 (ibex-sun)
error is     R.A.   +0.000 Decl.  +0.000
for a total  0.000 deg

ibex_rotate -o -r +223.757 -d -16.663 -w ibex-sun -t 2024/11:08:13:30:00
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.691949,-0.662559,-0.286742
which is     R.A. +223.757 Decl. -16.663
missing      R.A. +223.817 Decl. -16.680 (ibex-sun)
error is     R.A.   +0.060 Decl.  +0.017
for a total  0.060 deg

ibex_rotate -o -r +223.757 -d -16.663  -w ibex-sun -t 2024/11:12:13:34:20
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.691949,-0.662559,-0.286742
which is     R.A. +223.757 Decl. -16.663
missing      R.A. +227.850 Decl. -17.797 (ibex-sun)
error is     R.A.   +4.093 Decl.  +1.134
for a total  4.070 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0668 apogee:

ibex_rotate -o -u -0.664446,-0.682073,-0.305429 -w ibex-sun -t 2024/11:12:15:32:37
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.664446,-0.682073,-0.305429
which is     R.A. +225.750 Decl. -17.784
missing      R.A. +227.937 Decl. -17.823 (ibex-sun)
error is     R.A.   +2.187 Decl.  +0.039
for a total  2.082 deg

ibex_rotate -o -u -0.664446,-0.682073,-0.305429 -w ibex-sun -t 2024-11-17T17:48:47
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.664446,-0.682073,-0.305429
which is     R.A. +225.750 Decl. -17.784
missing      R.A. +233.200 Decl. -19.116 (ibex-sun)
error is     R.A.   +7.450 Decl.  +1.332
for a total  7.191 deg

There is no overlap with orbit 0666 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, October 21, 2024 at 10:28
To: Carol Weaver <carol.weaver at unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin at ngc.com>, Coca Gonzales, Andrea [US] (SP) <Andrea.CocaGonzales 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 #667 ATS Approval (November 04 - 13, 2024)
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 #667. Please respond to this thread with comments and approvals. Approvals for the Orbit 667 ATS are required by COB, 24 October 2024.

Please note the following:

Battery Balancing

Eclipse Flag True: 2024/11/13 01:00:00

Eclipse Flag False: 2024/11/13 02:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2024_308_0667_v001.ccvr

# Input files:         1

#   IBEX_2024_308_o0667a_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 2024/11/04 08:23:15 UTC

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

             transition to science mode at 2024/11/08 13:00:00 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
IBEX MOC (703)404-7470
Cell (301) 606-1430

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