[Isocops] IBEX Orbit #652 ATS Approval (June 20 - 29, 2024)

Fri Jun 7 16:32:01 EDT 2024

Hi all,
I have looked at the orbit 0652 ATS file, IBEX_2024_171_o0652a_v001.scr and I approve.

The constraint violations in IBEX_2024_171_o0652a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_171_o0652a_v001.scr match those in the STF, IBEX_2024_171_o0652a_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_171_o0652a_v001.oef and as verified with ibex_orbit.

There are 2 star tracker outages this orbit. The first outage begins at 2024-06-19 19:14:00 and lasts for 22.1 hours. The other outage begins at 2024-06-28 16:29:32 and lasts for 4.2 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit652_Contacts.txt for all contacts (2).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0651 left us pointing in safe directions for the orbit 0652 arc A ascending and descending sequences:

 ibex_rotate -o -u 0.063567,0.919187,0.388658 -w ibex-sun -t 2024/06:20:07:09:38
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.063567,+0.919187,+0.388658
which is     R.A.  +86.044 Decl. +22.871
missing      R.A.  +89.006 Decl. +23.415 (ibex-sun)
error is     R.A.   +2.962 Decl.  +0.544
for a total  2.778 deg

ibex_rotate -o -u 0.063567,0.919187,0.388658 -w ibex-sun -t 2024/06:23:17:49:04
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.063567,+0.919187,+0.388658
which is     R.A.  +86.044 Decl. +22.871
missing      R.A.  +92.550 Decl. +23.433 (ibex-sun)
error is     R.A.   +6.506 Decl.  +0.562
for a total  6.008 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 -0.008844,0.921299,0.388754 -w ibex-sun -t 2024/06:23:19:32:12
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.008844,+0.921299,+0.388754
which is     R.A.  +90.550 Decl. +22.877
missing      R.A.  +92.625 Decl. +23.432 (ibex-sun)
error is     R.A.   +2.075 Decl.  +0.555
for a total  1.987 deg

ibex_rotate -o -u -0.008844,0.921299,0.388754 -w ibex-sun -t 2024/06:23:21:07:18
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.008844,+0.921299,+0.388754
which is     R.A.  +90.550 Decl. +22.877
missing      R.A.  +92.695 Decl. +23.432 (ibex-sun)
error is     R.A.   +2.145 Decl.  +0.555
for a total  2.049 deg

ibex_rotate -o -u -0.008844,0.921299,0.388754 -w ibex-sun -t 2024/06:28:04:03:08
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.008844,+0.921299,+0.388754
which is     R.A.  +90.550 Decl. +22.877
missing      R.A.  +97.248 Decl. +23.287 (ibex-sun)
error is     R.A.   +6.698 Decl.  +0.410
for a total  6.175 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0653 apogee:

ibex_rotate -o -u -0.083706,0.917824,0.388063 -w ibex-sun -t 2024/06:28:06:08:40
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.083706,+0.917824,+0.388063
which is     R.A.  +95.211 Decl. +22.834
missing      R.A.  +97.339 Decl. +23.280 (ibex-sun)
error is     R.A.   +2.128 Decl.  +0.446
for a total  2.008 deg

ibex_rotate -o -u -0.083706,0.917824,0.388063 -w ibex-sun -t 2024-07-03T04:37:32
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.083706,+0.917824,+0.388063
which is     R.A.  +95.211 Decl. +22.834
missing      R.A. +102.336 Decl. +22.975 (ibex-sun)
error is     R.A.   +7.125 Decl.  +0.141
for a total  6.564 deg

There is no overlap with orbit 0651 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, June 6, 2024 at 14:02
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 #652 ATS Approval (June 20 - 29, 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 #652. Please respond to this thread with comments and approvals. Approvals for the Orbit 652 ATS are required by 2000 , 10 June 2024.

Please note the following:

No Battery Balancing

Command Load Constraint Violation Report (CCVR)

IBEX_2024_171_o0652a_v001.ccvr

# Input files:         1

#   IBEX_2024_171_o0652a_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 2024/06/20 05:52:21 UTC

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

             transition to science mode at 2024/06/23 20:37:18 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
IBEX MOC (703)404-7470
Cell (301) 606-1430

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