[Isocops] IBEX Orbit #614 Version 2 ATS Approval (10 - 20 July 2023)

Wed Jun 28 07:21:05 EDT 2023

Hi all,
I have looked at the orbit 0614 ATS file, IBEX_2023_191_o0614a_v002.scr and I approve.

The constraint violations in IBEX_2023_191_o0614a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2023_191_o0614a_v002.scr match those in the STF, IBEX_2023_191_o0614a_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_191_o0614a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit.  It lasts for ~3 hours and starts ~13 hours after the perigee maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit614_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0613 left us pointing in safe directions for the orbit 0614 arc A ascending and descending sequences:

ibex_rotate -o -u -0.270005,0.886965,0.374688 -w ibex-sun -t 2023/07:11:06:19:57
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.270005,+0.886965,+0.374688
which is     R.A. +106.931 Decl. +22.005
missing      R.A. +109.916 Decl. +22.154 (ibex-sun)
error is     R.A.   +2.985 Decl.  +0.149
for a total  2.770 deg

ibex_rotate -o -u -0.270005,0.886965,0.374688 -w ibex-sun -t 2023/07:14:22:22:11
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.270005,+0.886965,+0.374688
which is     R.A. +106.931 Decl. +22.005
missing      R.A. +113.578 Decl. +21.679 (ibex-sun)
error is     R.A.   +6.647 Decl.  +0.326
for a total  6.178 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 -0.341957,0.866068,0.364682 -w ibex-sun -t 2023/07:15:00:05:19
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.341957,+0.866067,+0.364682
which is     R.A. +111.546 Decl. +21.388
missing      R.A. +113.652 Decl. +21.669 (ibex-sun)
error is     R.A.   +2.106 Decl.  +0.281
for a total  1.979 deg

ibex_rotate -o -u -0.341957,0.866068,0.364682 -w ibex-sun -t 2023/07:15:01:40:25
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.341957,+0.866067,+0.364682
which is     R.A. +111.546 Decl. +21.388
missing      R.A. +113.720 Decl. +21.660 (ibex-sun)
error is     R.A.   +2.174 Decl.  +0.272
for a total  2.040 deg

ibex_rotate -o -u -0.341957,0.866068,0.364682 -w ibex-sun -t 2023/07:19:14:20:18
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.341957,+0.866067,+0.364682
which is     R.A. +111.546 Decl. +21.388
missing      R.A. +118.408 Decl. +20.886 (ibex-sun)
error is     R.A.   +6.862 Decl.  +0.502
for a total  6.420 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0615 apogee:

 ibex_rotate -o -u -0.414354,0.838566,0.35372 -w ibex-sun -t 2023/07:19:17:04:51
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.414354,+0.838566,+0.353720
which is     R.A. +116.295 Decl. +20.715
missing      R.A. +118.522 Decl. +20.861 (ibex-sun)
error is     R.A.   +2.227 Decl.  +0.146
for a total  2.087 deg

ibex_rotate -o -u -0.414354,0.838566,0.35372 -w ibex-sun -t 2023-07-24T14:14:51
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.414354,+0.838566,+0.353720
which is     R.A. +116.295 Decl. +20.715
missing      R.A. +123.265 Decl. +19.941 (ibex-sun)
error is     R.A.   +6.970 Decl.  +0.774
for a total  6.581 deg

There is no overlap with orbit 0613 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: Tuesday, June 27, 2023 at 14:07
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 <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 #614 Version 2 ATS Approval (10 - 20 July 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,

1.           Attached are the planning files for Orbit #614 Version 2. The ATS has been updated to version #2. The Battery balancing commands have been removed from this orbit. Since we did battery balancing on the last three orbits it was decided to skip this orbit and resume battery balancing on the next orbit. Please respond to this thread with comments and approvals. Approvals are required by COB, 30 June 2023

Please note the following:

2.        No Battery Balancing this Orbit.

3.        Command Load Constraint Violation Report (CCVR)

IBEX_2023_191_o0614a_v001.ccvr

# Input files:         1

#   IBEX_2023_191_o0614a_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 2023/07/11 04:25:40 UTC

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

             transition to science mode at 2023/07/15 01:10:25 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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