[Isocops] IBEX Orbit #617 ATS Approval ( 07 - 16 Aug 2023)

Fri Jul 28 07:16:11 EDT 2023

Hi all,
I have looked at the orbit 0617 ATS file, IBEX_2023_219_o0617a_v001.scr and I approve.

The constraint violations in IBEX_2023_219_o0617a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2023_219_o0617a_v001.scr match those in the STF, IBEX_2023_219_o0617a_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_219_o0617a_v001.oef and as verified with ibex_orbit.

No star tracker outage this orbit.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit617_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0616 left us pointing in safe directions for the orbit 0617 arc A ascending and descending sequences:

ibex_rotate -o -u -0.665097,0.68868,0.288731 -w ibex-sun -t 2023/08:07:13:27:49
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.665097,+0.688680,+0.288731
which is     R.A. +134.002 Decl. +16.782
missing      R.A. +136.940 Decl. +16.467 (ibex-sun)
error is     R.A.   +2.938 Decl.  +0.315
for a total  2.833 deg

ibex_rotate -o -u -0.665097,0.68868,0.288731 -w ibex-sun -t 2023/08:11:04:09:55
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.665097,+0.688680,+0.288731
which is     R.A. +134.002 Decl. +16.782
missing      R.A. +140.284 Decl. +15.494 (ibex-sun)
error is     R.A.   +6.282 Decl.  +1.288
for a total  6.170 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 -0.719652,0.640917,0.26707 -w ibex-sun -t 2023/08:11:05:53:03
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.719652,+0.640917,+0.267070
which is     R.A. +138.312 Decl. +15.490
missing      R.A. +140.352 Decl. +15.474 (ibex-sun)
error is     R.A.   +2.040 Decl.  +0.016
for a total  1.966 deg

ibex_rotate -o -u -0.719652,0.640917,0.26707 -w ibex-sun -t 2023/08:11:07:28:09
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.719652,+0.640917,+0.267070
which is     R.A. +138.312 Decl. +15.490
missing      R.A. +140.415 Decl. +15.455 (ibex-sun)
error is     R.A.   +2.103 Decl.  +0.035
for a total  2.027 deg

ibex_rotate -o -u -0.719652,0.640917,0.26707 -w ibex-sun -t 2023/08:15:18:27:10
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.719652,+0.640917,+0.267070
which is     R.A. +138.312 Decl. +15.490
missing      R.A. +144.743 Decl. +14.065 (ibex-sun)
error is     R.A.   +6.431 Decl.  +1.425
for a total  6.379 deg
The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0618 apogee:

ibex_rotate -o -u -0.770887,0.58794,0.24507 -w ibex-sun -t 2023/08:15:21:14:05
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.770887,+0.587940,+0.245070
which is     R.A. +142.668 Decl. +14.186
missing      R.A. +144.854 Decl. +14.023 (ibex-sun)
error is     R.A.   +2.186 Decl.  +0.163
for a total  2.126 deg

ibex_rotate -o -u -0.770887,0.58794,0.24507 -w ibex-sun -t 2023-08-20T17:18:15
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.770887,+0.587940,+0.245070
which is     R.A. +142.668 Decl. +14.186
missing      R.A. +149.231 Decl. +12.521 (ibex-sun)
error is     R.A.   +6.563 Decl.  +1.665
for a total  6.599 deg

There is no overlap with orbit 0616 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, July 25, 2023 at 17:06
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 #617 ATS Approval ( 07 - 16 Aug 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 #617. Please respond to this thread with comments and approvals. Approvals are required by COB, 27 July 2023

Please note the following:

1.        No Battery Balancing this Orbit.

2.        Command Load Constraint Violation Report (CCVR)

IBEX_2023_219_o0617a_v001.ccvr

# Input files:         1

#   IBEX_2023_219_o0617a_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 2023/08/07 11:32:55 UTC

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

             transition to science mode at 2023/08/11 06:58:09 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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