[Isocops] IBEX Orbit #618 ATS Approval ( 16 – 25 Aug 2023)

Fri Aug 4 15:54:34 EDT 2023

Hi all,
I have looked at the orbit 0618 ATS file, IBEX_2023_228_o0618a_v001.scr and I approve.

The constraint violations in IBEX_2023_228_o0618a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2023_228_o0618a_v001.scr match those in the STF, IBEX_2023_228_o0618a_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_228_o0618a_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_Orbit618_Contacts.txt for all contacts (4).

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 0617 left us pointing in safe directions for the orbit 0618 arc A ascending and descending sequences:

ibex_rotate -o -u -0.770887,0.58794,0.24507  -w ibex-sun -t 2023/08:16:16:23:12
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. +145.569 Decl. +13.752 (ibex-sun)
error is     R.A.   +2.901 Decl.  +0.434
for a total  2.848 deg

ibex_rotate -o -u -0.770887,0.58794,0.24507  -w ibex-sun -t 2023/08:20:05:47:09
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. +148.783 Decl. +12.673 (ibex-sun)
error is     R.A.   +6.115 Decl.  +1.513
for a total  6.137 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 -0.81653,0.533529,0.22051 -w ibex-sun -t 2023/08:20:07:30:17
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.816530,+0.533529,+0.220510
which is     R.A. +146.839 Decl. +12.739
missing      R.A. +148.850 Decl. +12.651 (ibex-sun)
error is     R.A.   +2.011 Decl.  +0.088
for a total  1.964 deg

ibex_rotate -o -u -0.81653,0.533529,0.22051 -w ibex-sun -t 2023/08:20:09:05:23
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.816530,+0.533529,+0.220510
which is     R.A. +146.839 Decl. +12.739
missing      R.A. +148.912 Decl. +12.630 (ibex-sun)
error is     R.A.   +2.073 Decl.  +0.109
for a total  2.025 deg

ibex_rotate -o -u -0.81653,0.533529,0.22051 -w ibex-sun -t 2023/08:24:17:12:26
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.816530,+0.533529,+0.220510
which is     R.A. +146.839 Decl. +12.739
missing      R.A. +153.037 Decl. +11.137 (ibex-sun)
error is     R.A.   +6.198 Decl.  +1.602
for a total  6.271 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0619 apogee:

ibex_rotate -o -u -0.857524,0.47551,0.196323 -w ibex-sun -t 2023/08:24:19:50:31
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.857524,+0.475510,+0.196323
which is     R.A. +150.991 Decl. +11.322
missing      R.A. +153.141 Decl. +11.094 (ibex-sun)
error is     R.A.   +2.150 Decl.  +0.228
for a total  2.121 deg

ibex_rotate -o -u -0.857524,0.47551,0.196323 -w ibex-sun -t 2023-08-29T15:13:56
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  -0.857524,+0.475510,+0.196323
which is     R.A. +150.991 Decl. +11.322
missing      R.A. +157.415 Decl.  +9.469 (ibex-sun)
error is     R.A.   +6.424 Decl.  +1.853
for a total  6.585 deg

There is no overlap with orbit 0617 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, August 3, 2023 at 06:09
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 #618 ATS Approval ( 16 – 25 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 #618. Please respond to this thread with comments and approvals. Approvals are required by COB, 05 Aug 2023

Please note the following:

1.        Battery Balancing this Orbit.

Begin 2023/08/25 04:00:00– End 2023/08/25 05:30:00

2.        Command Load Constraint Violation Report (CCVR)

IBEX_2023_228_o0618a_v001.ccvr

# Input files:         1

#   IBEX_2023_228_o0618a_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 2023/08/16 14:23:28 UTC

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

             transition to science mode at 2023/08/20 08:35:23 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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