[Isocops] IBEX Orbit #646 ATS Approval (April 27 – May 06, 2024)

Tue Apr 16 15:47:45 EDT 2024

Hi all,
I have looked at the orbit 0646 ATS file, IBEX_2024_117_o0646a_v001.scr and I approve.

The constraint violations in IBEX_2024_117_o0646a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_117_o0646a_v001.scr match those in the STF, IBEX_2024_117_o0646a_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_117_o0646a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins at 2024-05-05 16:04:18 and lasts for 6.3 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit646_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0645 left us pointing in safe directions for the orbit 0646 arc A ascending and descending sequences:

ibex_rotate -o -u 0.823456,0.524094,0.21736 -w ibex-sun -t 2024/04:27:10:18:01
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.823456,+0.524094,+0.217360
which is     R.A.  +32.475 Decl. +12.554
missing      R.A.  +34.940 Decl. +13.922 (ibex-sun)
error is     R.A.   +2.465 Decl.  +1.368
for a total  2.762 deg

ibex_rotate -o -u 0.823456,0.524094,0.21736 -w ibex-sun -t 2024/04:30:22:25:52
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.823456,+0.524094,+0.217360
which is     R.A.  +32.475 Decl. +12.554
missing      R.A.  +38.318 Decl. +15.058 (ibex-sun)
error is     R.A.   +5.843 Decl.  +2.504
for a total  6.201 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 0.77882,0.579331,0.240448 -w ibex-sun -t 2024/05:01:00:09:00
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.778820,+0.579331,+0.240448
which is     R.A.  +36.644 Decl. +13.913
missing      R.A.  +38.387 Decl. +15.081 (ibex-sun)
error is     R.A.   +1.743 Decl.  +1.168
for a total  2.052 deg

ibex_rotate -o -u 0.77882,0.579331,0.240448 -w ibex-sun -t 2024/05:01:01:44:06
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.778820,+0.579331,+0.240448
which is     R.A.  +36.644 Decl. +13.913
missing      R.A.  +38.451 Decl. +15.102 (ibex-sun)
error is     R.A.   +1.807 Decl.  +1.189
for a total  2.115 deg

ibex_rotate -o -u 0.77882,0.579331,0.240448 -w ibex-sun -t 2024/05:05:09:03:36
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.778820,+0.579331,+0.240448
which is     R.A.  +36.644 Decl. +13.913
missing      R.A.  +42.589 Decl. +16.369 (ibex-sun)
error is     R.A.   +5.945 Decl.  +2.456
for a total  6.241 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0647 apogee:

 ibex_rotate -o -u 0.728395,0.632159,0.264227 -w ibex-sun -t 2024/05:05:11:11:01
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.728395,+0.632159,+0.264227
which is     R.A.  +40.954 Decl. +15.321
missing      R.A.  +42.670 Decl. +16.390 (ibex-sun)
error is     R.A.   +1.716 Decl.  +1.069
for a total  1.967 deg

ibex_rotate -o -u 0.728395,0.632159,0.264227 -w ibex-sun -t 2024-05-10T10:43:10
Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
points axis  +1.000000,+0.000000,+0.000000
towards ECI  +0.728395,+0.632159,+0.264227
which is     R.A.  +40.954 Decl. +15.321
missing      R.A.  +47.500 Decl. +17.745 (ibex-sun)
error is     R.A.   +6.546 Decl.  +2.424
for a total  6.727 deg

There is no overlap with orbit 0645 commands.

Command Approval Checklist is attached.

Carol

--
Carol Weaver
University of New Hampshire
503-902-8492

From: NIgel Angold <nangold at princeton.edu>
Date: Monday, April 15, 2024 at 14:45
To: Perry, Timothy E [US] (SP) <Timothy.Perry at ngc.com>
Cc: 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 at earthlink.net <angoldconsulting at earthlink.net>, Paul.Janzen at mso.umt.edu <Paul.Janzen at mso.umt.edu>, 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: Re: [Isocops] IBEX Orbit #646 ATS Approval (April 27 – May 06, 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.

I approve IBEX_2024_117_o0646a_v001.ccvr

Nigel

Perry, Timothy E [US] (SP)<mailto:Timothy.Perry at ngc.com>
April 12, 2024 at 10:17

All,

   Attached are the planning files for Orbit #646. Please respond to this thread with comments and approvals. Approvals for the Orbit 646 ATS are required by COB, 16 April 2024.

Please note the following:

No Battery Balancing

Moderate Eclipse – No action is required

 2024-04-29T14:11:44.833Z,PenumbraEntry,orbit:646

2024-04-29T16:09:47.072Z,PenumbraExit,orbit:646

Command Load Constraint Violation Report (CCVR)

IBEX_2024_117_o0646a_v001.ccvr

# Input files:         1

#   IBEX_2024_117_o0646a_v001.scr

==========================

HARD CONSTRAINT VIOLATIONS

==========================

NO VIOLATIONS.

==========================

SOFT CONSTRAINT VIOLATIONS

==========================

This violation is due to  the moderate eclipse 2024-04-29T14:11:44 - 2024-04-29T16:09:47

IBX-CLC-015: Battery charge falls below minimum from 2024/04/29 15:01:44 UTC -

             2024/04/29 19:52:47 UTC. Lowest charge level is 2737.014667

             watt-minutes during this interval.

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

             transition to science mode at 2024/04/27 08:55:55 UTC

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

             transition to science mode at 2024/05/01 01:14:06 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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