Hi all,

The angle at descending after the apogee sun maneuver is 4.182 deg.

I have looked at the orbit 0668 ATS file, IBEX_2024_318_o0668a_v001.scr and I approve.

The constraint violations in IBEX_2024_318_0668_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_318_o0668a_v001.scr match those in the STF, IBEX_2024_318_o0668a_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_318_o0668a_v001.oef and as verified with ibex_orbit.

There are 2 star tracker outages this orbit. They result in an apogee sun maneuver

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit668_Contacts.txt for all contacts (3).

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 0667 left us pointing in safe directions for the orbit 0668 arc A ascending and descending sequences:

ibex_rotate -o -u -0.664446,-0.682073,-0.305429 -w ibex-sun -t 2024/11:13:13:19:47

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.664446,-0.682073,-0.305429

which is R.A. +225.750 Decl. -17.784

missing R.A. +228.920 Decl. -18.112 (ibex-sun)

error is R.A. +3.170 Decl. +0.328

for a total 3.034 deg

ibex_rotate -o -u -0.664446,-0.682073,-0.305429 -w ibex-sun -t 2024/11:17:16:15:42

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.664446,-0.682073,-0.305429

which is R.A. +225.750 Decl. -17.784

missing R.A. +233.134 Decl. -19.101 (ibex-sun)

error is R.A. +7.384 Decl. +1.317

for a total 7.127 deg

The Sun 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 -r +233.211 -d -19.118 -w ibex-sun -t 2024/11:17:18:03:50

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.565840,-0.756677,-0.327515

which is R.A. +233.211 Decl. -19.118

missing R.A. +233.211 Decl. -19.118 (ibex-sun)

error is R.A. +0.000 Decl. +0.000

for a total 0.000 deg

ibex_rotate -o -r +233.211 -d -19.118 -w ibex-sun -t 2024/11:17:19:33:56

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.565840,-0.756677,-0.327515

which is R.A. +233.211 Decl. -19.118

missing R.A. +233.275 Decl. -19.132 (ibex-sun)

error is R.A. +0.064 Decl. +0.014

for a total 0.062 deg

ibex_rotate -o -r +233.211 -d -19.118 -w ibex-sun -t 2024/11:21:22:15:56

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.565840,-0.756677,-0.327515

which is R.A. +233.211 Decl. -19.118

missing R.A. +237.533 Decl. -20.071 (ibex-sun)

error is R.A. +4.322 Decl. +0.953

for a total 4.182 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0669 apogee:

ibex_rotate -o -u -0.532916,-0.772765,-0.344725 -w ibex-sun -t 2024/11:22:00:14:47

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.532916,-0.772765,-0.344725

which is R.A. +235.409 Decl. -20.165

missing R.A. +237.623 Decl. -20.092 (ibex-sun)

error is R.A. +2.214 Decl. +0.073

for a total 2.080 deg

ibex_rotate -o -u -0.532916,-0.772765,-0.344725 -w ibex-sun -t 2024-11-27T00:45:17

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.532916,-0.772765,-0.344725

which is R.A. +235.409 Decl. -20.165

missing R.A. +242.993 Decl. -21.091 (ibex-sun)

error is R.A. +7.584 Decl. +0.926

for a total 7.157 deg

[carolweav@ena v01]$

There is no overlap with orbit 0667 commands.

Command Approval Checklist is attached.

Carol

Carol Weaver

University of New Hampshire

503-902-8492

From: Wesley, Sheral R [US] (SP) <Sheral.Wesley@ngc.com>
Date: Wednesday, October 30, 2024 at 19:44
To: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>, bhautama@gmail.com <bhautama@gmail.com>, Carol Weaver <carol.weaver@unh.edu>, Cavallo, John A [US] (SP) <John.Cavallo@ngc.com>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, Coca Gonzales, Andrea [US] (SP) <Andrea.CocaGonzales@ngc.com>, Fleming, Ed [US] (SP) <Ed.Fleming@ngc.com>, ADS-IBEX@l3harris.com <ADS-IBEX@l3harris.com>, ibexops <ibexops@gmail.com>, ibexops <IBEXOPS@gmail.com>, isocops <isocops@lists.sr.unh.edu>, kwfairchild <kwfairchild@gmail.com>, Kenneth Fairchild <Ken.Fairchild@unh.edu>, Leonard, Ben [US] (SP) <Benjamin.Leonard@ngc.com>, angoldconsulting@earthlink.net <angoldconsulting@earthlink.net>, Nigel Angold <nangold@princeton.edu>, Reed, Cheryl L [US] (SP) <Cheryl.Reed@ngc.com>, Tyler, Ryan S [US] (SP) <Ryan.Tyler@ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn@ngc.com>, ezirnstein@swri.edu <ezirnstein@swri.edu>, Wesley, Sheral R [US] (SP) <Sheral.Wesley@ngc.com>
Subject: IBEX Orbit #668 ATS Approval (13 Nov - 22 Nov 24)

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.

Please note the following:

Apogee Sun Maneuver
PERIGEE Battery Balancing

# 2024-11-22T10:09:48.648Z,Perigee,orbit:668

SetLongEclipseFlag TRUE $TIME=2024/11:22:09:00:00

SetLongEclipseFlag FALSE $TIME=2024/11:22:10:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2024_318_o0668a_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 2024/11/13 12:04:38 UTC

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

transition to science mode at 2024/11/17 19:03:56 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Best Regards,

Sheral Wesley | Sr Principal Engineer, Satellite Systems

Northrop Grumman Corporation | Space Systems

O: 703-406-5641 | C: 202-236-0802 | sheral.wesley@ngc.com