Hi all,

I have looked at the orbit 0658 ATS file, IBEX_2024_225_o0658a_v001.scr and I approve.

The constraint violations in IBEX_2024_225_o0658a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2024_225_o0658a_v001.scr match those in the STF, IBEX_2024_225_o0658a_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_225_o0658a_v001.oef and as verified with ibex_orbit.

There are 2 star tracker outages this orbit. The first outage begins at 2024-08-13 02:30:00 and lasts for 8.8 hours. The second outage begins at 2024-08-21 09:59:20 and lasts for 9.4 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit658_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The Inertial maneuver at perigee of orbit 0657 left us pointing in safe directions for the orbit 0658 arc A ascending and descending sequences:

ibex_rotate -o -u -0.739924,0.620716,0.259274 -w ibex-sun -t 2024/08:13:04:00:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.739924,+0.620716,+0.259274

which is R.A. +140.007 Decl. +15.027

missing R.A. +142.958 Decl. +14.617 (ibex-sun)

error is R.A. +2.951 Decl. +0.410

for a total 2.882 deg

ibex_rotate -o -u -0.739924,0.620716,0.259274 -w ibex-sun -t 2024/08:17:06:13:26

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.739924,+0.620716,+0.259274

which is R.A. +140.007 Decl. +15.027

missing R.A. +146.700 Decl. +13.412 (ibex-sun)

error is R.A. +6.693 Decl. +1.615

for a total 6.686 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 -0.78845,0.568147,0.235702 -w ibex-sun -t 2024/08:17:07:56:10

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.788450,+0.568147,+0.235702

which is R.A. +144.224 Decl. +13.633

missing R.A. +146.767 Decl. +13.389 (ibex-sun)

error is R.A. +2.544 Decl. +0.244

for a total 2.485 deg

ibex_rotate -o -u -0.78845,0.568147,0.235702 -w ibex-sun -t 2024/08:17:09:31:40

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.788450,+0.568147,+0.235702

which is R.A. +144.224 Decl. +13.633

missing R.A. +146.830 Decl. +13.369 (ibex-sun)

error is R.A. +2.606 Decl. +0.264

for a total 2.548 deg

ibex_rotate -o -u -0.78845,0.568147,0.235702 -w ibex-sun -t 2024/08:21:05:18:42

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.788450,+0.568147,+0.235702

which is R.A. +144.224 Decl. +13.633

missing R.A. +150.488 Decl. +12.070 (ibex-sun)

error is R.A. +6.264 Decl. +1.563

for a total 6.304 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0659 apogee:

ibex_rotate -o -u -0.832924,0.511237,0.211837 -w ibex-sun -t 2024/08:21:07:37:55

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.832924,+0.511237,+0.211837

which is R.A. +148.459 Decl. +12.230

missing R.A. +150.582 Decl. +12.033 (ibex-sun)

error is R.A. +2.123 Decl. +0.197

for a total 2.084 deg

ibex_rotate -o -u -0.832924,0.511237,0.211837 -w ibex-sun -t 2024-08-26T08:47:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.832924,+0.511237,+0.211837

which is R.A. +148.459 Decl. +12.230

missing R.A. +155.104 Decl. +10.366 (ibex-sun)

error is R.A. +6.645 Decl. +1.864

for a total 6.777 deg

There is no overlap with orbit 0657 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: Thursday, August 1, 2024 at 14:58
To: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>, Carol Weaver <carol.weaver@unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, Coca Gonzales, Andrea [US] (SP) <Andrea.CocaGonzales@ngc.com>, David Heirtzler <David.Heirtzler@unh.edu>, ADS-IBEX@l3harris.com <ADS-IBEX@l3harris.com>, IBEXOPS@gmail.com <IBEXOPS@gmail.com>, isocops@lists.sr.unh.edu <isocops@lists.sr.unh.edu>, kwfairchild@gmail.com <kwfairchild@gmail.com>, Kenneth Fairchild <Ken.Fairchild@unh.edu>, angoldconsulting@earthlink.net <angoldconsulting@earthlink.net>, Paul.Janzen@mso.umt.edu <Paul.Janzen@mso.umt.edu>, Tyler, Ryan S [US] (SP) <Ryan.Tyler@ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn@ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley@ngc.com>
Subject: IBEX Orbit #658 ATS Approval (August 13 - 22, 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.

All,

The planning file for Orbit# 658 are attached. Please respond to this email thread with your comments and approvals. Approvals for Orbit# 658 are required by COB 2 Aug 24.

Please note the following:

Command Load Constraint Violation Report (CCVR)

IBEX_2024_225_o0658a_v001.ccvr

# Input files: 1

# IBEX_2024_225_o0658a_v001.scr

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

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

SOFT CONSTRAINT VIOLATIONS

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

IBX-CLC-006: Planned transmission at 2024/08/21 11:58:00 UTC - 2024/08/21

13:02:00 UTC is followed by one or more additional transmissions

which, when combined, exceed the maximum transmission time of 5400

seconds within a 18000-second window (total planned transmission

time this window is 7680.000 seconds)

IBX-CLC-006: Planned transmission at 2024/08/21 16:58:00 UTC - 2024/08/21

18:02:00 UTC is preceded by one or more additional transmissions

which, when combined, exceed the maximum transmission time of 5400

seconds within a 18000-second window (total planned transmission

time this window is 7680.000 seconds)

(2) scheduled perigee contacts
IBEX,USHI01,ADD,08/21/24,234,12:00:00,08/21/24,234,13:00:00,LAHO 320K IBEX-2 Orbit# 658 SSR_Dump/Tracking Contact 11re Desc
IBEX,USAK01,ADD,08/21/24,234,17:00:00,08/21/24,234,18:00:00,LAHO 2K IBEX-2 Orbit# 658 Tracking Contact Perigee

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

transition to science mode at 2024/08/13 02:34:02 UTC

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

transition to science mode at 2024/08/17 09:01:40 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