Hi all,

I have looked at the orbit 0556 ATS file, IBEX_2022_028_o0556a_v001.scr and I approve.

The constraint violations in IBEX_2022_028_o0556a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2022_028_o0556a_v001.scr match those in the STF, IBEX_2022_028_o0556a_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_2022_028_o0556a_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_Orbit556_Contacts.txt for all contacts (3).

No Battery Balancing this orbit.

The inertial maneuver at perigee of orbit 0555 left us pointing in safe directions for the orbit 0556 arc A ascending and descending sequences:

ibex_rotate -o -u 0.635895,-0.70403,-0.316195 -w ibex-sun -t 2022/01:28:22:37:37

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.635895,-0.704030,-0.316195

which is R.A. +312.089 Decl. -18.433

missing R.A. +311.112 Decl. -18.106 (ibex-sun)

error is R.A. +0.977 Decl. +0.327

for a total 0.984 deg

ibex_rotate -o -u 0.635895,-0.70403,-0.316195 -w ibex-sun -t 2022/02:02:02:55:58

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.635895,-0.704030,-0.316195

which is R.A. +312.089 Decl. -18.433

missing R.A. +315.474 Decl. -16.895 (ibex-sun)

error is R.A. +3.385 Decl. +1.538

for a total 3.573 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 +315.548 -d -16.873 -w ibex-sun -t 2022/02:02:04:42:18

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.683107,-0.670163,-0.290251

which is R.A. +315.548 Decl. -16.873

missing R.A. +315.548 Decl. -16.873 (ibex-sun)

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

for a total 0.000 deg

ibex_rotate -o -r +315.548 -d -16.873 -w ibex-sun -t 2022/02:02:06:14:12

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.683107,-0.670163,-0.290251

which is R.A. +315.548 Decl. -16.873

missing R.A. +315.612 Decl. -16.854 (ibex-sun)

error is R.A. +0.064 Decl. +0.019

for a total 0.064 deg

ibex_rotate -o -r +315.548 -d -16.873 -w ibex-sun -t 2022/02:06:11:50:08

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.683107,-0.670163,-0.290251

which is R.A. +315.548 Decl. -16.873

missing R.A. +319.768 Decl. -15.633 (ibex-sun)

error is R.A. +4.220 Decl. +1.240

for a total 4.237 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0557 apogee:

ibex_rotate -o -u 0.752686,-0.59998,-0.271088 -w ibex-sun -t 2022/02:06:17:17:43

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.752686,-0.599980,-0.271088

which is R.A. +321.441 Decl. -15.729

missing R.A. +320.004 Decl. -15.570 (ibex-sun)

error is R.A. +1.437 Decl. +0.159

for a total 1.393 deg

ibex_rotate -o -u 0.752686,-0.59998,-0.271088 -w ibex-sun -t 2022-02-11T11:50:44

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.752686,-0.599980,-0.271088

which is R.A. +321.441 Decl. -15.729

missing R.A. +324.869 Decl. -13.992 (ibex-sun)

error is R.A. +3.428 Decl. +1.737

for a total 3.740 deg

There is no overlap with orbit 0555 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: Monday, 2022-January-17 at 23:59
To: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>, Carol Weaver <carol.weaver@unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin@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>, fair-play@comcast.net <fair-play@comcast.net>, 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>
Subject: RE: IBEX Orbit #556 ATS Approval (28 Jan - 06 Feb 2022)

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 #556. Please respond to this thread with comments and approvals.

Approvals are required by 3:00PM EST, 18 Jan 22

Sheral Wesley | Sr Principal Engineer, Satellite Systems

Northrop Grumman Corporation | Space Systems

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

From: Wesley, Sheral R [US] (SP)
Sent: Friday, January 14, 2022 7:38 PM
To: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>; carol.weaver@unh.edu; Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>; David.Heirtzler@unh.edu; ADS-IBEX@l3harris.com; IBEXOPS@gmail.com; isocops@lists.sr.unh.edu; fair-play@comcast.net; kwfairchild@gmail.com; Ken.Fairchild@unh.edu; angoldconsulting@earthlink.net; 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 #556 ATS Approval (28 Jan - 06 Feb 2022)

Please note the following:

Apogee Sun Maneuver

2022-02-02T04:27:18.000Z,SunMvrBegin,

2022-02-02T04:42:18.000Z,SunMvrEnd,

No Battery Balancing this orbit

Command Load Constraint Violation Report (CCVR)

IBEX_2022_028_o0556a_v001.ccvr

Input files: 1

# IBEX_2022_028_o0556a_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 2022/01/28 19:02:38 UTC

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

transition to science mode at 2022/02/02 05:44:12 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Sheral Wesley | Sr Principal Engineer, Satellite Systems

Northrop Grumman Corporation | Space Systems

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