Hi all,

The angle at descending after the apogee sun maneuver is 4.093 deg

I have looked at the orbit 0546 ATS file, IBEX_2021_302_o0546a_v001.scr and I approve.

The constraint violations in IBEX_2021_302_o0546a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_302_o0546a_v001.scr match those in the STF, IBEX_2021_302_o0546a_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_2021_302_o0546a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. It lasts for ~32 hours ending about 18 hours before the apogee maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit546_Contacts.txt for all contacts (3).

Battery Balancing is 90 minutes long, more than 2 hours away from payload descending macros, and more than 1 hour away from maneuver.

The inertial maneuver at perigee of orbit 0545 left us pointing in safe directions for the orbit 0546 arc A ascending and descending sequences:

ibex_rotate -o -u -0.837958,-0.497069,-0.225274 -w ibex-sun -t 2021/10:29:11:23:33

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.837958,-0.497069,-0.225274

which is R.A. +210.676 Decl. -13.019

missing R.A. +213.674 Decl. -13.536 (ibex-sun)

error is R.A. +2.998 Decl. +0.517

for a total 2.964 deg

ibex_rotate -o -u -0.837958,-0.497069,-0.225274 -w ibex-sun -t 2021/11:02:11:26:46

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.837958,-0.497069,-0.225274

which is R.A. +210.676 Decl. -13.019

missing R.A. +217.490 Decl. -14.769 (ibex-sun)

error is R.A. +6.814 Decl. +1.750

for a total 6.842 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 +217.563 -d -14.791 -w ibex-sun -t 2021/11:02:13:14:54

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.766417,-0.589432,-0.255294

which is R.A. +217.563 Decl. -14.791

missing R.A. +217.563 Decl. -14.791 (ibex-sun)

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

for a total 0.000 deg

ibex_rotate -o -r +217.563 -d -14.791 -w ibex-sun -t 2021/11:02:14:45:00

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.766417,-0.589432,-0.255294

which is R.A. +217.563 Decl. -14.791

missing R.A. +217.624 Decl. -14.810 (ibex-sun)

error is R.A. +0.061 Decl. +0.019

for a total 0.062 deg

ibex_rotate -o -r +217.563 -d -14.791 -w ibex-sun -t 2021/11:06:13:45:54

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.766417,-0.589432,-0.255294

which is R.A. +217.563 Decl. -14.791

missing R.A. +221.606 Decl. -16.041 (ibex-sun)

error is R.A. +4.043 Decl. +1.250

for a total 4.093 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0547 apogee:

ibex_rotate -o -u -0.743002,-0.610439,-0.274429 -w ibex-sun -t 2021/11:06:17:02:16

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.743002,-0.610439,-0.274429

which is R.A. +219.406 Decl. -15.928

missing R.A. +221.750 Decl. -16.090 (ibex-sun)

error is R.A. +2.344 Decl. +0.162

for a total 2.259 deg

ibex_rotate -o -u -0.743002,-0.610439,-0.274429 -w ibex-sun -t 2021-11-11T11:52:47

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.743002,-0.610439,-0.274429

which is R.A. +219.406 Decl. -15.928

missing R.A. +226.504 Decl. -17.446 (ibex-sun)

error is R.A. +7.098 Decl. +1.518

for a total 6.966 deg

There is no overlap with orbit 0545 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: Sunday, 2021-October-17 at 04:44
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>, Wesley, Sheral R [US] (SP) <Sheral.Wesley@ngc.com>
Subject: IBEX Orbit #546 ATS Approval (29 Oct - 7 Nov 2021)

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

Approvals are required by COB, 18 Oct 2021

*Usual password for ATS document

Please note the following:

Apogee Sun maneuver 2021/11:02:12:59:54
Orbit# 546 Battery Balancing

# 2021-11-06T23:53:38.849Z,Perigee,orbit:546

SetLongEclipseFlag TRUE $TIME=2021/11:06:23:00:00

SetLongEclipseFlag FALSE $TIME=2021/11:07:00:30:00

Command Load Constraint Violation Report (CCVR)

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

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 2021/10/29 08:51:58 UTC

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

transition to science mode at 2021/11/02 14:15:00 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