Hi all,

The angle at descending after the apogee sun maneuver is 4.164 deg.

I have looked at the orbit 0545 ATS file, IBEX_2021_292_o0545a_v001.scr and I approve.

The constraint violations in IBEX_2021_292_o0545a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_292_o0545a_v001.scr match those in the STF, IBEX_2021_292_o0545a_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_292_o0545a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit ending shortly before the apogee sun maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit545_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 Sun maneuver at perigee of orbit 0544 left us pointing in safe directions for the orbit 0545 arc A ascending and descending sequences:

ibex_rotate -o -r +204.367 -d -10.131 -w ibex-sun -t 2021/10:20:09:16:04

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.896718,-0.406147,-0.175899

which is R.A. +204.367 Decl. -10.131

missing R.A. +204.991 Decl. -10.398 (ibex-sun)

error is R.A. +0.624 Decl. +0.267

for a total 0.669 deg

ibex_rotate -o -r +204.367 -d -10.131 -w ibex-sun -t 2021/10:24:11:24:12

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.896718,-0.406147,-0.175899

which is R.A. +204.367 Decl. -10.131

missing R.A. +208.767 Decl. -11.773 (ibex-sun)

error is R.A. +4.400 Decl. +1.642

for a total 4.621 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 +208.838 -d -11.798 -w ibex-sun -t 2021/10:24:13:12:20

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.857481,-0.472145,-0.204462

which is R.A. +208.838 Decl. -11.798

missing R.A. +208.838 Decl. -11.798 (ibex-sun)

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

for a total 0.000 deg

ibex_rotate -o -r +208.838 -d -11.798 -w ibex-sun -t 2021/10:24:14:42:26

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.857481,-0.472145,-0.204462

which is R.A. +208.838 Decl. -11.798

missing R.A. +208.897 Decl. -11.819 (ibex-sun)

error is R.A. +0.059 Decl. +0.021

for a total 0.062 deg

ibex_rotate -o -r +208.838 -d -11.798 -w ibex-sun -t 2021/10:28:15:28:20

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.857481,-0.472145,-0.204462

which is R.A. +208.838 Decl. -11.798

missing R.A. +212.848 Decl. -13.215 (ibex-sun)

error is R.A. +4.010 Decl. +1.417

for a total 4.164 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0546 apogee:

ibex_rotate -o -u -0.837958,-0.497069,-0.225274 -w ibex-sun -t 2021/10:28:18:45:35

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. +212.988 Decl. -13.269 (ibex-sun)

error is R.A. +2.312 Decl. +0.250

for a total 2.265 deg

ibex_rotate -o -u -0.837958,-0.497069,-0.225274 -w ibex-sun -t 2021-11-02T12:57:02

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. +217.551 Decl. -14.788 (ibex-sun)

error is R.A. +6.875 Decl. +1.769

for a total 6.903 deg

There is no overlap with orbit 0544 commands.

Command Approval Checklist is attached.

Carol

Carol Weaver

University of New Hampshire

503.902.8492

From: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>
Date: Wednesday, 2021-October-6 at 19:27
To: 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>, Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>, Tyler, Ryan S [US] (SP) <Ryan.Tyler@ngc.com>, Wesley, Sheral R [US] (SP) <Sheral.Wesley@ngc.com>, Wynn, Reese [US] (SP) <Reese.Wynn@ngc.com>
Subject: IBEX Orbit #545 ATS Approval (20 – 29 Oct, 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 #545. Please respond to this thread with comments and approvals.

Approvals are required by COB, 09 Oct 2021

Please note the following:

Apogee Sun Maneuver - 2021/10:24:12:57:20

No Battery Balancing this orbit

Begin 2021/10/29 01:00:00– End 2021/10/29 02:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2021_292_o0545a_v001.ccvr

# Input files: 1

# IBEX_2021_292_o0545a_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 2021/10/20 06:32:57 UTC

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

transition to science mode at 2021/10/24 14:12:26 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Timothy E.Perry

CRS IBEX OCO-2

Mission Operations

timothy.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430