Hi all,

I have looked at the orbit 0561 ATS file, IBEX_2022_074_o0561a_v001.scr and I approve.

The constraint violations in IBEX_2022_074_o0561a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands and having several commanding tracks close together. The violations are acceptable.

The PL commands in IBEX_2022_074_o0561a_v001.scr match those in the STF, IBEX_2022_074_o0561a_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_074_o0561a_v001.oef and as verified with ibex_orbit.

There are 2 star tracker outages this orbit. The first overlaps with orbit 560 and ends 4 days before apogee maneuver. The second lasts for ~43 hours around the apogee, but the maneuver takes place before the star tracker outage occurs.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit561_Contacts.txt for all contacts (5).

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 Sun maneuver at perigee of orbit 0560 left us pointing in safe directions for the orbit 0561 arc A ascending and descending sequences:

ibex_rotate -o -r +355.278 -d -2.047 -w ibex-sun -t 2022/03:16:03:46:46

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.995970,-0.082269,-0.035719

which is R.A. +355.278 Decl. -2.047

missing R.A. +355.602 Decl. -1.921 (ibex-sun)

error is R.A. +0.324 Decl. +0.126

for a total 0.347 deg

ibex_rotate -o -r +355.278 -d -2.047 -w ibex-sun -t 2022/03:19:22:54:46

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.995970,-0.082269,-0.035719

which is R.A. +355.278 Decl. -2.047

missing R.A. +359.182 Decl. -0.350 (ibex-sun)

error is R.A. +3.904 Decl. +1.697

for a total 4.256 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 0.999799,-0.012338,-0.015795 -w ibex-sun -t 2022/03:20:00:37:54

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.999799,-0.012338,-0.015795

which is R.A. +359.293 Decl. -0.905

missing R.A. +359.248 Decl. -0.320 (ibex-sun)

error is R.A. +0.045 Decl. +0.585

for a total 0.587 deg

ibex_rotate -o -u 0.999799,-0.012338,-0.015795 -w ibex-sun -t 2022/03:20:02:13:00

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.999799,-0.012338,-0.015795

which is R.A. +359.293 Decl. -0.905

missing R.A. +359.308 Decl. -0.293 (ibex-sun)

error is R.A. +0.015 Decl. +0.612

for a total 0.612 deg

ibex_rotate -o -u 0.999799,-0.012338,-0.015795 -w ibex-sun -t 2022/03:24:14:25:42

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.999799,-0.012338,-0.015795

which is R.A. +359.293 Decl. -0.905

missing R.A. +3.301 Decl. +1.442 (ibex-sun)

error is R.A. +355.992 Decl. +2.348

for a total 4.645 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0562 apogee:

ibex_rotate -o -u 0.999527,0.030573,0.003438 -w ibex-sun -t 2022/03:24:18:29:10

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.999527,+0.030573,+0.003438

which is R.A. +1.752 Decl. +0.197

missing R.A. +3.451 Decl. +1.500 (ibex-sun)

error is R.A. +1.699 Decl. +1.303

for a total 2.140 deg

ibex_rotate -o -u 0.999527,0.030573,0.003438 -w ibex-sun -t 2022-03-29T11:58:47

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.999527,+0.030573,+0.003438

which is R.A. +1.752 Decl. +0.197

missing R.A. +7.868 Decl. +3.407 (ibex-sun)

error is R.A. +6.116 Decl. +3.210

for a total 6.904 deg

There is no overlap with orbit 0560 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: Thursday, 2022-March-3 at 13:11
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 #561 ATS Approval ( 16 – 24 Mar 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 #561. Please respond to this thread with comments and approvals.

Approvals are required by COB, 05 Mar 2022

Please note the following:

Battery Balancing this orbit

Begin 2022/03/24 23:00:00– End 2022/03/25 00:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2022_074_o0561a_v001.ccvr

# Input files: 1

# IBEX_2022_074_o0561a_v001.scr

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

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

SOFT CONSTRAINT VIOLATIONS

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

The 2 IBX-CLC-006 constraint violations are acceptable.

IBX-CLC-006: Planned transmission at 2022/03/16 01:58:00 UTC - 2022/03/16

03:02:00 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 2022/03/16 04:58:00 UTC - 2022/03/16

06:02:00 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)

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

transition to science mode at 2022/03/15 22:22:42 UTC

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

transition to science mode at 2022/03/20 01:43:00 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