Hi all,

The angle at descending after the apogee sun maneuver is 4.157 deg

I have looked at the orbit 0558 ATS file, IBEX_2022_047_o0558a_v001.scr and I approve.

The constraint violations in IBEX_2022_047_o0558a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2022_047_o0558a_v001.scr match those in the STF, IBEX_2022_047_o0558a_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_047_o0558a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outages this orbit. Starting at the perigee of orbit 557 and lasting about 7 days through the apogee of 558.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit558_Contacts.txt for all contacts (4).

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 0557 left us pointing in safe directions for the orbit 0558 arc A ascending and descending sequences:

ibex_rotate -o -r +329.096 -d -12.546 -w ibex-sun -t 2022/02:16:11:50:36

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.837541,-0.501337,-0.217223

which is R.A. +329.096 Decl. -12.546

missing R.A. +329.659 Decl. -12.369 (ibex-sun)

error is R.A. +0.563 Decl. +0.177

for a total 0.577 deg

ibex_rotate -o -r +329.096 -d -12.546 -w ibex-sun -t 2022/02:20:17:33:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.837541,-0.501337,-0.217223

which is R.A. +329.096 Decl. -12.546

missing R.A. +333.851 Decl. -10.802 (ibex-sun)

error is R.A. +4.755 Decl. +1.744

for a total 4.972 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 +333.921 -d -10.775 -w ibex-sun -t 2022/02:20:19:21:31

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.882353,-0.431859,-0.186953

which is R.A. +333.921 Decl. -10.775

missing R.A. +333.921 Decl. -10.775 (ibex-sun)

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

for a total 0.001 deg

ibex_rotate -o -r +333.921 -d -10.775 -w ibex-sun -t 2022/02:20:20:51:37

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.882353,-0.431859,-0.186953

which is R.A. +333.921 Decl. -10.775

missing R.A. +333.981 Decl. -10.751 (ibex-sun)

error is R.A. +0.060 Decl. +0.024

for a total 0.063 deg

ibex_rotate -o -r +333.921 -d -10.775 -w ibex-sun -t 2022/02:25:01:42:03

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.882353,-0.431859,-0.186953

which is R.A. +333.921 Decl. -10.775

missing R.A. +337.857 Decl. -9.271 (ibex-sun)

error is R.A. +3.936 Decl. +1.504

for a total 4.157 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0559 apogee:

ibex_rotate -o -u 0.92426,-0.346137,-0.161035 -w ibex-sun -t 2022/02:25:07:07:26

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.924260,-0.346137,-0.161035

which is R.A. +339.469 Decl. -9.267

missing R.A. +338.074 Decl. -9.196 (ibex-sun)

error is R.A. +1.395 Decl. +0.071

for a total 1.379 deg

ibex_rotate -o -u 0.92426,-0.346137,-0.161035 -w ibex-sun -t 2022-03-01T23:00:37

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.924260,-0.346137,-0.161035

which is R.A. +339.469 Decl. -9.267

missing R.A. +342.592 Decl. -7.376 (ibex-sun)

error is R.A. +3.123 Decl. +1.891

for a total 3.623 deg

There is no overlap with orbit 0557 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-February-3 at 15:16
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 #558 ATS Approval (16 Feb 2022 - 25 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 #558. Please respond to this thread with comments and approvals.

Approvals are required by COB, 05 Feb 2022

Please note the following:

Apogee Sun Maneuver – 2022/02/20 19:06:31

Battery Balancing this orbit

Begin 2022/02:25:09:00:00– End 2022/02:25:10:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2022_047_o0558a_v001.ccvr

# Input files: 1

# IBEX_2022_047_o0558a_v001.scr

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

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

SOFT CONSTRAINT VIOLATIONS

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

These 2 IBX-CLC-006 Soft constraint violations are acceptable. The 2 perigee contacts have only 2 hours of separation and the MPS limit is set for a 5 hour minimum separation.

IBX-CLC-006: Planned transmission at 2022/02/25 06:58:00 UTC - 2022/02/25

08:02:00 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 2022/02/25 10:58:00 UTC - 2022/02/25

12:02:00 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 2022/02/16 05:31:20 UTC

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

transition to science mode at 2022/02/20 20:21:37 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