Hi all,

The angle at descending after the apogee Sun maneuver is 4.183 deg. The angle at Orbit 558 apogee after the perigee Sun maneuver is 5.035 deg.

I have looked at the orbit 0557 ATS file, IBEX_2022_037_o0557a_v001.scr and I approve.

The constraint violations in IBEX_2022_037_o0557a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2022_037_o0557a_v001.scr match those in the STF, IBEX_2022_037_o0557a_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_037_o0557a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit lasting for ~48 hours overlapping with perigee.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit557_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 0556 left us pointing in safe directions for the orbit 0557 arc A ascending and descending sequences:

ibex_rotate -o -u 0.752686,-0.59998,-0.271088 -w ibex-sun -t 2022/02:07:05:47:20

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. +320.560 Decl. -15.418 (ibex-sun)

error is R.A. +0.881 Decl. +0.311

for a total 0.904 deg

ibex_rotate -o -u 0.752686,-0.59998,-0.271088 -w ibex-sun -t 2022/02:11:10:17:39

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. +324.806 Decl. -14.014 (ibex-sun)

error is R.A. +3.365 Decl. +1.715

for a total 3.676 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 +324.879 -d -13.989 -w ibex-sun -t 2022/02:11:12:05:47

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.793681,-0.558243,-0.241736

which is R.A. +324.879 Decl. -13.989

missing R.A. +324.879 Decl. -13.989 (ibex-sun)

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

for a total 0.000 deg

ibex_rotate -o -r +324.879 -d -13.989 -w ibex-sun -t 2022/02:11:13:35:53

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.793681,-0.558243,-0.241736

which is R.A. +324.879 Decl. -13.989

missing R.A. +324.939 Decl. -13.968 (ibex-sun)

error is R.A. +0.060 Decl. +0.021

for a total 0.062 deg

ibex_rotate -o -r +324.879 -d -13.989 -w ibex-sun -t 2022/02:15:18:35:50

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.793681,-0.558243,-0.241736

which is R.A. +324.879 Decl. -13.989

missing R.A. +328.933 Decl. -12.596 (ibex-sun)

error is R.A. +4.054 Decl. +1.393

for a total 4.183 deg

The Sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0558 apogee:

ibex_rotate -o -r +329.096 -d -12.546 -w ibex-sun -t 2022/02:15:22:35:10

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. +329.096 Decl. -12.546 (ibex-sun)

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

for a total 0.000 deg

ibex_rotate -o -r +329.096 -d -12.546 -w ibex-sun -t 2022-02-20T19:04:51

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. +333.911 Decl. -10.779 (ibex-sun)

error is R.A. +4.815 Decl. +1.767

for a total 5.035 deg

There is no overlap with orbit 0556 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: Tuesday, 2022-January-25 at 14:32
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 #557 ATS Approval (06 Feb 2022 - 16 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 #557. Please respond to this thread with comments and approvals.

Approvals are required by COB, 27 Jan 2022

Please note the following:

Apogee Sun Maneuver - 2022/02:11:11:50:47

Perigee Sun Maneuver - 2022/02:15:22:20:10

Battery Balancing this orbit

Begin 2022/02/16 04:00:00– End 2022/02/16 05:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2022_037_o0557a_v001.ccvr

# Input files: 1

# IBEX_2022_037_o0557a_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 2022/02/07 02:47:22 UTC

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

transition to science mode at 2022/02/11 13:05:53 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