Hi all,

I have looked at the orbit 0548 ATS file, IBEX_2021_319_o0548a_v001.scr and I approve.

The constraint violations in IBEX_2021_319_o0548a_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_319_o0548a_v001.scr match those in the STF, IBEX_2021_319_o0548a_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_319_o0548a_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. It lasts for 68.4 hours and overlaps with the beginning of the apogee maneuver window start. It ends 9.3 hours from the inertial maneuver giving the star tracker time to recover from the outage.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit548_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 0547 left us pointing in safe directions for the orbit 0548 arc A ascending and descending sequences:

ibex_rotate -o -u -0.628645,-0.709905,-0.317553 -w ibex-sun -t 2021/11:16:09:42:07

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.628645,-0.709905,-0.317553

which is R.A. +228.474 Decl. -18.515

missing R.A. +231.607 Decl. -18.786 (ibex-sun)

error is R.A. +3.133 Decl. +0.271

for a total 2.981 deg

ibex_rotate -o -u -0.628645,-0.709905,-0.317553 -w ibex-sun -t 2021/11:20:15:30:22

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.628645,-0.709905,-0.317553

which is R.A. +228.474 Decl. -18.515

missing R.A. +235.940 Decl. -19.742 (ibex-sun)

error is R.A. +7.466 Decl. +1.227

for a total 7.159 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 -0.562433,-0.754589,-0.338032 -w ibex-sun -t 2021/11:20:17:14:16

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.562433,-0.754589,-0.338032

which is R.A. +233.301 Decl. -19.757

missing R.A. +236.014 Decl. -19.757 (ibex-sun)

error is R.A. +2.713 Decl. +0.000

for a total 2.553 deg

ibex_rotate -o -u -0.562433,-0.754589,-0.338032 -w ibex-sun -t 2021/11:20:18:48:36

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.562433,-0.754589,-0.338032

which is R.A. +233.301 Decl. -19.757

missing R.A. +236.081 Decl. -19.771 (ibex-sun)

error is R.A. +2.780 Decl. +0.014

for a total 2.617 deg

ibex_rotate -o -u -0.562433,-0.754589,-0.338032 -w ibex-sun -t 2021/11:24:18:01:44

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.562433,-0.754589,-0.338032

which is R.A. +233.301 Decl. -19.757

missing R.A. +240.284 Decl. -20.614 (ibex-sun)

error is R.A. +6.983 Decl. +0.857

for a total 6.609 deg

The Inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0549 apogee:

ibex_rotate -o -u -0.495239,-0.793472,-0.353752 -w ibex-sun -t 2021/11:24:21:06:23

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.495239,-0.793472,-0.353752

which is R.A. +238.030 Decl. -20.717

missing R.A. +240.428 Decl. -20.647 (ibex-sun)

error is R.A. +2.398 Decl. +0.070

for a total 2.244 deg

ibex_rotate -o -u -0.495239,-0.793472,-0.353752 -w ibex-sun -t 2021-11-29T16:54:33

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.495239,-0.793472,-0.353752

which is R.A. +238.030 Decl. -20.717

missing R.A. +245.560 Decl. -21.524 (ibex-sun)

error is R.A. +7.530 Decl. +0.807

for a total 7.069 deg

There is an overlap with orbit 0547 commands for the last contact in the previous ATS. This is acceptable.

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, 2021-November-2 at 17:50
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 #548 ATS Approval (16 - 25 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 #548. Please respond to this thread with comments and approvals.

Approvals are required by COB, 05 Nov 2021

Please note the following:

Battery Balancing this orbit

Begin 2021/11/25 04:00:00 – End 2021/11/25 05:30:00

Command Load Constraint Violation Report (CCVR)

IBEX_2021_319_o0548a_v001.ccvr

# Input files: 1

# IBEX_2021_319_o0548a_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 2021/11/16 07:08:58 UTC

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

transition to science mode at 2021/11/20 18:18:36 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