Now with the attachment.

Carol Weaver

University of New Hampshire

503.902.8492

From: Weaver, Carol <Carol.Weaver@unh.edu>
Date: Thursday, 2021-April-29 at 13:56
To: Perry, Timothy E [US] (SP) <Timothy.Perry@ngc.com>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, Heirtzler, David <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>, Fairchild, Kenneth <Ken.Fairchild@unh.edu>, angoldconsulting@earthlink.net <angoldconsulting@earthlink.net>, Paul.Janzen@mso.umt.edu <Paul.Janzen@mso.umt.edu>, 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: Re: IBEX Orbit #527 ATS Approval (10 May – May 19, 2021)

Hi all,

I have looked at the orbit 0527 ATS files, IBEX_2021_129_o0527a_BUS_v001.scr, IBEX_2021_129_o0527a_INST_v001.scr and I approve.

The constraint violations in IBEX_2021_129_o0527a_BUS_v001.ccvr and IBEX_2021_129_o0527a_INST_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_129_o0527a_INST_v001.scr match those in the STF, IBEX_2021_129_o0527a_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_129_o0527a_BUS_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage begins at 2021-05-18 16:49:47, lasts for 10.12 hours, and ends about an hour before the perigee maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit527_Contacts_v2.txt for all contacts.

Battery Balancing is 90 minutes long, 9.5 hours away from PL descending and 1.5 hours away from the maneuver.

The Inertial maneuver at perigee of orbit 0526 left us pointing in safe directions for the orbit 0527 arc A ascending and descending sequences:

ibex_rotate -o -u 0.683656,0.673118,0.282007 -w ibex-sun -t 2021/05:10:03:42:14

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.683656,+0.673118,+0.282007

which is R.A. +44.555 Decl. +16.380

missing R.A. +46.947 Decl. +17.559 (ibex-sun)

error is R.A. +2.392 Decl. +1.179

for a total 2.574 deg

ibex_rotate -o -u 0.683656,0.673118,0.282007 -w ibex-sun -t 2021/05:14:00:59:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.683656,+0.673118,+0.282007

which is R.A. +44.555 Decl. +16.380

missing R.A. +50.839 Decl. +18.583 (ibex-sun)

error is R.A. +6.284 Decl. +2.203

for a total 6.385 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 0.624788,0.720309,0.301322 -w ibex-sun -t 2021/05:14:02:42:53

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.624788,+0.720309,+0.301322

which is R.A. +49.062 Decl. +17.537

missing R.A. +50.911 Decl. +18.601 (ibex-sun)

error is R.A. +1.849 Decl. +1.064

for a total 2.055 deg

ibex_rotate -o -u 0.624788,0.720309,0.301322 -w ibex-sun -t 2021/05:14:04:17:59

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.624788,+0.720309,+0.301322

which is R.A. +49.062 Decl. +17.537

missing R.A. +50.977 Decl. +18.619 (ibex-sun)

error is R.A. +1.915 Decl. +1.082

for a total 2.117 deg

ibex_rotate -o -u 0.624788,0.720309,0.301322 -w ibex-sun -t 2021/05:18:19:58:00

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.624788,+0.720309,+0.301322

which is R.A. +49.062 Decl. +17.537

missing R.A. +55.540 Decl. +19.680 (ibex-sun)

error is R.A. +6.478 Decl. +2.143

for a total 6.502 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0528 apogee:

ibex_rotate -o -u 0.560428,0.763405,0.321142 -w ibex-sun -t 2021/05:19:04:00:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.560428,+0.763405,+0.321142

which is R.A. +53.717 Decl. +18.732

missing R.A. +55.855 Decl. +19.733 (ibex-sun)

error is R.A. +2.138 Decl. +1.001

for a total 2.253 deg

ibex_rotate -o -u 0.560428,0.763405,0.321142 -w ibex-sun -t 2021-05-23T18:56:50

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.560428,+0.763405,+0.321142

which is R.A. +53.717 Decl. +18.732

missing R.A. +60.546 Decl. +20.692 (ibex-sun)

error is R.A. +6.829 Decl. +1.960

for a total 6.720 deg

There is no overlap with orbit 0526 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, 2021-April-27 at 14:39
To: Weaver, Carol <Carol.Weaver@unh.edu>, Chubin, Eric [US] (SP) <Eric.Chubin@ngc.com>, Heirtzler, David <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>, Fairchild, Kenneth <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 #527 ATS Approval (10 May – May 19, 2021)

Caution - External Email

All,

Attached are the planning files for Orbit #526. Please respond to this thread with comments and approvals.

Approvals are required by COB on 29 April 2021

Please note the following:

I generated 3 separate ATS files BUS, INST and a complete file. The BUS and INST will be the files to be uplinked. The complete ATS, I used as a sanity check to see how the commands lined up. Since we are in a new phase of ATS generation. IF you have any ideas of doing this differently, let me know.

The 3 ATS files have been changed to word files and encrypted. The files that have been transferred via MFT have not been encrypted and are still text files.

I moved the 2 House Keeping commands from the INST ATS to the BUS ATS. I commented out the 2 commands in the INST ATS. If for some reason we were unable to uplink the INST Commands for this orbit, we would have been in the wrong spacecraft state for executing the maneuver commands.

Battery Balancing this orbit

Begin 2021/05:19:05:30:00– End 2021/05:19:07:00:00

# Orbit# 525 Reset Master Timer - 2021/05:01:00:45:00

APL Contact 2021-05-10,04:00:00- 2021-05-10,05:00:00

Just a reminder for the APL contact. We start off at 2k D\L, after 5 minutes we switch to 320k D\L, Then 5 minutes later we start the SSR Dump with Dump New command

Command Load Constraint Violation Report (CCVR)

IBEX_2021_129_o0527a_v001.ccvr

Input files: 1

# IBEX_2021_129_o0527a_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 2021/05/09 23:47:49 UTC

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

transition to science mode at 2021/05/14 03:47:59 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