Hi all,

I have looked at the orbit 0529 ATS files, IBEX_2021_148_o0529a_BUS_v001.scr, IBEX_2021_148_o0529a_INST_v001.scr and I approve.

The constraint violations in IBEX_2021_148_o0529a_BUS_v001.ccvr and IBEX_2021_148_o0529a_INST_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands. The violations are acceptable.

The PL commands in IBEX_2021_148_o0529a_INST_v001.scr match those in the STF, IBEX_2021_148_o0529a_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_148_o0529a_BUS_v001.oef and as verified with ibex_orbit.

There is 1 star tracker outage this orbit. Outage lasts for ~10 hours and ends ~45 minutes before perigee maneuver.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit529_Contacts.txt for all contacts (4).

No Battery Balancing this orbit

The Inertial maneuver at perigee of orbit 0528 left us pointing in safe directions for the orbit 0529 arc A ascending and descending sequences:

ibex_rotate -o -u 0.426961,0.833207,0.351384 -w ibex-sun -t 2021/05:28:17:40:57

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.426961,+0.833207,+0.351384

which is R.A. +62.868 Decl. +20.572

missing R.A. +65.480 Decl. +21.505 (ibex-sun)

error is R.A. +2.612 Decl. +0.933

for a total 2.610 deg

ibex_rotate -o -u 0.426961,0.833207,0.351384 -w ibex-sun -t 2021/06:01:11:21:56

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.426961,+0.833207,+0.351384

which is R.A. +62.868 Decl. +20.572

missing R.A. +69.341 Decl. +22.082 (ibex-sun)

error is R.A. +6.473 Decl. +1.510

for a total 6.215 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 0.357707,0.860733,0.362194 -w ibex-sun -t 2021/06:01:13:05:04

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.357707,+0.860733,+0.362194

which is R.A. +67.433 Decl. +21.235

missing R.A. +69.416 Decl. +22.093 (ibex-sun)

error is R.A. +1.983 Decl. +0.858

for a total 2.033 deg

ibex_rotate -o -u 0.357707,0.860733,0.362194 -w ibex-sun -t 2021/06:01:14:40:10

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.357707,+0.860733,+0.362194

which is R.A. +67.433 Decl. +21.235

missing R.A. +69.485 Decl. +22.103 (ibex-sun)

error is R.A. +2.052 Decl. +0.868

for a total 2.095 deg

ibex_rotate -o -u 0.357707,0.860733,0.362194 -w ibex-sun -t 2021/06:06:03:32:33

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.357707,+0.860733,+0.362194

which is R.A. +67.433 Decl. +21.235

missing R.A. +74.144 Decl. +22.650 (ibex-sun)

error is R.A. +6.711 Decl. +1.415

for a total 6.383 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 0530 apogee:

ibex_rotate -o -u 0.283804,0.883311,0.373117 -w ibex-sun -t 2021/06:06:15:22:11

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.283804,+0.883311,+0.373117

which is R.A. +72.188 Decl. +21.908

missing R.A. +74.619 Decl. +22.675 (ibex-sun)

error is R.A. +2.431 Decl. +0.767

for a total 2.377 deg

ibex_rotate -o -u 0.283804,0.883311,0.373117 -w ibex-sun -t 2021-06-11T04:59:02

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

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.283804,+0.883311,+0.373117

which is R.A. +72.188 Decl. +21.908

missing R.A. +79.370 Decl. +23.089 (ibex-sun)

error is R.A. +7.182 Decl. +1.181

for a total 6.739 deg

There is no overlap with orbit 0528 commands.

Command Approval Checklist is attached.

Carol

Carol Weaver

University of New Hampshire

503.902.8492

From: Wesley, Sheral R [US] (SP) <Sheral.Wesley@ngc.com>
Date: Friday, 2021-May-14 at 17:40
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 #529 ATS Approval (28 May - 06 June, 2021)

Caution - External Email

All,

Attached are the planning files for Orbit #529. Please respond to this thread with comments and approvals.

Approvals are required by COB on 17 May 2021.

Please note the following:

I have 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. I will send out another email with the password. 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

None

Orbit# 527 Reset Master Timer - 2021/05:19:15:45:00

APL Contact 2021-06-06/12:00:00 - 2021-06-06/13:00:00

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)

Filename: IBEX_2021_148_o0529a_v001.ccvr

# File type: Command Load Constraint Violation Report (CCVR)

# Create time: 2021/134.182455

# Plan period start: 2021/148.030000

# Plan period stop: 2021/157.215500

# Default time format: UTC

# Input files: 1

# IBEX_2021_148_o0529a_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 2021/05/28 14:41:44 UTC

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

transition to science mode at 2021/06/01 14:10:10 UTC

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

OTHER MESSAGES

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

NO MESSAGES.

Sheral Wesley | Principal Engineer, Satellite Systems

Northrop Grumman Corporation | Space Systems

O: 703-406-5641 | C: 202-236-0802 | sheral.wesley@ngc.com