I have looked at the orbit 494 ATS files,

IBEX_2020_194_o0494a_BUS_v001.scr

and

IBEX_2020_194_o0494a_INST_v001.scr,

and I approve.

The only constraint violations in

IBEX_2020_194_o0494a_BUS_v001.ccvr

and

IBEX_2020_194_o0494a_INST_v001.ccvr

are from the removal of the

ACT_SetSpinPulseProtectEnable Enable

commands (2); the violations are expected.

The PL commands in

IBEX_2020_194_o0494a_INST_v001.scr

match those in the v002 STF,

IBEX_2020_194_o0494a_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_2020_194_o0494a_BUS_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage. The outage starts about 2 hours before perigee and runs for about 8 hours. No despinning should be required due to this outage.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file,

IBEX_Orbit494_Contacts.txt,

for all contacts (3).

We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.

The inertial precession maneuver at perigee of orbit 493 left us pointing in safe directions for the orbit 494 arc A ascending and descending sequences:

ibex_rotate -o -u -0.316162,0.873961,0.369098 -w ibex-sun -t 2020/07:13:06:46:03

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.316162,+0.873961,+0.369098

which is R.A. +109.888 Decl. +21.660

missing R.A. +112.743 Decl. +21.771 (ibex-sun)

error is R.A. +2.855 Decl. +0.111

for a total 2.655 deg

ibex_rotate -o -u -0.316162,0.873961,0.369098 -w ibex-sun -t 2020/07:17:01:49:31

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.316162,+0.873961,+0.369098

which is R.A. +109.888 Decl. +21.660

missing R.A. +116.563 Decl. +21.198 (ibex-sun)

error is R.A. +6.675 Decl. +0.462

for a total 6.230 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 -0.387384,0.8498,0.357455 -w ibex-sun -t 2020/07:17:03:32:39

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.387384,+0.849800,+0.357455

which is R.A. +114.506 Decl. +20.944

missing R.A. +116.637 Decl. +21.187 (ibex-sun)

error is R.A. +2.131 Decl. +0.243

for a total 2.003 deg

ibex_rotate -o -u -0.387384,0.8498,0.357455 -w ibex-sun -t 2020/07:17:05:07:45

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.387384,+0.849800,+0.357455

which is R.A. +114.506 Decl. +20.944

missing R.A. +116.705 Decl. +21.176 (ibex-sun)

error is R.A. +2.199 Decl. +0.232

for a total 2.065 deg

ibex_rotate -o -u -0.387384,0.8498,0.357455 -w ibex-sun -t 2020/07:21:19:26:26

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.387384,+0.849800,+0.357455

which is R.A. +114.506 Decl. +20.944

missing R.A. +121.383 Decl. +20.324 (ibex-sun)

error is R.A. +6.877 Decl. +0.620

for a total 6.465 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 495 apogee:

ibex_rotate -o -u -0.458951,0.818679,0.345151 -w ibex-sun -t 2020/07:21:22:52:06

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.458951,+0.818679,+0.345151

which is R.A. +119.275 Decl. +20.191

missing R.A. +121.518 Decl. +20.291 (ibex-sun)

error is R.A. +2.243 Decl. +0.100

for a total 2.107 deg

ibex_rotate -o -u -0.458951,0.818679,0.345151 -w ibex-sun -t 2020-07-26T18:47:56.836Z

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.458951,+0.818679,+0.345151

which is R.A. +119.275 Decl. +20.191

missing R.A. +126.228 Decl. +19.288 (ibex-sun)

error is R.A. +6.953 Decl. +0.903

for a total 6.606 deg

Lo Background mode for the entire orbit.

There is no overlap with orbit 493 commands by manual inspection or by checking at

http://ibex.unh.edu/cgi-bin/ats.cgi.

Command Approval Checklist is attached.

Ken

All,

I am resending these files with the corrections to the subject and the first part of my email. These files are for Orbit 494 not 492. Sorry about the typo’s.

Attached are the planning files for Orbit #494

Please respond to this thread with comments and approvals.

Approvals are required by COB on 24 June 2020

From: Perry, Timothy E [US] (IS)
Sent: Monday, June 22, 2020 3:50 PM
To: carol.weaver@unh.edu; Chubin, Eric [US] (IS) <Eric.Chubin@ngc.com>; David Heirtzler <David.Heirtzler@unh.edu>; IBEX FDG <IBEX@applieddefense.info>; IBEXOPS <IBEXOPS@gmail.com>; ISOC <isocops@lists.sr.unh.edu>; Ken Fairchild <fair-play@comcast.net>; Ken Fairchild (kwfairchild@gmail.com) <kwfairchild@gmail.com>; Nigel Angold <nigel.angold@nasa.gov>; Nigel Angold <angoldconsulting@earthlink.net>; Paul Janzen <paul.janzen@umontana.edu>; Perry, Timothy E [US] (IS) <Timothy.Perry@ngc.com>; Tyler, Ryan S [US] (IS) <Ryan.Tyler@ngc.com>; Wesley, Sheral R [US] (IS) <Sheral.Wesley@ngc.com>; Wynn, Reese [US] (IS) <Reese.Wynn@ngc.com>
Subject: IBEX Orbit #492 ATS Approval ( 13 - 22 July 2020 )

All,

Attached are the planning files for Orbit #492

Please respond to this thread with comments and approvals.

Approvals are required by COB on 01 June 2020

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. 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

# Orbit 494 Battery Balancing

# 2020-07-22T05:11:44.581Z,Perigee,orbit:494

@ECT_SetLongEclipseFlag TRUE $TIME=2020/07:22:05:00:00

@ECT_SetLongEclipseFlag FALSE $TIME=2020/07:22:06:30:00

5. # Orbit# 492 Reset Master Timer - 2020/07:03:18:45:00

6. Command Load Constraint Violation Report (CCVR)

IBEX_2020_194_o0494a_v001.ccvr

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

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 2020/07/13 04:02:04 UTC

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

transition to science mode at 2020/07/17 04:37:45 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