Hi all,

I have looked at the orbit 495 ATS files IBEX_2020_204_o0495a_BUS_v001.scr and IBEX_2020_204_o0495a_INST_v001.scr and I approve.

There is no overlap with orbit 494 commands by manual inspection or by checking at http://ibex.unh.edu/cgi-bin/ats.cgi, but the commands were difficult to read on the website.

The only constraint violations in IBEX_2020_204_o0495a_INST_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands (2); the violations are expected.

The PL commands in IBEX_2020_204_o0495a_INST_v001.scr match those in the IBEX_2020_204_o0495a_v004.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_204_o0495a_BUS_v001.oef and as verified with ibex_orbit.

There is one star tracker outage this orbit. It starts about 15 minutes before perigee and runs for about 7 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit495_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 494 left us pointing in a safe direction for the orbit 495 arc A ascending and descending sequences:

ibex_rotate -o -u -0.458951,0.818679,0.345151 -w ibex-sun -t 2020/07:22:14:55:56

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. +122.132 Decl. +20.137 (ibex-sun)

error is R.A. +2.857 Decl. +0.054

for a total 2.682 deg

ibex_rotate -o -u -0.458951,0.818679,0.345151 -w ibex-sun -t 2020/07:26:07:20:54

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. +125.748 Decl. +19.389 (ibex-sun)

error is R.A. +6.473 Decl. +0.802

for a total 6.143 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 -0.523944,0.785413,0.329559 -w ibex-sun -t 2020/07:26:09:04:02

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.523944,+0.785413,+0.329559

which is R.A. +123.707 Decl. +19.242

missing R.A. +125.820 Decl. +19.374 (ibex-sun)

error is R.A. +2.113 Decl. +0.132

for a total 1.998 deg

ibex_rotate -o -u -0.523944,0.785413,0.329559 -w ibex-sun -t 2020/07:26:10:39:08

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.523944,+0.785413,+0.329559

which is R.A. +123.707 Decl. +19.242

missing R.A. +125.886 Decl. +19.360 (ibex-sun)

error is R.A. +2.179 Decl. +0.118

for a total 2.060 deg

ibex_rotate -o -u -0.523944,0.785413,0.329559 -w ibex-sun -t 2020/07:30:23:35:55

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.523944,+0.785413,+0.329559

which is R.A. +123.707 Decl. +19.242

missing R.A. +130.418 Decl. +18.280 (ibex-sun)

error is R.A. +6.711 Decl. +0.962

for a total 6.426 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 496 apogee:

ibex_rotate -o -u -0.588573,0.745263,0.313313 -w ibex-sun -t 2020/07:31:03:10:52

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.588573,+0.745263,+0.313313

which is R.A. +128.300 Decl. +18.259

missing R.A. +130.556 Decl. +18.238 (ibex-sun)

error is R.A. +2.256 Decl. +0.021

for a total 2.142 deg

ibex_rotate -o -u -0.588573,0.745263,0.313313 -w ibex-sun -t 2020-08-04T23:24:43

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.588573,+0.745263,+0.313313

which is R.A. +128.300 Decl. +18.259

missing R.A. +135.150 Decl. +17.013 (ibex-sun)

error is R.A. +6.850 Decl. +1.246

for a total 6.645 deg

Lo Background mode for the entire orbit.

Command approval checklist is attached.

Thanks,

Carol

Carol Weaver

University of New Hampshire

503.902.8492

From: "Perry, Timothy E [US] (IS)" <Timothy.Perry@ngc.com>
Date: Wednesday, 1 July 2020 at 17:22
To: "Weaver, Carol" <Carol.Weaver@unh.edu>, "Chubin, Eric [US] (IS)" <Eric.Chubin@ngc.com>, "Heirtzler, David" <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 #495 ATS Approval ( 22 - 31 July 2020 )

Caution - External Email

All,

Attached are the planning files for Orbit #495

Please respond to this thread with comments and approvals.

Approvals are required by 1600 on 03 July 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

# Orbit 495 Battery Balancing

# 2020-07-31T08:59:58.888Z,Perigee,orbit:495

@ECT_SetLongEclipseFlag TRUE $TIME=2020/07:31:08:00:00

@ECT_SetLongEclipseFlag FALSE $TIME=2020/07:31:09:30:00

Reset Master Timer Orbit #493

# Orbit# 493 Reset Master Timer

@EMR_StrobeMReset $TIME=2020/07:13:00:15:00

Command Load Constraint Violation Report (CCVR)

IBEX_2020_204_o0495a_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 2020/07/22 12:19:16 UTC

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

transition to science mode at 2020/07/26 10:09:08 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