Hi all,

I have looked at the orbit 496 ATS files IBEX_2020_213_o0496a_BUS_v001.scr and IBEX_2020_213_o0496a_INST_v001.scr and I approve.

There was one overlap with orbit 495 commands on http://ibex.unh.edu/cgi-bin/ats.cgi and the initial files with the 2022 file names are still ingested.

The constraint violations in IBEX_2020_213_o0496a_INST_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands (2); the violations are expected. The constraint violations in IBEX_2020_213_o0496a_INST_v001.ccvr (2) are due to contacts not separated by 5 hours and are acceptable.

The PL commands in IBEX_2020_213_o0496a_INST_v001.scr match those in the IBEX_2020_213_o0496a_v002.stf aside from the CEU_SSR_DUMP_NEW command due to the APL contact. This is expected.

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_213_o0495a_BUS_v001.oef and as verified with ibex_orbit.

There is one star tracker outage this orbit. It starts about 1.5 hours after perigee and runs for about 2 hours.

The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit496_Contacts.txt, for all contacts (4).

The inertial precession maneuver at perigee of orbit 495 left us pointing in a safe direction for the orbit 496 arc A ascending and descending sequences:

ibex_rotate -o -u -0.588573,0.745263,0.313313 -w ibex-sun -t 2020/07:31:18:15:26

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. +131.118 Decl. +18.066 (ibex-sun)

error is R.A. +2.818 Decl. +0.193

for a total 2.684 deg

ibex_rotate -o -u -0.588573,0.745263,0.313313 -w ibex-sun -t 2020/08:04:11:50:26

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. +134.676 Decl. +17.138 (ibex-sun)

error is R.A. +6.376 Decl. +1.121

for a total 6.177 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 -0.647738,0.702931,0.293807 -w ibex-sun -t 2020/08:04:13:33:34

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.647738,+0.702931,+0.293807

which is R.A. +132.660 Decl. +17.086

missing R.A. +134.747 Decl. +17.119 (ibex-sun)

error is R.A. +2.087 Decl. +0.033

for a total 1.995 deg

ibex_rotate -o -u -0.647738,0.702931,0.293807 -w ibex-sun -t 2020/08:04:15:08:40

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.647738,+0.702931,+0.293807

which is R.A. +132.660 Decl. +17.086

missing R.A. +134.811 Decl. +17.102 (ibex-sun)

error is R.A. +2.151 Decl. +0.016

for a total 2.056 deg

ibex_rotate -o -u -0.647738,0.702931,0.293807 -w ibex-sun -t 2020/08:09:07:03:13

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.647738,+0.702931,+0.293807

which is R.A. +132.660 Decl. +17.086

missing R.A. +139.366 Decl. +15.776 (ibex-sun)

error is R.A. +6.706 Decl. +1.310

for a total 6.564 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 497 apogee:

ibex_rotate -o -u -0.705841,0.653433,0.273523 -w ibex-sun -t 2020/08:09:11:46:30

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.705841,+0.653433,+0.273523

which is R.A. +137.208 Decl. +15.874

missing R.A. +139.544 Decl. +15.713 (ibex-sun)

error is R.A. +2.336 Decl. +0.161

for a total 2.253 deg

ibex_rotate -o -u -0.705841,0.653433,0.273523 -w ibex-sun -t 2020/08:14:08:01:47

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

points axis +1.000000,+0.000000,+0.000000

towards ECI -0.705841,+0.653433,+0.273523

which is R.A. +137.208 Decl. +15.874

missing R.A. +144.021 Decl. +14.302 (ibex-sun)

error is R.A. +6.813 Decl. +1.572

for a total 6.763 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: Monday, 20 July 2020 at 08:49
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>, "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: RE: IBEX Orbit #496 ATS Approval ( 31 July – 9 Aug 2020 )

Caution - External Email

All,

Attached are the Orbit 496 ATS files with the corrected names. The files have also been placed on the MFT server.

Tim

Timothy E.Perry

CRS IBEX OCO-2

Mission Operations

timothy.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430

From: Perry, Timothy E [US] (IS)
Sent: Thursday, July 16, 2020 4:21 PM
To: 'carol.weaver@unh.edu' <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 #496 ATS Approval ( 31 July – 9 Aug 2020 )

All,

Attached are the planning files for Orbit #496

Please respond to this thread with comments and approvals.

Approvals are required by COB on 20 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 this orbit

No Battery Balancing this orbit

Orbit# 494 Reset Master Timer command

The Master Timer Reset Command is set for 2020/07:22:08:45:00. This command will execute on the following contact for Orbit 494

IBEX,USAK01,ADD,07/22/20,204,08:00:00,07/22/20,204,09:00:00,LAHO 160K IBEX-2 Orbit# 494 SSR_Dump/Tracking Contact 13 asc

APL Contact

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

IBEX,APL-18,ADD,2020-08-09,222,14:00:00,2020-08-09,222,15:00:00,, LAHO 2K-360k Orbit# 496 SSR_Dump Contact Perigee

Command Load Constraint Violation Report (CCVR)

IBEX_2020_213_o0496a_v001.ccvr

We have 2 IBX-CLC-006 Soft Constraint violations. The reason it that there are 2 contacts that are separated by 4 hours and the limit is 5 hours between contacts. These are acceptable,

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

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

SOFT CONSTRAINT VIOLATIONS

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

IBX-CLC-006: Planned transmission at 2020/08/09 13:58:00 UTC - 2020/08/09

15:02:00 UTC is followed by one or more additional transmissions

which, when combined, exceed the maximum transmission time of 5400

seconds within a 18000-second window (total planned transmission

time this window is 7680.000 seconds)

IBX-CLC-006: Planned transmission at 2020/08/09 18:58:00 UTC - 2020/08/09

20:02:00 UTC is preceded by one or more additional transmissions

which, when combined, exceed the maximum transmission time of 5400

seconds within a 18000-second window (total planned transmission

time this window is 7680.000 seconds)

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

transition to science mode at 2020/07/31 15:26:46 UTC

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

transition to science mode at 2020/08/04 14:38:40 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