All,

I found the issue for why the IBX-CLC-015 Error was incorrect. I found that I had a corrupted history file. The history remembers the spacecraft configuration from the previous ATS generation. This way it can perform checks like power usage & start with a known spacecraft state. I deleted the current history file and regenerated and saved a couple orbits of data. Now we are seeing the correct response for the eclipse on Dec 15 2020.

IBX-CLC-015: Battery charge falls below minimum from 2020/12/15 13:31:55 UTC -

2020/12/15 15:08:41 UTC. Lowest charge level is 6033.143131

watt-minutes during this interval.

Attached are the new CCVR files for Orbit 510. The Version 1 ATS’s are fine for the checkoff.

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, November 19, 2020 4:56 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) <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 <angoldconsulting@earthlink.net>; Paul Janzen <Paul.Janzen@mso.umt.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 #510 ATS Approval (7 – 16 Dec 20)

All,

Attached are the planning files for Orbit #510

Please respond to this thread with comments and approvals.

Approvals are required by COB on 26 November 2020

Please note the following:

1. Please note that I am moving out the date for sign off to the perigee passes. I plan to uplink the Orbit 509 LGC ATS during the apogee pass on Nov 22.

2. The Apogee pass had to be changed. With the new ephemeris the original view period disappeared

IBEX,USHI01,DELETE,12/12/20,347,02:30:00,12/12/20,347,03:05:00,LAHO 2K IBEX-2 Orbit# 510 Apogee Tracking Contact 42re Desc

IBEX,USHI01,ADD,12/13/20,348,00:30:00,12/13/20,348,01:05:00,LAHO 2K IBEX-2 Orbit# 510 Apogee Tracking Contact 42re Desc

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.

6. Eclipse – Eclipse Duration 2020-12-15T12:37:55.730Z,PenumbraEntry,orbit:510 - 2020-12-15T14:00:41.598Z,PenumbraExit,orbit:510

Long eclipse flag 2020/12:15:10:45:00 True - 2020/12:15:14:10:00 False

7. Orbit# 510 Reset Master Timer - 2020/11:28:00:15:00

8. Command Load Constraint Violation Report (CCVR)

IBEX_2020_341_o0510a_v001.ccvr

# Input files: 1

# IBEX_2020_341_o0510a_v001.scr

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

HARD CONSTRAINT VIOLATIONS

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

NO VIOLATIONS.

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

SOFT CONSTRAINT VIOLATIONS

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

IBX-CLC-006: Planned transmission at 2020/12/15 10:28:00 UTC - 2020/12/15

12:02:00 UTC exceeds the maximum contiguous transmission time of

5400 seconds

The reason for this violation is that we add 2 minutes before and after the scheduled time. So, the additional 4 minutes creates the violation.

IBEX,USAK01,ADD,12/15/20,350,10:30:00,12/15/20,350,12:00:00,LAHO 64K IBEX-2 Orbit# 510 Pre-Eclipse Monitor Contact 14 Desc

IBX-CLC-015: Battery charge falls below minimum from 2020/12/06 18:30:00 UTC -

2020/12/15 23:32:00 UTC. Lowest charge level is 0.000000

watt-minutes during this interval.

I am assuming that this violation is because of the eclipse. I am not sure why the duration is the length of the orbit.

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

transition to science mode at 2020/12/07 01:46:26 UTC

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

transition to science mode at 2020/12/12 02:37:37 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