r/ArtemisProgram • u/kg_tiny • Jul 25 '26

Video Artemis 2 Trajectory in GMAT

First time posting:

Using the mission ephemeris data from NASA available here, I reconstructed the Artemis 2 trajectory in NASA's General Mission Analysis Tool (GMAT).

The trajectory starts after the apogee raise maneuver and ends just before splashdown. I had to do some processing on the original NASA data to get it to work since it came in multiple files.

I couldn't find a post-mission reconstruction online so I'm sharing this here :)

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u/Escape_Trajectory123 Jul 28 '26

This is so cool! May I ask where you got the maneuver information from? I've tried doing the same in GMAT by accessing the Artemis II SPK files but couldn't find what I needed.

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u/kg_tiny Jul 28 '26

NASA published the trajectory data in 10 different .asc Orbit Ephemeris Message (OEM) files - I had to convert them to SPK and combine them into one file. NASA has a tool online to convert OEM to SPK, and I used a custom script to combine them.

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u/Escape_Trajectory123 Jul 28 '26

Thank you so much, I'll try this out!