arthomnix.dev / ksa_oemloader
Kitten Space Agency mod to load real Artemis II orbit data
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README.md

KSA Artemis OEM Loader#

This is a quick mod for Kitten Space Agency intended to allow loading of real-world orbit data from the Artemis II mission.

It accepts input in the form of CCSDS OEM (Orbit Ephemeris Message) files, although it is very quick and dirty and makes a lot of assumptions about both the files and KSA (in fact, it doesn't read the metadata in the files at all!) These assumptions should be sufficient for loading Artemis II ephemeris data reasonably correctly, but this mod probably won't work with other OEM files (contributions are welcome).

Installation#

Release builds can be downloaded from SpaceDock: https://spacedock.info/mod/4188/Artemis%20OEM%20Loader.

You will also need to install ModMenu from https://spacedock.info/mod/4054/ModMenu, and KittenExtensions from https://spacedock.info/mod/4144/KittenExtensions.

Follow the KSA Modding Wiki's instructions to install.

Usage#

If you are using this mod to track Artemis II, make sure to select the "Earth and Moon (April 2026 lunar ephemerides)" system (provided by this mod) when starting the game instead of the stock systems. This custom system uses up-to-date orbital data for the Moon for Artemis II, so the position of your vehicle relative to the Moon will be much more accurate compared to the stock systems.

To open the OEM loader window, go to Mods > OemLoader > Ephemeris Loader in KSA. Enter the path to your OEM file in the text box, and press "Load OEM file".

OEM files for the Artemis II mission are available from NASA at https://www.nasa.gov/missions/artemis/artemis-2/track-nasas-artemis-ii-mission-in-real-time/. The OEM file is zipped, so you'll need to extract it before loading.

Once you have successfully loaded an OEM file, there will be some more buttons in the GUI. Press "Go to now" to set the orbit of the current vehicle to the orbit from the OEM file at the current real-world time. (Note that time=zero in KSA is actually sometime in November 2025.) Alternatively, use the slider to select a time and press "Go to

Note that the orbit is not automatically updated from the ephemeris after pressing the button, so if you are tracking Artemis in real-time, you will need to periodically press the Go to Now button to keep the orbit accurate.

Note#

This mod has only been tested with the Linux build of KSA, but should work fine on Windows too.