Artemis II Mission Tracker

Interactive 3D visualization and physics simulator for NASA's Artemis II lunar flyby mission.

Live demo: fajrul.com/artemis-ii

• web/index.html: Plays back the real Artemis II trajectory from JPL Horizons data.
• web/simulation.html: Live physics sandbox: tweak velocity, altitude, and Moon angle, and see the trajectory.

See Physics.md for the math.

Credits

• Inspired by Javilop's Artemis II Tracker.
• Orion 3D model by DeltaX on Cults3D.
• Big thanks to Claude for doing most of the heavy lifting on the code.

Files

core.py              # Reference Python simulator (Earth + Moon gravity)
data/                # JPL Horizons ephemeris files (real mission data)
utilities/           # Python scripts for parsing & plotting
web/                 # Browser visualizations (Three.js)

data/

• artemis_ephemeris.txt: Real Artemis II position & velocity over time.
• moon_ephemeris.txt: Moon position & velocity over the same period.

utilities/

• export_trajectory_js.py: Converts ephemeris → web/trajectory.js.
• detect_maneuvers.py: Finds engine burns by comparing observed vs. expected gravity.
• plot_trajectory_interactive.py: 3D plot of spacecraft + Moon + Earth.
• plot_artemis_earth.py: 3D plot of spacecraft + Earth only.
• plot_acceleration.py: Trajectory colored by acceleration.
• plot_velocity.py: Trajectory colored by speed.
• plot_maneuvers.py: Trajectory with detected burns highlighted.

web/

• index.html: Real mission viewer.
• simulation.html: Interactive physics sandbox.
• trajectory.js: Auto-generated trajectory data.
• orion.stl: 3D model of the Orion spacecraft.

Run

# View web pages
cd web && python3 -m http.server 8000
# open http://localhost:8000/index.html
# open http://localhost:8000/simulation.html

# Run Python scripts
pip install numpy scipy matplotlib
python3 core.py