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How to explore Orbital Velocity 3D Explorer
Open the Orbital Velocity 3D Explorer, watch speed change along the ellipse, and read Vis-viva km/s with periapsis and apoapsis markers in the facts panel.
- Open https://freetoolonline.com/space-3d/orbital-velocity.html and wait for the star, elliptical path, and orbiting body.
- Read the facts panel: Vis-viva v = sqrt(GM(2/r - 1/a)) and live km/s readout.
- Press Mercury for ~47.36 km/s mean speed or Earth for ~29.78 km/s or Neptune for ~5.43 km/s.
- Watch the yellow velocity arrow - fastest near the green periapsis marker, slowest near red apoapsis.
- Drag the eccentricity slider to deepen the ellipse and see a wider periapsis/apoapsis speed contrast.
Orbital velocity key figures
| Planet | Mean orbital speed |
|---|---|
| Mercury | ~47.36 km/s |
| Earth | ~29.78 km/s |
| Neptune | ~5.43 km/s |
Next: the when guide or vs alternatives. Open the Orbital Velocity 3D Explorer.
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