3D moon view · True-scale educational sphere
Explore Io in COSMOS
Jupiter's innermost Galilean moon, shown at its published mean radius and selected-date JPL position. The plain colour is not a spacecraft image of its volcanic surface. The link below opens the explorer, flying the camera to Io with its position set by the archived planetary state.
Measured facts
- Mean radius
- 1,821 kmPublished mean radius stored as renderer geometry.
- Mean diameter
- 3,643 km
- Measured distance from Jupiter
- 419,988 km to 423,535 km
- Closest camera approach
- 1.08 mean radii
What opens when you follow this link
COSMOS opens in the same continuous 3D scene and moves the camera to Io. Nothing reloads, and the breadcrumb trail stays clickable for the way back outward through the Solar System, the measured stellar catalogue and the Galactic view.
If your browser cannot run WebGL2, this page is still the useful part: it carries the identity, the measured values and the provenance, in text.
Where the full record lives
This page is the share link. The complete data record for Io — delivered imagery resolution, observation epoch, source licence, processing chain and every disclosed limitation — is on its reference page, which is linked below.
Datasets behind this page
- JPL Horizons Jupiter-centred Galilean archive (2020–2040)NASA/JPL Horizons · derived-scientific-model · io 0.08333333333333333 d; europa 0.125 d; ganymede 0.25 d; callisto 0.5 d sampling, composed with the same-epoch Jupiter state
- JPL Horizons planetary state archive (2020–2040)NASA/JPL Horizons · derived-scientific-model · One discrete geometric state vector per object at JD 2461281.5 TDB
Content updated 2026-09-26. Every value on this page is computed from the shipped datasets; where a source publishes no value, the page says so instead of estimating one.