Hyperion is the largest irregular moon of Saturn - a porous, sponge-textured body that tumbles chaotically as it orbits. Press play to watch the tumble, toggle Chaos for a steadier spin comparison, and read the cited size and porosity figures.
Published figures: axes ~410 x 260 x 220 km (NASA); mean radius ~135 km; density ~540 kg/m3 with porosity >40%; discovered 16 Sep 1848.
Drag to orbit and scroll or pinch to zoom. Press Play or toggle Chaos.
Related Saturn explorers: Mimas Herschel Crater 3D Explorer and Iapetus Equatorial Ridge 3D Explorer. Walk the step-by-step guide.
Hyperion Sponge Moon 3D Explorer
Hyperion is the largest of the irregular Saturn, nonspherical moons. NASA Science cites axes about 410 by 260 by 220 kilometers with a mean radius near 135 kilometers. Its density is only slightly more than half that of water - about 540 kilograms per cubic meter in Cassini-era mass determinations - which implies porosity above 40 percent. That porous interior helps explain a surface packed with deep, well-preserved craters that look like a sponge or wasp nest at kilometer scales.
Hyperion also rotates chaotically: the spin axis tumbles so that orientation is unpredictable on timescales of weeks, driven by an irregular shape, an eccentric orbit about 1.5 million kilometers from Saturn, and a resonance with Titan. William Bond, George Bond, and William Lassell discovered the moon on 16 September 1848. This explorer shows a schematic potato body, sponge pits, and a Chaos tumble toggle - not a Cassini DEM and not an N-body integrator.
- Irregular Hyperion ellipsoid with schematic sponge pits
- Toggleable chaotic tumble versus steadier spin
- Titan in the background for resonance context (not to scale)
- Speed slider and Play/Pause
- Runs fully in the browser with the vendored three.js engine - no account, no upload
Anyone comparing icy moons gets a concrete sense of porosity-driven crater preservation and chaotic rotation.
| Figure | Value | Source note |
|---|---|---|
| Axes | ~410 x 260 x 220 km | NASA Science Hyperion page |
| Mean radius | ~135 km | NASA / PDS |
| Density | ~540 kg/m3 (Nature ~544+/-50) | Thomas et al. 2007 |
| Porosity | >40% | NASA; Nature 2007 |
| Orbit distance | ~1.5 million km | NASA |
| Discovered | 16 Sep 1848 | Bond / Lassell |
Everything renders on your device with WebGL. The 3D engine loads once (about 0.7 MB) and is cached; no scene data is sent to a server.
This is an educational visualization - pit depth and tumble rates are exaggerated for readability. Some shape catalogs list slightly different axes than the NASA summary; ranges are disclosed rather than forced to one number.
For a step-by-step walkthrough, read the Hyperion Sponge Moon 3D Explorer step-by-step guide. The Space 3D collection also includes Mimas Herschel Crater 3D Explorer and Iapetus Equatorial Ridge 3D Explorer for related Saturn-moon context.
Frequently Asked Questions
Why does Hyperion look like a sponge?
High porosity (above 40 percent) means impacts tend to compress rather than excavate and throw ejecta, so many mid-size craters stay deep and sharp - a sponge or wasp-nest look at kilometer scales (Cassini / Nature 2007).
What is chaotic rotation?
The spin axis tumbles so orientation is unpredictable on timescales of weeks. Hyperion is a classic example among planetary moons, tied to its irregular shape, eccentric orbit, and Titan resonance.
What do Play, Chaos, and Speed do?
Play starts or pauses motion. Chaos toggles schematic tumble versus a steadier spin. Speed changes how fast the animation runs.
Is this a real Cassini terrain model?
No. It is a procedural schematic grounded in published sizes. Pits and tumble are exaggerated for visibility.
How big is Hyperion?
NASA cites about 410 x 260 x 220 km along its axes, with mean radius near 135 km. Some shape models list slightly different axes - the page shows the NASA summary and notes variance.