Destroyed — no longer habitableMagnetic FieldExtreme Activity
Why is this a Volcanic World?
Runaway tidal heating from its moons drives volcanism across a cold crust - the planet is kneaded like Io.
Resonant, close-in moons pump orbital eccentricity, and the resulting tidal flexing dissipates enormous heat in the interior. Only a fraction of the surface is molten at once, so the ground between the vents stays as cold as the orbit allows - Io's own equilibrium temperature is about 110 K.
Classification Criteria:
✓ Close-in moons in a resonant configuration✓ Tidal heat flux beyond the runaway threshold- The orbit is not what melted it: 2.15 AU, 192K equilibrium
Habitability
Destroyed — no longer habitable
Physical Properties
Mass
23.00x Earth (1.37e+26 kg)
Radius
2.84x Earth (18,118 km)
Surface Gravity
2.84x Earth (27.9 m/s²)
Surface Temperature
192 K (-81 °C / -114 °F)
Rotation Period
1.0 hours/day (faster than Earth)
Orbital Environment
Star Type
G-type (Yellow (Sun-like))
Distance from Star
2.15 AU (322 million km)
Orbital Period
3.15 years
Atmosphere
Volcanic outgassing - sulfur compounds and vaporized rock
Elemental Composition
O - Oxygen
25.8%
H - Hydrogen
16.3%
Fe - Iron
11.5%
Surface Characteristics
Runaway tidal heating drives volcanism across a cold crust - lava lakes and sulfur plains between frozen plains