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: 1.32 AU, 421K equilibrium
Habitability ScoreUninhabitable
0
Contributing Factors
water16
Very dry - minimal water - likely as steam
geology40
Extreme volcanic activity may be hazardous
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry80
Core organic elements (CHNO) present
atmosphere16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation)
temperature0
Extremely hot - hostile to known life forms (large moon stabilizes the axial tilt - steady seasons) (runaway tidal heating keeps the surface molten regardless of orbit)
magnetic Field100
Magnetic field provides radiation protection (a large close moon may help stir the core dynamo (speculative))
Physical Properties
Mass
0.80x Earth (4.78e+24 kg)
Radius
0.93x Earth (5,914 km)
Surface Gravity
0.93x Earth (9.1 m/s²)
Surface Temperature
421 K (148 °C / 298 °F)
Rotation Period
23.0 hours/day (faster than Earth)
Orbital Environment
Star Type
F-type (White)
Distance from Star
1.32 AU (197 million km)
Orbital Period
1.33 years
Atmosphere
Volcanic outgassing - sulfur compounds and vaporized rock
Elemental Composition
O - Oxygen
30.2%
Si - Silicon
20.9%
N - Nitrogen
11.6%
Surface Characteristics
Runaway tidal heating drives volcanism across a cold crust - lava lakes and sulfur plains between frozen plains
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Tidal braking locked the planet to its moon: one face forever moonward.
+5 temperature: large moon stabilizes the axial tilt - steady seasons-85 temperature: runaway tidal heating keeps the surface molten regardless of orbit+5 magneticField: a large close moon may help stir the core dynamo (speculative)