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: 284.00 AU, 392K equilibrium
Habitability ScoreUninhabitable
0
Contributing Factors
water93
Abundant 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
Extreme temperature - very difficult for life (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
5.50x Earth (3.28e+25 kg)
Radius
1.77x Earth (11,246 km)
Surface Gravity
1.77x Earth (17.3 m/s²)
Surface Temperature
392 K (118 °C / 245 °F)
Rotation Period
24.0 hours/day
Orbital Environment
Star Type
O-type (Blue Supergiant)
Distance from Star
284.00 AU (42.5 billion km)
Orbital Period
873.8 years
Atmosphere
Volcanic outgassing - sulfur compounds and vaporized rock
Elemental Composition
Ca - Calcium
26.4%
O - Oxygen
22.0%
H - Hydrogen
19.8%
Surface Characteristics
Runaway tidal heating drives volcanism across a cold crust - lava lakes and sulfur plains between frozen plains
Inside the Roche limit (1.92 planet radii): torn apart into a ring system.
Moon 2receding7.9% - 8.4 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Tidal braking locked the planet to its moon: one face forever moonward.
Moon 3merged1.3% - 10.1 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
+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)