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: 65.90 AU, 70K equilibrium
Habitability ScoreUninhabitable
0
Contributing Factors
water60
Water present but mostly frozen
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
Frozen world - minimal potential for complex 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
2.20x Earth (1.31e+25 kg)
Radius
1.30x Earth (8,286 km)
Surface Gravity
1.30x Earth (12.8 m/s²)
Surface Temperature
70 K (-203 °C / -333 °F)
Rotation Period
1.0 hours/day (faster than Earth)
Orbital Environment
Star Type
SNR-type (Supernova Remnant)
Distance from Star
65.90 AU (9.86 billion km)
Orbital Period
452.1 years
Atmosphere
Volcanic outgassing - sulfur compounds and vaporized rock
Elemental Composition
H - Hydrogen
53.8%
He - Helium
32.3%
C - Carbon
5.4%
Surface Characteristics
Runaway tidal heating drives volcanism across a cold crust - lava lakes and sulfur plains between frozen plains
Inside the Roche limit (2.80 planet radii): torn apart into a ring system.
Moon 2merged1.3% - 8.6 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 3receding1.4% - 5.5 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 4receding1.1% - 92.3 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
+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)