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: 229.10 AU, 198K equilibrium
Habitability ScoreUninhabitable
0
Contributing Factors
water37
Abundant water - frozen solid, no liquid phase at this temperature
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
Very cold - water frozen, challenging 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
85.00x Earth (5.08e+26 kg)
Radius
4.40x Earth (28,012 km)
Surface Gravity
4.40x Earth (43.1 m/s²)
Surface Temperature
198 K (-76 °C / -104 °F)
Rotation Period
20.0 hours/day (faster than Earth)
Orbital Environment
Star Type
B-type (Blue Giant)
Distance from Star
229.10 AU (34.3 billion km)
Orbital Period
1,097 years
Atmosphere
Volcanic outgassing - sulfur compounds and vaporized rock
Elemental Composition
O - Oxygen
41.2%
H - Hydrogen
17.6%
N - Nitrogen
11.8%
Surface Characteristics
Runaway tidal heating drives volcanism across a cold crust - lava lakes and sulfur plains between frozen plains
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 2stable0.00089% - 11.7 radii
Small and distant: a quiet, stable companion.
Tidal braking locked the planet to its moon: one face forever moonward.
Moon 3stable0.00071% - 9.9 radii
Small and distant: a quiet, stable companion.
Moon 4stable0.00040% - 12.5 radii
Small and distant: a quiet, stable companion.
Moon 5receding0.00035% - 14.5 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Moon 6receding0.056% - 100.0 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Moon 7rings0.010% - 3.6 radii
Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).
+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)