No life — too cold for liquid waterExtreme 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: 0.13 AU, 244K equilibrium
Habitability ScoreUninhabitable
0
Contributing Factors
water15
Very dry - minimal water - 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 Chemistry100
All CHNOPS elements present - building blocks of life
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 Field35
No magnetic field - vulnerable to solar radiation (a large close moon may help stir the core dynamo (speculative))
Physical Properties
Mass
0.10x Earth (5.97e+23 kg)
Radius
0.46x Earth (2,957 km)
Surface Gravity
0.46x Earth (4.6 m/s²)
Surface Temperature
244 K (-29 °C / -21 °F)
Rotation Period
3.0 hours/day (faster than Earth)
Orbital Environment
Star Type
NS-type (Neutron Star)
Distance from Star
0.13 AU (19.4 million km)
Orbital Period
14 days
Time Dilation
Clocks run 5.0 seconds per year slower than deep space — about 7 minutes over a lifetime
Atmosphere
Volcanic outgassing - sulfur compounds and vaporized rock
Elemental Composition
Fe - Iron
13.1%
Ca - Calcium
10.7%
Ni - Nickel
9.5%
Surface Characteristics
Runaway tidal heating drives volcanism across a cold crust - lava lakes and sulfur plains between frozen plains
Matched on physical properties only — but pulsar planets are real: the first exoplanets ever confirmed (PSR B1257+12, 1992) orbit a neutron star.Discovered 2025 via radial velocity · 4 light-years awaySource: NASA Exoplanet Archive
Inside the Roche limit (2.80 planet radii): torn apart into a ring system.
Moon 2rings0.00025% - 2.8 radii
Inside the Roche limit (2.80 planet radii): torn apart into a ring system.
Moon 3rings0.00010% - 2.3 radii
Inside the Roche limit (2.80 planet radii): torn apart into a ring system.
Moon 4receding0.00010% - 4.3 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 5merged10% - 6.5 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)