Habitability

40/ 100

Marginal

Nepton

by Krimm

Barren

Magnetic FieldHigh Activity

Why is this a Barren?Your planet has an unusual composition that doesn't fit standard classifications, or lacks the elements needed for complex geological processes.

Barren worlds can form from uncommon element combinations or may be remnants of larger bodies that lost their atmospheres and volatile materials.

Classification Criteria:

Composition doesn't match standard planet typesMass: 3.0x EarthTemperature: 259K

Habitability ScoreMarginal

Contributing Factors

water20

Very dry - minimal water

geology90

Active geology recycles nutrients and drives carbon cycle

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 (tidal pools cycle wet and dry - a boost for prebiotic chemistry)

atmosphere28

Nitrogen atmosphere provides protection but not breathable (partially stripped by slow rotation)

temperature75

Challenging but potentially habitable temperature (large moon stabilizes the axial tilt - steady seasons)

magnetic Field100

Magnetic field provides radiation protection (a large close moon may help stir the core dynamo (speculative))

Physical Properties

Mass

3.00x Earth (1.79e+25 kg)

Radius

1.44x Earth (9189 km)

Surface Gravity

1.44x Earth (14.1 m/s²)

Surface Temperature

259 K (-15 °C / 6 °F)

Rotation Period

32.0 hours/day (slower than Earth)

Orbital Environment

Star Type

O-type (Blue Supergiant)

Distance from Star

365.40 AU (54.7 billion km)

Atmosphere

Thin CO₂ and nitrogen atmosphere

Elemental Composition

C - Carbon

27.8%

P - Phosphorus

27.8%

S - Sulfur

13.9%

Surface Characteristics

Barren rocky surface with unusual elemental composition

Closest Real Exoplanet

KMT-2021-BLG-0912L b70% similar

Orbiting KMT-2021-BLG-0912L

	Yours	KMT-2021-BLG-0912L b
Mass	3.00 × Earth	2.81 × Earth
Radius	1.44 × Earth	1.49 × Earth
Temperature	258.6 K	—
Starlight received	0.75 × Earth	—
Star temperature	35,000 K	—

Discovered 2022 via microlensing · 18,134 light-years awaySource: NASA Exoplanet Archive

Moons

Moon 1rings0.080% - 6.0 radii

Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).

Moon 2receding0.12% - 12.2 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 3receding1.0% - 22.5 radii

Outside the synchronous orbit: slowly receding, like Luna (~cm per year).

+5 temperature: large moon stabilizes the axial tilt - steady seasons+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry+5 magneticField: a large close moon may help stir the core dynamo (speculative)