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Entering orbit…
Habitability
0/ 100
Uninhabitable

TOI-1238 b

Lava WorldUninhabitable230 light years awayFound 2022

TOI-1238 b, from the NASA Exoplanet Archive (found 2022). Measured: 3.76 Earth masses, 0.0139 AU, a 4089 K K-type star. Composition inferred from a measured bulk density of 2.12x Earth's, far too high for silicates alone — an iron-rich world, with a day locked to its 0.8-day year, as anything orbiting this close would be.

Host star

TOI-1238

Type
K-type (Orange)
Spectral type
K7/M0
Temperature
4,089 K
Radius
0.58 ☉
Mass
0.59 ☉
Known planets
2, including this one
Luminosity
0.0827 ☉

Published by the NASA Exoplanet Archive. This world’s temperature and habitability score are computed from this star’s measured luminosity, not from a stand-in for its class.

Lava World

Magnetic FieldExtreme Activity
Why is this a Lava World?Your planet's proximity to its star (0.01 AU) results in extreme surface temperatures of 1264K.
Lava worlds orbit so close to their stars that rocky surfaces melt into oceans of molten rock. Recent planet formation can also create temporary lava worlds.
Classification Criteria:
✓ Temperature: 1264K (>1000K)
Further reading
Exoplanets: Diamond Worlds, Super Earths, Pulsar PlanetsMichael Summers & James TrefilThe strange end of the catalogue — carbon worlds, molten rock, planets orbiting dead stars.Imagined LifeJames Trefil & Michael SummersWhat could live on a world like this one: ice shells, supergravity, tidally locked twilight.The Little Book of ExoplanetsJoshua WinnHow these worlds are found, and what a measurement can honestly tell us.Envisioning ExoplanetsMichael CarrollWhat these worlds might look like from the ground, painted from the same measurements this page renders.
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Habitability ScoreUninhabitable
0
Contributing Factors
temperature0
Inferno world - temperatures exceed all possibility of life
atmosphere10
No atmosphere - exposed to radiation and temperature extremes
water0
No water - the recipe has no hydrogen and oxygen to form it
magnetic Field100
Magnetic field provides radiation protection
geology40
Extreme volcanic activity may be hazardous
Organic Chemistry20
Limited organic chemistry potential
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution

Physical Properties

Mass
3.76x Earth (2.25e+25 kg)
Radius
1.55x Earth (9,907 km)
This planet: 1.55× Earth radiusEarth: 1× (baseline)
Surface Gravity
1.55x Earth (15.3 m/s²)
Surface Temperature
1,264 K (991 °C / 1,816 °F)
Rotation Period
18.4 hours/day (faster than Earth)
This planet: 18 h/dayEarth: 24 h/day

Orbital Environment

Star Type
K-type (Orange)
Distance from Star
0.01 AU (2.08 million km)
Orbital Period
1 day
Time Dilation
Clocks run 23.5 seconds per year slower than deep space — about 31 minutes over a lifetime

Atmosphere

Minimal - too hot to retain

Elemental Composition

Si - Silicon
36.6%
Fe - Iron
24.4%
Mg - Magnesium
12.2%

Surface Characteristics

Molten surface with lava flows, volcanic activity everywhere
The TerraForge exoplanet catalog: 5,572 real exoplanets run through the simulation, with a search field and rendered worlds grouped by type

New: The Exoplanet Catalog 🔭

Every confirmed planet NASA has measured well enough to build — 5,572 of them — is now in here, and none of them arrived with a label. Their real mass, radius, orbit and star go through the same simulation that runs everything you make, and it decides what each one is: gas giant, lava world, ocean, ice. Sixteen come out Earth-like. Find TRAPPIST-1e, stand on its surface, and see what a red dwarf's light actually looks like from the ground.

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