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Entering orbit…
Habitability
19/ 100
Uninhabitable

K2-149 b

Rocky TerrestrialUninhabitable404 light years awayFound 2018

K2-149 b, from the NASA Exoplanet Archive (found 2018). Measured: 3.33 Earth masses, 0.083 AU, a 3745 K K-type star. Composition inferred from a measured bulk density of 0.75x Earth's, which is rock and iron, with a day locked to its 11.3-day year, as anything orbiting this close would be.

Host star

K2-149

Type
K-type (Orange)
Spectral type
M1.0 V
Temperature
3,745 K
Radius
0.568 ☉
Mass
0.595 ☉
Known planets
1 (this one)
Luminosity
0.0490 ☉

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.

Rocky Terrestrial

High Activity
Why is this a Rocky Terrestrial?Your planet is dominated by silicate (25.0%) and iron (12.5%) content, forming a rocky terrestrial body.
Rocky terrestrial planets are primarily composed of silicate rocks and metals. They're the most common type of small planet in the universe.
Classification Criteria:
✓ Silicon: 25.0% + Iron: 12.5% + Magnesium: 3.8%✓ Mass: 3.3x Earth (terrestrial range)
Further reading
The Little Book of ExoplanetsJoshua WinnHow these worlds are found, and what a measurement can honestly tell us.Exoplanets: Diamond Worlds, Super Earths, Pulsar PlanetsMichael Summers & James TrefilThe strange end of the catalogue — carbon worlds, molten rock, planets orbiting dead stars.Envisioning ExoplanetsMichael CarrollWhat these worlds might look like from the ground, painted from the same measurements this page renders.Imagined LifeJames Trefil & Michael SummersWhat could live on a world like this one: ice shells, supergravity, tidally locked twilight.
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Habitability ScoreUninhabitable
19
Contributing Factors
temperature15
Extremely hot - hostile to known life forms
atmosphere42
Nitrogen atmosphere provides protection but not breathable (partially stripped by slow rotation)
water34
Limited water content - likely as steam
magnetic Field30
No magnetic field - vulnerable to solar radiation
geology90
Active geology recycles nutrients and drives carbon cycle
Organic Chemistry80
Core organic elements (CHNO) present
rotation30
Very slow rotation - extreme temperature swings between eternal day and night sides

Physical Properties

Mass
3.33x Earth (1.99e+25 kg)
Radius
1.49x Earth (9,514 km)
This planet: 1.49× Earth radiusEarth: 1× (baseline)
Surface Gravity
1.49x Earth (14.6 m/s²)
Surface Temperature
461 K (187 °C / 369 °F)
Rotation Period
271.2 hours/day (slower than Earth)
This planet: 271 h/dayEarth: 24 h/day

Orbital Environment

Star Type
K-type (Orange)
Distance from Star
0.08 AU (12.4 million km)
Orbital Period
10 days

Atmosphere

Thin CO₂ and nitrogen atmosphere

Elemental Composition

O - Oxygen
31.3%
Si - Silicon
25.0%
Fe - Iron
12.5%

Surface Characteristics

Rocky surface with impact craters, possible volcanic features
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