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Entering orbit…
Habitability
0/ 100
Uninhabitable

Kepler-1339 b

Lava WorldUninhabitable1209 light years awayFound 2016

Kepler-1339 b, from the NASA Exoplanet Archive (found 2016). Measured: 0.285 Earth masses, 0.0236 AU, a 5586 K G-type star. Composition inferred from a measured bulk density of 0.80x Earth's, which is rock and iron, with a day locked to its 1.3-day year, as anything orbiting this close would be.

Host star

Kepler-1339

Type
G-type (Yellow (Sun-like))
Temperature
5,586 K
Radius
0.93 ☉
Mass
0.94 ☉
Known planets
1 (this one)
Luminosity
1.54 ☉

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

Extreme Activity
Why is this a Lava World?Your planet's proximity to its star (0.02 AU) results in extreme surface temperatures of 2016K.
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: 2016K (>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
water8
Limited water content - boiling away, little would be retained
magnetic Field30
No magnetic field - vulnerable to solar radiation
geology40
Extreme volcanic activity may be hazardous
Organic Chemistry80
Core organic elements (CHNO) present
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution

Physical Properties

Mass
0.28x Earth (1.70e+24 kg)
Radius
0.66x Earth (4,193 km)
This planet: 0.66× Earth radiusEarth: 1× (baseline)
Surface Gravity
0.66x Earth (6.5 m/s²)
Surface Temperature
2,016 K (1,743 °C / 3,169 °F)
Rotation Period
32.2 hours/day (slower than Earth)
This planet: 32 h/dayEarth: 24 h/day

Orbital Environment

Star Type
G-type (Yellow (Sun-like))
Distance from Star
0.02 AU (3.53 million km)
Orbital Period
1 day
Time Dilation
Clocks run 19.8 seconds per year slower than deep space — about 26 minutes over a lifetime

Atmosphere

Minimal - too hot to retain

Elemental Composition

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

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

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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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