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Entering orbit…
Habitability
4/ 100
Uninhabitable

Kepler-444 f

Rocky TerrestrialUninhabitable119 light years awayFound 2015

Kepler-444 f, from the NASA Exoplanet Archive (found 2015). Measured: 0.332 Earth masses, 0.0811 AU, a 5046 K K-type star. Composition inferred from a measured bulk density of 0.82x Earth's, which is rock and iron, with a day locked to its 9.7-day year, as anything orbiting this close would be.

Host star

Kepler-444

Type
K-type (Orange)
Spectral type
K
Temperature
5,046 K
Radius
0.752 ☉
Mass
0.758 ☉
Known planets
5, including this one
Luminosity
0.376 ☉

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

Low 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: 0.3x 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
4
Contributing Factors
temperature5
Scorching - hot enough to melt lead, though rock stays solid; no chance for life
atmosphere6
No atmosphere - exposed to radiation and temperature extremes (partially stripped by slow rotation)
water8
Limited water content - boiling away, little would be retained
magnetic Field30
No magnetic field - vulnerable to solar radiation
geology60
Some geological activity provides slow nutrient cycling
Organic Chemistry80
Core organic elements (CHNO) present
rotation30
Very slow rotation - extreme temperature swings between eternal day and night sides

Physical Properties

Mass
0.33x Earth (1.98e+24 kg)
Radius
0.69x Earth (4,412 km)
This planet: 0.69× Earth radiusEarth: 1× (baseline)
Surface Gravity
0.69x Earth (6.8 m/s²)
Surface Temperature
764 K (491 °C / 916 °F)
Rotation Period
233.8 hours/day (slower than Earth)
This planet: 234 h/dayEarth: 24 h/day

Orbital Environment

Star Type
K-type (Orange)
Distance from Star
0.08 AU (12.1 million km)
Orbital Period
10 days

Atmosphere

Minimal or none

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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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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