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Entering orbit…
Habitability
0/ 100
Uninhabitable

K2-55 b

Ice GiantUninhabitable522 light years awayFound 2016

K2-55 b, from the NASA Exoplanet Archive (found 2016). Measured: 44 Earth masses, 0.0349 AU, a 4300 K K-type star. Composition inferred from a measured bulk density of 0.51x Earth's — too light for bare rock, so a large fraction of water and ice, with a day locked to its 2.9-day year, as anything orbiting this close would be.

Host star

K2-55

Type
K-type (Orange)
Temperature
4,300 K
Radius
0.715 ☉
Mass
0.688 ☉
Known planets
1 (this one)
Luminosity
0.164 ☉

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.

Ice Giant

Magnetic FieldExtreme Activity
Why is this a Ice Giant?Your planet has moderate mass (44.0x Earth) with significant water, carbon, and nitrogen content, characteristic of ice giants.
Ice giants like Uranus and Neptune have icy interiors with thick atmospheres of hydrogen and helium, but not enough to be classified as gas giants.
Classification Criteria:
✓ Mass: 44.0x Earth (5-20x range)✓ Water/Carbon/Nitrogen rich composition
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.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.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
0
Contributing Factors
temperature0
Inferno world - temperatures exceed all possibility of life
atmosphere30
Hydrogen-rich atmosphere typical of gas giants
water15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
magnetic Field100
Magnetic field provides radiation protection
geology40
Extreme volcanic activity may be hazardous
Organic Chemistry80
Core organic elements (CHNO) present
rotation65
Slow rotation - significant day/night temperature variations, but life can adapt

Physical Properties

Mass
44.00x Earth (2.63e+26 kg)
Radius
3.53x Earth (22,492 km)
This planet: 3.53× Earth radiusEarth: 1× (baseline)
Surface Gravity
3.53x Earth (34.6 m/s²)
Surface Temperature
1,019 K (746 °C / 1,375 °F)
Rotation Period
68.4 hours/day (slower than Earth)
This planet: 68 h/dayEarth: 24 h/day

Orbital Environment

Star Type
K-type (Orange)
Distance from Star
0.03 AU (5.22 million km)
Orbital Period
3 days
Time Dilation
Clocks run 9.4 seconds per year slower than deep space — about 12 minutes over a lifetime

Atmosphere

Hydrogen and helium with water, methane, and ammonia ices

Elemental Composition

O - Oxygen
41.2%
H - Hydrogen
17.6%
Si - Silicon
11.8%

Surface Characteristics

No solid surface - a deep volatile envelope over a supercritical water mantle and hot-ice interior
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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