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Entering orbit…
Habitability
58/ 100
Marginal

TOI-4336 A b

Water WorldMarginal73 light years awayFound 2024

TOI-4336 A b, from the NASA Exoplanet Archive (found 2024). Measured: 3.33 Earth masses, 0.0849 AU, a 3307 K M-type star. Composition inferred from a measured bulk density of 0.34x Earth's — too light for bare rock, so a large fraction of water and ice, with a day locked to its 16.3-day year, as anything orbiting this close would be.

Host star

TOI-4336 A

Type
M-type (Red Dwarf)
Spectral type
M3.5 V
Temperature
3,307 K
Radius
0.326 ☉
Mass
0.306 ☉
Known planets
2, including this one
Luminosity
0.0110 ☉

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.

Water World

Life DetectedHigh Activity
Why is this a Water World?Your planet has abundant oxygen (41.2%) and hydrogen (17.6%), creating extensive water coverage while in the habitable temperature zone.
Water worlds have deep global oceans covering most or all of their surface. They form when planets have high water content and orbit in the habitable zone.
Classification Criteria:
✓ Oxygen: 41.2% + Hydrogen: 17.6% (water-forming elements)✓ Temperature: 333K (habitable range)✓ Distance: 0.08 AU (habitable zone)
Further reading
Imagined LifeJames Trefil & Michael SummersWhat could live on a world like this one: ice shells, supergravity, tidally locked twilight.Envisioning ExoplanetsMichael CarrollWhat these worlds might look like from the ground, painted from the same measurements this page renders.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.
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Habitability ScoreMarginal
58
Contributing Factors
temperature70
Challenging but potentially habitable temperature
atmosphere60
Nitrogen-oxygen atmosphere - breathable and protective (partially stripped by slow rotation)
water100
Abundant water
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
333 K (59 °C / 139 °F)
Rotation Period
391.2 hours/day (slower than Earth)
This planet: 391 h/dayEarth: 24 h/day

Orbital Environment

Star Type
M-type (Red Dwarf)
Distance from Star
0.08 AU (12.7 million km)
Orbital Period
16 days

Atmosphere

Nitrogen and oxygen with water vapor, mild greenhouse effect

Elemental Composition

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

Surface Characteristics

Vast oceans covering most of the surface, scattered islands or archipelagos

Habitability

✓ Conditions suitable for life detectedThis planet exhibits the necessary conditions to support biological processes, including stable temperatures, liquid water, and protective magnetic fields.
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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