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Entering orbit…
Habitability
0/ 100
Uninhabitable

TRAPIST-1657+77889 622 b and c

0

Brown Dwarf

Magnetic FieldNone Activity
Why is this a Brown Dwarf?Your planet has an unusual composition that doesn't fit standard classifications, or lacks the elements needed for complex geological processes.
Barren worlds can form from uncommon element combinations or may be remnants of larger bodies that lost their atmospheres and volatile materials.
Classification Criteria:
Composition doesn't match standard planet typesMass: 6356.0x EarthTemperature: 1259K
Habitability ScoreUninhabitable
0
Contributing Factors
water15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
geology40
Geologically dead - no nutrient recycling (tidal flexing sustains geologic activity)
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry100
All CHNOPS elements present - building blocks of life
atmosphere12
Hydrogen-rich atmosphere typical of gas giants (partially stripped by slow rotation)
temperature0
Inferno world - temperatures exceed all possibility of life
magnetic Field100
Magnetic field provides radiation protection

Physical Properties

Mass
6356.00x Earth (3.80e+28 kg)
Radius
18.52x Earth (118,015 km)
This planet: 18.52× Earth radiusEarth: 1× (baseline)
Surface Gravity
18.52x Earth (181.7 m/s²)
Surface Temperature
1,259 K (986 °C / 1,806 °F)
Rotation Period
5.0 hours/day (faster than Earth)
This planet: 5 h/dayEarth: 24 h/day

Orbital Environment

Star Type
M-type (Red Dwarf)
Distance from Star
12.00 AU (1.8 billion km)
Orbital Period
75.9 years

Atmosphere

Hydrogen and helium dominated by methane absorption, with water clouds below

Elemental Composition

H - Hydrogen
28.5%
He - Helium
17.3%
C - Carbon
15.9%

Surface Characteristics

No surface: a cooling failed star, its methane atmosphere absorbing so much red light it would look magenta to the eye

Closest Real Exoplanet

VHS J125601.92-125723.9 b78% similar
Orbiting VHS J125601.92-125723.9
YoursVHS J125601.92-125723.9 b
Mass6,356 × Earth5,090 × Earth
Radius18.5 × Earth13.7 × Earth
Density (composition)— 10.9 g/cm³
Temperature1,259 K1,194 K
Starlight received0.00 × Earth—
Star temperature3,050 K2,620 K
Discovered 2015 via imaging · 41 light-years awaySource: NASA Exoplanet Archive
Moons
Moon 1stableOcean world0.0045% - 5.4 radii

Small and distant: a quiet, stable companion.

Tidal braking locked the planet to its moon: one face forever moonward.

A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (19/100).

Moon 2merged0.040% - 5.8 radii

Merged with an adjacent moon: too close for both to hold a stable orbit.

Moon 3stableOcean world0.010% - 4.3 radii

Small and distant: a quiet, stable companion.

A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (27/100).

+10 geology: tidal flexing sustains geologic activity
Surface views from three worlds: rocky ground under a ringed sky, a cloud deck, and a lit desert

New: Stand on Your World 🏔️

Every planet you build can now be seen from the ground. The terrain, the color of the sky, the weather and what hangs overhead are all read from the same numbers that shape the globe — so a thin-aired world gives you sunlit rock under a near-black sky crowded with stars, a runaway greenhouse seals you under an unbroken sulfur lid, and a gas giant leaves you in the cloud tops with nothing solid beneath you at all. If one of your moons wandered inside the Roche limit, what is left of it arcs overhead as rings.

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