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Entering orbit…
Habitability
0/ 100
Uninhabitable
WD 1856+534 b rendered in TerraForge from its measured mass, orbit and star

WD 1856+534 b

Also written WD 1856+534b

Brown Dwarf81 light years awayFound 2020
Mass
4390.00 × Earth
Radius
10.40 × Earth
Gravity
40.59 g
Surface (est.)
391 K
Year
33.8 hrs
From Earth
80.6 ly
Mass
4390.00 × Earth
Radius
10.40 × Earth
Gravity
40.59 g
Surface (est.)
391 K
Year
33.8 hrs
From Earth
80.6 ly

WD 1856+534 system

Type
White dwarf
Spectral type
DC
Temperature
4,710 K
Radius
0.0131 ☉
Mass
0.518 ☉
Planets
1
Luminosity
7.59e-5 ☉

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.

WD 1856+534 b0.020 AUYou are here4,390 M⊕
Habitable zone

Star and planets drawn to scale: WD 1856+534 b is 7.3 times as wide as its star. Orbits spaced as in the star system view.

WD 1856+534 b, from the NASA Exoplanet Archive (found 2020). Measured: 4390 Earth masses, 0.0204 AU, a 4710 K K-type star. Composition inferred from a mass of 4390 Earths, which is giant territory whatever its 3.90x density suggests, with a day locked to its 1.4-day year, as anything orbiting this close would be. Note: TerraForge comes out at 391 K against the archive's 163 K, because it models stars by spectral class, and WD 1856+534 is not an average K-type.

Surface. No surface: the coldest class of failed star, barely warmer than a summer day and glowing only in the infrared

Brown Dwarf
Magnetic FieldNone Activity
WD 1856+534 b 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: 4390.0x EarthTemperature: 391K

Reading WD 1856+534 b’s atmosphere

Dominant elements: H, He, O, C, NThis is what a telescope would measure while WD 1856+534 b crosses in front of its star: starlight passes through the atmosphere and spreads into a rainbow band. Each dark line marks a wavelength the atmosphere absorbed.Every element absorbs its own signature wavelengths — hydrogen always darkens the same two spots, calcium another pair, and so on. Astronomers match the lines in a real spectrum against a library of these signatures to say what an atmosphere is made of, light-years away, without ever visiting. A deeper line generally means more of that element is present.WD 1856+534 b sits about 81 light-years away, found by the transit method. Most catalogued distances trace back to parallax: as Earth orbits the Sun, a nearby star appears to shift very slightly against the distant background stars, and the size of that shift gives its distance directly.
Further reading
ExoplanetsSara Seager (editor)The field's standard reference: how planets are found, how they form, and what their atmospheres are made of.The Planet FactoryElizabeth TaskerHow planets are made, and why so few of them come out like Earth.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.
As an Amazon Associate I earn from qualifying purchases — if you buy through these links, TerraForge may receive a small commission at no extra cost to you.
Habitability ScoreUninhabitable
0
Contributing Factors
temperature14
Extremely hot - hostile to known life forms
atmosphere30

Cold hydrogen and helium with ammonia and water clouds

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 Field20
A strong field, but no surface beneath it — there is nothing here for it to shelter
geology30
Geologically dead - no nutrient recycling
Organic Chemistry80
Core organic elements (CHNO) present
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution

Physical Properties

Mass
4390.00x Earth (2.62e+28 kg)
Radius
16.37x Earth (104,319 km)
This planet: 16.37× Earth radiusEarth: 1× (baseline)
Surface Gravity
16.37x Earth (160.6 m/s²)
Surface Temperature
391 K (118 °C / 245 °F)
Rotation Period
33.8 hours/day (slower than Earth)
This planet: 34 h/dayEarth: 24 h/day

Time Dilation

Clocks run 16.0 seconds per year slower than deep space — about 21 minutes over a lifetime

Elemental Composition

A dark ringed planet hanging over the horizon of a rocky moon, its rings lit by a distant sun

New: Stand on Your Moons 🌒

A planet's surface view isn't the only ground any more. Press the surface button on a planet with moons and it asks where to stand: the planet itself, or any moon still in orbit, each tagged with what it became — ocean, ice, carbon, volcanic. Every moon gets its own ground and sky from its own physics: airless rock under a black sky, ice cracked by geysers over a hidden sea, sulfur plains shaking with eruptions, or orange haze you can't see the sun through. And hanging over the horizon, there's the planet you built.

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