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Entering orbit…
Habitability
0/ 100
Uninhabitable
GP Com b rendered in TerraForge from its measured mass, orbit and star

GP Com b

Also written GP Comb

Brown Dwarf237 light years awayFound 2016
Mass
8330.00 × Earth
Radius
11.90 × Earth
Gravity
58.82 g
Surface (est.)
1,700 K
Year
0.8 hrs
From Earth
237 ly
Mass
8330.00 × Earth
Radius
11.90 × Earth
Gravity
58.82 g
Surface (est.)
1,700 K
Year
0.8 hrs
From Earth
237 ly

GP Com system

Type
White dwarf
Spectral type
DBe
Temperature
14,800 K
Radius
0.011 ☉
Mass
0.5 ☉
Planets
1
Luminosity
5.23e-3 ☉

Published by the Extrasolar Planets Encyclopaedia. This world’s temperature and habitability score are computed from its star’s published radius and temperature.

GP Com b0.010 AUYou are here8,330 M⊕
Habitable zone

Star and planets drawn to scale: GP Com b is 9.9 times as wide as its star. Orbits spaced as in the star system view.

exoplanet.euListed by the Extrasolar Planets Encyclopaedia; not yet in NASA's confirmed catalogue.View on exoplanet.eu

Estimated: this planet doesn't transit its star, so its size is inferred, not measured

GP Com b, from the Extrasolar Planets Encyclopaedia (found 2016). Measured: 8330 Earth masses, 0.00157 AU, a 14800 K B-type star. Composition inferred from a mass of 8330 Earths, which is giant territory whatever its 4.94x density suggests, with a day locked to its 0.0-day year, as anything orbiting this close would be, slowed to 3.82 hours: an assumed spin is not allowed to push a real world past breakup.

Surface. No surface: a deuterium-burning sphere the size of Jupiter and dozens of times its mass, glowing dull red from its own heat

Brown Dwarf
Magnetic FieldNone Activity
GP Com 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: 8330.0x EarthTemperature: 1700K

Reading GP Com b’s atmosphere

Dominant elements: H, He, O, C, NThis is what a telescope would measure while GP Com 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.GP Com b sits about 237 light-years away, found by the radial velocity 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
temperature0
Inferno world - temperatures exceed all possibility of life
atmosphere9

Hydrogen and helium with iron and silicate cloud decks - hot enough to rain molten metal

Hydrogen-rich atmosphere typical of gas giants (severely compromised by extreme rotation)
water5
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans (water stripped by extreme rotation)
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
rotation5
Extreme rotation (< 4 hrs) - winds exceeding 1000 mph, constant category 5 hurricanes, uninhabitable surface

Physical Properties

Mass
8330.00x Earth (4.97e+28 kg)
Radius
20.27x Earth (129,148 km)
This planet: 20.27× Earth radiusEarth: 1× (baseline)
Surface Gravity
20.27x Earth (198.9 m/s²)
Surface Temperature
1,700 K (1,427 °C / 2,600 °F)
Rotation Period
3.8 hours/day (faster than Earth)
This planet: 4 h/dayEarth: 24 h/day

Time Dilation

Clocks run 7.8 minutes per year slower than deep space — about 10.4 hours 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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