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Entering orbit…
Habitability
20/ 100
Extremely Harsh
LP 890-9 c rendered in TerraForge from its measured mass, orbit and star

LP 890-9 c

Also written LP 890-9c, LP 890 9c, LP 890 9 c

Gas Giant106 light years awayFound 2022
Mass
25.30 × Earth
Radius
1.37 × Earth
Gravity
13.48 g
Surface (est.)
271 K
Year
8.5 days
From Earth
106 ly
Mass
25.30 × Earth
Radius
1.37 × Earth
Gravity
13.48 g
Surface (est.)
271 K
Year
8.5 days
From Earth
106 ly

LP 890-9 system

Type
M-type (Red Dwarf)
Spectral type
M6 V
Temperature
2,850 K
Radius
0.156 ☉
Mass
0.118 ☉
Planets
2
Luminosity
1.44e-3 ☉

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.

LP 890-9 b0.019 AU13 M⊕
LP 890-9 c0.040 AUYou are here25 M⊕
Habitable zone

Star and planets drawn to scale: the star is 12 times as wide as LP 890-9 c, so only its edge is in view. Orbits spaced as in the star system view.

LP 890-9 c, from the NASA Exoplanet Archive (found 2022). Measured: 25.3 Earth masses, 0.0398 AU, a 2850 K M-type star. Composition inferred from a measured bulk density of 9.84x Earth's, far too high for silicates alone — an iron-rich world, with a day locked to its 8.5-day year, as anything orbiting this close would be.

Surface. No solid surface - thick gaseous envelope with possible rocky core deep within

Gas Giant
Magnetic FieldExtreme Activity
LP 890-9 c has 0.0% hydrogen and helium, combined with a mass of 25.3x Earth, which exceeds the gas giant threshold.
Gas giants form when massive cores capture enormous atmospheres of light gases. They typically form beyond the 'frost line' where volatiles can condense.
Classification Criteria:
✓ Hydrogen + Helium: 0.0% (>60% required)✓ Mass: 25.3x Earth (>10x required)

Reading LP 890-9 c’s atmosphere

Dominant elements: Si, Fe, Mg, Ni, S, AlThis is what a telescope would measure while LP 890-9 c 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.LP 890-9 c sits about 106 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.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.
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 ScoreExtremely Harsh
20
Contributing Factors
temperature97
Cold - water freezes much of the year; challenging but potentially habitable
atmosphere18

Hydrogen and helium dominated with trace methane and ammonia

Hydrogen-rich atmosphere typical of gas giants (partially stripped by slow rotation)
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 Chemistry20
Limited organic chemistry potential
rotation30
Very slow rotation - days and nights each last several Earth days, bringing severe temperature swings

Physical Properties

Mass
25.30x Earth (1.51e+26 kg)
Radius
2.94x Earth (18,703 km)
This planet: 2.94× Earth radiusEarth: 1× (baseline)
Surface Gravity
2.94x Earth (28.8 m/s²)
Surface Temperature
271 K (-2 °C / 29 °F)
Rotation Period
203.0 hours/day (slower than Earth)
This planet: 203 h/dayEarth: 24 h/day

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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