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Entering orbit…
Habitability
63/ 100
Habitable
TOI-561 f rendered in TerraForge from its measured mass, orbit and star

TOI-561 f

Also written TOI-561f, TOI 561f, TOI 561 f

Ice WorldHabitable280 light years awayFound 2020
exoplanet.euListed by the Extrasolar Planets Encyclopaedia; not yet in NASA's confirmed catalogue.View on exoplanet.eu

TOI-561 f, from the Extrasolar Planets Encyclopaedia (found 2020). Measured: 19.1 Earth masses, 1.03 AU, a 5326 K G-type star. Composition inferred from a measured bulk density of 1.53x Earth's at this size, suggesting roughly 6% water/ice by mass, with an assumed 24-hour day — rotation cannot be measured for exoplanets.

Host star

TOI-561

Type
G-type (Yellow (Sun-like))
Temperature
5,326 K
Radius
0.832 ☉
Mass
0.805 ☉
Known planets
5, including this one
Luminosity
0.502 ☉

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

Ice World

Life unlikely — too cold for liquid waterMagnetic FieldLow Activity
Why is this a Ice World?
TOI-561 f orbits at 1.03 AU from its star, resulting in frigid temperatures of 237K.
Ice worlds form beyond the frost line where temperatures are low enough for water and other volatiles to freeze solid. They may have subsurface oceans beneath thick ice shells.
Classification Criteria:
✓ Distance: 1.03 AU (>3 AU) or Temperature <200K✓ Temperature: 237K✓ Water content: 36.2% for ice formation

Reading TOI-561 f’s atmosphere

Dominant elements: O, Si, Fe, N, H, CThis is what a telescope would measure while TOI-561 f 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.TOI-561 f sits about 280 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.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.
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Habitability ScoreHabitable
63
Contributing Factors
temperature40
Extreme temperature - very difficult for life
atmosphere70
Nitrogen atmosphere provides protection but not breathable
water62
Good water content - mostly frozen
magnetic Field100
Magnetic field provides radiation protection
geology60
Some geological activity provides slow nutrient cycling
Organic Chemistry80
Core organic elements (CHNO) present
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution

Physical Properties

Mass
19.10x Earth (1.14e+26 kg)
Radius
2.67x Earth (17,030 km)
This planet: 2.67× Earth radiusEarth: 1× (baseline)
Surface Gravity
2.67x Earth (26.2 m/s²)
Surface Temperature
237 K (-37 °C / -34 °F)
Rotation Period
24.0 hours/day
This planet: 24 h/dayEarth: 24 h/day

Orbital Environment

Star Type
G-type (Yellow (Sun-like))
Distance from Star
1.03 AU (154 million km)
Orbital Period
1.05 years

Atmosphere

Thin nitrogen and methane atmosphere

Elemental Composition

O - Oxygen
31.1%
Si - Silicon
23.5%
Fe - Iron
11.8%

Surface Characteristics

Frozen surface covered in water ice, possible subsurface ocean if tidal heating present
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The surface of TOI-700 d as TerraForge draws it: red-leaved trees over green ground under a lavender sky

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