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Exoplanet TOI-2257 b
Exoplanet TOI-2257 b orbits star TOI-2257 that lies 189 light years away from the Sun.
It weighs about 5.691 Earth masses and orbits its star closer than Earth orbits Sun.
Sun distance
189 light years
189 light years
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TOI-2257 b
Exoplanet, sub-neptune
Star: TOI-2257
Distance from the star: 0.145 AU
Orbit around star: 35.18934 days
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Orbital period
Orbital period of exoplanet TOI-2257 b around its star is 35.18934 days.
The orbital period of an exoplanet is the time it takes to complete one full orbit around its star, usually measured in days. Most of the exoplanets discovered so far have orbital periods of less than one year...
More about Orbital period in StellarGuide
Basic characteristic
Mass: 5.691 M Earth
Exoplanet mass
Exoplanet TOI-2257 b has 5.691 Earth masses, or 0.39 times the mass of Uranus.
The mass of an exoplanet is one of the most important characteristics for understanding what kind of world it is — whether it’s small and rocky like Earth or large and gaseous like Jupiter. Mass provides key information about the planet’s composition, gravity, and formation history...
More about Exoplanet mass in StellarGuide
Size: 2.194 R Earth | 0.2 R Jupiter
Density: 2971 kg/m3 | 53.89 % Earth
Temperature: 256 K | -17.15 °C
Year of discovery: 2021 (transit)
Other designations of this exoplanet
TIC 198485881 b
TIC 198485881 b
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TOI-2257 system structure
Exoplanet TOI-2257 b orbits star TOI-2257, which has lower mass than Sun. It is the only known exoplanet orbiting this star
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TOI-2257 | ||||||||
| TOI-2257 b | 0.15 AU (HZ) | 5.7 M⊕ | 2.2 R⊕ | 35.2 days | |||||
Comparison
When comparing to the Solar system planets, TOI-2257 b has 39 % of mass of Uranus and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
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Mass | 103.47 | 6.98 | 5.69 | 51.74 | 0.02 | 0.06 | 0.39 | 0.33 |
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Size | 5.73 | 2.31 | 2.19 | 4.14 | 0.2 | 0.24 | 0.55 | 0.58 |
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Density | 0.55 | 0.57 | 0.54 | 0.73 | 2.39 | 4.27 | 2.36 | 1.72 |
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Distance | 0.37 | 0.2 | 0.15 | 0.1 | 0.03 | 0.02 | 0.01 | 0 |
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Temperature | 0.58 | 0.35 | 0.89 | 1.23 | 1.57 | 1.92 | 3.28 | 3.56 |
Habitability
Habitable zone of the star: 0.11 - 0.16 AU
The planet is orbiting inside the habitable zone of its star.
The planet is bigger than Earth and smaller than Neptune. Its average density 2971 kg/m3 points to a gas planet. There could be habitable moons in orbit.