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Exoplanet Gliese 221 b
Exoplanet Gliese 221 b orbits star Gliese 221 that lies 66 light years away from the Sun.
It weighs about 8.583 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
66 light years
66 light years
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Gliese 221 b
Exoplanet
Star: Gliese 221
Distance from the star: 0.0428 AU
Orbit around star: 3.8728 days
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Orbital period
Orbital period of exoplanet Gliese 221 b around its star is 3.8728 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: 8.583 M Earth
Exoplanet mass
Exoplanet Gliese 221 b has 8.583 Earth masses, or 0.59 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
Year of discovery: 2013 (radial velocity)
Other designations of this exoplanet
BD-06 1339 b, HIC 27803 b, HIP 27803 b, LTT 2396 b, 2MASS J05530028-0559410 b, NLTT 15758 b, MCC 10 b, GJ 221 b, TIC 66914642 b, TYC 4781-406-1 b
BD-06 1339 b, HIC 27803 b, HIP 27803 b, LTT 2396 b, 2MASS J05530028-0559410 b, NLTT 15758 b, MCC 10 b, GJ 221 b, TIC 66914642 b, TYC 4781-406-1 b
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Gliese 221 system structure
Exoplanet Gliese 221 b orbits star Gliese 221, which has lower mass than Sun. It is one of 4 known exoplanets orbiting this star.
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Gliese 221 | ||||||||
| Gliese 221 e | 0.03 AU | 3.3 M⊕ | 2.4 days | ||||||
| Gliese 221 b | 0.04 AU | 8.6 M⊕ | 3.9 days | ||||||
| Gliese 221 c | 0.44 AU | 54 M⊕ | 125.9 days | ||||||
| Gliese 221 d | 1.06 AU | 18.5 M⊕ | 487 days | ||||||
Comparison
When comparing to the Solar system planets, Gliese 221 b has 59 % 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 | 156.05 | 10.53 | 8.58 | 78.03 | 0.03 | 0.09 | 0.59 | 0.5 |
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Distance | 0.11 | 0.06 | 0.04 | 0.03 | 0.01 | 0 | 0 | 0 |
Habitability
Habitable zone of the star: 0.49 - 0.71 AU
The planet is too hot to sustain liquid water.