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Exoplanet Gliese 581 b
Exoplanet Gliese 581 b orbits star Gliese 581 that lies 21 light years away from the Sun.
It weighs about 15.31 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
21 light years
21 light years
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Gliese 581 b
Exoplanet
Star: Gliese 581
Distance from the star: 0.0399 AU
Orbit around star: 5.3683 days
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Orbital period
Orbital period of exoplanet Gliese 581 b around its star is 5.3683 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
Eccentricity: 0.0284Basic characteristic
Mass: 15.31 M Earth
Exoplanet mass
Exoplanet Gliese 581 b has 15.31 Earth masses, or 1.05 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
Other designations of this exoplanet
Wolf 562 b, HO Librae b, HO Lib b, BD−07°4003 b, GJ 581 b, HIP 74995 b, LFT 1195 b, LHS 394 b, LPM 564 b, LTT 6112 b, NLTT 39886 b, TYC 5594-1093-1 b, BD-07 4003 b, Gl 581 b
Wolf 562 b, HO Librae b, HO Lib b, BD−07°4003 b, GJ 581 b, HIP 74995 b, LFT 1195 b, LHS 394 b, LPM 564 b, LTT 6112 b, NLTT 39886 b, TYC 5594-1093-1 b, BD-07 4003 b, Gl 581 b
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Gliese 581 system structure
Exoplanet Gliese 581 b orbits star Gliese 581, which has lower mass than Sun. It is one of 3 known exoplanets orbiting this star.
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Gliese 581 | ||||||||
| Gliese 581 e | 0.03 AU | 1.8 M⊕ | 3.1 days | ||||||
| Gliese 581 b | 0.04 AU | 15.3 M⊕ | 5.4 days | ||||||
| Gliese 581 c | 0.07 AU | 5 M⊕ | 12.9 days | ||||||
| Gliese 581 g disproven |
0.13 AU (HZ) | 2.2 M⊕ | - | ||||||
| Gliese 581 d disproven |
0.22 AU | 7 M⊕ | - | ||||||
| Gliese 581 f disproven |
50 AU | - | |||||||
Comparison
When comparing to the Solar system planets, Gliese 581 b has 1.05 times the mass of Uranus and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
|
Mass | 278.36 | 18.79 | 15.31 | 139.18 | 0.05 | 0.16 | 1.05 | 0.89 |
|
Distance | 0.1 | 0.06 | 0.04 | 0.03 | 0.01 | 0 | 0 | 0 |
Habitability
Habitable zone of the star: 0.1 - 0.15 AU
The planet is too hot to sustain liquid water.