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Exoplanet Proxima Centauri b
Exoplanet Proxima Centauri b orbits star Proxima Centauri that lies 4 light years away from the Sun.
It weighs about 1.173 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
4 light years
4 light years
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Proxima Centauri b
Exoplanet, rocky planet
Star: Proxima Centauri
Distance from the star: 0.05 AU
Orbit around star: 11.18427 days
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Orbital period
Orbital period of exoplanet Proxima Centauri b around its star is 11.18427 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: 1.173 M Earth
Exoplanet mass
Exoplanet Proxima Centauri b has 1.173 Earth masses.
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: 1.1 R Earth | 0.1 R Jupiter
Density: 4859 kg/m3 | 88.14 % Earth
Temperature: 234 K | -39.15 °C
Year of discovery: 2016 (radial velocity)
Other designations of this exoplanet
Alpha Centauri C b, CCDM J14396-6050C b, GCTP 3278.00 b, Gliese 551 b, HIP 70890 b, LFT 1110 b, LHS 49 b, LPM 526 b, LTT 5721 b, NLTT 37460 b, V645 Centauri b
Alpha Centauri C b, CCDM J14396-6050C b, GCTP 3278.00 b, Gliese 551 b, HIP 70890 b, LFT 1110 b, LHS 49 b, LPM 526 b, LTT 5721 b, NLTT 37460 b, V645 Centauri b
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Proxima Centauri system structure
Exoplanet Proxima Centauri b orbits star Proxima Centauri, which has much lower mass than Sun. It is one of 3 known exoplanets orbiting this star.
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Alpha Centauri | ||||||||
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Alpha Centauri B | 17.493 AU | |||||||
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Proxima Centauri | 8700 AU | |||||||
| Proxima Centauri d | 0.03 AU | 0.3 M⊕ | 0.8 R⊕ | 5.2 days | |||||
| Proxima Centauri b | 0.05 AU | 1.2 M⊕ | 1.1 R⊕ | 11.2 days | |||||
| Proxima Centauri c unconfirmed |
1.48 AU | 7.8 M⊕ | 1928 days | ||||||
Comparison
When comparing to the Solar system planets, Proxima Centauri b has 1.17 times the mass of Earth and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
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Mass | 21.33 | 1.44 | 1.17 | 10.66 | 0 | 0.01 | 0.08 | 0.07 |
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Size | 2.87 | 1.16 | 1.1 | 2.08 | 0.1 | 0.12 | 0.28 | 0.29 |
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Density | 0.9 | 0.93 | 0.88 | 1.19 | 3.91 | 6.98 | 3.86 | 2.81 |
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Distance | 0.13 | 0.07 | 0.05 | 0.03 | 0.01 | 0.01 | 0 | 0 |
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Temperature | 0.53 | 0.32 | 0.81 | 1.13 | 1.44 | 1.76 | 3 | 3.25 |
Habitability
Habitable zone of the star: 0.1 - 0.15 AU
The planet's orbit is close to hotter edge of the habitable zone of its star.
The planet has mass comparable to Earth.
News from this star system
10. 02 2022
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