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Exoplanet HR 858 A b
Exoplanet HR 858 A b orbits star HR 858 A that lies 104 light years away from the Sun.
It weighs about 3.551 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
104 light years
104 light years
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HR 858 A b
Exoplanet, sub-neptune
Star: HR 858 A
Distance from the star: 0.0489 AU
Orbit around star: 3.585287 days
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Orbital period
Orbital period of exoplanet HR 858 A b around its star is 3.585287 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: 0.3Basic characteristic
Mass: 3.551 M Earth
Exoplanet mass
Exoplanet HR 858 A b has 3.551 Earth masses, or 0.24 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: 1.995 R Earth | 0.2 R Jupiter
Density: 2466 kg/m3 | 44.73 % Earth
Temperature: 1552 K | 1278.85 °C
Year of discovery: 2019 (transit)
Other designations of this exoplanet
HD 17926 b, CD-31 1148 b, GC 3443 b, HIC 13363 b, HIP 13363 b, 2MASS J02515623-3048524 b, TIC 178155732 b, TOI-396 b, TYC 7012-833-1 b
HD 17926 b, CD-31 1148 b, GC 3443 b, HIC 13363 b, HIP 13363 b, 2MASS J02515623-3048524 b, TIC 178155732 b, TOI-396 b, TYC 7012-833-1 b
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HR 858 system structure
Exoplanet HR 858 A b orbits star HR 858 A, which has bigger mass than Sun. It is one of 3 known exoplanets orbiting this star.
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HR 858 A | ||||||||
| HR 858 A b | 0.05 AU | 3.6 M⊕ | 2 R⊕ | 3.6 days | |||||
| HR 858 A c | 0.07 AU | 2.2 M⊕ | 2 R⊕ | 6 days | |||||
| HR 858 A d | 0.1 AU | 7.1 M⊕ | 2 R⊕ | 11.2 days | |||||
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HR 858 B | 265 AU | |||||||
Comparison
When comparing to the Solar system planets, HR 858 A b has 24 % 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 | 64.56 | 4.36 | 3.55 | 32.28 | 0.01 | 0.04 | 0.24 | 0.21 |
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Size | 5.21 | 2.1 | 2 | 3.76 | 0.18 | 0.22 | 0.5 | 0.53 |
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Density | 0.46 | 0.47 | 0.45 | 0.61 | 1.98 | 3.54 | 1.96 | 1.43 |
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Distance | 0.13 | 0.07 | 0.05 | 0.03 | 0.01 | 0.01 | 0 | 0 |
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Temperature | 3.53 | 2.11 | 5.39 | 7.46 | 9.52 | 11.67 | 19.9 | 21.56 |
Habitability
Habitable zone of the star: 1.5 - 2.2 AU
The planet orbits too close to its star and is exposed to extreme temperatures and radiation prohibiting life as we know it.
The planet is bigger than Earth and smaller than Neptune. Its average density 2466 kg/m3 points to a hot gas planet.
News from this star system
08. 12 2021
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