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Exoplanet HD 39855 A b
Exoplanet HD 39855 A b orbits star HD 39855 A that lies 76 light years away from the Sun.
It weighs about 8.488 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
76 light years
76 light years
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HD 39855 A b
Exoplanet
Star: HD 39855 A
Distance from the star: 0.041 AU
Orbit around star: 3.2498 days
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Orbital period
Orbital period of exoplanet HD 39855 A b around its star is 3.2498 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: 8.488 M Earth
Exoplanet mass
Exoplanet HD 39855 A b has 8.488 Earth masses, or 0.58 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: 2019 (radial velocity)
Other designations of this exoplanet
** GAN 2A b, ADS 4503 A b, BD-19 1297 b, GSC 05939-02257 b, HIC 27922 b, HIP 27922 b, 2MASS J05543015-1942156 b, TIC 160301040 b, TYC 5939-2257-1 b, WDS J05545-1942A b
** GAN 2A b, ADS 4503 A b, BD-19 1297 b, GSC 05939-02257 b, HIC 27922 b, HIP 27922 b, 2MASS J05543015-1942156 b, TIC 160301040 b, TYC 5939-2257-1 b, WDS J05545-1942A b
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HD 39855 system structure
Exoplanet HD 39855 A b orbits star HD 39855 A, which has lower mass than Sun. It is the only known exoplanet orbiting this star
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HD 39855 A | ||||||||
| HD 39855 A b | 0.04 AU | 8.5 M⊕ | 3.2 days | ||||||
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HD 39855 B | ||||||||
Comparison
When comparing to the Solar system planets, HD 39855 A b has 58 % 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 | 154.33 | 10.41 | 8.49 | 77.16 | 0.03 | 0.09 | 0.58 | 0.49 |
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Distance | 0.11 | 0.06 | 0.04 | 0.03 | 0.01 | 0 | 0 | 0 |
Habitability
Habitable zone of the star: 0.67 - 0.97 AU
The planet is too hot to sustain liquid water.