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Exoplanet HD 209458 b
Exoplanet HD 209458 b orbits star HD 209458 that lies 159 light years away from the Sun.
It weighs about 232.072 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
159 light years
159 light years
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HD 209458 b
Exoplanet, gas giant
Star: HD 209458
Distance from the star: 0.04747 AU
Orbit around star: 3.524745 days
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Orbital period
Orbital period of exoplanet HD 209458 b around its star is 3.524745 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: 0.014Basic characteristic
Mass: 232.072 M Earth
| 0.7302 M Jupiter
Exoplanet mass
Exoplanet HD 209458 b has 232.072 Earth masses (or 0.7302 Jupiter 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: 15.58 R Earth | 1.4 R Jupiter
Density: 338 kg/m3 | 6.13 % Earth
Temperature: 1451 K | 1177.85 °C
Year of discovery: 1999 (transit)
Other designations of this exoplanet
BD +18°4917 b, SAO 107623 b, V376 Peg b, HIC 108859 b, HIP 108859 b, 2MASS J22031077+1853036 b, TIC 420814525 b, TYC 1688-1821-1 b
BD +18°4917 b, SAO 107623 b, V376 Peg b, HIC 108859 b, HIP 108859 b, 2MASS J22031077+1853036 b, TIC 420814525 b, TYC 1688-1821-1 b
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HD 209458 system structure
Exoplanet HD 209458 b orbits star HD 209458, which has bigger mass than Sun. It is the only known exoplanet orbiting this star
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HD 209458 | ||||||||
| HD 209458 b | 0.05 AU | 232.1 M⊕ | 15.6 R⊕ | 3.5 days | |||||
Comparison
When comparing to the Solar system planets, HD 209458 b has 73 % of mass of Jupiter and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
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Mass | 4219.49 | 284.75 | 232.07 | 2109.75 | 0.73 | 2.44 | 15.9 | 13.49 |
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Size | 40.69 | 16.4 | 15.58 | 29.4 | 1.39 | 1.71 | 3.9 | 4.1 |
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Density | 0.06 | 0.06 | 0.06 | 0.08 | 0.27 | 0.49 | 0.27 | 0.2 |
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Distance | 0.12 | 0.07 | 0.05 | 0.03 | 0.01 | 0 | 0 | 0 |
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Temperature | 3.3 | 1.97 | 5.04 | 6.98 | 8.9 | 10.91 | 18.6 | 20.15 |
Habitability
Habitable zone of the star: 1.5 - 2.1 AU
The planet orbits too close to its star and is exposed to extreme temperatures and radiation prohibiting life as we know it.
News from this star system
04. 05 2021
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