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Exoplanet HAT-P-18 A b
Exoplanet HAT-P-18 A b orbits star HAT-P-18 A that lies 527 light years away from the Sun.
It weighs about 58.177 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
527 light years
527 light years
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HAT-P-18 A b
Exoplanet
Star: HAT-P-18 A
Distance from the star: 0.0559 AU
Orbit around star: 5.508029 days
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Orbital period
Orbital period of exoplanet HAT-P-18 A b around its star is 5.508029 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: 0.106Basic characteristic
Mass: 58.177 M Earth
| 0.1831 M Jupiter
Exoplanet mass
Exoplanet HAT-P-18 A b has 58.177 Earth masses (or 0.1831 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: 10.615 R Earth | 0.9 R Jupiter
Density: 268 kg/m3 | 4.86 % Earth
Temperature: 841.0 K | 567.85 °C
Year of discovery: 2010 (transit)
Other designations of this exoplanet
HAT-P-18 A b
HAT-P-18 A b
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HAT-P-18 system structure
Exoplanet HAT-P-18 A b orbits star HAT-P-18 A, which has lower mass than Sun. It is the only known exoplanet orbiting this star
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HAT-P-18 A | ||||||||
| HAT-P-18 A b | 0.06 AU | 58.2 M⊕ | 10.6 R⊕ | 5.5 days | |||||
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HAT-P-18 B | 427 AU | |||||||
Comparison
When comparing to the Solar system planets, HAT-P-18 A b has 61 % of mass of Saturn and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
|
Mass | 1057.76 | 71.38 | 58.18 | 528.88 | 0.18 | 0.61 | 3.98 | 3.38 |
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Size | 27.72 | 11.17 | 10.62 | 20.03 | 0.95 | 1.17 | 2.65 | 2.79 |
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Density | 0.05 | 0.05 | 0.05 | 0.07 | 0.22 | 0.38 | 0.21 | 0.16 |
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Distance | 0.14 | 0.08 | 0.06 | 0.04 | 0.01 | 0.01 | 0 | 0 |
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Temperature | 1.91 | 1.14 | 2.92 | 4.04 | 5.16 | 6.32 | 10.78 | 11.68 |
Habitability
Habitable zone of the star: 0.55 - 0.79 AU
The planet is too hot to sustain liquid water.