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Exoplanet HD 219666 b
Exoplanet HD 219666 b orbits star HD 219666 that lies 307 light years away from the Sun.
It weighs about 16.595 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
307 light years
307 light years
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HD 219666 b
Exoplanet
Star: HD 219666
Distance from the star: 0.06356 AU
Orbit around star: 6.03607 days
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Orbital period
Orbital period of exoplanet HD 219666 b around its star is 6.03607 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: 16.595 M Earth
Exoplanet mass
Exoplanet HD 219666 b has 16.595 Earth masses, or 0.96 times the mass of Neptune.
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: 4.71 R Earth | 0.4 R Jupiter
Density: 876 kg/m3 | 15.89 % Earth
Temperature: 1073 K | 799.85 °C
Year of discovery: 2018 (transit)
Other designations of this exoplanet
TIC 266980320 b, TOI-118 b, 2MASS J23181364-5654139 b, TYC 8834-859-1 b, WISEA J231814.03-565414.2 b
TIC 266980320 b, TOI-118 b, 2MASS J23181364-5654139 b, TYC 8834-859-1 b, WISEA J231814.03-565414.2 b
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HD 219666 system structure
Exoplanet HD 219666 b orbits star HD 219666, which has lower mass than Sun. It is the only known exoplanet orbiting this star
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HD 219666 | ||||||||
| HD 219666 b | 0.06 AU | 16.6 M⊕ | 4.7 R⊕ | 6 days | |||||
Comparison
When comparing to the Solar system planets, HD 219666 b has 96 % of mass of Neptune and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
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Mass | 301.73 | 20.36 | 16.6 | 150.86 | 0.05 | 0.17 | 1.14 | 0.96 |
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Size | 12.3 | 4.96 | 4.71 | 8.89 | 0.42 | 0.52 | 1.18 | 1.24 |
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Density | 0.16 | 0.17 | 0.16 | 0.22 | 0.7 | 1.26 | 0.7 | 0.51 |
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Distance | 0.16 | 0.09 | 0.06 | 0.04 | 0.01 | 0.01 | 0 | 0 |
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Temperature | 2.44 | 1.46 | 3.73 | 5.16 | 6.58 | 8.07 | 13.76 | 14.9 |
Habitability
Habitable zone of the star: 1 - 1.5 AU
The planet is too hot to sustain liquid water.
The planet is bigger than Earth and smaller than Neptune. Its average density 876 kg/m3 points to a hot gas planet.