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Exoplanet HD 212729 b
Exoplanet HD 212729 b orbits star HD 212729 that lies 421 light years away from the Sun.
It weighs about 16.9 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
421 light years
421 light years
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HD 212729 b
Exoplanet, super-earth
Star: HD 212729
Distance from the star: 0.09103 AU
Orbit around star: 9.13966 days
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Orbital period
Orbital period of exoplanet HD 212729 b around its star is 9.13966 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: 16.9 M Earth
Exoplanet mass
Exoplanet HD 212729 b has 16.9 Earth masses, or 0.98 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: 2.87 R Earth | 0.3 R Jupiter
Density: 3942 kg/m3 | 71.50 % Earth
Temperature: 1135 K | 861.85 °C
Year of discovery: 2023 (transit)
Other designations of this exoplanet
TOI-1052 b, 2MASS 22300272-7538476 b
TOI-1052 b, 2MASS 22300272-7538476 b
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HD 212729 system structure
Exoplanet HD 212729 b orbits star HD 212729, which has bigger mass than Sun. It is one of 2 known exoplanets orbiting this star.
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HD 212729 | ||||||||
| HD 212729 b | 0.09 AU | 16.9 M⊕ | 2.9 R⊕ | 9.1 days | |||||
| HD 212729 c | 0.23 AU | 34.3 M⊕ | 36 days | ||||||
Comparison
When comparing to the Solar system planets, HD 212729 b has 98 % of mass of Neptune and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
|
Mass | 307.27 | 20.74 | 16.9 | 153.64 | 0.05 | 0.18 | 1.16 | 0.98 |
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Size | 7.5 | 3.02 | 2.87 | 5.42 | 0.26 | 0.32 | 0.72 | 0.76 |
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Density | 0.73 | 0.75 | 0.72 | 0.97 | 3.17 | 5.66 | 3.13 | 2.28 |
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Distance | 0.23 | 0.13 | 0.09 | 0.06 | 0.02 | 0.01 | 0 | 0 |
|
Temperature | 2.58 | 1.54 | 3.94 | 5.46 | 6.96 | 8.53 | 14.55 | 15.76 |
Habitability
Habitable zone of the star: 1.4 - 2 AU
The planet is too hot to sustain liquid water.