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Exoplanet HD 188474 b
(Unconfirmed Exoplanet)
HD 188474 b is an unconfirmed exoplanet detected around star HD 188474. More observations are needed to confirm its existence.
Sun distance
64 light years
64 light years
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HD 188474 b
Exoplanet, super-earth
Star: HD 188474
Distance from the star: 0.10 AU
Orbit around star: 15.33759 days
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Orbital period
Orbital period of exoplanet HD 188474 b around its star is 15.33759 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: 4.6230 M Earth
Exoplanet mass
Exoplanet HD 188474 b has 4.6230 Earth masses, or 0.32 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
Size: 1.99 R Earth | 0.2 R Jupiter
Density: 3234 kg/m3 | 58.66 % Earth
Temperature: 591 K | 317.85 °C
Year of discovery: 2019 (transit)
Other designations of this exoplanet
TIC 271478281 b, LTT 7876 b, GJ 1246 b, Gliese 1246 b, HIP 98130 b, 2MASS J19563704-3120071 b, TYC 7439-410-1 b, TOI 2194 b
TIC 271478281 b, LTT 7876 b, GJ 1246 b, Gliese 1246 b, HIP 98130 b, 2MASS J19563704-3120071 b, TYC 7439-410-1 b, TOI 2194 b
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HD 188474 system structure
Exoplanet HD 188474 b orbits star HD 188474, which has lower mass than Sun. It is the only known exoplanet orbiting this star
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HD 188474 | ||||||||
| HD 188474 b unconfirmed |
0.1 AU | 4.6 M⊕ | 2 R⊕ | 15.3 days | |||||
Comparison
When comparing to the Solar system planets, HD 188474 b has 32 % 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 | 84.05 | 5.67 | 4.62 | 42.03 | 0.01 | 0.05 | 0.32 | 0.27 |
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Size | 5.2 | 2.09 | 1.99 | 3.75 | 0.18 | 0.22 | 0.5 | 0.52 |
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Density | 0.6 | 0.62 | 0.59 | 0.79 | 2.6 | 4.64 | 2.57 | 1.87 |
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Distance | 0.26 | 0.14 | 0.1 | 0.07 | 0.02 | 0.01 | 0.01 | 0 |
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Temperature | 1.34 | 0.8 | 2.05 | 2.84 | 3.63 | 4.44 | 7.58 | 8.21 |
Habitability
Habitable zone of the star: 0.49 - 0.7 AU
The planet is too hot to sustain liquid water.