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Exoplanet HD 191939 c
Exoplanet HD 191939 c orbits star HD 191939 that lies 174 light years away from the Sun.
It weighs about 8 Earth masses and orbits its star closer than Earth orbits Sun.
Sun distance
174 light years
174 light years
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HD 191939 c
Exoplanet, sub-neptune
Star: HD 191939
Distance from the star: 0.170 AU
Orbit around star: 28.57974 days
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Orbital period
Orbital period of exoplanet HD 191939 c around its star is 28.57974 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: 8 M Earth
Exoplanet mass
Exoplanet HD 191939 c has 8 Earth masses, or 0.55 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: 3.195 R Earth | 0.3 R Jupiter
Density: 1352 kg/m3 | 24.52 % Earth
Temperature: 605 K | 331.85 °C
Year of discovery: 2020 (transit)
Other designations of this exoplanet
TOI 1339 c, HIP 99175 c, TIC 269701147 c
TOI 1339 c, HIP 99175 c, TIC 269701147 c
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HD 191939 system structure
Exoplanet HD 191939 c orbits star HD 191939, which has lower mass than Sun. It is one of 6 known exoplanets orbiting this star.
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HD 191939 | ||||||||
| HD 191939 b | 0.08 AU | 10 M⊕ | 3.4 R⊕ | 8.9 days | |||||
| HD 191939 c | 0.17 AU | 8 M⊕ | 3.2 R⊕ | 28.6 days | |||||
| HD 191939 d | 0.21 AU | 2.8 M⊕ | 3 R⊕ | 38.4 days | |||||
| HD 191939 e | 0.4 AU | 112.2 M⊕ | 101.5 days | ||||||
| HD 191939 g | 0.81 AU | 15.5 M⊕ | 284 days | ||||||
| HD 191939 f unconfirmed |
4.8 AU | 660 M⊕ | 4450 days | ||||||
Comparison
When comparing to the Solar system planets, HD 191939 c has 55 % of mass of Uranus and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
|
Mass | 145.45 | 9.82 | 8 | 72.73 | 0.03 | 0.08 | 0.55 | 0.47 |
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Size | 8.34 | 3.36 | 3.2 | 6.03 | 0.29 | 0.35 | 0.8 | 0.84 |
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Density | 0.25 | 0.26 | 0.25 | 0.33 | 1.09 | 1.94 | 1.07 | 0.78 |
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Distance | 0.44 | 0.24 | 0.17 | 0.11 | 0.03 | 0.02 | 0.01 | 0.01 |
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Temperature | 1.38 | 0.82 | 2.1 | 2.91 | 3.71 | 4.55 | 7.76 | 8.4 |
Habitability
Habitable zone of the star: 0.87 - 1.2 AU
The planet is too hot to sustain liquid water.
The planet is bigger than Earth and smaller than Neptune. Its average density 1352 kg/m3 points to a hot gas planet.