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Exoplanet Kepler 21 A c
(Unconfirmed Exoplanet)
Kepler 21 A c is an unconfirmed exoplanet detected around star Kepler 21 A. More observations are needed to confirm its existence.
Sun distance
354 light years
354 light years
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Kepler 21 A c
Exoplanet, gas giant
Star: Kepler 21 A
Distance from the star: 17.7 AU
Orbit around star: 25567 days
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Orbital period
Orbital period of exoplanet Kepler 21 A c around its star is 25567 days (or 70 years).
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: 1176.256 M Earth
| 3.7012 M Jupiter
Exoplanet mass
Exoplanet Kepler 21 A c has 1176.256 Earth masses (or 3.7012 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
Year of discovery: 2024 (radial velocity)
Other designations of this exoplanet
HIP 94112 c, Kepler-21 c, KOI-975 c, KIC 3632418 c, TYC 3120-963-1 c, 2MASS J19092683+3842505 c, HD 179070 c
HIP 94112 c, Kepler-21 c, KOI-975 c, KIC 3632418 c, TYC 3120-963-1 c, 2MASS J19092683+3842505 c, HD 179070 c
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Kepler 21 system structure
Exoplanet Kepler 21 A c orbits star Kepler 21 A, which has bigger mass than Sun. It is one of 2 known exoplanets orbiting this star.
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Kepler 21 A | ||||||||
| Kepler 21 A b | 0.04 AU | 6.7 M⊕ | 1.6 R⊕ | 2.8 days | |||||
| Kepler 21 A c unconfirmed |
17.7 AU | 1176.3 M⊕ | 25567 days | ||||||
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Kepler 21 B | 87 AU | |||||||
Comparison
When comparing to the Solar system planets, Kepler 21 A c has 3.7 times the mass of Jupiter and it orbits its star a little closer than Uranus.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
|
Mass | 21386.47 | 1443.26 | 1176.26 | 10693.24 | 3.7 | 12.36 | 80.57 | 68.39 |
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Distance | 45.38 | 24.48 | 17.7 | 11.61 | 3.4 | 1.86 | 0.92 | 0.59 |
Habitability
Habitable zone of the star: 2 - 2.9 AU
The planet is probably a gas giant and has no surface, however life could still be possible on the potential moons orbiting it.