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Exoplanet BD-21 397 b
Exoplanet BD-21 397 b orbits star BD-21 397 that lies 77 light years away from the Sun.
It weighs about 222.535 Earth masses and orbits its star further than Earth orbits Sun.
Sun distance
77 light years
77 light years
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BD-21 397 b
Exoplanet
Star: BD-21 397
Distance from the star: 2.63 AU
Orbit around star: 1891 days
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Orbital period
Orbital period of exoplanet BD-21 397 b around its star is 1891 days (or 5.2 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
Eccentricity: 0.1Basic characteristic
Mass: 222.535 M Earth
| 0.7002 M Jupiter
Exoplanet mass
Exoplanet BD-21 397 b has 222.535 Earth masses (or 0.7002 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
Other designations of this exoplanet
Gliese 1044 b, GJ 1044 b, HIP 10337 b, LTT 1141 b, TIC 268804174 b, WISEA J021312.45-211146.6 b, TYC 5861-2058-1 b, 2MASS J02131212-2111474 b, BD-210397 b
Gliese 1044 b, GJ 1044 b, HIP 10337 b, LTT 1141 b, TIC 268804174 b, WISEA J021312.45-211146.6 b, TYC 5861-2058-1 b, 2MASS J02131212-2111474 b, BD-210397 b
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BD-21 397 system structure
Exoplanet BD-21 397 b orbits star BD-21 397, which has lower mass than Sun. It is one of 2 known exoplanets orbiting this star.
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BD-21 397 | ||||||||
| BD-21 397 b | 2.63 AU | 222.5 M⊕ | 1891 days | ||||||
| BD-21 397 c | 5.9 AU | 763 M⊕ | 6360 days | ||||||
Comparison
When comparing to the Solar system planets, BD-21 397 b has 70 % of mass of Jupiter and it orbits its star a little closer than Jupiter.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
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Mass | 4046.09 | 273.05 | 222.54 | 2023.05 | 0.7 | 2.34 | 15.24 | 12.94 |
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Distance | 6.74 | 3.64 | 2.63 | 1.73 | 0.51 | 0.28 | 0.14 | 0.09 |
Habitability
Habitable zone of the star: 0.31 - 0.45 AU
The planet is too cold to sustain liquid water on its surface. It is however possible that there is environment with higher temperatures on some of its potential moons.
The planet is probably a gas giant and has no surface, however life could still be possible on the potential moons orbiting it.