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Exoplanet HD 21749 b
Exoplanet HD 21749 b orbits star HD 21749 that lies 53 light years away from the Sun.
It weighs about 23.20 Earth masses and orbits its star closer than Earth orbits Sun.
Sun distance
53 light years
53 light years
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HD 21749 b
Exoplanet, super-earth
Star: HD 21749
Distance from the star: 0.1932 AU
Orbit around star: 35.6077 days
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Orbital period
Orbital period of exoplanet HD 21749 b around its star is 35.6077 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: 23.20 M Earth
Exoplanet mass
Exoplanet HD 21749 b has 23.20 Earth masses, or 1.35 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: 2.836 R Earth | 0.3 R Jupiter
Density: 5608 kg/m3 | 101.72 % Earth
Year of discovery: 2019 (transit)
Other designations of this exoplanet
CD−63 110 A b, CPD−63 232 A b, Gliese 143 b, GJ 143 b, HIC 16069 b, HIP 16069 b, SAO 248808 b, WDS J03270-6330A b, TIC 279741379 b, TYC 8870-01392-1 A b, 2MASS J03265922-6329569 b, TOI 186 b, NLTT 11017 b, LTT 1642 b, WISEA J032659.80-632959.1 b
CD−63 110 A b, CPD−63 232 A b, Gliese 143 b, GJ 143 b, HIC 16069 b, HIP 16069 b, SAO 248808 b, WDS J03270-6330A b, TIC 279741379 b, TYC 8870-01392-1 A b, 2MASS J03265922-6329569 b, TOI 186 b, NLTT 11017 b, LTT 1642 b, WISEA J032659.80-632959.1 b
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HD 21749 system structure
Exoplanet HD 21749 b orbits star HD 21749, which has lower mass than Sun. It is one of 2 known exoplanets orbiting this star.
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HD 21749 | ||||||||
| HD 21749 c | 0.07 AU | 3.7 M⊕ | 0.9 R⊕ | 7.8 days | |||||
| HD 21749 b | 0.19 AU | 23.2 M⊕ | 2.8 R⊕ | 35.6 days | |||||
Comparison
When comparing to the Solar system planets, HD 21749 b has 1.35 times the mass of Neptune and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
|
Mass | 421.82 | 28.47 | 23.2 | 210.91 | 0.07 | 0.24 | 1.59 | 1.35 |
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Size | 7.41 | 2.99 | 2.84 | 5.35 | 0.25 | 0.31 | 0.71 | 0.75 |
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Density | 1.04 | 1.07 | 1.02 | 1.38 | 4.51 | 8.05 | 4.46 | 3.25 |
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Distance | 0.5 | 0.27 | 0.19 | 0.13 | 0.04 | 0.02 | 0.01 | 0.01 |
Habitability
Habitable zone of the star: 0.47 - 0.67 AU
The planet is too hot to sustain liquid water.