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Exoplanet L 115-21 b
(Unconfirmed Exoplanet)
L 115-21 b is an unconfirmed exoplanet detected around star L 115-21. More observations are needed to confirm its existence.
Sun distance
42 light years
42 light years
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L 115-21 b
Exoplanet
Star: L 115-21
Distance from the star: 0.03 AU
Orbit around star: 4.2 days
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Orbital period
Orbital period of exoplanet L 115-21 b around its star is 4.2 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: 0.4 M Earth
Exoplanet mass
Exoplanet L 115-21 b has 0.4 Earth masses, or 0.49 times the mass of Venus.
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: 0.7 R Earth | 0.1 R Jupiter
Density: 6430 kg/m3 | 116.63 % Earth
Temperature: 548 K | 274.85 °C
Year of discovery: 2026 (radial velocity)
Other designations of this exoplanet
L 115-21 b, LHS 3513 b, GJ 774 A b, HIP 98811 b, Gaia DR3 6427708902553822592 b
L 115-21 b, LHS 3513 b, GJ 774 A b, HIP 98811 b, Gaia DR3 6427708902553822592 b
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L 115-21 system structure
Exoplanet L 115-21 b orbits star L 115-21, which has lower mass than Sun. It is the only known exoplanet orbiting this star
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L 115-21 | ||||||||
| L 115-21 b unconfirmed |
0.03 AU | 0.4 M⊕ | 0.7 R⊕ | 4.2 days | |||||
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L 115-22 | ||||||||
Comparison
When comparing to the Solar system planets, L 115-21 b has 49 % of mass of Venus and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
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Mass | 7.27 | 0.49 | 0.4 | 3.64 | 0 | 0 | 0.03 | 0.02 |
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Size | 1.83 | 0.74 | 0.7 | 1.32 | 0.06 | 0.08 | 0.18 | 0.18 |
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Density | 1.19 | 1.23 | 1.17 | 1.58 | 5.17 | 9.23 | 5.11 | 3.72 |
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Distance | 0.08 | 0.04 | 0.03 | 0.02 | 0.01 | 0 | 0 | 0 |
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Temperature | 1.25 | 0.74 | 1.9 | 2.63 | 3.36 | 4.12 | 7.03 | 7.61 |
Habitability
Habitable zone of the star: 0.15 - 0.21 AU
The planet is too hot to sustain liquid water.
The planet has mass comparable to Earth.