K2-18b
| Exoplanet | List of exoplanets
| |||||
|---|---|---|---|---|---|---|
| Parent star | ||||||
| Star | K2-18 | |||||
| Right ascension | (α) | 11h30m14.51s [1] | ||||
| Declination | (δ) | +07d35m18.2s[1] | ||||
| Distance | 111±13 ly (34±4[1] pc) | |||||
| Mass | (m) | 0.413±0.043[1] M☉ | ||||
| Radius | (r) | 0.394±0.038[1] R☉ | ||||
| Temperature | (T) | 3503±60[1] K | ||||
| Metallicity | [Fe/H] | 0.090±0.090[1] | ||||
| Age | null[1] Gyr | |||||
| Physical characteristics | ||||||
| Mass | (m) | null[1] M⊕ | ||||
| Radius | (r) | 2.24±0.23[1] R⊕ | ||||
| Temperature | (T) | 272 K (−1 °C; 30 °F) | ||||
| Orbital elements | ||||||
| Semi-major axis | (a) | 0.1491[1] AU | ||||
| Eccentricity | (e) | null[1] | ||||
| Orbital period | (P) | 32.94488[1] d | ||||
| Inclination | (i) | null[1]° | ||||
| Discovery information | ||||||
| Discovery date | 2015 | |||||
| Discoverer(s) | ||||||
| Discovery method | Transit | |||||
| Discovery site | Kepler Space Observatory | |||||
| Discovery status | Confirmed | |||||
K2-18b also known as EPIC 201912552 b is an exoplanet orbiting the red dwarf star K2-18 every 33 days 111 ly away in the constellation Leo.[1]
Physical Characteristics
Due to its high radius, slightly smaller than Kepler-22b it could be a "Water world", comparable to Gliese 1214 b which is known to be a water rich planet, or It could have a gaseous outer shell similar to Kepler-11f one of the smallest gas planets known.
References
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