K2-18b

K2-18b
Exoplanet List of exoplanets
Size comparison
Neptune K2-18b
Parent star
Star K2-18
Right ascension (α) 11h30m14.51s [1]
Declination (δ) +07d35m18.2s[1]
Distance111±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

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 "K2-18 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-17.


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