K2-18b

K2-18b

Exoplanet		List of exoplanets Size comparison Neptune K2-18b
Parent star
Star		K2-18
Right ascension	(α)	11h30m14.51s
Declination	(δ)	+07d35m18.2s
Distance		111±13 ly (34±4 pc)
Mass	(m)	0.413±0.043 M☉
Radius	(r)	0.394±0.038 R☉
Temperature	(T)	3503±60 K
Metallicity	[Fe/H]	0.090±0.090
Age		null Gyr
Physical characteristics
Mass	(m)	null M⊕
Radius	(r)	2.24±0.23 R⊕
Temperature	(T)	272 K (−1 °C; 30 °F)
Orbital elements
Semi-major axis	(a)	0.1491 AU
Eccentricity	(e)	null
Orbital period	(P)	32.94488 d
Inclination	(i)	null°
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.

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.