K2-3b

K2-3b, also known as EPIC 201367065 b, is an exoplanet orbiting the red dwarf K2-3 every 10 days.^[3][4] It is the largest and most massive planet of the K2-3 system, with about 2.1 times the radius of Earth and about 5 times the mass.^[2] Its density of about 3.1 g/cm³ may indicate a composition of almost entirely water, or a hydrogen envelope comprising about 0.7% of the planet's mass.^[5]

K2-3b

Discovery[1]
Discovery site	Kepler Space Observatory
Discovery date	2015
Detection method	Transit
Orbital characteristics[2]
Semi-major axis	0.0747+0.0013 −0.0012 AU
Eccentricity	0.107+0.057 −0.059
Orbital period (sidereal)	10.0546535+0.0000088 −0.0000091 d
Inclination	89.40°+0.34° −0.22°
Argument of periastron	188°+32° −34°
Semi-amplitude	2.27±0.28 m/s
Star	K2-3
Physical characteristics[2]
Mean radius	2.078+0.076 −0.067 R🜨
Mass	5.11+0.65 −0.64 M🜨
Mean density	3.11+0.49 −0.46 g/cm3
Temperature	501.3+5.1 −5.2 K (228.2 °C; 442.7 °F, equilibrium)