K2-18

K2-18
	; Artist's impression of the K2-18 system, with K2-18 on left, K2-18b on right, and K2-18c between.; Credit: ESA/Hubble
	Approximate two-dimensional location of the star (in red circle); Sigma Leonis is the nearest bright star, which is in a southerly direction, and the boundary of Virgo is similarly far.
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Leo
Right ascension	11h 30m 14.51774s
Declination	+07° 35′ 18.2553″
Apparent magnitude (V)	13.50
Characteristics
Evolutionary stage	Red dwarf
Spectral type	M2.8
Astrometry
Radial velocity (Rv)	0.02±0.52 km/s
Proper motion (μ)	RA: −80.479 mas/yr ; Dec.: −133.007 mas/yr
Parallax (π)	26.2469 ± 0.0266 mas
Distance	124.3 ± 0.1 ly ; (38.10 ± 0.04 pc)
Details
Mass	0.495±0.004 M☉
Radius	0.469±0.010 R☉
Luminosity	0.0234 L☉
Temperature	3,503±60 K
Metallicity [Fe/H]	0.123±0.157 dex
Rotation	39.6±0.9 d
Age	2.4±0.6 Gyr
Other designations
	Gaia DR3 3910747531814692736, EPIC 201912552, 2MASS J11301450+0735180
Database references
SIMBAD	data

K2-18, also known as EPIC 201912552, is a red dwarf star with two planetary companions located 124 light-years (38 parsecs) from Earth, in the constellation of Leo.

Its name is due to the fact that it was discovered by the K2 Mission, which extended the mission of the Kepler Space Telescope after failure of two of its reaction wheels.

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