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[1]
Declination +07° 35′ 18.2553″[1]
Apparent magnitude (V) 13.50[2]
Characteristics
Evolutionary stage Red dwarf
Spectral type M2.8[3]
Astrometry
Radial velocity (Rv)0.02±0.52[1] km/s
Proper motion (μ) RA: −80.479 mas/yr[1]
Dec.: −133.007 mas/yr[1]
Parallax (π)26.2469 ± 0.0266 mas[1]
Distance124.3 ± 0.1 ly
(38.10 ± 0.04 pc)
Details
Mass0.495±0.004[4] M☉
Radius0.469±0.010[4] R☉
Luminosity0.0234[5] L☉
Temperature3,503±60[4] K
Metallicity [Fe/H]0.123±0.157[6] dex
Rotation39.6±0.9 d[7]
Age2.4±0.6[7] Gyr
Other designations
Gaia DR3 3910747531814692736, EPIC 201912552, 2MASS J11301450+0735180[8]
Database references
SIMBADdata

K2-18, also known as EPIC 201912552, is a red dwarf star with two planetary companions located 124 light-years (38 parsecs)[4] 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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  4. ^ a b c d Cite error: The named reference Cloutier2019 was invoked but never defined (see the help page).
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  7. ^ a b Cite error: The named reference guinan2019 was invoked but never defined (see the help page).
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