K2-18
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.
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 | |
| Database references | |
| SIMBAD | data |
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