K2-239
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sextans |
| Right ascension | 10h 42m 22.63s[1] |
| Declination | +04° 26′ 28.86″[1] |
| Apparent magnitude (V) | 14.549[2] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M3V[2] |
| Astrometry | |
| Proper motion (μ) | RA: −42.265[3] mas/yr Dec.: 3.976[3] mas/yr |
| Parallax (π) | 32.1414 ± 0.0851[3] mas |
| Distance | 101.5 ± 0.3 ly (31.11 ± 0.08 pc) |
| Details | |
| Mass | 0.40 ± 0.01[2] M☉ |
| Radius | 0.36 ± 0.01[2] R☉ |
| Luminosity | 0.016 ± 0.001[2] L☉ |
| Surface gravity (log g) | 4.9 ± 0.1[2] cgs |
| Temperature | 3420 ± 18[2] K |
| Metallicity [Fe/H] | -0.1 ± 0.1[2] dex |
| Other designations | |
EPIC 248545986 | |
| Database references | |
| SIMBAD | data |
K2-239 (also designated EPIC 248545986) is a small red dwarf star in the constellation Sextans, about 49 parsecs (160 light-years) away from Earth. Observed by the Kepler Space Telescope during Campaign 14 of its K2 "Second Light" mission, it was found to have three hot, likely rocky Earth-sized planets in orbit around it.[2][4]
Stellar characteristics[]
K2-239 is a small red dwarf star of spectral class M3V. It is 40% the mass and 36% the radius of the Sun with just 0.016 times the luminosity. It has a temperature of 3420 K and its age is unknown.[2] For comparison, the Sun has a temperature of 5778 K and is 4.5 billion years old. K2-239 has a visual magnitude of 14.549, far too dim to see with the unaided eye. It is also one of the closer systems found by Kepler, only about 160 light-years away from Earth.[2]
Planetary System[]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.4 ± 0.4 M
|