K2-3
Red dwarf star in the constellation Leo
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K2-3, also known as EPIC 201367065,[8] is a red dwarf star with three known planets. It is on the borderline of being a late orange dwarf/K-type star, but because of its temperature, it is classified as a red dwarf (4,000 K is typically the division line between spectral class M and K).
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo[1] |
| Right ascension | 11h 29m 20.39171s[2] |
| Declination | −01° 27′ 17.2817″[2] |
| Apparent magnitude (V) | 12.168±0.009[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[4] |
| Spectral type | M0±0.5[4] |
| Apparent magnitude (J) | 9.421±0.027[5] |
| Apparent magnitude (H) | 8.805±0.044[5] |
| Apparent magnitude (K) | 8.561±0.021[5] |
| Variable type | Planetary transit[4] |
| Astrometry | |
| Radial velocity (Rv) | 30.24±0.46[2] km/s |
| Proper motion (μ) | RA: 94.116 mas/yr[2] Dec.: −78.003 mas/yr[2] |
| Parallax (π) | 22.7374±0.0220 mas[2] |
| Distance | 143.4 ± 0.1 ly (43.98 ± 0.04 pc) |
| Details[6] | |
| Mass | 0.549+0.029 −0.027 M☉ |
| Radius | 0.546+0.018 −0.016 R☉ |
| Luminosity (bolometric) | 0.0587+0.0018 −0.0019 L☉ |
| Surface gravity (log g) | 4.704+0.023 −0.026 cgs |
| Temperature | 3844+61 −63 K |
| Metallicity [Fe/H] | −0.157+0.075 −0.080 dex |
| Rotation | 40±2 d[7] |
| Age | 6.9±4.7 Gyr |
| Other designations | |
| EPIC 201367065, 2MASS J11292037-0127173, WISE J112920.45-012718.0, Gaia DR3 3796690380302214272[8] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
At a distance of 143 light-years (44 parsecs),[2] the star's proximity means it is bright enough to make it feasible for astronomers to study the planets' atmospheres to determine whether they are like Earth's atmosphere and possibly conducive to life.
Planetary system
K2-3 has three confirmed exoplanets, discovered in 2015.[4] All are low-density super-Earths or sub-Neptunes, with the outermost orbiting near the inner edge of the habitable zone.[9][6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 5.11+0.65 −0.64 M🜨 |
0.0778±0.0026 | 10.054626(0) | <0.094 | 89.588+0.12 −0.100° |
2.078+0.076 −0.067 R🜨 |
| c | 2.68±0.85 M🜨 | 0.1414±0.0047 | 24.646582(39) | <0.095 | 89.905+0.066 −0.088° |
1.582+0.057 −0.051 R🜨 |
| d | <1.6 M🜨 | 0.2097±0.0070 | 44.556456(97) | <0.097 | 89.788+0.033 −0.029° |
1.458+0.056 −0.051 R🜨 |