| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo1 |
| Right ascension | 11h 29m 20.39171s2 |
| Declination | −01° 27′ 17.2817″2 |
| Apparent magnitude (V) | 12.168±0.0093 |
| Characteristics | |
| Evolutionary stage | Main sequence4 |
| Spectral type | M0±0.54 |
| Apparent magnitude (J) | 9.421±0.0275 |
| Apparent magnitude (H) | 8.805±0.0445 |
| Apparent magnitude (K) | 8.561±0.0215 |
| Variable type | Planetary transit4 |
| Astrometry | |
| Radial velocity (Rv) | 30.24±0.462 km/s |
| Proper motion (μ) | RA: 94.116 mas/yr2 Dec.: −78.003 mas/yr2 |
| Parallax (π) | 22.7374±0.0220 mas2 |
| Distance | 143.4 ± 0.1 ly (43.98 ± 0.04 pc) |
| Details6 | |
| 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 d7 |
| Age | 6.9±4.7 Gyr |
| Other designations | |
| EPIC 201367065, 2MASS J11292037-0127173, WISE J112920.45-012718.0, Gaia DR3 37966903803022142728 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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).
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.96
| 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🜨 |
References
References
- Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H. 2336. Bibcode:2016yCat.2336....0H.Vizier catalog entry
- Crossfield, Ian J. M.; et al. (2015). "A Nearby M Star with Three Transiting Super-Earths Discovered by K2". The Astrophysical Journal. 804 (1) 10. arXiv:1501.03798. Bibcode:2015ApJ...804...10C. doi:10.1088/0004-637X/804/1/10.
- Skrutskie, M. F.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. Vizier catalog entry
- Diamond-Lowe, Hannah; et al. (2022-11-01). "The K2-3 System Revisited: Testing Photoevaporation and Core-powered Mass Loss with Three Small Planets Spanning the Radius Valley". The Astronomical Journal. 164 (5) 172. arXiv:2207.12755. Bibcode:2022AJ....164..172D. doi:10.3847/1538-3881/ac7807.
- Kosiarek, Molly R.; et al. (2019). "Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, and d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits". The Astronomical Journal. 157 (3) 97. arXiv:1812.08241. Bibcode:2019AJ....157...97K. doi:10.3847/1538-3881/aaf79c. S2CID 119440420.
- "K2-3". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-04-19.
- Damasso, M.; et al. (2018). "Eyes on K2-3: A system of three likely sub-Neptunes characterized with HARPS-N and HARPS". Astronomy & Astrophysics. 615 A69. arXiv:1802.08320. Bibcode:2018A&A...615A..69D. doi:10.1051/0004-6361/201732459.
- Bonomo, A. S.; et al. (2023). "Cold Jupiters and improved masses in 38 Kepler and K2 small planet systems from 3661 HARPS-N radial velocities: No excess of cold Jupiters in small planet systems". Astronomy & Astrophysics. 677 A33. arXiv:2304.05773. Bibcode:2023A&A...677A..33B. doi:10.1051/0004-6361/202346211.