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Revision as of 21:08, 27 February 2018 by Lithopsian (talk | contribs) (a direct quote (of a web page quoting from an interview) larger than the rest of the article body can hardly be justified, commenting pending rewording of some or all)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)| Observation data Epoch J2000 Equinox J2000 | |
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| Constellation | Leo |
| Right ascension | 11 29 20.39 |
| Declination | −01° 27′ 17.2″ |
| Apparent magnitude (V) | 12.168±0.009 |
| Characteristics | |
| Spectral type | M0V |
| B−V color index | 1.35 ± 0.06 |
| Astrometry | |
| Radial velocity (Rv) | 32.6 ± 1 km/s |
| Proper motion (μ) | RA: 88.3 ± 2.0 mas/yr Dec.: -73.6 ± 2.7 mas/yr |
| Distance | 140 ± 7 ly (42 ± 2 pc) |
| Details | |
| Mass | 0.601 ± 0.089 M☉ |
| Radius | 0.561 ± 0.068 R☉ |
| Temperature | 3896 ± 189 K |
| Metallicity | –0.32 ± 0.13 dex |
| Age | >1 Gyr |
| Other designations | |
| EPIC 201367065, K2-3, WISE J112920.45-012718.0, 2MASS J11292037-0127173 | |
| Database references | |
| SIMBAD | data |
K2-3, also known as EPIC 201367065, is a red dwarf with three known planets. All are Super-Earths, and the outermost is in the habitable zone. 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 about 140 light-years, the star ranks among the top 10 nearest stars known to have transiting planets. 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 at least three confirmed exoplanets:
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 6.6±1.1 M🜨 | 0.0777 | 10.05454 | 0.06 ± 0.06 | 89.59+0.24 −0.40° |
2.29±0.23 R🜨 |
| c | 3.1+1.3 −1.2 M🜨 |
0.1413 | 24.64638 | 0.04 ± 0.04 | 89.70 ± 0.20° | 1.77±0.18 R🜨 |
| d | 2.7+1.2 −0.8 M🜨 |
0.2097 | 44.55764 | 0.045 ± 0.045 | 89.79 ± 0.15° | 1.65 ± 0.17 R🜨 |
References
- ^ "K2-3 PLANET HOST OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-17.
- 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
- ^ "The Extrasolar Planet Encyclopaedia — K2-3 d".
- Three Super-Earths Found Circling Nearby Red Dwarf
- 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.
- https://arxiv.org/pdf/1802.08320.pdf
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