20 Leonis Minoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo Minor |
| Right ascension | 10h 01m 00.66s[1] |
| Declination | +31° 55′ 25.2″[1] |
| Apparent magnitude (V) | 5.40 |
| Characteristics | |
| Spectral type | G3 Va/M6.5 |
| U−B color index | 0.27 |
| B−V color index | 0.65 |
| Astrometry | |
| Radial velocity (Rv) | +56.0 km/s |
| Proper motion (μ) | RA: -527.63 ± 0.30[1] mas/yr Dec.: -429.42 ± 0.18[1] mas/yr |
| Parallax (π) | 66.46 ± 0.32[1] mas |
| Distance | 49.1 ± 0.2 ly (15.05 ± 0.07 pc) |
| Absolute magnitude (MV) | 4.53 |
| Details | |
| Radius | 1.247 ± 0.021[2] R☉ |
| Luminosity | 1.378 ± 0.027[2] L☉ |
| Temperature | 5735 ± 5.6[3] K |
| Age | 6.2–7.7[4] Gyr |
| Other designations | |
20 Leonis Minoris is a binary star system in the constellation Leo Minor. It has a relatively high proper motion. The companion is an old, active red dwarf star that has a relatively high metallicity.[6] The two stars are currently separated by 14.5 arc seconds.
References
- 1 2 3 4 5 van Leeuwen, F. (2007), "HIP 49081", Hipparcos, the New Reduction, retrieved 2009-12-18
- 1 2 Boyajian, Tabetha S.; et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal 746 (1): 101, arXiv:1112.3316, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101. See Table 10.
- ↑ Kovtyukh; Soubiran, C.; Belik, S. I.; Gorlova, N. I. (2003), "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios", Astronomy and Astrophysics 411 (3): 559–564, arXiv:astro-ph/0308429, Bibcode:2003A&A...411..559K, doi:10.1051/0004-6361:20031378
- ↑ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal 687 (2): 1264–1293, arXiv:0807.1686, Bibcode:2008ApJ...687.1264M, doi:10.1086/591785
- ↑ "HD 86728 -- High proper-motion Star", Simbad Astronomical Object Database, retrieved 2006-07-31
- ↑ Gizis, J. E.; et al. (2000), "Two Nearby M Dwarf Binaries from 2MASS" (abstract page), Monthly Notices of the Royal Astronomical Society 311 (2): 385, Bibcode:2000MNRAS.311..385G, doi:10.1046/j.1365-8711.2000.03060.x
External links
- "4C00774". ARICNS. Retrieved 2006-07-31.
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