20 Leonis Minoris
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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 LMi, GJ 376, HR 3951, BD +32°1964, HD 86728, LHS 2216, LTT 12671, GCTP 2366.00, SAO 61808, FK5 1258, HIP 49081. [5] |
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.
[edit] References
- ^ a b c d e van Leeuwen, F. (2007), "HIP 49081", Hipparcos, the New Reduction, http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=48928, retrieved 2009-12-18
- ^ a b 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, Bibcode 2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101 . See Table 10.
- ^ Kovtyukh et al.; 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, http://www.aanda.org/articles/aa/full/2003/46/aa3944/aa3944.html
- ^ 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, Bibcode 2008ApJ...687.1264M, doi:10.1086/591785
- ^ "HD 86728 -- High proper-motion Star", Simbad Astronomical Object Database, http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD+86728, 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, http://www.blackwell-synergy.com/doi/abs/10.1046/j.1365-8711.2000.03060.x
[edit] External links
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In left column are stellar classes of primary members of star systems. ‡Distance error margin extends out of declared distance interval. Italic are systems possibly located within declared distance interval, but probably not.
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