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.

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007), HIP 49081, Hipparcos, the New Reduction, retrieved 2009-12-18 
  2. ^ 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, arXiv:1112.3316, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101 . See Table 10.
  3. ^ 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 
  4. ^ 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 
  5. ^ HD 86728 -- High proper-motion Star, Simbad Astronomical Object Database, retrieved 2006-07-31 
  6. ^ 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[edit]