20 Leonis Minoris

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
Distance49.1 ± 0.2 ly
(15.05 ± 0.07 pc)
Absolute magnitude (MV)4.53
Details
Radius1.247 ± 0.021[2] R☉
Luminosity1.378 ± 0.027[2] L☉
Temperature5735 ± 5.6[3] K
Age6.2–7.7[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

  1. 1 2 3 4 5 van Leeuwen, F. (2007), "HIP 49081", Hipparcos, the New Reduction, retrieved 2009-12-18
  2. 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:1112.3316Freely accessible, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101. See Table 10.
  3. ↑ 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/0308429Freely accessible, 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:0807.1686Freely accessible, 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


This article is issued from Wikipedia - version of the 9/30/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.