20 Leonis Minoris

20 Leonis Minoris
Observation data
Epoch J2000      Equinox J2000
Constellation Leo Minor
Right ascension 10h 01m 00.65688s[1]
Declination +31° 55′ 25.2130″[1]
Apparent magnitude (V) +5.40[2]
Characteristics
Spectral type G3 Va Hδ1[3] + M7 V[4]
U−B color index +0.27[5]
B−V color index +0.65[5]
Astrometry
Radial velocity (Rv)+55.96±0.09[6] km/s
Proper motion (μ) RA: −528.871(92) mas/yr[1]
Dec.: −429.376(74) mas/yr[1]
Parallax (π)66.9958 ± 0.0921 mas[1]
Distance48.68 ± 0.07 ly
(14.93 ± 0.02 pc)
Absolute magnitude (MV)4.46[7]
Details
20 LMi A
Mass0.967±0.010[8] M
Radius1.237±0.019[8] R
Luminosity1.365±0.014[8] L
Surface gravity (log g)4.25±0.02[8] cgs
Temperature5,735±5.6[9] K
Metallicity [Fe/H]0.20±0.02[8] dex
Rotation10.64±0.14 d[2]
Rotational velocity (v sin i)2.4±0.5[8] km/s
Age6.2–7.7[10] Gyr
20 LMi B
Mass0.11[11] M
Rotation19.2687 d[4]
Other designations
20 LMi, BD+32° 1964, FK5 1258, GJ 376, HD 86728, HIP 49081, HR 3951, SAO 61808, LHS 2216, LTT 12671[12]
Database references
SIMBADdata

20 Leonis Minoris is a binary star system in the northern constellation of Leo Minor. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.4.[2] Based upon an annual parallax shift of 66.996 mas, it is located 48.7 light-years from the Sun. The star has a relatively high proper motion[3] and is moving away from the Sun with a radial velocity of +56 km/s.[6] The system made its closest approach about 150,000 years ago when it came within 32.2 ly (9.86 pc).[13]

The primary member of this system is a G-type main-sequence star with a stellar classification of G3 Va Hδ1.[3] It has 12% more mass and a 25% larger radius than the Sun. The star is about seven[10] billion years old and is spinning with a rotation period of 10.6 days.[2] The small companion is an active red dwarf star that has a relatively high metallicity.[14] The two stars are currently separated by 14.5 arc seconds, corresponding to a projected separation of 2016 AU.[11]

  1. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Hempelmann2016 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference West2015 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference EgUBV was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference Gupta2024 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa411_3_559 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference apj687 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Tokovinin2016 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference BailerJones2015 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference mnras311_2_385 was invoked but never defined (see the help page).