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β Leonis Minoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Leo Minor
Component A B
Right ascension 10h 27m 10h 27m
  52.998s 53.006s
Declination +36° 42′[1] +36° 42′[2]
  25.95″ 26.01″
Apparent magnitude (V) 4.40[3] 6.12[3]
Spectral type G8III-IV[3] F8IV[3]
U-B color index +0.64[3]
B-V color index +0.90[3]
V-R color index 0.5[4]
R-I color index +0.46[3]
Proper motion:  
RA α cos δ)  −134.15[1] mas/yr  −102.97[2] mas/yr 
Dec. δ)  −113.57[1] mas/yr  −95.00[2] mas/yr 
Parallax (π) 22.34 ± 0.87[4] mas
Distance 146 ± 6 ly
(45 ± 2 pc)
Absolute magnitude (MV) 0.96[5]
Mass ~2[6] M 1.35[6] M
Radius 7.8[6] R 2[6] R
Luminosity 36[6] L 5.8[6] L
Temperature 5075[6] K 6200[6] K
Period (P) 38.62 y
Semimajor axis (a) 0.363
Eccentricity (e) 0.668
Inclination (i) 79.1°
Longitude of node (Ω) 41.5°
Periastron epoch (T) B1999.15
Argument of periastron (ω)
Database references
Other designations
β LMi, Beta Leonis Minoris, Beta LMi, 31 Leonis Minoris, 31 LMi, ADS 7780 AB, BD+37 2080, CCDM J10279+3642AB, FK5 390, GC 14358, HD 90537, HIP 51233, HR 4100, PPM 75233, SAO 62053, WDS 10279+3642AB.[4][3][8]

Coordinates: Sky map 10h 27m 53s, +36° 42′ 26″

Beta Leonis Minoris (Beta LMi / β Leonis Minoris / β LMi) is a binary star in the constellation of Leo Minor. It has an overall apparent visual magnitude of approximately 4.215.[4] Although it is the only star in Leo Minor with a Bayer designation, it is only the second brightest star in the constellation (the brightest is 46 Leonis Minoris.)[6]


  1. ^ a b c HIP 51233, record for component 1, Hipparcos catalogue; CDS ID I/239.
  2. ^ a b c HIP 51233, record for component 2, Hipparcos catalogue; CDS ID I/239.
  3. ^ a b c d e f g h HR 4100, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line October 1, 2008.
  4. ^ a b c d e HD 90537 -- Spectroscopic binary, database entry, SIMBAD. Accessed on line October 1, 2008.
  5. ^ From apparent magnitude and parallax.
  6. ^ a b c d e f g h i Beta LMi, Stars, Jim Kaler. Accessed on line October 2, 2008.
  7. ^ Entry 10279+3642, Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory. Accessed on line October 1, 2008.
  8. ^ Entry 10279+3642, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line October 1, 2008.


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