Sigma Leonis

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Sigma Leonis
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 21m 08.1943s[1]
Declination +06° 01′ 45.558″[1]
Apparent magnitude (V) 4.044[2]
Spectral type B9.5Vs[2]
U−B color index –0.12[3]
B−V color index –0.06[3]
Radial velocity (Rv) –5.3[4] km/s
Proper motion (μ) RA: –91.76[1] mas/yr
Dec.: –12.83[1] mas/yr
Parallax (π) 15.24 ± 0.81[1] mas
Distance 210 ± 10 ly
(66 ± 3 pc)
Radius 3.3[5] R
Surface gravity (log g) 3.83 ± 0.03[6] cgs
Temperature 10,250[5] K
Metallicity [Fe/H] +0.0[5] dex
Rotational velocity (v sin i) 70[7] km/s
Other designations
77 Leo, HR 4386, BD+06 2437, HD 98664, SAO 118804, FK5 427, HIP 55434.[2]
Database references

Sigma Leonis (σ Leo) is a blue-white 4th-magnitude star in the constellation Leo.

Sigma Leonis is of the spectral class B9.5Vs and has an apparent magnitude of +4.04.


In Chinese, 太微右垣 (Tài Wēi Yòu Yuán), meaning Right Wall of Supreme Palace Enclosure, refers to an asterism consisting of σ Leonis, β Virginis, ι Leonis, θ Leonis and δ Leonis.[8] Consequently, σ Leonis itself is known as 太微右垣二 (Tài Wēi Zuǒ Yuán èr, English: the Second Star of Right Wall of Supreme Palace Enclosure.),[9] representing 西上將 (Xīshǎngjiāng), meaning The First Western General.[10] 西上將 (Xīshǎngjiāng), spelled Shang Tseang by R.H. Allen, means "the Higher General" [11]


  1. ^ a b c d e Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P. 
  2. ^ a b c "sig Leo -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-23. 
  3. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J. 
  4. ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. 
  5. ^ a b c Lipski, Ł.; Stȩpień, K. (March 2008). "Effective temperatures of magnetic chemically peculiar stars from full spectral energy distributions". Monthly Notices of the Royal Astronomical Society. 385 (1): 481–492. arXiv:0712.3664Freely accessible. Bibcode:2008MNRAS.385..481L. doi:10.1111/j.1365-2966.2008.12856.x. 
  6. ^ Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal, 129 (3): 1642–1662, arXiv:astro-ph/0412542Freely accessible, Bibcode:2005AJ....129.1642F, doi:10.1086/427855 
  7. ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago. 239 (1). Bibcode:1970CoAsi.239....1B. 
  8. ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  9. ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
  10. ^ (Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name, Hong Kong Space Museum. Accessed on line November 23, 2010.
  11. ^ [1]