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] |
| Characteristics | |
| Spectral type | B9.5Vs[2] |
| U−B color index | –0.12[3] |
| B−V color index | –0.06[3] |
| Astrometry | |
| 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) |
| Details | |
| 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 | |
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.
Name
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]
References
- 1 2 3 4 5 Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P.
- 1 2 3 "sig Leo -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-23.
- 1 2 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.
- ↑ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495.....
- 1 2 3 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:0712.3664. Bibcode:2008MNRAS.385..481L. doi:10.1111/j.1365-2966.2008.12856.x.
- ↑ 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/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855
- ↑ 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.
- ↑ (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.
- ↑ (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.
- ↑ (Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑
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