Sigma Leonis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Leo |
| Right ascension | 11h 21m 08.1943s |
| Declination | +06° 01′ 45.558″ |
| Apparent magnitude (V) | 4.044 |
| Characteristics | |
| Spectral type | B9.5Vs |
| U−B color index | –0.12 |
| B−V color index | –0.06 |
| Astrometry | |
| Radial velocity (Rv) | –5.3 km/s |
| Proper motion (μ) |
RA: –91.76 mas/yr Dec.: –12.83 mas/yr |
| Parallax (π) | 15.24 ± 0.81mas |
| Distance | 210 ± 10 ly (66 ± 3 pc) |
| Details | |
| Radius | 3.3 R☉ |
| Surface gravity (log g) | 3.83 ± 0.03 cgs |
| Temperature | 10,250 K |
| Metallicity [Fe/H] | +0.0 dex |
| Rotational velocity (v sin i) | 70 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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. 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.), representing 西上將 (Xīshǎngjiāng), meaning The First Western General. 西上將 (Xīshǎngjiāng), spelled Shang Tseang by R.H. Allen, means "the Higher General"
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