Back رأس الأسد الجنوبي Arabic Ras Elased Australis AST Ras Elased Australis German Ras Elased Australis Spanish اپسیلون شیر Persian Epsilon Leonis French אלג'נובי HE Epsilon Leonis ID Epsilon Leonis Italian しし座イプシロン星 Japanese
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 45m 51.07330s[1] |
| Declination | 23° 46′ 27.3208″[1] |
| Apparent magnitude (V) | 2.98[2] |
| Characteristics | |
| Spectral type | G1 II[3] |
| U−B color index | +0.47[2] |
| B−V color index | +0.808[4] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | 4.86 ± 0.33[4] km/s |
| Proper motion (μ) | RA: –45.61[1] mas/yr Dec.: –9.21[1] mas/yr |
| Parallax (π) | 13.22 ± 0.15 mas[1] |
| Distance | 247 ± 3 ly (75.6 ± 0.9 pc) |
| Absolute magnitude (MV) | –1.49[6] |
| Details | |
| Mass | 3.71±0.04[7] M☉ |
| Radius | 21.03+0.31 −0.32[7] R☉ |
| Luminosity | 282±13[8] L☉ |
| Surface gravity (log g) | 2.36±0.05[8] cgs |
| Temperature | 5,314±17[8] K |
| Metallicity [Fe/H] | −0.03±0.11[8] dex |
| Rotational velocity (v sin i) | 8.1[4] km/s |
| Age | 210±0[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Leonis (ε Leo, ε Leonis) is the fifth-brightest star in the constellation Leo, consistent with its Bayer designation Epsilon. It is known as Algenubi or Ras Elased Australis. Both names mean "the southern star of the lion's head". Australis is Latin for "southern" and Genubi is Arabic for "south".
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