Epsilon Leonis
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".
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 45m 51.07330s |
| Declination | 23° 46′ 27.3208″ |
| Apparent magnitude (V) | 2.98 |
| Characteristics | |
| Spectral type | G1 II |
| U−B color index | +0.47 |
| B−V color index | +0.808 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | 4.86 ± 0.33 km/s |
| Proper motion (μ) | RA: –45.61 mas/yr Dec.: –9.21 mas/yr |
| Parallax (π) | 13.22 ± 0.15 mas |
| Distance | 247 ± 3 ly (75.6 ± 0.9 pc) |
| Absolute magnitude (MV) | –1.49 |
| Details | |
| Mass | 4.01 M☉ |
| Radius | 21 R☉ |
| Luminosity | 288 L☉ |
| Surface gravity (log g) | 2.2 cgs |
| Temperature | 5,248 K |
| Metallicity [Fe/H] | –0.28 dex |
| Rotational velocity (v sin i) | 8.1 km/s |
| Age | 162 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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