Mu Leonis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 52m 45.81654s |
| Declination | +26° 00′ 25.0319″ |
| Apparent magnitude (V) | 3.88 |
| Characteristics | |
| Evolutionary stage | Red giant branch |
| Spectral type | K2 IIIb CN1 Ca1 |
| U−B color index | +1.38 |
| B−V color index | +1.23 |
| Astrometry | |
| Radial velocity (Rv) | 14.03±0.19 km/s |
| Proper motion (μ) | RA: −217.31 mas/yr Dec.: −54.26 mas/yr |
| Parallax (π) | 26.28±0.16 mas |
| Distance | 124.1 ± 0.8 ly (38.1 ± 0.2 pc) |
| Absolute magnitude (MV) | +0.83 |
| Details | |
| Mass | 1.5±0.1 M☉ |
| Radius | 11.89±0.11 R☉ |
| Luminosity | 53±1 L☉ |
| Surface gravity (log g) | 2.43±0.06 cgs |
| Temperature | 4,519±23 K |
| Metallicity [Fe/H] | 0.27±0.03 dex |
| Rotational velocity (v sin i) | 4.5 km/s |
| Age | 3.35±0.70, ~5.0 Gyr |
| Other designations | |
| Rasalas, Alshemali, μ Leo, 24 Leonis, BD+26°2019, HD 85503, HIP 48455, HR 3905, SAO 81064 | |
| Database references | |
| SIMBAD | data |
Mu Leonis (μ Leonis, abbreviated Mu Leo, μ Leo), also named Rasalas /ˈræsəlæs/, is a star in the constellation of Leo. The apparent visual magnitude of this star is 3.88, which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 0.02628 arc seconds as measured by the Hipparcos satellite, this system is 124 light-years (38.1 parsecs) from the Sun. In 2014, an exoplanet was discovered to be orbiting the star.