Rho Leonis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 10h 32m 48.67168s |
| Declination | +09° 18′ 23.7094″ |
| Apparent magnitude (V) | 3.83 - 3.90 |
| Characteristics | |
| Evolutionary stage | Blue loop |
| Spectral type | B1 Iab |
| U−B color index | −0.945 |
| B−V color index | −0.153 |
| Variable type | α Cyg |
| Astrometry | |
| Radial velocity (Rv) | +42.0 km/s |
| Proper motion (μ) | RA: −5.93±0.20 mas/yr Dec.: −3.40±0.11 mas/yr |
| Distance | 2,900±230 ly (900±70 pc) |
| Absolute magnitude (MV) | −6.19±0.2 |
| Details | |
| Mass | 19.9±1.0 M☉ |
| Radius | 28±3 R☉ |
| Luminosity | 151,000+30,600 −25,500 L☉ |
| Surface gravity (log g) | 2.87±0.04 cgs |
| Temperature | 21,700±200 K |
| Metallicity [Fe/H] | −0.06 dex |
| Rotation | 12.5±0.7 days |
| Rotational velocity (v sin i) | 49.0±2.4 km/s |
| Age | 9.12+0.88 −0.91 Myr |
| Other designations | |
| Shaomin, ρ Leo, 47 Leo, BD+10 2166, FK5 396, HD 91316, HIP 51624, HR 4133, SAO 118355 | |
| Database references | |
| SIMBAD | data |
Rho Leonis, also named Shaomin, is a star in the zodiac constellation of Leo, and, like the prominent nearby star Regulus, is near the ecliptic. With an apparent visual magnitude of 3.9, this star can be readily seen with the naked eye. Spectroscopic measurements give a distance estimate of about 2,930 light-years (900 parsecs) from the Earth. Rho Leonis is an Alpha Cygni-type variable star, showing 0.032 magnitude brightness variations with a period of 3.427 days, in Hipparcos data.