Theta Leonis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 14m 14.40446s |
| Declination | +15° 25′ 46.4541″ |
| Apparent magnitude (V) | +3.324 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A2 V |
| U−B color index | +0.07 |
| B−V color index | –0.02 |
| Astrometry | |
| Radial velocity (Rv) | +7.6 km/s |
| Proper motion (μ) | RA: -60.31 mas/yr Dec.: -79.10 mas/yr |
| Parallax (π) | 19.76±0.17 mas |
| Distance | 165 ± 1 ly (50.6 ± 0.4 pc) |
| Absolute magnitude (MV) | −0.19 |
| Details | |
| Mass | 2.8±0.1 M☉ |
| Radius | 4.03±0.10 R☉ |
| Luminosity | 118±5 L☉ |
| Surface gravity (log g) | 3.65 cgs |
| Temperature | 9,480±120 K |
| Metallicity [Fe/H] | +0.05 dex |
| Rotational velocity (v sin i) | 23 km/s |
| Age | 407±12 Myr |
| Other designations | |
| Chertan, Chort, Coxa, θ Leo, Theta Leo, The Leo, 70 Leo, HR 4359, BD+16 2234, HD 97633, SAO 99512, FK5 423, HIP 54879. | |
| Database references | |
| SIMBAD | data |
Theta Leonis, Latinized from θ Leonis, formally named Chertan, is a star in the equatorial-northern constellation of Leo. With an apparent visual magnitude of +3.324 it is visible to the naked eye and forms one of the brighter stars in the constellation. The distance from the Sun can be directly determined from parallax measurements, yielding a value of about 165 light-years (51 parsecs).