Theta Leonis
Theta Leonis, Latinized from θ Leonis, formally named Chertan, is a star in the 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).
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 14m 14.40446s |
| Declination | +15° 25′ 46.4541″ |
| Apparent magnitude (V) | +3.324 |
| Characteristics | |
| 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 | 2.5 M☉ |
| Luminosity | 141 L☉ |
| Surface gravity (log g) | 3.65 cgs |
| Temperature | 9,350 K |
| Metallicity [Fe/H] | +0.05 dex |
| Rotational velocity (v sin i) | 23 km/s |
| Age | 550 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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