Chi Leonis
Double star system in the constellation Leo
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Chi Leonis, Latinized from χ Leonis, is a double star in the constellation Leo. It is visible to the naked eye with an apparent visual magnitude of 4.63.[2] The distance to this star, as determined using parallax measurements,[1] is around 95 light years. It has an annual proper motion of 346 mas.[10]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 05m 01.02754s[1] |
| Declination | +07° 20′ 09.6235″[1] |
| Apparent magnitude (V) | 4.63[2] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | F2III-IVv[4] |
| U−B color index | +0.06[2] |
| B−V color index | +0.33[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.7[5] km/s |
| Proper motion (μ) | RA: −344.28[1] mas/yr Dec.: −47.65[1] mas/yr |
| Parallax (π) | 34.49±0.20 mas[1] |
| Distance | 94.6 ± 0.5 ly (29.0 ± 0.2 pc) |
| Absolute magnitude (MV) | +2.31[6] |
| Details | |
| Mass | 1.62[7] M☉ |
| Radius | 1.99[8] R☉ |
| Luminosity | 9.9[6] L☉ |
| Surface gravity (log g) | 4.02[7] cgs |
| Temperature | 7022±80[7] K |
| Metallicity [Fe/H] | +0.03[7] dex |
| Rotational velocity (v sin i) | 25±1[4] km/s |
| Age | 1.40[7] Gyr |
| Other designations | |
| χ Leo, 63 Leo, BD+08°2455, FK5 418, HD 96097, HIP 54182, HR 4310, SAO 118648[9] | |
| Database references | |
| SIMBAD | data |
This is most likely a binary star system.[11] The primary component has a stellar classification of F2III-IVv, which at first would classify it as a F-type star between the giant and subgiant evolutionary stages,[4] but evolutionary models suggest the star is instead in the main sequence.[3][12] It has an estimated 162% of the Sun's mass[7] and nearly twice the Sun's radius.[8] The companion is a magnitude 11.0 star at an angular separation of 4.1″ along a position angle of 264°, as of 1990.[13]