83 Leonis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| 83 Leonis A | |
| Right ascension | 11h 26m 45.32173s |
| Declination | +03° 00′ 47.1566″ |
| Apparent magnitude (V) | 6.45 |
| 83 Leonis B | |
| Right ascension | 11h 26m 46.27833s |
| Declination | +03° 00′ 22.7567″ |
| Apparent magnitude (V) | 7.58 |
| Characteristics | |
| A | |
| Evolutionary stage | main sequence |
| Spectral type | G9IV-V |
| U−B color index | +0.62 |
| B−V color index | +0.85 |
| B | |
| Evolutionary stage | main sequence |
| Spectral type | K2V |
| U−B color index | +1.024 |
| B−V color index | +0.913 |
| Astrometry | |
| 83 Leonis A | |
| Radial velocity (Rv) | 4.18±0.13 km/s |
| Proper motion (μ) | RA: −725.963(29) mas/yr Dec.: 180.980(30) mas/yr |
| Parallax (π) | 55.0090±0.0240 mas |
| Distance | 59.29 ± 0.03 ly (18.179 ± 0.008 pc) |
| Absolute magnitude (MV) | +5.24 |
| 83 Leonis B | |
| Radial velocity (Rv) | 3.63±0.13 km/s |
| Proper motion (μ) | RA: −728.131(34) mas/yr Dec.: 188.554(27) mas/yr |
| Parallax (π) | 55.0618±0.0304 mas |
| Distance | 59.23 ± 0.03 ly (18.16 ± 0.01 pc) |
| Absolute magnitude (MV) | +6.26 |
| Details | |
| 83 Leonis A | |
| Mass | 0.95±0.06 M☉ |
| Radius | 0.96+0.04 −0.02 R☉ |
| Luminosity | 0.74 L☉ |
| Surface gravity (log g) | 4.42 cgs |
| Temperature | 5,509±8.6 K |
| Metallicity | 0.30 |
| Rotational velocity (v sin i) | 5.1 km/s |
| Age | 8.09±6.75 Gyr |
| 83 Leonis B | |
| Mass | 0.85±0.02 M☉ |
| Radius | 0.78±0.02 R☉ |
| Luminosity (bolometric) | 0.418±0.057 L☉ |
| Surface gravity (log g) | 4.57±0.06 cgs |
| Temperature | 4929±44 K |
| Metallicity | 0.3±0.03 |
| Rotation | 40-45 days |
| Rotational velocity (v sin i) | 0.41±0.5 km/s |
| Age | 4.8±4.1 Gyr |
| Other designations | |
| GJ 429, HR 4414, WDS J11268+0301 | |
| A: BD+03°2502, HD 99491, HIP 55846, Wolf 393 | |
| B: BD+03°2503, HD 99492, HIP 55848, Wolf 394 | |
| Database references | |
| SIMBAD | data |
| HD 99491 | |
| HD 99492 | |
83 Leonis, abbreviated 83 Leo, is a binary star system approximately 59 light-years away in the constellation of Leo (the Lion). The primary star of the system is a cool orange subgiant star, while the secondary star is an orange dwarf star. The two stars are separated by at least 515 astronomical units from each other, and have a combined apparent magnitude of 6.12. Both stars are presumed to be cooler than the Sun.
The primary star is also known as HD 99491 and the secondary star as HD 99492. In 2005, an exoplanet was confirmed to be orbiting the secondary star within the system.