83 Leonis
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. Both stars are presumed to be cooler than the Sun.
| 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) | 6.49 |
| 83 Leonis B | |
| Right ascension | 11h 26m 46.27833s |
| Declination | +03° 00′ 22.7567″ |
| Apparent magnitude (V) | 7.58 |
| Characteristics | |
| Spectral type | G9IV-V / K2V |
| U−B color index | 1.024 (83 Leonis B) |
| B−V color index | 0.913 (83 Leonis B) |
| Variable type | None |
| 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) |
| 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) |
| 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 | 5509 ± 8.6 K |
| Metallicity | 0.30 |
| 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 | |
| Database references | |
| SIMBAD | HD 99491 |
| HD 99492 | |
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.
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