62 Eridani
Binary star system
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62 Eridani (b Eri) is a double star located in the Eridanus constellation and is approximately 720 light-years away. The combined apparent magnitude of the two stars is 5.5.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus[1] |
| Right ascension | 04h 56m 24.18609s[2] |
| Declination | −05° 10′ 16.8710″[2] |
| Apparent magnitude (V) | 5.48[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | B5III[4] |
| B−V colour index | −0.123±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | 24±4.3[5] km/s |
| Proper motion (μ) | RA: −6.395 mas/yr[2] Dec.: −1.809 mas/yr[2] |
| Parallax (π) | 4.5440±0.1145 mas[2] |
| Distance | 720 ± 20 ly (220 ± 6 pc) |
| Absolute magnitude (MV) | −1.23[1] |
| Details | |
| Aa | |
| Mass | 5.69[6] M☉ |
| Ab | |
| Mass | 1.46[6] M☉ |
| Other designations | |
| b Eri, 62 Eridani, BD−05 1091, GC 5894, HD 31512, HIP 22958, HR 1582, SAO 149924, PPM 214891, TYC 5899-1192-1[7] | |
| Database references | |
| SIMBAD | Star |
The two stars are 0.6″ apart and have an estimated orbital period of 633 years. The primary component is a hot blue giant star with a spectral class of B5III and a mass of about 5.7 M☉.[6] Despite the giant luminosity class, it is modelled to still be on the main sequence.[2][8] Other publications have given spectral classes of B5V or B6V.[9] The secondary is magnitude 9.6 and has a mass of about 1.5 M☉.[6]
62 Eridani moves within the galaxy at a speed of 24.2 km/sec relative to the Sun. Its distance from the galactic center is estimated to be between 24,700 and 29,700 light-years.[10]
The 9th-magnitude star BD−05°1093 is a possible common proper motion companion 66″ away.[6]