HD 131473
Binary star system in the constellation of Boötes
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HD 131473 is a binary star system in the northern constellation of Boötes. The primary is an F-type subgiant with a stellar classification of F4IV, while its companion is a G-type subgiant with a stellar classification of G1IV,[5] and both are somewhat more massive than the Sun.[9] They perform a rather eccentric orbit once every 313 years.[8]
Right ascension14h 53m 23.34844s[2]
Declination+15° 42′ 18.602″[2]
Apparentmagnitude(V)6.403[3] (6.89 / 7.55)[4]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 14h 53m 23.34844s[2] |
| Declination | +15° 42′ 18.602″[2] |
| Apparent magnitude (V) | 6.403[3] (6.89 / 7.55)[4] |
| Characteristics | |
| Spectral type | F4IV / G1IV[5] |
| U−B color index | +0.122[3] |
| B−V color index | +0.570[3] |
| Astrometry | |
| Radial velocity (Rv) | 20.8[6] km/s |
| Proper motion (μ) | RA: −22.72[2] mas/yr Dec.: +21.58[2] mas/yr |
| Parallax (π) | 20.99±0.93 mas[2] |
| Distance | 155 ± 7 ly (48 ± 2 pc) |
| Absolute magnitude (MV) | 2.98[7] |
| Orbit[8] | |
| Period (P) | 313 yr |
| Semi-major axis (a) | 1.358″ |
| Eccentricity (e) | 0.50 |
| Inclination (i) | 108.5° |
| Longitude of the node (Ω) | 12.5° |
| Periastron epoch (T) | 1824.0 |
| Argument of periastron (ω) (secondary) | 49° |
| Details | |
| HD 131473 A | |
| Mass | 1.34[9] M☉ |
| HD 131473 B | |
| Mass | 1.19[9] M☉ |
| Other designations | |
| BD+16°2705, HD 131473, HIP 72846, HR 5550, SAO 101273[10] | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
An M7.5 star 50″ from HD 131473 is a common proper motion companion. Any orbit around the inner pair would take tens of thousands of years.[11]
