HD 180555
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 16m 26.78744s |
| Declination | +14° 32′ 40.6234″ |
| Apparent magnitude (V) | 5.67 (5.68 + 9.58) |
| Characteristics | |
| Spectral type | B9.5V + G0IV |
| U−B color index | −0.12 |
| B−V color index | −0.03 |
| Astrometry | |
| Radial velocity (Rv) | −19.3 km/s |
| Proper motion (μ) | RA: +8.09 mas/yr Dec.: +1.03 mas/yr |
| Parallax (π) | 7.96±0.60 mas |
| Distance | 410 ± 30 ly (126 ± 9 pc) |
| Absolute magnitude (MV) | +0.17 |
| Orbit | |
| Period (P) | 13.673±0.069 yr |
| Semi-major axis (a) | 0.0583±0.0014″ |
| Eccentricity (e) | 0.022±0.010 |
| Inclination (i) | 131.3±3.7° |
| Longitude of the node (Ω) | 242.3±4.5° |
| Periastron epoch (T) | B 2008.572±1.101 |
| Argument of periastron (ω) (secondary) | 262.7±28.7° |
| Details | |
| HD 180555 A | |
| Mass | 2.8 M☉ |
| Radius | 4.1 R☉ |
| Luminosity | 89 L☉ |
| Temperature | 10,107 K |
| Metallicity [Fe/H] | −0.27 dex |
| Rotational velocity (v sin i) | 158 km/s |
| Age | 339 Myr |
| HD 180555 B | |
| Mass | 1.1 M☉ |
| Radius | 1.7 R☉ |
| Luminosity | 3.2 L☉ |
| Temperature | 5,935 K |
| Metallicity [Fe/H] | −0.24 dex |
| Rotational velocity (v sin i) | 158 km/s |
| Age | 6.3 Gyr |
| Other designations | |
| BD+14°3852, HD 180555, HIP 94720, HR 7307, SAO 104668 | |
| Database references | |
| SIMBAD | data |
HD 180555 is a binary star in the equatorial constellation of Aquila. It consists of a two stars, orbiting with an orbital period of 8.95 years and an eccentricity of 0.43. A third component lies at an angular separation of 8.32″, but it is unrelated to the system.