| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h16m 26.78744s[1] |
| Declination | +14° 32′ 40.6234″[1] |
| Apparent magnitude (V) | 5.67[2] (5.68 + 9.58)[3] |
| Characteristics | |
| Spectral type | B9.5V[4] + G0IV[3] |
| U−B color index | −0.12[2] |
| B−V color index | −0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.3[5] km/s |
| Proper motion (μ) | RA: +8.09[1] mas/yr Dec.: +1.03[1] mas/yr |
| Parallax (π) | 7.96 ± 0.60 mas[1] |
| Distance | 410 ± 30 ly (126 ± 9 pc) |
| Orbit[6] | |
| 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 | |
| Rotational velocity (v sin i) | 158[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 180555 is a binary star in the equatorial constellationofAquila. 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.[3]
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