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HD 180555

Binary star in the constellation Aquila From Wikipedia, the free encyclopedia

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.[4]

ConstellationAquila[1]
Right ascension19h 16m 26.78744s[2]
Declination+14° 32′ 40.6234″[2]
Apparentmagnitude(V)5.67[3] (5.68 + 9.58)‍[4]
Quick facts Constellation, Right ascension ...
HD 180555
Observation data
Epoch J2000      Equinox ICRS
Constellation Aquila[1]
Right ascension 19h 16m 26.78744s[2]
Declination +14° 32′ 40.6234″[2]
Apparent magnitude (V) 5.67[3] (5.68 + 9.58)‍[4]
Characteristics
Spectral type B9.5V[5] + G0IV[4]
U−B color index −0.12[3]
B−V color index −0.03[3]
Astrometry
Radial velocity (Rv)−19.3[6] km/s
Proper motion (μ) RA: +8.09[2] mas/yr
Dec.: +1.03[2] mas/yr
Parallax (π)7.96±0.60 mas[2]
Distance410 ± 30 ly
(126 ± 9 pc)
Absolute magnitude (MV)+0.17[1]
Orbit[7]
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
Mass2.8[8] M☉
Radius4.1[8] R☉
Luminosity89[8] L☉
Temperature10,107[8] K
Metallicity [Fe/H]−0.27[8] dex
Rotational velocity (v sin i)158[9] km/s
Age339[8] Myr
HD 180555 B
Mass1.1[10] M☉
Radius1.7[10] R☉
Luminosity3.2[10] L☉
Temperature5,935[10] K
Metallicity [Fe/H]−0.24[10] dex
Rotational velocity (v sin i)158[9] km/s
Age6.3[10] Gyr
Other designations
BD+14°3852, HD 180555, HIP 94720, HR 7307, SAO 104668
Database references
SIMBADdata
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