HD 180555

HD 180555
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	5.67 (5.68 + 9.58)‍
Characteristics
Spectral type	B9.5V + G0IV
U−B Template:Engvar	−0.12
B−V Template:Engvar	−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	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd 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 Template:Solar mass
Radius	4.1 Template:Solar radius
Luminosity	89 Template:Solar luminosity
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 Template:Solar mass
Radius	1.7 Template:Solar radius
Luminosity	3.2 Template:Solar luminosity
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

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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 8.32Template:Pprime, but it is unrelated to the system.^[4]

References

Script error: No such module "Check for unknown parameters".

Observation data Epoch J2000 Equinox J2000
Constellation	Aquila^[1]
Right ascension	Template:RA^[2]
Declination	Template:DEC^[2]
Apparent magnitude (V)	5.67^[3] (5.68 + 9.58)‍^[4]
Characteristics
Spectral type	B9.5V^[5] + G0IV^[4]
U−B Template:Engvar	−0.12^[3]
B−V Template:Engvar	−0.03^[3]
Astrometry

Radial velocity (R_v)	−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]
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (M_V)	+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
Mass	2.8^[8] Template:Solar mass
Radius	4.1^[8] Template:Solar radius
Luminosity	89^[8] Template:Solar luminosity
Temperature	10,107^[8] K
Metallicity [Fe/H]	−0.27^[8] dex
Rotational velocity (v sin i)	158^[9] km/s
Age	339^[8] Myr
HD 180555 B
Mass	1.1^[10] Template:Solar mass
Radius	1.7^[10] Template:Solar radius
Luminosity	3.2^[10] Template:Solar luminosity
Temperature	5,935^[10] K
Metallicity [Fe/H]	−0.24^[10] dex
Rotational velocity (v sin i)	158^[9] km/s
Age	6.3^[10] Gyr
Other designations
BD+14°3852, HD 180555, HIP 94720, HR 7307, SAO 104668
Database references
SIMBAD	data