Beta Aquilae

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**Beta Aquilae A/B**
Observation data Epoch J2000
Image:Beta Aquilae.jpg Beta Aquilae
Constellation (pronunciation)	Aquila
Right ascension	19^h 55^m 18.8^s
Declination	+06° 24′ 24″
Apparent magnitude (V)	3.71/11.4
Characteristics
Spectral type	G8 IVvar/M3
U-B color index	0.48
B-V color index	0.86
Variable type	Suspected
Astrometry
Radial velocity (R_v)	-40.3 km/s
Proper motion (μ)	RA: 46.35 mas/yr Dec.: -481.32 mas/yr
Parallax (π)	72.95 ± 0.83 mas
Distance	44.7 ± 0.5 ly (13.7 ± 0.2 pc)
Absolute magnitude (M_V)	3.03/10.7
Details
Mass	1.3 M_☉
Radius	3.1 R_☉
Luminosity	6 L_☉
Temperature	5,100 K
Metallicity	?
Rotation	~16 km/s.
Age	? years
Visual binary orbit
Companion	β Aql B
Semimajor axis (a)	12.9"
Inclination (i)	6°
Visual binary orbit
Companion	β Aql C
Semimajor axis (a)	175"
Inclination (i)	348°
Other designations
Alshain, Alschairn, 60 Aquilae, Gl 771, HR 7602, BD +06°4357, HD 188512, LHS 5350a, LTT 15822, GCTP 4705.00, SAO 125235, FK5 749, GC 27587, ADS 13110, CCDM 19553+0625, HIP 98036.
Database references
SIMBAD	data

Beta Aquilae (β Aql / β Aquilae) is a star in the constellation Aquila. It also has the traditional name Alshain from the Arabic term الشاهين aš-šāhīn "the (peregrine) falcon". This pseudo-Arabic name is derived from the Persian Šāhīn tarāzū (or possibly Šāhīn tara zed; see γ Aquilae), the Persian name for the asterism α, β and γ Aquilae. In Persian, Šāhīn means "royal falcon", "beam", and "pointer".

Beta Aquilae has magnitude 3.71 and is of spectral class G8IV. It is approximately 44.7 light years from Earth. It has a 12th magnitude companion, β Aquilae B, which is 13 arcseconds away on the sky.