Cygnus
Guanxing Tianjin xing
Right ascension 20 hours 4 1 m 25.9 seconds
Declination +45 16' 49
Apparent magnitude (V) 1.25 spectral classification A2 Ia
B-V color index +0.09
U-B color index? 0.24
Alpha radial velocity (Rv) of Cygnus variabilis? 4.5 km/s
Since (μ) ra: 1.99 mass/year
1Feb: 1.95 mas/year parallax (π) 1.2 1.32 mas
The distance is about ly (about 0.807 PC)
Absolute magnitude (MV)? 8.37
Other naming
α Cygni，αCyg，50 Cyg，Arided，Aridif，Gallina，Arrioph，HR 7924，BD +44 354 1，HD 197345，SAO 4994 1，FK5:777，HIP 102098 .