8 Cygni

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8 Cygni[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 19h 31m 46.3218s
Declination +34° 27′ 10.686″
Apparent magnitude (V) 4.72
Spectral type B3IV
U−B color index -0.66
B−V color index -0.13
Radial velocity (Rv) -21.8 km/s
Proper motion (μ) RA: 1.06 mas/yr
Dec.: -3.58 mas/yr
Parallax (π) 5.20 ± 0.55 mas
Distance approx. 630 ly
(approx. 190 pc)
Radius 5.4[2] R
Temperature 18,855 ± 445[2] K
Other designations
8 Cygni, BD+34°3590, HD 184171, HIP 96052, HR 7426, SAO 68447.

8 Cygni is a 5th magnitude star in the constellation Cygnus, approximately 630 light years away from Earth. It is a bluish white subgiant star of the spectral type B3IV. Its surface temperature is 11,000 to 25,000 kelvins. Its surface is therefore at least twice as hot as that of our Sun, and it is larger and many times brighter in comparison.[1]


  1. ^ a b "Simbad Query Result". Simbad. Retrieved October 15, 2007. 
  2. ^ a b Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601