47 Cygni

47 Cygni (47 Cyg) is a double star in the constellation Cygnus. Its apparent magnitude is 4.66.

The two stars of 47 Cygni are separated by less than an arcsecond. The supergiant primary is a slow irregular variable with an amplitude of about 0.1 magnitudes. The secondary is a hot B class main sequence star, but still 2.5 magnitudes fainter than the primary.