We report the discovery of three low surface brightness companions to the spiral galaxy NGC 4631 , made with small amateur telescopes .
Assuming their distances to be 7.4 Mpc , the same as that of NGC 4631 , the absolute magnitudes and linear diameters of the dwarfs are ranged within [ -12.5 , -9.6 ] mag and [ 4.7 - 1.3 ] kpc , respectively .
These new three dwarfs , together with the discovered by us diffuse structure called “ bridge ” , look like parts of a tidal filament directed towards NGC 4656 at total extended over 100 kpc .