Mass of each black hole   M    =   10 solar masses  =  2 x 10^(31) kg

    Radius of black holes     RBH  =   30 km

    Radius of orbit           R    =   2 RBH   =  60 km

    Velocity in orbit         v    =   0.75 x 10^(8) m/s   =   0.25 c

    Distance from Earth       D    =   340 Mpc   =  1 x 10^(25) m