Prime dust clouds ejected by a point source at the same time. The direction of the asteroid motion (apex) is shown relative to the direction toward the Sun. The cross sections of number density (m⁻³) in the orbital plane of the source are shown at 50 minutes after ejection. The black dot indicates the position of the asteroid center at the same time. The total number of dust particles in each prime cloud is the same (10⁵ grains) with fixed grain sizes that correspond in each case to values of the parameter μ_R of GM_{S un}, 0.4GM_{S un}, −0.2GM_{S un}, which determines the dust dynamics. The centers of these prime clouds lie on a synchrone.