Trajectories of the nanodust particles released from the orbit of the comet Ikeya–Seki before perihelium, at the heliocentric distances of 25 and 7 R_S. The solid lines are the trajectories (projected onto the (r, v_r) plane) obtained solving numerically the equations of motion for the nanodust particles with Q∕m = 10⁻⁴ e/m_p, β  =   0.1. The dashed lines are obtained from Eqs. (12) and (13).