Trajectories in the (r, v_r) plane of the nanodust particle in the models with constant (model 1) and r-dependent (model 2) solar wind speed obtained by numerical solution of the equation of motion. The particle with Q∕m = 10⁻⁵ e/m_p is emitted from the inbound part of the orbit of the comet Ikeya–Seki at initial heliocentric distance of 0.02 AU. The r-dependent solar wind case corresponds to a slight outward shift in the perihelium distance.