Maximum eccentricity of the parent body orbit consistent with trapping of the emitted nanodust. The nanodust particle is emitted at perihelium. The cases illustrated are no corotation (solid line), maximum corotation (dotted line), and the model of Weber and Davis (dashed line). The curves correspond to particles emitted at the points of maximum heliolatitude from the orbits of 20° inclination (curves on the left) and of 70° inclination (curves on the right).