Orbiting parent body. Trajectories of the particles seen from above for the five structures in the case of a rotating parent body (see Sects. 3.2.1 and 3.2.2 for details). Left: model without constraints. Middle: particles going toward the observer. Right: particles going away from the observer. For each structure five similar trajectories, sometimes superimposed, are displayed corresponding to best fits obtained when the reference structure is varied in the model. The color-coding is the same as in the previous figures. The solid black circle is the trajectory of the parent body. The crosses correspond to the observing dates.