Barycenter orbit of the primary based on the AUI only (dashed) with annual measured positions (circles), on the relative astrometry only (dash-pointed curve) with each epoch positions (asterisks), and on a full dataset (solid curve). A single NACO measurement (square), the barycenter (cross), the periastron (pentagon), and the photocenter orbit (inner ellipse) with relative astrometric positions (dots).