2006 data for both GQ Lup and HIP 73357 also have much lower S/N than those in 2004 and 2005.

For the last seven NACO measurements, the mean in separation between GQ Lup A and its companion is $732.1 \pm 2.1$ mas and the mean PA is $275.98 \pm 0.25 ^{\circ}$, i.e., slightly north of west. This separation corresponds to $114 \pm 33$ AU at $156 \pm 50$ pc, the distance to GQ Lup A determined in Sect. 3.4.

Proper motion and orbital motion
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![image](sep_final_rev.ps){width="120mm"}

Given the proper motion of GQ Lup A (see Mugrauer & Neuhäuser 2005), we now have exceedingly high significance against the background hypothesis (that the faint object is a non-moving background object with negligible parallax; see Figs. 1 & 2 and Table 2). It is also very unlikely that both objects are independent members of the Lupus I cloud with similar proper motions (see Mugrauer & Neuhäuser 2005).

For final confirmation that they are bound, one could, e.g., try to measure the parallaxes of both objects with high precision (not yet feasible) or observe curvature in the orbital motion (possible after a few more decades).

For $\sim 114$ AU projected separation (see Sect. 3.4) 