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Fig. 4

image

Angular separation ρ (left) and position angle θ (right) of α Cen B relative to α Cen A. Our new astrometric measurements are shown as red dots, and the literature values from the WDS are shown as gray dots. The predictions from our best-fit orbit (Table 1) are represented with solid blue curves. The residuals compared to our best-fit orbit are shown in the bottom panels, together with the differences between the orbit determined by Pourbaix & Boffin (2016) and our best-fit orbit (dashed gray lines, for comparison). The time scale runs from 1st January 2000 to 31 December 2031, and the magenta vertical markers indicate the epochs of the conjunctions of S1 to S6.

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