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Fig. 1

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Left and middle panels: PIONIER square visibilities and closure phase (dots) plotted together with the best-fit binary model (solid lines). The colors represent the four different pointings detailed in Table 1. The right-most panel shows the reduced χ2 of the model with respect to the position of the secondary. The red cross represents the astrometry of the best-fit model, while the open circle represents the prediction from the published orbit at the time of observation. The gray line indicates the trace of the orbit, the gray circle its periastron passage, and the gray dashed line shows the line of nodes.

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