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Fig. 1.


Left panel: orbit of the SB-T system projected in the plane of the sky. Right panel: orbit of the SB-T system in a plane orthogonal to the plane of the sky, formed by the observer’s line-of-sight and north. The orbital solution was obtained from Le Bouquin et al. (2017) and the mean orbital parameters are labeled on the image. The phases of the T at the two VLBI epochs reported in this work are shown with orange and green dots in the orbital solution. The black arrow shows the projected clock-wise motion of the T. The periastron and apastron are also displayed in the panels. The portion of the orbit in which the T is in front of the SB, in our line-of-sight, is displayed in blue, while the portion of the orbit in which the T is behind the SB is labeled in red.

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