Geometric representation to scale of the binary system where V Hya A is represented as an orange filled circle and V Hya B as a black dot (to be visible, its radius was increased). V Hya A mass was set to 2 M_⊙, corresponding to a mass of 2.5 M_⊙ for V Hya B. Upper left panel: system depicted edge-on at the superior conjunction. The black line is oriented along the line of sight. The green cross indicates the centre of mass. Lower left panel: system viewed face-on, with the Roche equipotential in black line and the Roche lobe of the two stars in dashed gray. Right panel: system projected on the sky-plane at the superior conjunction for the counterclockwise solution, assuming a parallax of 2.31 mas. The black line is the best projected orbit, the dashed black line represents the line of nodes. The effect of the mass-ratio uncertainty on the orbital separation is illustrated by the colored ellipse.