Relative orbit of the secondary component of V923 Sco and its best fit assuming spectroscopic elements (P,e, ω, T₀) (top). The nodal line is plotted by dash dots. Character “A” shows the position of the ascending node. Close-up view of error ellipses (dot-dashed line) at 9 epochs are shown at bottom. The orbit is prograde (counterclockwise motion on the sky). North is up and east is left on both panels.