The |$\operatorname{Gal}(\overline{\textbf{k}}/\textbf{k})$|-orbits of |$(-1)$|-curves on the Petersen diagram of a del Pezzo surface of degree |$5$|⁠; where the curves in one |$\operatorname{Gal}(\overline{\textbf{k}}/\textbf{k})$|-orbit are indicated by the same color and where the ones that are defined over |$\textbf{k}$| are in particular represented in red.