We present the analytical post-Newtonian solutions for the test particle’s motion in the Reissner–Nordström spacetime. The solutions are formulated in the Wagoner–Will representation, the Epstein–Haugan representation, the Brumberg representation, and the Damour–Deruelle representation, respectively. The relations between the (post-)Keplerian parameters in different representations, as well as their relations to the orbital energy and angular momentum are also provided. © 2019, Springe...