Time evolution of the orbital elements of Styx, with the mass m_S = 1.49 × 10¹⁵ kg, for the different dissipation values of A. The top panel shows Styx’s semi-major axis, the middle panel shows the eccentricity, and the bottom panel shows n_C ∕n. The continuous horizontal line in the top panel indicates Styx’s current position, at a∕R_p = 35.7, while the dashed lines in the bottom panel identify the 3/1, 4/1, and 5/1 MMRs.