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We analytically calculate the time series for the perturbations$\Delta\rho(t),~\Delta\dot\rho(t)$ induced by a general disturbing acceleration$\boldsymbol{A}$ on the mutual range $\rho$ and range-rate $\dot\rho$ of twotest particles $\textrm{A},~\textrm{B}$ orbiting the same spinning body. Weapply it to the general relativistic Lense-Thirring effect, due to theprimary's spin $\boldsymbol{S}$, and the classical perturbation arising fromits quadrupole mass moment $J_2$ for arbitrary orbital geometries andorientation of the source's symmetry axis $\boldsymbol{\hat{S}}$. TheEarth-Mercury range and range-rate are nominally affected by the Sun'sgravitomagnetic field to the $10~\textrm{m},~10^{-3}~\textrm{cm s}^{-1}$ level,respectively, during the extended phase (2026-2028) of the forthcomingBepiColombo mission to Mercury whose expected tracking accuracy is of the orderof $\simeq 0.1~\textrm{m},~2\times 10^{-4}~\textrm{cm s}^{-1}$. The competingsignatures due to the solar quadrupole $J_2^\odot$, if modelled at the$\sigma_{J_2^\odot}\simeq 10^{-9}$ level of the latest planetary ephemeridesINPOP17a, are nearly 10 times smaller than the relativistic gravitomagneticeffects. The position and velocity vectors $\mathbf{r},~\mathbf{v}$ of Mercuryand Earth are changed by the solar Lense-Thirring effect by about$10~\textrm{m},~1.5~\textrm{m}$ and $10^{-3}~\textrm{cms}^{-1},~10^{-5}~\textrm{cm s}^{-1}$, respectively, over 2 yr; neglecting suchshifts may have an impact on long-term integrations of the inner solar systemdynamics over $\sim\textrm{Gyr}$ timescales.

Analytically calculated post-Keplerian range and range-rate perturbations: the solar Lense-Thirring effect and BepiColombo