Outer Planet Missions with Electric Propulsion Systems—Part I

Figure 6

Ratio $m_f/m_i$ (continuous lines) and $\mathrm{\Delta }V$ (dashed lines), considering NEP for a mission to Neptune, with effective specific power $(P)=40$ W/kg, TOF = 10 years, $V_{\inf \hspace{0.17em}}=6$ km/s.