All orbits are true Keplerian ellipses from TLE elements. Burns at perigee/apogee. 6 thrust vectors per node.

── PHYSICS MODEL STATUS ── SGP4 propagation Full 6-element Kepler Eccentric orbits Perigee/apogee burns Plane change ΔV Vis-viva velocities J2–J6 zonal harmonics F10.7+Ap drag (NOAA live) Lunar/solar 3-body grav Solar radiation pressure Eclipse/shadow model Lambert solver (Izzo) Porkchop ΔV optimizer RK4/5 adaptive integrator Finite burn arcs Tsiolkovsky propellant NRLMSISE-00 atm model Lunar/solar ephemeris DE440 Multi-leg optimization