Analytic Milky Way potentials reproduce N-body satellite orbits to within 5% for masses up to 10^8 Msun and radii above 30 kpc, but only within the first 1 to 2 Gyr.
A dwarf satellite galaxy in Sagittarius.Nature1994,370, 194–196
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Accuracy of analytic potentials for orbits of satellites around a Milky Way-like galaxy: comparison with $N$-body simulations
Analytic Milky Way potentials reproduce N-body satellite orbits to within 5% for masses up to 10^8 Msun and radii above 30 kpc, but only within the first 1 to 2 Gyr.