The configuration of Fraternite–Egalite2–Egalite1 in the Neptune ring arcs system

By considering the finite mass of Fraternite, although small, it is shown that there are two time-averaged stationary points in its neighborhood due to the reaction of the test body to the fields of Neptune, Galatea, and Fraternite. These two locations measuring 11 . 7 ∘ and 13 . 8 ∘ from the center of Fraternite could correspond to the locations of Egalite 2 and Egalite 1. This model accounts for the 10 ∘ span of Fraternite and estimates its mass at m f = 6.4 × 10 16 kg . The eccentricities of Egalite 2 and Egalite 1 are believed to be about e = 5 × 10 - 4 .