Fig. 4

The transfers capable of producing the present orbits of Halimede (left panel) and Nereid (right panel). Lower curve corresponds to the minimum impactor speed vim and an impactor mass mi = 1 m⊕. Intermediate curve corresponds to the maximum impactor speed viM and mi = 1 m⊕. Upper curve corresponds to vim and mi = 3.5 m⊕. The maximum current eccentricity emax is shown by a dotted line. For Halimede the upper curve and emax overlap. A (B) is the square of the ratio of the satellite’s speed just before (after) the impact on the escape velocity at the satellite’s location just before (after) the impact. e1m (e2m) is the minimum eccentricity of the orbits before (after) collision.
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