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Fig. 1
Encounter geometry for an impactor orbit with ap = 2.0 AU and qp = 0.2−1.0 AU. Where the Earth orbit (blue dashed circle) intersects the impactor orbit (black solid ellipse), the angle between v⊕ (blue dashed arrow) and vp (black solid arrow) decreases as qp increases, and thus venc (red solid arrow) shrinks.
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