* DeltaV at perigee magnifies where your apogee ends up. Historically orbital slingshots generally make use of this effect. Technically an asteroid can passive

* DeltaV at perigee magnifies where your apogee ends up. Historically orbital slingshots generally make use of this effect. Technically an asteroid can passively get a boost from an orbital slingshot but probes do a burn because they get more bang from the same propelent.