swing-around trajectory

swing-around trajectory

[′swiŋ ə¦rau̇nd trə′jek·trē]
(aerospace engineering)
A planetary round-trip trajectory which requires minimal propulsion at the destination planet, but instead uses the planet's gravitational field to effect the bulk of the necessary orbit change to return to earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.