Hilda group

Hilda group

(hil -dă) A group of asteroids that have orbits with semimajor axes of around 4.0 AU and orbital periods that are very close to the 3:2 resonance with that of Jupiter. The group takes its name from (153) Hilda, the largest member in it, which was discovered by the Austrian astronomer Johann Palisa in 1875. In common with the Trojan group, Hildas are thought to have more elongated shapes than the more normal main-belt asteroids.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

Hilda group

[′hil·də ‚grüp]
(astronomy)
A group of asteroids whose periods of revolution about the sun are approximately two-thirds that of Jupiter, and whose motions are in resonance with Jupiter.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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For instance, Jupiter's Himalia and few other irregulars orbiting the giant planet have colors and orbital characteristics similar to those of the Hilda group of asteroids, which lies in the outer part of the asteroid belt.