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Published online by Cambridge University Press: 12 April 2016
The word “group” is so general that I would like to suggest that here it is used in its most general way: a group of asteroids is a collection of minor planets that have some feature in common. If we agree on this use of the word “group,” then we can discern the following asteroidal groups:
(1) Groups that have a dynamical cause:
(a) Trojans
(b) Commensurability groups:
(i) Hungaria group
(ii) Hilda group
(iii) Thule
(2) Groups that probably have no dynamical cause:
(a) Hirayama families
(b) Brouwer groups
(c) Jetstreams