This compilation gives the membership of object to an association.
An assosiation is defined as a group or cluster of galaxies, or more generally
as a collection of objects associated through some of their attributes.
For example, this concept allows to link HII regions, or supernovae
to their host or parent galaxy: In this case, the association is the parent
galaxy and the members are the HI regions or the supernovae.
Some groups indexed in Leda do not have the list of their members stored in the group catalog.
The following table describes some of the group catalogues included in HyperLeda
The first ten sources of membership
Statistics of the compilation of membership