page_title: Atlas of Peculiar Galaxies
section_title: Galaxies with irregular clumps
hierarchical_section_title: Atlas of Peculiar Galaxies / List of galaxies in the catalog / Amorphous galaxies / Galaxies with irregular clumps
caption_attribution_description: Holmberg II / UGC 4305
context_page_description: The Atlas of Peculiar Galaxies is a catalog of peculiar galaxies produced by Halton Arp in 1966. A total of 338 galaxies are presented in the atlas, which was originally published in 1966 by the California Institute of Technology. The primary goal of the catalog was to present photographs of examples of the different kinds of peculiar structures found among galaxies.
context_section_description: These are objects that appear to be a series of irregular clumps with no coherent structure. Many of these objects are simply nearby dwarf galaxies. Some of these objects are interacting galaxies, while others are small groups of galaxies. In both cases, many of the constituent galaxies are irregular galaxies. The superposition of two or more such irregular galaxies can easily look like a single larger irregular galaxy, which is why the Atlas of Peculiar Galaxies (and other catalogs) often classify these pairs and groups as single objects.
caption: Holmberg II/UGC 4305, dwarf galaxy (Arp 268)
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