Hi Mark, the galaxy clusters are mostly Abell groups, but there are others as well such as Shahbazian and maybe a Rose group or two.
Hi Mark, the galaxy clusters are mostly Abell groups, but there are others as well such as Shahbazian and maybe a Rose group or two.
Howard
30-inch f/2.7 alt-az Newtonian
https://sites.google.com/site/howardbanichhomepage/
https://sites.google.com/site/sprays...pemirrors/home
Contributing Editor, Sky & Telescope magazine
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