As you might guess, the Coma galaxy cluster resides within the boundaries of the constellation Coma Berenices. If you have access to a large amateur telescope, you can search for it 2.7° due west of magnitude 4.2 Beta (β) Comae Berenices.
The Coma Cluster is huge, with over 1,000 galaxies within a 4°-wide field. The richest area, however, is the central 0.5°, a region that covers as much sky as the Full Moon.
This cluster’s designation is Abell 1656, taken from American