Combination of 20, 3 minute exposures unfiltered.
SBIG STL-1001E CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.
The Corona Borealis superculster is probably the best known of its type in the northern hemisphere. Located at a distance of around 1 billion lightyears, the supercluster contains the galaxy clusters Abell 2056, Abell 2061, Abell 2065, Abell 2067, Abell 2079, Abell 2089, and Abell 2092. Of these, Abell 2056, 2061, 2065, 2067 and A2089 are gravitationally bound and in the process of collapsing to form a massive cluster. There are in excess of 400 galaxies in the supercluster. Abell 2065 is the most massive galaxy cluster within the supercluster, and lies at the centre of the above image.
PCG 54883 is the brightest galaxy in the image. At magnitude 15.9 this should be visible in larger telescopes from a dark location. With a 20" telescope several of the brighter galaxies should be visible.