Abell 2124 - Galaxy Cluster
The galaxy cluster Abell 2124 is a little more than 900 million light years away and can be found in the northern part of the constellation "CrB".
It is not quite certain, but it is possible that AGC 2124 also belongs to the "Corona Borealis Supercluster". The reason for the uncertainty is, that
the galaxy cluster is located nearly 10° away from the gravitational center. This corresponds to a true distance of 160 million light years, which
would be a lot.
The brightest galaxy (BGC) in Abell 2124 has the catalog designation "UGC 10012". With an apparent magnitude of 45" (arcseconds) it has a
true diameter of 200,000 lightyears, which puts it in the category "Giant Ellipse".
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Just south of Abell 2124 two 10mag bright stars can be found, which can serve as orientation. But apart from that the field of view is very poor in stars.
This makes it difficult to find the many single galaxies, because you have almost no anchor points and therefore have to estimate the position of
the galaxies over larger distances.
With a brightness of 14.5mag "UGC 10012" is of course the easiest to see and not difficult at all. It also seems to be the gravitational center of
the galaxy cluster. In the close vicinity there are some very faint galaxies, but unfortunately I could not see them. They were just too weak. But 18
other galaxies were visible. Especially nice (but also difficult) is a galaxy chain in the northern part (on top of the drawing). I didn't manage to see
all galaxies of this chain at the same time, but only 2-3 at once.
Despite the difficulties, Abell 2124 is one of the more interesting galaxy clusters of the "CrB Supercluster".
