Coma cluster

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Coma cluster

A very rich cluster of galaxies, near the north galactic pole, in the constellation Coma Berenices that contains at least 1000 bright elliptical and S0 galaxies. It is about 6 megaparsecs in diameter and is in the form of two equal subclumps, each with a central dominant galaxy associated with a radio source: an elliptical, NGC 4889, and an S0 galaxy, NGC 4874. The cluster is about 90 megaparsecs distant and is moving away from Earth at approximately 6700 km s–1.

Coma cluster

[′kō·mə ‚kləs·tər]
(astronomy)
A group of over 1000 bright galaxies having a recession velocity of about 4300 miles (6900 kilometers) per second.
An open cluster of about 100 stars at a distance of about 80 parsecs (1.5 × c1015 miles or 2.5 × 1015 kilometers).
References in periodicals archive ?
Richer and denser than the Virgo Cluster and containing thousands of galaxies, the Coma Cluster (Abell 1656) is a telescopic wonderland that takes its name from its parent constellation, Coma Berenices.
The core of the Coma Cluster (Abell 1656) harbors two massive ellipticals--NCC 4874 and NCC 4889--supergiant galaxies that have long dominated the cluster's evolution.
William was now on the verge of sweeping through the heart of the Coma Cluster of galaxies, Abell 1656. Skimming the northeast outskirts of the cluster the previous month, he had discovered NGC 4952 and NGC 4966 on March 13th.
The face-on barred spiral galaxy NCC 4921 in Abell 1656 displays a bright core surrounded by a large low surface brightness halo.
At a distance of about 350 million light-years, the Coma Galaxy Cluster (Abell 1656) is the nearest of the massive spherical galaxy clusters, with thousands of member galaxies.
There, the appearance of Abell 1656 in a 13-inch reflector is described in Coe's informal, nontechnical manner.
Many large-telescope users are familiar with the rich northern clusters Abell 426 in Perseus, Abell 1367 in Leo, and Abell 1656 in Coma Berenices (which can be found at, respectively, right ascension 3h 20m, declination +41.5[degree sign]; 11h 44m, +20.0[degree sign]; and 13h 00m, +28.0[degree sign]).