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Ursa Major Cluster

Coordinates: Sky map 11h 53m 48.9s, +52° 19′ 36″
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Not to be confused with Ursa Major Moving Group.

The Ursa Major Cluster (Ursa Major I Cluster, UMa I ClG) is a spiral-rich galaxy cluster of the Virgo Supercluster.

Some of its largest members are NGC 3631, NGC 3953, M109 on North (M109 Group) and NGC 3726, NGC 3938 NGC 4051 on South.

The Ursa Major cluster is located at a distance of 18.6 megaparsecs (60 million light years) and contains about 30% of the light but only 5% of the mass of the nearby Virgo cluster.

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