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DesignationsUrsa Major Cluster, Ursa Major I Cluster, UMa I ClG
DivisionsSubdivided into a North Group (also called the M109 Group) and a South Group
ConstellationUrsa Major
Right AscensionCentred around 11h 53m 49s
DeclinationCentred around +52° 19' 36"
Distancec.60,700,000 light years
c.18,600,000 parsecs
DimensionsApparent: c. 16° x 5°
Actual: c. 16,800,000 x 5,700,000 light years
MembersAbout sixty major galaxies, including M109, NGC 3556, NGC 3675, NGC 3718, NGC 3953, NGC 4157
Optimum VisibilityMarch / April (Usually visible from northern latitudes)
NotesA component cluster of the Virgo Supercluster, with a high population of spiral and barred spiral galaxies. Not to be confused with the Ursa Major Moving Cluster (or Moving Group), a collection of stars within the Milky Way Galaxy in the same general part of the sky.

NGC 4051 is one of the more massive galaxies that make up the Ursa Major Cluster. It belongs to the Ursa Major South Group, one of two subgroups that make up the full Cluster, that straddles the border between Ursa Major and Canes Venatici. Imagery provided by Aladin sky atlas


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