The Ursa Major Cluster (Ursa Major I Cluster, UMa I ClG) is a spiral-rich
galaxy cluster
A galaxy cluster, or a cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity, with typical masses ranging from 1014 to 1015 solar masses. They are the second-lar ...
of the
Virgo Supercluster
The Virgo Supercluster (Virgo SC) or the Local Supercluster (LSC or LS) is a mass concentration of galaxies containing the Virgo Cluster and Local Group, which itself contains the Milky Way and Andromeda galaxies, as well as others. At least ...
.
Some of its largest members are
NGC 3631,
NGC 3953,
M109 on North (
M109 Group
The M109 Group (also known as the NGC 3992 Group or Ursa Major cloud) is a group of galaxies
A galaxy group or group of galaxies (GrG) is an aggregation of galaxies comprising about 50 or fewer gravitationally bound members, each at least as ...
) and
NGC 3726,
NGC 3938,
NGC 4051 on South.
The Ursa Major cluster is located at a distance of 18.6 mega
parsec
The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to or (au), i.e. . The parsec unit is obtained by the use of parallax and trigonometry, an ...
s (60 million
light-years) and contains about 30% of the light emitted but only 5% of the mass of the nearby
Virgo Cluster
The Virgo Cluster is a large cluster of galaxies whose center is 53.8 ± 0.3 Mly (16.5 ± 0.1 Mpc) away in the constellation Virgo. Comprising approximately 1,300 (and possibly up to 2,000) member galaxies, the cluster forms the heart of the la ...
.
External links
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Galaxy clusters
Virgo Supercluster
Ursa Major (constellation)
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