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The number of galaxies belonging to the cluster, out to (at least) the virial radius. parent The parent structure (e.g. parent galaxy cluster, parent supercluster...) richness Abell (or related) richness class. Based on number of members within a magnitude range of m 3 to m 3 +2, where m 3 is the magnitude of the third brightest member of the ...
The New General Catalogue of Nebulae and Clusters of Stars (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies , star clusters and emission nebulae .
The astronomical catalogue is composed mainly of star clusters, nebulae, and galaxies. Other objects in the catalogue can be found in the other subpages of the list of NGC objects . The constellation information in these tables is from The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer , [ 1 ...
NGC 288 is a globular cluster in the constellation Sculptor.Its visual appearance was described by John Dreyer in 1888. [7] It is located about 1.8° southeast of the galaxy NGC 253, 37′ north-northeast of the South Galactic Pole, 15′ south-southeast of a 9th magnitude star, and encompassed by a half-circular chain of stars that opens on its southwest side. [1]
Abell 2029 or A2029 is a large and relaxed cluster of galaxies 315 megaparsecs (1.027 billion light-years) away in the constellation Virgo. [5] A2029 is a Bautz–Morgan classification type I cluster due to its large central galaxy, IC 1101. Abell 2029 has a diameter of 5.8–8 million light-years.
It has one of the highest concentrations known for Galactic globular clusters. [3] The stellar components show two separate populations of subgiant stars, with the brighter branch being more concentrated in the outer regions of the cluster. [10] NGC 1851 is an estimated 9.2 [6] billion years old with 551,000 times the mass of the Sun. [5]
NGC 225 is an open cluster in the constellation Cassiopeia. It is located roughly 2,200 light-years from Earth. It is about 100 to 150 million years old. [2] The binary fraction, or the fraction of stars that are multiple stars, is 0.52. [2]