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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 ...
These fields provide radial velocity values for the galaxy as a whole. The dimensionless quantity z is the redshift parameter and is used when the value is very small, such as less than 0.1. The h_radial_v gives the heliocentric radial velocity of the galaxy in units of km/s.
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 ...
The following is a list of NGC objects, that is objects listed in the New General Catalogue (NGC). It is one of the largest comprehensive astronomical catalogues for deep sky objects such as star clusters, nebulae, and galaxies. List of NGC objects (1–1000) List of NGC objects (1001–2000) List of NGC objects (2001–3000)
Abell 1689 is one of the biggest and most massive galaxy clusters known and acts as a gravitational lens, distorting the images of galaxies that lie behind it. [4] It has the largest system of gravitational arcs ever found. [5] Abell 1689 shows over 160,000 globular clusters, the largest population ever found. [6]
The cluster lies around 13,000 light-years distant and is one of the closer globular clusters to Earth. It also lies 17,000 light-years away from the galactic centre. [ 8 ] It belongs to Shapley–Sawyer Concentration Class VI, namely of intermediate density, [ 1 ] and has been calculated to be 11.78 billion years old. [ 6 ]
Map showing the location of NGC 6067. NGC 6067 is an open cluster in the constellation Norma. It is located to the north of Kappa Normae, with an angular diameter of 12 ′. Visible to the naked eye in dark skies, [4] [5] it is best observed with binoculars or a small telescope, and a 12-inch aperture telescope will reveal about 250 stars.