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NGC 1 and NGC 2 as an optical double. NGC 2 is located about 345 million light-years from the Solar System, with a magnitude of +14.2, while the distance to NGC 1 is 210 million light-years. Although visually close in the sky, NGC 1 and NGC 2 are at very different distances; were they stars, they would be referred to as an "optical double" as ...
The set of double stars includes both optical double stars (aka optical doubles) and true binary stars (aka "physical double stars"). This subcategory page is only for listing optical double stars. Physical double stars should go in the subcategory Binary stars. If a double star is known to have an optical component, or if it is not known to be ...
NGC 3862 is an elliptical galaxy located 300 million light-years away [2] in the constellation Leo. [3] Discovered by astronomer William Herschel on April 27, 1785, [4] NGC 3862 is an outlying member of the Leo Cluster. [5] The galaxy is classified as a FR I radio galaxy [6] and as a Head-tail radio galaxy.
NGC 1 and NGC 2 as an optical double. At an estimated 140,000 light-years in diameter, [4] NGC 1 is roughly the same size as our galaxy, the Milky Way, which is believed to be approximately 160,000 light-years across. [6]
[2] NGC 3977 with NGC 3972. NGC 3977 along with NGC 3972 are listed together as Holm 304 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937. [3] This grouping is purely optical, as NGC 3977 is about four times farther away than NGC 3972. [4]
NGC 2000.0 (also known as the Complete New General Catalog and Index Catalog of Nebulae and Star Clusters) is a 1988 compilation of the NGC and IC made by Roger W. Sinnott, using the J2000.0 coordinates. [17] [18] It incorporates several corrections and errata made by astronomers over the years. [5]
The origin and properties (masses and spins) of a double neutron star system like GW170817 are the result of a long sequence of complex binary star interactions. [41] The gravitational wave signal indicated that it was produced by the collision of two neutron stars [9] [18] [20] [42] with a total mass of 2.82 +0.47 −0.09 solar masses (M ☉). [2]
The Double Cluster in Perseus (lower left of center, wide angle view) Greek astronomer Hipparchus cataloged the object (a patch of light in Perseus) as early as 130 BCE. To Bedouin Arabs the cluster marked the tail of the smaller of two fish they visualized in this area, and it was shown on illustrations in Abd al-Rahman al-Sufi's Book of Fixed Stars. [4]