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A deep-sky object (DSO) is any astronomical object that is not an individual star or Solar System object (such as Sun, Moon, planet, comet, etc.). [ 1 ] [ 2 ] The classification is used for the most part by amateur astronomers to denote visually observed faint naked eye and telescopic objects such as star clusters , nebulae and galaxies .
The Interstellarum Deep Sky Atlas (stylized as the interstellarum Deep Sky Atlas) is a 2014 sky atlas published by German astronomers Ronald Stoyan and Stephan Schurig. [1] The atlas has more than 2,000 deep-sky objects , including all deep-sky objects from the Abell , Hickson , Arp , Barnard, Palomar , Terzan, and Stock catalogues . [ 2 ]
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.
Some objects originally thought to be deep sky objects and listed in the NGC have been subsequently shown to be ordinary stars, so their inclusion in the catalog is now considered erroneous. [1] This list of stars is based on the "NGC 2000.0" version of the catalog, which lists the stars in its errata, [ 1 ] supplemented with data on each ...
Caldwell advocates, however, see the catalogue as a useful list of some of the brightest and best known non-Messier deep-sky objects. Thus, advocates dismiss any "controversy" as being fabricated by older amateurs simply not able or willing to memorize the new designations despite every telescope database using the Caldwell IDs as the primary ...
The Messier catalogue comprises nearly all of the most spectacular examples of the five types of deep-sky object – diffuse nebulae, planetary nebulae, open clusters, globular clusters, and galaxies – visible from European latitudes. Furthermore, almost all of the Messier objects are among the closest to Earth in their respective classes ...
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Webb's First Deep Field was taken by the telescope's Near-Infrared Camera (NIRCam) and is a composite produced from images at different wavelengths, totalling 12.5 hours of exposure time. [3] [4] SMACS 0723 is a galaxy cluster visible from Earth's Southern Hemisphere, [5] and has often been examined by Hubble and other telescopes in search of ...