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New General Catalogue (view source)
Revision as of 13:56, December 28, 2017
, 13:56, December 28, 2017Created page with "The '''New General Catalogue of Nebulae and Stars''' is a large catalogue of deep sky astronomical objects based on the General Catalogue of Nebulae and Stars created by Wil..."
The '''New General Catalogue of Nebulae and Stars''' is a large catalogue of deep sky astronomical objects based on the General Catalogue of Nebulae and Stars created by [[William Herschel]].<ref name=freestarcharts>[https://freestarcharts.com/ngc-ic NGC/IC Catalogues] from freestarcharts.com</ref> Produced by John Louis Emil Dreyer in 1888, the New General Catalogue is an extension of the catalogue made by Herschel containing several thousand objects, including [[galaxies]], [[nebulae]] and [[open cluster]]s among others. Later, Dreyer published two supplementary catalogues, the Index Catalogues. There are some mistakes in the New General Catalogue, mainly position and description errors and others have tried to correct them. The most recent was the Revised New General Catalogue and Index Catalogue performed by Wolfgang Steinicke in 1996.<ref name=freestarcharts/>
The NGC catalogue is still widely used by [[astronomer]]s today. Objects in the New General Catalogue are identified by the letters "NGC" followed by a number.
==History==
The NGC catalogue was first published in 1888 and contains some 7,840 objects.<ref name=NGCIC_Mission>[http://ngcicproject.org/mission.htm NGC/IC Mission] from ngcicproject.org</ref><ref name=freestarcharts/> This was an attempt by Dreyer to collate all the known objects, such as [[nebulae]] and [[globular cluster]]s, into a single catalogue. Previously, there had been many catalogues, including some famous ones such as the [[Messier catalogue]], but these were becoming outdated as more powerful telescopes allowed for the observation of fainter deep sky objects. As an example, Messier's catalogue from 1771 contains around 100 objects whilst [[John Herschel]]'s General Catalogue created in 1864 contains some 5,079 objects.<ref>[http://www.messier.seds.org/xtra/history/m-cat.html Charles Messier's Catalog of Nebulae and Star Clusters] from messier.seds.org</ref><ref name=freestarcharts/> Later catalogues did not also include all previously known objects. Herschel specifically tried to avoid including entries in the Messier Catalogue in his.<ref name=seds>[http://www.messier.seds.org/xtra/similar/herschel.html William Herschel's catalog of Deep Sky objects] from messier.seds.org</ref> Dreyer used any source of data he could find. As this meant data was collected by numerous people, using numerous different instruments, various observation conditions, this lead to various errors in the NGC catalogue. Some entries are repeated and others point to blank patches of sky.
After publishing the New General catalogue, Dreyer published the Index catalogues, the first in 1895 and the second in 1908. Denoted as IC I and IC II, these added a further 1,520 and 3,866 objects.<ref name=freestarcharts/>
==References==
{{reflist}}
==See also==
*[[Messier catalogue]]
*[http://spider.seds.org/ngc/ngc.html Interactive NGC Catalogue Online]
[[Category:Astronomy]]
The NGC catalogue is still widely used by [[astronomer]]s today. Objects in the New General Catalogue are identified by the letters "NGC" followed by a number.
==History==
The NGC catalogue was first published in 1888 and contains some 7,840 objects.<ref name=NGCIC_Mission>[http://ngcicproject.org/mission.htm NGC/IC Mission] from ngcicproject.org</ref><ref name=freestarcharts/> This was an attempt by Dreyer to collate all the known objects, such as [[nebulae]] and [[globular cluster]]s, into a single catalogue. Previously, there had been many catalogues, including some famous ones such as the [[Messier catalogue]], but these were becoming outdated as more powerful telescopes allowed for the observation of fainter deep sky objects. As an example, Messier's catalogue from 1771 contains around 100 objects whilst [[John Herschel]]'s General Catalogue created in 1864 contains some 5,079 objects.<ref>[http://www.messier.seds.org/xtra/history/m-cat.html Charles Messier's Catalog of Nebulae and Star Clusters] from messier.seds.org</ref><ref name=freestarcharts/> Later catalogues did not also include all previously known objects. Herschel specifically tried to avoid including entries in the Messier Catalogue in his.<ref name=seds>[http://www.messier.seds.org/xtra/similar/herschel.html William Herschel's catalog of Deep Sky objects] from messier.seds.org</ref> Dreyer used any source of data he could find. As this meant data was collected by numerous people, using numerous different instruments, various observation conditions, this lead to various errors in the NGC catalogue. Some entries are repeated and others point to blank patches of sky.
After publishing the New General catalogue, Dreyer published the Index catalogues, the first in 1895 and the second in 1908. Denoted as IC I and IC II, these added a further 1,520 and 3,866 objects.<ref name=freestarcharts/>
==References==
{{reflist}}
==See also==
*[[Messier catalogue]]
*[http://spider.seds.org/ngc/ngc.html Interactive NGC Catalogue Online]
[[Category:Astronomy]]