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Created page with "{{Night Sky | image = | designation =NGC 7000<br/>Cadwell 20 | rightascension =20<sup>h</sup> 58<sup>m</sup> 48<sup>s</sup><ref name=seds>[http://www.messie..."
{{Night Sky
| image =
| designation =[[NGC]] 7000<br/>Cadwell 20
| rightascension =20<sup>h</sup> 58<sup>m</sup> 48<sup>s</sup><ref name=seds>[http://www.messier.seds.org/xtra/ngc/n7000.html NGC 7000] from messier.seds.org</ref>
| declination =+44° 20′<ref name=seds/>
| distance =1,600 ly<ref name=seds/>
| constellation =Cygnus
| type =Emission nebula
| dimensions =120' x 100'<ref name=freestarcharts>[https://freestarcharts.com/ngc-7000 NGC 7000 - The North American Nebula] from freestarcharts.com</ref>
| magnitude =Apparent Mag: +4.5-12<ref name=freestarcharts/>
| redshift =
| radvelocity =
| propmotion =
| parallax =
}}
The '''North America nebula''' (NGC 7000, Cadwell 20) is an [[emission nebula]] in the [[constellation]] of [[Cygnus]], the swan.<ref name=apod>[https://apod.nasa.gov/apod/ap081028.html The North America Nebula] from apod.nasa.gov</ref> The nebula's name derives from its resemblance to the [[North America|North American continent]]. [[John Herschel]] discovered the nebula, cataloguing it as h 2096 and as GC 4621 in the General Catalogue, at some point before 1833.<ref name=seds/> It may have been observed earlier by his father, [[William Herschel]], as he recorded a large faint nebula in the same region. It was first photographed by Max Wolf on December 12, 1890. The nebula can be observed using [[binoculars]] to be around 3 degrees east of the bright [[star]] [[Deneb]] (Alpha Cygni).<ref name=freestarcharts/> It can be seen with the naked-eye but a small amount of [[light Pollution|light pollution]] renders the nebula invisible.
==Properties and Structure==
Located 1,600 [[light year]]s away, the nebula is around 50-56 light years across.<ref name=apod/><ref name=seds/> The brightness of the nebula varies drastically across the nebula, with the brightest regions having an [[star magnitude|apparent magnitude]] of +4.5 while the dimmest areas have an apparent magnitude of +12.<ref name=freestarcharts/> The nebula overall however is generally very faint and has a low surface brightness. The brightest areas of the nebula that resembles [[Central America]] and [[Mexico]] is composed [[dust]], hot [[gas]] and [[star]]s, a region known as the Cygnus Wall.
The nebula is likely associated with three nearby [[open star cluster]]s. NGC 6989, discovered by [[William Herschel]] in 1790, is located in the North-West region of the nebula.<ref name=seds/> Near NGC 6989 is NGC 6996, discovered by [[John Herschel]] in 1833. NGC 6997, discovered by [[William Herschel]] in 1786, is situated on the western side of the nebula.
In [[infrared]] images of the nebula taken by the [[Spitzer Space Telescope]], over 2,000 [[star]]s have been detected within the nebula.<ref>[https://www.nasa.gov/mission_pages/spitzer/news/spitzer20110210.html New View of Family Life in the North American Nebula] from nasa.ogv</ref> These stars are not visible in normal images because of the dust in the nebula. A large group of stars are thought to be affecting the nebula but it is unknown as to where they are located.
==References==
{{reflist}}
{{nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]
| image =
| designation =[[NGC]] 7000<br/>Cadwell 20
| rightascension =20<sup>h</sup> 58<sup>m</sup> 48<sup>s</sup><ref name=seds>[http://www.messier.seds.org/xtra/ngc/n7000.html NGC 7000] from messier.seds.org</ref>
| declination =+44° 20′<ref name=seds/>
| distance =1,600 ly<ref name=seds/>
| constellation =Cygnus
| type =Emission nebula
| dimensions =120' x 100'<ref name=freestarcharts>[https://freestarcharts.com/ngc-7000 NGC 7000 - The North American Nebula] from freestarcharts.com</ref>
| magnitude =Apparent Mag: +4.5-12<ref name=freestarcharts/>
| redshift =
| radvelocity =
| propmotion =
| parallax =
}}
The '''North America nebula''' (NGC 7000, Cadwell 20) is an [[emission nebula]] in the [[constellation]] of [[Cygnus]], the swan.<ref name=apod>[https://apod.nasa.gov/apod/ap081028.html The North America Nebula] from apod.nasa.gov</ref> The nebula's name derives from its resemblance to the [[North America|North American continent]]. [[John Herschel]] discovered the nebula, cataloguing it as h 2096 and as GC 4621 in the General Catalogue, at some point before 1833.<ref name=seds/> It may have been observed earlier by his father, [[William Herschel]], as he recorded a large faint nebula in the same region. It was first photographed by Max Wolf on December 12, 1890. The nebula can be observed using [[binoculars]] to be around 3 degrees east of the bright [[star]] [[Deneb]] (Alpha Cygni).<ref name=freestarcharts/> It can be seen with the naked-eye but a small amount of [[light Pollution|light pollution]] renders the nebula invisible.
==Properties and Structure==
Located 1,600 [[light year]]s away, the nebula is around 50-56 light years across.<ref name=apod/><ref name=seds/> The brightness of the nebula varies drastically across the nebula, with the brightest regions having an [[star magnitude|apparent magnitude]] of +4.5 while the dimmest areas have an apparent magnitude of +12.<ref name=freestarcharts/> The nebula overall however is generally very faint and has a low surface brightness. The brightest areas of the nebula that resembles [[Central America]] and [[Mexico]] is composed [[dust]], hot [[gas]] and [[star]]s, a region known as the Cygnus Wall.
The nebula is likely associated with three nearby [[open star cluster]]s. NGC 6989, discovered by [[William Herschel]] in 1790, is located in the North-West region of the nebula.<ref name=seds/> Near NGC 6989 is NGC 6996, discovered by [[John Herschel]] in 1833. NGC 6997, discovered by [[William Herschel]] in 1786, is situated on the western side of the nebula.
In [[infrared]] images of the nebula taken by the [[Spitzer Space Telescope]], over 2,000 [[star]]s have been detected within the nebula.<ref>[https://www.nasa.gov/mission_pages/spitzer/news/spitzer20110210.html New View of Family Life in the North American Nebula] from nasa.ogv</ref> These stars are not visible in normal images because of the dust in the nebula. A large group of stars are thought to be affecting the nebula but it is unknown as to where they are located.
==References==
{{reflist}}
{{nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]