SkipCaptcha
1,279
edits
Changes
Jump to navigation
Jump to search
Created page with "{{Night Sky | image = | designation =NGC 7009<br/>Cadwell 55 | rightascension =21<sup>h</sup> 04<sup>m</sup> 10.877<sup>s</sup><ref name=constellation-guide..."
{{Night Sky
| image =
| designation =[[NGC]] 7009<br/>Cadwell 55
| rightascension =21<sup>h</sup> 04<sup>m</sup> 10.877<sup>s</sup><ref name=constellation-guide>[http://www.constellation-guide.com/saturn-nebula/ Saturn nebula] from constellation-guide.com</ref>
| declination =-11° 21′ 48.25″<ref name=constellation-guide/>
| distance =2,000-4,000 ly<ref name=constellation-guide/>
| constellation =Aquarius
| type =Planetary nebula
| dimensions =41"x35"<ref name=constellation-guide/>
| magnitude =Apparent Mag: +8.0<ref name=constellation-guide/><br/>Absolute Mag: +2.5-1.0<ref name=constellation-guide/>
| redshift =-0.000155±0.000003<ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+7009&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id NGC 7009] from simbad.u-strasbg.fr</ref>
| radvelocity =-46.6±0.9 km/s<ref name=simbad/>
| propmotion =
| parallax =
}}
The '''Saturn nebula''' (NGC 1009) is a [[planetary nebula]] in the [[constellation]] of [[Aquarius]].<ref name=constellation-guide/> The nebula was named by Lord Rosse due to its similarities to the planet [[Saturn]], when its rings are seen nearly edge on. Its appearance is very similar to another planetary nebula, the [[Cat's eye nebula]]. The nebula is best observed in later summer, in the months of July, August and September.<ref name=freestarcharts>[https://freestarcharts.com/ngc-7009 NGC 7009 - The Saturn Nebula] from freestarcharts.com</ref>
==History==
The nebula was first observed by [[William Herschel]] on September 7, 1782.<ref name=constellation-guide/> One of the first nebulae Herschel discovered, he was the first to refer to the Saturn nebula and others like it as [[planetary nebula]]e. However it was Lord Rosse in 1840 who first called it the Saturn nebula.<ref>[https://oneminuteastronomer.com/6881/saturn-nebula/ The Saturn nebula] from oneminuteastronomer.com</ref>
==Properties and Structure==
The nebula's apparent size of 41x35 arc seconds corresponds to a physical radius of 0.2-0.4 [[light year]]s.<ref name=constellation-guide/> There is large uncertainty in the distance to the nebula, many estimates put it at 2,000-4,000 light years but the most recent suggests it is closer to 5,000 light years. The nebula is approaching us at around 45 km/s.
A recent study by the MUSE (Multi Unit Spectroscopic Explorer) instrument on the Very Large Telescope has been used to observe the nebula.<ref name=eso>[http://www.eso.org/public/unitedkingdom/news/eso1731/ The Strange Structures of the Saturn Nebula]from eso.org</ref> The highly detailed optical maps of gas and dust produce have revealed that the nebula has a complex structure, consisting of various jets of gas, several shells, knots, filaments, ansae and a halo surrounding the nebula.<ref name=constellation-guide/> The ansae are the two large handles of low [[density]] gas that project out from the disk and are notably impressive in this nebula. These have been observed in other nebulae such as the [[Cat's eye nebula]] and the [[Ghost of Jupiter]].
Like most planetary nebulae, there is a [[star]] at the centre of the nebula. The star, a [[white dwarf]], has a temperature of 55,000 K and a [[star magnitude|magnitude]] of +11.5.<ref name=freestarcharts/> Its great distance for [[Earth]] means this corresponds to an absolute magnitude of +1.5, meaning it is about 20 brighter than the [[Sun]].<ref name=constellation-guide/>
==References==
{{reflist}}
{{Nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]
| image =
| designation =[[NGC]] 7009<br/>Cadwell 55
| rightascension =21<sup>h</sup> 04<sup>m</sup> 10.877<sup>s</sup><ref name=constellation-guide>[http://www.constellation-guide.com/saturn-nebula/ Saturn nebula] from constellation-guide.com</ref>
| declination =-11° 21′ 48.25″<ref name=constellation-guide/>
| distance =2,000-4,000 ly<ref name=constellation-guide/>
| constellation =Aquarius
| type =Planetary nebula
| dimensions =41"x35"<ref name=constellation-guide/>
| magnitude =Apparent Mag: +8.0<ref name=constellation-guide/><br/>Absolute Mag: +2.5-1.0<ref name=constellation-guide/>
| redshift =-0.000155±0.000003<ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+7009&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id NGC 7009] from simbad.u-strasbg.fr</ref>
| radvelocity =-46.6±0.9 km/s<ref name=simbad/>
| propmotion =
| parallax =
}}
The '''Saturn nebula''' (NGC 1009) is a [[planetary nebula]] in the [[constellation]] of [[Aquarius]].<ref name=constellation-guide/> The nebula was named by Lord Rosse due to its similarities to the planet [[Saturn]], when its rings are seen nearly edge on. Its appearance is very similar to another planetary nebula, the [[Cat's eye nebula]]. The nebula is best observed in later summer, in the months of July, August and September.<ref name=freestarcharts>[https://freestarcharts.com/ngc-7009 NGC 7009 - The Saturn Nebula] from freestarcharts.com</ref>
==History==
The nebula was first observed by [[William Herschel]] on September 7, 1782.<ref name=constellation-guide/> One of the first nebulae Herschel discovered, he was the first to refer to the Saturn nebula and others like it as [[planetary nebula]]e. However it was Lord Rosse in 1840 who first called it the Saturn nebula.<ref>[https://oneminuteastronomer.com/6881/saturn-nebula/ The Saturn nebula] from oneminuteastronomer.com</ref>
==Properties and Structure==
The nebula's apparent size of 41x35 arc seconds corresponds to a physical radius of 0.2-0.4 [[light year]]s.<ref name=constellation-guide/> There is large uncertainty in the distance to the nebula, many estimates put it at 2,000-4,000 light years but the most recent suggests it is closer to 5,000 light years. The nebula is approaching us at around 45 km/s.
A recent study by the MUSE (Multi Unit Spectroscopic Explorer) instrument on the Very Large Telescope has been used to observe the nebula.<ref name=eso>[http://www.eso.org/public/unitedkingdom/news/eso1731/ The Strange Structures of the Saturn Nebula]from eso.org</ref> The highly detailed optical maps of gas and dust produce have revealed that the nebula has a complex structure, consisting of various jets of gas, several shells, knots, filaments, ansae and a halo surrounding the nebula.<ref name=constellation-guide/> The ansae are the two large handles of low [[density]] gas that project out from the disk and are notably impressive in this nebula. These have been observed in other nebulae such as the [[Cat's eye nebula]] and the [[Ghost of Jupiter]].
Like most planetary nebulae, there is a [[star]] at the centre of the nebula. The star, a [[white dwarf]], has a temperature of 55,000 K and a [[star magnitude|magnitude]] of +11.5.<ref name=freestarcharts/> Its great distance for [[Earth]] means this corresponds to an absolute magnitude of +1.5, meaning it is about 20 brighter than the [[Sun]].<ref name=constellation-guide/>
==References==
{{reflist}}
{{Nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]