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Elephant's Trunk nebula (view source)
Revision as of 11:55, August 13, 2018
, 11:55, August 13, 2018Created page with "{{Night Sky | image = | designation =vdB 142 | rightascension =21<sup>h</sup> 39<sup>m</sup><ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=IC+..."
{{Night Sky
| image =
| designation =vdB 142
| rightascension =21<sup>h</sup> 39<sup>m</sup><ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=IC+1396&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id IC 1396] from the [http://simbad.u-strasbg.fr/simbad SIMBAD Astronomical Database]. Using parameters of the star cluster.</ref>
| declination =+57° 29′ 24″<ref name=simbad/>
| distance =2,450 ly<ref name=ipac>[http://coolcosmos.ipac.caltech.edu/resources/paper_products/print_publication_pdf/ic1396.pdf The Elephant's Trunk nebula (PDF document)] from coolcosmos.ipac.caltech.edu</ref>
| constellation =Cepheus
| type =Emission nebula
| dimensions =
| magnitude =
| redshift =
| radvelocity =-15.35±3.41 km/s<ref name=simbad/>
| propmotion =RA: -2.30 mas/yr<ref name=simbad/><br/>Dec.: -3.81 mas/yr<ref name=simbad/>
| parallax =
}}
The '''Elephant's Trunk nebula''' (vdB 142, sometimes designated IC 1396A) is part of the [[emission nebula]] and [[star]] cluster that is IC 1396 complex.<ref name=apod>[https://apod.nasa.gov/apod/ap170119.html The Elephant's Trunk Nebula in Cepheus] from apod.nasa.gov</ref> The IC 1396 complex is itself a huge nebula covering around 5° of the night sky. Located in the [[constellation]] of [[Cepheus]], the nebula is a dense conglomeration of [[gas]] and dust that is being compressed the radiation and [[stellar wind]]s of nearby [[star]]s.<ref name=ipac/> These winds sculpt the nebula and are responsible for the circular rim (head) and long gas tail (trunk) of the nebula. The "trunk" which is around 20 [[light year]]s long.<ref name=apod/>
The [[Spitzer Space Telescope]] has imaged the IC 1396 complex in the [[infrared]] portion of the [[electromagnetic spectrum]].<ref name=spitzer>[http://www.spitzer.caltech.edu/images/1052-ssc2003-06a-Dark-Globule-in-IC-1396 Dark Globule in IC 1396] from spitzer.caltech.edu</ref> The obscuring effects of dust are not a problem in the infrared, meaning Spitzer has observed many otherwise invisible [[star]]s. A pair of stars (designated LkHa 349 and LkHa 349c) are responsible for the hole in the "head" of the nebula. LkHa 349c is much dimmer than LkHa 349 in visible light but they are of similar [[star magnitude|brightness]] in the infrared and so was observed by Spitzer. As they are both of similar brightness in the infrared, it is believed that LkHa 349c is surrounded by a large amount of dust.<ref name=ipac/>
==References==
{{reflist}}
{{Nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]
| image =
| designation =vdB 142
| rightascension =21<sup>h</sup> 39<sup>m</sup><ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=IC+1396&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id IC 1396] from the [http://simbad.u-strasbg.fr/simbad SIMBAD Astronomical Database]. Using parameters of the star cluster.</ref>
| declination =+57° 29′ 24″<ref name=simbad/>
| distance =2,450 ly<ref name=ipac>[http://coolcosmos.ipac.caltech.edu/resources/paper_products/print_publication_pdf/ic1396.pdf The Elephant's Trunk nebula (PDF document)] from coolcosmos.ipac.caltech.edu</ref>
| constellation =Cepheus
| type =Emission nebula
| dimensions =
| magnitude =
| redshift =
| radvelocity =-15.35±3.41 km/s<ref name=simbad/>
| propmotion =RA: -2.30 mas/yr<ref name=simbad/><br/>Dec.: -3.81 mas/yr<ref name=simbad/>
| parallax =
}}
The '''Elephant's Trunk nebula''' (vdB 142, sometimes designated IC 1396A) is part of the [[emission nebula]] and [[star]] cluster that is IC 1396 complex.<ref name=apod>[https://apod.nasa.gov/apod/ap170119.html The Elephant's Trunk Nebula in Cepheus] from apod.nasa.gov</ref> The IC 1396 complex is itself a huge nebula covering around 5° of the night sky. Located in the [[constellation]] of [[Cepheus]], the nebula is a dense conglomeration of [[gas]] and dust that is being compressed the radiation and [[stellar wind]]s of nearby [[star]]s.<ref name=ipac/> These winds sculpt the nebula and are responsible for the circular rim (head) and long gas tail (trunk) of the nebula. The "trunk" which is around 20 [[light year]]s long.<ref name=apod/>
The [[Spitzer Space Telescope]] has imaged the IC 1396 complex in the [[infrared]] portion of the [[electromagnetic spectrum]].<ref name=spitzer>[http://www.spitzer.caltech.edu/images/1052-ssc2003-06a-Dark-Globule-in-IC-1396 Dark Globule in IC 1396] from spitzer.caltech.edu</ref> The obscuring effects of dust are not a problem in the infrared, meaning Spitzer has observed many otherwise invisible [[star]]s. A pair of stars (designated LkHa 349 and LkHa 349c) are responsible for the hole in the "head" of the nebula. LkHa 349c is much dimmer than LkHa 349 in visible light but they are of similar [[star magnitude|brightness]] in the infrared and so was observed by Spitzer. As they are both of similar brightness in the infrared, it is believed that LkHa 349c is surrounded by a large amount of dust.<ref name=ipac/>
==References==
{{reflist}}
{{Nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]