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{{Infobox nebula
| name = IC 5146
| type = reflection
| type2 = [[發射星雲]]
| ra = {{RA|21|53|28.7}}
| dec = {{DEC|+47|16|01}}
| dist_ly = 3300 ly
| appmag_v = +7.2
| size_v = 12′
| constellation = [[天鵝座]]
| radius_ly =
| notes =
| names = 繭星雲，[[科德韋爾深空天體表|Caldwell]] 19，[[Sharpless catalog|Sh 2-125]]
| image = CocoonHunterWilson.jpg
|caption=業餘者拍攝的f IC 5146 "繭星雲"影像。
}}
'''IC 5146'''（也稱為'''科德韋爾19'''，'''Sh 2-125'''，和'''繭星雲'''）是位於[[天鵝座]]的一個[[反射星雲|反射]]<ref name="yard">{{cite book|last=Eicher|first=David J.|title=The Universe from Your Backyard: A Guide to Deep-Sky Objects from Astronomy Magazine|publisher=AstroMedia (Kalmbach Publishing Company)|year=1988|isbn=0-521-36299-7}}</ref>/[[發射星雲|發射]]<ref name="dougs"/>[[星雲]]和[[科德韋爾深空天體表|科德韋爾天體]]。IC 5146特別是指星雲中的星團和Sh2-125<ref>{{cite web |url=http://galaxymap.org/cgi-bin/sharpless.py?s=125 |title=存档副本 |accessdate=2009-08-27 |deadurl=yes |archiveurl=https://web.archive.org/web/20110930102718/http://galaxymap.org/cgi-bin/sharpless.py?s=125 |archivedate=2011-09-30 }}</ref>，它的亮度是+10.0<ref name="atlas">{{cite book|last=Pasachoff|first=Jay M.|title=Stars and Planets|publisher=Peterson Field Guides|location=New York, NY|year=2000|pages=578 pg|chapter=Atlas of the Sky|isbn=0-395-93432-X|language=en}}</ref>/+9.3<ref name="dougs">{{cite web|url=http://www.dougsastro.net/astrophotos/deepsky/CocoonNebula.htm|title=IC 5146 - Cocoon Nebula|last=Sanqunetti|first=Doug|year=2007|publisher=dougsastro.net|accessdate=2008-08-06|deadurl=yes|archiveurl=https://web.archive.org/web/20080704070603/http://www.dougsastro.net/astrophotos/deepsky/CocoonNebula.htm|archivedate=2008-07-04}}</ref>/+7.2.<ref name="starry">{{cite web|url=http://www.starrywonders.com/cocoon.html|title=Cocoon Nebula|last=Cannistra|first=Steve|year=2004|publisher=starrywonders.com|accessdate=2008-08-06|archive-date=2013-11-07|archive-url=https://web.archive.org/web/20131107033822/http://www.starrywonders.com/cocoon.html|dead-url=yes}}</ref>。它的天體座標是赤經{{RA|21|53.5}}，赤緯{{DEC|+47|16}}，鄰近肉眼可以看見的[[天鵝座π]]、[[蝎虎座]]的疏散星團[[NGC 7209]]，和明亮的疏散星團[[M39 (疏散星團)|M39]]<ref name="yard"/><ref name="atlas"/>。這個星團距離大約4,000光年遠，中心的恆星大約是在10萬年前形成的<ref>{{cite web|url=http://apod.nasa.gov/apod/ap021014.html|title=APOD: 2002 October 14 - IC 5146: The Cocoon Nebula|last=Nemiroff|first=Robert|coauthors=Bonnell, Jerry|date=2002-10-14|publisher=APOD (NASA)|accessdate=2008-08-06|archive-date=2014-08-10|archive-url=https://web.archive.org/web/20140810135231/http://apod.nasa.gov/apod/ap021014.html|dead-url=yes}}</ref>；星雲的視直徑大約12弧分，實直徑相當於15光年<ref name="starry"/> 依觀看IC 5146的經驗，[[暗星雲]]巴納德168 (B168) 是一個不可分割的目標，它形成一條暗帶環繞著星團，並且投影在西方拖曳在繭星雲的後方。

== 參考資料 ==
{{reflist}}

== 外部連結 ==
* [https://web.archive.org/web/20040609051718/http://www.seds.org/~spider/ngc/ngc.cgi?ic+5146 SEDS – IC 5146]
* [http://simbad.u-strasbg.fr/sim-id.pl?Ident=IC%205146 Simbad – IC 5146]
* [http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=IC%205146 NED – IC 5146]{{Wayback|url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=IC%205146 |date=20191017103158 }}
* [https://web.archive.org/web/20090610215503/http://www.dsi-astronomie.de/IC5146.html IC5146 ]
* [https://web.archive.org/web/20110930102718/http://galaxymap.org/cgi-bin/sharpless.py?s=125 Sharpless Catalog 125]
* {{WikiSky}}

{{sky|21|53|32|+|47|16|06|4000}}

{{sh2 objects}}

{{科德韋爾天體}}

[[Category:瀰漫星雲]]
[[Category:反射星雲]]
[[Category:發射星雲]]
[[Category:疏散星團]]
[[Category:科德韋爾天體|019b]]
[[Category:IC天體|5146]]
[[Category:天鵝座]]
[[Category:沙普利斯天体|125]]

IC 5146 - 版本历史

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