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{{Infobox nebula |
| image = Fragment of NGC 2175.tiff
| caption= [[哈伯太空望遠鏡]]拍攝的恆星托兒所NGC 2174。
| credit = [[ESA]]/[[哈伯太空望遠鏡|Hubble]]和[[NASA]]
| name = [[星雲和星團新總表|NGC]] 2174
| epoch = [[J2000]]
| type = 電離氫區

| constellation = [[獵戶座]]
| ra = {{RA|06|09.7}}<ref name="simbad">{{cite web
| title=SIMBAD Astronomical Database
| work=Results for NGC 2174
| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+2174&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
| accessdate=13 July 2011
| archive-date=2017-01-16
| archive-url=https://web.archive.org/web/20170116191109/http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+2174&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
| dead-url=no
}}</ref>
| dec = {{DEC|+20|30}}<ref name="simbad" />
| dist_ly = 6,400[[光年]]{{Citation needed|date=February 2007}}
| dist_pc = 2,000
| appmag_v = 6.8{{Citation needed|date=February 2007}}
| size_v = 40′{{Citation needed|date=February 2007}}
| mass_kg =
| mass_msol = -
| radius_ly =
| v_hb = -
| age =
| notes =
| names =
}}
'''NGC 2174'''（也稱為'''猴頭星雲'''）是在[[獵戶座]]的一個[[電離氫區]] <ref name="simbad" />，並且與[[疏散星團]][[NGC 2175]]結合在一起<ref name="simbad" />。它與[[地球]]的距離大約是6,400[[光年]]。這個[[星雲]]可能是通過{{link-en|分層坍塌|hierarchical collapse}}形成的<ref name="Coteraetal2006">{{cite conference
| author=Cotera, A. |display-authors=4 | author2=Hester, J. | author3=Healy, K. | author4=Snider, K. | author5=Simpson, J. | author6=Whitney, B.
| title=Using Spitzer IRAC observations to Compare Modes of Star Formation in G305.35+0.7 and NGC 2174/5
| conference=Triggered Star Formation in a Turbulent ISM, International Astronomical Union Symposium
| date=August 2006
| location=Prague, Czech Republic
| id=S237, #98
| publication-date=2006
| bibcode=2006IAUS..237E..98C }}{{Dead link|date=July 2010}}</ref>。

NGC 2174和[[NGC 2175]]這兩個識別碼在使用上經常混淆不清。可能適用於整個星雲，或是最亮的結，或是它所包含的星團。伯納姆的{{link-en|天體手冊|Celestial Handbook}}以2174/2175列出整個星雲，但沒有提到星團<ref>Robert Burnham, Jr, ''Burnham's Celestial Handbook'', Dover, 1978, p. 1280.</ref>。NGC專案（對原始描述的註解工作）指定NGC 2174是位於{{RA | 06 | 09 | 23.7}}，{{DEC | + 20 | 39 | 34}}突出的結，和NGC 2175是整個星雲和星團的擴展<ref name="ngcProject">{{cite web
|url=http://www.ngcicproject.org/pubdb.htm
|title=Public Database
|at=Results for NGC 2174 and NGC 2175
|website=NGC/IC Project
|accessdate=12 January 2014
|archive-url=https://web.archive.org/web/20090528100240/http://www.ngcicproject.org/pubdb.htm
|archive-date=2009-05-28
|dead-url=yes
}}</ref>。Simbad使用NGC 2174是星雲，而NGC 2175是星團<ref name="simbad" />
<ref name="simbad2175">{{cite web
| title=SIMBAD Astronomical Database
| work=Results for NGC 2175
| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=ngc+2175&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
| accessdate=13 January 2014
| archive-date=2018-08-27
| archive-url=https://web.archive.org/web/20180827093658/http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+2175&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
| dead-url=no
}}</ref>。
[[File:PIA19836-NGC2174-MonkeyHeadNebula-IR-Spitzer-20150820.jpg|thumb|center|250px|<center>[[史匹哲太空望遠鏡]]看見的NGC 2174紅外線影像。</center>]]

== 參考資料 ==
{{Reflist}}

== 外部連結 ==
* {{APOD |date=8 December 2006 |title=NGC 2174: Emission Nebula in Orion}}
* {{APOD |date=9 February 2011 |title=NGC 2174: Stars Versus Mountains}}
* [http://www.constellation-guide.com/monkey-head-nebula/ Monkey Head Nebula at Constellation Guide]{{Wayback|url=http://www.constellation-guide.com/monkey-head-nebula/ |date=20170129083424 }}

{{Ngc25}}
{{NGCReference|2174}}

[[Category:電離氫區]]
[[Category:獵戶座]]
[[Category:NGC天體|2174]]

NGC 2174 - 版本历史

imported>InternetArchiveBot：​补救4个来源，并将0个来源标记为失效。) #IABot (v2.0.7

imported>InternetArchiveBot：补救4个来源，并将0个来源标记为失效。) #IABot (v2.0.7