View source for NGC 2175

{{Short description|Open cluster in the constellation Orion}}
{{Infobox open cluster|
| image = File:Monkey Head Nebula (49545230921).jpg
| caption = 
| name = NGC 2175
| type = 
| epoch = [[J2000]]
| ra = {{RA|06|09|39}}
| dec = {{DEC|+20|29|15}}
| dist_ly = 6,350 [[Light-year|ly]]
| appmag_v = 6.8
| size_v = 18{{prime}}
| constellation = [[Orion (constellation)|Orion]]
| radius_ly = 
| absmag_v = 
| notes = 
| names = [[Collinder catalogue|Cr]] 84
}}

'''Open Cluster NGC 2175''' (also known as '''OCL 476''' or '''Cr 84''') is an [[open cluster]] in the [[Orion constellation]], embedded in a diffusion nebula. It was discovered by [[Giovanni Batista Hodierna]] before 1654 and independently discovered by [[Karl Christian Bruhns]] in 1857. NGC 2175 is at a distance of about 6,350 [[light year]]s away from [[Earth]].

The nebula surrounding it is [[Sharpless catalog]] Sh 2-252, and it is sometimes called the '''Monkey Head Nebula''' due to its appearance.

There is some equivocation in the use of the identifiers [[NGC 2174]] and NGC 2175. These may apply to the entire nebula, to its brightest knot, or to the star cluster it includes. Burnham's ''Celestial Handbook'' lists the entire nebula as 2174/2175 and does not mention the star cluster.<ref>{{cite book|author=Robert Burnham, Jr|title=Burnham's Celestial Handbook|publisher=Dover|year=1978|page=1280}}</ref> The NGC Project (working from the original descriptive notes) assigns NGC 2174 to the prominent knot at J2000 {{RA|06|09|23.7}}, {{DEC|+20|39|34}} and NGC 2175 to the entire nebula, and by extension to the star cluster.<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|access-date=12 January 2014|archive-url=https://web.archive.org/web/20090528100240/http://www.ngcicproject.org/pubdb.htm|archive-date=28 May 2009|url-status=dead}}</ref> Simbad uses NGC 2174 for the nebula and NGC 2175 for the star cluster.<ref name="simbad2174">{{cite web|work=SIMBAD Astronomical Database|title=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|access-date=2011-07-13}}</ref><ref name="simbad2175">{{cite web|work=SIMBAD Astronomical Database|title=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|access-date=2014-01-13}}</ref>

[[File:NGC2175 CDK Small 03.jpg|thumb|NGC 2175, [[LRGB]]Ha image with 17" PlaneWave CDK by W4SM]]

==References==
{{reflist}}

==External links==
* [http://messier.seds.org/xtra/ngc/n2175.html NGC 2175 @ SEDS NGC objects pages]
* {{Sky-Map.org}}

{{Stars of Orion}}
{{NGC objects:2000-2499}}

{{Sky|06|9.8|00|+|20|19|00|6350}}

[[Category:NGC objects|2175]]
[[Category:Open clusters]]
[[Category:Orion (constellation)]]

{{star-cluster-stub}}