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NGC 2174

Emission nebula in the constellation Orion

Field	Value
image	File:NGC-2174.tif
caption	Monkey Head Nebula in Narrowband Sulfur-Hydrogen Alpha- Oxygen with a 1000mm telescope
name	NGC 2174
epoch	J2000
type	H II region
constellation	Orion
ra	{{cite simbad
title	NGC 2174
access-date	13 July 2011}}
dec
dist_ly	6,400
dist_pc	2,000
appmag_v	6.8
size_v	40

| access-date=13 July 2011}}

NGC 2174 (also known as Monkey Head Nebula) is an H II emission nebula located in the constellation Orion and is associated with the open star cluster NGC 2175. It was discovered on 6 February 1877 by French astronomer Édouard Stephan. It is thought to be located about 6,400 light-years away from Earth. The nebula may have formed through hierarchical collapse.{{cite conference | publication-date=2006

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. The NGC Project (working from the original descriptive notes) assigns NGC 2174 to the prominent knot at J2000 , and NGC 2175 to the entire nebula, and by extension to the star cluster.{{cite web |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 | access-date=13 July 2011 | access-date=13 January 2014

Glowing gas and dark dust do not survive well in the Monkey Head Nebula. Young stars near the center of the nebula generate stellar winds and high energy radiation that causes the nebula's material to shift into complex shapes. The nebula is primarily composed of hydrogen which glows at infrared wavelengths due to the radiation.

Hubble 24th Anniversary Images (2014)

Gallery

File:PIA19836-NGC2174-MonkeyHeadNebula-IR-Spitzer-20150820.jpg|Infrared image of NGC 2174 as viewed by the Spitzer Space Telescope File:NGC-2174.tif|Monkey Head Nebula in Narrowband Sulfur-Hydrogen Alpha- Oxygen with a 1000mm telescope File:Monkey head H alpha 385mm stephan hamel wiki.jpg|Monkey Head Nebula in hydrogen alpha focal length 384mm File:Monkey Head Nebula bi-color Ha-OIII 384mm stephan hamel wiki.jpg|Monkey Head Nebula in bi-color with a 384mm telescope File:Monkeyhead nebula Nov 24.jpg|Monkeyhead nebula taken with a 140mm refractor by amateur astronomer Mark Johnston File:NGC2174 SHO Large06.jpg|NGC 2174 (Monkey Head Nebula) in SHO palette by W4SM, 17" PlaneWave CDK scope, Louisa, VA

References

Seligman, Courtney. "New General Catalogue Objects: NGC{{nbsp}}2174".
Robert Burnham, Jr, ''Burnham's Celestial Handbook'', Dover, 1978, p. 1280.
(Aug 4, 2014). "Monkey See, Monkey Do". Astronomy.
(Mar 17, 2014). "Pillars in the Monkey Head Nebula".
(2014-03-17). "Hubble Celebrates 24th Anniversary with Infrared Image of Nearby Star Factory".

Info: Wikipedia Source

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h-ii-regions orion-(constellation) ngc-objects star-forming-regions astronomical-objects-discovered-in-1877 discoveries-by-édouard-stephan

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