View source for NGC 604

{{Short description|H II region inside the Triangulum Galaxy}}
{{Infobox nebula |
| image = NGC 604 (NIRCam image) (weic2407a).jpg
| caption = {{longitem|NGC 604 inside the [[Triangulum Galaxy]]<br />''(viewed by the [[James Webb Space Telescope]])''|style=padding: 4px 0;}}
| name = [[New General Catalogue|NGC]] 604
| type = H II region
| epoch = [[Epoch (astronomy)#Julian years and J2000|J2000]]
| ra = {{RA|01|34|33.2}}<ref name="ned">{{cite web
  | title=NASA/IPAC Extragalactic Database
  | work=Results for NGC 604
  | url=http://nedwww.ipac.caltech.edu/
  | access-date=2006-09-03 }}</ref>
| dec = {{DEC|+30|47|06}}<ref name="ned" />
| dist_ly = [[1 E22 m|2,700,000]]
| dist_pc = 840,000<ref name="Barba2004">{{cite journal
  | author=Barba, Rodolfo
  | title=An in-depth analysis of a prototypical giant H II region: NGC 604
  | journal=HST Proposal ID #10419
  | date=2004
  | pages=10419
  | bibcode=2004hst..prop10419B }}</ref>
| appmag_v = +14.0<ref name="ned" />
| size_v = 1.93{{prime}} x 1.2{{prime}} [[Minute of arc|arcmins]]<ref name="ned" />
| constellation = [[Triangulum]]
| radius_ly = 760<ref>distance × sin( diameter_angle / 2 ) = 760 ly. radius</ref>
| absmag_v = -13.8
| notes = massive [[H II region]]<br />3.5 million years old<ref name="Barba2004"/>
| names =
}}

'''NGC 604''' is an [[H II region]] inside the [[Triangulum Galaxy]]. It was discovered by [[William Herschel]] on September 11, 1784. It is among the [[List of largest nebulae|largest H II region]]s in the [[Local Group]] of galaxies; at the galaxy's estimated distance of 2.7 million [[light-year]]s, its longest diameter is roughly 1,520 light years (~460 [[parsec]]s), over 40 times the size of the visible portion of the [[Orion Nebula]]. It is over 6,300 times more [[luminosity|luminous]] than the [[Orion Nebula]], and if it were at the same distance it would outshine [[Venus]]. Its gas is [[ionization|ionized]] by a cluster of massive [[star]]s at its center<ref>{{Cite APOD|date=2 November 2002|title=NGC 604: Giant Stellar Nursery|access-date=}}</ref> with 200 stars of spectral type [[O star|O]] and [[Wolf-Rayet star|WR]], a mass of 10<sup>5</sup> [[solar mass]]es, and an age of 3.5 million years;<ref name="Barba2004"/> however, unlike the [[Large Magellanic Cloud]]'s [[Tarantula Nebula]] central cluster ([[R136]]), NGC 604's one is much less compact and more similar to a large [[stellar association]].<ref name="Maíz-Apellaníz2004">{{cite journal
  | author=Maíz-Apellániz, J.
  | author2=Pérez, E.
  | author3=Mas-Hesse, J. M.
  | title=NGC 604, the Scaled OB Association (SOBA) Prototype. I. Spatial Distribution of the Different Gas Phases and Attenuation by Dust
  | journal=The Astronomical Journal
  | date=2004
  | volume=128
  | issue=3
  | pages=1196–1218
  | bibcode=2004AJ....128.1196M
  | doi=10.1086/422925|arxiv = astro-ph/0406130
| s2cid=8099926
 }}</ref>

==See also==
* [[Tarantula Nebula]]
* [[List of largest nebulae]]

==Notes==
* Some data in the table was updated from Sue French's column "Deep-sky Wonders", in the January 2006 issue of [[Sky & Telescope]], p.&nbsp;83.

==References==
{{Reflist}}

== External links ==
{{commons}}
* [http://messier.seds.org/more/m033_n604.html Nebula NGC 604 @ SEDS Messier pages]
* {{APOD |date=16 August 1996 |title=NGC 604}}
* {{APOD |date=11 December 2012 |title=NGC 604: Giant Stellar Nursery}}

{{Triangulum Galaxy}}
{{NGC objects:500-999}}
{{Triangulum}}

{{DEFAULTSORT:NGC 0604}}
[[Category:H II regions]]
[[Category:Triangulum]]
[[Category:NGC objects|0604]]
[[Category:Triangulum Galaxy]]
[[Category:Astronomical objects discovered in 1784|17840911]]
[[Category:Star-forming regions]]
[[Category:Discoveries by William Herschel]]


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