View source for Sh 2-54

{{Short description|Nebula in the constellation Serpens}}
{{Infobox nebula
| name     = Sh 2-54
| image    = The star cluster NGC 6604 and its surroundings.jpg
| caption  = Sh 2-54 nebula surrounding the star cluster [[NGC 6604]]
| credit   = [[ESO]]
| type     = H II region
| epoch    = [[Epoch (astronomy)#Julian years and J2000|J2000]]
| ra       = {{RA|18|17|53}}<ref name="simbad" />
| dec      = {{DEC|&minus;11|40|58}}<ref name="simbad" />
| dist_ly  = 6,200<ref name="NGC6604"/>
| appmag_v =
| size_v   = 140 [[Minute of arc|arcmins]]<ref name="Sharpless">{{cite journal|author=Sharpless, Stewart|title=A Catalogue of H II Regions|journal=Astrophysical Journal Supplement|volume=4|pages=257|date=December 1959|doi=10.1086/190049|bibcode=1959ApJS....4..257S}}</ref>
| constellation  = [[Serpens]]
| radius_ly= 126.25
| absmag_v =
| notes    =
| names    = [[RCW Catalogue|RCW]] 167, Gum 84/85, W35, LBN 72<ref name="simbad" />
}}
'''Sh 2-54''' is an extended [[Nebula|bright nebula]] in the [[constellation]] of [[Serpens]].<ref name="simbad">{{cite simbad
| title=SH 2-54
| access-date=2011-06-05
}}</ref>
In its core there are many [[protostars]] and many [[infrared]] sources; some of these sources, like [[IRAS]]&nbsp;18151−1208, are most probably very young high-mass stars.<ref name="Davis2004">{{cite journal|author=Davis, C. J.|author2=Varricatt, W. P.|author3=Todd, S. P.|author4=Ramsay Howat, S. K.|title=Collimated molecular jets from high-mass young stars: IRAS 18151-1208|volume=425|pages=981–995|date=October 2004|doi=10.1051/0004-6361:20041298|bibcode=2004A&A...425..981D|journal=Astronomy and Astrophysics|issue=3|doi-access=free}}</ref> The older star population in this region has an average age of 4–5 million years, and its components are grouped in the [[open cluster]] [[NGC 6604]].<ref name="NGC6604">{{cite journal|author=Reipurth, B.|title=The Young Cluster NGC 6604 and the Serpens OB2 Association|journal=Handbook of Star Forming Regions, Volume II: The Southern Sky|volume=5|pages=590|date=December 2008|bibcode=2008hsf2.book..590R}}</ref>
Sh 2-54 belongs to an extended nebulosity that includes also the [[Eagle Nebula]] and the [[Omega Nebula]].<ref>{{cite journal|display-authors=4|author=Sofue, Y.|author2=Handa, T.|author3=Fuerst, E.|author4=Reich, W.|author5=Reich, P.|title=Giant stellar-wind shell associated with the H II region M16|journal=Publications of the Astronomical Society of Japan|volume=38|pages=347–360|date=1986|bibcode=1986PASJ...38..347S}}</ref> The young high-mass stars of this region constitute the Serpens&nbsp;OB1 and Serpens&nbsp;OB2 [[OB association]].<ref name="NGC6604"/>
==Gallery==
<gallery mode="packed" heights=200px>
Image:Serpent%E2%80%99s_Nebula.jpg|Serpent's Nebula<ref>{{cite web |title=Serpent's Nebula |url=https://noirlab.edu/public/images/iotw2104a/ |website=noirlab.edu/public/ |access-date=3 February 2021 |language=en}}</ref>
</gallery>
== See also ==
*[[H II region]]
==References==
{{reflist}}
==External links==
{{commons category|Sh2-54}}
*[http://galaxymap.org/cgi-bin/sharpless.py?s=51 Sky-Map.org – Sharpless Catalogue (from 51 to 60)] {{Webarchive|url=https://web.archive.org/web/20110930104709/http://galaxymap.org/cgi-bin/sharpless.py?s=51 |date=2011-09-30 }}
*[http://galaxymap.org/avedisova/html/277.html Star Formation Region Avedisova 277 – Galaxy Map]
{{Sh2 objects}}
{{RCW}}
{{Gum catalogue}}
{{Serpens}}
{{Sky|18|17|53|−|11|40|58|6000}}
{{DEFAULTSORT:Sh 2-54}}
[[Category:H II regions]]
[[Category:Serpens]]
[[Category:Sharpless objects|054]]
[[Category:Star-forming regions]]
[[Category:Stellar associations]]