{{Short description|HII Region}} {{Infobox nebula | image = | caption= A photo of Sh 2-9 and σ Scorpii (to the upper right) and M4 (lower left), taken by Dean Salman | name = Sh 2-9 | type = Emission | epoch = J2000.0 | ra = 16h 21m 11.31s | dec = -25d 35m 34.05 | dist_ly = 568 | dist_pc = 174 | appmag_v = 2.89 | size_v = | constellation = Scorpius | radius_ly = | absmag_v = | notes = | names = Gum 65, LBN 1101, HD 147165, IRAS 16181-2528 }} '''Sh 2-9''', also known as Gum 65, is combination emission and reflection nebula in the Scorpius constellation, surrounding the multiple star system Sigma Scorpii. Sigma Scorpii is 1° to the northwest of Messier 4,<ref>{{cite web |url=http://sharplesscatalog.com/sharpless.aspx |title=SH2-9 |publisher=Sharpless Catalog | website=SharplessCatalog.Com}}</ref><ref name=":0" /> and the nebula can be easily seen with small telescopes.
Sharpless 9 is a red emission nebula that surrounds the star Sigma Scorpii.<ref name=":0">{{Cite book|url=https://books.google.com/books?id=tNDvBwAAQBAJ&q=Sharpless+9+nebula&pg=PA82|title=Structures in Space: Hidden Secrets of the Deep Sky|last1=Abrams|first1=Bernard|last2=Stecker|first2=Michael|date=2012-12-06|publisher=Springer Science & Business Media|isbn=9781447104414|language=en}}</ref> It is thought the star Sigma Scorpii, a variable giant star, is ionizing this region.<ref>{{Cite web|url=http://galaxymap.org/cat/list/gum/61|title=The Gum Catalog|website=galaxymap.org|access-date=2019-10-30}}</ref> It is also recorded as reflection nebula C130.<ref name=":1" />
This region is noted as both an emission and reflection nebula, although sometimes only one aspect is noted.<ref>{{Cite book|url=https://books.google.com/books?id=3IpZrC0BeewC&q=%22Sh2-9%22+-wikipedia&pg=PP125|title=The Practical Astronomer's Deep-sky Companion|last=Gilmour|first=Jess K.|date=2003|publisher=Springer Science & Business Media|isbn=9781852334741|language=en}}</ref><ref name=":0" />
The magnitude 1.1 Antares is 2° to the southeast of this nebula.<ref name=":0" />
One of strongest 2.3 GHz sources in the region coincides with Sharpless 9.<ref name=":1">{{cite journal|display-authors=etal |last1=E. E. Baart |title=A 2.3 GHz radio continuum map of the upper Scorpio region |journal=Astronomy and Astrophysics |date=Dec 1980 |volume=92 |page=156 |bibcode=1980A&A....92..156B |url=http://adsabs.harvard.edu/full/1980A%26A....92..156B}}</ref>
There is a radio source on the edge, and it has been proposed that this is because there is a collision between this nebula and the dark nebula Kh 527.<ref name=":1" />
== Catalogs == Examples:<ref name=":1" />
* Sharpless 9 * Gum 65 * Cederblad 140
==References== {{Reflist}}
==External links== *[http://www.azdeepskies.com/nebula_images/sharpless_2-9.html Image of Sharpless-2 9] {{Webarchive|url=https://web.archive.org/web/20221005191243/https://azdeepskies.com/nebula_images/sharpless_2-9.html |date=2022-10-05 }}
{{Sh2 objects}} {{Gum catalogue}}
Category:Scorpius Category:Emission nebulae Category:Reflection nebulae
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