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{{Short description|Emission nebula in the constellation Cassiopeia}}{{For|the Bubble Nebula in Barnard's Galaxy|Bubble Nebula (NGC 6822)}}

factoids

{{sfn2007}}+6106}}{{sfn2007}}HubbleSiteNemiroff2004}}{{sfnBonnell|2006}}| dist_pc = 3,400URL-STATUS=DEADTITLE=NGC-IC PROJECT DATABASE, 2008-12-15, Kepple1998}}HubbleSiteNemiroff2005}}{{sfnBonnell|2006}}| absmag_v =Cassiopeia (constellation)>CassiopeiaSAO 20575{{sfn>SIMBAD|2007}}SIMBADSharpless catalog>Sharpless 162 (Sh2-162)Caldwell 11}}NGC 7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region{{sfn|SIMBAD|2007}} emission nebula in the constellation Cassiopeia. It lies close to the open cluster Messier 52. The "bubble" is created by the stellar wind from a massive hot, 8.7{{sfn|SIMBAD|2007}} magnitude young central star, SAO 20575 (BD+60°2522).{{sfn|Nemiroff|Bonnell|2005}} The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow.{{sfn|Nemiroff|Bonnell|2005}} It was discovered in November 1787 by William Herschel. The star BD+60°2522 is thought to have a mass of about {{solar mass|44}}.

Amateur observation

(File:Bubble Nebula.jpg|thumb|left|NGC 7635 and its environs imaged through an 8-inch amateur telescope)With an {{convert|8|or|10|in|mm|adj=on}} telescope, the nebula is visible as an extremely faint and large shell around the star.{{sfn|Kepple|Sanner|1998}}{{sfn|SIMBAD|2007}} The nearby 7th magnitude star on the west hinders observation, but one can view the nebula using averted vision.{{sfn|Kepple|Sanner|1998}} Using a {{convert|16|to|18|in|mm|adj=on}} scope, one can see that the faint nebula is irregular, being elongated in the north south direction.{{sfn|Kepple|Sanner|1998}}{{clear left}}

See also

• Lists of nebulae

Notes

{{Reflist}}

References

• WEB

,

• BOOK

,

• WEB

{{sfn whitelist|CITEREFNemiroffBonnell2004|CITEREFNemiroffBonnell2005|CITEREFNemiroffBonnell2006}}

• APOD

• APOD

• APOD

External links

{{Commons category}}

• weblink" title="web.archive.org/web/20110718094858weblink">NGC7635 The Bubble Nebula
• {{WikiSky}}
• Bubble Nebula at Constellation Guide
• {{APOD |title=NGC 7635: Bubble in a Cosmic Sea |date=November 23, 2016 }}

{{Catalogs|NGC=7635|C=11}}{{Sh2 objects}}{{Caldwell catalogue}}{{Ngc80}}{{Cassiopeia (constellation)}}