Bubble Nebula
{{Short description|Emission nebula in the constellation Cassiopeia}}
{{For|the Bubble Nebula in Barnard's Galaxy|Bubble Nebula (NGC 6822)}}
{{Infobox nebula
| name = NGC 7635
| image = File:The Bubble Nebula - NGC 7635 - Heic1608a.jpg
| caption = Wide field image of NGC 7635 as captured by the Hubble Space Telescope
| type = H II REGION
| epoch = J2000
| ra = {{RA|23|20|48.3}}{{sfn|SIMBAD|2007}}
| dec = {{DEC|+61|12|06}}{{sfn|SIMBAD|2007}}
| dist_ly = 7100{{sfn|HubbleSite|2000}} to 11000{{sfn|Nemiroff|Bonnell|2004}}{{sfn|Nemiroff|Bonnell|2006}}
| dist_pc = 3,400
| size_v = 15{{prime}} × 8{{prime}}{{sfn|Kepple|Sanner|1998}}
| radius_ly = 3{{sfn|HubbleSite|2000}} to 5{{sfn|Nemiroff|Bonnell|2005}}{{sfn|Nemiroff|Bonnell|2006}}
| absmag_v =
| constellation = Cassiopeia
| notes = Shell around SAO 20575{{sfn|SIMBAD|2007}}
| names = Bubble Nebula{{sfn|SIMBAD|2007}}
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
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
Notes
{{Reflist}}
References
{{refbegin}}
- {{cite web
| author = SIMBAD | author-link = SIMBAD
| title = Results for NGC 7635
| date = February 23, 2007
| publisher = SIMBAD, Centre de Données Astronomiques de Strasbourg
| url = http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=NGC+7635
}}
- {{cite book
| last1 = Kepple
| first1 = George Robert
| last2 = Sanner
| first2 = Glen W.
| title = The Night Sky Observer's Guide
| volume = 1
| date = 1998
| publisher = Willmann-Bell, Inc.
| isbn = 978-0-943396-58-3
| pages = 108–109
}}
- {{cite web
| author = HubbleSite | author-link = HubbleSite
| title = An Expanding Bubble in Space
| date = 2000
| url= http://hubblesite.org/newscenter/archive/releases/2000/04/image/a/}}
{{sfn whitelist|CITEREFNemiroffBonnell2004|CITEREFNemiroffBonnell2005|CITEREFNemiroffBonnell2006}}
- {{Cite APOD
| title = The Bubble
| date = July 16, 2004
| access-date = }}
- {{Cite APOD
| title = NGC 7635: The Bubble Nebula
| date = November 7, 2005
| access-date = }}
- {{Cite APOD
| title = NGC 7635: The Bubble
| date = October 18, 2006
| access-date = }}
{{refend}}
External links
{{Commons category}}
- [https://web.archive.org/web/20110718094858/http://www.dsi-astronomie.de/NGC7635.html NGC7635 The Bubble Nebula]
- {{WikiSky}}
- [http://www.constellation-guide.com/bubble-nebula-ngc-7635/ 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)}}
{{Portal bar|Astronomy|Stars|Outer space}}
{{sky|23|20|48.3|+|61|12|06|7100}}