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| names = Bubble Nebula{{sfn|SIMBAD|2007}}<br />[[Sharpless catalog|Sharpless]] 162 (Sh2-162)<br />[[Caldwell catalogue|Caldwell]] 11
| names = Bubble Nebula{{sfn|SIMBAD|2007}}<br />[[Sharpless catalog|Sharpless]] 162 (Sh2-162)<br />[[Caldwell catalogue|Caldwell]] 11
}}
}}
'''NGC 7635''', also known as the '''Bubble Nebula''', '''Sharpless 162''', or '''Caldwell 11''', is an [[H II region|H&nbsp;II region]]{{sfn|SIMBAD|2007}} [[emission nebula]] in the constellation [[Cassiopeia (constellation)|Cassiopeia]]. It lies close to the direction of the [[open cluster]] [[Messier 52]]. The "bubble" is created by the [[stellar wind]] from a massive hot, 8.7{{sfn|SIMBAD|2007}} [[Apparent magnitude|magnitude]] young central [[star]], SAO 20575 ([[BD+60°2522]]).{{sfn|APOD|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|APOD|2005}} It was discovered in 1787 by [[William Herschel]].<ref name="ngc"/> The star BD+60°2522 is thought to have a mass of about {{solar mass|44}}.
'''NGC 7635''', also known as the '''Bubble Nebula''', '''Sharpless 162''', or '''Caldwell 11''', is an [[H II region|H&nbsp;II region]] in the constellation [[Cassiopeia (constellation)|Cassiopeia]].{{sfn|SIMBAD|2007}} It lies close to the direction of the [[open cluster]] [[Messier 52]]. The "bubble" is created by the [[stellar wind]] from a massive hot, 8.7{{sfn|SIMBAD|2007}} [[Apparent magnitude|magnitude]] young central [[star]], SAO 20575 ([[BD+60°2522]]).{{sfn|APOD|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|APOD|2005}} It was discovered in 1787 by [[William Herschel]].<ref name="ngc"/> The star BD+60°2522 is thought to have a mass of about {{solar mass|44}}.


== Amateur observation ==
== Amateur observation ==
With an 8 or {{convert|10|in|mm|sing=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 16 to {{convert|18|in|mm|sing=on}} scope, one can see that the faint nebula is irregular, being elongated in the north south direction.{{sfn|Kepple|Sanner|1998}}
With an 8 or {{convert|10|in|mm|sing=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 16 to {{convert|18|in|mm|sing=on}} scope, one can see that the faint nebula is irregular, being elongated in the north south direction.{{sfn|Kepple|Sanner|1998}}

==Gallery==
{{gallery|align=center
| File:Bubble Nebula.jpg|Picture of NGC 7635 captured in narrowband by amateur astronomer Chuck Ayoub
| File:Bubble Nebula NGC7635 Goran Nilsson & The Liverpool Telescope.jpg|HaRGB image of the Bubble Nebula NGC 7635 by the [[Liverpool Telescope]]
| File:NGC 7635 Bubble Nebula Narrowband.jpg|Picture of NGC 7635 captured in narrowband by amateur astronomer Luca Moretti
}}


== Notes ==
== Notes ==

Revision as of 13:17, 30 November 2019

"Bubble Nebula" redirects here. For the Bubble Nebula in Barnard's Galaxy, see Bubble Nebula (NGC 6822).
NGC 7635
Emission nebula
H II region
Wide field image of NGC 7635 as captured by the Hubble Space Telescope
Observation data: J2000 epoch
Right ascension23h 20m 48.3s[1]
Declination+61° 12′ 06″[1]
Distance7100[2] to 11000[3][4] ly   (3,400 pc)
Apparent magnitude (V)~10[5]
Apparent dimensions (V)15′ × 8′[6]
ConstellationCassiopeia
Physical characteristics
Radius3[2] to 5[7][4] ly
Notable featuresShell around SAO 20575[1]
DesignationsBubble Nebula[1]
Sharpless 162 (Sh2-162)
Caldwell 11
See also: Lists of nebulae

NGC 7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region in the constellation Cassiopeia.[1] It lies close to the direction of the open cluster Messier 52. The "bubble" is created by the stellar wind from a massive hot, 8.7[1] magnitude young central star, SAO 20575 (BD+60°2522).[7] 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.[7] It was discovered in 1787 by William Herschel.[5] The star BD+60°2522 is thought to have a mass of about 44 M☉.

Amateur observation

With an 8 or 10-inch (250 mm) telescope, the nebula is visible as an extremely faint and large shell around the star.[6][1] The nearby 7th magnitude star on the west hinders observation, but one can view the nebula using averted vision.[6] Using a 16 to 18-inch (460 mm) scope, one can see that the faint nebula is irregular, being elongated in the north south direction.[6]

Notes

  1. ^ a b c d e f g SIMBAD 2007.
  2. ^ a b HubbleSite 2000.
  3. ^ APOD 2004.
  4. ^ a b APOD 2006.
  5. ^ a b "NGC-IC Project Database". Archived from the original on 2001-09-04. Retrieved 2008-12-15.
  6. ^ a b c d Kepple & Sanner 1998.
  7. ^ a b c APOD 2005.

References

Wikimedia Commons has media related to NGC 7635.


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