Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  Bubble nebula  ·  NGC 7635
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NGC 7635 • The Bubble Nebula in SHO, Douglas J Struble
NGC 7635 • The Bubble Nebula in SHO
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NGC 7635 • The Bubble Nebula in SHO

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NGC 7635 • The Bubble Nebula in SHO, Douglas J Struble
NGC 7635 • The Bubble Nebula in SHO
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NGC 7635 • The Bubble Nebula in SHO

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Description

NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the 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 magnitude young central star, SAO 20575 (BD+60°2522). 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. It was discovered in 1787 by William Herschel. The star BD+60°2522 is thought to have a mass of about 44 M☉.

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NGC 7635 • The Bubble Nebula in SHO, Douglas J Struble