Nebula
Bubble Nebula
Nebula · C11 · NGC 7635
Nebula in Cassiopeia
Photo: NASA, ESA, Hubble Heritage Team · Public domain · Wikimedia Commons
The Bubble Nebula, also known as NGC 7635, Sharpless 162, or Caldwell 11, is an H II region 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 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 November 1787 by William Herschel. The star BD+60°2522 is thought to have a mass of about 44 M☉.
Description from Wikipedia (CC BY-SA 4.0).
In your sky
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Key facts
Distance
~7,100 light-years
Apparent mag.
+10
Apparent size
15.0′ × 8.0′
Best seen with
Telescope
Catalogue
C11 · NGC 7635
Did you know
- Listed as Caldwell 11 in the Caldwell catalogue, also known as NGC 7635.
- Found in the constellation Cassiopeia.
- Needs a telescope to see clearly.
