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Q725471
Sign in to saveAlso known as Bubble Nebula, New General Catalogue 7635, Sharpless 162
emission nebula in the constellation Cassiopeia
Key facts
- Right ascension
- 23 20 48.3
- Declination
- +61 ° 12 ′ 06 ″
- Distance
- 7100 to 11000 ly (3,400 pc )
- Apparent dimensions v
- 15 ′ × 8 ′
- Constellation
- Cassiopeia
- Radius
- 3 to 5 ly
- Notable features
- Shell around SAO 20575
- Designations
- Bubble Nebula , Sharpless 162 (Sh2-162), Caldwell 11
via Wikipedia infobox
~2 min read
Encyclopedic overview
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☉.
Amateur observation
Excerpted from Wikipedia’s “Q725471” article, available under the CC BY-SA 4.0 licence.