Bubble Nebula
NGC 7635, also known as the Bubble Nebula, 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☉.
| Emission nebula | |
|---|---|
| H II region | |
Wide field image of NGC 7635 as captured by the Hubble Space Telescope | |
| Observation data: J2000 epoch | |
| Right ascension | 23h 20m 48.3s |
| Declination | +61° 12′ 06″ |
| Distance | 7100 to 11000 ly (3,400 pc) |
| Apparent magnitude (V) | ~10 |
| Apparent dimensions (V) | 15′ × 8′ |
| Constellation | Cassiopeia |
| Physical characteristics | |
| Radius | 3 to 5 ly |
| Notable features | Shell around SAO 20575 |
| Designations | Bubble Nebula Sharpless 162 (Sh2-162) Caldwell 11 |
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