NGC 7635, also known as 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.
- Location: Harold Campbell Everglades
- Scope: Vixen VMC200L
- Camera: Fli ML8300 with CFW2-7 and Astrodon Filters
- 600 sec LUM / 300 sec subs RGB bin 2 for 4 hours and 1 hour of HA 600 sec in Maxim DL
- Combined in Maxim DL and processed in Pixinsight
- Taken 10/21/16