Wikipedia Description:
NGC 7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region[1] 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[1] magnitude young central star, SAO 20575 (BD+60°2522).[7] 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.[7] It was discovered in November 1787 by William Herschel.[5] The star BD+60°2522 is thought to have a mass of about 44 M☉.
Acquisition Details:
| Telescope | Takahashi TOA-130 |
| Optics | Takahashi TOA-645 Flattener |
| Filter | Optolong Ultimate Dual Band |
| Camera | ASI2600MC Pro OSC |
| Integration Time | 6.25 hours |
| Subframes | 75 x 300 seconds |
| Date | October 4, 2025 |
| Location | Carlsbad, California |