NGC 7635, known as Bubble Nebula is an HII region in the constellation Cassiopeia. Bubble shape structure is caused by the solar wind caused by a massive star.
Well, I must admit, the Hubble Space Telescope has a better resolution, but my telescope has a better price-performance ratio.
| Telescope: | Newton 254/1000 mm |
| Aperture: | 254 mm |
| Focal length: | 730 mm |
| Mount | Gemini G53f |
| Autoguiding | ZWO 174MM, TS 60/240 mm |
| Camera: | Moravian instruments G2 8300M @ -30C |
| Corrector: | ASA 0.73 reducer |
| Filters: | Baader Ha, OIII, SII |
| Exposure: | 39x Ha, 35x OIII, 32x SII, 300 s, bin 1×1 |