Web Description: Sh2-157, as designated in the Sharpless Catalog, is an emission nebula located in the constellation Cassiopeia approximately 8,000 light-years distant. It is only a short distance from the famous Bubble Nebula. The small open cluster of stars located in the upper right of the image is designated NGC 7510 and lies approximately 11,400 light-years away. The small bright nebular object just below the “blue left pincher” is designated Sharpless 157a. It is a nebula surrounding the Wolf Raynet star WR-157.
Acquisition Details:
| Telescope | Takahashi TOA-130 |
| Optics | Takahashi TOA-35 Reducer |
| Filter | Optolong Ultimate Dual Band |
| Camera | ASI2600MC Pro OSC |
| Integration Time | 7.7 hours |
| Subframes | 46 x 600 seconds |
| Date | September 3-4, 2025 |
| Location | Carlsbad, California |