Sh2-155 (also designated Caldwell 9, Sharpless 155 or S155) is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula, though that name was applied earlier to Ced 201, a different nebula in Cepheus. Sh2-155 is an ionized H II region with ongoing star formation activity,[1] at an estimated distance of 725 parsecs (2400 light-years) from Earth.[2][3]
Sh2-155[4] was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue,[5] being a part of the much larger Cep OB3 Association.[5] Although Sh2-155 is relatively faint for amateur observation, some of its structure may be seen visually through a moderately sized telescope under dark skies.[6][7]
Sh2-155 lies at the edge of the Cepheus B cloud (part of the Cepheus molecular cloud), and is ionized by young stars from the Cep OB3 association.[8] It has been suggested that radiation from the hot O-type star HD 217086 is compressing the region, triggering the formation of a new generation of stars.[9] A study of the region’s young stellar objects by the Chandra X-ray Observatory and Spitzer Space Telescope shows a progression of stellar ages in front of the cloud, supporting the hypothesis of triggered star-formation.[10][11]
（quote from Wikipedia）
| Date and Place |
2020-Oug-24,25,26 |
| Scope | Takahashi Epsilon180ED + BetaSGR Focuser |
| Mount | Skywatcher EQ8 |
| Camera | ZWO ASI6200MM-Pro : -25[deg-c] |
| Auto guiding | QHY mini guide scope + QHY5L-2M |
| Filter | Astrodon Tru-balance Gen.2 E-series LRGB Filter Astrodon Ha 5[nm] Filter |
| Exposure | Epsilon180ED + ASI6200MM-Pro L : 24×600[s], R : 12×600[s], G :12×600[s], B : 12×600[s], H:12×900[s] Total :780[min] = 13[hr] |
| Software | Astroart7 SP5 with SHS Version 6.3 beta 5 PHD Guiding 2.8.6 Pixinsight 1.8.8 Photoshop CC 2021 |