Location & Date	Backyard, Abbott Observatory- Long Island, NY,  July & August 2022
Telescope	TMB130SS  910mm F/7 APO, Moonlite focuser, Losmandy G11 Gemini Image scale 1.54 arcsec/pixel
Camera	SBIG ST-10XME Baader Ha SII OIII  5nm  filters CCD temp -15°C
Exposures	Ha-18x5m  OIII-12x10m   SII-18x5m  Bin 1x1 for each of the 4 panels
Planning & Acquisition	Sequence Generator Pro Mosaic Tool - 4 panel Mosaic
Processing	CCDStack -  Calibration, Debloom Astro Pixel Processor - frame processing and mosaic assembly, Ha SII OIII combine Adobe PS -  Ha SII OIII processing, JPEG conversion RC-Astro Star XTerminator & NoiseXTerminator This is a 4-panel mosaic using the HST pallette where Ha=green, OIII=blue and SII=red

Wikipedia-

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, at an estimated distance of 725 parsecs (2400 light-years) from Earth.

Sh2-155 was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue, being a part of the much larger Cep OB3 Association. 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.

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. 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. 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.

SH2-155 position shown relative to our location (Sun) in the Milky Way Galaxy

Galatic Longitude: 110.2

Galatic Latitude: 2.6

Distance from Galatic Plane:180 ly above the galatic plane

Above image and info provided by Our Galaxy 3D Atlas application and used with permission by Otherwise