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Sh2-155 / Cave Nebula

Classification: Emission, Reflection, Dark Nebula. Sh2-155, C9, vdB 155, LDN 1216.
Constellation: Cepheus (Cep)
Object Location: Ra 22h 57m 31s Dec +62° 42’36” (current)
Size & Distance: 50.0 x 30.0 Apx 2400 light years.

Date & Location: 10-01-2016 Palomar Mountain, CA
Exposure: LRGB of 60, 60, 60, 60. 4x15min ea (bin 1x1)
Optics: Telescope Engineering Company APO180FL @ f/5.23 using an Astro-Physics TCC160 F/L 941mm.
Mount: Astro-Physics 1200 GTOCP4 / ATS 10x36 pier.
Camera: FLI-ML16200 @-25c / FLI CFW2-7 / FLI-Atlas focuser / Guided by SBIG ST-I / w OAG.
Filters: Astrodon G2 LRGB
Software: MaxImDL 6.10, Photoshop CS5, CCDStack, Topaz Labs.

Notes: Sky conditions: Average seeing, No wind, Temp low 60’s
Image Field of view is 78.8 x 98.5 arcmin.

Sh2-155, Also known as the Cave Nebula and Caldwell 9, is a dim and very diffuse bright nebula within a larger nebula complex containing emission, reflection, and dark nebulosity. It is located in the constellation Cepheus.The nebula gets its name Cave Nebula from the dark lane abutting the brightest curve of emission nebulosity which gives the appearance of a deep cave when seen through a telescope visually.