M52 to Sharpless 2-157

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This is 3 frame mosaic stretching across the border of the constellations Cassiopeia and Cepheus. At upper right is the open cluster M52, and just to the left of this cluster is the beautiful Bubble Nebula (NGC 7635). The aptly named, but tiny (in this widefield view, it sits in the middle of the blue region buried in the larger yellow-red gas clouds) Bubble Nebula is a shell of gas created by the outflowing stellar wind of a massive central star, and is estimated to measure approximately 7 light years across. To the left of the Bubble Nebula is the large complex of Sharpless 2-157, which to me appears a bit like a crab claw. Near the very bottom of the lower faint arm of this emission nebula lies another tiny open cluster of stars, NGC 7510. A number of other areas of nebulosity are also visible, such as the large diffuse Sharpless 2-161 at lower right, and embedded in its edge the small, bright nebula NGC 7538. The image was processed in a modified Hubble palette, with additional exposures through RGB filters to capture more accurate colors of the starfield.

  Optics:Stellarvue SVQ100 
Camera:ZWO ASI 1600MM cooled CMOS camera 
Mount:Astrophysics Mach1 (auto-guided) 
Exposure info:~ 21 hours total exposure split across 3 frames 
Filters used:Astrodon H-alpha, SII (5 nm), OIII (3 nm), Red Continuum, Astronomik RGB 
date:October/November 2017