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NGC7635 / Bubble Nebula

Classification: Bright Diffuse Emission Nebula / Caldwell C11 / Sh2-162
Constellation: Cassiopeia (Cas)
Object Location: Ra 23h 21m 28s Dec +61° 17’35° (current)
Size & Distance: 15x15 Apx 7,100 light-years

Date & Location: 07-26-14 Palomar Mountain
Exposure: SHO-RGB 60, 60, 60, 2, 2, 2, Sll=R, Ha=G, Olll=B, 6 x 10ea RGB 4 x 2 ea. (bin 1x1).
Optics: Telescope Engineering Company APO180FL @ f/5.23 using an Astro-Physics TCC160 F/L 940mm
Mount: Astro-Physics 1200 GTO / ATS 10x36 pier.
Camera: FLI-MLx694 @-20c / CFW2-7 / FLI-Atlas focuser / Guided by SBIG ST-I / w OAG.
Filters: Astrodon 3nm Ha, Sll, Olll
Software: MaxImDL 6.03, Photoshop CC, CCDStack, Topaz

Notes: Sky conditions: Average seeing, calm winds, Temp 75°
Image Field of view is 36 x 45 arcmin. Image Scale 0.72 arcsec/pix
RGB were used just for the stars.

NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude star. The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow.