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Classification: Sh2-157-M52-NGC7635-NGC7538
Constellation: Cassiopeia (Cas)
Object Location: Ra 23h 20m 07s Dec +60° 46’60° (current)(centerd)
Size & Distance: 1.6° x 2.5° Apx 5000-11,000 light years.

Date & Location: 08-2/3-2013 Palomar Mountain, CA.
Exposure: Hubble Palette SHO, Sll=R, Ha=G, Olll=B, Ha=12, Sll=11, Olll=8, all 15min (bin 1x1)
Optics: Takahashi Epsilon-210 f3 630mm. w/ FLI-PDF
Mount: Astro-Physics 1200 GTO / ATS 10x36 pier.
Camera: FLI-ML6303E @-20c / CFW2-7 / TV60APO / w SBIG-RGH
Filters: Astrodon 3nm Ha, Sll, Olll
Software: MaxImDL 4.56, Photoshop CS5

Notes: Sky conditions: Above average seeing, Calm wind, Temp 60°
Image Field of view is 101 x 152 arcmin.

This image contains many objects in the field.
Upper left is NGC 7538 (Sh2-158) an emission nebula and is about 9,100 light-years from Earth. It is home to the biggest yet discovered protostar  which is about 300 times the size of our Solar System.
Bottom left is M52 an Open Cluster at about 5000 light-years.
Left center NGC 7635 (Sh2-162) the Bubble Nebula is an emission Nebula at about 7000 light-years.
Upper right is Sh2-157 an emission nebula, sometimes referred to as (The Claw Nebula) at about 8000 light-years.
The small patch of green just to the left of the claw maybe an LBN168 nebula?