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Classification: Planetary Nebula Sh2-188 / Simiez 22
Constellation: Cassiopeia (Cas)
Object Location: Ra 01h 31m 37s Dec +58° 26’52° (current)
Size & Distance: 10.0 x 3.0 Apx 2800 light years.

Date & Location: 07-20/21-2012 Palomar Mountain, CA.
Exposure: Hubble Palette SHO, 210,210,210 14x15 ec. (bin 1x1) 10:30 total.
Optics: Telescope Engineering Company APO160FL @ f/7.2 F/L 1152mm.
Mount: Astro-Physics 900 GTO / ATS 10x36 pier
Camera: SBIG-ST10XME @-10c / Guided by TV60APO / w SBIG-RGH
Filters: Astrodon 3nm Ha, Sll, Olll
Software: MaxImDL 4.56, Photoshop CC, Topaz Studio.

Notes: Sky conditions: Average seeing, Light wind, Mid 75’s
Image Field of view is 34 x 24.5 arcmin. Image Scale 1.2 arcsec/pix
This image was an Astronomy Magazine Picture Of The Day, Aug, 2012

Sh2-188 is an unusual planetary nebula located in Cassiopeia. The expanding gas is colliding with ambient gas in the interstellar medium. The nebula is nearly circular in shape but is much brighter in the upper right because the central star is moving rapidly in that direction.

It was discovered at the Simiez observatory in Russia in 1951
Note; Image re-processed 1-8-2020