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M101-102 / Pinwheel Galaxy 

Classification: Spiral galaxy M101-102 / NGC5457
Constellation: Ursa Major (UMA)
Object Location: Ra 14h 03m 41s Dec +54° 16’43° (current)
Size & Distance: 28.8 x 26.9 Apx 21 Million light-years.

Date & Location: 04-21-2012 Little Blair Valley, CA
Exposure: LRGB, L=12, RGB= 4ea, all 10min ea. (bin 1x1)
Optics: Telescope Engineering Company APO160FL @ f/7.2 F/L 1152mm.
Mount: Astro-Physics 900 GTO / ATS 10x36 Pier
Camera: SBIG-ST10XME @ -10c
Filters: Astrodon G2 LRGB
Software: MaxImDL 4.56, Photoshop CS5, Topaz Lab.

Notes: Sky conditions: Average seeing, light winds, mid 70’s
Image Field of view is 44.3 x 29.8 arcmin.

The Pinwheel Galaxy (also known as M101 or NGC 5457) is a face-on spiral galaxy distanced 21 million light-years
Messier 101 (also known as the Pinwheel Galaxy or NGC 5457) is a face-on spiral galaxy in the constellation Ursa Major. In a letter written in 1783 to J. Bernoulli, Pierre Méchain (who had shared information about his discoveries with Messier) claimed that M102 was actually an accidental duplication of M101 in the catalog.
Spiral galaxy NGC5477 is to the left.