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M101 / Pinwheel Galaxy

Classification: Mag 7.5 Spiral Galaxy M101/102, NGC 5457
Constellation: Ursa Major (UMA)
Object Location: Ra 14h 04m 07s Dec +54° 13’54” (current)
Size & Distance: 28.8 x 26.9 Apx 21 Million light-years.

Date & Location: 04-5/6-2024 Little Blair Valley, CA
Exposure: HaLRGB 60,160,80,75,95. Ha-6x10, L-16x10, R-10x5/2x10, G-9x5/3x10, B-11x5/3x10. (bin 1x1)
Optics: Telescope Engineering Company APO110FL w/ TEC FF @ f/5.74, 631mm, FLI-Atlas focuser.
Mount: Astro-Physics Mach 1 GTOCP4 / ATS 8x36 Pier.
Camera: FLI-MLx694 @-25c / FLI CFW2-7 / Guided by ZWO 174mini / w OAG.
Filters: Chroma 50mm 3mn Ha, LRGB
Software: MaxImDL 6.11, Photoshop CC, CCDStack Topaz Studio.

Notes: Sky conditions: Above average seeing, No wind, Temp mid 50’s to mid 30’s
Image Field of view is 48.5x48.5arcmin. Image Scale 1.48 arcsec/pix

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 top right.