A Face-On Spiral Galaxy in Ursa Major

Posted by Steve Pastor
on Friday, July 24, 2020
Messier 101 is a spiral galaxy found in the constellation Ursa Major. The spiral arms contain many bluish knots, which are designated by their own NGC numbers, and red HII regions. The image is a total of 10 hrs exposure taken with a 12.5” RCOS f/9 operating at f/6 (Astro-Physics TCC67) with an SBIG STF8300m CCD camera mounted on a Paramount ME in Mayhill, NM on the nights of 29 March, 3, 29 May 2019; 15, 23, 24, 26 April 2020 (18 x 1200 sec Lum; 4 x 1200 sec R; 4 x 1200 sec G; 4 x 1200 sec B; all at -15 degrees C). Processed in PixInsight 1.8.8-5 Ripley (x64).
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