M101 - The Pinwheel Galaxy
The Pinwheel Galaxy (M101 / NGC 5457) is an Sc-type spiral galaxy in the constellation Ursa Major. This galaxy is located approximately 24 million light years away according to Hubble Telescope observations. More information and additional images of this galaxy can be found at the Messier Index - M101.
The above image was obtained on 24 May 2008 using a William Optics FLT110 4.2" refractor and an SXV-H9 CCD camera. The total exposure length is 68 minutes consisting of 204, 20-second subexposures.
There are numerous small galaxies throughout this image with some highlighted above (PGC 2464645 and PGC 49919). Additionally, M101 has several knots of stars or nebula regions that have their own NGC designations as seen above.
This is a 12.25-minute composite image from 49, 15-second exposures taken on 5 July 1997 through a 16" Newtonian telescope and using a Cookbook CCD camera.
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