M101: The Pinwheel Galaxy

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M101, the Pinwheel Galaxy in the constellation Ursa Major (the Big Dipper). This is a face-on spiral galaxy, prominantly displaying its asymmetric spiral structure. It lies approximately 27 million light years away, and is nearly twice the size of our own galaxy.

 Optics:8-inch Ritchey-Chretien telescope 
Camera:QHY268M CMOS camera 
Exposure info:LRGB 68/20/20/29 x 300 secs 
Filters used:Astronomik LRGB and Optolong L-Pro light pollution filter 
date:June 2022 
Processing:Pixinsight-->Photoshop-->Topaz deNoise AI-->Lightroom; re-processed January 2024 

An earlier version of this galaxy using a DSLR and a telephoto camera lens:

 Optics:Canon 500mm lens + 1.4x teleconverter 
Camera:astro-modified Canon T5i 
Exposure info:111 x 120-180 secs, iso 800, f/5.6 and f/8 
Filters used:none 
date:April-May, 2015