NGC 4157 - Spiral Galaxy in Ursa Major


NGC 4157 is a spiral galaxy in the constellation of Ursa Major. It is at the border of Canes Venatici. It was discovered by William Herschel in 1788. It lies 55 million light years away and spans 105 thousand light years.




Telescope: 8 in. Astro-Tech R-C @ f/8
Camera: Modified Canon 650D; ISO 3200
Mount: iOptron CEM60
Guiding: QHY-5L-II M on 60mm guide scope

24 @ 5 min.


Images were focused using camera's live view with a Bahtinov mask. The subframes were captured, aligned, and combined with ImagesPlus. The composite image was adjusted in Photoshop. Topaz Detail and DeNoise were applied.


Shot from my backyard observatory in southeastern Minnesota on 5/20/23.

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