Technical details: Location / Date: Outside of Kopparberg, Västmanland, Sweden / 2018-March Optics: Orion Optics UK AG12 Mount: 10 Micron GM1000 HPS (Unguided) Camera: Atik One 6.0 with Astrodon 1,25" L-RGB Gen 2 E-Series Filterset Exposure: L:49 x 240s, R: 11 x 240s, G:15 x 240s, B:17 x 240s (cumulative exposure time is 6 hours and 4 minutes) Processing: Pixinsight and Photoshop   Image details: The Whirlpool Galaxy, also known as Messier 51a, M51a, and NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy. Its distance is estimated to be between 15 and 35 million light-years. (Information from Wikipedia)