NGC 4157 – Spiral Galaxy in Ursa Major

  • Description: - 11.4th magnitude Spiral Galaxy in Ursa Major, about 61 million light years away. Imaged from Bortle 9 Calgary AB Canada in Luminance only. Imaged over 2 nights.

  • Camera: ASI533M

  • Filter: Chroma Luminance

  • Scope: Astro-Physics AP130EDT, 1085mm at f/8.35

  • Exposure: 29 x 5 minutes for 2.5hrs total

  • Date: 2026-04-17 and 2026-04-18

  • Processed in Pixinsight with RCAstro Tools

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