Horsehead & Flame Nebulae in Orion. 29 hours of exposures over five nights 2024-11-19 to 23 under Bortle 7 skies from Austin, Texas. It's possible to subtract the light gradients from images taken under bright city lights, but the shot noise from that sky glow remains. This noise can be removed by increasing the total exposure integration time. This long exposure image demonstrates that you can take high quality broadband images of dim targets from cities with enough total exposure time. Taken with a WO RedCat 250/51mm, Baader SkyGlow UV/IR filter, ASI533 MC camera, ASIAIR Plus controller, AM5N mount.

Horsehead & Flame Nebulae

345 5' exposures stacked and processed in PixInsight with RC-Astro and SetiAstro tools. Final exp and crop in Affinity Photo