The Rosette Nebula.
The Rosette Nebula spans a distance of about 100 lightyears across and is located 5,000 lightyears from Earth in the Monoceros constellation.
William Optics 61mm Zenithstar, ZWO Duo Band filter, ZWO ASI183MC camera, 25x5 min lights with darks. Processed in DSS, PixInsight and Topaz Denoise.