This is a four-panel mosaic of SNRG65.3+5.7 in HOO with RGB stars. It is a vast but very faint supernova remnant located in the constellation Cygnus. It has low surface brightness against a crowded star field. First identified in 1977, portions of the remnant had earlier been listed as Sh2-91, Sh2-94, and Sh2-96. Spanning roughly 230 light-years in diameter and estimated to be around 27,500 years old, it rivals the Veil Nebula in apparent size but is far more difficult to observe due to its faintness. I captured around 169 hours of data across four panels from May to Sept, 2025 from my backyard.
Dates: May-Sept 2025
Telescope: Askar FRA300 pro
Mount: ZWO AM3
Camera: ZWO2600MM Pro
Filters: Antlia 2.5nm Ha, O3 and ZWO R, G, B
Acquisition: 
    Ha: 86h20m
    O3: 77h
    RGB: 6h
Total Integration: 169h20m