Astronomy | astro_images | Abell21_LRGB+Ha0
Abell 21, the "Medusa" nebula in Gemini
2 nights from CA in 2017 + 7 nights from New Mexico in January-February 2024 using CDK 12.5" scope and QSI-640ws camera at f/8, 32.6 hours Ha+Oiii+LRGB
