Field of about 13’x10’ centered on the planetary nebula Messier 57 (incl. the spiral galaxy IC1296). Combination of 9x300 s exposures in Halpha and 9x300 s in [OIII] with the ASI461MM Pro. The red artefacts around bright stars are internal reflections due to the Halpha filter (655/16) used.
Credits: Javier Flores/CAHA/UNIR.