Location / Date

Zellerndorf, June, July und August 2012

Telescope / Mount / Guiding

10" f4,7 Skywatcher Newtonian, Skywatcher NEQ6, ASA Quattro 2" Coma Corrector, ASA OAG + Mgen

Camera / Exposure

Canon EOS 500Da
37 x 15min ISO 200 (total 12h 20min)
16 x 30min ISO 200 with Astronomik 12 nm Hα Clipfilter (total 8 h)

Processing

Theli, Fitswork, PixInsight, Photoshop

Notes

The Ring Nebula (also catalogued as Messier 57, M57 or NGC 6720) is a planetary nebula in the northern constellation of Lyra. Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star, which was passing through the last stage in its evolution before becoming a white dwarf.