The clamshell nebula

Image Description and Details : The clamshell nebula in Cygnus Sh2-119 Is a large complex of emission nebulae in the constellation Cygnus. The bright star at the center is 68 Cygni, a 5th magnitude star responsible for ionizing the surrounding gas. Estimated tonbe 2200 light-years from Earth. This image is the result of 4 night during which I collected 24h of data Using ultranarrowband filter From bortle 9 backyard 96 x 300sec exposure for each filter Gain 121 tenp. -5°C 40 dark calibration files 20 flat calibration file per filter per session

Copyright: Riccardo pacini