Abell 18 (PN A66 18, PK 216-00.1, PN G216.0-00.2) Planetary Nebula in Monoceros. Taken Feb. 05, 10,
11, 22 and March 11, 2019. Imaged with Starlight Xpress’ SX-825 camera and a Celestron EdgeHD 9.25 at
f10, on a Losmandy G11/Gemini mount. The H alpha and OIII subframes were 20 minutes binned 1x1,
while the RGB subframes were 4 minutes binned 2x2, resulting in the following total exposures L:R:G:B
= (HA+OIII):(R+Ha):(G+OIII):(B+OIII) (min) = (480+460):(44+480):(44+460):(44+460). This image is
displayed at 0.57 arc-seconds per pixel. Captured with Nebulosity, calibrated, sigma combined in
Iris with other processing using PixInsight LE and Photoshop CS. North is up.