Abell (A66 3, PK 131+02.1, PN G131.5+02.6, SH 2-189) Planetary Nebula in Casseopeia. Taken over
several nights in Nov. and Dec. 2018. 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) = (660+460):(56+660):(56+460):(56+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.