Kohoutek 1-20 (K 1-20, PN G110.6-12.9, PK 110-12.1) Planetary Nebula in Andromeda. Taken Nov. 02, 04,
Dec. 01, 2016 and Oct. 30, 31, Nov. 01, 05, 2018. Imaged with CCD Lab’s Q285M camera for the 2016
data and with Starlight Xpress’ SX-825 camera for the 2018 imaging session, along with a Celestron
EdgeHD 9.25 at f10, on a Losmandy G11/Gemini mount. The H alpha and OIII subframes were 20
minutes each. The Q285M H alpha data was binned 1x1 and 2x2, while the SX825 H alpha and OIII data
was binned 1x1. The RGB subframes were 4 minutes binned 2x2 for both cameras, resulting in the
following total exposures (HA+OIII):(R+Ha):(G+OIII):(B+OIII) (min) = (500+480):(60+500):(60+480):
(60+480). This image is displayed at 0.57 arc-seconds per pixel. Captured with Nebulosity, calibrated
and sigma combined in Iris with other processing using PixInsight LE and Photoshop CS. North is up.