Sh 1-89 (PN G089.8-00.6, PK 089-00.1), Planetary Nebula in Cygnus. Taken over several nights in Aug.
and Sept. 2017. Imaged with Starlight Xpress’ SX-825 camera and a Celestron EdgeHD 9.25 at f10, on a
Losmandy G11/Gemini mount. The OIII and H alpha subframes were 20 minutes binned 1x1, while the RGB
subframes were 4 minutes binned 2x2, resulting in the following total exposures (HA+OIII):(R+Ha):
(G+OIII):(B+OIII) (min) = (580+460):(64+580):(64+460):(64+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.