M27 Dumbbell Nebula in narrow band color
Date: 6, 17 and 18 July 2003
Telescope: Celestron 8” SCT with stabilized mirror, on Gemini G-41 mount
Guiding: ST-4 Autoguider with Celestron C80, 80mm F11 refractor piggybacked on C8.
Luminence: IDAS LPS filter 13x5mins
Red: Schuler H-alpha filter 10x10mins
Green and Blue: Lumicon O-III filter 7x10mins (I’ve tried Lumicon H-beta for blue, but too few nebulosity was recorded)
So the LRGB channels are LHOO colors
Location: Tai Mei Tuk, Hong Kong
Software: Image acquisition by Astroart, calibration and auto-alignment by AIP4win, sigma-combined by Sigma, R-L deconvolution by AIP4win, final brightness adjustment by Astroart.
This is the same data using H-alpha for Luminence instead, so this is HHOO colors!