NGC 7000 in H-alpha, [S II] and [O III] ======================================= Telescope: Takahashi FSQ-106-ED Camera: Apogee U9000 Filter: H-alpha, [S II] and [O III] narrowband Location: Moore Observatory Observer: Jeremy Huber Exposures: H-alpha 17600 seconds (image data compiled on 2010-09-03) [O III] 3816 seconds (image data compiled on 2015-03-17) [S II] 4935 seconds (image data compiled on 2015-03-17) Software: Swarp for combining images to produce the mosaic and custom Python code for processing Color image composite by J. Kielkopf Red: H alpha Green: [S II] Blue: [O III] Images scaled to square root of flux and displayed as 0.5:1:1 to enhance the visibility of the [S II] and [O III] The png image is from ds9 with the rgb option.