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SBIG ST-4K with C14 at f/7, 1500s total exposure 10/04/24 Lake San Antonio, CA

Known as the "Skull Nebula", NGC 246 is a diffuse planetary nebula in Cetus. The color of the blue central star can be seen in the second image, which is scaled to avoid saturating the color. Although the resolution is not great in this image, the nonlinearly scaled image on the right also shows a white-colored star just next to the blue central star. Clouds were present during this exposure sequence, and at least one of the frames used in the image stacking had reduced transmission and increased background.

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Starshoot DSCI with 8″ f/6 Newtonian, 142 exposures, 10s each 9/18/09 Lake San Antonio, CA

This is another planetary I had not seen before, in Cetus. It is faint but has interesting structure. The (very hot) central star has a distinct blue color, as seen in the right-most image.