imaged NGC 246 (Halifax)

The BGO robot imaged NGC 246 for me. A large but very faint planetary nebula in Cetus. One of the RASC Finest NGCs. Also known as Caldwell 56.

Luminance only, 15 seconds subexposures, 20 stacked shots. FITS Liberator, GIMP. North is up; left is east.

Also collected red, green, blue, and ionised oxygen data, 15 seconds each, 20 subs for each channel. The O-III is almost unusable. Will need longer exposures for that filter.

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Noted that SkySafari also refers to this object as the Skull Nebula.

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Gathered more data on 27 Oct '17. All filters...

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Wikipedia link: NGC 246.