NGC 2440 is an old planetary nebula, .
Its central star, HD 62166, is possibly the hottest known white dwarf, about 400,000°F(200,000°C).
The nebula is situated in the constellation Puppis.

It was discovered by William Herschel on March 4, 1790.
He described it as "a beautiful planetary nebula of a considerable degree of brightness, not very well defined."
The nebula is located about 4,000 light years from the Sun.(wiki)

I did 2 versions:
A 'normal' RGB seen here
And an enhanced RGB with additional Ha data - seen in the next image.

L-RGB image:
Luminance - 1 hr
RGB 30 min each

Total of 2.5 hrs

Telescope: ASA600 24" RC with Reducer at f4.5
Mount: ASA DDM200 Direct Drive with Absolute Encoders
Camera: Moravian G3 61000 pro

Imaged from Tivoli farm, Namibia