NGC2440 is a tiny planetary in Puppis. It appears about 74" x 42". In one orientation is appears like a bow tie. The central star is a white dwarf with a surface temperature of around 200,000 kelvin.
This image is composed of Ha OIII LRGB with 14 hours of integration time.
There appears to be a faint halo around the object, which could be of further interest with a longer focal length / greater image scale.
Click here for larger resolution image.