The planetary nebula NGC 2440 has bipolar shells with complex inner structure. The nebula is composed of material cast off by a dying sun-like star as it enters its white dwarf phase of evolution. Dense ridges of material are eroded from the nebula's extremely hot central star showing a surface temperature of about 200,000 kelvins.
The distance to this nebula is about 4,000 light-years from Earth, the nebula spans over a light-year and is energized by ultraviolet light from the central star, apparant size is 78 arc-sec.
Find a high resolution image from the Hubble telescope here.
Ha-OIII-SII-RGB (Ha 6x20m, OIII 7x20m, SII 7x20m, R 4x20m, G 4x20m, B 4x20m) combined with RGB 10x150s each, seeing 0.7-1 arc-sec, north is up
80cm f/7 Astrooptik Keller corrected cassegrain, FLI Proline 16803, Baader Filters, Prompt 7 CTIO Chile
Processing: Johannes Schedler
Standard color palette below in 50/200% size
Hubble NB color palette below in 50/200% size