NGC6888 RGBHOO Newtonian image (Tim Hawkes)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888

NGC6888 RGBHOO Newtonian image, Tim Hawkes

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NGC6888 RGBHOO Newtonian image

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NGC6888 RGBHOO Newtonian image

NGC6888 image taken with an 8 inch Newtonian at F 5.0 under Bortle 6/7 skies . Nearly 3h of RGB exposure under moonless skies using a UHC filter and ASI294 MC PRO camera was combined with an NB image comprising 5.5h of O3 (6 nm filter) and about 2h exposure of HA (7 nm filter) taken using an ASI 294MM PRO mono camera. The starless image was stretched in PI and RGB stars added back at the end (starExterminator 2.05). The NB images were deconvolved using BlurXterminator.

NGC6888 is about 5000 light-years away and located in the constellation Cygnus. The emission nebula arises from the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) catching up with and ionizing the slower moving wind and material that had previously been ejected by the star when it was last in a red giant phase around 250,000 to 400,000 years ago. This collision has resulted in the hot visible ionized shell - the OIII emission from which attests to the high local electron temperature - and also two invisible shock waves, one continuing outward and one reflected back into the star. The latter heats the stellar wind to X-ray-emitting temperatures.

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Astrometry.net job	6883642
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NGC6888 RGBHOO Newtonian image

NGC6888 RGBHOO Newtonian image

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NGC6888 RGBHOO Newtonian image

NGC6888 RGBHOO Newtonian image

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