The Crescent Nebula is a "small" diffuse nebula located in the constellation Cygnus. It lies about 4700 light-years away and has a size of 16 light years. It is thought to have originated thanks to the star HD 192163, which is housed inside.
But how can a star generate this? HD 192163 is a Wolf-Rayet star. These rare stars are bodies extremely massive and warm. They lose their mass so quickly to generate a "stellar wind" strong enough to detach the outer layers of the star.
The material separated from the worried star travels at high speeds in space (of the order of 2,000 km/s) impacting and exciting (triggering emission phenomena) the interstellar clouds it encounters. Among these interstellar clouds are also the outer layers ejected from the star thousands of years ago when it was a red supergiant.
Some numbers of HD 192163: it has a surface temperature of over 70,000 °C, is bright more than 200,000 times our Sun and 15 times more massive. Despite its "young" age (4.5 million years) is already at an advanced stage of his life due to its restless activity.
Alessio Vaccaro - BlueJourney Team
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Photos were acquired with EOS Utility and PHD Guiding. Calibration and stacking with MaximDL. Deconvolution made with MaximDL and post processing with PixInsight LE and Photoshop.
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