Explanation : also known as Crescent Nebula , the nebula of the crescent moon , located in the rich shores of the celestial northern constellation Cygnus at a distance of about 5,000 light years is a cosmic bubble about 25 light-years , created and sculpted by strong winds a massive star on its inside . The composite image resulting from the acquired data in the narrow band , isolating the light coming from the atoms of hydrogen and oxygen excited by stellar wind . The oxygen atoms produce the blue hue that seems to envelop the detailed folds and filaments of hydrogen that is red under the radiation pressure of the strong stellar wind of a Wolf- Rayet star turbulent (WR 136) that expels the equivalent of the mass of the sun every 10,000 years old, finely mottled , like a cosmic lace . Complex structures of the nebula , are probably the result of this strong wind interacting with material ejected in a previous paroxysmal phase . Credit: APOD , NASA.
OTA: Celestron C11 HD Edge f:10
Ossigeno : 50 x 20min : 1000 min (Baader ir/uv cut flt.);
Idrogeno : 50 x 20 : 1000 min; RGB: R 100 min; G (R/B); B: 165 min.
CCD : Starlight Xpress H694 (cooled – 5° C. unb)
Mount: Avalon M-Uno Fast Reverse