About image
NGC 6888 (also known as Crescent Nebula) is a diffuse nebula visible in the southern part of the Swan constellation.
The cloud shines with reflection, following the energy received during the explosion of a supernova.
Within a few millennia, the object is expected to vanish completely, dispersing in the interstellar medium. The nebula gas appears to be centered on a Wolf-Rayet star (HD 192163), which is now inside it; this star would also be responsible for the nebula, which would constitute the material of the outer layers of the expelled star, which would then collide with other nebulae thus creating the shape we currently observe.

Technical data
Optic            Tecnosky Apo Refractor 115 - 800mm f/6.9
Mount          Losmandy G11 with Ovision worm and FS2
Camera           Atik 4000 with Starlight Xpress filter wheel 5 positions
Filters        Baader Ha 7nm and OIII 8.5nm, 50.8 unmounted
Guiding system      TSOAG 9mm with Lodestar
Exposure details    Ha 14x900" bin1 -10C
                                      OIII 13x900" bin1 -10C
Total integration    6.8h
Acquisition       Maxim, PHD2
Processing       Maxim, Photoshop CS5
SQM-L        18.4    
Location        Home terrace (Rescaldina, Italy)
Date           14/15 July 2013