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.
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
Location Home terrace (Rescaldina, Italy)
Date 14/15 July 2013