NGC 6888 – The Crescent Nebula
NGC 6888, the Crescent nebula is located in the constellation Cygnus about 5,000 light years away. It comes from a rapid stellar wind created by the central star which is hot and massive and will enter the last stage of its life. It will probably eventually end up as a supernova in less than a million years. This stellar wind is ionized by the star’s intense ultraviolet radiation. The stellar matter making up the envelope was ejected about 400,000 years ago.
Telescope: Celestron Edge HD14 with 0.7x focal reducer
Mount: Paramount MX+
Camera: ZWO ASI 1600MM
Filters Astrodon LRGB filters and ZWO narrowband filters (1.25″)
Exposure: 55 x 6 minutes with LRGB and 20 x 10 minutes with H-Alpha (assigned to red), and Oxygen III (assigned to green and blue).