9/9/2007 2-4 AM Latitude: 43° 48.407′ N Longitude: 122° 43.528′ West 3252 feet; June Mountain 22 miles, South of Dexter. OR. Seeing: E, Transparency : 7 Bortle: 2, SQM:21.91 Telescopes / Optics: TEC 140mm f/7 980mm Mount: Astrophysics AP1200 GOTO Camera: SBIG ST8xme CCD & CFW9 FOV: 0.81º x 0.54º FOV: 28’ 48”’ x 19’12” FWHM: 3.95” Filter: Astrodon LRGB series E Gen. 2 (Ha 9nm Schuler. Information: NGC 6888 (Crescent Nebula) Captured with CCDSoft. LRGB=3 x 300 seconds; Ha (9nm)= 3 x 600 seconds -20°c. Total L (Ha) RGB= 90 minutes Processed with CCDStack2 and Photoshop CS6
NGC 6888 called The Crescent Nebula, also known as Caldwell 27 and Sharpless 105. It lies within the constellation of Cygnus, approximately 5,000 light years away. NGC 688 shines at an apparent magnitude +7.4 and 18’ x 12’ in size. It is formed by stellar wind from the bright star HD 192163 colliding with slower ejected wind when it became a Red giant approximately 300,000 years ago. HD192163 is the center bright star also called a Wolf-Ravet star (WR 136). This star now sheds the Sun’s mass every 10,000 years. Burning fuel at a fast rate and nearing it’s end. This star will go supernova.