| Gamma Cygni Nebula in Cygnus Parts A & B | |||||||||||||||
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| Description: Image Data Telescope: Astrotech 111mm @ f/7 CCD: QHY10 CCD Camera Mount: Skywatcher AZ-EQ6 SynScan GPS Image: 12 x 20 min, 4 Hours Guider: Orion 80mm f/5, QHY5L Location: Mt. Pinos, Ca. Date:8/11/2013 Captured with Nebulosity 3 Guided with PHD Pre-processing: DeepSky Stacker Final Processing: Photoshop CS5 Curves, Levels, Star Masking, Contrast Boost 9 BIAS & 9 FLATS APPLIED Gamma Cygni (γ Cyg, γ Cygni) is the Bayer designation for a star in the northern constellation Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. It has the traditional name Sadr (also spelled Sadir or Sador), which name comes from the Arabic word صدر şadr, "chest", the same word which gave rise to the star Schedar (Alpha Cassiopeia). In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Sadr al Dedjadjet, (صدرألدجاجة-şadr aldajaaja), which was translated into Latin as Pectus Gallinǣ, meaning the hen's chest. With an apparent visual magnitude of 2.23, this is among the brighter stars visible in the night sky. Parallax measurements give a distance estimate of 1,800 light years (560 parsecs), with a 15% margin of error. The stellar classification of this star is F8 Iab, indicating that it has reached the supergiant stage of its stellar evolution. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. Stats: Views: 1792 Total Favorities: 0 View Who Favorited Filesize: 1.04MB Height: 1206 Width: 1800 Posted by: TT (wasPW)  November 05, 2014, 07:57:28 AMRating: Has not been rated yet. Total Likes: 0
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