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The Sadr Region (also known as IC 1318 or the Gamma Cygni Nebula) is the diffuse emission nebula surrounding Sadr at the center of Cygnus's cross. The Sadr Region is one of the surrounding nebulous regions; others include the Butterfly Nebula and the Crescent Nebula. It contains many dark nebulae in addition to the emission diffuse nebulae.
Gamma Cygni (γ Cygni, abbreviated Gamma Cyg, γ Cyg), officially named Sadr / ˈ s æ d ər /, [11] [12] is a star in the northern constellation of Cygnus, forming the intersection of an asterism of five stars called the Northern Cross.
Gamut of the CIE RGB primaries and location of primaries on the CIE 1931 xy chromaticity diagram The CIE 1931 RGB color matching functions normalized to equal areas under the curves. Multiplying the red and green curves by 72.0962 and 1.3791 respectively yields the actual color matching functions.
Messier 29 can be found quite easily as it is about 1.7 degrees south [c] of Gamma or 37 Cygni (Sadr). Angularly close, and almost certainly nearby in space, is diffuse nebulosity. The especially hot binary Wolf–Rayet star WR 143 (WC4+Be) (HD 195177) can be found near this cluster.
A comparison of the Adobe RGB (1998) color space and sRGB color gamuts space within the CIE 1931 xy chromaticity diagram. The sRGB gamut is lacking in cyan-green hues. sRGB is an RGB color space proposed by HP and Microsoft in 1996 to approximate the color gamut of the (then) most common computer display devices (CRTs). Since sRGB serves as a ...
In GIMP 2.8, the Convert Image to Indexed Colors Option (Image→Mode→Indexed..) allows generation of an optimum palette with a choice in the number of colors from 2 to 256, the option of using a web-optimized palette, using a black and white palette (1 bit) or using a custom palette. It allows unused colors to be removed from the palette and ...
HD 191806 is a star located in the northern constellation Cygnus.With an apparent magnitude of 8.093, it's undetectable with the naked eye, but can be seen with binoculars. HD 191806 is currently placed at a distance of 215 light years based on parallax measurements and is drifting towards the Solar System with a spectroscopic radial velocity of −15.28 km/
Molnar, Lawrence; et al. (4 January 2017). "Prediction of a Red Nova Outburst in KIC 9832227" (PDF). Calvin College (draft ed.). Calvin College Group. Archived from the original (PDF) on 7 January 2017