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The Sadr Region (also known as IC 1318 or the Gamma Cygni Nebula) is the diffuse
Butterfly Nebula in narrow band Sulfur, Hydrogen and Oxygen Stephan Hamel.jpg, Butterfly Nebula in narrow band image SHO (north is approximately to the left)
Sadr JeffJohnson.jpg, Amateur image of
emission nebula
An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy ultraviolet photons emitted from a nearby hot star. Among the several different types of emissio ...
surrounding Sadr (γ Cygni
Gamma Cygni (γ Cygni, abbreviated Gamma Cyg, γ Cyg), officially named Sadr , is a star in the northern constellation of Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. Based upon parallax ...
) at the center of Cygnus's cross. The Sadr Region is one of the surrounding nebulous
''Nebulous'' is a post-apocalyptic science fiction comedy radio show written by Graham Duff and produced by Ted Dowd from Baby Cow Productions; it is directed by Nicholas Briggs. The series premiered in the United Kingdom on BBC Radio 4. Set ...
regions; others include the Butterfly Nebula and the Crescent Nebula
The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. It is formed by the fast stellar ...
. It contains many dark nebula
A dark nebula or absorption nebula is a type of interstellar cloud, particularly molecular clouds, that is so dense that it obscures the visible wavelengths of light from objects behind it, such as background stars and emission or reflection nebu ...
e in addition to the emission diffuse nebula
A nebula ('cloud' or 'fog' in Latin; pl. nebulae, nebulæ or nebulas) is a distinct luminescent part of interstellar medium, which can consist of ionized, neutral or molecular hydrogen and also cosmic dust. Nebulae are often star-forming region ...
e.
Sadr itself has approximately a magnitude of 2.2. The nebulous regions around the region are also fairly bright.
Image gallery
Sadr
The Sahrawi Arab Democratic Republic (; SADR; also romanized with Saharawi; ar, الجمهورية العربية الصحراوية الديمقراطية ' es, República Árabe Saharaui Democrática), also known as Western Sahara, is a ...
(center star) surrounded by IC 1318.
See also
*NGC 6910
NGC 6910 is an open cluster in the constellation Cygnus. It was discovered by William Herschel on October 17, 1786. The cluster was also observed by John Herschel on September 18, 1828. It is a poor cluster with prominent central concentration a ...
References
*http://stars.astro.illinois.edu/sow/sadr.html H II regions Cygnus (constellation) IC objects {{nebula-stub