The Sadr Region (also known as IC 1318 or the Gamma Cygni Nebula) is the diffuse

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 emission n ...

surrounding Sadr (

γ Cygni Gamma Cygni is a star in the northern constellation of Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. It is officially named Sadr , gamma Cygni is its Bayer designation, which that is Latiniz ...

) 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 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 ...

e in addition to the emission diffuse nebulae. Sadr itself has approximately a magnitude of 2.2. The nebulous regions around the region are also fairly bright.

Image gallery

SRG-eROSITA all-sky image.jpg, On the left image side are the bright North America Nebula (left bright part) with Sadr region (right bright part) in the

Cygnus X Cygnus X may refer to: * Cygnus-X (star complex), a giant star formation region * Cygnus X (music group) See also

* Cygnus X-1 (disambiguation) * Cygnus X-3 {{Dab ...

region, visually interrupted by the Cygnus rift, of the constellation Cygnus, in this X-ray image. 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

Sadr The Sahrawi Arab Democratic Republic (SADR), also known as the Sahrawi Republic and Western Sahara, is a partially recognized state in the western Maghreb, which claims the non-self-governing territory of Western Sahara, but controls only ...

(center star) surrounded by IC 1318. IC1318 by Kasra Karimi

References

*http://stars.astro.illinois.edu/sow/sadr.html H II regions Cygnus (constellation) IC objects {{nebula-stub