Sh 2-115

Sh 2-115 is an emission nebula and H II region in the constellation of Cygnus, catalogued by Stewart Sharpless in his 1959 second edition of H II regions visible from the northern hemisphere. It lies approximately 2–2.5° northwest of the bright star Deneb (α Cygni) and is part of the extensive star-forming complexes in the Orion Arm of the Milky Way.^[2][3][4][5]

Right ascension20^h 35^m 2.00^s

Declination+47° 02′ 24.0″

Distance3000 ± 600 pc

ConstellationCygnus

Quick facts Nebula, Observation data: epoch ...

Sharpless 2-115

Nebula
Image of Sh 2-115 Nebula
Observation data: epoch
Right ascension	20h 35m 2.00s
Declination	+47° 02′ 24.0″
Distance	3000 ± 600 pc
Constellation	Cygnus
Designations	Sh 2-115, LBN 357, 3C 416.1[1]
See also: Lists of nebulae

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The primary source ionizing the nebula is the open cluster named Berkeley 90^[6] located in the eastern part of the nebula, and the star responsible for ionization is O-type star LS III +46 12 (O4.5IV(f)). Three other stars named DM 46 2972 (O9.5 V), DM 46 2978 (B0III) and LS III 46 12 (O6) are also suspected to be involved in the ionization.^{[7][2][1][8][9]}