description Sh2-119 Overview
Sh2-119, also known as the Clamshell Nebula, is an H II region in the constellation Cygnus. It surrounds the O-type star 68 Cygni and forms a ring-shaped Strömgren sphere, created by the star's intense ultraviolet radiation ionizing the surrounding hydrogen gas. The nebula is listed in the Sharpless catalog of emission nebulae and is located approximately 5,000 light-years from Earth. It is often observed by amateur astronomers using narrowband filters.
help Sh2-119 FAQ
What is Sh2-119, and why is it called the Clamshell Nebula?
Sh2-119 is an H II emission region in Cygnus, also called the Clamshell Nebula. Its curved, ring-like form surrounds the O-type star 68 Cygni.
What powers the glow of Sh2-119?
The intense ultraviolet radiation from 68 Cygni ionizes nearby hydrogen gas. That process produces the nebula’s visible emission and helps create its Strömgren-sphere structure.
Is Sh2-119 the same object as the North America Nebula?
No. Sh2-119 lies in Cygnus near the North America Nebula, but it is a separate H II region surrounding 68 Cygni.
What kind of telescope is useful for viewing Sh2-119?
Sh2-119 is a large, faint emission nebula, so astrophotographers often use hydrogen-alpha or narrowband filters. A telescope with a wide field of view is helpful because the object spans a broad area of Cygnus.
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