description Sh2-126 Overview
Sh2-126 is a large, faint emission-nebula complex in the constellation Lacerta and is catalogued in Stewart Sharpless's second catalogue of H II regions. Its hydrogen gas is ionized chiefly by ultraviolet radiation from 10 Lacertae, an O-type star associated with the Lacerta OB1 stellar group. Because the nebula covers a broad area of sky and has low surface brightness, it is principally a target for wide-field, long-exposure astrophotography.
help Sh2-126 FAQ
What is Sh2-126, and where is it located?
Sh2-126 is a large, faint emission-nebula complex in the constellation Lacerta. It appears in Stewart Sharpless's second catalogue of H II regions.
What powers the glow of Sh2-126?
Ultraviolet radiation from 10 Lacertae ionizes much of the hydrogen gas in the nebula. 10 Lacertae is an O-type star associated with the Lacerta OB1 association.
Why is Sh2-126 difficult to see?
Sh2-126 has a very low surface brightness, so it is much harder to observe than bright nebulae such as the Orion Nebula. Dark skies, a large telescope, and often an H-alpha filter are useful.
Is Sh2-126 part of the Milky Way?
Yes, Sh2-126 is a Galactic emission nebula in the Milky Way. Its relationship with 10 Lacertae and Lacerta OB1 places it in a region of active massive-star formation.
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