description Lambda Orionis Ring (Sh2-264) Overview
The Lambda Orionis Ring, also catalogued as Sharpless 2-264, is a large emission nebula and H II region in Orion. It surrounds the star Lambda Orionis, also called Meissa, whose ultraviolet radiation ionizes nearby hydrogen gas. Stellar winds from the central O-type star and the surrounding stellar association have helped shape the ring-like structure, making it a useful region for studying massive-star feedback.
help Lambda Orionis Ring (Sh2-264) FAQ
What is the Lambda Orionis Ring?
The Lambda Orionis Ring is a large emission nebula and H II region in Orion. It surrounds Lambda Orionis, also known as Meissa.
What does Meissa do in the nebula?
Meissa's ultraviolet radiation ionizes nearby hydrogen gas, which makes the region an H II region. The central star is also an O-type star whose stellar wind helps shape the surrounding nebula.
Why is it called a ring?
The nebula forms a large ring-like structure around Lambda Orionis rather than appearing as an isolated compact cloud. Its catalog designation is Sharpless 2-264, or Sh2-264.
Is Sh2-264 a reflection nebula or an emission nebula?
It is described as an emission nebula and H II region in Orion. Its glow comes from hydrogen gas ionized by ultraviolet radiation from Meissa, the central O-type star.
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Similar to Lambda Orionis Ring (Sh2-264)
compare_arrows Compare: Sh2-261 (Lower's Nebula) See all arrow_forward
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