description Lambda Orionis Nebula Overview
The Lambda Orionis Nebula, catalogued as Sh2-264, is a large H II region in the constellation Orion and part of the Lambda Orionis star-forming complex. It surrounds the hot star Lambda Orionis, traditionally named Meissa, whose ultraviolet radiation ionizes the region's hydrogen gas. Its broad, roughly ring-shaped structure makes it primarily an object for wide-field imaging and observation rather than narrow-field viewing.
help Lambda Orionis Nebula FAQ
What is the Lambda Orionis Nebula's catalog number?
The Lambda Orionis Nebula is catalogued as Sh2-264, a large H II region in Orion. It belongs to the broader Lambda Orionis star-forming complex surrounding the star Meissa.
What star powers the Lambda Orionis Nebula?
The hot star Lambda Orionis, traditionally called Meissa, supplies ultraviolet radiation that ionizes the surrounding hydrogen. That ionization is why the cloud is classified as an H II region rather than just a dark dust cloud.
Where is Sh2-264 in Orion?
It lies around Meissa in the head area of the constellation Orion, near the famous Belt. It is a different object from the bright Orion Nebula, Messier 42, even though both are star-forming nebular regions.
Why is the Lambda Orionis Nebula called the Angelfish Nebula?
Long-exposure images show a broad, curved nebular shape that resembles an angelfish, which is the source of the nickname. The scientific designation remains Sh2-264, and Meissa is the key star to use when locating it.
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