description Sharpless 2-216 Overview
Sharpless 2-216 (Sh2-216) is a large, ancient planetary nebula located in the constellation Perseus. At an estimated distance of roughly 420 light-years, it is among the nearest known planetary nebulae to Earth. Its advanced age—estimated at over half a million years—means the nebula has expanded to a very large angular diameter and has a low surface brightness, making detailed observation challenging despite its proximity.
help Sharpless 2-216 FAQ
What is Sharpless 2-216?
Sharpless 2-216, often written Sh2-216, is a very large planetary nebula in the constellation Perseus. It formed when a dying star shed its outer layers.
How far away is Sharpless 2-216?
Sh2-216 is estimated to be roughly 420 light-years from Earth. That makes it one of the nearest known planetary nebulae.
Why is Sharpless 2-216 difficult to see?
The nebula is extremely old and its gas has expanded and become faint over time. Its large, diffuse structure has much lower surface brightness than a compact, bright planetary nebula.
How old is Sharpless 2-216?
Its visible nebular material is estimated to be more than half a million years old. That advanced age helps explain why Sh2-216 is broad, faint, and highly evolved.
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