description Sharpless 2-68 Overview
Sharpless 2-68, also written Sh 2-68, is an evolved planetary nebula in the constellation Serpens. Its central star's proper motion through the interstellar medium has affected the nebula's expansion and produced an extended tail, giving the object an asymmetric appearance. The object is studied as an example of how a planetary nebula changes when its expanding material interacts with surrounding interstellar gas.
help Sharpless 2-68 FAQ
What is Sharpless 2-68?
Sharpless 2-68, also written Sh 2-68, is an evolved planetary nebula in the constellation Serpens. It formed from material shed by a dying star.
Why does Sharpless 2-68 have an asymmetric shape?
The nebula’s central star is moving through the interstellar medium while the nebula expands. That motion has shaped an extended tail and made the object look uneven.
What type of star is at the center of Sh 2-68?
Sh 2-68 contains the hot remnant central star left after the planetary-nebula phase. Its proper motion is important because it interacts with the surrounding interstellar gas.
How is Sh 2-68 different from a typical round planetary nebula?
Many planetary nebulae appear roughly spherical, but Sh 2-68 has a pronounced asymmetric structure and extended tail. The unusual appearance is linked to the central star’s motion through space.
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