Is there an atmosphere on Sedna?

Answer 1

Due its distance, it is not known for sure if Sedna does have an atmosphere. Scientists have speculated that a tenuous atmosphere may exist for some of its orbit, from the Nitrogen that is present.

Answer 2

Sedna is a small, icy world located in the outer solar system, and it is believed to have a very thin and sparse atmosphere composed mostly of methane. However, because of its distance from the sun and extreme cold temperatures, this atmosphere is likely very tenuous and not comparable to the atmospheres of planets like Earth.