description NGC 7139 Overview
NGC 7139 is a faint planetary nebula in the constellation Cepheus. It has a roughly circular appearance and a low surface brightness, making it more difficult to observe than compact, brighter planetary nebulae. The nebula lies approximately 3,300 light-years from the Sun and represents the expelled outer layers of a star that has reached a late stage of stellar evolution.
help NGC 7139 FAQ
Where is NGC 7139 located?
NGC 7139 is a planetary nebula in the constellation Cepheus. It has a roughly circular shape and a faint, diffuse appearance.
How far away is NGC 7139?
NGC 7139 lies approximately 3,300 light-years from the Sun. The figure is an approximate astronomical distance rather than a direct everyday measurement.
Why is NGC 7139 difficult to observe?
Its low surface brightness spreads the nebula's light over a relatively large area. Dark skies, careful star-hopping, and averted vision can be important for detecting it.
What type of object is NGC 7139?
It is a planetary nebula, not a planet or a galaxy. The object consists of gas released by a star near the end of its life and illuminated by the remaining stellar core.
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