description NGC 2438 Overview
NGC 2438 is a planetary nebula in the constellation Puppis that appears within the boundaries of the open cluster Messier 46 when viewed from Earth. Measurements of its motion and distance indicate that the nebula is not physically associated with the cluster, making the pairing a line-of-sight coincidence. Its expanding shell was expelled by a dying low- or intermediate-mass star whose hot remnant illuminates the gas.
help NGC 2438 FAQ
Where is NGC 2438 located?
NGC 2438 is a planetary nebula in the constellation Puppis. In the sky it appears within the boundaries of the open cluster Messier 46.
Is NGC 2438 physically part of Messier 46?
No. Measurements of its motion and distance indicate that NGC 2438 is not physically associated with Messier 46.
Why do NGC 2438 and Messier 46 look connected?
They overlap from Earth's line of sight, so the nebula appears projected against the cluster. This is a chance alignment rather than evidence that both objects formed together.
What type of object is NGC 2438?
NGC 2438 is a planetary nebula created from material expelled by a dying star. The word planetary describes its historical appearance in small telescopes, not a relationship with planets.
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