NGC 2818
作者:Bob Hegwood
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NGC 2818 is a planetary nebula located 10,400 light-years away in the southern constellation Pyxis. It is often cited as a member of the open cluster NGC 2818A framing it, however, radial velocity differences between the planetary nebula and open cluster suggest a chance alignment. The case is an example of a superimposed pair, similar to NGC 2438 and Messier 46
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