Starry Vistas by Don J. McCrady
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M46, M47, and NGC 2423

(with planetary nebula NGC 2438)

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M46 is the dense cluster at the bottom right, which contains the little planetary nebula NGC 2438.  The planetary nebula is not actually part of the open cluster, just a chance alignment of two unrelated objects.

M47 is the bright, but loose open cluster near the top center.

NGC 2423 is the dimmer, loose, open cluster near the left-center.