If the standard for discovery is the identification of a specific, now-named class of nebula, which individual holds that distinction?

Answer

Antoine Darquier de Pellepoix

Antoine Darquier de Pellepoix is credited with identifying a specific *class* of nebula—the planetary nebula—with his discovery of M57, whereas Messier was first in documenting a *new* fuzzy object.

If the standard for discovery is the identification of a specific, now-named class of nebula, which individual holds that distinction?
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