Which nebula's discovery is specifically highlighted as the first instance of a *planetary nebula* being recognized as such?

Answer

M57, the Ring Nebula

The Ring Nebula (M57), found by Antoine Darquier de Pellepoix in 1779, is frequently highlighted because it was the first recognized planetary nebula, representing a shell of gas ejected by a dying central star.

Which nebula's discovery is specifically highlighted as the first instance of a *planetary nebula* being recognized as such?
HistorydiscoverySpaceastronomyfirstnebula