Herschel published his discoveries as three catalogues: "Catalogue of One Thousand New Nebulae and Clusters of Stars" (1786), "Catalogue of a Second Thousand New Nebulae and Clusters of Stars" (1789) and the previously cited "Catalogue of 500 New Nebulae ..." (1802). He arranged his discoveries under eight "classes": (I) bright nebulae, (II) faint nebulae, (III) very faint nebulae, (IV) planetary nebulae, (V) very large nebulae, (VI) very compressed and rich clusters of stars, (VII) compressed clusters of small and large and bright stars, and (VIII) coarsely scattered clusters of stars. Herschel's discoveries were supplemented by those of Caroline Herschel (11 objects) and his son John Herschel (1754 objects) and published by him as "General Catalogue of Nebulae and Clusters" in 1864. This catalogue was later edited by John Dreyer, supplemented with discoveries by many other 19th-century astronomers, and published in 1888 as the "New General Catalogue" (abbreviated NGC) of 7,840 deep-sky objects. The NGC numbering is still the most commonly used identifying label for these celestial landmarks.