Dunlop made several noteworthy discoveries in the Southern Hemisphere sky and in 1828 published A Catalogue of Nebulae and Clusters of Stars in the Southern Hemisphere observed in New South Wales, which contains 629 objects.
Am Joer 1828 gouf dann den A Catalogue of Nebulae and Clusters of Stars in the Southern Hemisphere observed in New South Wales publizéiert, dee 629 nei entdeckten niwwleg Objeten opzielt.