Three members of which family, between 1781 and 1850, discovered Uranus, compiled a star catalogue, mapped all the stars in the Northern hemisphere and founded an observatory to map those in the Southern?
Uranus naked eye, but it was never recognised as a planet by ancient observers because of its dimness and slow orbit. Sir William Herschel announced its discovery on 13 March 1781, expanding the known boundaries of the Solar System for the first time in history and making Uranus the first planet discovered with a telescope. Uranus had been observed on many occasions before its recognition as a planet, but it was generally mistaken for a star. Possibly the earliest known observation was by Hipparchos, who in 128 BC might have recorded it as a star for his star catalogue that was
Star catalogue of the south (being compiled from the Bonn observatory), this was then supplemented by the "Südliche Durchmusterung " (SD), which covers stars between declinations −1 and −23 degrees (1886, 120,000 stars). It was further supplemented by the "Cordoba Durchmusterung" (580,000 stars), which began to be compiled at Córdoba, Argentina in 1892 under the initiative of John M. Thome and covers declinations −22 to −90. Lastly, the "Cape Photographic Durchmusterung" (450,000 stars, 1896), compiled at the Cape, South Africa, covers declinations −18 to −90. Astronomers preferentially use the HD designation (see next entry) of a star, as that catalogue also gives