The astronomers William Herschel and his son John produced a vast body of astronomical observations. William, who was famous for his reflecting telescope, as well as his discovery of the plant Uranus, had already published a Catalogue of Nebulae and Clusters of Stars in 1786, with the assistance of his sister Caroline. By 1864, his work had been extensively added to by his son John, who therefore published an expanded General Catalogue of Nebulae and Clusters While the first edition of William's Catalogue had included 1000 entries, John's 1864 version featured more than 5000.
Editors. "Herschel's General Catalogue of stars and nebulae". The Literary Encyclopedia. First published 30 August 2013; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=6329, accessed 27 April 2015.]