DeLisle Stewart

Stewart (right) at a picknick near Arequipa/Peru


Stewart was born on March 16, 1870. He studied astronomy under William Wallace Payne at Carlton College (Goodsell Observatory), Northfield, Minn. In April 1896 he became a staff member at Harvard College Observatory (under the directorship of Edward Charles Pickering). From 1898-1901 he worked at Harvard's Arequipa station using the 24" f/5.6 Bruce photographic refractor, made by Alvan Clark & Sons and completed in 1893 (later moved to Boyden Station at Bloemfontein, South Africa) . On August 18, 1901 he discovered asteroid (475) Ocllo on a Bruce plate. His observations of nebulae (followed by Royal Frost) using 4 hour-plates were published in the Harv. Ann. 60, 156 (1908). He discovered 672 new objects, included in the IC II (1908). After his time at Arequipa he went to Cincinnati Observatory. But in 1910 Stewart eventually lost his job over his persistent attempt to persuade the observatory to adopt astrophotography. As a consequence he founded a new (amateur) organisation, the Cincinnati Astronomical Society (CAS), being its president till his death on February 2, 1941. In his later years he was specially known as a lecturer in astronomy. In 2000 a new 27" reflector of the CAS was named "DeLisle Stewart-telescope".

Obituary: PASP 53, 139 (1941)


Arequipa Observatory and 24" f/5.6 Bruce-Refractor

Bruce-Refractor at Boyden Sation (Bloemfontein)


Cincinnati Observatory with 12" and 16" Refractors