Pigatto, LuisaLuisaPigattoZANINI, ValeriaValeriaZANINI0000-0001-5258-99942024-02-062024-02-0620021440-2807http://hdl.handle.net/20.500.12386/34716In 1898 a new asteroid, 433 Eros, was discovered. As the opposition of 1900 October 30 would bring this asteroid very close to Earth, the Comité International Permanent pour l'Exécution Photographique de La Carte du Ciel instituted a special temporary Commission with the task of co-ordinating micrometric, heliometric, and photographic observations from different places on Earth, in order to determine the solar parallax. Fifty-one astronomical observatories, including the Italian Observatories of Arcetri, Padova, and Teramo, took part in this project with visual and photographic opbservations. Antonio Maria Antoniazzi, astronomer at the Padova Observatory, observed the new asteroid from 1900 October to 1901 February, The 122 observations made in Padova from October to December formed part of the data set used by Arthur Hinks of the Cambridge Observatory, who had the task of reducing all of the observations. In addition to discussing the final outcome of the 1900-1 programme, this paper briefly examines the solar parallax investigations associated with the Eros opposition of 1930-1.STAMPAenArticlehttps://ui.adsabs.harvard.edu/abs/2002JAHH....5..141P2002JAHH....5..141PFIS/08 - DIDATTICA E STORIA DELLA FISICA