Altamore, AldoAldoAltamorePOPPI, FrancescoFrancescoPOPPI2025-03-212025-03-212024978-3-031-48388-2978-3-031-48389-9http://hdl.handle.net/20.500.12386/36925Jesuit astronomers working at the Collegio Romano Observatory have made many contributions in the field of planetary astronomy: De Vico and Dumouchel studied Halley’s comet, while Secchi was a pioneer in cometary spectroscopy, studying the surface of the Moon, Saturn’s shape, and Mars’ surface; he discovered a comet in 1853, and in 1869 he was the first to observe the spectrum of Uranus.STAMPAenBook part10.1007/978-3-031-48389-9_3https://link.springer.com/chapter/10.1007/978-3-031-48389-9_3FIS/05 - ASTRONOMIA E ASTROFISICA