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In 1890, he founded his observatory, which he named "Collurania", equipping it with a 40 cm Cooke refractor, which he had purchased for £2000 (£210,652 at the 2020 equivalent) from the son of British Astronomer, James Wigglesworth (born, Wibsey 1815) and which had been situated in Scarborough, before being dismantled and moved to Teramo. He also observed Mars and developed the theory that the Martian canals were not real but an optical illusion, a theory that was later confirmed.
He discovered one asteroid, 704 Interamnia, which is named after the Latin name for Teramo, and is notable for its relatively large diameter of approximately 350 km, which makes it the fifth largest body in the traditional asteroid belt.
Cerulli was a corresponding member of the Lincei Academy, Rome; the Pontaniana Academy, Naples; and the Academy of Sciences, Turin. He contributed the article on Lorenzo Respighi to the Catholic Encyclopedia.
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