Career
He lives in Gnosca, in the Italian-speaking part of Switzerland in the Ticino Alps, where the Osservatorio Astronomico di Gnosca (Gnosca Observatory) is located. Sposetti took images of the Aten asteroid 2004 Fachhochschule which made a close (closer than the moon) flyby of planet Earth. In addition, he detects the optical counterparts of gamma-ray bursts and conducts transit photometry on exoplanets at his observatory.
As of September 1, 2015, Sposetti"s discoveries include 157 numbered minor plantes.
The International Astronomical Union"s Minor Planet Center ranks him 70th in the list of all-time, worldwide discoverers. The main-belt asteroid 22354 Sposetti has been named after him.