It was discovered on 15 September 1990, by American astronomer Henry Holt at Palomar Observatory in California, United States.
[1] This minor planet was named after Italian geodesists Alessandro Rossi (born 1964), a member of the "Group of Satellite Flight Dynamics" at the Istituto CNECE in Pisa, Italy.
Expert in space geodesy and participant in the Laser Geodynamics Satellites (LAGEOS) mission, he examines Earth's artificial orbital debris, the natural debris around mission targets to improve space-craft maneuvers, and the potential hazard of Earth-crossers.
[8] According to the surveys carried out by the Infrared Astronomical Satellite IRAS and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Alerossi measures 12.9 and 13.3 kilometers in diameter and its surface has an albedo of 0.08 and 0.14, respectively.
[1][3] As of 2018, the asteroid's spectral type, rotation period and shape remain unknown.