 According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Lagrangea" measures between 29.56 and 35.31 kilometers in diameter and its surface has an albedo between 0.046 and 0.067.The "Collaborative Asteroid Lightcurve Link" derives an albedo of 0.0612 and a diameter of 29.53 kilometers based on an absolute magnitude of 11.3.This minor planet was named after Italian mathematician Joseph-Louis Lagrange (1736–1813), who made significant contributions to astronomy, in particular celestial mechanics.