It was discovered on 6 August 1980, by observers at ESO's La Silla Observatory site in northern Chile.
[2] Solidarity orbits the Sun in the central main-belt at a distance of 2.3–3.3 AU once every 4 years and 8 months (1,700 days).
[8] In January 2011, a rotational lightcurve of Solidarity was obtained from photometric observations at the Palomar Transient Factory in California.
[6] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Solidarity measures 8.4 kilometers in diameter and its surface has an albedo of 0.17,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 12.9 kilometers with an absolute magnitude of 13.18.
As a commemorative gesture, the IAU's Committee for the Nomenclature of Small Bodies chose three objects discovered in observatories on different continents and christened them with names representing some of the most basic and universal human values.