(21331) Lodovicoferrari Main-belt Asteroid
Discovered on 17 January 1997 by P. G. Comba at Prescott.
Lodovico Ferrari (1522-1565), assistant and protégé of Cardano and lecturer in mathematics in Milan, discovered the solution of the quartic algebraic equation.Naming citation (20010509/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Lodovicoferrari is today
Seen from above the solar system on 2026-10-14: Lodovicoferrari is 2.25 au from the Sun and 3.23 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21331 |
| Provisional designation | 1997 BO |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.79 km (#15,685 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.300 |
| Absolute magnitude (H) | 15.13 |
| Orbital period | 4.12 years |
| Semi-major axis | 2.57 au |
| Perihelion – aphelion | 1.98 – 3.16 au |
| Eccentricity | 0.229 |
| Inclination | 5.29° |
| Closest distance between its orbit and Earth's (MOID) | 0.967 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.