(8421) Montanari Main-belt Asteroid
Discovered on 2 December 1996 by Osservatorio San Vittore at Bologna.
Where Montanari is today
Seen from above the solar system on 2026-10-14: Montanari is 2.79 au from the Sun and 3.21 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8421 |
| Provisional designation | 1996 XA9 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.66 km (#9,471 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.264 |
| Absolute magnitude (H) | 13.67 |
| Orbital period | 4.87 years |
| Semi-major axis | 2.87 au |
| Perihelion – aphelion | 2.77 – 2.98 au |
| Eccentricity | 0.0352 |
| Inclination | 2.34° |
| Closest distance between its orbit and Earth's (MOID) | 1.79 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.