(10321) Rampo Main-belt Asteroid
Discovered on 26 October 1990 by T. Seki at Geisei.
Rampo Edogawa (Hirai Taro, 1894-1965), born in Nabari city, Mie prefecture, was a writer who specialized in Japan's mystery genre. He was popular with young readers, and one of his best-known novels is The Boy Detectives Club.Naming citation (20070106/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Rampo is today
Seen from above the solar system on 2026-10-14: Rampo is 2.40 au from the Sun and 2.16 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 10321 |
| Provisional designation | 1990 UN2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.88 km (#13,048 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.295 |
| Rotation period | 5.23 hours |
| Absolute magnitude (H) | 14.33 |
| Orbital period | 3.55 years |
| Semi-major axis | 2.33 au |
| Perihelion – aphelion | 2.11 – 2.55 au |
| Eccentricity | 0.0945 |
| Inclination | 6.06° |
| Closest distance between its orbit and Earth's (MOID) | 1.11 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.