(55477) Soroban Main-belt Asteroid
Discovered on 18 October 2001 by H. Maeno at Shishikui.
The soroban, or abacus, is an important tool of Japanese culture, used to calculate and record numbers. It has been used in Japan since 1624.Naming citation (20050721/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Soroban is today
Seen from above the solar system on 2026-10-14: Soroban is 3.72 au from the Sun and 4.57 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 55477 |
| Provisional designation | 2001 UC1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.06 km (#6,521 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0680 |
| Absolute magnitude (H) | 14.32 |
| Orbital period | 5.59 years |
| Semi-major axis | 3.15 au |
| Perihelion – aphelion | 2.49 – 3.81 au |
| Eccentricity | 0.209 |
| Inclination | 2.77° |
| Closest distance between its orbit and Earth's (MOID) | 1.48 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.