(18818) Yasuhiko Main-belt Asteroid
Discovered on 21 June 1999 by T. Okuni at Nanyo.
Yasuhiko Takahashi (b. 1934) is the younger brother-in-law of the discoverer.Naming citation (20021120/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Yasuhiko is today
Seen from above the solar system on 2026-10-14: Yasuhiko is 2.02 au from the Sun and 2.75 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 18818 |
| Provisional designation | 1999 MB2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.89 km (#10,841 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.204 |
| Absolute magnitude (H) | 13.76 |
| Orbital period | 3.45 years |
| Semi-major axis | 2.28 au |
| Perihelion – aphelion | 1.97 – 2.59 au |
| Eccentricity | 0.136 |
| Inclination | 6.09° |
| Closest distance between its orbit and Earth's (MOID) | 0.979 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.