(3998) Tezuka Main-belt Asteroid
Discovered on 1 January 1989 by T. Kojima at Chiyoda.
Where Tezuka is today
Seen from above the solar system on 2026-10-14: Tezuka is 1.83 au from the Sun and 1.68 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 3998 |
| Provisional designation | 1989 AB |
| Orbit class | Main-belt Asteroid |
| Diameter | 6.86 km (#7,818 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.260 |
| Rotation period | 3.08 hours |
| Absolute magnitude (H) | 13.03 |
| Orbital period | 3.44 years |
| Semi-major axis | 2.28 au |
| Perihelion – aphelion | 1.83 – 2.73 au |
| Eccentricity | 0.195 |
| Inclination | 6.49° |
| Closest distance between its orbit and Earth's (MOID) | 0.862 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.