(4155) Watanabe Main-belt Asteroid
Discovered on 25 October 1987 by Ueda, S., Kaneda, H. at Kushiro.
Where Watanabe is today
Seen from above the solar system on 2026-10-14: Watanabe is 2.73 au from the Sun and 3.40 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4155 |
| Provisional designation | 1987 UB1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 6.02 km (#8,896 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.280 |
| Rotation period | 4.50 hours |
| Absolute magnitude (H) | 13.41 |
| Orbital period | 3.80 years |
| Semi-major axis | 2.43 au |
| Perihelion – aphelion | 1.84 – 3.02 au |
| Eccentricity | 0.242 |
| Inclination | 6.02° |
| Closest distance between its orbit and Earth's (MOID) | 0.844 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.