(4066) Haapavesi Main-belt Asteroid
Discovered on 7 September 1940 by H. Alikoski at Turku.
Where Haapavesi is today
Seen from above the solar system on 2026-10-14: Haapavesi is 2.56 au from the Sun and 3.55 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4066 |
| Provisional designation | 1940 RG |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.13 km (#12,437 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.472 |
| Rotation period | 342 hours |
| Absolute magnitude (H) | 13.63 |
| Orbital period | 3.36 years |
| Semi-major axis | 2.24 au |
| Perihelion – aphelion | 1.74 – 2.74 au |
| Eccentricity | 0.224 |
| Inclination | 5.28° |
| Closest distance between its orbit and Earth's (MOID) | 0.739 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.