(2299) Hanko Main-belt Asteroid
Discovered on 25 September 1941 by Y. Vaisala at Turku.
Where Hanko is today
Seen from above the solar system on 2026-10-14: Hanko is 3.35 au from the Sun and 4.15 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 2299 |
| Provisional designation | 1941 SZ |
| Orbit class | Main-belt Asteroid |
| Diameter | 6.52 km (#8,227 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.262 |
| Rotation period | 87.6 hours |
| Absolute magnitude (H) | 13.34 |
| Orbital period | 4.16 years |
| Semi-major axis | 2.59 au |
| Perihelion – aphelion | 1.82 – 3.35 au |
| Eccentricity | 0.297 |
| Inclination | 5.26° |
| Closest distance between its orbit and Earth's (MOID) | 0.811 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.