(1524) Joensuu Main-belt Asteroid
Discovered on 18 September 1939 by Y. Vaisala at Turku.
Where Joensuu is today
Seen from above the solar system on 2026-10-14: Joensuu is 2.81 au from the Sun and 2.66 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1524 |
| Provisional designation | 1939 SB |
| Orbit class | Main-belt Asteroid |
| Diameter | 45.1 km (#855 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0640 |
| Rotation period | 9.28 hours |
| Absolute magnitude (H) | 10.8 |
| Orbital period | 5.49 years |
| Semi-major axis | 3.11 au |
| Perihelion – aphelion | 2.74 – 3.48 au |
| Eccentricity | 0.120 |
| Inclination | 12.7° |
| Closest distance between its orbit and Earth's (MOID) | 1.73 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.