(1757) Porvoo Main-belt Asteroid
Discovered on 17 March 1939 by Y. Vaisala at Turku.
Named for the second oldest (after Turku) town in Finland. At the Porvoo Diet in 1809 the Russian czar confirmed that Finland was annexed to the Russian empire as an autonomous nation.Naming citation (MPC 5449), IAU / Minor Planet Center, via NASA/JPL
Where Porvoo is today
Seen from above the solar system on 2026-10-14: Porvoo is 2.40 au from the Sun and 2.52 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1757 |
| Provisional designation | 1939 FC |
| Orbit class | Main-belt Asteroid |
| Diameter | 10.2 km (#4,979 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0680 |
| Rotation period | 4.89 hours |
| Absolute magnitude (H) | 13.56 |
| Orbital period | 3.61 years |
| Semi-major axis | 2.35 au |
| Perihelion – aphelion | 2.06 – 2.65 au |
| Eccentricity | 0.125 |
| Inclination | 3.97° |
| Closest distance between its orbit and Earth's (MOID) | 1.06 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.