(1309) Hyperborea Outer Main-belt Asteroid
Discovered on 11 October 1931 by G. N. Neujmin at Simeis.
Where Hyperborea is today
Seen from above the solar system on 2026-10-14: Hyperborea is 3.61 au from the Sun and 4.41 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1309 |
| Provisional designation | 1931 TO |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 57.6 km (#625 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0430 |
| Rotation period | 13.9 hours |
| Absolute magnitude (H) | 10.37 |
| Orbital period | 5.75 years |
| Semi-major axis | 3.21 au |
| Perihelion – aphelion | 2.74 – 3.68 au |
| Eccentricity | 0.146 |
| Inclination | 10.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.78 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.