(3258) Somnium Main-belt Asteroid
Discovered on 8 September 1983 by P. Wild at Zimmerwald.
Where Somnium is today
Seen from above the solar system on 2026-10-14: Somnium is 2.08 au from the Sun and 1.55 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 3258 |
| Provisional designation | 1983 RJ |
| Orbit class | Main-belt Asteroid |
| Rotation period | 5.34 hours |
| Spectral type | S |
| Absolute magnitude (H) | 13.3 |
| Orbital period | 3.28 years |
| Semi-major axis | 2.21 au |
| Perihelion – aphelion | 1.77 – 2.64 au |
| Eccentricity | 0.196 |
| Inclination | 7.55° |
| Closest distance between its orbit and Earth's (MOID) | 0.780 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.