(3128) Obruchev Main-belt Asteroid
Discovered on 23 March 1979 by N. S. Chernykh at Nauchnyj.
Where Obruchev is today
Seen from above the solar system on 2026-10-14: Obruchev is 3.55 au from the Sun and 3.30 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 3128 |
| Provisional designation | 1979 FJ2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 20.4 km (#2,155 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.107 |
| Rotation period | 12.6 hours |
| Absolute magnitude (H) | 12.25 |
| Orbital period | 5.50 years |
| Semi-major axis | 3.11 au |
| Perihelion – aphelion | 2.62 – 3.60 au |
| Eccentricity | 0.157 |
| Inclination | 2.94° |
| Closest distance between its orbit and Earth's (MOID) | 1.61 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.