(1691) Oort Main-belt Asteroid
Discovered on 9 September 1956 by K. Reinmuth at Heidelberg.
Where Oort is today
Seen from above the solar system on 2026-10-14: Oort is 3.38 au from the Sun and 4.27 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1691 |
| Provisional designation | 1956 RB |
| Orbit class | Main-belt Asteroid |
| Diameter | 33.6 km (#1,204 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0650 |
| Rotation period | 10.3 hours |
| Spectral type | CU |
| Absolute magnitude (H) | 10.95 |
| Orbital period | 5.62 years |
| Semi-major axis | 3.16 au |
| Perihelion – aphelion | 2.60 – 3.73 au |
| Eccentricity | 0.179 |
| Inclination | 1.09° |
| Closest distance between its orbit and Earth's (MOID) | 1.60 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.