(1389) Onnie Main-belt Asteroid
Discovered on 28 September 1935 by H. van Gent at Johannesburg.
Where Onnie is today
Seen from above the solar system on 2026-10-14: Onnie is 2.90 au from the Sun and 3.04 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1389 |
| Provisional designation | 1935 SS1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 13.8 km (#3,452 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.198 |
| Rotation period | 23.0 hours |
| Absolute magnitude (H) | 11.55 |
| Orbital period | 4.85 years |
| Semi-major axis | 2.87 au |
| Perihelion – aphelion | 2.83 – 2.90 au |
| Eccentricity | 0.0110 |
| Inclination | 2.05° |
| Closest distance between its orbit and Earth's (MOID) | 1.85 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 28 September 1935
- (1686) De Sitter
- (1986) Plaut
- (2019) van Albada
- (2203) van Rhijn
- (2801) Huygens
- (2945) Zanstra
- (4296) van Woerkom
- (4359) Berlage
- (4511) Rembrandt