(8357) O'Connor Main-belt Asteroid
Discovered on 25 September 1989 by Oak Ridge Observatory at Harvard.
Named in honor of J. Dennis O'Connor (b. 1942), internationally acknowledged biological scientist, provost and staunch proponent of research excellence at the Smithsonian Institution, and resolute champion of the programs of the Astrophysical Observatory.Naming citation (19980808/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where O'Connor is today
Seen from above the solar system on 2026-10-14: O'Connor is 2.09 au from the Sun and 2.67 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8357 |
| Provisional designation | 1989 SC1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.14 km (#12,400 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.341 |
| Rotation period | 7.77 hours |
| Absolute magnitude (H) | 13.94 |
| Orbital period | 3.43 years |
| Semi-major axis | 2.27 au |
| Perihelion – aphelion | 1.89 – 2.66 au |
| Eccentricity | 0.170 |
| Inclination | 1.56° |
| Closest distance between its orbit and Earth's (MOID) | 0.876 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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