(86) Semele Main-belt Asteroid
Discovered on 4 January 1866 by F. Tietjen at Berlin.
Where Semele is today
Seen from above the solar system on 2026-10-14: Semele is 3.56 au from the Sun and 4.48 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 86 |
| Provisional designation | A866 AA |
| Orbit class | Main-belt Asteroid |
| Diameter | 110 km (#197 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0560 |
| Rotation period | 16.6 hours |
| Spectral type | C |
| Absolute magnitude (H) | 8.71 |
| Orbital period | 5.47 years |
| Semi-major axis | 3.10 au |
| Perihelion – aphelion | 2.43 – 3.78 au |
| Eccentricity | 0.218 |
| Inclination | 4.82° |
| Closest distance between its orbit and Earth's (MOID) | 1.44 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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