(685) Hermia Main-belt Asteroid
Discovered on 12 August 1909 by W. Lorenz at Heidelberg.
Where Hermia is today
Seen from above the solar system on 2026-10-14: Hermia is 1.85 au from the Sun and 1.11 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 685 |
| Provisional designation | A909 PC |
| Orbit class | Main-belt Asteroid |
| Diameter | 10.9 km (#4,597 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.281 |
| Rotation period | 50.4 hours |
| Absolute magnitude (H) | 12.04 |
| Orbital period | 3.34 years |
| Semi-major axis | 2.24 au |
| Perihelion – aphelion | 1.79 – 2.68 au |
| Eccentricity | 0.197 |
| Inclination | 3.65° |
| Closest distance between its orbit and Earth's (MOID) | 0.785 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by W. Lorenz
← (684) Hildburg · (686) Gersuind →