57 Mnemosyne
| Orbital characteristics 1 | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 3.150 AU |
| Perihelion distance | 2.776 AU |
| Aphelion distance | 3.523 AU |
| Orbital period | 5.59 years |
| Inclination | 15.20° |
| Eccentricity | 0.119 |
| Physical characteristics 1 | |
| Diameter | 112.6 km |
| Rotation period 3 | 12.463 hours |
| Spectral class | S |
| Abs. magnitude | 7.03 |
| Albedo 4 | 0.215 |
| History 2 | |
| Discoverer | R. Luther, 1859 |
57 Mnemosyne is a large Main belt asteroid. It is a S-type asteroid, so it has a bright surface and is probably a mixture of iron-nickel and silicates.
It was discovered by R. Luther on September 22, 1859. It is named after Mnemosyne, a titaness from the greek mythology.