(57) Mnemosyne Main-belt Asteroid
Discovered on 22 September 1859 by R. Luther at Dusseldorf.
Where Mnemosyne is today
Seen from above the solar system on 2026-10-14: Mnemosyne is 3.23 au from the Sun and 3.21 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 57 |
| Provisional designation | A859 SA |
| Orbit class | Main-belt Asteroid |
| Diameter | 113 km (#186 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.215 |
| Rotation period | 25.3 hours |
| Spectral type | S |
| Absolute magnitude (H) | 6.93 |
| Orbital period | 5.61 years |
| Semi-major axis | 3.16 au |
| Perihelion – aphelion | 2.82 – 3.50 au |
| Eccentricity | 0.108 |
| Inclination | 15.2° |
| Closest distance between its orbit and Earth's (MOID) | 1.83 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by R. Luther
- (17) Thetis
- (26) Proserpina
- (28) Bellona
- (35) Leukothea
- (37) Fides
- (47) Aglaja
- (53) Kalypso
- (58) Concordia
- (68) Leto
- (71) Niobe
- (78) Diana
- (82) Alkmene
← (56) Melete · (58) Concordia →