57 Mnemosyne

**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 (ni-mos'-i-nee) 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 in Greek mythology.

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For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.

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