(57) Mnemosyne

Asteroid (57) Mnemosyne
Properties of the orbit ( animation )
Orbit type	Outer main belt
Major semi-axis	3.155 AU
eccentricity	0.117
Perihelion - aphelion	2.786 AU - 3.524 AU
Inclination of the orbit plane	15.2 °
Length of the ascending node	199.2 °
Argument of the periapsis	211.2 °
Time of passage of the perihelion	4th July 2011
Sidereal period	5 a 221 d
Mean orbital velocity	16.7 km / s
Physical Properties
Medium diameter	113 km
Albedo	0.2149
Rotation period	12 h 28 min
Absolute brightness	7.03 mag
Spectral class	S.
history
Explorer	KTR Luther
Date of discovery	September 22, 1859
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(57) Mnemosyne is an asteroid that was discovered on September 22, 1859 by the German astronomer Karl Theodor Robert Luther .

It was named after Mnemosyne , the Greek mythology after the daughter of Uranus and Gaia .

See also