- 57 Mnemosyne
-
57 Mnemosyne DiscoveryDiscovered by Karl Theodor Robert Luther Discovery date September 22, 1859 DesignationsNamed after Mnemosyne Alternate name(s) Minor planet
categoryMain belt Epoch December 31, 2006 (JD 2454100.5) Aphelion 526.785 Gm (3.521 AU) Perihelion 415.379 Gm (2.777 AU) Semi-major axis 471.082 Gm (3.149 AU) Eccentricity 0.118 Orbital period 2041.056 d (5.59 a) Average orbital speed 16.73 km/s Mean anomaly 68.001° Inclination 15.200° Longitude of ascending node 199.337° Argument of perihelion 212.848° Physical characteristicsDimensions 112.6 km Mass 1.5×1018 kg Mean density ? g/cm³ Equatorial surface gravity 0.0315 m/s² Escape velocity 0.0595 km/s Rotation period ? d Albedo 0.215 [1] Temperature ~157 K Spectral type S Absolute magnitude (H) 7.03 57 Mnemosyne (
/nɨˈmɒsɨniː/ ni-mos-i-nee) is a large main belt asteroid. It is an S-type asteroid in composition. It was discovered by Robert Luther on September 22, 1859 from Düsseldorf. Its name was chosen by Martin Hoek, director of the Utrecht Observatory, in reference to Mnemosyne, a Titaness in Greek mythology.[2]References
- ^ Asteroid Data Sets
- ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, p.20.
Minor planets navigator Small Solar System bodies Minor planets - Designation
- Groups
- Moons
- Meanings of names
- Pronunciation of names
Comets Meteoroids Lists / categories - Asteroid groups and families
- Asteroid moons
- Binary asteroids
- Minor planets
Categories:- Main Belt asteroids
- Asteroids named from Greek mythology
- S-type asteroids
- Astronomical objects discovered in 1859
- S-type Main Belt asteroid stubs
Wikimedia Foundation. 2010.
