57 Mnemosyne
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Discovery
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| Discovered by | Karl Theodor Robert Luther |
| Discovery date | September 22, 1859 |
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Designations
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| Named after | Mnemosyne |
| Alternate name(s) | |
| Minor planet category |
Main 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° |
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Physical characteristics
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| Dimensions | 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]
[edit] References
- ^ Asteroid Data Sets
- ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, p.20.
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