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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| 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 | 7.03 |
57 Mnemosyne (ni-mos'-i-nee, IPA: /nɨˈmɒsɨni/) is a large Main belt asteroid. It is a S-type asteroid. It was discovered by R. Luther on September 22, 1859. It is named after Mnemosyne, a Titaness in Greek mythology.
[edit] References
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