134 Sophrosyne
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Discovery
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| Discovered by | Karl Theodor Robert Luther |
| Discovery date | September 27, 1873 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 428.174 Gm (2.862 AU) |
| Perihelion | 338.780 Gm (2.265 AU) |
| Semi-major axis | 383.477 Gm (2.563 AU) |
| Eccentricity | 0.117 |
| Orbital period | 1499.059 d (4.10 a) |
| Average orbital speed | 18.54 km/s |
| Mean anomaly | 110.425° |
| Inclination | 11.588° |
| Longitude of ascending node | 346.213° |
| Argument of perihelion | 83.723° |
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Physical characteristics
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| Dimensions | 123.3 km |
| Mass | 2.0×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0345 m/s² |
| Escape velocity | 0.0652 km/s |
| Rotation period | ? d |
| Albedo | 0.0364 (Dark) |
| Temperature | ~174 K |
| Spectral type | C |
| Absolute magnitude | 8.76 |
134 Sophrosyne is a large main belt asteroid. It has an exceedingly dark surface and most likely a primitive carbonaceous composition. It was discovered by Robert Luther on September 27, 1873, and is named after the concept of sophrosyne, Plato's term for 'moderation'.
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