103 Hera
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Discovery
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| Discovered by | James Craig Watson |
| Discovery date | September 7, 1868 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 436.522 Gm (2.918 AU) |
| Perihelion | 372.135 Gm (2.488 AU) |
| Semi-major axis | 404.328 Gm (2.703 AU) |
| Eccentricity | 0.080 |
| Orbital period | 1622.975 d (4.44 a) |
| Average orbital speed | 18.09 km/s |
| Mean anomaly | 74.835° |
| Inclination | 5.421° |
| Longitude of ascending node | 136.276° |
| Argument of perihelion | 190.160° |
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Physical characteristics
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| Dimensions | 91.2 km |
| Mass | 7.9×1017 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0255 m/s² |
| Escape velocity | 0.0482 km/s |
| Rotation period | ? d |
| Albedo | ? |
| Temperature | ~169 K |
| Spectral type | S |
| Absolute magnitude | 7.66 |
103 Hera is a large main belt asteroid. It has a silicate surface composition. It was discovered by J. C. Watson on September 7, 1868 and named after Hera, queen of the gods in Greek mythology.
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