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Discovery
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| Discovered by | James Craig Watson[1] |
| Discovery date | September 7, 1868[1] |
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Designations
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| Named after | Hera |
| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch August 27, 2011 (JD 2455800.5)[1] | |
| Aphelion | 437.17 Gm (2.9223 AU)[1] |
| Perihelion | 371.24 Gm (2.4816 AU)[1] |
| Semi-major axis | 404.202 Gm (2.702 AU)[1] |
| Eccentricity | 0.0815455[1] |
| Orbital period | 1622.213 d (4.4414 a)[1] |
| 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 | ~170 K |
| Spectral type | S |
| Absolute magnitude (H) | 7.66 |
103 Hera is a moderately 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 and fifth in power of the Olympian gods in Greek mythology.
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