71 Niobe
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Discovery
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| Discovered by | Karl Theodor Robert Luther |
| Discovery date | August 13, 1861 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 484.945 Gm (3.242 AU) |
| Perihelion | 339.408 Gm (2.269 AU) |
| Semi-major axis | 412.176 Gm (2.755 AU) |
| Eccentricity | 0.177 |
| Orbital period | 1670.455 d (4.57 a) |
| Average orbital speed | 17.80 km/s |
| Mean anomaly | 13.883° |
| Inclination | 23.256° |
| Longitude of ascending node | 316.094° |
| Argument of perihelion | 267.445° |
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Physical characteristics
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| Dimensions | 83.4 km |
| Mass | 6.1×1017 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0233 m/s² |
| Escape velocity | 0.0441 km/s |
| Rotation period | ? d |
| Albedo | 0.305 [1] |
| Temperature | ~168 K |
| Spectral type | S |
| Absolute magnitude | 7.30 |
71 Niobe (nye'-ə-bee, IPA: /ˈnaɪəbi/) is a quite large main belt asteroid. It was discovered by Robert Luther on August 13, 1861 and named after Niobe, a character in Greek mythology.
[edit] References
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