78 Diana
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Discovery
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| Discovered by | Karl Theodor Robert Luther |
| Discovery date | March 15, 1865 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 473.182 Gm (3.163 AU) |
| Perihelion | 310.686 Gm (2.077 AU) |
| Semi-major axis | 391.934 Gm (2.620 AU) |
| Eccentricity | 0.207 |
| Orbital period | 1548.922 d (4.24 a) |
| Average orbital speed | 18.20 km/s |
| Mean anomaly | 353.808° |
| Inclination | 8.688° |
| Longitude of ascending node | 333.582° |
| Argument of perihelion | 151.423° |
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Physical characteristics
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| Dimensions | 120.6 km |
| Mass | 1.8×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0337 m/s² |
| Escape velocity | 0.0638 km/s |
| Rotation period | ? d |
| Albedo | 0.071 [1] |
| Temperature | ~172 K |
| Spectral type | C |
| Absolute magnitude | 8.09 |
78 Diana (dye-an'-a) is a large and dark main belt asteroid. Its composition is carbonaceous and primitive. It was discovered by Robert Luther on March 15, 1863 and named after Diana, Roman goddess of the hunt. 78 Diana occulted a star on September 4, 1980. A diameter of 116 km was measured, closely matching the value given by the IRAS satellite.
[edit] References
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