59 Elpis
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Discovery
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| Discovered by | Jean Chacornac |
| Discovery date | September 12, 1860 |
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Designations
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| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 453.624 Gm (3.032 AU) |
| Perihelion | 358.808 Gm (2.398 AU) |
| Semi-major axis | 406.216 Gm (2.715 AU) |
| Eccentricity | 0.117 |
| Orbital period | 1634.355 d (4.47 a) |
| Average orbital speed | 18.01 km/s |
| Mean anomaly | 246.848° |
| Inclination | 8.631° |
| Longitude of ascending node | 170.209° |
| Argument of perihelion | 210.901° |
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Physical characteristics
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| Dimensions | 164.8 km |
| Mass | 4.7×1018 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0461 m/s² |
| Escape velocity | 0.0871 km/s |
| Rotation period | ? d |
| Albedo | 0.044 [1] |
| Temperature | ~169 K |
| Spectral type | C |
| Absolute magnitude | 7.93 |
59 Elpis (el'-pis, IPA: /ˈɛlpɨs/) is a very large main belt asteroid. Being a C-type asteroid it is very dark and carbonaceous. Elpis was discovered by J. Chacornac on September 12, 1860. It was his sixth and final asteroid discovery. It is named after Elpis, a personification of hope in Greek mythology.
[edit] References
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