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Discovery
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| Discovered by | Karl Theodor Robert Luther |
| Discovery date | August 25, 1865 |
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Designations
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| Named after | Clio |
| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 436.886 Gm (2.920 AU) |
| Perihelion | 269.828 Gm (1.804 AU) |
| Semi-major axis | 353.357 Gm (2.362 AU) |
| Eccentricity | 0.236 |
| Orbital period | 1325.961 d (3.63 a) |
| Average orbital speed | 19.11 km/s |
| Mean anomaly | 326.072° |
| Inclination | 9.334° |
| Longitude of ascending node | 327.651° |
| Argument of perihelion | 14.690° |
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Physical characteristics
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| Dimensions | 79.16 km[1] |
| Mass | 5.2×1017 kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0221 m/s² |
| Escape velocity | 0.0419 km/s |
| Rotation period | 5.8 h[1] |
| Albedo | 0.053[1][2] |
| Temperature | ~181 K |
| Spectral type | G[1] |
| Absolute magnitude (H) | 9.32[1] |
84 Klio ( /ˈklaɪ.oʊ/ kly-oh) is a quite large and very dark main-belt asteroid. It was discovered by R. Luther on August 25, 1865, and named after Clio, the Muse of history in Greek mythology. The name Clio had previously been suggested by the discoverer of 12 Victoria, and that is the name B. A. Gould, editor of the prestigious Astronomical Journal, adopted for that asteroid, because of the controversy over the name Victoria. An occultation by Klio over a dim star was observed on April 2, 1997.
Perturbations of asteroid 52 Europa by 84 Klio suggest that 52 Europa would have a mass as high as 1.68×1020 kg.[3][4] But this would require Europa to have an unrealistic density of 10.6 g/cm³.[3] Further observations of Klio will be needed to properly refine the mass of both asteroid Europa and Klio.
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