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Discovery
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| Discovered by | Y. Vaisala |
| Discovery site | Turku |
| Discovery date | September 12, 1936 |
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Designations
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| MPC designation | 1405 |
| Named after | Jean Sibelius |
| Alternate name(s) | 1936 RE |
| Epoch May 14, 2008 | |
| Ap | 2.5806114 |
| Peri | 1.9229072 |
| Eccentricity | 0.1460423 |
| Orbital period | 1234.1881217 |
| Mean anomaly | 40.34100 |
| Inclination | 7.03663 |
| Longitude of ascending node | 312.16734 |
| Argument of peri | 95.93612 |
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Physical characteristics
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| Albedo | 0.1432 |
| Absolute magnitude (H) | 12.30 |
1405 Sibelius (1936 RE) is a main-belt asteroid discovered on September 12, 1936 by Y. Vaisala at Turku.
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