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Discovery
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| Discovered by | Y. Vaisala |
| Discovery site | Turku |
| Discovery date | January 19, 1939 |
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Designations
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| MPC designation | 1646 |
| Named after | Svein Rosseland |
| Alternate name(s) | 1939 BG |
| Epoch May 14, 2008 | |
| Ap | 2.6426549 |
| Peri | 2.0772331 |
| Eccentricity | 0.1197956 |
| Orbital period | 1324.1920433 |
| Mean anomaly | 116.65981 |
| Inclination | 8.38539 |
| Longitude of ascending node | 120.05364 |
| Argument of peri | 279.91935 |
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Physical characteristics
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| Absolute magnitude (H) | 11.82 |
1646 Rosseland (1939 BG) is a main-belt asteroid discovered on January 19, 1939 by Y. Vaisala at Turku.
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