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Discovery
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| Discovered by | Ingrid van Houten-Groeneveld and Karl Wilhelm Reinmuth |
| Discovery site | Heidelberg |
| Discovery date | September 9, 1956 |
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Designations
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| MPC designation | 1691 |
| Named after | Jan Oort |
| Alternate name(s) | 1956 RB |
| Epoch May 14, 2008 | |
| Ap | 3.7041652 |
| Peri | 2.6331262 |
| Eccentricity | 0.1690058 |
| Orbital period | 2060.1978362 |
| Mean anomaly | 5.89751 |
| Inclination | 1.07707 |
| Longitude of ascending node | 174.65986 |
| Argument of peri | 232.63108 |
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Physical characteristics
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| Absolute magnitude (H) | 10.95 |
1691 Oort (1956 RB) is a main-belt asteroid discovered on September 9, 1956 by Ingrid van Houten-Groeneveld and Karl Wilhelm Reinmuth at Heidelberg. It was named after the Dutch astronomer Jan Oort.
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