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Discovery and designation
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| Discovered by | H. Debehogne |
| Discovery site | European Southern Observatory |
| Discovery date | September 5, 1985 |
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Designations
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| MPC designation | 3457 |
| Named after | Arne Nordheim |
| Alternate name(s) | 1985 RA3 |
| Epoch May 14, 2008 | |
| Ap | 3.0133454 |
| Peri | 2.6927702 |
| Eccentricity | 0.0561810 |
| Orbital period | 1760.2092380 |
| Mean anomaly | 278.23123 |
| Inclination | 3.25020 |
| Longitude of ascending node | 101.41286 |
| Argument of peri | 211.34693 |
| Absolute magnitude (H) | 11.8 |
3457 Arnenordheim (1985 RA3) is a main-belt asteroid discovered on September 5, 1985 by Henri Debehogne at the European Southern Observatory. It is named after the Norwegian composer Arne Nordheim.
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