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Discovery and designation
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| Discovered by | Robert H. McNaught |
| Discovery site | Siding Spring |
| Discovery date | February 22, 1988 |
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Designations
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| MPC designation | 4220 |
| Alternate name(s) | 1988 DN |
| Epoch May 14, 2008 | |
| Ap | 3.3504038 |
| Peri | 2.2565274 |
| Eccentricity | 0.1950936 |
| Orbital period | 1714.5149694 |
| Mean anomaly | 155.94413 |
| Inclination | 6.99172 |
| Longitude of ascending node | 221.57405 |
| Argument of peri | 231.52927 |
| Absolute magnitude (H) | 13.3 |
4220 Flood (1988 DN) is a main-belt asteroid discovered on February 22, 1988 by Robert H. McNaught at Siding Spring.
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