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Discovery and designation
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| Discovered by | E. F. Helin |
| Discovery site | Palomar |
| Discovery date | January 11, 1991 |
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Designations
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| MPC designation | 6645 |
| Alternate name(s) | 1991 AR1 |
| Epoch May 14, 2008 | |
| Ap | 3.7549129 |
| Peri | 2.5112123 |
| Eccentricity | 0.1984800 |
| Orbital period | 2025.5922325 |
| Mean anomaly | 69.09986 |
| Inclination | 0.79117 |
| Longitude of ascending node | 24.81646 |
| Argument of peri | 30.90024 |
| Absolute magnitude (H) | 12.5 |
6645 Arcetri (1991 AR1) is a main-belt asteroid discovered on January 11, 1991 by E. F. Helin at Palomar.
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