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Discovery and designation
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| Discovered by | E. F. Helin |
| Discovery site | Palomar |
| Discovery date | August 15, 1991 |
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Designations
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| MPC designation | 5521 |
| Alternate name(s) | 1991 PM1 |
| Epoch May 14, 2008 | |
| Ap | 3.0720474 |
| Peri | 2.0801962 |
| Eccentricity | 0.1925086 |
| Orbital period | 1510.2471528 |
| Mean anomaly | 2.89216 |
| Inclination | 11.16089 |
| Longitude of ascending node | 90.89912 |
| Argument of peri | 266.55849 |
| Geometric albedo | 0.2393 |
| Absolute magnitude (H) | 12.40 |
5521 Morpurgo (1991 PM1) is a main-belt asteroid discovered on August 15, 1991 by E. F. Helin at Palomar.
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