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Discovery and designation
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| Discovered by | E. F. Helin |
| Discovery site | Palomar |
| Discovery date | July 8, 1991 |
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Designations
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| MPC designation | 6403 |
| Alternate name(s) | 1991 NU |
| Epoch May 14, 2008 | |
| Ap | 2.9191699 |
| Peri | 2.2698811 |
| Eccentricity | 0.1251267 |
| Orbital period | 1526.4597163 |
| Mean anomaly | 4.13235 |
| Inclination | 14.31861 |
| Longitude of ascending node | 228.90454 |
| Argument of peri | 63.73803 |
| Absolute magnitude (H) | 12.2 |
6403 Steverin (1991 NU) is a main-belt asteroid discovered on July 8, 1991 by E. F. Helin at Palomar.
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