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Discovery and designation
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| Discovered by | Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels |
| Discovery site | Palomar Observatory |
| Discovery date | September 29, 1973 |
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Designations
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| MPC designation | 4721 |
| Named after | Atahualpa |
| Alternate name(s) | 4239 T-2 |
| Epoch May 14, 2008 | |
| Ap | 2.5283571 |
| Peri | 1.9804605 |
| Eccentricity | 0.1215167 |
| Orbital period | 1236.3670357 |
| Mean anomaly | 181.79124 |
| Inclination | 4.36624 |
| Longitude of ascending node | 39.44589 |
| Argument of peri | 215.64149 |
| Absolute magnitude (H) | 13.7 |
4721 Atahualpa (4239 T-2) is a main-belt asteroid discovered on September 29, 1973 by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at Palomar Observatory.
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