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Discovery and designation
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| Discovered by | Schelte J. Bus |
| Discovery site | Siding Spring Observatory |
| Discovery date | March 1, 1981 |
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Designations
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| MPC designation | 4320 |
| Named after | Eugene Jarosewich |
| Alternate name(s) | 1981 EJ17 |
| Epoch May 14, 2008 | |
| Ap | 2.4458458 |
| Peri | 1.9497966 |
| Eccentricity | 0.1128502 |
| Orbital period | 1190.1096336 |
| Mean anomaly | 179.64985 |
| Inclination | 6.44429 |
| Longitude of ascending node | 191.10028 |
| Argument of peri | 277.54122 |
| Absolute magnitude (H) | 15.3 |
4320 Jarosewich (1981 EJ17) is a main-belt asteroid discovered on March 1, 1981 by Schelte J. Bus at Siding Spring Observatory in the course of the U.K. Schmidt-Caltech Asteroid Survey. The asteroid is named after Eugene Jarosewich..
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