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Discovery and designation
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| Discovered by | Kiichiro Hurukawa and Hiroki Kosai |
| Discovery site | Kiso Station |
| Discovery date | November 14, 1982 |
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Designations
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| MPC designation | 3878 |
| Named after | Jōmon period |
| Alternate name(s) | 1982 VR4 |
| Epoch May 14, 2008 | |
| Ap | 3.6771902 |
| Peri | 2.5327938 |
| Eccentricity | 0.1842833 |
| Orbital period | 1998.4310096 |
| Mean anomaly | 283.40630 |
| Inclination | 2.24632 |
| Longitude of ascending node | 158.12633 |
| Argument of peri | 196.67086 |
| Absolute magnitude (H) | 12.8 |
3878 Jyoumon (1982 VR4) is a main-belt asteroid discovered on November 14, 1982 by Kiichiro Hurukawa and Hiroki Kosai at Kiso Station.
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