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Discovery and designation
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| Discovered by | Eleanor F. Helin |
| Discovery site | Palomar |
| Discovery date | October 4, 1986 |
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Designations
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| MPC designation | 4209 |
| Alternate name(s) | 1986 TG4 |
| Epoch May 14, 2008 | |
| Ap | 3.4349994 |
| Peri | 2.8791764 |
| Eccentricity | 0.0880278 |
| Orbital period | 2048.9362236 |
| Mean anomaly | 317.80497 |
| Inclination | 21.61725 |
| Longitude of ascending node | 330.41536 |
| Argument of peri | 12.41377 |
| Geometric albedo | 0.1288 |
| Absolute magnitude (H) | 10.80 |
4209 Briggs (1986 TG4) is a main-belt asteroid discovered on October 4, 1986 by Eleanor F. Helin at Palomar.
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