| Primary satellite | Secondary satellite |
| Name | FENGYUN 1C DEB | Cosmos 385 |
| Spacetrack catalog number | 30599 | 4799 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2024 Dec 22 12:23 | 2024 Dec 23 02:09 |
| Time of closest approach (UTC) | 2024 Dec 25 21:57:31.454 |
| Minimum distance | 2.321 km |
| Height difference | -2.312 km |
| Relative speed | 14.561 km/s |
| Angle between velocity vectors | 167° |
| Geographic position | 52.5°N, 59.6°W |
| Height | 988 km |
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