| Primary satellite | Secondary satellite |
| Name | FENGYUN 1C DEB | Cosmos 1666 Rocket |
| Spacetrack catalog number | 31165 | 15890 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2024 Dec 22 00:37 | 2024 Dec 23 02:26 |
| Time of closest approach (UTC) | 2024 Dec 28 06:43:42.808 |
| Minimum distance | 3.371 km |
| Height difference | 3.129 km |
| Relative speed | 15.086 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 48.9°S, 2.0°W |
| Height | 643 km |
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