| Primary satellite | Secondary satellite |
| Name | Cosmos 1666 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 15890 | 33678 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 16:44 | 2024 Dec 21 13:47 |
| Time of closest approach (UTC) | 2024 Dec 23 11:49:53.234 |
| Minimum distance | 3.665 km |
| Height difference | -0.966 km |
| Relative speed | 15.112 km/s |
| Angle between velocity vectors | 175° |
| Geographic position | 67.6°S, 79.2°W |
| Height | 649 km |
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