| Primary satellite | Secondary satellite |
| Name | Cosmos 1891 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 18403 | 31531 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 23 02:58 | 2024 Dec 16 21:07 |
| Time of closest approach (UTC) | 2024 Dec 26 01:11:42.505 |
| Minimum distance | 4.990 km |
| Height difference | -4.987 km |
| Relative speed | 14.346 km/s |
| Angle between velocity vectors | 155° |
| Geographic position | 81.5°N, 145.3°W |
| Height | 954 km |
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