| Primary satellite | Secondary satellite |
| Name | Cosmos 1891 Rocket | SL-16 Debris |
| Spacetrack catalog number | 18403 | 26075 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 23 02:58 | 2024 Dec 22 20:27 |
| Time of closest approach (UTC) | 2024 Dec 25 14:37:18.511 |
| Minimum distance | 1.691 km |
| Height difference | -0.230 km |
| Relative speed | 7.369 km/s |
| Angle between velocity vectors | 60° |
| Geographic position | 70.9°N, 89.0°W |
| Height | 946 km |
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