| Primary satellite | Secondary satellite |
| Name | Cosmos 1891 Rocket | SL-16 R/B |
| Spacetrack catalog number | 18403 | 27006 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 23 02:58 | 2024 Dec 23 01:20 |
| Time of closest approach (UTC) | 2024 Dec 27 06:02:27.060 |
| Minimum distance | 3.678 km |
| Height difference | -2.003 km |
| Relative speed | 6.660 km/s |
| Angle between velocity vectors | 54° |
| Geographic position | 71.3°S, 5.5°W |
| Height | 1027 km |
|