| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | SL-16 Debris |
| Spacetrack catalog number | 11511 | 25863 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 12:51 | 2021 Jan 16 14:31 |
| Time of closest approach (UTC) | 2020 Dec 03 05:42:53.860 |
| Minimum distance | 19.335 km |
| Height difference | -5.435 km |
| Relative speed | 13.519 km/s |
| Angle between velocity vectors | 131° |
| Geographic position | 74.0°S, 106.0°W |
| Height | 807 km |
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