| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | DMSP 5D-2 F11 DEB |
| Spacetrack catalog number | 11511 | 28343 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 12:51 | 2021 Jan 15 09:02 |
| Time of closest approach (UTC) | 2020 Dec 01 08:34:16.375 |
| Minimum distance | 22.581 km |
| Height difference | 1.214 km |
| Relative speed | 14.333 km/s |
| Angle between velocity vectors | 148° |
| Geographic position | 72.2°S, 163.6°W |
| Height | 806 km |
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