| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | Spot 4 Rocket |
| Spacetrack catalog number | 11511 | 25261 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Jan 20 12:05 | 2021 Jan 20 02:57 |
| Time of closest approach (UTC) | 2020 Dec 07 21:45:47.447 |
| Minimum distance | 5.862 km |
| Height difference | -0.668 km |
| Relative speed | 14.657 km/s |
| Angle between velocity vectors | 159° |
| Geographic position | 66.2°S, 57.5°E |
| Height | 803 km |
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