| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | CZ-4 DEB |
| Spacetrack catalog number | 11511 | 28074 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 20 12:05 | 2021 Jan 20 03:52 |
| Time of closest approach (UTC) | 2020 Dec 07 21:46:38.476 |
| Minimum distance | 3.586 km |
| Height difference | -1.615 km |
| Relative speed | 14.715 km/s |
| Angle between velocity vectors | 162° |
| Geographic position | 63.9°S, 61.9°E |
| Height | 801 km |
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