| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | deb Agena D |
| Spacetrack catalog number | 11511 | 4856 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 20 12:05 | 2021 Jan 19 13:50 |
| Time of closest approach (UTC) | 2020 Dec 04 02:36:07.287 |
| Minimum distance | 16.530 km |
| Height difference | 0.658 km |
| Relative speed | 12.893 km/s |
| Angle between velocity vectors | 118° |
| Geographic position | 73.9°N, 116.9°E |
| Height | 770 km |
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