| Primary satellite | Secondary satellite |
| Name | Cosmos 2251 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 22676 | 34756 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 12:10 | 2021 Jan 17 01:45 |
| Time of closest approach (UTC) | 2020 Nov 26 22:59:11.338 |
| Minimum distance | 61.776 km |
| Height difference | 1.811 km |
| Relative speed | 14.366 km/s |
| Angle between velocity vectors | 145° |
| Geographic position | 24.1°N, 4.3°W |
| Height | 781 km |
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