| Primary satellite | Secondary satellite |
| Name | Cosmos 407 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 5175 | 35718 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Feb 24 18:47 | 2021 Feb 24 16:36 |
| Time of closest approach (UTC) | 2021 Jan 19 05:45:40.868 |
| Minimum distance | 37.537 km |
| Height difference | -2.463 km |
| Relative speed | 6.890 km/s |
| Angle between velocity vectors | 55° |
| Geographic position | 72.0°S, 9.7°W |
| Height | 781 km |
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