| Primary satellite | Secondary satellite |
| Name | Cosmos 773 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 8344 | 40792 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 11 22:20 | 2021 Apr 10 02:17 |
| Time of closest approach (UTC) | 2021 Mar 06 02:31:52.438 |
| Minimum distance | 2.309 km |
| Height difference | 1.670 km |
| Relative speed | 4.936 km/s |
| Angle between velocity vectors | 39° |
| Geographic position | 73.2°N, 11.1°E |
| Height | 759 km |
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