| Primary satellite | Secondary satellite |
| Name | Cosmos 1726 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 16496 | 34292 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Mar 06 17:01 | 2021 Mar 06 08:53 |
| Time of closest approach (UTC) | 2021 Jan 22 01:58:29.765 |
| Minimum distance | 121.685 km |
| Height difference | -4.460 km |
| Relative speed | 4.292 km/s |
| Angle between velocity vectors | 33° |
| Geographic position | 71.3°N, 136.7°W |
| Height | 622 km |
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