| Primary satellite | Secondary satellite |
| Name | Cosmos 1726 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 16496 | 35443 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Mar 06 17:01 | 2021 Mar 06 05:53 |
| Time of closest approach (UTC) | 2021 Jan 27 15:15:34.501 |
| Minimum distance | 27.032 km |
| Height difference | 3.179 km |
| Relative speed | 13.744 km/s |
| Angle between velocity vectors | 130° |
| Geographic position | 60.5°S, 49.3°E |
| Height | 650 km |
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