| Primary satellite | Secondary satellite |
| Name | KKS-1 | COSMOS 2251 DEB |
| Spacetrack catalog number | 33499 | 34787 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2021 Mar 07 21:29 | 2021 Mar 07 15:59 |
| Time of closest approach (UTC) | 2021 Jan 17 15:40:36.209 |
| Minimum distance | 8.493 km |
| Height difference | 2.574 km |
| Relative speed | 14.678 km/s |
| Angle between velocity vectors | 155° |
| Geographic position | 68.3°S, 87.0°W |
| Height | 672 km |
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