| Primary satellite | Secondary satellite |
| Name | KKS-1 | COSMOS 2251 DEB |
| Spacetrack catalog number | 33499 | 34759 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2021 Mar 06 12:56 | 2021 Mar 06 05:29 |
| Time of closest approach (UTC) | 2021 Jan 18 02:53:33.570 |
| Minimum distance | 104.279 km |
| Height difference | 4.471 km |
| Relative speed | 14.473 km/s |
| Angle between velocity vectors | 148° |
| Geographic position | 69.8°S, 119.7°W |
| Height | 668 km |
|