| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | deb Kosmos-839 |
| Spacetrack catalog number | 34459 | 18606 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 23 09:30 | 2024 Dec 22 18:41 |
| Time of closest approach (UTC) | 2024 Dec 24 18:25:42.899 |
| Minimum distance | 2.029 km |
| Height difference | 1.416 km |
| Relative speed | 4.089 km/s |
| Angle between velocity vectors | 32° |
| Geographic position | 64.5°N, 170.0°E |
| Height | 996 km |
|