| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | COSMOS 1818 COOLANT |
| Spacetrack catalog number | 35959 | 50787 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 15:36 | 2024 Dec 19 13:38 |
| Time of closest approach (UTC) | 2024 Dec 26 10:34:00.177 |
| Minimum distance | 1.723 km |
| Height difference | 1.704 km |
| Relative speed | 3.576 km/s |
| Angle between velocity vectors | 28° |
| Geographic position | 61.9°N, 128.9°E |
| Height | 785 km |
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