| Primary satellite | Secondary satellite |
| Name | UNK | COSMOS 2251 DEB |
| Spacetrack catalog number | 28479 | 37320 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 23 03:02 | 2024 Dec 20 07:33 |
| Time of closest approach (UTC) | 2024 Dec 24 20:00:40.878 |
| Minimum distance | 4.143 km |
| Height difference | 4.119 km |
| Relative speed | 14.965 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 2.5°S, 25.0°W |
| Height | 688 km |
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