| Primary satellite | Secondary satellite |
| Name | deb Delta 139 | COSMOS 2251 DEB |
| Spacetrack catalog number | 12172 | 33782 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 00:38 | 2024 Dec 22 14:37 |
| Time of closest approach (UTC) | 2024 Dec 26 12:32:19.118 |
| Minimum distance | 1.258 km |
| Height difference | 0.821 km |
| Relative speed | 14.896 km/s |
| Angle between velocity vectors | 170° |
| Geographic position | 43.0°N, 87.5°E |
| Height | 777 km |
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