| Primary satellite | Secondary satellite |
| Name | deb Delta 139 | COSMOS 2251 DEB |
| Spacetrack catalog number | 13561 | 34634 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 12:50 | 2024 Dec 22 09:47 |
| Time of closest approach (UTC) | 2024 Dec 26 07:44:52.074 |
| Minimum distance | 3.074 km |
| Height difference | -0.335 km |
| Relative speed | 13.954 km/s |
| Angle between velocity vectors | 136° |
| Geographic position | 73.7°N, 154.9°W |
| Height | 726 km |
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