| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | deb Explorer IX |
| Spacetrack catalog number | 35703 | 85 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 20 19:48 | 2024 Dec 22 10:54 |
| Time of closest approach (UTC) | 2024 Dec 24 10:20:51.682 |
| Minimum distance | 4.082 km |
| Height difference | 4.052 km |
| Relative speed | 4.802 km/s |
| Angle between velocity vectors | 37° |
| Geographic position | 13.3°N, 46.4°W |
| Height | 574 km |
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