| Primary satellite | Secondary satellite |
| Name | AO-Echo | COSMOS 2251 DEB |
| Spacetrack catalog number | 28375 | 34971 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Oct 02 10:37 | 2024 Oct 02 14:05 |
| Time of closest approach (UTC) | 2024 Sep 25 19:57:53.306 |
| Minimum distance | 1.829 km |
| Height difference | -1.696 km |
| Relative speed | 14.924 km/s |
| Angle between velocity vectors | 167° |
| Geographic position | 54.3°S, 78.5°E |
| Height | 719 km |
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