| Primary satellite | Secondary satellite |
| Name | ESTCUBE 1 | COSMOS 2251 DEB |
| Spacetrack catalog number | 39161 | 34815 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2023 Feb 07 03:44 | 2023 Feb 06 21:12 |
| Time of closest approach (UTC) | 2022 Dec 05 15:35:54.829 |
| Minimum distance | 42.503 km |
| Height difference | 0.365 km |
| Relative speed | 14.843 km/s |
| Angle between velocity vectors | 160° |
| Geographic position | 62.3°S, 119.2°E |
| Height | 670 km |
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