| Primary satellite | Secondary satellite |
| Name | ESTCUBE 1 | COSMOS 2251 DEB |
| Spacetrack catalog number | 39161 | 35668 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2025 Jan 19 04:13 | 2025 Jan 18 00:40 |
| Time of closest approach (UTC) | 2024 Dec 11 08:23:59.341 |
| Minimum distance | 46.424 km |
| Height difference | -1.819 km |
| Relative speed | 14.742 km/s |
| Angle between velocity vectors | 155° |
| Geographic position | 68.5°N, 41.2°E |
| Height | 647 km |
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