| Primary satellite | Secondary satellite |
| Name | ESTCUBE 1 | COSMOS 2251 DEB |
| Spacetrack catalog number | 39161 | 35000 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2023 May 28 04:45 | 2023 May 27 06:56 |
| Time of closest approach (UTC) | 2023 Apr 03 14:33:30.844 |
| Minimum distance | 547.578 km |
| Height difference | 7.486 km |
| Relative speed | 14.837 km/s |
| Angle between velocity vectors | 160° |
| Geographic position | 75.3°S, 93.6°W |
| Height | 670 km |
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