| Primary satellite | Secondary satellite |
| Name | ESTCUBE 1 | deb Kosmos-858 |
| Spacetrack catalog number | 39161 | 18504 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2023 May 31 22:21 | 2023 Jun 01 01:06 |
| Time of closest approach (UTC) | 2023 Apr 04 21:28:06.359 |
| Minimum distance | 188.521 km |
| Height difference | 1.886 km |
| Relative speed | 14.830 km/s |
| Angle between velocity vectors | 161° |
| Geographic position | 67.0°S, 175.4°E |
| Height | 667 km |
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