| Primary satellite | Secondary satellite |
| Name | Cosmos 44 | ESTCUBE 1 |
| Spacetrack catalog number | 876 | 39161 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2023 Sep 28 13:44 | 2023 Sep 28 18:33 |
| Time of closest approach (UTC) | 2023 Jun 04 20:27:02.633 |
| Minimum distance | 1089.160 km |
| Height difference | -22.340 km |
| Relative speed | 13.560 km/s |
| Angle between velocity vectors | 129° |
| Geographic position | 58.6°S, 26.3°E |
| Height | 690 km |
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