| Primary satellite | Secondary satellite |
| Name | Tiros 1 | ESTCUBE 1 |
| Spacetrack catalog number | 29 | 39161 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2025 Jun 19 16:08 | 2025 Jun 20 02:18 |
| Time of closest approach (UTC) | 2025 May 21 13:18:47.158 |
| Minimum distance | 53.212 km |
| Height difference | 6.801 km |
| Relative speed | 12.834 km/s |
| Angle between velocity vectors | 117° |
| Geographic position | 46.5°N, 116.8°E |
| Height | 638 km |
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