| Primary satellite | Secondary satellite |
| Name | Envisat | Prospero Rocket |
| Spacetrack catalog number | 27386 | 5581 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2025 Nov 17 20:47 | 2025 Nov 17 19:39 |
| Time of closest approach (UTC) | 2025 Oct 14 13:27:54.670 |
| Minimum distance | 248.387 km |
| Height difference | -9.539 km |
| Relative speed | 7.639 km/s |
| Angle between velocity vectors | 61° |
| Geographic position | 72.9°S, 166.2°E |
| Height | 788 km |
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