| Primary satellite | Secondary satellite |
| Name | Envisat | COSMOS 1275 DEB |
| Spacetrack catalog number | 27386 | 42111 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Dec 13 14:56 | 2025 Dec 11 04:58 |
| Time of closest approach (UTC) | 2025 Nov 15 23:04:28.371 |
| Minimum distance | 8.107 km |
| Height difference | -2.459 km |
| Relative speed | 14.933 km/s |
| Angle between velocity vectors | 177° |
| Geographic position | 60.8°S, 34.8°E |
| Height | 785 km |
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