| 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 21:24:04.217 |
| Minimum distance | 5.989 km |
| Height difference | -2.243 km |
| Relative speed | 14.933 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 59.9°S, 60.5°E |
| Height | 785 km |
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