| Primary satellite | Secondary satellite |
| Name | Envisat | FENGYUN 1C DEB |
| Spacetrack catalog number | 27386 | 30613 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 16 14:23 | 2021 Apr 16 03:59 |
| Time of closest approach (UTC) | 2021 Mar 07 12:23:32.785 |
| Minimum distance | 137.987 km |
| Height difference | 2.916 km |
| Relative speed | 9.281 km/s |
| Angle between velocity vectors | 77° |
| Geographic position | 79.9°N, 21.5°E |
| Height | 779 km |
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