| Primary satellite | Secondary satellite |
| Name | Envisat | IRIDIUM 33 DEB |
| Spacetrack catalog number | 27386 | 39781 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 16 14:23 | 2021 Apr 15 13:11 |
| Time of closest approach (UTC) | 2021 Mar 06 10:27:58.618 |
| Minimum distance | 59.040 km |
| Height difference | -8.474 km |
| Relative speed | 14.881 km/s |
| Angle between velocity vectors | 165° |
| Geographic position | 73.0°S, 104.3°W |
| Height | 791 km |
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