| Primary satellite | Secondary satellite |
| Name | ERS-2 | FLOCK 4P 11 |
| Spacetrack catalog number | 23560 | 44809 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 22 12:30 | 2021 Apr 22 11:33 |
| Time of closest approach (UTC) | 2021 Mar 05 00:15:49.291 |
| Minimum distance | 712.186 km |
| Height difference | -1.509 km |
| Relative speed | 13.739 km/s |
| Angle between velocity vectors | 129° |
| Geographic position | 77.1°N, 46.6°W |
| Height | 509 km |
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