| Primary satellite | Secondary satellite |
| Name | Cosmos 1766 | FLOCK 4V 26 |
| Spacetrack catalog number | 16881 | 46825 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Jan 26 10:57 | 2021 Jan 26 04:23 |
| Time of closest approach (UTC) | 2020 Dec 01 07:45:28.955 |
| Minimum distance | 4.598 km |
| Height difference | 4.571 km |
| Relative speed | 15.203 km/s |
| Angle between velocity vectors | 179° |
| Geographic position | 82.4°N, 117.7°E |
| Height | 536 km |
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