| Primary satellite | Secondary satellite |
| Name | Cosmos 1766 | OBJECT F |
| Spacetrack catalog number | 16881 | 43836 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Jan 26 10:57 | 2021 Jan 26 05:43 |
| Time of closest approach (UTC) | 2020 Nov 29 06:49:07.670 |
| Minimum distance | 7.029 km |
| Height difference | 0.528 km |
| Relative speed | 15.198 km/s |
| Angle between velocity vectors | 180° |
| Geographic position | 17.7°N, 124.4°W |
| Height | 534 km |
|