| Primary satellite | Secondary satellite |
| Name | Cosmos 1766 | FENGYUN 1C DEB |
| Spacetrack catalog number | 16881 | 30926 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 26 10:57 | 2021 Jan 26 13:44 |
| Time of closest approach (UTC) | 2020 Dec 03 02:41:01.604 |
| Minimum distance | 129.367 km |
| Height difference | 7.054 km |
| Relative speed | 14.752 km/s |
| Angle between velocity vectors | 150° |
| Geographic position | 82.1°N, 138.7°W |
| Height | 536 km |
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