| Primary satellite | Secondary satellite |
| Name | Cosmos 1766 | FENGYUN 1C DEB |
| Spacetrack catalog number | 16881 | 35153 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 26 10:57 | 2021 Jan 25 11:34 |
| Time of closest approach (UTC) | 2020 Dec 03 01:34:35.290 |
| Minimum distance | 6.634 km |
| Height difference | 4.951 km |
| Relative speed | 15.241 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 21.8°S, 47.8°W |
| Height | 549 km |
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