| Primary satellite | Secondary satellite |
| Name | Cosmos 1656 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15755 | 37904 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Mar 08 14:42 | 2021 Mar 07 18:07 |
| Time of closest approach (UTC) | 2021 Jan 26 18:50:59.018 |
| Minimum distance | 55.184 km |
| Height difference | 0.754 km |
| Relative speed | 11.530 km/s |
| Angle between velocity vectors | 102° |
| Geographic position | 70.5°N, 128.3°E |
| Height | 830 km |
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