| Primary satellite | Secondary satellite |
| Name | Cosmos 1656 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15755 | 32177 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Mar 07 20:07 | 2021 Mar 07 22:14 |
| Time of closest approach (UTC) | 2021 Jan 24 09:35:52.005 |
| Minimum distance | 12.356 km |
| Height difference | 2.934 km |
| Relative speed | 14.773 km/s |
| Angle between velocity vectors | 165° |
| Geographic position | 46.5°N, 1.0°W |
| Height | 811 km |
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