| Primary satellite | Secondary satellite |
| Name | Cosmos 1656 | CZ-2C R/B |
| Spacetrack catalog number | 15755 | 31114 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Mar 07 20:07 | 2021 Mar 08 04:05 |
| Time of closest approach (UTC) | 2021 Jan 22 11:46:32.318 |
| Minimum distance | 27.918 km |
| Height difference | 5.274 km |
| Relative speed | 12.608 km/s |
| Angle between velocity vectors | 116° |
| Geographic position | 71.2°N, 97.9°W |
| Height | 831 km |
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