| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 38720 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 10 02:44 | 2021 Apr 10 13:57 |
| Time of closest approach (UTC) | 2021 Mar 05 07:10:29.002 |
| Minimum distance | 126.023 km |
| Height difference | -6.902 km |
| Relative speed | 7.423 km/s |
| Angle between velocity vectors | 60° |
| Geographic position | 61.0°S, 77.6°E |
| Height | 859 km |
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