| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 30326 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 18:28 | 2021 Jan 25 17:17 |
| Time of closest approach (UTC) | 2020 Nov 28 21:49:25.783 |
| Minimum distance | 397.098 km |
| Height difference | 7.087 km |
| Relative speed | 3.693 km/s |
| Angle between velocity vectors | 29° |
| Geographic position | 16.1°N, 57.6°W |
| Height | 841 km |
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