| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 32133 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 10 02:44 | 2021 Apr 09 10:26 |
| Time of closest approach (UTC) | 2021 Mar 09 12:46:12.631 |
| Minimum distance | 7.342 km |
| Height difference | -2.815 km |
| Relative speed | 3.594 km/s |
| Angle between velocity vectors | 28° |
| Geographic position | 10.4°S, 53.8°W |
| Height | 854 km |
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