| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 31094 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 10 02:44 | 2021 Apr 09 23:51 |
| Time of closest approach (UTC) | 2021 Mar 04 18:18:42.896 |
| Minimum distance | 16.093 km |
| Height difference | -5.251 km |
| Relative speed | 14.806 km/s |
| Angle between velocity vectors | 167° |
| Geographic position | 37.8°N, 69.5°E |
| Height | 852 km |
|