| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 29963 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 24 13:36 | 2021 Jan 24 09:57 |
| Time of closest approach (UTC) | 2020 Dec 03 09:20:18.987 |
| Minimum distance | 39.862 km |
| Height difference | 3.762 km |
| Relative speed | 14.749 km/s |
| Angle between velocity vectors | 166° |
| Geographic position | 41.6°N, 87.5°W |
| Height | 844 km |
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