| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 29858 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 11:40 | 2021 Jan 24 23:31 |
| Time of closest approach (UTC) | 2020 Nov 29 16:04:35.761 |
| Minimum distance | 76.731 km |
| Height difference | -4.431 km |
| Relative speed | 14.427 km/s |
| Angle between velocity vectors | 151° |
| Geographic position | 64.5°S, 25.3°W |
| Height | 882 km |
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