| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | FENGYUN 1C DEB |
| Spacetrack catalog number | 15333 | 30673 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 25 18:28 | 2021 Jan 25 20:42 |
| Time of closest approach (UTC) | 2020 Nov 30 17:18:39.886 |
| Minimum distance | 85.607 km |
| Height difference | -2.763 km |
| Relative speed | 6.242 km/s |
| Angle between velocity vectors | 50° |
| Geographic position | 54.2°S, 152.9°W |
| Height | 879 km |
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